CN116466474B

CN116466474B - Focusing lens module, focusing method and electronic equipment

Info

Publication number: CN116466474B
Application number: CN202310725184.7A
Authority: CN
Inventors: 祖嘉琦; 王新权
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2023-06-19
Filing date: 2023-06-19
Publication date: 2024-05-17
Anticipated expiration: 2043-06-19
Also published as: CN116466474A

Abstract

The present application discloses a focusing lens module, a focusing method and an electronic device, and relates to the field of optical imaging technology. The module includes: a reflection component, a lens group and an image sensor. Among them, the lens group is arranged on the incident light path of the reflection component, and/or the lens group is arranged on the reflected light path of the reflection component, and the image sensor receives the outgoing light of the lens group or the reflected light of the reflection component to achieve imaging. The reflection component includes a shape adjustment member and a reflection member, the reflection member is arranged on the shape adjustment member, and the side of the reflection member away from the shape adjustment member has a reflection surface. The shape adjustment member controls the deformation of the reflection member to change the surface shape of the reflection surface so that the outgoing light of the lens group or the reflected light of the reflection component is focused on the image sensor. The surface parameters of the reflection surface include a radius of curvature and a correction parameter, and the correction parameter is used to correct the aberration of the reflected light of the reflection surface imaging on the image sensor.

Description

Focusing lens module, focusing method and electronic equipment

Technical Field

The present application relates to the field of optical imaging technologies, and in particular, to a focusing lens module, a focusing method, and an electronic device.

Background

In the existing intelligent equipment, in order to obtain clear image effects at different object distances, the distance between a lens and a photosensitive chip is generally adjusted to realize focusing at different object distances. For example, an Automatic Focus (AF) lens is used in the existing device, and a Voice Coil Motor (VCM) is required to drive the lens to move integrally during focusing. In this way, the requirement is made on the axial dimensions of the camera module or of the electronic device, the space required is large and the stability is poor.

Disclosure of Invention

The application provides a focusing lens module, a focusing method and electronic equipment. The size of the focusing lens module can be effectively reduced without the aid of a motor or the position of the lens group, and the focusing lens module has higher stability and focusing range. The focusing method can adjust the surface shape of the reflecting surface according to the object distance of the shot object, so that the object in the far and near scene can be shot by adopting the focusing lens module to finish good focusing, and a clear image is obtained.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical scheme:

In a first aspect, the present application provides a focusing lens module, the module comprising: a reflective assembly, a lens assembly, and an image sensor. The lens group is arranged on the incident light path of the reflecting component, and/or the lens group is arranged on the reflecting light path of the reflecting component, and the image sensor receives the emergent light of the lens group or the reflecting light of the reflecting component so as to realize imaging.

The reflecting component comprises a shape adjusting piece and a reflecting piece, the reflecting piece is arranged on the shape adjusting piece, and one side of the reflecting piece, which is away from the shape adjusting piece, is provided with a reflecting surface. The shape adjusting piece controls the reflecting piece to deform so as to change the surface shape of the reflecting surface, so that emergent rays of the lens group or reflected rays of the reflecting component are focused on the image sensor.

The surface type parameters of the reflecting surface include a radius of curvature and correction parameters for correcting aberrations of the reflected light of the reflecting surface imaged on the image sensor.

Therefore, by arranging the reflecting component and the lens group, the transmission path of light rays can be changed by the reflecting component and the lens group, so that the purpose of focusing on the image surface of the image sensor is realized. The lens group can be arranged on the incident light path of the reflecting component, can be arranged on the emergent light path of the reflecting component, and can be divided into two groups, wherein one group is arranged on the incident light path of the reflecting component, and the other group is arranged on the emergent light path of the reflecting component.

In the application, the shape of the reflecting component can be adjusted to change the surface shape of the reflecting surface so as to adjust the transmission path of light, focusing is realized only by changing the surface shape of the reflecting surface when shooting objects with different object distances, a lens group does not need to be moved, a motor for driving the lens group to move is not required, part parts can be omitted, a space for the lens group to move is not required, and the size of the focusing lens module can be effectively reduced.

When the surface type of the reflecting surface is adjusted, the curvature radius of the reflecting surface is not simply adjusted, and meanwhile, the correction parameters of the reflecting surface are required to be adjusted, so that the focusing purpose can be achieved by changing the curvature radius of the reflecting surface. By adjusting the correction parameters of the reflecting surface, the optical path of the light reaching the image surface after passing through the reflecting surface can be adjusted, and the aberration of the reflected light imaging after passing through the reflecting surface can be adjusted. Therefore, in the application, the surface shape of the reflecting surface is influenced by the two parameters of the curvature radius and the correction parameter, and the light rays processed by the reflecting component and the lens group can be focused on the image surface of the image sensor by adjusting the two parameters, so that the image is clearly formed.

In one possible design of the first aspect, the surface shape of the reflecting surface is a free-form surface or an extended odd-order aspheric surface.

The design method shows two specific surface types of the reflecting surface, and in addition, a person skilled in the art can select other surface types to perform focusing adjustment according to practical application, so long as the technical effect of the surface type exemplified by the application can be met, and the application is not limited to the specific shape of the surface type.

In one possible design of the first aspect, when the surface shape of the reflecting surface is a free-form surface, the following relation is satisfied:

；

Wherein Z is the sagittal height of the aspheric surface, C is the radius of curvature, r is the radial coordinate of the aspheric surface, k is the conic coefficient, N is the free-form surface term number, C _j is the coefficient, x, y is the coordinate value, and α, b is the integer.

In one possible embodiment of the first aspect, the reflector is a reflective film layer applied to the shape-adjusting member, or the reflector is a mirror. The design gives a specific arrangement of the reflecting elements, wherein the form of the reflecting elements can be specifically selected according to the type of the whole reflecting assembly.

In one possible embodiment of the first aspect, the shape-adjusting element is a plurality of piezo-electric actuators or a plurality of discrete electrodes.

In one possible design manner of the first aspect, the lens group is disposed on a reflected light path of the reflection assembly, and the lens group includes first to fifth lenses sequentially disposed from an object side to an image side along the optical axis.

In this design, a specific arrangement form is given for the arrangement positions and the number of the lens groups, that is, the lens groups are arranged on the reflection light path of the reflection assembly, and five lenses are arranged. Further, the number and positions of the lens groups may be set according to actual needs, for example, the number of the lens groups may be four to six.

In a possible design manner of the first aspect, the lens group further includes a filter disposed between the fifth lens and the image sensor.

In one possible design of the first aspect, the first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, the fourth lens has positive optical power, and the fifth lens has negative optical power.

In one possible design manner of the first aspect, the lens group includes a first lens group and a second lens group, the first lens group is disposed on an incident light path of the reflection assembly, and the second lens group is disposed on a reflected light path of the reflection assembly.

In one possible design manner of the first aspect, the number of lenses in the first lens group is 1, and the number of lenses in the second lens group is 3 to 5.

In one possible design of the first aspect, the number of lenses in the first lens group is 1 and the number of lenses in the second lens group is 4.

In a second aspect, the present application provides a focusing method applied to the focusing lens module provided by the first aspect and any one of possible design manners thereof, where the method includes:

The method comprises the steps of obtaining the object distance of a shot object and the initial surface shape of a reflecting surface, wherein the initial surface shape is the surface shape of the reflecting surface before the object distance of the shot object is obtained. And judging whether the object distance is matched with the initial surface type, and if the object distance is matched with the initial surface type, keeping the surface type of the reflecting surface to be the initial surface type. And if the object distance is not matched with the initial surface shape, adjusting the surface shape of the reflecting surface to be the surface shape corresponding to the object distance.

In this way, by acquiring the object distance of the object to be photographed and the initial surface shape of the reflecting surface, it is possible to determine whether the object distance of the object to be photographed matches the initial surface shape, and if so, it is described that photographing with the initial surface shape can form good focusing, and it is only necessary to maintain the initial surface shape without adjusting the surface shape of the reflecting surface. If the images are not matched, the condition that good focusing cannot be formed by shooting with the initial surface type is indicated, the surface type of the reflecting surface needs to be adjusted to be the surface type corresponding to the object distance of the shot object, so that the object at the object distance can be shot to form good focusing, and a clear image can be obtained.

In one possible design manner of the second aspect, determining whether the object distance and the initial surface shape match includes:

And acquiring an initial object distance corresponding to the initial surface shape, and if the object distance is equal to the initial object distance, keeping the surface shape of the reflecting surface to be the initial surface shape. If the object distance is not equal to the initial object distance, the surface shape of the reflecting surface is adjusted to be the surface shape corresponding to the object distance.

The design mode provides a specific method for judging whether the object distance is matched with the initial surface shape.

In one possible design manner of the second aspect, the object distance corresponding surface shape includes: when the object distance is greater than or equal to 50m, the surface shape of the reflecting surface is a plane. When the object distance is greater than or equal to 10m and less than 50m, the object distance corresponds to one plane shape per 1m interval. For example, when the object distance is 10 to 11m, the surface shape is different from that corresponding to the object distance of 11 to 12 m. When the object distance is more than or equal to 3m and less than 10m, the object distance corresponds to one surface type at intervals of 0.1 m. For example, when the object distance is 3 to 3.1m, the surface shape is different from that when the object distance is 3.1 to 3.2 m. When the object distance is greater than or equal to 1m and less than 3m, the object distance corresponds to one surface type every 0.01 m. For example, when the object distance is 1.01 to 1.02m, the surface shape is different from that when the object distance is 1.02 to 1.03 m. When the object distance is greater than or equal to 0.15m and less than 1m, the object distance corresponds to one surface shape per 0.005m interval. For example, the object distance is 0.155 to 0.16m, which is different from the surface shape corresponding to the object distance of 0.16 to 0.165 m.

In a third aspect, the present application provides an electronic device comprising: the housing and the focusing lens module provided in the first aspect and any one of the possible designs thereof, the camera module is mounted on the housing.

It may be appreciated that the advantages achieved by the electronic device provided in the third aspect may refer to the advantages as in the first aspect and any of the possible design manners thereof, which are not described herein.

Drawings

Fig. 1 is a schematic perspective view of an electronic device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a focusing lens module according to an embodiment of the present application;

Fig. 3 is a schematic structural diagram of a reflection assembly in a focusing lens module according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a reflective assembly in another focus lens module according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a focusing lens module according to an embodiment of the present application;

Fig. 6 is a schematic structural diagram of another focusing lens module according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a focusing lens module according to another embodiment of the present application;

fig. 8 is a schematic focusing diagram of a focusing lens module according to an embodiment of the present application under different shooting distances;

FIG. 9 is a schematic view of a surface of a reflector in a focus lens module according to an embodiment of the present application;

Fig. 10 is a schematic structural diagram of a lens assembly according to an embodiment of the present application;

FIG. 11 is a graph showing on-axis chromatic aberration of a lens assembly focusing at an object distance of 50m and above according to an embodiment of the present application;

FIG. 12 is a graph showing astigmatic curves of a lens assembly focusing at an object distance of 50m and above according to an embodiment of the present application;

FIG. 13 is a graph showing distortion of a lens assembly according to an embodiment of the present application when focusing at an object distance of 50m or more;

FIG. 14 is a graph showing an on-axis chromatic aberration of a lens assembly focusing at an object distance of 1m or less according to an embodiment of the present application;

FIG. 15 is a graph showing astigmatic curves of a lens assembly focusing at an object distance of 1m or less according to an embodiment of the present application;

FIG. 16 is a graph showing distortion of a lens assembly according to an embodiment of the present application when focusing at an object distance of 1m or less;

Fig. 17 is a flowchart of a focusing method according to an embodiment of the present application.

100-An electronic device; 10-screen; 20-a back shell; 21-a back cover; 22-frame; 30-focusing a lens module;

310-a reflective component; 311-shape adjusting member; 312-a reflector; 313-reflecting surface; 320-lens group; 321-a first lens group; 322-a second lens group; 330-image sensor.

Detailed Description

The technical scheme of the application will be described below with reference to the accompanying drawings.

In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In embodiments of the application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

It is to be understood that the terminology used in the description of the various examples described herein is for the purpose of describing particular examples only and is not intended to be limiting. As used in the description of the various described examples, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

In the present application, "at least one" means one, two or more, and "a plurality" means two or more. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural.

It will also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. The term "and/or" is an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

It should also be understood that in the present application, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, e.g., the term "connected" may be a fixed connection, a sliding connection, a removable connection, an integral body, etc.; can be directly connected or indirectly connected through an intermediate medium.

It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It should be appreciated that reference throughout this specification to "one embodiment," "another embodiment," "one possible design" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment of the application" or "in another embodiment of the application" or "one possible design approach" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

It should also be understood that in the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In some of the drawings, the plurality of lenses may be represented by the same drawing, but it is not limited that the plurality of lenses all have the same size or parameter. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.

In the embodiment of the present application, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens near the object side becomes the object side of the lens, and the surface of each lens near the image side is called the image side of the lens. The determination of the surface shape in the paraxial region can be performed by a determination method by a person skilled in the art by positive or negative determination of the concave-convex with R value (R means the radius of curvature of the paraxial region, and generally means the R value on a lens database (lens data) in optical software). In the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the image side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.

For ease of understanding, the technical terms involved in the present application are explained and described first.

An Optical axis (Optical axis), which is the direction of the light transmitted by the Optical system, refers to the principal ray of the central field of view. For symmetrical transmission systems, it is common to coincide with the optical system rotation centerline. For off-axis and reflective systems, the optical axis will also appear as a fold line.

When light rays parallel to the optical axis enter the convex lens, the ideal convex lens is a point where all the light rays are converged behind the lens, and the point where all the light rays are converged is the focal point.

Focal length (focal length), also known as focal length, is a measure of the concentration or divergence of light in an optical system, and refers to the distance from the optical center of a lens or lens group to the focal point when a scene at infinity is brought into clear images at the focal plane by the lens or lens group, and can also be understood as the perpendicular distance from the optical center of the lens or lens group to the focal plane. The distance from the center of the lens to the imaging plane can be understood from a practical point of view. For a fixed focus lens, the position of the optical center of the fixed focus lens is fixed, so that the focal length is fixed; for a zoom lens, a change in the optical center of the lens brings about a change in the focal length of the lens, and thus the focal length can be adjusted.

Aberration (aberration), also known as axial chromatic aberration, longitudinal chromatic aberration, or positional chromatic aberration, or axial aberration, is a phenomenon in which a bundle of rays parallel to the optical axis, after passing through a lens, converge at different positions in front and back. This is because the lens images light of each wavelength at different positions, so that the focal planes of the light of different colors at the time of final imaging cannot coincide, and the light of multiple colors is scattered to form dispersion.

Spherical (sphere) and aspherical (ASPHERICAL SURFACE) surfaces are used mainly for lens geometry of lenses (various cameras, microscopes, etc.), spectacles (including contact lenses), i.e. spherical and aspherical lenses. The difference in geometry determines the difference in refraction direction of the parallel incident light, thereby affecting the imaging effect.

The spherical lens (SPHERICAL LENS) has a spherical radian and an arc-shaped cross section. When light rays with different wavelengths are incident on different positions on the lens in parallel with the optical axis, the light rays cannot be focused into a point on a film plane (a plane perpendicular to the line between the center of the lens and the focal point of the lens and passing through the focal point), so that the problem of aberration is formed, and the quality of an image is affected, for example, phenomena such as reduced definition and deformation occur.

The spherical lens (ASPHERICAL LENS) is not in spherical radian, but the edge part of the lens is cut a little, and the cross section of the lens is in a plane shape. When the light is incident on the aspherical mirror, the light can be focused on a point, namely, a film plane, so as to eliminate various aberrations.

Taking a lens as a boundary, wherein the side where a shot object is positioned is an object side, and the surface of the lens close to the object side can be called an object side; the side of the lens, on which the image of the object is located, is the image side, and the surface of the lens near the image side may be referred to as the image side.

Positive focal power, meaning that the lens has a positive focal length and has the effect of converging light; negative focal power indicates that the lens has a negative focal length and has the effect of diverging light.

Axial chromatic aberration (axial colour aberration), also known as longitudinal chromatic aberration or positional chromatic aberration or axial chromatic aberration, a bundle of rays parallel to the optical axis, after passing through the lens, converges at different positions back and forth, this aberration being known as positional chromatic aberration or axial chromatic aberration. This is because the lens images light of each wavelength at different positions, so that the focal planes of the light of different colors at the time of final imaging cannot coincide, and the light of multiple colors is scattered to form dispersion.

Lateral chromatic aberration (lateral chromatic abatement), also known as chromatic aberration of magnification, is the difference in magnification of the optical system for different colors of light. The wavelength causes a change in the magnification of the optical system, with a change in the size of the image.

Distortion (distortion), also known as distortion, is the degree of distortion of an image of an object by an optical system relative to the object itself. The distortion is caused by the influence of the spherical aberration of the diaphragm, and the height of the intersection point of the chief rays with different fields of view and the Gaussian image plane after passing through the optical system is not equal to the ideal height, and the difference between the chief rays and the Gaussian image plane is the distortion. Therefore, the distortion only changes the imaging position of the off-axis object point on the ideal plane, so that the shape of the image is distorted, but the definition of the image is not affected.

Optical distortion (optical distortion) refers to the degree of distortion calculated in optical theory.

Object distance (distance) of the object from the optical center of the lens. In the embodiment of the application, the long distance can be more than 50m of object distance, and the micro distance is less than 1m of object distance.

Focal length (focal length), which is a measure of the concentration or divergence of light in an optical system, refers to the distance from the optical center of a lens to the focal point of light concentration when parallel light is incident, and is mostly denoted by f.

In the existing intelligent devices, for example, electronic devices such as mobile phones and tablet computers, an automatic focusing technology is adopted, so that the lens continuously moves along the optical axis direction. For example, existing devices use periscope Autofocus (AF) lenses, and in the focusing process, a Voice Coil Motor (VCM) is required to drive the lens to move integrally. In this way, there is a requirement for the axial dimension of the camera module or the electronic device, the space required to be occupied is large, it is difficult to realize the miniaturization design of the camera module or the electronic device, and the stability is poor.

In order to solve the above problems, an embodiment of the present application provides a focus lens module, which is applied to an electronic device. The focusing lens module adjusts the shape of the reflecting piece by arranging the reflecting component with the shape adjusting piece and the reflecting piece, and adjusts the surface shape of the reflecting surface by utilizing the shape adjusting piece, thereby realizing the simultaneous change of the curvature radius and the correction parameter of the reflecting surface on the reflecting piece. Focusing can be achieved by changing the radius of curvature of the reflecting surface, and the aberration of reflected light imaging through the reflecting surface can be adjusted by adjusting the correction parameters of the reflecting surface. That is, the focusing function is realized by adjusting the curvature radius and the correction parameter of the reflecting surface of the reflecting component at the same time, so that the automatic focusing of the far and near scenes is realized, and the shooting is clear. Because the reflecting piece in the focusing lens module is arranged on the shape adjusting piece, the focusing lens module directly realizes focusing by changing the curvature radius and the correction parameter of the reflecting surface, therefore, the focusing lens module does not need to reserve a space for a lens or a lens group to displace, does not need to arrange driving pieces such as a voice coil motor and the like, and is beneficial to realizing the miniaturization design of the focusing lens module.

Since the focusing lens module in the embodiment of the present application is applied to an electronic device, for convenience of understanding, the embodiment of the present application will be described in detail with reference to the accompanying drawings, and before describing the embodiment of the present application, an application scenario of the present application, that is, an electronic device to which the focusing lens module is applicable will be described briefly.

The present application provides an electronic device, which may be a portable electronic device or other suitable electronic device. For example, the electronic device may be a cell phone, a tablet computer (tablet personal computer), a laptop computer (lap computer), a Personal Digital Assistant (PDA), a camera, a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, augmented reality (augmented reality) glasses, AR helmets, virtual Reality (VR) glasses, VR helmets, or the like.

Referring to fig. 1, fig. 1 is a schematic perspective view of an electronic device according to an embodiment of the application. In this embodiment, the electronic device 100 is a mobile phone. The electronic apparatus 100 includes a screen 10, a back case 20, a rear focus lens module 30, a flash module, a main board, a battery, and the like.

It is to be understood that fig. 1 only schematically illustrates some components included in the electronic device 100, and the actual shape, actual size, actual position, and actual configuration of these components are not limited by fig. 1. In other examples, electronic device 100 may not include screen 10.

The screen 10 is used to display images, videos, and the like. The screen 10 includes a light-transmitting substrate and a display screen (english name: panel, also referred to as display panel). The light-transmitting substrate and the display screen are stacked. The light-transmitting substrate is mainly used for protecting and preventing dust of the display screen. The material of the transparent substrate includes, but is not limited to, glass. The display screen can be a flexible display screen or a rigid display screen. For example, the display screen may be an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode (AMOLED) display screen, a mini-led (mini organic light-emitting diode) display screen, a micro-led (micro organic light-emitting diode) display screen, a micro-organic light-emitting diode (micro organic light-emitting diode) display screen, a quantum dot LIGHT EMITTING diodes (QLED) display screen, a liquid crystal display (liquid CRYSTAL DISPLAY, LCD).

The back shell 20 is used to protect the internal electronics of the electronic device 100. The back case 20 includes a back cover 21 and a rim 22. The back cover 21 is located at one side of the display screen far away from the transparent substrate, and is stacked with the transparent substrate and the display screen. The frame 22 is located between the back cover 21 and the light-transmitting substrate. The back cover 21 is fixed on the frame 22, and the back cover 21 may be fixedly connected to the frame 22 by an adhesive, or the back cover 21 and the frame 22 may be integrally formed, i.e. the back cover 21 and the frame 22 are integrally formed. The light-transmitting substrate is fixed to the frame 22 by gluing. The light-transmitting substrate, the back cover 21 and the frame 22 enclose an internal accommodating space of the electronic device 100. The internal accommodation space accommodates the display screen, the focus lens module 30, the flash module, the main board, and the battery.

The battery is used for supplying power to the display screen and the circuit board, and the focusing lens module 30 is connected to the circuit board. In some embodiments, the focusing lens module 30 may be used to perform functions of a rear camera, for example, a user may perform close-up, long-range shooting, or video recording through the focusing lens module 30. In other embodiments, the focus lens module 30 may be used to perform the function of a front camera, i.e. a user may perform operations such as self-timer, video call, etc. through the focus lens module 30. The present application is described with respect to a focusing lens module 30 of a smart phone, but it is understood that the focusing lens module 30 disclosed in the present application is applicable to other types of terminal devices 10.

The structure of the focus lens module 30 in the embodiment of the present application will be described in detail with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a focusing lens module according to an embodiment of the application. As shown in fig. 2, the focusing lens module 30 includes a reflecting component 310, a lens group 320 and an image sensor 330, the reflecting component 310 can change the light path of the light and can converge or diverge the light, the lens group 320 is mainly used for converging the light, and by adjusting the positions of the reflecting component 310 and the lens group 320, the incident light entering the focusing lens module 30 can be focused on the image surface of the image sensor 330, so as to realize clear imaging.

In the embodiment of the present application, the reflecting element 310 is a deformable reflecting element 310, and the deformable reflecting element 310 refers to that the shape of the reflecting surface 313 of the reflecting element 310 can be controlled to change the curvature radius and the correction parameters of the reflecting surface 313, so as to change the transmission path of the light reflected by the reflecting surface 313. The focal length of the focusing lens module 30 can be adjusted by adjusting the radius of curvature of the reflecting surface 313 to achieve focusing. By changing the correction parameters of the reflecting surface 313, the aberration of the reflected light reflected by the reflecting surface 313 can be adjusted. The aberration (total chromatic aberration, aberration) refers to a deviation from the ideal state of gaussian optics (first order approximation theory or paraxial rays) in an actual optical system, in which the result obtained by non-paraxial ray tracing does not coincide with the result obtained by paraxial ray tracing. Aberrations are mainly classified into spherical aberration, coma, curvature of field, astigmatism, distortion, chromatic aberration, wave aberration, and the like. By adjusting the aberration of the reflected light reflected by the reflecting surface 313, the imaging of the reflected light on the image plane can be made clearer.

It should be noted that, in the embodiment of the present application, when adjusting the shape of the reflecting surface 313 on the reflecting component 310, the radius of curvature of the reflecting surface 313 and the correction parameter need to be adjusted simultaneously. In the case of adjusting only the radius of curvature, although the focal distance can be adjusted, imaging on the image plane is not clear. This is because only the radius of curvature is adjusted, the focal length of the focus lens module 30 is changed, and the transmission path of the light is changed, affecting the aberration of the light. Therefore, it is necessary to further change the shape of the reflection surface 313 on the basis of changing the radius of curvature of the reflection surface 313. On the basis of adjusting the curvature radius of the reflecting surface 313, the correction parameters of the reflecting surface 313 are adjusted, so that the light reflected by the reflecting surface 313 can be focused on the image surface finally, and the imaging on the image surface is clear.

Specifically, the reflecting component 310 in the embodiment of the present application includes a shape adjusting member 311 and a reflecting member 312, where the reflecting member 312 is disposed on the shape adjusting member 311, and a side of the reflecting member 312 facing away from the shape adjusting member 311 has a reflecting surface 313. The shape adjusting member 311 may change the shape of the reflecting member 312, thereby changing the shape of the reflecting surface 313 on the reflecting member 312. In general, the shape adjuster 311 may be energized, and the magnitude of the voltage or the frequency of the current input to the shape adjuster 311 may be controlled to control the movement of the shape adjuster 311, thereby effectively controlling the radius of curvature and the correction parameters of the reflecting surface 313.

The structure of the reflection assembly 310 in the embodiment of the present application will be described.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a reflection assembly 310 in a focus lens module according to an embodiment of the application. As shown in fig. 3, the reflecting element 310 is a piezo-electric deformable mirror. The reflective assembly 310 includes a deformable mirror, piezoelectric drivers, and a substrate on which a plurality of piezoelectric drivers are disposed, with a certain interval between two adjacent piezoelectric drivers, forming a piezoelectric driver array. Wherein the deformable mirror is a reflector 312, and the piezoelectric actuator array is a shape adjuster 311.

One end of the piezoelectric driver is connected with a wire which is used for supplying power to the piezoelectric driver so as to control the movement of the piezoelectric driver. The deformable mirror is connected to the other end of the piezoelectric actuator, and the deformable mirror is connected to each of the piezoelectric actuators so as to precisely control the shape of the deformable mirror by the plurality of piezoelectric actuators. The greater the number of piezo-electric actuators provided on the substrate, the more accurate the adjustment of the shape of the deformable mirror.

Among them, the deformable mirror is generally made of glass, quartz, silicon, or the like, and is mirror-plated with metal on a side of the deformable mirror away from the piezoelectric actuator, which side crystal plane is referred to as a reflecting surface 313. The deformable mirror and the piezoelectric actuator may be fixed by an adhesive. By varying the voltage combinations of the piezoelectric driver arrays, different deformations of the mirror surface can be produced.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a reflection assembly 310 in another focusing lens module according to an embodiment of the present application. Wherein (a) in fig. 4 shows the overall structure of the reflection assembly 310, and (b) in fig. 4 shows the structure of the control electrode in the reflection assembly 310. As shown in fig. 4 (a), the reflecting element 310 is a thin film deformable mirror. The reflection assembly 310 comprises a frame, a transparent electrode, a thin film mirror, a control electrode and a control circuit, wherein the edge of the thin film mirror is fixed on the frame, the control electrode is arranged below the thin film mirror, the control electrode is connected with the control circuit, and the transparent electrode is arranged above the thin film mirror. The thin film mirror generally adopts a metal thin film as a mirror surface material, and a reflecting surface 313 is arranged on one side of the thin film mirror far away from the control electrode, so that incident light can pass through the transparent electrode to reach the reflecting surface 313 of the thin film mirror, and reflection is generated on the reflecting surface 313. The thin film mirror is a reflecting piece 312, the control electrode is a shape adjusting piece 311, the control electrode comprises a plurality of discrete electrodes, and the power on of each discrete electrode can be independently adjusted. As shown in fig. 4 (b), the more discrete electrodes are arranged in the control electrode, the more accurate the deformation control of the thin film mirror is.

Thin film mirrors generally have a multilayer structure mainly including a dielectric layer (DIELECTIC STACK), a metal layer (metal), a Silicon nitride layer (Silicon nitride), and the like. The thickness is generally 0.5-10 microns and the diameter is 5-50 mm.

When a control voltage is applied to the control electrode below the thin film mirror, electrostatic attraction (eletrostatic attraction) is generated between the control electrode and the thin film mirror, so that the thin film mirror is deformed, the shape of the reflecting surface 313 is changed, and the curvature radius and correction parameters of the reflecting surface 313 are adjusted. According to the quantitative relation between the control voltage and the deformation of the control electrode, the high-precision control of the deformation of the mirror surface can be realized.

If the same voltage is applied across all control electrodes, the thin film mirror will deform spherically (spherical recess). By applying different voltages (i.e., different combinations of voltages) to different control electrodes, the thin film mirror can be deformed differently, which is advantageous for adjusting the reflective surface 313 to a desired shape.

In addition, since only attractive force exists between the control electrode and the thin film mirror and repulsive force cannot be generated, the thin film mirror can only deform (i.e., deform concavely) towards the control electrode, and cannot deform convexly.

In the practical use process, in order to make the film mirror generate bidirectional deformation (concave-convex energy), usually, a bias voltage is applied to the deformable mirror during the light path calibration to make the deformable mirror generate bias deformation, so that the deformable mirror can generate concave-convex deformation based on the bias voltage.

It can be appreciated that the reflective component 310 in the embodiment of the present application can control the input voltage or current after being energized, and adjust the shape of the reflective surface 313 of the reflective component 310 to adjust the curvature radius and the correction parameters of the reflective surface 313. The piezoelectric deformable mirror and the thin film deformable mirror described in the above embodiments are two specific forms of the reflecting member 310.

Since the focus lens module 30 is different in focal length and correction parameters to be adjusted when photographing objects of different distances. In the embodiment of the present application, the shape of the reflecting element 312 in the reflecting component 310 is adjusted to realize automatic focusing in the near-far scene, so that the photographing of the focusing lens module 30 in the near-far scene is clear.

When the object is at a large distance, the reflecting surface 313 in the reflecting component 310 may be a plane without adjusting the focal length. Referring to fig. 2, at this time, the light reflected by the reflection assembly 310 and focused by the lens group 320 has a focusing position on the image plane, and is clearly imaged, so that a distant object can be clearly photographed.

It should be noted that the above embodiments mainly describe the main working principles and structures of the piezoelectric deformable mirror and the thin film deformable mirror, and the detailed structures thereof may refer to related technologies in the prior art.

When the reflection unit 310 and the lens group 320 are disposed, the lens group 320 may be disposed on the incident light path of the reflection unit 310, or the lens group 320 may be disposed on the reflected light path of the reflection unit 310. The embodiment of the application will be described for different setting positions.

Referring to fig. 5to fig. 7, fig. 5 is a schematic structural diagram of a focusing lens module according to an embodiment of the application. As shown in fig. 5, the lens group 320 may be disposed on a reflection light path of the reflection assembly 310, and the image sensor 330 is disposed on an exit light path of the lens group 320. The lens group 320 converges the light reflected by the reflecting component 310, and the image sensor 330 receives the outgoing light of the lens group 320 to realize imaging.

Fig. 6 is a schematic structural diagram of another focusing lens module according to an embodiment of the present application, as shown in fig. 6, a lens group 320 may be disposed on an incident light path of a reflection assembly 310, and an image sensor 330 is disposed on a reflection light path of the reflection assembly 310. The lens group 320 converges the incident light entering the focusing lens module 30, the reflection assembly 310 reflects the converged light by the lens group 320, and the image sensor 330 receives the reflected light of the reflection assembly 310 to realize imaging.

Fig. 7 is a schematic structural diagram of a focusing lens module according to another embodiment of the present application, as shown in fig. 7, the lens assembly 320 includes a first lens assembly 321 and a second lens assembly 322, wherein the first lens assembly 321 is disposed on an incident light path of the reflecting assembly 310, and the second lens assembly 322 is disposed on a reflected light path of the reflecting assembly 310. The image sensor 330 is disposed on the outgoing light path of the second lens group 322. The first lens group 321 can converge or diverge the incident light entering the focusing lens module 30, and the reflection assembly 310 reflects the emergent light of the first lens group 321 to adjust the transmission path. The light reflected by the reflection assembly 310 enters the second lens group 322, and the second lens group 322 converges the reflected light of the reflection assembly 310, so that the light can be focused on the image plane of the image sensor 330, and the image sensor 330 receives the emergent light of the second lens group 322 for imaging.

In the embodiment of the present application, a plurality of lenses are generally disposed in the lens group 320, and the combination of the plurality of lenses is beneficial to adjusting the transmission path of the light to a required position, so as to achieve convergence of the light. Referring to fig. 5 and 6, if the lens group 320 is entirely disposed on the outgoing light path of the reflection assembly 310 or the lens group 320 is entirely disposed on the incoming light path of the reflection assembly 310, all lenses in the lens group 320 are located at one side of the reflection assembly 310. Specifically, the number of lenses in the lens group 320 may be set to four to six. The specific number of lenses in the lens group 320 may be determined according to actual requirements, and is not limited in the embodiment of the present application.

In addition, when the lens group 320 includes the first lens group 321 and the second lens group 322, the first lens group 321 and the second lens group 322 are respectively located at both sides of the reflection assembly 310. Referring to fig. 7, the first lens group 321 is disposed on the incident light path of the reflection assembly 310, and the second lens group 322 is disposed on the reflected light path of the reflection assembly 310. The number of lenses in the first lens group 321 may be set to 1 and the number of lenses in the second lens group 322 may be set to 3-5. So that the sum of the number of lenses in the first lens group 321 and the second lens group 322 is 4 to 6. Of course, a greater number of lenses may be disposed in the first lens group 321 and the second lens group 322, and the number of lens groups 320 is not limited in the embodiment of the present application.

In fig. 5 to 7, the parameters of each lens in the lens group 320 may be the same or different, and the shape of each lens is merely illustrated in the figure, and the parameters and the shape of each lens are not limited to be the same.

Referring to fig. 8, fig. 8 is a schematic focusing diagram of a focusing lens module according to an embodiment of the present application under different shooting distances. In fig. 8, the lens group 320 is disposed on the reflection path of the reflection assembly 310, and the image sensor 330 is disposed on the exit path of the lens group 320. In fig. 8 (a) is a schematic focusing diagram of the focusing lens module 30 when shooting a remote object, as shown in fig. 8 (a), when the focusing lens module 30 in the embodiment of the application is used to shoot a remote object (including a person or an object), the reflecting surface 313 of the reflecting element 312 in the reflecting element 310 can be adjusted to be a plane, and at this time, the light reflected by the reflecting element 312 and adjusted by the lens group 320 is just focused on the image surface of the image sensor 330. That is, a distant object photographed by the focus lens module 30 shown in (a) of fig. 8 is clear.

Fig. 8 (b) is a schematic focusing diagram of a macro object photographed before the adjustment of the focusing lens module 30, and fig. 8 (b) is different from fig. 8 (a) in that: fig. 8 (b) illustrates an object in a macro state, and fig. 8 (a) illustrates an object in a macro state. Wherein, before adjustment, means: when shooting is continued with the focus lens module 30 shown in fig. 8 (a) without changing any parameters, a focusing diagram of the object with a small distance is shown in fig. 8 (b) when shooting with the focus lens module 30 shown in fig. 8 (a). As can be seen from fig. 8 (b), the light reflected by the reflecting member 312 and adjusted by the lens group 320 is not focused on the image plane of the image sensor 330, and its focus is located behind the image plane (the side of the image plane away from the lens group 320/reflecting surface 313). Therefore, imaging of the photographed object is unclear in this case.

Referring to fig. 8 (c), fig. 8 (c) is a focusing schematic diagram of the shooting macro object after the adjustment of the focusing lens module 30. The difference between (c) in fig. 8 and (b) in fig. 8 is that: the reflecting member 312 shown in fig. 8 (c) is a reflecting member 312 adapted to photograph an object in a macro state, and the reflecting member 312 shown in fig. 8 (b) is a reflecting member 312 adapted to photograph an object in a remote state.

Since the macro object is photographed by using the focus lens module 30 of fig. 8 (b), its imaging effect is poor and unclear. Therefore, the reflector 312 in the focus lens module 30 is adjusted. Specifically, the shape adjusting member 311 in the reflecting assembly 310 can be controlled to move to drive the reflecting member 312 to deform, so as to adjust the surface shape of the reflecting surface 313 to adjust the radius of curvature and the correction parameters of the reflecting surface 313, and to focus the light from the object on the image surface. By adjusting the radius of curvature of the reflection surface 313, the transmission path of light can be changed, and by adjusting the surface shape of the reflection surface 313, the correction parameters of the reflection surface 313 can be adjusted, thereby adjusting the aberration of reflected light imaging of the reflection surface 313. As shown in fig. 8 (c), by adjusting the focusing lens module 30, when the adjusted focusing lens module 30 is used for shooting under the macro condition, light from an object can be focused on an image plane, so that clear shooting of the macro object is realized.

Fig. 9 may be referred to for the plane type change of the reflecting element 312 in the reflecting element 310 in fig. 8 (c), and fig. 9 is a schematic plane type diagram of the reflecting element 312 in the focusing lens module according to the embodiment of the present application, where the reflecting element 312 is used for shooting an object in a macro state. As shown in fig. 9, the curvature radius and the surface shape of the reflecting surface 313 are adjusted by changing the shape of the reflecting member 312 (it can be seen from fig. 9 that the reflecting member 312 exhibits different depressions and protrusions), so that the light from the object in the macro state, after being adjusted by the reflecting surface 313 and the lens group 320 on the reflecting member 312, can be focused on the image surface, thereby realizing clear photographing.

In an embodiment of the present application, the surface shape of the reflecting element 312 in the reflecting element 310 may be a free-form surface or an extended odd-order aspheric surface, where the surface shape of the reflecting surface 313 on the reflecting element 312 is a free-form surface or an extended odd-order aspheric surface.

Free-form surfaces refer to surfaces whose surface shape cannot be continuously processed and which have the arbitrary characteristics of conventional processing and molding.

In an embodiment of the present application, when the reflecting surface 313 is of the free-form surface type, the following free-form surface type formula may be used for defining the reflecting surface.

；

It should be understood that the free-form surface of the reflecting surface 313 on the reflecting element 312 in the focusing lens module 30 may be a free-form surface as shown in the above formula, or may be another free-form surface formula, which is not limited in the embodiment of the present application.

TABLE 1

TABLE 2

Wherein, table 1 and table 2 are design parameters provided in the embodiment of the present application, C0 to C20 in table 2 are coefficients of graphs at different object distances, and the number of terms of free-form surfaces is 21. It should be noted that more free-form surface terms may be set, and each term is correspondingly provided with a coefficient, which is only exemplary in the embodiment of the present application, and the specific free-form surface terms and coefficients are not limited.

In an embodiment of the present application, referring to fig. 10, fig. 10 is a schematic structural diagram of a lens assembly 320 according to an embodiment of the present application. As shown in fig. 10, the lens group 320 includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a stop. The first lens E1 has positive power, and a surface S1 of the first lens near the incident side is a convex surface, and a surface S2 of the first lens near the exit side is a convex surface. The second lens E2 has negative focal power, a surface S3 of the second lens close to the incident side is a concave surface, and a surface S4 of the second lens close to the emergent side is a concave surface.

The third lens E3 has negative power, a surface S5 of the third lens near the incident side is a convex surface, and a surface S6 of the third lens near the exit side is a concave surface.

The fourth lens E4 has positive power, a surface S7 of the fourth lens adjacent to the incident side is concave, and a surface S8 of the fourth lens adjacent to the exit side is convex.

The fifth lens E5 has negative power, a surface S9 of the fifth lens near the incident side is concave, and a surface S10 of the fourth lens near the exit side is concave.

The filter E6 has a surface S11 near the incident side and a surface S12 near the exit side. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

In an embodiment of the present application, the total effective focal length f of the lens group 320 is 14.45mm, and the maximum half field angle FOV of the lens group 320 is 10.5 °. The optical imaging lens group 320 has an Fno (Fno is focal length/entrance aperture or effective aperture) of 3.5.

By reasonably distributing the optical power of each lens, it is beneficial to balance the aberration generated by the lens group 320 and increase the imaging quality of the lens group 320. By limiting the maximum field angle of the optical imaging lens group 320 to be within a reasonable range, the optical system is advantageously provided with a better ability to balance chromatic aberration and distortion, and is advantageously improved in imaging quality.

Table 3 shows a basic structural parameter table for a lens group 320 in an embodiment of the present application, wherein the radius of curvature, thickness/distance, and focal length are each in millimeters (mm), the refractive index and abbe number are lens materials that characterize the lenses, and the thickness characterizes the distance between lenses and the lens thickness.

TABLE 3 Table 3

Table 4 shows the higher order coefficients A0-A8 for each of the aspherical mirror surfaces S1-S10 that can be used in the examples of the present application.

TABLE 4 Table 4

In an embodiment of the present application, the object side surface and the image side surface of any one of the first lens element E1 to the fifth lens element E5 are aspheric, and the surface shape of each aspheric lens element can be defined by, but not limited to, the following aspheric formula:

；

wherein X is the sagittal height of the aspheric surface, r is the radial coordinate of the aspheric surface, c is the curvature of the aspheric apex sphere, wherein the radius of curvature is the inverse of the curvature, K is the conic coefficient, Is an aspherical coefficient (A0-A8 in a corresponding table), rm is the maximum value of radial radius coordinates,。

Referring to fig. 11-13, fig. 11 is a graph showing on-axis chromatic aberration of a lens assembly 320 at an object distance of 50m and above, which indicates a converging focus deviation of light rays of different wavelengths after passing through the optical imaging lens assembly 320. Fig. 12 is an astigmatic curve diagram of a lens assembly 320 according to an embodiment of the present application, which shows meridional image surface curvature and sagittal image surface curvature when focusing at an object distance of 50m and above. Fig. 13 is a graph showing distortion values corresponding to different angles of view of a lens assembly 320 according to an embodiment of the present application when focusing at an object distance of 50m or more.

As can be seen from fig. 11 to 13, the lens assembly 320 according to the embodiment of the application can achieve good imaging quality.

Referring to fig. 14-16, fig. 14 is a graph of on-axis chromatic aberration of a lens assembly 320 at an object distance of 1m and below, which illustrates the deviation of converging focal points of light rays of different wavelengths after passing through the optical imaging lens assembly 320, according to an embodiment of the present application. Fig. 15 is an astigmatic curve diagram of a lens assembly 320 according to an embodiment of the present application, which shows meridional image surface curvature and sagittal image surface curvature when focusing at an object distance of 1m or less. Fig. 16 is a graph showing distortion values corresponding to different angles of view of a lens assembly 320 according to an embodiment of the present application when focusing at an object distance of 1m or less.

As can be seen from fig. 14 to 16, it can be seen that good imaging quality can be maintained even after refocusing at different distances.

In an embodiment of the present application, a focusing method is also provided. Referring to fig. 17, fig. 17 is a flowchart of a focusing method according to an embodiment of the present application. As shown in fig. 17, specifically, when shooting is performed, first, the object distance of the shot object is detected by a detection module in the electronic device, and the object distance of the shot object is obtained; and acquires the initial surface shape of the reflecting surface 313 in the focus lens module 30 at this time. Before the object distance of the photographed object is acquired, the surface shape of the reflecting surface 313 in the focus lens module 30 is an initial surface shape. That is, before photographing, the parameters of each component in the focus lens module 30 are initial parameters, and the surface shape of the reflection surface 313 is an initial surface shape. The initial parameters and the initial surface shape mentioned above refer to parameters and surface shapes corresponding to the focus lens module 30 before a certain photographing. The initial parameters and the initial surface shape are the same for each shooting, and the initial parameters and the initial surface shape corresponding to each shooting are not necessarily the same when shooting is performed for a plurality of times.

By acquiring the object distance of the object to be photographed and the initial surface shape of the reflection surface 313 before photographing, it is possible to determine whether the object to be photographed at the object distance can obtain a clear image by using the focus lens module 30 of the current parameter (the surface shape of the reflection surface 313 is the initial surface shape) to determine whether the object distance and the initial surface shape are matched, and further determine whether focusing is required.

And judging whether the object distance is matched with the initial surface type, namely judging whether refocusing is needed according to the object distance and the initial surface type. If the object distance is matched with the initial surface shape, the surface shape of the reflecting surface 313 is kept to be the initial surface shape, and focusing can be realized; if the object distance does not match the initial surface shape, the imaging is performed using the reflection surface 313 of the initial surface shape, and focusing cannot be performed, and it is necessary to adjust the surface shape of the reflection surface 313 to a surface shape corresponding to the object distance to achieve focusing.

Before each photographing, it is necessary to determine whether the parameters (initial parameters/initial surface types) of the focus lens module 30 in the current state can be brought into clear focus when used for the photographing. Since the parameters of the focus lens module 30 (mainly, the parameters of the reflecting surface 313 on the reflecting member 312) correspond to the object distance of the photographed object. Therefore, according to the initial surface type (the parameter before acquiring the object distance of the object) of the focusing lens module 30, the initial object distance corresponding to the initial surface type can be obtained, and the object distance of the object to be shot is compared with the initial object distance corresponding to the initial surface type, so as to determine whether the acquired object distance is matched with the initial surface type.

If the object distance of the photographed object is equal to the initial object distance corresponding to the initial surface type, it is indicated that the object distance of the photographed object is required to be matched with the initial surface type, and the focusing lens module 30 in the current state is directly adopted to photograph the photographed object at the object distance, so that good focusing can be formed, and therefore, the parameter of the focusing lens module 30 does not need to be adjusted. The focus lens module 30 is kept in the current state, and the surface shape of the reflection surface 313 in the reflection unit 310 is kept, so that focusing and shooting are performed.

If the object distance of the object to be photographed is not equal to the initial object distance corresponding to the initial surface type, it is indicated that the object distance of the object to be photographed is not matched with the initial surface type, and the focusing lens module 30 in the current state is directly adopted to photograph the object to be photographed at the object distance, so that good focusing cannot be formed. Therefore, the parameters of the focusing lens module 30 need to be adjusted, so that refocusing can be performed when capturing an object at the acquired object distance. Specifically, the parameters of the focusing lens module 30 need to be adjusted to parameters corresponding to the acquired object distance according to the acquired object distance, so that when the adjusted focusing lens module 30 shoots a shot object at the acquired object distance, good focusing can be formed again, and further clear shooting is realized.

It should be noted that, in the embodiment of the present application, the equality may be the complete equality in the index value, or may be that both values are in the same range, for example, all object distances in the range 10 to 11 (including 10 but not including 11) correspond to the same plane shape of the reflecting surface 313, so that all the numbers in the range may be considered to be equal, for example, the object distance may be considered to be 10.1 equal to the initial object distance 10, and the object distance may be considered to be 10.2 equal to the initial object distance 10.9. For another example, all object distances in the range 3 to 3.1 (including 3 but not including 3.1) correspond to the same surface shape of the reflecting surface 313, and thus all numbers in the range can be considered to be equal, for example, an initial object distance of 3 is considered to be equal to an object distance of 3.09, and an object distance of 3.02 is considered to be equal to an initial object distance of 3.04.

Wherein, the parameters corresponding to the object distance are as follows: when photographing objects at different object distances, the surface shape of the reflecting surface 313 needs to be adjusted according to the object distances, and the different object distances correspond to different surface shape parameters. The reflecting component 310 can adjust the shape of the reflecting element 312 according to the surface type parameter corresponding to the object distance, so as to adjust the surface type of the reflecting surface 313 on the reflecting element 312, and adjust the curvature radius and the correction parameter of the reflecting surface 313, so that the light reflected by the reflecting surface 313 under the curvature radius and the surface type can be focused on the image surface. I.e. different object distances correspond to different surface forms of the reflecting surface 313.

In the embodiment of the present application, different surface type parameters may be set according to the distance between the object and the object, that is, different surface type parameters corresponding to different distances may be converted into voltage parameters in the reflection assembly 310, so as to control the deformation of the reflection member 312. For example, when the reflective element 310 is a piezo deformable mirror, the surface type parameter may be converted into a control voltage of the piezo actuator, and the deformation of the deformable lens is controlled by controlling the motion state of the piezo actuator. When the reflection component 310 is a thin film deformable mirror, the surface type parameter can be converted into a control voltage of the control electrode, and the magnitude of the control voltage is changed to change the electrostatic attraction between the control electrode and the thin film mirror, so that the deformation of the thin film mirror is controlled.

Specifically, when the object distance is detected to be within the first range: when the object distance is greater than or equal to 50m, it can be considered that the object distance is in a remote state, and the surface type parameter corresponding to the distance can be set as the surface type parameter a, and when the shape adjusting member 311 in the reflecting assembly 310 adjusts the reflecting member 312 according to the surface type parameter a, the reflecting member 312 at this time is a planar reflecting member 312, that is, the reflecting surface 313 of the reflecting member 312 is a plane. That is, when the focusing lens module 30 provided by the embodiment of the present application is used for photographing, when the object distance is detected to be greater than or equal to 50m, the reflection surface 313 of the reflection member 312 is adjusted to be a plane, so that clear photographing can be achieved.

When the object distance is detected to be within the second range: when the object distance is greater than or equal to 10m and less than 50m, the surface type parameter corresponding to the distance can be set as the surface type parameter B. Because the span range of the object distance is large, when the object distance is 10m and the object distance is 49m, if the same plane type parameter B is adopted for shooting, the acquired image may be unclear. Therefore, it is necessary to set the corresponding profile parameter B more accurately for different object distances. In order to avoid that the set surface type parameters B are too many, so that the running speed is slow, in the embodiment of the application, when the object distance is detected to be greater than or equal to 10m and less than 50m, a group of corresponding surface type parameters B are set at intervals of 1 m. I.e. one reflecting surface 313 per 1m of object distance. Specifically, when the object distance is 10m, setting the surface type parameter corresponding to the object distance as a surface type parameter B1; when the object distance is 11m, setting the surface type parameter corresponding to the object distance as a surface type parameter B2; setting a surface type parameter corresponding to the object distance as a surface type parameter B3 … … when the object distance is 12m, and setting the surface type parameter corresponding to the object distance as a surface type parameter B39 when the object distance is 48 m; when the object distance is 49m, the surface type parameter corresponding to the object distance is set as the surface type parameter B40.

When the object distance is detected to be within the third range: when the distance is more than or equal to 3m and less than 10m, the surface type parameter corresponding to the distance can be set as the surface type parameter C. Because the span range of the object distance is large, when the object distance is 3m and the object distance is 9.9m, if the same plane type parameter B is adopted for shooting, the acquired image may be unclear. Therefore, it is necessary to set the corresponding profile parameter C more accurately for different object distances. In order to avoid that the set surface type parameters C are too many, which results in a slow running speed, in the embodiment of the present application, when the object distance is detected to be greater than or equal to 3m and less than 10m, a set of corresponding surface type parameters C are set every 0.1 m. Specifically, when the object distance is 3m, setting the surface type parameter corresponding to the object distance as a surface type parameter C1; when the object distance is 3.1m, setting the surface type parameter corresponding to the object distance as a surface type parameter C2; setting the surface type parameter corresponding to the object distance as a surface type parameter C3 … … when the object distance is 3.2m, and setting the surface type parameter corresponding to the object distance as a surface type parameter C69 when the object distance is 9.8 m; when the object distance is 9.9m, setting the surface type parameter corresponding to the object distance as the surface type parameter C70.

When the object distance is detected to be within the fourth range: when the distance is greater than or equal to 1m and less than 3m, the surface type parameter corresponding to the distance can be set as the surface type parameter D. Because the span range of the object distance is larger, if all object distances in the range are shot by adopting the same plane type parameter B, the acquired image is unclear. Therefore, it is necessary to set the corresponding profile parameter D more accurately for different object distances. In order to avoid that the set surface type parameter D is too much or too little, in the embodiment of the present application, when the object distance is detected to be greater than or equal to 3m and less than 10m, a set of corresponding surface type parameters D are set every 0.01 m. Specifically, when the object distance is 1m, setting the surface type parameter corresponding to the object distance as a surface type parameter D1; when the object distance is 1.01m, setting the surface type parameter corresponding to the object distance as a surface type parameter D2; setting a surface type parameter corresponding to the object distance as a surface type parameter D3 … … when the object distance is 1.03m, and setting the surface type parameter corresponding to the object distance as a surface type parameter D199 when the object distance is 2.98 m; when the object distance is 2.99m, setting the surface type parameter corresponding to the object distance as the surface type parameter D200.

When the object distance is detected to be within the fifth range: when the distance is greater than or equal to 0.15m and less than 1m, the surface type parameter corresponding to the distance can be set as the surface type parameter F. Because the span range of the object distance is larger, if all object distances in the range are shot by adopting the same plane type parameter B, the acquired image is unclear. Therefore, it is necessary to set the corresponding profile parameter F more accurately for different object distances. In order to avoid that the set surface type parameter F is too much or too little, in the embodiment of the present application, when the object distance is detected to be greater than or equal to 0.15m and less than 1m, a set of corresponding surface type parameters F are set every 0.005 m. Specifically, when the object distance is 0.15m, setting the surface type parameter corresponding to the object distance as a surface type parameter F1; when the object distance is 0.155m, setting the surface type parameter corresponding to the object distance as a surface type parameter F2; setting a surface type parameter corresponding to the object distance as a surface type parameter F3 … … when the object distance is 0.16m, and setting the surface type parameter corresponding to the object distance as a surface type parameter F169 when the object distance is 0.99 m; when the object distance is 0.995m, the surface type parameter corresponding to the object distance is set as the surface type parameter F170.

It should be noted that, in the embodiment of the present application, the first range, the second range, the third range, the fourth range, and the fifth range form a continuous object distance interval, and the sizes of the first range, the second range, the third range, the fourth range, and the fifth range are all adjustable, for example, the first range may be: greater than or equal to 40m; the second range may be greater than or equal to 10m and less than 40m. Wherein the spacing density within each range is also adjustable, e.g., the spacing density within the second range can be adjusted from 1m spacing to 0.5m spacing; the spacing density in the third range may be adjusted from spacing 0.1m to spacing 0.05m. That is, the present application is not limited to a specific number of the surface type parameters, and the object distance range corresponding to each surface type parameter is not limited, and can be adjusted according to actual requirements. Of course, the smaller the object distance, the higher the density of the set face type parameters, in other words, the smaller the object distance range corresponding to each set of face type parameters when the object distance is smaller.

In addition, in the embodiment of the present application, the surface type parameter corresponding to each object distance is reflected on the reflecting surface 313 of the reflecting member 312 according to the object distance from large to small or from small to large, and the surface type of the reflecting surface 313 is continuously changed. Specifically, the shape of the reflecting surface 313 on the reflecting member 312 is adjusted in the order of the surface type parameter a, the surface type parameter B40 to the surface type parameter B1, the surface type parameter C70 to the surface type parameter C1, the surface type parameter D200 to the surface type parameter D1, and the surface type parameter F170 to the surface type parameter F1, and the shape change of the reflecting surface 313 is continuous.

It should be noted that the object distance does not refer to a specific value, but may be a range. For example, the object distance L, which in practice may refer to the range: l to L+d (L is inclusive and L+d is not inclusive), wherein d is the space size.

For example, when 10.ltoreq.L < 50, the interval d may be set to 1m. If L is 10m, the range indicated by L can be 10 m-11 m; if L is 11m, the range indicated by L can be 11 m-12 m; if L is 49m, the range indicated by L may be 49m to 50m.

For example, when 3.ltoreq.L < 10, the interval d may be set to 0.1m. If L is 3m, the range indicated by L can be 3 m-3.1 m; if L is 9.9m, the range indicated by L may be 9.9m to 10m.

For example, when 1.ltoreq.L < 3, the interval d may be set to 0.01m. If L is 1m, the range indicated by L can be 1 m-1.01 m; if L is 2.99m, the range indicated by L may be 2.99m to 3m.

In the embodiment of the present application, after the physical parameters of each device in the focusing lens module 30 are determined, the preset surface type parameters of the focusing lens module 30 can be determined according to the specific dimensions thereof. However, because there is a tolerance in processing the optical system in the focus lens module 30, when the focus lens module 30 is applied to an electronic device, the initial surface type parameter of the focus lens module 30 can be adjusted during the application process and the use process so as to adapt to the focus lens module 30 applied to the electronic device. The surface type parameters, the object distances corresponding to the surface type parameters, and the object distance intervals corresponding to the two adjacent surface type parameters described in the above embodiments can be adjusted according to the actually matched lens parameters, chip parameters, and imaging requirements.

For example, when the object distance is detected to be within the first range: if the object distance is 50m or more, the distance defined in the embodiment of the present application is satisfied, and if the object distance is detected as a distance, the reflecting surface 313 on the reflecting member 312 may be theoretically set to be a plane. However, in order to correct the tolerance generated during the processing or installation of the reflecting member 312, in practical application, when the object distance is detected to be a long distance, the reflecting surface 313 on the reflecting member 312 may be set to be not planar, and the tolerance of the reflecting member 312 may be corrected so that the effect generated by the reflecting surface 313 which is not planar is the same as the effect generated by the reflecting surface 313 which is theoretically planar.

In the embodiment of the present application, when the electronic device having the focusing lens module 30 described in the above embodiment is used for photographing, the object distance of the photographed object is first detected by the detection module in the electronic device, and then, according to the detected object distance and the current parameter (the initial surface shape of the reflecting surface 313) of the focusing lens module 30, it is determined whether the surface shape of the reflecting surface 313 needs to be adjusted. If the current focusing lens module 30 is used to capture a subject for focusing, a clear image can be obtained, and the surface shape of the reflecting surface 313 does not need to be adjusted. If the current focusing lens module 30 is used to shoot the shot object, the shot object cannot be focused, and a clear image cannot be obtained, the surface shape of the reflecting surface 313 needs to be adjusted to realize refocusing, so that when shooting the object at the measured object distance, the clear image can be obtained. That is, the focusing method provided in the embodiment of the present application adjusts the parameters of the focusing lens module 30 in real time according to the distance between the object and the lens module, so as to achieve good focusing. If the current parameter of the focusing lens module 30 is exactly matched with the object distance of the object to be photographed, the parameter of the focusing lens module 30 is not required to be adjusted, and good focusing can be achieved.

Before shooting, the parameters corresponding to the components in the focusing lens module 30 are initial parameters, the parameters of the reflecting element 312 are initial surface type parameters, and the initial surface type parameters can be any surface type parameters described above.

For example, before one photographing, the initial surface type parameter of the reflector 312 in the focus lens is the surface type parameter a, and the object distance corresponding to the initial surface type parameter is 50m and above. When the electronic device detects that the object distance of the object to be shot is 50m, the object distance of the object to be shot is equal to or within the same range as the object distance corresponding to the parameter (initial parameter) of the current state of the focusing lens module 30, so that the focusing lens module 30 is kept to be the parameter of the current state, and the object to be shot can be imaged to focus on the image plane, thereby realizing clear shooting of the object to be shot.

When the electronic device detects that the object distance of the object to be photographed is 40m, the object distance (40 m) of the object to be photographed is not equal to the object distance (50 m or more) corresponding to the parameter (initial parameter) of the current state of the focusing lens module 30, so if the camera module corresponding to the parameter of the current state is continuously adopted for photographing, clear imaging cannot be realized, and the parameter in the focusing lens module 30 needs to be adjusted. It should be noted that, in the embodiment of the present application, the adjustment of the parameter in the focus lens module 30 mainly refers to the adjustment of the parameter of the reflecting member 312 in the focus lens module 30 to adjust the parameter of the reflecting surface 313.

Since the object distance of the photographed object is 40m at this time, the parameters of the reflecting member 312 are adjusted according to the object distance of the photographed object, so that the adjusted reflecting member 312 can form good focusing on the image plane when being used for photographing the object at the object distance, thereby realizing clear photographing. Since the object distance is 40m, the surface type parameter corresponding to the reflector 312 is the surface type parameter B31. Therefore, the surface type parameter B31 can be converted into a corresponding voltage parameter, the shape adjusting member 311 in the reflecting assembly 310 is controlled to deform, the reflecting member 312 is driven to deform, and the surface type of the reflecting surface 313 on the reflecting member 312 is adjusted to be the surface type corresponding to the surface type parameter B31, so that the light from the photographed object with the object distance of 40m can be focused on the image surface after being reflected by the reflecting surface 313 of the surface type, and after being processed by other optical assemblies. It should be noted that, the other optical components are a certain amount in the process, and parameters thereof remain unchanged, and the process mainly realizes focusing on the photographed objects at different object distances by adjusting the surface shape of the reflecting surface 313.

When the reflector 312 is adjusted to the surface type corresponding to the surface type parameter B31, the initial parameter of the reflector 312 of the focus lens module 30 is the surface type parameter B31. If it is detected that the object distance of the photographed object is 10m and the object distance of the photographed object is not equal to the object distance (40 m) corresponding to the parameter in the current state of the focusing lens module 30, the parameter of the reflector 312 in the focusing lens module 30 needs to be adjusted to the plane type parameter corresponding to the object distance of the photographed object. Since the object distance is 10m, according to the preset surface type parameter, when the object distance is 10m, the corresponding surface type parameter can be determined to be the surface type parameter B1. Therefore, the surface type parameter B1 can be converted into a corresponding voltage parameter, the shape adjusting member 311 in the reflecting component 310 is controlled to deform, the reflecting member 312 is driven to deform, and the surface type of the reflecting surface 313 on the reflecting member 312 is adjusted to be the surface type corresponding to the surface type parameter B1, so that the light from the photographed object with the object distance of 10m can be focused on the image surface after being reflected by the reflecting surface 313 of the surface type, and after being processed by other optical components.

With reference to the above-described method, when it is detected that the object distance of the photographed object is inconsistent with the object distance corresponding to the parameter (initial parameter) in the current state of the focusing lens module 30, the surface type of the reflecting member 312 in the focusing lens module 30 is adjusted according to the surface type parameter corresponding to the object distance of the photographed object, so that the surface type of the reflecting surface 313 on the reflecting member 312 can meet the requirement of forming focusing when photographing the object with the current object distance, and the imaging is clear. When it is detected that the object distance of the photographed object is consistent with the object distance corresponding to the parameter (initial parameter) of the current state of the focusing lens module 30, the focusing is performed by continuing to use the focusing lens module 30 in the current state, so that a clear image is obtained.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application.

In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the scope of the present application includes the preferred embodiments and all changes and modifications that come within the scope of the embodiments of the present application.

The foregoing has outlined a detailed description of an assembly device according to the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided only to assist in understanding the transmission circuit and core concept of the present application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

The foregoing is merely illustrative of specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The focusing method is characterized by being applied to a focusing lens module, wherein the focusing lens module comprises a reflecting component, a lens group and an image sensor, the lens group is arranged on an incident light path of the reflecting component, and/or the lens group is arranged on a reflecting light path of the reflecting component, and the image sensor receives emergent light rays of the lens group or reflected light rays of the reflecting component so as to realize imaging;

The reflection assembly comprises a shape adjusting piece and a reflection piece, wherein the reflection piece is arranged on the shape adjusting piece, one side, away from the shape adjusting piece, of the reflection piece is provided with a reflection surface, the structure of the shape adjusting piece is honeycomb-shaped, and the method comprises the following steps:

acquiring the object distance of a shot object and the initial surface shape of the reflecting surface, wherein the initial surface shape is the surface shape of the reflecting surface before acquiring the object distance of the shot object;

judging whether the surface type corresponding to the object distance is an initial surface type or not;

if the surface shape corresponding to the object distance is an initial surface shape, keeping the surface shape of the reflecting surface to be the initial surface shape;

if the object distance is not the initial surface shape, the shape adjusting piece controls the reflecting piece to deform so as to adjust the curvature radius of the reflecting surface and correction parameters, so that the emergent light rays of the lens group or the reflected light rays of the reflecting component are focused on the image sensor, and the correction parameters are used for correcting the aberration of the reflected light of the reflecting surface imaged on the image sensor;

The surface shape corresponding to the object distance comprises:

when the object distance is greater than or equal to 50m, the surface shape of the reflecting surface is a plane;

When the object distance is more than or equal to 10m and less than 50m, the object distance corresponds to one surface type at each interval of 1 m;

when the object distance is more than or equal to 3m and less than 10m, the object distance corresponds to one surface type at intervals of 0.1 m;

when the object distance is larger than or equal to 1m and smaller than 3m, the object distance corresponds to one surface type at intervals of 0.01 m;

When the object distance is greater than or equal to 0.15m and less than 1m, the object distance corresponds to one surface type every 0.005 m.

2. The method of claim 1, wherein the reflective surface has a surface shape of a free-form surface or an extended odd-order aspheric surface.

3. The method according to claim 2, wherein when the surface shape of the reflecting surface is a free-form surface, the following relation is satisfied:

4. A method according to any one of claims 1 to 3, wherein the reflective member is a reflective film layer coated on the shape adjustment member.

5. The method of claim 4, wherein the shape adjustment member is a plurality of discrete electrodes.

6. A method according to any one of claims 1 to 3, wherein the lens group is disposed in a reflected light path of the reflection assembly, the lens group comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens disposed in this order from an object side to an image side along an optical axis.

7. The method of claim 6, wherein the lens group further comprises a filter disposed between the fifth lens and the image sensor.

8. The method of claim 6, wherein the first lens has positive optical power, the second lens has negative optical power, the third lens has negative optical power, the fourth lens has positive optical power, and the fifth lens has negative optical power.

9. A method according to any one of claims 1 to 3, wherein the lens group comprises a first lens group disposed in the incident light path of the reflective assembly and a second lens group disposed in the reflected light path of the reflective assembly.

10. The method of claim 9, wherein the number of lenses in the first lens group is 1 and the number of lenses in the second lens group is 3 to 5.

11. The method of claim 10, wherein the number of lenses in the first lens group is 1 and the number of lenses in the second lens group is 4.