Lenses and light-emitting devices

Abstract

The present invention relates to a lens and a light-emitting device, wherein the lower surface of the lens is provided with a light source cavity for housing an LED light source and a first light diffusion groove surrounding the light source cavity, and the first light diffusion groove is configured to house an adhesive for bonding the lens body to a substrate and diffusing the light rays reflected therefrom.

Description

Technical Field

[0001] The present invention relates to the field of optics, particularly to the field of control of light beams, and more particularly to lenses and light-emitting devices.

Background Art

[0002] Currently, a method for achieving a wide angle with a backlight light source is shown in FIG. 1. It is mainly achieved by arranging a flip-chip blue light LED chip 200 on a PCB substrate 100, and then dispensing silica gel 300 on the blue light LED chip 200 to cover the blue light LED chip 200. The silica gel 300 covering the blue light LED chip 200 mainly has two functions. The first is to block the blue light LED chip 200 from air, and the second is to change the light distribution of the blue light LED chip 200 to optimize the optical effect. This solution mainly involves dispensing silica gel 300 on the blue light LED chip 200, using the free flow of the silica gel 300 to form a shape, and controlling the shape of the silica gel molding by controlling the volume of the dispensed silica gel. As a result, the consistency of the silica gel molding becomes poor, and further the overall light-emitting effect of the backlight light source becomes poor. Furthermore, in order to control the shape of the silica gel molding by controlling the volume of the dispensed silica gel, the shape of the silica gel molding is relatively simple. For example, it can basically only be formed into an arc shape as shown in FIG. 1, and the light control effect on the blue light LED chip 200 is limited, and an ideal pattern distribution cannot be realized, which further affects the light-emitting effect.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In view of the drawbacks of the above related technologies, the purpose of the present application is to provide a lens and a light-emitting device to solve the problems of poor consistency and light control effect existing in the conventional method of changing the light-emitting distribution by dispensing silica gel on an LED chip. [Means for solving the problem]

[0004] To solve the above technical problems, the present invention provides a light-transmitting lens body having an upper lens surface and a lower lens surface, a light source cavity for housing an LED light source provided on the lower lens surface, the lens body having an optical axis, the lens body and the light source cavity being rotationally symmetric with respect to the optical axis, the inner surface of the light source cavity being configured as the light-receiving surface of the lens, and the upper lens surface being configured as the light-emitting surface of the lens. The lower surface of the lens is further provided with a first light diffusion groove surrounding the light source cavity, the first light diffusion groove is configured to contain an adhesive for bonding the lens body to a substrate, the refractive index of the adhesive is different from that of the lens body, and the first light diffusion groove diffuses the light rays reflected therein, thus providing a lens.

[0005] In some embodiments of the present invention, an overflow adhesive containment groove communicating with the first light diffusion groove is further provided on at least one side of the lower surface of the lens of the first light diffusion groove, and the overflow adhesive containment groove is configured to contain the adhesive that overflows from the first light diffusion groove.

[0006] In some embodiments of the present invention, overflow adhesive containment grooves communicating with the first light diffusion groove are provided on both sides of the first light diffusion groove.

[0007] In some embodiments of the present invention, the first light diffusion groove is located in a light concentration region on the lower surface of the lens, and the light concentration region is the region on the lower surface of the lens where the reflected light that is received is most concentrated.

[0008] In some embodiments of the present invention, the cross-sectional shape of the first light-diffusing groove is triangular or semicircular.

[0009] In some embodiments of the present application, at least one second light-diffusing groove surrounding the light source cavity is further provided in the region between the light source cavity and the first light-diffusing groove on the lower surface of the lens, and the second light-diffusing groove diffuses the light rays reflected therein. and / or, at least one third light diffusion groove surrounding the light source cavity is further provided in the region of the lower surface of the lens between the edge of the lens body and the first light diffusion groove, and the third light diffusion groove diffuses the light rays reflected therein.

[0010] In some embodiments of the present application, the groove wall of the first light-diffusing groove is rough.

[0011] In some embodiments of the present application, the groove walls of the second light diffusion groove and / or the third light diffusion groove are rough.

[0012] Based on a similar conceptual idea, the present invention further provides a light-emitting device comprising an LED light source and a lens as described above, wherein the LED light source is provided within the light source cavity of the lens.

[0013] As an option, the LED light source includes an LED chip. Effects of the present invention

[0014] The beneficial effects are as follows:

[0015] In the lens and light-emitting device provided in this application, the lens has a light-transmitting lens body, the lens body has an upper lens surface and a lower lens surface, the lower lens surface is provided with a light source cavity for housing an LED light source, the lens body and the light source cavity are rotationally symmetric with respect to the optical axis, the inner surface of the light source cavity is configured as the light-ingress surface of the lens, the upper lens surface is configured as the light-emitting surface of the lens, at least a portion of the light emitted from the LED light source provided in the light source cavity enters the lens body through the inner surface of the light source cavity and at least a portion of the incident light exits through the upper lens surface. The lower lens surface is provided with a first light diffusion groove surrounding the light source cavity, and the first light diffusion groove is configured to contain an adhesive for bonding the lens body to a substrate. Because the light emission distribution of the LED light source is altered by the lens and the lens body is fixed by the adhesive, the LED light source is sealed within the light source cavity, thereby ensuring isolation of the LED light source from the external environment and achieving protection of the LED light source. Furthermore, since the lens body is not formed by directly controlling the volume of silica gel dispensed on the LED chip and utilizing the fluidity of the silica gel, but rather by being manufactured in advance using a unified standard process, it is possible to guarantee consistency in the light emission distribution of each LED light source on the LED substrate passing through the lens, thereby improving the overall light emission effect.

[0016] Here, the refractive index of the adhesive differs from that of the lens body, and the first light diffusion groove diffuses the light reflected therein, thereby improving the light emission efficiency, as well as the uniformity of light mixing and emission of the lens, further enhancing the overall light emission effect. [Brief explanation of the drawing]

[0017] [Figure 1] This is a schematic diagram of the structure of an existing light-emitting device. [Figure 2] This is a schematic diagram of the lower surface of the lens of the lens structure 1 provided in an embodiment of the present invention. [Figure 3] Figure 2 is a schematic cross-sectional view of the lens body A1-A1. [Figure 4]It is a schematic cross-sectional view of the lens structure 2 provided in the embodiment of the present invention. [Figure 5] It is a schematic cross-sectional view of the lens structure 3 provided in the embodiment of the present invention. [Figure 6] It is a schematic cross-sectional view of the lens structure 4 provided in the embodiment of the present invention. [Figure 7] It is a schematic cross-sectional view of the lens structure 5 provided in the embodiment of the present invention. [Figure 8] It is a schematic cross-sectional view of the lens structure 6 provided in the embodiment of the present invention. [Figure 9] It is a schematic cross-sectional view of the lens structure 7 provided in the embodiment of the present invention. [Figure 10] It is a three-dimensional schematic view of the lens structure 8 provided in the embodiment of the present invention. [Figure 11] It is a three-dimensional schematic view of the lens structure 8 provided in the embodiment of the present invention. [Figure 12] It is a schematic view of the lower surface of the lens of the lens structure 8 provided in the embodiment of the present invention. [Figure 13] It is a schematic cross-sectional view of the lens body A2 - A2 of FIG. 13. [Figure 14] It is a schematic cross-sectional view of the lens structure 8 provided in the embodiment of the present invention. [Figure 15] It is a schematic cross-sectional view of the lens structure 9 provided in the embodiment of the present invention. [Figure 16] It is a schematic cross-sectional view of the lens structure 10 provided in the embodiment of the present invention. [Figure 17] It is a schematic cross-sectional view of the lens structure 11 provided in the embodiment of the present invention. [Figure 18] It is a schematic cross-sectional view of the light-emitting device provided in the embodiment of the present invention. [Figure 19] It is a schematic view of the optical path of the lens light ray provided in the embodiment of the present invention. [Figure 20] It is a schematic view of the optical path of the lens light ray provided in the embodiment of the present invention. [Figure 21] It is a schematic view of the illuminance of the reflected light from the lower surface of the lens where no light diffusion groove is provided in the embodiment of the present invention. [Figure 22] This is a schematic diagram of the optical path of a lens ray in an embodiment of the present invention in which no light diffusion groove is provided. [Figure 23] This is a cross-sectional curve of the illuminance of reflected light from the lower surface of a lens in an embodiment of the present invention, where no light diffusion groove is provided. [Modes for carrying out the invention]

[0018] To facilitate understanding of the present invention, it will be described more comprehensively with reference to the relevant drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, the purpose of providing these embodiments is to allow for a more thorough and comprehensive understanding of the disclosure of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art. Terms used in this specification are solely for the purpose of describing specific embodiments and are not intended to limit the invention.

[0020] Conventional methods for altering the light emission distribution by dispensing silica gel in LED chips suffer from problems with consistency and poor light control effectiveness. Based on this, the present invention aims to provide a solution that can solve the above technical problems, and the details thereof will be explained in the following embodiments.

[0021] An example of the lens provided in this embodiment is shown in Figures 2 and 3. Figure 2 is a schematic plan view of the lower surface of the lens in this example, and Figure 3 is a cross-sectional view along the line A1-A1 in Figure 2. The lens in this example has a light-transmitting lens body 1, which has a lens upper surface 10 and a lens lower surface 11, and a light source cavity 12 for housing an LED light source is provided on the lens lower surface 11, the lens body 1 has an optical axis OO, the lens body 1 and the light source cavity 12 are rotationally symmetric with respect to the optical axis OO, the inner surface of the light source cavity 12 is configured as the light-incoming surface of the lens, and the lens upper surface 10 is configured as the light-emitting surface of the lens, that is, at least a portion of the light emitted from the LED light source provided in the light source cavity 12 is incident on the lens body 1 through the inner surface of the light source cavity 12, and at least a portion of the incident light is emitted through the lens upper surface 10. In this example, the lower surface 11 of the lens is further provided with a first light diffusion groove 13 surrounding the light source cavity 12, and the first light diffusion groove 13 is configured to contain an adhesive (not shown) for bonding the lens body 1 to a substrate (not shown). That is, when in use, the LED light source is placed on the substrate, then adhesive is applied to the area of ​​the substrate around the LED light source corresponding to the first light diffusion groove 13 on the lower surface 11 of the lens, and then the lens body 1 is placed on the substrate, so that the first light diffusion groove 13 on the lower surface 11 of the lens aligns with the adhesive on the substrate and bonds, thereby achieving fixation of the lens body 1. In this example, it was found that the light emission distribution of the LED light source is changed by the lens, and the lens body 1 is aligned and fixed on the substrate by the adhesive, so the LED light source can be sealed inside the light source cavity 12, ensuring that the LED light source is isolated from the external environment and protecting the LED light source. Therefore, in this example, the existing process of protecting the LED chip by dispensing adhesive on the LED chip is omitted. In other words, in this example, there is no need to separately dispense adhesive on the LED chip, and the secondary optical design of the LED light source can be directly performed by the lens.Furthermore, the lens body 1 in this example is not directly formed by directly controlling the volume of silica gel dispensed on the LED chip and utilizing the fluidity of the silica gel, but can be pre-manufactured by a unified standard process. Therefore, when in use, it is aligned and fixed on the substrate in a manner not limited to the above example. This ensures consistency in the light emission distribution of each LED light source on the LED substrate passing through the lens, thereby improving the overall light emission effect.

[0022] In this example, when aligning and fixing the lens, the refractive index of the adhesive used differs from that of the lens body 1, and the first light diffusion groove 13 diffuses the light reflected therein. For example, by diffusing (also called light diffusion) the light reflected from the first light diffusion groove 13 provided from the upper surface 10 to the lower surface 11 of the lens, the light emission efficiency is improved, as is the uniformity of light mixing and emission of the lens, and the overall light emission effect can be further improved.

[0023] In this embodiment, the specific material of the lens body 1 is not limited and can be, for example, glass, silica gel, or acrylic. In this embodiment, the specific material of the adhesive is not limited and the first light diffusion groove 13 only needs to be able to diffuse the light reflected therein, as long as the refractive index of the adhesive is different from that of the lens body 1. In this embodiment, depending on the specific application requirements, the refractive index of the adhesive can be set to be smaller than that of the lens body 1, or it can be set to be larger than that of the lens body 1.

[0024] In this example, Figure 3 shows that the light source cavity 12 is an inverted groove, its groove opening is located on the lower surface 11 of the lens, and when the lens is positioned on the substrate, the light source cavity 12 of the lens body 1 covers the LED light source. In this example, the lens body 1 and the light source cavity 12 are rotationally symmetric with respect to the optical axis OO, and due to constraints of the lens manufacturing process, the lens body 1 and the light source cavity 12 are rotationally symmetric as a whole with respect to the optical axis OO. Furthermore, in this example, there are no restrictions on the specific shape of the light source cavity 12. Of course, in order to further improve the light mixing effect and light emission effect of the entire lens, at least a portion of the inner wall of the light source cavity 12 may be roughened.

[0025] In this example, the first light diffusion groove 13 surrounding the light source cavity 12 is annular, and the center of the first light diffusion groove 13 may be located on the optical axis OO. Of course, due to manufacturing process constraints, the center of the first light diffusion groove 13 may be slightly off from the optical axis OO in the actual product.

[0026] As shown in Figures 2 and 3, in this example, as an option, a lower recess 101 is further provided in the central region of the upper surface 10 of the lens to further improve the light emission effect of the lens, and the lower recess 101 may be rotationally symmetric with respect to the optical axis OO. By providing the lower recess 101, the light emitted from the LED light source is prevented from being concentrated and emitted from the central region of the upper surface 10 of the lens, thereby further improving the uniformity of light emission across the entire lens.

[0027] In this example, the cross-sectional shape of the first light-diffusing groove 13 may be triangular or semicircular in order to further improve the light-diffusing effect of the first light-diffusing groove 13 and to maximize the diffusion of reflected light rays within the first light-diffusing groove 13. Furthermore, in this example, the specific shape of the triangle is not particularly limited and can be set as needed, for example, an isosceles triangle, equilateral triangle, right triangle, or hypotenuse triangle. For example, as shown in Figure 3, the cross-sectional shape of the first light-diffusing groove 13 in this example is an isosceles triangle. In other application scenarios of this example, as shown in Figure 4, the cross-sectional shape of the first light-diffusing groove 13 is a hypotenuse triangle. It should also be understood that the specific values ​​of each angle of the triangle can determine the inclination of the groove wall of the first light-diffusing groove 13. The specific values ​​of each angle of the triangle can be flexibly set according to the specific application scenario and are not particularly limited here.

[0028] Of course, in this embodiment, the cross-sectional shape of the first light diffusion groove 13 provided on the lower surface 11 of the lens is not limited to a triangle or a semicircle. The cross-sectional shape of the first light diffusion groove 13 may be flexibly changed according to specific application requirements, while still satisfying the above-mentioned light diffusion function. Furthermore, the cross-sectional shape of the first light diffusion groove 13 may be a regular shape such as a trapezoid as shown in Figure 5 or an arc (specifically a semicircle) as shown in Figure 6, or it may be an irregular shape as needed, such as a stepped shape as shown in Figure 7. This embodiment is not particularly limited in this respect.

[0029] In this embodiment, in order to further improve the light control effect of the lens, the first light diffusion groove 13 can be provided in the light concentration region of the lower surface 11 of the lens (for example, all of the first light diffusion grooves 13 in each of the above examples can be provided in the light concentration region of the lower surface 11 of the lens). The light concentration region is the area on the lower surface 11 of the lens where the reflected light received (for example, light reflected from the light-emitting surface of the lens, but not limited to this) is most concentrated. The light concentration region can also be understood as the area on the lower surface of the lens where the amount of reflected light received is strongest. By diffusing the light reflected from the lower surface 11 of the lens as much as possible with the first light diffusion groove 11, the uniformity of light mixing and light emission of the lens can be improved to the maximum extent.

[0030] In some examples of this embodiment, in order to improve the reliability and sealing of the lens alignment and fixing on the substrate, and to improve the uniformity of light mixing and emission of the lens, an overflow adhesive containment groove is further provided on at least one side of the first light diffusion groove 13 on the lower surface 11 of the lens, communicating with the first light diffusion groove 13. The overflow adhesive containment groove is configured to contain adhesive that overflows from the first light diffusion groove 13, thereby preventing the packaging adhesive that overflows from the first light diffusion groove 13 from being located between the lower surface 11 of the lens and the substrate, and improving the sealing of the lens and adhesive to the LED light source. In addition, by providing the overflow adhesive containment groove, the bonding area between the adhesive and the lens body 1 can be increased, improving the reliability of fixing the lens to the substrate. Furthermore, in this example, since the first light diffusion groove 13 is configured to communicate with the overflow adhesive containment groove, the adhesive that overflows from the first light diffusion groove 13 can easily flow directly into the overflow adhesive containment groove. Of course, in some application scenarios, the overflow adhesive containment groove does not communicate with the first light diffusion groove 13, but the overflow adhesive containment groove and the first light diffusion groove 13 are configured to be adjacent to each other. To facilitate understanding, some configuration examples of the overflow adhesive containment groove are described below.

[0031] Figure 8 shows one example configuration. In this example, a first overflow adhesive containment groove 151 is provided on the outside of the first light diffusion groove 13. The first overflow adhesive containment groove 151 is in communication with the first light diffusion groove 13, so that adhesive overflowing from the first light diffusion groove 13 can flow directly into the first overflow adhesive containment groove 151. From Figure 8, it can be seen that in this embodiment, the outside of the first light diffusion groove 13 refers to the side of the first light diffusion groove 13 that is closer to the edge of the lens body.

[0032] Figure 9 shows another configuration example. In this example, a second overflow adhesive containment groove 152 is provided inside the first light diffusion groove 13. The second overflow adhesive containment groove 152 is in communication with the first light diffusion groove 13, so that adhesive overflowing from the first light diffusion groove 13 can flow directly into the second overflow adhesive containment groove 152. Referring to Figure 9, in this embodiment, the inside of the first light diffusion groove 13 refers to the side of the first light diffusion groove 13 that is closer to the center of the lens body.

[0033] Figure 13 shows another configuration example. In this example, a second overflow adhesive containment groove 152 is provided on the outside of the first light diffusion groove 13 and communicates with the first light diffusion groove 13, and a first overflow adhesive containment groove 151 is provided on the inside of the first light diffusion groove 13 and communicates with the first light diffusion groove 13. The first overflow adhesive containment groove 151 and the second overflow adhesive containment groove 152 communicate with each other to form an annular groove, and adhesive overflowing from the first light diffusion groove 13 can flow directly into the first overflow adhesive containment groove 151 and the second overflow adhesive containment groove 152.

[0034] Figures 10 to 13 show yet another configuration example, where Figure 13 is a cross-sectional view of lens A2-A2 shown in Figure 12. In this example, a first overflow adhesive containment groove 151 and a second overflow adhesive containment groove 152 are provided on the left and right sides of the first light diffusion groove 13, communicating with the first light diffusion groove 13. In this example, the first light diffusion groove 13, the first overflow adhesive containment groove 151, and the second overflow adhesive containment groove 152 are all in communication with each other.

[0035] Furthermore, it should be understood that the overflow adhesive containment groove in the above example also has the function of diffusing the light reflected therein. Therefore, the overflow adhesive containment groove further diffuses the light reflected by the lower surface 11 of the lens, thereby further improving the uniformity of light mixing and light emission of the lens.

[0036] In this embodiment, the cross-sectional shapes of the first light diffusion groove 13 and the overflow adhesive containment groove can be made the same, thereby improving the consistency of the light diffusion treatment by the first light diffusion groove 13 and the overflow adhesive containment groove. Of course, it should be understood that in this embodiment, the cross-sectional shapes of the first light diffusion groove 13 and the overflow adhesive containment groove may be different in order to improve the light emission effect of the lens.

[0037] In this embodiment, at least one of the groove walls of the first light diffusion groove 13 and the overflow adhesive containment groove can be made rough. This rough surface configuration further increases the bonding area between the adhesive and the lens body, further improving the fixing strength of the lens. In addition, the light diffusion effect is further improved, and the uniformity of light mixing and emission of the lens is further improved.

[0038] In yet another example of this embodiment, in order to further improve the light mixing effect and light emission effect of the lens, as shown in Figure 14, at least one second light diffusion groove 131 is further provided in the region of the lower surface 11 of the lens between the light source cavity 12 and the first light diffusion groove 13 (i.e., inside the first light diffusion groove 13), surrounding the light source cavity 12, and the second light diffusion groove 131 diffuses the light reflected therein. By providing the second light diffusion groove 131, the light reflected in the region of the lower surface 11 of the lens between the light source cavity 12 and the first light diffusion groove 13 can be diffused, thereby further improving the uniformity of lens light mixing and light emission. Furthermore, in this embodiment, if two or more second light diffusion grooves 131 are provided, each second light diffusion groove 131 can be sequentially nested, and the centers of each second light diffusion groove 131 may overlap, and the centers may or may not overlap with the centers of the first light diffusion groove 13, or at least some of the centers of the second light diffusion grooves 131 may overlap.

[0039] In yet another example of this embodiment, as shown in Figure 15, at least one third light diffusion groove 132 surrounding the light source cavity 12 is further provided in the region between the edge of the lens body 1 and the first light diffusion groove 13 on the lower surface 11 of the lens (i.e., outside the first light diffusion groove 13), and the third light diffusion groove 132 diffuses the light reflected therein. By providing the third light diffusion groove 132, the light reflected in the region between the edge of the lower surface 11 of the lens and the first light diffusion groove 13 can be diffused, thereby further improving the uniformity of lens light mixing and light emission. Furthermore, in this embodiment, if two or more third light diffusion grooves 132 are provided, each third light diffusion groove 132 can be sequentially nested, and the centers of each third light diffusion groove 132 may overlap, and the centers may or may not overlap with the center of the first light diffusion groove 13, or at least the centers of some of the third light diffusion grooves 132 may overlap.

[0040] In yet another example of this embodiment, as shown in Figure 16, at least one second light diffusion groove 131 surrounding the light source cavity 12 is provided in the region of the lower surface 11 of the lens between the light source cavity 12 and the first light diffusion groove 13, and at least one third light diffusion groove 132 surrounding the light source cavity 12 is provided in the region of the lower surface 11 of the lens between the edge of the lens body 1 and the first light diffusion groove 13. In this example, the light reflected from the region of the lower surface 11 of the lens between the light source cavity 12 and the first light diffusion groove 13, and the light reflected from the region of the lower surface 11 of the lens between the edge of the lower surface 11 and the first light diffusion groove 13, can be diffused by the second light diffusion groove 131 and the third light diffusion groove 132, respectively.

[0041] In this embodiment, it should be understood that, if necessary, the cross-sectional shapes of the first light diffusion groove 13, the second light diffusion groove 131, and the third light diffusion groove 132 may be the same, or, if necessary, the cross-sectional shapes of at least some of the first light diffusion groove 13, the second light diffusion groove 131, and the third light diffusion groove 132 may be different. Furthermore, in this embodiment, if multiple second light diffusion grooves 131 are provided, the cross-sectional shapes of the multiple second light diffusion grooves 131 may also be the same or different, if necessary. If multiple third light diffusion grooves 132 are provided, their cross-sectional shapes are set similarly, but this will not be repeated here. In addition, in this embodiment, at least one of the second light diffusion groove 131 and / or the third light diffusion groove 132 may be configured to have a rough surface. With this rough surface configuration, the light diffusion effect can be further improved, and the uniformity of light mixing and light emission of the lens can be further improved. In the above-mentioned examples of this embodiment, as shown in Figures 2 to 16, the lens body 1 may further include a lens side surface 14 connecting the lens upper surface 10 and the lens lower surface 11, and in this example, a portion of the light emitted from the LED light source may be emitted from the lens side surface 14. Of course, in yet another example of this embodiment, the lens upper surface 10 and the lens lower surface 11 may be directly connected, for example, as shown in Figure 17. Furthermore, in this embodiment, the lens lower surface 11 in each of the above examples is planar as a whole, thereby contributing to the flatness and sealing of the lens fixed to the substrate. Of course, the lens lower surface 11 does not have to be planar as required, but this will not be explained in detail here. In this embodiment, the overall shape of the lens body 1 can be flexibly set as required, and it has been found that there are no limitations in this embodiment.

[0042] As shown in Figure 18, this embodiment comprises an LED light source 3 and a lens as shown in the above example, wherein the LED light source 3 further provides a light-emitting device provided in the light source cavity 12 of the lens body 1 of the lens. Specifically, as shown in Figure 18, the light-emitting device further comprises a substrate 2, the LED light source 3 is provided on the substrate 2, and the lens body 1 is fixed to the substrate 2 by adhesive 4.

[0043] The LED light source 3 of this embodiment comprises an LED chip. For example, in some examples, the LED light source may be an LED chip, and the LED chip may be a DBR chip with an integrated DBR (Distributed Bragg Reflection) layer, or a normal LED chip (also called a bare chip) without an integrated DBR layer. Furthermore, the emitted color of the LED chip in this embodiment can be flexibly set according to the specific application requirements, and may be a blue light LED chip, or, if necessary, an ultraviolet LED chip, a green light LED chip, a red light LED chip, etc. Of course, if necessary, a configuration can be made by combining at least two of the various colored LED chips in the above examples. Of course, in this embodiment, the LED light source may consist only of an LED chip. The LED chip in this embodiment can be classified into mini LED chips, micro LED chips, or normal large LED chips depending on its size, and can be classified into face-up LED chips, flip-chip LED chips, or vertical LED chips depending on the arrangement of the electrodes of the LED chip, and can be flexibly set according to the application requirements, thus offering excellent versatility. In this example, it was found that the lens changes the light emission distribution of the LED chip, and the adhesive allows the lens body 1 to be positioned and fixed on the substrate, thus completely sealing the LED chip within the lens and protecting it from contact with the external environment. Furthermore, in this example, the conventional process of protecting the LED chip by dispensing adhesive onto the LED chip and changing the light emission portion of the LED chip is omitted. In other words, in this example, there is no need to separately dispense adhesive onto the LED chip, and the secondary optical design of the LED light source can be directly performed by the lens. In addition, the lens body 1 in this example is not directly formed by directly controlling the volume of silica gel dispensed on the LED chip and utilizing the fluidity of silica gel, but can be manufactured in advance by a unified standard process, and can be positioned and fixed on the substrate in a manner not limited to the above example when in use.This ensures consistency in the light emission distribution of each LED chip on the LED substrate passing through the lens, thereby improving the overall light emission effect.

[0044] The light-emitting device provided in this embodiment is applicable to various light-emitting fields. For example, it can be configured as a backlight module and applied to display backlight fields (backlight modules for terminals such as televisions, monitors, and mobile phones). Of course, it can also be used as a lighting fixture as needed. For example, it can be used for household lighting, medical lighting, educational lighting, plant lighting, decorative lighting, traffic lighting, and ultraviolet disinfection lighting. Of course, the LED device can also be used as a backlight source for buttons on key devices such as mobile phones, calculators, and keyboards, or as a camera flashlight. The above applications are only a small part of the applications illustrated in this embodiment. It should be understood that the applications of the light-emitting device of this embodiment are not limited to the fields illustrated above. The lens design means provided in this embodiment not only meets the requirement of a large light-emitting angle for the lens, but also improves the uniformity of the light-emitting brightness of the light-emitting device.

[0045] To facilitate understanding, the light emission effect of the lens provided in this embodiment will be described illustratively below. As shown in Figure 19, taking one of the light beads G1 emitted from the LED light source as an example, when the light beam G1 is emitted from the light-emitting surface of the lens via the light-receiving surface, a portion of the light G11 is emitted from the light-emitting surface, and another portion of the light G12 is reflected from the lower surface of the lens, in particular by the first light diffusion groove 13, diffused (e.g., reflected or refracted) by the groove walls of the first light diffusion groove 13, and then emitted from the light-emitting surface of the lens (e.g., the upper surface or side surface of the lens), thus improving the uniformity of light mixing and emission of the lens.

[0046] As yet another example, as shown in Figure 20, if we take light beams G1, G2, and G3 emitted from an LED light source as an example, when the light beams G1, G2, and G3 are emitted from the light-emitting surface of the lens via the light-receiving surface, some of the light G11, G21, and G31 are emitted from the light-emitting surface, while the remainder of the light G12, G22, and G32 are reflected from the lower surface of the lens, in particular by the first light diffusion groove 13 and / or overflow adhesive containment groove, diffused (e.g., reflected or refracted) by the groove walls of the first light diffusion groove 13 and / or overflow adhesive containment groove, and then emitted from the light-emitting surface of the lens (e.g., the upper surface or side surface of the lens), thus improving the uniformity of light mixing and emission of light from the lens.

[0047] To facilitate understanding, the following describes an example of determining the distribution of reflected light on the underside of the lens and the light concentration region on the underside of the lens. Referring to the schematic diagram of the illuminance of reflected light received on the underside of the lens shown in Figure 21, this represents the illuminance distribution when light rays are reflected from the light-emitting surface of the lens to the underside of the lens. A partial optical path diagram of the reflected light rays is shown in Figure 22, and the region on the underside of the lens where reflected light rays are concentrated and received is the light concentration region on the underside of the lens. Referring to the cross-sectional curve of the illuminance of reflected light from the underside of the lens shown in Figure 23, the horizontal axis represents the size of the underside of the lens (in mm), 0 represents the position of the optical axis OO, and the vertical axis represents the relative intensity of the reflected light from the light-emitting surface received on the underside of the lens. According to this figure, the precise coordinate range of the light concentration region on the underside of the lens can be accurately determined, and by providing the first light diffusion groove 13 in this light concentration region, the light reflected in the light concentration region can be diffused, thereby significantly improving the uniformity of light mixing and light emission of the lens. Furthermore, the lens provided in this embodiment has a simple structure, is easy to manufacture, and is low-cost.

[0048] The application of this invention is not limited to the examples given above, and those skilled in the art should understand that improvements and modifications can be made based on the above description, and all such improvements and modifications should be included within the scope of protection of the claims of this invention.

Claims

1. A lens having a light-transmitting lens body, the lens body having an upper lens surface and a lower lens surface, the lower lens surface being provided with a light source cavity for housing an LED light source, the lens body having an optical axis, the lens body and the light source cavity being rotationally symmetric with respect to the optical axis, the inner surface of the light source cavity being configured as the light-receiving surface of the lens, and the upper lens surface being configured as the light-emitting surface of the lens. A first light diffusion groove is further provided on the lower surface of the lens, surrounding the light source cavity, and the first light diffusion groove is configured to contain an adhesive for bonding the lens body to a substrate, wherein the refractive index of the adhesive is different from that of the lens body, and the first light diffusion groove diffuses the light rays reflected therein.

2. The lens according to claim 1, wherein at least one side of the lower surface of the lens is provided with an overflow adhesive containment groove that communicates with the first light diffusion groove, and the overflow adhesive containment groove is configured to contain the adhesive that has overflowed from the first light diffusion groove.

3. The lens according to claim 2, characterized in that overflow adhesive containment grooves communicating with the first light diffusion groove are provided on both sides of the first light diffusion groove.

4. The lens according to any one of claims 1 to 3, characterized in that the first light diffusion groove is located in a light concentration region on the lower surface of the lens, and the light concentration region is the region on the lower surface of the lens where the reflected light that is received is most concentrated.

5. The lens according to any one of claims 1 to 3, characterized in that the cross-sectional shape of the first light-diffusing groove is triangular or semicircular.

6. Within the region of the lower surface of the lens between the light source cavity and the first light diffusion groove, at least one second light diffusion groove surrounding the light source cavity is further provided, and the second light diffusion groove diffuses the light rays reflected therein. and / or, the lens according to any one of claims 1 to 3, wherein at least one third light diffusion groove surrounding the light source cavity is further provided in the region between the edge of the lens body and the first light diffusion groove on the lower surface of the lens, and the third light diffusion groove diffuses the light rays reflected therein.

7. The lens according to any one of claims 1 to 3, characterized in that the groove wall of the first light-diffusing groove is rough.

8. The lens according to claim 6, characterized in that the groove walls of the second light-diffusing groove and / or the third light-diffusing groove are rough.

9. A light-emitting device comprising an LED light source and a lens according to any one of claims 1 to 8, wherein the LED light source is provided in the light source cavity of the lens.

10. The light-emitting device according to claim 9, characterized in that the LED light source comprises an LED chip.

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