CN118707700A - Vehicle-mounted lens and vehicle - Google Patents
Vehicle-mounted lens and vehicle Download PDFInfo
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- CN118707700A CN118707700A CN202410900605.XA CN202410900605A CN118707700A CN 118707700 A CN118707700 A CN 118707700A CN 202410900605 A CN202410900605 A CN 202410900605A CN 118707700 A CN118707700 A CN 118707700A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
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Abstract
The invention provides a vehicle-mounted lens and a vehicle, which are based on the technical field of optical imaging, wherein the vehicle-mounted lens is provided with an object side and an image side which are oppositely arranged along the optical axis direction, and the vehicle-mounted lens comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power and an image plane which are sequentially arranged from the object side to the image side, so that the diameter of the image plane of the vehicle-mounted lens is between 5.0mm and 6.5mm, and the aperture value is between 2.2 and 2.4; the first lens is a spherical lens, and the second lens, the third lens and the fourth lens are plastic aspherical lenses. According to the scheme, four lenses are adopted, the focal power and the shape matching relation of each lens are reasonably set, and the vehicle-mounted lens with light weight, high imaging quality, low cost and low temperature drift is realized.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a vehicle-mounted lens and a vehicle.
Background
With the continuous development of science and technology and the continuous progress of social development, the optical lens has more and more remarkable effect in the field of automobiles and is widely applied to vehicles. At present, the consumer market is towards low-cost and miniaturized trend, but many similar products have more lenses and more complicated structures. Most of the existing lenses with low cost and simple structure cannot be defocused in the environment with large temperature difference, and the size of the angle of view cannot meet the requirements of consumers.
Disclosure of Invention
The invention mainly aims to provide a vehicle-mounted lens and a vehicle, and aims to provide the vehicle-mounted lens which is light in weight, high in imaging quality, low in cost and low in temperature drift.
In order to achieve the above object, the present invention proposes a vehicle-mounted lens having an object side and an image side disposed opposite to each other in an optical axis direction, the vehicle-mounted lens including a first lens having positive optical power, a second lens having negative optical power, a third lens having positive optical power, a fourth lens having negative optical power, and an image plane, which are disposed in order from the object side to the image side, such that an image plane diameter of the vehicle-mounted lens is between 5.0mm and 6.5mm, and an aperture value is between 2.2 and 2.4;
the first lens is a spherical lens, and the second lens, the third lens and the fourth lens are plastic aspherical lenses.
In an embodiment, the vehicle-mounted lens further includes a diaphragm, and the diaphragm is disposed between the first lens and the object side.
In an embodiment, the vehicle-mounted lens further includes a photosensitive chip and a protective glass, the photosensitive chip is disposed on a side of the fourth lens facing the image side direction, and the protective glass is disposed between the photosensitive chip and the fourth lens, so as to protect the photosensitive chip.
In an embodiment, the in-vehicle lens further includes a filter located at a side of the fourth lens in a direction toward the image side, the filter being configured to filter stray light in a non-operating band.
In an embodiment, the first lens is a concave-convex lens, and the object side surface of the first lens is a concave surface;
The second lens is a biconcave lens;
The third lens is a concave-convex lens, and the object side surface of the third lens is a concave surface;
The fourth lens is a concave-convex lens, and the object side surface of the fourth lens is a convex surface.
In an embodiment, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4, wherein:
4＜f1＜8，-13＜f2＜-9.3，3.0＜f3＜4.3，-8.2＜f4＜-6.5。
In an embodiment, the refractive index of the first lens is n1, the dispersion coefficient is v1, the refractive index of the second lens is n2, the dispersion coefficient is v2, the refractive index of the third lens is n3, the dispersion coefficient is v3, the Jiao Sheshe ratio of the fourth lens is n4, the dispersion coefficient is v4, wherein:
1.80≤n1≤2.05，1.55≤n2≤1.70，1.55≤n3≤1.70，1.55≤n4≤1.70，23≤v1≤28，18≤v2≤26，18≤v3≤26，18≤v4≤26。
in an embodiment, the optical total length of the vehicle lens is TTL, and the effective focal length of the vehicle lens is f, where:
TTL/f≤2.1。
The invention also provides a vehicle, which comprises the vehicle-mounted lens, wherein the vehicle-mounted lens is provided with an object side and an image side which are oppositely arranged along the optical axis direction, the vehicle-mounted lens comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power and an image plane which are sequentially arranged from the object side to the image side, so that the diameter of the image plane of the vehicle-mounted lens is between 5.0mm and 6.5mm, and the aperture value is between 2.2 and 2.4;
the first lens is a spherical lens, and the second lens, the third lens and the fourth lens are plastic aspherical lenses.
According to the technical scheme provided by the invention, the third lens with positive focal power is arranged to bear larger focal power of the system, change the propagation direction of the light beam, correct the aberration of the off-axis view field and be more beneficial to imaging the light beam on the image plane; by setting the first lens as a spherical lens, aberration is effectively improved, and the defocus at a high temperature is ensured; the second lens, the third lens and the fourth lens are all plastic aspherical lenses, so that the use proportion of the glass lens is greatly reduced, and the cost is reduced; the lens has gentle light trend, more light is introduced, the structure is more compact, and the diameter of an image plane is controlled within 6.5 mm. In the aspect of aperture, F is more than or equal to 2.2 and less than or equal to 2.4, the lens can clearly image under weak light, and the lens has good athermal effect and more stable working performance by reasonably setting the focal length ratio. By adopting only four lenses and reasonably setting the focal power and the shape matching relation of each lens, the vehicle-mounted lens with light weight, high imaging quality, low cost and low temperature drift is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an embodiment of a vehicle lens according to the present invention;
FIG. 2 is a schematic view of an MTF of an embodiment of the in-vehicle lens of FIG. 1;
fig. 3 is a schematic MTF diagram of an embodiment of the in-vehicle lens of fig. 1.
Reference numerals illustrate:
1000. vehicle-mounted lens; 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a diaphragm; 6. a light filter; 7. a protective glass; 8. and a photosensitive chip.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a 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 at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
With the continuous development of science and technology and the continuous progress of social development, the optical lens has more and more remarkable effect in the field of automobiles and is widely applied to vehicles. At present, the consumer market is towards low-cost and miniaturized trend, but many similar products have more lenses and more complicated structures. Most of the existing lenses with low cost and simple structure cannot be defocused in the environment with large temperature difference, and the size of the angle of view cannot meet the requirements of consumers.
The invention mainly aims to provide a vehicle-mounted lens and a vehicle, and aims to provide the vehicle-mounted lens which is light in weight, high in imaging quality, low in cost and low in temperature drift.
Referring to fig. 1, the present invention proposes a vehicle-mounted lens 1000 having an object side and an image side disposed opposite to each other along an optical axis, wherein the vehicle-mounted lens 1000 includes a first lens 1 with positive optical power, a second lens 2 with negative optical power, a third lens 3 with positive optical power, a fourth lens 4 with negative optical power, and an image plane sequentially disposed from the object side to the image side, such that an image plane diameter of the vehicle-mounted lens 1000 is between 5.0mm and 6.5mm, and an aperture value is between 2.2 and 2.4; the first lens 1 is a spherical lens, and the second lens 2, the third lens and the fourth lens 4 are plastic aspherical lenses.
According to the technical scheme provided by the invention, the third lens 3 with positive focal power is arranged to bear larger focal power of the system, change the propagation direction of the light beam, correct the aberration of the off-axis view field and be more beneficial to imaging the light beam on the image plane; by setting the first lens 1 as a spherical lens, aberration is effectively improved, and the defocus at a high temperature is ensured; by arranging the second lens 2, the third lens 3 and the fourth lens 4 as plastic aspherical lenses, the use proportion of the glass lenses is greatly reduced, and the cost is reduced; the lens has gentle light trend, more light is introduced, the structure is more compact, and the diameter of an image plane is controlled within 6.5 mm. In the aspect of aperture, F is more than or equal to 2.2 and less than or equal to 2.4, the lens can clearly image under weak light, and the lens has good athermal effect and more stable working performance by reasonably setting the focal length ratio. By adopting only four lenses and reasonably setting the focal power and the shape matching relation of each lens, the vehicle-mounted lens 1000 with light weight, high imaging quality, low cost and low temperature drift is realized.
The aspherical lens is characterized in that: the curvature is continuously variable from the center of the lens to the periphery of the lens, unlike a spherical lens which has a constant curvature from the center of the lens to the periphery of the lens.
Further, the in-vehicle lens 1000 further includes a diaphragm 5, and the diaphragm 5 is disposed between the first lens 1 and the object side. The diaphragm 5 limits the aperture of the light beam passing on the optical axis, and blocks part of light, thereby reducing light spots, improving image contrast, and playing roles of enlarging the target surface and improving the image quality. According to the actual situation, the luminous flux of the diaphragm 5 is adjusted, which is helpful for further improving the imaging quality.
Further, the vehicle lens 1000 further includes a photosensitive chip 8 and a protective glass 7, the photosensitive chip 8 is disposed on one side of the fourth lens 4 facing the image side direction, and the protective glass 7 is disposed between the photosensitive chip 8 and the fourth lens 4, so as to protect the photosensitive chip. The protective glass 7 can play roles of preventing water and dust and protecting the lens, so that the anti-interference capability of the vehicle-mounted lens 1000 is enhanced, and the imaging quality is improved.
It should be noted that the protective glass 7 is not limited to the function of protecting the photosensitive chip 8, and can be used for filtering stray light. Specifically, the protective glass 7 is an infrared cut filter, and the infrared cut filter can effectively filter out infrared light that does not need to reach the imaging surface, so as to improve imaging quality.
Further, the in-vehicle lens 1000 further includes a filter 6 disposed on a side of the fourth lens 4 in a direction toward the image side, and the filter 6 is configured to filter stray light in a non-operating band to reduce optical noise and reduce difficulty in subsequent processing of the optoelectronic module. The filter 6 can also be used to adjust the color saturation of the object image at the final imaging.
Specifically, in a preferred embodiment, referring to fig. 1, the first lens element 1 is a concave-convex lens element, and an object-side surface thereof is a concave surface; the second lens 2 is a biconcave lens; the third lens 3 is a concave-convex lens, and the object side surface of the third lens is a concave surface; the fourth lens 4 is a concave-convex lens, and the object side surface thereof is a convex surface.
Further, the focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, the focal length of the third lens 3 is f3, and the focal length of the fourth lens 4 is f4, wherein: 4 < f1 < 8, -13 < f2 < -9.3,3.0 < f3 < 4.3, -8.2 < f4 < -6.5. The embodiment is a preferred embodiment, and the optical power of the different lenses is reasonably distributed through the mutual combination of the different lenses, so that the whole lens has good performances of low cost, high pixels and the like.
Further, the refractive index of the first lens 1 is n1, the dispersion coefficient is v1, the refractive index of the second lens 2 is n2, the dispersion coefficient is v2, the refractive index of the third lens 3 is n3, the dispersion coefficient is v3, the focal refractive index of the fourth lens 4 is n4, the dispersion coefficient is v4, wherein: n1 is more than or equal to 1.80 and less than or equal to 2.05,1.55 n2 is more than or equal to 1.70,1.55 n3 is more than or equal to 1.70,1.55, n4 is more than or equal to 1.70, v1 is more than or equal to 23 and less than or equal to 28, v2 is more than or equal to 18 and less than or equal to 26, v2 is more than or equal to 18 is less than or equal to 26 percent. The present embodiment is a preferred embodiment, and the refractive index and the dispersion coefficient of the different lenses are reasonably distributed by combining the different lenses, so that the vehicle-mounted lens 1000 has the performances of low cost, high pixel, better athermalization and the like.
In an embodiment of the present invention, an optical total length of the vehicle lens 1000 is TTL, and an effective focal length of the vehicle lens 1000 is f, where: TTL/f is less than or equal to 2.1. By reasonably limiting the ratio of TTL to f, the whole lens is more compact, and the focal length of the vehicle-mounted lens 1000 is controlled, so that the miniaturization of the lens is realized.
It should be noted that the surface shape of the aspherical lens in the vehicle lens 1000 in this embodiment should satisfy the following equation:
Wherein c is the curvature corresponding to the radius; y is the radial coordinate (the unit is the same as the unit of lens length); k is the conic coefficient of the conic coefficient, A, B, C, D, E, F, g..represent fourth, sixth, eighth, tenth, fourteen, sixteen..aspheric coefficients, respectively. The shape and size of the aspherical surfaces of the lens facing the object side and the image side can be set by the above parameters.
When k is < -1, the surface shape curve of the corresponding lens is a hyperbola; when k= -1, the profile curve of the corresponding lens is parabolic; when-1 is less than k and less than 0, the surface shape curve of the corresponding lens is elliptical; when k=0, the profile curve of the corresponding lens is circular; when k > 0, the surface shape curve of the corresponding lens is oblate.
It should be noted that, in an embodiment of the present invention, the basic parameter table of the in-vehicle lens 1000 is shown in table 1, where the unit of curvature radius, thickness and half diameter is millimeter (mm).
TABLE 1
In the present embodiment, the aspherical coefficients of the aspherical lens in the in-vehicle lens 1000 include: the surface has a quadric surface coefficient k, a fourth-order aspherical surface coefficient a, a sixth-order aspherical surface coefficient B, an eighth-order aspherical surface coefficient C, a tenth-order aspherical surface coefficient D, a twelve-order aspherical surface coefficient E, a fourteen-order aspherical surface coefficient F, and a sixteen-order aspherical surface coefficient G, as shown in table 2 below.
TABLE 2
| Face numbering | k | A | B | C | D | E | F | G |
| 4 | 5.70E+01 | -3.87E-02 | 1.56E-02 | -3.04E-02 | 2.67E-02 | -1.27E-02 | 2.90E-03 | -2.26E-04 |
| 5 | 3.25E+00 | -2.90E-02 | -5.93E-03 | 4.12E-03 | -1.47E-03 | 3.61E-04 | -6.54E-05 | 5.90E-06 |
| 6 | -8.03E-01 | 3.53E-02 | -1.35E-02 | 2.67E-03 | 1.52E-03 | -8.23E-04 | 1.47E-04 | -9.55E-06 |
| 7 | -1.58E+00 | 1.40E-02 | -8.97E-03 | 1.79E-03 | 8.79E-05 | -4.88E-05 | 6.10E-06 | -5.02E-07 |
| 8 | -4.32E+01 | -2.76E-02 | -1.60E-03 | 1.79E-03 | -5.14E-04 | 7.68E-05 | -4.58E-06 | 5.98E+00 |
| 9 | -1.17E+01 | -4.75E-02 | 1.36E-02 | -3.79E-03 | 8.24E-04 | -1.20E-04 | 1.05E-05 | -3.97E-07 |
Referring to fig. 2, an MTF diagram of the on-vehicle lens 1000 in this embodiment is shown, wherein the horizontal axis represents the line pair number, the vertical axis represents the resolution, wherein the higher the vertical axis is, the stronger the resolution is, and the higher the image quality reduction is, wherein the MTF values are all greater than 0.3, which indicates that the imaging quality is very clear.
In this embodiment, the focal length of the vehicle-mounted lens 1000 is 4.95mm, the aperture value is 2.4, the image surface diameter is 6.3mm, the diagonal angle of view is 68 °, various aberrations of the lens are guaranteed to be corrected, the edge image quality is improved, the imaging quality is high, clear imaging can be performed under weak light, the image surface diameter of the lens is smaller, the lens is not out of focus under the environmental condition of-40 ℃ to +105 ℃, good performance is still maintained, and the working performance is stable.
It should be noted that, in another embodiment of the present invention, the basic parameter table of the in-vehicle lens 1000 is shown in table 3, where the unit of curvature radius, thickness and half diameter is millimeter (mm).
TABLE 3 Table 3
In the present embodiment, the aspherical coefficients of the aspherical lens in the in-vehicle lens 1000 include: the surface has a quadric surface coefficient k, a fourth-order aspherical surface coefficient a, a sixth-order aspherical surface coefficient B, an eighth-order aspherical surface coefficient C, a tenth-order aspherical surface coefficient D, a twelve-order aspherical surface coefficient E, a fourteen-order aspherical surface coefficient F, and a sixteen-order aspherical surface coefficient G, as shown in table 4 below.
TABLE 4 Table 4
| Face numbering | k | A | B | C | D | E | F | G |
| 4 | 5.70E+01 | -3.87E-02 | 1.56E-02 | -3.04E-02 | 2.67E-02 | -1.27E-02 | 2.90E-03 | -2.26E-04 |
| 5 | 3.25E+00 | -2.90E-02 | -5.93E-03 | 4.12E-03 | -1.47E-03 | 3.61E-04 | -6.54E-05 | 5.90E-06 |
| 6 | -8.03E-01 | 3.53E-02 | -1.35E-02 | 2.67E-03 | 1.52E-03 | -8.23E-04 | 1.47E-04 | -9.55E-06 |
| 7 | -1.58E+00 | 1.40E-02 | -8.97E-03 | 1.79E-03 | 8.79E-05 | -4.88E-05 | 6.10E-06 | -5.02E-07 |
| 8 | -4.32E+01 | -2.76E-02 | -1.60E-03 | 1.79E-03 | -5.14E-04 | 7.68E-05 | -4.58E-06 | 5.98E+00 |
| 9 | -1.17E+01 | -4.75E-02 | 1.36E-02 | -3.79E-03 | 8.24E-04 | -1.20E-04 | 1.05E-05 | -3.97E-07 |
Referring to fig. 3, an MTF diagram of the on-vehicle lens 1000 in this embodiment is shown, wherein the horizontal axis represents the line pair number, the vertical axis represents the resolution, wherein the higher the vertical axis is, the stronger the resolution is, and the higher the image quality reduction is, wherein the MTF values are all greater than 0.3, which indicates that the imaging quality is very clear.
In this embodiment, the focal length of the vehicle-mounted lens 1000 is 4.95mm, the aperture value is 2.4, the image plane diameter is 6.3mm, the diagonal angle of view is 67.2 °, various aberrations of the lens are guaranteed to be corrected, the edge image quality is improved, the imaging quality is high, clear imaging can be performed under weak light, the image plane diameter of the lens is smaller, the lens is not out of focus under the environmental condition of-40 ℃ to +105 ℃, good performance is still maintained, and the working performance is stable.
The invention also provides a vehicle, which comprises the vehicle-mounted lens 1000, and because the vehicle comprises the vehicle-mounted lens 1000, the specific structure of the vehicle-mounted lens 1000 refers to the above embodiment, and because the vehicle-mounted lens 1000 of the vehicle adopts all the technical schemes of all the embodiments, the vehicle-mounted lens 1000 at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.
The foregoing description is only exemplary embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (9)
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|---|---|---|---|
| CN202410900605.XA CN118707700A (en) | 2024-07-05 | 2024-07-05 | Vehicle-mounted lens and vehicle |
| CN202411403656.8A CN119087642B (en) | 2024-07-05 | 2024-10-09 | Vehicle-mounted lens and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410900605.XA CN118707700A (en) | 2024-07-05 | 2024-07-05 | Vehicle-mounted lens and vehicle |
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| CN202411403656.8A Active CN119087642B (en) | 2024-07-05 | 2024-10-09 | Vehicle-mounted lens and vehicle |
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| JP6434066B2 (en) * | 2017-01-23 | 2018-12-05 | カンタツ株式会社 | Imaging lens |
| CN111308652B (en) * | 2020-02-24 | 2021-07-30 | 诚瑞光学(常州)股份有限公司 | Camera optics |
| CN113946033B (en) * | 2021-09-28 | 2023-07-28 | 江西凤凰光学科技有限公司 | High-resolution wide-angle vehicle-mounted laser radar lens |
| CN218068428U (en) * | 2022-09-30 | 2022-12-16 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
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Application publication date: 20240927 |