CN209370885U - The light source of small beam angle - Google Patents

Abstract

The utility model discloses a light source with a small beam angle, comprising a semiconductor light-emitting element and a lens. The semiconductor light-emitting element is embedded in the lens and is seamlessly combined with the lens. The lens has a top surface and a lens connected to the top surface. On the side, the semiconductor light-emitting element has more than one light-emitting surface, wherein at least one light-emitting surface is disposed toward the top surface of the lens, and at least part of the light emitted by the semiconductor light-emitting element to the side surface of the lens can be emitted by the side surface of the lens After reflection, it is transmitted along the optical axis. The light source with small beam angle of the utility model has a simple structure, which greatly increases the light utilization efficiency in the reflective lighting application; compared with the light source without lens, the light output power is increased by more than 10%; The primary lens is small in size and light in weight, and can be seamlessly connected with the chip when the light source is packaged, which is convenient for installation and improves the light output rate.

Description

Light source with small beam angle

technical field

The utility model relates to the design of a semiconductor illumination light source, in particular to a light source with a small beam angle.

Background technique

In recent years, LED light sources have been widely used in the field of lighting. At present, most LED light sources generally do not add a primary lens or a hemispherical primary lens in application. The light field obtained by this light source is usually Lambertian. As shown in Figure 1, the beam angle of the Lambertian light field is larger. In some applications, LED light sources with small beam angles are required, such as transmissive searchlights, transmissive flashlights, stage lights and other applications. In order to further expand the LED light source application market, it is necessary to optimize its design.

At present, light with a small beam angle can be obtained by designing a suitable secondary lens in the lamp, but the light emitted from the LED light source can only be effectively absorbed by the part (0°~+/-θ) projected on the surface of the secondary lens of the lamp. The lens is collimated and emitted, which becomes the main effective light of this type of lamps. The light that is not projected on the surface of the lens (+/-90°～+/-θ) is freely scattered and has no significant effect on the irradiation distance. As shown in FIG. 2 , it is a schematic diagram of a secondary lens in an existing lamp.

For the Lambertian light field, calculated according to the formula, as shown in Figure 3, when the θ angle is 45°, the light utilization efficiency is only 50%; when the θ angle is 30°, the light utilization efficiency drops to 25%; When the light utilization efficiency reaches more than 75%, the θ angle must be less than 60°, which means that the diameter of the lens needs to be increased a lot, which will bring a series of problems such as increased lens manufacturing cost and difficulty, and increased lamp size and weight. The formula can be expressed as:

where η: light utilization efficiency; θ: the included angle between the line connecting the LED light source and the edge of the lens and the normal direction of the LED light source; i(θ): the light intensity of the LED light source at an angle of θ.

The secondary lens refers to the optical lens installed in front of the light source in order to obtain the required light field in the process of assembling the lamp. There are usually gaps and gaps between the secondary lens and the light source, and they are not integrated. Compared with the primary lens, the secondary lens in the lamp cannot increase the light extraction efficiency of the LED, but can only change the propagation path of the light emitted from the LED to the outside world. The secondary lens is bulky, heavy, and expensive.

Utility model content

In view of the deficiencies of the prior art, the purpose of the present invention is to provide a light source with a small beam angle, which has the characteristics of improving light extraction efficiency, simple and convenient manufacturing process, low cost, and small size.

To achieve the foregoing purpose, the present invention adopts the following technical solutions:

The embodiment of the present invention provides a light source with a small beam angle, which includes a semiconductor light-emitting element and a lens, the semiconductor light-emitting element is embedded in the lens and is seamlessly combined with the lens, and the lens has a top surface and a top surface and a top surface. The side surface connected to the surface, the semiconductor light-emitting element has more than one light-emitting surface, wherein at least one light-emitting surface is disposed toward the top surface of the lens, and at least part of the light emitted by the semiconductor light-emitting element to the side surface of the lens can be absorbed by the lens. The side surface of the lens is reflected and transmitted along the optical axis.

In some embodiments, the light emitted by the semiconductor light emitting element toward the top surface of the lens can be transmitted from the top surface of the lens and transmitted along the optical axis.

Further, the ratio of the size of the light-emitting surface of the semiconductor light-emitting element facing the top surface of the lens to the maximum size of the top surface of the lens is less than 2:3.

Further, the shape of the light emitting surface of the semiconductor light-emitting element facing the top surface of the lens or the top surface of the lens includes a circle, a rectangle, a rhombus or a polygon.

Further, the top surface of the lens includes a flat surface or a convex surface.

Further, the side surface of the lens is a transparent surface, and the light emitted by the semiconductor light-emitting element to the side surface of the lens and the incident angle is greater than the total reflection angle can be reflected by the side surface of the lens and then transmitted along the optical axis; or, the The side surface of the lens is a reflective surface, and the light emitted from the semiconductor light-emitting element to the side surface of the lens can be reflected by the side surface of the lens and then transmitted along the optical axis.

Compared with the prior art, the present invention has at least the following advantages:

1) The light source with a small beam angle provided by the present invention has a simple structure, can effectively improve the light extraction efficiency, the manufacturing process is simple and convenient, low cost, small in size, and suitable for large-scale manufacturing and application;

2) The light source with small beam angle provided by the utility model greatly increases the utilization efficiency of light in reflective lighting applications; compared with the light source without lens, the light output power is increased by more than 10%; The primary lens is small in size and light in weight, and can be seamlessly connected with the chip when the light source is packaged, which is convenient for installation and improves the light output rate;

3) Compared with the usual Lambertian light field, the light source with a small beam angle provided by the present invention can reduce the diameter of the lamp lens a lot under the same light utilization efficiency, and accordingly the volume and weight of the lamp can be reduced.

Description of drawings

Figure 1 is a schematic diagram of a Lambertian light field.

Figure 2 is a schematic diagram of a secondary lens in a lamp.

FIG. 3 is a graph showing the relationship between the light utilization efficiency and the angle of the Lambertian light field.

4 is a light field distribution diagram corresponding to a light source with a small beam angle in a preferred embodiment of the present invention.

5 is a graph showing the relationship between the light utilization efficiency and the angle of a light source with a small beam angle in a preferred embodiment of the present invention.

6a-6f are respectively schematic structural diagrams of light sources with small beam angles in different preferred embodiments of the present invention.

7 is a light field distribution diagram corresponding to a light source with a small beam angle in another preferred embodiment of the present invention.

Description of reference numerals: 1-primary lens, 2-fluorescent layer, 3-LED chip, 4-package substrate, 5-reflection cup.

Detailed ways

In view of the deficiencies in the prior art, the inventor of the present application has been able to propose the technical solution of the present invention after long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

One aspect of the embodiments of the present invention provides a light source with a small beam angle, which includes a semiconductor light-emitting element and a lens, the semiconductor light-emitting element is embedded in the lens and seamlessly combined with the lens, and the lens has a top surface and a side surface connected to the top surface, the semiconductor light-emitting element has more than one light-emitting surface, wherein at least one light-emitting surface is disposed toward the top surface of the lens, and at least part of the light emitted by the semiconductor light-emitting element toward the side surface of the lens It can be reflected by the side surface of the lens and then transmitted along the optical axis.

In some embodiments, the light emitted by the semiconductor light emitting element toward the top surface of the lens can be transmitted from the top surface of the lens and transmitted along the optical axis.

In some embodiments, the ratio of the size (eg diameter or diagonal length) of the light exit surface of the semiconductor light-emitting element facing the top surface of the lens to the largest dimension (eg diameter or diagonal length) of the top surface of the lens Less than 2:3.

In some embodiments, the light emitting surface of the semiconductor light-emitting element facing the top surface of the lens or the top surface of the lens has a shape of a circle or a square, and the square can be a rectangle, a rhombus, a polygon, etc., but is not limited thereto. Wherein, when the light-emitting surface of the semiconductor light-emitting element facing the top surface of the lens or the top surface of the lens is circular, the size is calculated in terms of diameter; when the light-emitting surface of the semiconductor light-emitting element facing the top surface of the lens or the top surface of the lens is a square , dimensions are calculated in diagonal length.

In some embodiments, the lens top surface includes a flat surface or a convex surface, but is not limited thereto.

Further, the convex surface includes any one or a combination of a spherical surface, a hyperboloid surface, a parabolic surface, a conical surface, etc., for example, the convex surface may be an array-type convex surface, etc., but not limited thereto.

In some embodiments, the side surface of the lens is a transparent surface, and the light emitted by the semiconductor light-emitting element to the side surface of the lens and the incident angle is greater than the total reflection angle can be reflected by the side surface of the lens and then transmitted along the optical axis; or The side surface of the lens is a reflective surface, and the light emitted by the semiconductor light-emitting element to the side surface of the lens can be reflected by the side surface of the lens and then transmitted along the optical axis.

In some embodiments, the side surface of the lens is a curved surface.

Further, the dimension (eg diameter or diagonal length) of the upper part of the arc-shaped surface is larger than the dimension (eg diameter or diagonal length) of the lower part.

Furthermore, the side surface of the lens is an arc-shaped surface (transparent or reflective surface) with a small bottom and a large top, and the top surface of the lens is a convex surface (transparent surface), so that the light field converges along the light source axis to form a Small beam angle.

Further, the arc-shaped surface includes a paraboloid, a spherical surface, a hyperboloid, etc., and both a transmission surface and a reflection surface are acceptable, but not limited thereto.

Further, the lens is made of a transparent material, which may specifically include silica gel, PC, PMMA, glass, PP, PS, PVC, PET, ABS, SAN, etc., but is not limited thereto.

In some embodiments, the semiconductor light-emitting element includes an LED chip, and the LED chip is directly combined with a lens; or, the semiconductor light-emitting element includes an LED chip, and at least the light-emitting surface of the LED chip is covered with a fluorescent layer , the fluorescent layer is directly combined with the lens.

Further, the number of the LED chips is more than one, and the LED chips may be LED chips with various wavelengths such as blue light, red light, green light, yellow light, infrared light, etc., but not limited thereto.

Further, the material of the phosphor layer is phosphor powder, and the phosphor powder may be phosphor powder with different wavelengths such as no phosphor powder, yellow light phosphor powder, green light phosphor powder, red light phosphor powder, etc., but is not limited thereto.

Further, the maximum diameter of the top convex surface of the aforementioned primary lens is more than 1.5 times the size of the phosphor layer.

In some embodiments, the bottom surface of the semiconductor light emitting element is combined with the substrate, the top surface and the side surface of the semiconductor light emitting element are both light emitting surfaces, and the top surface and the side surface of the semiconductor light emitting element face the top of the lens respectively face and side settings.

Further, seamless connection is achieved between the aforementioned primary lens, the fluorescent layer and the semiconductor light-emitting element. The side arc surface of the primary lens has the function of reflecting the large-angle light emitted from the semiconductor light-emitting element and entering the primary lens through the fluorescent layer. The convex surface on the top of the primary lens has the function of refracting light with a smaller angle and converging it toward the light source axis.

To sum up, the light source with small beam angle of the present invention has a simple structure, which greatly increases the light utilization efficiency in reflective lighting applications; compared with the light source without lens, the light output power is increased by more than 10%; Compared with the lens, the primary lens is small in size and light in weight, and can be seamlessly connected with the chip when the light source is packaged, which is convenient for installation and improves the light output rate; application.

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the technical solutions of the present invention will be further explained in detail below with reference to some preferred embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention, but the experimental conditions and setting parameters therein should not be regarded as limitations on the basic technical solutions of the present invention. And the protection scope of the present invention is not limited to the following embodiments. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as there is no conflict with each other.

Please refer to FIG. 6 a , which is a typical structure of an LED light source with a small beam angle according to a typical embodiment of the present invention, which includes a primary lens 1 , a phosphor layer 2 , an LED chip 3 and a package substrate 4 . The primary lens is seamlessly connected with the LED chip 3 or the phosphor glue. Specifically, the light-emitting surface of the LED chip 3 is covered with a fluorescent layer 2 , and the fluorescent layer 2 is directly combined with the primary lens 1 . The bottom surface of the LED chip 3 is combined with the packaging substrate 4 , the top surface and the side surface of the LED chip 3 are light emitting surfaces, and the top surface and the side surface of the LED chip 3 face the top surface and the side surface of the primary lens 1 respectively. Side settings.

Wherein, the side of the primary lens 1 is an arc-shaped surface (transparent or reflective surface) with a small bottom and a large top, and the top surface of the primary lens 1 is a convex surface (transparent surface), so that the light field converges along the light source axis. form a small beam angle. The primary lens 1 has a top surface and a side surface connected to the top surface, the LED chip 3 has more than one light-emitting surface, at least one light-emitting surface is disposed toward the top surface of the primary lens 1, and the LED chip 3 has more than one light-emitting surface. At least part of the light radiating to the side surface of the primary lens 1 can be reflected by the side surface of the primary lens 1 and then transmitted along the optical axis.

Wherein, the aforementioned primary lens 1 , phosphor layer 2 and LED chip 3 are seamlessly connected. The side arc surface of the primary lens 1 has the function of reflecting the large-angle light emitted from the aforementioned LED chip 3 through the fluorescent layer 2 and entering the primary lens 1 along the light source axis (the side arc surface of the primary lens 1 is a transparent surface: the angle greater than the total reflection angle is reflected out. The light of the primary lens 1 is reflected along the axis of the light source; the arc surface of the primary lens 1 is a reflective surface: all the light is reflected), and the convex surface of the top of the primary lens 1 has the function of refracting the light at a smaller angle to the axial convergence of the light source .

Further, the ratio of the diameter of the light emitting surface of the LED chip 3 facing the top surface of the primary lens 1 to the maximum diameter of the top surface of the primary lens 1 is less than 2:3.

Further, the diameter of the light emitting surface corresponding to the top surface of the LED chip 3 and the primary lens 1 is smaller than the diameter of the top surface of the primary lens 1 , that is, L1 in FIG. 6 a is greater than 1.5×L2 .

Further, in this preferred embodiment, the primary lens 1 is made of a transparent material, which may specifically include silica gel, PC, PMMA, glass, PP, PS, PVC, PET, ABS, SAN, etc., but is not limited thereto.

Further, in this preferred embodiment, the number of LED chips 3 is more than one, and the LED chips may be LED chips with various wavelengths such as blue light, red light, green light, yellow light, and infrared light, but are not limited thereto.

Further, in this preferred embodiment, the material of the phosphor layer 2 is phosphor powder, and the phosphor powder can be phosphor powder with different wavelengths such as no phosphor powder, yellow light phosphor powder, green light phosphor powder, red light phosphor powder, etc. , but not limited to this.

Further, the maximum diameter of the top convex surface of the aforementioned primary lens 1 is more than 1.5 times the size of the phosphor layer 2 .

The working principle of the LED light source with small beam angle in this embodiment is at least as follows:

1. The function of the side arc surface of the primary lens:

Reflect the large-angle light along the axis of the light source; (the side arc surface of the primary lens is a transparent surface: the light greater than the total reflection angle is reflected along the axis of the light source; the side arc surface of the primary lens is the reflecting surface: all the light is reflected out

2. The role of the top convex surface of the primary lens:

The light rays of smaller angles are refracted and converged toward the axis of the light source.

Further, the diameter of the top concave surface of the primary lens is larger than the size of the phosphor layer.

Further, the primary lens can be seamlessly connected with the LED chip during packaging, thereby increasing the optical power.

After testing, the graph of the relationship between the light utilization efficiency and the angle of the LED light source with a small beam angle of this embodiment is shown in FIG. 5 . Among them, when the θ angle is 30°, the light utilization efficiency is >58%; when the θ angle is 45°, the light utilization efficiency is >90%; compared with the usual Lambertian light field, under the same light utilization efficiency conditions, the second lamp The diameter of the secondary lens can be reduced a lot, and the volume and weight of the corresponding lamp will be reduced.

Further, the convex surface of the primary lens can be any one or a combination of a spherical surface, a hyperboloid surface, a parabolic surface, and a conical surface. For example, the convex surface can be an array convex surface, etc. The side surface of the lens includes transparent A curved surface with a small bottom and a large top, the curved surface can be a paraboloid, a spherical surface or a hyperboloid, etc. Therefore, the specific structure of the LED light source with a small beam angle of the present invention has many forms, for example, please refer to Figure 6b-Figure 6f shown structures, but not limited to these structures. Among them, Fig. 6d also has the structure of the reflection cup 5.

Please refer to Figure 4 for the corresponding light field distribution diagram of the LED light source with a small beam angle in a preferred embodiment of the present invention. After adding a lens, the optical power efficiency is increased by 15%. It can be seen from Figure 4 that the experimental structure shows that, The 50% beam angle is about 60°.

Further, the corresponding light field distribution diagram of the LED light source with a small beam angle in another preferred embodiment of the present invention is shown in FIG. 7 .

To sum up, with the above technical solutions of the present invention, the light source with small beam angle of the present invention greatly increases the utilization efficiency of light in reflective lighting applications; compared with the light source without lens, the light output power is improved More than 10%; compared with the secondary lens, the primary lens is small in size and light in weight, and can be seamlessly connected to the chip when the light source is packaged, which is easy to install, can effectively improve the light extraction efficiency, the process is simple and convenient, low cost, Small size, suitable for large-scale manufacturing and application.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

It should be understood that the above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and its purpose is to enable those who are familiar with the technology to understand the content of the present invention and implement accordingly, and cannot limit the protection of the present invention. scope. All equivalent changes or modifications made according to the spirit of the present invention shall be included within the protection scope of the present invention.

Claims (12)

1. a light source with a small beam angle, characterized in that it comprises a semiconductor light-emitting element and a lens, the semiconductor light-emitting element is embedded in the lens and seamlessly combined with the lens, and the lens has a top surface and a On the side, the semiconductor light-emitting element has more than one light-emitting surface, wherein at least one light-emitting surface is disposed toward the top surface of the lens, and at least part of the light emitted by the semiconductor light-emitting element to the side surface of the lens can be emitted by the side surface of the lens After reflection, it is transmitted along the optical axis. 2 . The light source with a small beam angle according to claim 1 , wherein the light emitted from the semiconductor light-emitting element to the top surface of the lens can be transmitted from the top surface of the lens and transmitted along the optical axis. 3 . 3. The light source with a small beam angle as claimed in claim 1 or 2, wherein the ratio of the size of the light-emitting surface of the semiconductor light-emitting element toward the top surface of the lens to the maximum size of the top surface of the lens is less than 2: 3. 4 . The light source with small beam angle according to claim 3 , wherein the light-emitting surface of the semiconductor light-emitting element facing the top surface of the lens or the shape of the top surface of the lens comprises a circle, a rectangle, a rhombus or a polygon. 5 . 5. The light source with a small beam angle according to claim 1 or 2, wherein the top surface of the lens comprises a flat surface or a convex surface. 6 . The light source with a small beam angle according to claim 5 , wherein the convex surface comprises any one or a combination of a spherical surface, a hyperboloid surface, a parabolic surface, and a conical surface. 7 . 7 . The light source with a small beam angle according to claim 6 , wherein the convex surface comprises an array convex surface. 8 . 8 . The light source with a small beam angle according to claim 1 , wherein the side surface of the lens is a transparent surface, and the light rays with an incident angle greater than the total reflection angle emitted by the semiconductor light-emitting element to the side surface of the lens can After being reflected by the side surface of the lens, it is transmitted along the optical axis; or, the side surface of the lens is a reflective surface, and the light emitted by the semiconductor light-emitting element to the side surface of the lens can be reflected by the side surface of the lens and then transmitted along the optical axis. 9 . The light source with a small beam angle according to claim 1 , wherein the side surface of the lens is an arc surface. 10 . 10 . The light source with a small beam angle according to claim 9 , wherein: the size of the upper part of the arc-shaped surface is larger than that of the lower part; and/or the arc-shaped surface comprises a paraboloid, a spherical surface or a hyperboloid. 11 . 11. The light source with a small beam angle according to claim 1, wherein the semiconductor light-emitting element comprises an LED chip, and the LED chip is directly combined with the lens; or, at least the light-emitting surface of the LED chip is coated Covered with a phosphor layer, the phosphor layer is directly combined with the lens. 12 . The light source with a small beam angle according to claim 1 , wherein the bottom surface of the semiconductor light-emitting element is combined with the substrate, the top surface and the side surface of the semiconductor light-emitting element are light-emitting surfaces, and the semiconductor light-emitting element emits light. 13 . The top surface and the side surface of the element are respectively disposed toward the top surface and the side surface of the lens.