Lens and light-emitting device

Abstract

Lens, characterized in that the lens has a transparent lens body, wherein the lens body has a lens top and a lens bottom; and wherein the lens bottom is provided with a light source cavity for receiving an LED light source; and wherein the lens body has an optical axis, and wherein the lens body and the light source cavity are rotationally symmetric with respect to an optical axis; and wherein the inner surface of the light source cavity is configured as the light entrance surface of the lens, and wherein the lens top is configured as the light exit surface of the lens, and wherein a first light-scattering groove is further provided on the lens bottom, surrounding the light source cavity, and wherein the first light-scattering groove is configured to receive an adhesive for bonding the lens body to the substrate;and wherein the refractive index of the adhesive differs from the refractive index of the lens body, and wherein the first light-scattering groove scatters the light reflected thereon.;

Description

Lens and light-emitting device Technical Field

[0001] The present application relates to the field of optics, specifically to the field of light beam control, and more particularly to a lens and a light-emitting device. Background Art

[0002] The current method for achieving a wide-angle backlight source is shown in Figure 1. This method primarily involves die-bonding a flip-chip blue LED chip 200 onto a PCB 100, then applying silicone gel 300 to the blue LED chip 200 to encapsulate the blue LED chip 200. The silicone gel 300 applied to the blue LED chip 200 serves two primary functions: first, it isolates the blue LED chip 200 from the air, protecting the chip; and second, it modifies the light distribution of the blue LED chip 200, optimizing the optical effect. This solution primarily involves applying silicone gel 300 to the blue LED chip 200, shaping it through the free flow of the silicone gel 300. Controlling the volume of the applied silicone gel and thus the shape of the silicone gel results in poor consistency in the silicone gel forming, which in turn leads to poor overall light output from the backlight source. Furthermore, controlling the volume of the applied silicone gel results in a relatively simple shape, such as the arc shape shown in Figure 1. This limited light control effect on the blue LED chip 200 prevents the desired light distribution from being achieved, further impacting light output. Technical issues

[0003] In view of the deficiencies of the above-mentioned related technologies, the purpose of this application is to provide a lens and a light-emitting device, aiming to solve the problems of poor consistency and light control effect caused by changing the light distribution by applying silicone on the LED chip. Technical Solutions

[0004] To solve the above technical problems, the present application provides a lens, comprising a light-transmissive lens body, the lens body having a lens top surface and a lens bottom surface; the lens bottom surface is provided with a light source cavity for accommodating an LED light source; the lens body has an optical axis, and the lens body and the light source cavity are rotationally symmetric about the optical axis; the inner surface of the light source cavity is configured as a light incident surface of the lens, and the lens top surface is configured as a light exit surface of the lens;

[0005] The bottom surface of the lens is also provided with a first light diffusion groove surrounding the light source cavity, and the first light diffusion groove is configured to accommodate adhesive to bond the lens body to the substrate; the refractive index of the adhesive is different from the refractive index of the lens body, and the first light diffusion groove diffuses the light reflected onto it.

[0006] Based on the same inventive concept, the present application also provides a light-emitting device, comprising an LED light source and the lens as described above, wherein the LED light source is disposed in the light source cavity of the lens. Beneficial effects

[0007] The lens and light-emitting device provided by the present application are characterized in that the lens has a light-transmitting lens body, the lens body has a lens top surface and a lens bottom surface; the lens bottom surface is provided with a light source cavity for accommodating an LED light source; the lens body and the light source cavity are rotationally symmetrical about the optical axis; the inner surface of the light source cavity is configured as the light incident surface of the lens, and the lens top surface is configured as the light exit surface of the lens; at least a portion of the light emitted by the LED light source arranged in the light source cavity is incident on the transparent body through the inner surface of the light source cavity, and at least a portion of the incident light is emitted through the lens top surface. A first light diffusion groove is provided on the lens bottom surface surrounding the light source cavity, and the first light diffusion groove is configured to accommodate adhesive to adhere the lens body to the substrate; the light output distribution of the LED light source is changed by the lens, and the lens body is fixed by the adhesive, so that the LED light source can be sealed in the light source cavity, which can ensure the isolation of the LED light source from the external environment and realize the protection of the LED light source. Moreover, the lens body is not formed directly on the LED chip by controlling the volume of silicone at certain points and utilizing the fluidity of silicone, but can be prepared in advance through a unified and standard process. Therefore, the consistency of the light distribution of each LED light source on the LED substrate through the lens can be guaranteed, thereby improving the overall light output effect.

[0008] The refractive index of the adhesive is different from that of the lens body, and the first light diffusion groove diffuses the light reflected thereon, thereby improving the light output efficiency and the uniformity of the lens light mixing and light output, thereby further improving the overall light output effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a schematic structural diagram of an existing light emitting device;

[0010] FIG2 is a schematic diagram of the bottom surface of a lens of a lens structure 1 provided in an embodiment of the present application;

[0011] FIG3 is a schematic cross-sectional view of the lens body A1-A1 in FIG2 ;

[0012] FIG4 is a cross-sectional schematic diagram of a second lens structure provided in an embodiment of the present application;

[0013] FIG5 is a cross-sectional schematic diagram of a lens structure 3 provided in an embodiment of the present application;

[0014] FIG6 is a cross-sectional schematic diagram of a lens structure 4 provided in an embodiment of the present application;

[0015] FIG7 is a cross-sectional schematic diagram of a lens structure 5 provided in an embodiment of the present application;

[0016] FIG8 is a cross-sectional schematic diagram of a lens structure 6 provided in an embodiment of the present application;

[0017] FIG9 is a cross-sectional schematic diagram of a lens structure 7 provided in an embodiment of the present application;

[0018] FIG10 is a first perspective diagram of a lens structure eight provided in an embodiment of the present application;

[0019] FIG11 is a second perspective schematic diagram of a lens structure eight provided in an embodiment of the present application;

[0020] FIG12 is a schematic diagram of the bottom surface of a lens structure eight provided in an embodiment of the present application;

[0021] FIG13 is a schematic cross-sectional view of the lens body A2-A2 in FIG13 ;

[0022] FIG14 is a cross-sectional schematic diagram of a lens structure eight provided in an embodiment of the present application;

[0023] FIG15 is a cross-sectional schematic diagram of a lens structure nine provided in an embodiment of the present application;

[0024] FIG16 is a cross-sectional schematic diagram of a lens structure 10 provided in an embodiment of the present application;

[0025] FIG17 is a cross-sectional schematic diagram of a lens structure 11 provided in an embodiment of the present application;

[0026] FIG18 is a cross-sectional schematic diagram of a light-emitting device provided in an embodiment of the present application;

[0027] FIG19 is a first schematic diagram of the optical path of lens light provided in an embodiment of the present application;

[0028] FIG20 is a second schematic diagram of the optical path of lens light provided in an embodiment of the present application;

[0029] FIG21 is a schematic diagram of the illumination of reflected light from the bottom surface of a lens without light diffusion grooves in an embodiment of the present application;

[0030] FIG22 is a schematic diagram of the optical path of light rays from a lens without light diffusion grooves in an embodiment of the present application;

[0031] FIG. 23 is a cross-sectional curve of the reflected light illumination of the bottom surface of the lens without light diffusion grooves in the embodiment of the present application. Modes for Carrying Out the Invention

[0032] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0034] The existing method of changing the light distribution by applying silicone on the LED chip has the problem of poor consistency and light control effect. Based on this, the present application hopes to provide a solution that can solve the above technical problems, and its details will be described in the subsequent embodiments.

[0035] An example of a lens provided in this embodiment is shown in Figures 2 and 3, wherein Figure 2 is a plan view of the bottom surface of the lens in this example, and Figure 3 is a cross-sectional view along A1-A1 in Figure 2. The lens in this example has a light-transmissive lens body 1, wherein the lens body 1 has a lens top surface 10 and a lens bottom surface 11; the lens bottom surface 11 is provided with a light source cavity 12 for accommodating an LED light source; the lens body 1 has an optical axis OO, and the lens body 1 and the light source cavity 12 are rotationally symmetrical about the optical axis OO; the inner surface of the light source cavity 12 is configured as the light incident surface of the lens, and the lens top surface 10 is configured as the light exit surface of the lens; that is, at least a portion of the light emitted by the LED light source provided in the light source cavity 12 is incident on the transparent 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 top surface 10. In this example, the lens bottom surface 11 is further provided with a first light-diffusing groove 13 surrounding the light source cavity 12. This first light-diffusing groove 13 is configured to receive adhesive (not shown) for bonding the lens body 1 to a substrate (not shown). Specifically, during use, an LED light source can be placed on the substrate. Adhesive is then applied to the substrate around the LED light source, corresponding to the first light-diffusing groove 13 on the lens bottom surface 11. The lens body 1 is then placed on the substrate, such that the first light-diffusing groove 13 on the lens bottom surface 11 is aligned and bonded to the adhesive on the substrate, thereby securing the lens body 1. As can be seen, in this example, the light distribution of the LED light source can be altered using the lens, and the lens body 1 is aligned and fixed to the substrate using adhesive, thereby sealing the LED light source within the light source cavity 12, isolating the LED light source from the external environment, and thus protecting the LED light source. Therefore, in this example, the existing process of applying adhesive to the LED chip to protect the LED chip is eliminated. In other words, separate adhesive application is not required in this example, and the LED light source can be directly subjected to secondary optical design using the lens. Moreover, the lens body 1 in this example is not formed directly on the LED chip by controlling the volume of silicone at certain points and utilizing the fluidity of silicone, but can be prepared in advance through a unified and standard process. When used, it is aligned and fixed on the substrate in a manner other than the above example. Therefore, the consistency of the light distribution of each LED light source on the LED substrate through the lens can be ensured, thereby improving the overall light output effect.

[0036] In this example, when aligning and fixing the lens, the refractive index of the adhesive used is different from the refractive index of the lens body 1, and the first light diffusion groove 13 diffuses the light reflected thereon. For example, the light reflected from the top surface 10 of the lens to the first light diffusion groove 13 set on the bottom surface 11 of the lens can be diffused (also called astigmatism), thereby improving the light output efficiency and the uniformity of the lens light mixing and light output, thereby further improving the overall light output effect.

[0037] In this embodiment, the specific material of the lens body 1 is not limited; for example, it can be glass, silicone, or acrylic. The specific material of the adhesive is also not limited in this embodiment; as long as the refractive index of the adhesive is different from that of the lens body 1, such that the first light diffusing groove 13 can diffuse the light reflected therefrom, it is sufficient. Furthermore, in this example, the refractive index of the adhesive can be set to be lower than that of the lens body 1, or higher than that of the lens body 1, depending on the specific application requirements.

[0038] In this example, it can be seen from Figure 3 that the light source cavity 12 is an inverted groove, the notch of which is located on the bottom surface 11 of the lens. When the lens is positioned on the substrate, the light source cavity 12 of the lens body 1 is covered on the LED light source. In this example, the lens body 1 and the light source cavity 12 are rotationally symmetrical about the optical axis OO. Due to the limitations of the lens manufacturing process, the lens body 1 and the light source cavity 12 are rotationally symmetrical about the optical axis OO as a whole. In this example, there is no restriction on the specific shape of the light source cavity 12. Of course, in order to further improve the overall light mixing and light output effects of the lens, at least a portion of the inner wall of the light source cavity 12 can be set to a rough surface.

[0039] In this example, the first light diffusion groove 13 arranged around the light source cavity 12 is annular, and the center of the first light diffusion groove 13 can be located on the optical axis OO. Of course, due to the limitations of the manufacturing process, in actual products, the center of the first light diffusion groove 13 may be slightly offset from the optical axis OO.

[0040] As shown in Figures 2 and 3, in this example, to further enhance the light output of the lens, a recessed portion 101 is optionally provided in the central region of the lens top surface 10. This recessed portion 101 is rotationally symmetric about the optical axis OO. The provision of this recessed portion 101 prevents the light emitted by the LED light source from being concentrated in the central region of the lens top surface 10, thereby further enhancing the uniformity of the light output from the lens as a whole.

[0041] In this example, in order to further enhance the light diffusion effect of the first light diffusion groove 13, so that the first light diffusion groove 13 can diffuse the light reflected thereon as fully as possible, the cross-sectional shape of the first light diffusion groove 13 can be set to a triangle or a semicircle. And in this example, there is no specific restriction on the specific shape of the triangle. For example, it can be set to an isosceles triangle, an equilateral triangle, a right triangle, a hypotenuse triangle, etc. according to needs. For example, as shown in FIG3 , the cross-sectional shape of the first light diffusion groove 13 in this example is an isosceles triangle. In other application scenarios of this example, as shown in FIG4 , the cross-sectional shape of the first light diffusion groove 13 is a hypotenuse triangle. And it should be understood that the specific values ​​of the angles of the triangle can determine the inclination of the groove wall of the first light diffusion groove 13. The specific values ​​of the angles of the triangle can be flexibly set according to the specific application scenario, and are not specifically limited here.

[0042] Of course, in this embodiment, the cross-sectional shape of the first light diffusing groove 13 provided on the lens bottom surface 11 is not limited to a triangle or a semicircle. As long as the light diffusing groove 13 performs the aforementioned light diffusing function, the cross-sectional shape of the first light diffusing groove 13 can be flexibly changed based on specific application requirements. Furthermore, the cross-sectional shape of the first light diffusing groove 13 can be a regular shape, such as a trapezoidal shape as shown in FIG5 , an arc shape (specifically, a semicircular shape) as shown in FIG6 , or an irregular shape as required, such as a stepped shape as shown in FIG7 . This embodiment does not impose any specific limitations on this shape.

[0043] In this embodiment, in order to further improve the light control effect of the lens, the first light diffusion groove 13 can be arranged in the light concentration area on the bottom surface 11 of the lens (for example, the first light diffusion groove 13 in each of the above examples can be arranged in the light concentration area on the bottom surface 11 of the lens). The light concentration area is the area where the reflected light received by the bottom surface 11 of the lens (for example, including but not limited to light reflected back from the light output surface of the lens) is most concentrated. It can also be understood that the light concentration area is the area where the amount of reflected light received by the bottom surface of the lens is the strongest, so that the light reflected to the bottom surface 11 of the lens is diffused as much as possible through the first light diffusion groove 11, thereby improving the uniformity of lens light mixing and light output as much as possible.

[0044] In some examples of this embodiment, in order to improve the reliability and sealing performance of the alignment and fixation of the lens on the substrate, as well as to improve the uniformity of the lens light mixing and light output, a glue overflow receiving groove is provided on at least one side of the lens bottom surface 11 located at the first light diffusion groove 13, which is connected to the first light diffusion groove 13. The glue overflow receiving groove is configured to receive the adhesive glue overflowing from the first light diffusion groove 13, thereby preventing the packaging glue overflowing from the first light diffusion groove 13 from being located between the lens bottom surface 11 and the substrate, thereby improving the sealing performance of the lens and the adhesive glue to the LED light source; and the provision of the glue overflow receiving groove can increase the bonding area between the adhesive glue and the lens body 1, thereby improving the reliability of the lens fixed on the substrate. In this example, the first light diffusion groove 13 is provided to be connected to the glue overflow receiving groove, which can facilitate the adhesive glue overflowing from the first light diffusion groove 13 to flow directly into the glue overflow receiving groove. Of course, in some application scenarios, the glue overflow receiving groove can also be provided not to be connected to the first light diffusion groove 13, but to ensure that the glue overflow receiving groove is provided adjacent to the first light diffusion groove 13. For ease of understanding, several examples of setting the overflow glue receiving tank are described below.

[0045] An example of such a configuration is shown in FIG8 . In this example, a first overflow adhesive receiving groove 151 is provided on the outer side of the first light diffusing groove 13 . The first overflow adhesive receiving groove 151 is in communication with the first light diffusing groove 13 , and adhesive overflowing from the first light diffusing groove 13 can flow directly into the first overflow adhesive receiving groove 151 . As can be seen from FIG8 , in this embodiment, the outer side of the first light diffusing groove 13 is the side of the first light diffusing groove 13 that is close to the edge of the lens body.

[0046] Another configuration example is shown in FIG9 . In this example, a second overflow adhesive receiving groove 152 is provided on the inner side of the first light diffusing groove 13 . The second overflow adhesive receiving groove 152 communicates with the first light diffusing groove 13 , allowing adhesive overflowing from the first light diffusing groove 13 to flow directly into the second overflow adhesive receiving groove 152 . As shown in FIG9 , in this embodiment, the inner side of the first light diffusing groove 13 is the side of the first light diffusing groove 13 that is closer to the center of the lens body.

[0047] Another setting example is shown in Figure 13. In this example, a second overflow glue receiving groove 152 is provided on the outer side of the first light diffusion groove 13 and is communicated with the first light diffusion groove 13. A first overflow glue receiving groove 151 is provided on the inner side of the first light diffusion groove 13 and is communicated with the first light diffusion groove 13. The first overflow glue receiving groove 151 and the second overflow glue receiving groove 152 are communicated with each other to form an annular groove. The adhesive overflowing from the first light diffusion groove 13 can directly flow into the first overflow glue receiving groove 151 and the second overflow glue receiving groove 152.

[0048] Another configuration example is shown in Figures 10 to 13, where Figure 13 is a cross-sectional view of lens A2-A2 shown in Figure 12. In this example, a first overflow glue receiving groove 151 and a second overflow glue receiving groove 152 are provided on the left and right sides of the first light diffusing groove 13, and are in communication with the first light diffusing groove 13. In this example, the first light diffusing groove 13, the first overflow glue receiving groove 151, and the second overflow glue receiving groove 152 are all in communication.

[0049] In addition, it should be understood that the overflow glue receiving groove in the above examples also has the function of diffusing the light reflected thereon. Therefore, the light reflected to the bottom surface 11 of the lens can be further diffused through the overflow glue receiving groove, thereby further improving the uniformity of lens light mixing and light output.

[0050] In this embodiment, the cross-sections of the first light diffusing groove 13 and the overflow glue containing groove can be configured to have the same shape, thereby improving the consistency of the light diffusion processing of the first light diffusing groove 13 and the overflow glue containing groove. Of course, it should be understood that in this embodiment, the cross-sections of the first light diffusing groove 13 and the overflow glue containing groove can also be configured to have different shapes, thereby enriching the light distribution effect of the lens.

[0051] In this embodiment, the groove wall of at least one of the first light diffusion groove 13 and the overflow glue receiving groove can be set as a rough surface. The setting of the rough surface can, on the one hand, further increase the bonding area between the adhesive and the lens body, thereby further improving the strength of lens fixation; on the other hand, it can further improve the light diffusion effect and further improve the uniformity of lens light mixing and light output.

[0052] In some other examples of this embodiment, to further enhance the light mixing and light output performance of the lens, as shown in FIG14 , at least one second light diffusing groove 131 is provided on the bottom surface 11 of the lens in the region between the light source cavity 12 and the first light diffusing groove 13 (i.e., inside the first light diffusing groove 13 ), surrounding the light source cavity 12. The second light diffusing groove 131 diffuses the light reflected therefrom. The provision of the second light diffusing groove 131 diffuses the light reflected from the bottom surface 11 of the lens in the region between the light source cavity 12 and the first light diffusing groove 13, thereby further enhancing the uniformity of the light mixing and light output of the lens. Furthermore, in this embodiment, when two or more second light diffusing grooves 131 are provided, the second light diffusing grooves 131 can be nested in sequence, and the centers of the second light diffusing grooves 131 can overlap, and the centers can overlap or not overlap with the center of the first light diffusing groove 13; or the centers of at least a portion of the second light diffusing grooves 131 can overlap.

[0053] In yet other examples of this embodiment, as shown in FIG15 , at least one third light diffusing groove 132 is further provided on the lens bottom surface 11, located between the edge of the lens body 1 and the first light diffusing groove 13 (i.e., outside the first light diffusing groove 13), surrounding the light source cavity 12. The third light diffusing groove 132 diffuses light reflected therefrom. The provision of the third light diffusing groove 132 diffuses light reflected from the lens bottom surface 11 and the first light diffusing groove 13, thereby further improving the uniformity of light mixing and light output from the lens. Furthermore, in this embodiment, when two or more third light diffusing grooves 132 are provided, each third light diffusing groove 132 can be nested in sequence, and the centers of the third light diffusing grooves 132 can overlap, and the centers can overlap or not overlap with the center of the first light diffusing groove 13; or the centers of at least a portion of the third light diffusing grooves 132 can overlap.

[0054] In some other examples of this embodiment, as shown in FIG16 , at least one second light diffusing groove 131 surrounding the light source cavity 12 may be provided in the region of the lens bottom surface 11 between the light source cavity 12 and the first light diffusing groove 13, and at the same time, at least one third light diffusing groove 132 surrounding the light source cavity 12 may be provided in the region of the lens bottom surface 11 between the edge of the lens body 1 and the first light diffusing groove 13. In this example, the light reflected into the region of the lens bottom surface 11 between the light source cavity 12 and the first light diffusing groove 13 and the light reflected into the region between the edge of the lens bottom surface 11 and the first light diffusing groove 13 may be diffused by the second light diffusing groove 131 and the third light diffusing groove 132, respectively.

[0055] It should be understood that in this embodiment, as required, the cross-sectional shapes of the first light diffusion groove 13, the second light diffusion groove 131, and the third light diffusion groove 132 can be the same, or the cross-sectional shapes of at least a portion of the first light diffusion groove 13, the second light diffusion groove 131, and the third light diffusion groove 132 can be different. In this embodiment, when there are multiple second light diffusion grooves 131, the cross-sectional shapes of the multiple second light diffusion grooves 131 can also be set to be the same or different as required. When there are multiple third light diffusion grooves 132, the cross-sectional shape is set in a similar manner and will not be repeated here. In addition, in this embodiment, it can also be set that at least one of the second light diffusion groove 131 and / or the third light diffusion groove 132 has a rough surface. The setting of the rough surface can further enhance the light diffusion effect and further enhance the uniformity of lens light mixing and light output.

[0056] In the above examples of the present embodiment, as shown in Figures 2 to 16, the lens body 1 may further include a lens side surface 14 connecting the lens top surface 10 and the lens bottom surface 11, and in this example, a portion of the light emitted by the LED light source can be emitted through the lens side surface 14. Of course, in some other examples of the embodiment, the lens top surface 10 and the lens bottom surface 11 can also be directly connected, for example, as shown in Figure 17. And the lens bottom surface 11 in the above examples of the present embodiment is flat as a whole, so as to facilitate the flatness and sealing of the lens when it is fixed on the substrate. Of course, the lens bottom surface 11 can be set as a whole according to needs, and it will not be repeated here. It can be seen that the overall shape of the lens body 1 in the present embodiment can be flexibly set according to needs, and it is not limited in the present embodiment.

[0057] This embodiment also provides a light-emitting device, as shown in FIG18 , which includes an LED light source 3 and a lens as described in the above examples. The LED light source 3 is disposed within a light source cavity 12 of a lens body 1 of the lens. Specifically, as shown in FIG18 , the light-emitting device also includes a substrate 2 , on which the LED light source 3 is disposed. The lens body 1 is secured to the substrate 2 via adhesive 4 .

[0058] The LED light source 3 in this embodiment includes an LED chip. For example, in some examples, the LED light source can be an LED chip. This LED chip can be a DBR (Distributed Bragg Reflection) chip with an integrated DBR layer, or a conventional LED chip (also considered a bare chip) without an integrated DBR layer. The light output color of the LED chip in this embodiment can be flexibly configured according to specific application requirements. For example, it can be a blue LED chip, or it can be configured as an ultraviolet LED chip, a green LED chip, a red LED chip, etc., as required. Of course, it can also be configured as a combination of at least two of the various colors of LED chips in the above examples, as required. Of course, in this embodiment, the LED light source can consist solely of LED chips. The LED chips in this embodiment can be differentiated by size, including Mini LED chips, Micro LED chips, or conventional large-size LED chips. Based on the electrode distribution of the LED chips, they can be face-mounted LED chips, flip-chip LED chips, or vertical LED chips. This can be flexibly configured according to application requirements, providing excellent versatility. It can be seen that in this example, the light distribution of the LED chip can be changed by the lens, and the lens body 1 can be aligned and fixed on the substrate by adhesive, so that the LED chip can be completely sealed inside the lens, isolating the LED chip from contact with the external environment, and protecting the LED chip. In this example, the existing process of protecting the LED chip by dispensing glue on the LED chip and changing the light-emitting part of the LED chip is eliminated, that is, in this example, there is no need to perform separate dispensing on the LED chip, and the LED light source can be directly designed for secondary optics through the lens. In addition, the lens body 1 in this example is not formed by directly controlling the volume of the silicone at points on the LED chip and utilizing the fluidity of the silicone, but can be prepared in advance through a unified and standard process, and when used, it can be aligned and fixed on the substrate in a manner including but not limited to the above example, so that the consistency of the light distribution of each LED chip on the LED substrate through the lens can be guaranteed, thereby improving the overall light-emitting effect.

[0059] The light-emitting device provided in this embodiment can be applied to various light-emitting fields. For example, it can be made into a backlight module and applied to the display backlight field (it can be a backlight module for terminals such as televisions, monitors, and mobile phones). Of course, it can also be used as a lighting device according to needs. For example, it can be used for but not limited to home lighting, medical lighting, educational lighting, plant lighting, decorative lighting, traffic lighting, ultraviolet disinfection lighting, and other fields. Of course, the LED device can also be used as a key backlight light source for mobile phones, calculators, keyboards, and other key devices; or it can be made into a flash light for a camera, etc. The above applications are only a few examples of the applications in this embodiment. It should be understood that the application of the light-emitting device in this embodiment is not limited to the several fields exemplified above. The lens design scheme provided by this embodiment not only meets the requirements of a large light output angle of the lens, but also improves the uniformity of the light output brightness of the light-emitting device.

[0060] For ease of understanding, the light emission effect of the lens provided in this embodiment is illustrated below. Referring to FIG. 19 , taking one of the light beams G1 emitted by the LED light source as an example, when the light beam G1 passes through the light incident surface of the lens and reaches the light exit surface, a portion of the light G11 is emitted through the light exit surface, while another portion of the light G12 is reflected to the bottom surface of the lens and specifically to the first light diffusion groove 13 . After being diffused (e.g., reflected or refracted) by the groove wall of the first light diffusion groove 13 , it is emitted through the light exit surface of the lens (e.g., the top surface or side surface of the lens), thereby improving the uniformity of light mixing and light emission from the lens.

[0061] Another example is shown in Figure 20. Taking the light beams G1, G2, and G3 emitted by the LED light source as an example, when the light beams G1, G2, and G3 are emitted from the light incident surface of the lens to the light exit surface, part of the light G11, G21, and G31 are emitted from the light exit surface, and the other part of the light G12, G22, and G32 are reflected to the bottom surface of the lens and specifically reflected to the first light diffusion groove 13 and / or the overflow glue receiving groove, and then diffused (for example, reflected or refracted) through the groove wall of the first light diffusion groove 13 and / or the overflow glue receiving groove, and then emitted through the light exit surface of the lens (for example, the top surface of the lens or the side surface of the lens), thereby improving the uniformity of lens light mixing and light output.

[0062] For ease of understanding, the following describes the distribution of reflected light on the bottom surface of the lens and an example of determining the light concentration area on the bottom surface of the lens. Referring to FIG21 , a schematic diagram of the illumination of reflected light received by the bottom surface of the lens is shown, which represents the illumination distribution of light reflected from the light exiting surface of the lens to the bottom surface of the lens. A partial optical path diagram of reflected light is shown in FIG22 . The area where the bottom surface of the lens receives concentrated reflected light is the light concentration area of ​​the bottom surface of the lens. Referring to FIG23 , a cross-sectional curve of the illumination of reflected light from the bottom surface of the lens is shown, in which the horizontal axis represents the size of the bottom surface of the lens in mm, 0 represents the position of the optical axis OO, and the vertical axis represents the relative intensity of the light reflected from the light exiting surface received by the bottom of the lens. Based on this diagram, the precise coordinate range of the light concentration area on the bottom surface of the lens can be accurately determined. Therefore, providing a first light diffusion groove 13 in this light concentration area can diffuse the light reflected to the light concentration area, thereby greatly improving the uniformity of light mixing and light output from the lens. Furthermore, the lens provided in this embodiment has a simple structure, is easy to manufacture, and has low cost.

[0063] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A lens, characterized in that: The lens has a light-transmissive lens body, the lens body has a lens top surface and a lens bottom surface; the lens bottom surface is provided with a light source cavity for accommodating an LED light source; the lens body has an optical axis, the lens body and the light source cavity are rotationally symmetrical about the optical axis; the inner surface of the light source cavity is configured as a light incident surface of the lens, and the lens top surface is configured as a light emitting surface of the lens; The bottom surface of the lens is also provided with a first light diffusion groove surrounding the light source cavity, and the first light diffusion groove is configured to accommodate adhesive to bond the lens body to the substrate; the refractive index of the adhesive is different from the refractive index of the lens body, and the first light diffusion groove diffuses the light reflected thereon.

2. The lens according to claim 1, wherein: The bottom surface of the lens is located on at least one side of the first light diffusion groove and is further provided with an overflow glue receiving groove communicated with the first light diffusion groove, and the overflow glue receiving groove is configured to receive the adhesive overflowing from the first light diffusion groove.

3. The lens according to claim 2, characterized in that Both sides of the first light diffusion groove are provided with overflow glue containing grooves which are communicated with 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 area on the bottom surface of the lens. The light concentration area is an area where the reflected light received by the bottom surface of the lens 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 diffusion groove is triangular or semicircular.

6. The lens according to any one of claims 1 to 3, characterized in that: The bottom surface of the lens is located in an area between the light source cavity and the first light diffusion groove and is further provided with at least one second light diffusion groove surrounding the light source cavity, and the second light diffusion groove diffuses the light reflected thereon; And / or, at least one third light diffusion groove surrounding the light source cavity is further provided on the bottom surface of the lens in an area between the edge of the lens body and the first light diffusion groove, and the third light diffusion groove diffuses the light reflected thereon.

7. The lens according to any one of claims 1 to 3, characterized in that: The groove wall of the first light diffusion groove is a rough surface.

8. The lens according to claim 6, wherein: The groove wall of the second light diffusion groove and / or the third light diffusion groove is a rough surface.

9. A light emitting device, characterized in that: It comprises an LED light source and the lens as described in any one of claims 1 to 8, wherein the LED light source is arranged in the light source cavity of the lens.

10. The light emitting device according to claim 9, characterized in that: The LED light source includes an LED chip.

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