CN219530659U

CN219530659U - Lens and light-emitting device

Info

Publication number: CN219530659U
Application number: CN202320742530.8U
Authority: CN
Inventors: 许文钦; 吴科进; 孙平如; 闵万里; 谭青青; 郭智才; 吴洁铭; 黄鹏; 刘涛; 庞伟东
Original assignee: Shenzhen Jufei Optoelectronics Co Ltd
Current assignee: Shenzhen Jufei Optoelectronics Co Ltd
Priority date: 2023-03-30
Filing date: 2023-03-30
Publication date: 2023-08-15
Anticipated expiration: 2033-03-30

Abstract

The utility model relates to a lens and a light-emitting device, wherein the lens is provided with a light-permeable lens body, and the lens body is provided with a lens top surface and a lens bottom surface; the bottom surface of the lens is provided with a light source cavity for accommodating the LED light source and a first light diffusion groove surrounding the light source cavity, wherein the first light diffusion groove is configured for accommodating adhesive glue to bond the lens body to the substrate; the light-emitting distribution of the LED light sources is changed through the lenses, the lens body is fixed through the adhesive, the isolation between the LED light sources and the external environment can be ensured, and the lens body can be prepared in advance through a unified and standard process, so that the consistency of the light-emitting distribution of each LED light source through the lenses can be ensured; in addition, the refractive index of the adhesive is different from that of the lens body, and the first light diffusion groove diffuses light reflected to the first light diffusion groove, so that the light-emitting efficiency can be improved, the light mixing and light-emitting uniformity of the lens can be improved, and the overall light-emitting effect can be further improved.

Description

Lens and light-emitting device

Technical Field

The present utility model relates to the field of optics, and in particular, to the field of beam control, and more particularly, to a lens and a light emitting device.

Background

Referring to fig. 1, the current mode of realizing a wide angle of a backlight light source is mainly that a flip-chip blue light LED chip 200 is fixedly crystallized on a PCB board 100, then a silica gel 300 is coated on the blue light LED chip 200, the silica gel 300 coated on the blue light LED chip 200 mainly has two functions, and the first blue light LED chip 200 is isolated from air to play a role of protecting the chip; the second is to change the light distribution of the blue LED chip 200 and optimize the optical effect. According to the scheme, the silica gel 300 is dotted on the blue light LED chip 200, the shaping is realized through the free flow of the silica gel 300, the shaping shape of the silica gel is controlled through controlling the volume of the silica gel dotted out, the consistency of the shaping of the silica gel is poor, and the integral light emitting effect of the backlight light source is poor; and control the fashioned shape of silica gel through the volume of the silica gel that the control point goes out, the fashioned shape of silica gel is simpler, for example can only shape into the arc that fig. 1 shows basically, and the accuse light effect that plays to blue light LED chip 200 is limited, can't realize ideal light type distribution, further influences the light-emitting effect.

Disclosure of Invention

In view of the above-mentioned drawbacks of the related art, an object of the present utility model is to provide a lens and a light emitting device, which are capable of solving the problems of poor uniformity and poor light control effect existing in the prior art by changing the light emitting distribution by dispensing silica gel on an LED chip.

In order to solve the technical problems, the utility model provides a lens, which is provided with a light-permeable lens body, wherein the lens body is provided with a lens top surface and a lens bottom surface; the bottom surface of the lens is provided with a light source cavity for accommodating the LED light source; the lens body is provided with an optical axis, and the lens body and the light source cavity are rotationally symmetrical with the optical axis; the inner surface of the light source cavity is configured as the light incident surface of the lens, and the top surface of the lens is configured as the light emergent 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 for containing bonding glue to bond 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 light reflected to the first light diffusion groove.

In some embodiments of the present utility model, the lens bottom surface is further provided with a glue overflow receiving groove communicating with the first light diffusion groove on at least one side of the first light diffusion groove, the glue overflow receiving groove being configured to receive the adhesive glue overflowed from the first light diffusion groove.

In some embodiments of the present utility model, both sides of the first light diffusion groove are provided with glue overflow accommodating grooves communicated with the first light diffusion groove.

In some embodiments of the utility model, the first light diffusion groove is located in a light concentration area on the bottom surface of the lens, wherein the light concentration area is an area where reflected light received by the bottom surface of the lens is most concentrated.

In some embodiments of the utility model, the first light diffusion groove has a triangular or semicircular cross-sectional shape.

In some embodiments of the present utility model, at least one second light diffusion groove surrounding the light source cavity is further provided in a region of the bottom surface of the lens between the light source cavity and the first light diffusion groove, and the second light diffusion groove diffuses the light reflected thereto;

and/or, the bottom surface of the lens is positioned in the area between the edge of the lens body and the first light diffusion groove, at least one third light diffusion groove surrounding the light source cavity is further arranged in the area, and the third light diffusion groove diffuses the light reflected to the third light diffusion groove.

In some embodiments of the utility model, the groove wall of the first light diffusion groove is a rough surface.

In some embodiments of the utility model, the walls of the second and/or third light diffusion grooves are roughened.

Based on the same inventive concept, the utility model also provides a light emitting device comprising an LED light source and the lens as described above, the LED light source being arranged in the light source cavity of the lens.

Optionally, the LED light source comprises an LED chip.

Advantageous effects

The utility model provides a lens and a light-emitting device, wherein the lens is provided with a light-permeable lens body, and the lens body is provided with a lens top surface and a lens bottom surface; the bottom surface of the lens is provided with a light source cavity for accommodating the LED light source; the lens body and the light source cavity are rotationally symmetrical with each other through the optical axis; the inner surface of the light source cavity is configured as a light incident surface of the lens, the top surface of the lens is configured as a light emergent surface of the lens, at least a part of light emitted by the LED light source arranged in the light source cavity is incident into the transparent body through the inner surface of the light source cavity, and at least a part of the incident light is emitted through the top surface of the lens. A first light diffusion groove surrounding the light source cavity is arranged on the bottom surface of the lens and is configured to contain bonding glue so as to bond the lens body on the substrate; the light-emitting distribution of the LED light source is changed through the lens, and the lens body is fixed through the adhesive, so that the LED light source can be sealed in the light source cavity, the isolation between the LED light source and the external environment can be ensured, and the protection of the LED light source is realized. The lens body is not formed by directly passing through the volume of the silica gel of the control point on the LED chip and utilizing the fluidity of the silica gel, but can be prepared in advance by a unified and standard process, so that the consistency of the light emitting distribution of each LED light source on the LED substrate through the lens can be ensured, and the overall light emitting effect is improved;

the refractive index of the adhesive is different from that of the lens body, and the first light diffusion groove diffuses light reflected to the first light diffusion groove, so that light emitting efficiency can be improved, light mixing and light emitting uniformity of the lens can be improved, and overall light emitting effect can be further improved.

Drawings

FIG. 1 is a schematic diagram of a conventional light emitting device;

FIG. 2 is a schematic diagram of a bottom surface of a first lens structure according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of the lens body A1-A1 of FIG. 2;

FIG. 4 is a schematic cross-sectional view of a second lens structure according to an embodiment of the present utility model;

fig. 5 is a schematic cross-sectional view of a third lens structure according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of a fourth lens structure according to an embodiment of the present utility model;

fig. 7 is a schematic cross-sectional view of a fifth lens structure according to an embodiment of the present utility model;

fig. 8 is a schematic cross-sectional view of a lens structure six according to an embodiment of the present utility model;

FIG. 9 is a schematic cross-sectional view of a lens structure seven according to an embodiment of the present utility model;

fig. 10 is a schematic perspective view of a lens structure eight according to an embodiment of the utility model;

fig. 11 is a schematic perspective view of a lens structure eight according to an embodiment of the utility model;

fig. 12 is a schematic view of a bottom surface of a lens with a lens structure eight according to an embodiment of the present utility model;

FIG. 13 is a schematic cross-sectional view of the lens body A2-A2 of FIG. 12;

fig. 14 is a schematic cross-sectional view of a lens structure eight according to an embodiment of the present utility model;

fig. 15 is a schematic cross-sectional view of a lens structure nine according to an embodiment of the present utility model;

FIG. 16 is a schematic cross-sectional view of a lens structure according to an embodiment of the present utility model;

FIG. 17 is a schematic cross-sectional view of a lens structure eleven according to an embodiment of the present utility model;

fig. 18 is a schematic cross-sectional view of a light emitting device according to an embodiment of the present utility model;

FIG. 19 is a schematic view of a first optical path of a lens light according to an embodiment of the present utility model;

FIG. 20 is a second schematic view of a lens light path according to an embodiment of the present utility model;

FIG. 21 is a schematic view of the illuminance reflected by the bottom surface of a lens without a light diffusion groove according to an embodiment of the present utility model;

FIG. 22 is a schematic view of a lens light path without a light diffusion groove according to an embodiment of the present utility model;

FIG. 23 is a graph showing the profile of the illuminance reflected from the bottom surface of a lens without a light diffusion groove according to an embodiment of the present utility model.

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the utility model. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

The existing LED chip is provided with silica gel to change the light distribution, so that the consistency and the poor light control effect are caused. Based on this, the present utility model is intended to provide a solution to the above technical problem, the details of which will be described in the following examples.

An example of a lens provided in this embodiment is shown in fig. 2 and 3, where fig. 2 is a schematic plan view of the bottom surface of the lens in this example, and fig. 3 is a sectional view taken along A1-A1 in fig. 2. The lens in this example has a light-permeable lens body 1, the lens body 1 having 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 O-O, and the lens body 1 and the light source cavity 12 are rotationally symmetrical about the optical axis O-O; the inner surface of the light source cavity 12 is configured as the light entrance 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 part of the light emitted from the LED light source provided in the light source chamber 12 is incident on the transparent body 1 through the inner surface of the light source chamber 12, and at least a part of the incident light is emitted through the lens top surface 10. In this example, a first light diffusion groove 13 surrounding the light source cavity 12 is further provided in the lens bottom surface 11, and the first light diffusion groove 13 is configured to accommodate an adhesive (not shown in the figure) to adhere the lens body 1 to a substrate (not shown in the figure); that is, when in use, the LED light source can be arranged on the substrate, then the adhesive is arranged on the periphery of the LED light source on the substrate and corresponding to the area of the first light diffusion groove 13 on the bottom surface 11 of the lens, and then the lens body 1 is arranged on the substrate, so that the first light diffusion groove 13 on the bottom surface 11 of the lens is aligned and adhered with the adhesive on the substrate, and the fixation of the lens body 1 is realized. Therefore, in this example, the light distribution of the LED light source can be changed through the lens, and the lens body 1 is aligned and fixed on the substrate through the adhesive, so that the LED light source can be sealed in the light source cavity 12, and the LED light source can be isolated from the external environment, thereby protecting the LED light source. Therefore, the existing technology of protecting the LED chip by dispensing on the LED chip is omitted in the example, namely, in the example, independent dispensing on the LED chip is not needed, and the secondary optical design can be directly carried out on the LED light source through the lens. The lens body 1 in this example is not formed by directly passing through the volume of the silica gel of the control point on the LED chip and utilizing the fluidity of the silica gel, but can be prepared in advance by a unified and standard process, and is aligned and fixed on the substrate in a manner of but not limited to the above example when in use, so that the uniformity of the light emitting distribution of each LED light source on the LED substrate through the lens can be ensured, and the overall light emitting effect is improved.

In this example, when the lens is fixed in alignment, the refractive index of the adhesive glue used is different from that of the lens body 1, and the first light diffusion groove 13 diffuses the light reflected thereon, for example, the light reflected from the lens top surface 10 to the first light diffusion groove 13 provided on the lens bottom surface 11 can be diffused (also referred to as astigmatism), so that the light extraction efficiency can be improved, and the uniformity of the mixed light and the extracted light of the lens can be improved, so that the overall light extraction effect can be further improved.

In the present embodiment, the specific material of the lens body 1 is not limited, and may be, for example, glass, silica gel, or acryl. In this embodiment, the specific material of the adhesive is not limited, as long as the refractive index of the adhesive is different from that of the lens body 1, so that the first light diffusion groove 13 can diffuse the light reflected thereon. In this example, the refractive index of the adhesive may be set smaller than that of the lens body 1 or set larger than that of the lens body 1 according to specific application requirements.

In this example, as can be seen from fig. 3, the light source cavity 12 is an inverted groove, the notch of which is located on the bottom surface 11 of the lens, and when the lens is aligned 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 O-O, limited by the manufacturing process of the lens, including that the lens body 1 and the light source cavity 12 are rotationally symmetrical about the optical axis O-O as a whole. And in this example, the specific shape of the light source cavity 12 is not limited. Of course, in order to further enhance the overall light mixing and light extraction effect of the lens, at least a portion of the inner wall of the light source cavity 12 may be provided with a roughened surface.

In this example, the first light diffusion groove 13 disposed around the light source cavity 12 has a ring shape, and the center of the first light diffusion groove 13 may be located on the optical axis O-O, which is limited by the manufacturing process, and in an actual product, the center of the first light diffusion groove 13 may be slightly offset from the optical axis O-O.

As shown in fig. 2 and 3, in this example, optionally, in order to further enhance the light-emitting effect of the lens, a central region of the lens top surface 10 is further provided with a concave portion 101, and the concave portion 101 may be rotationally symmetrical about the optical axis O-O as a symmetry axis. By providing the concave portion 101, light emitted from the LED light source is prevented from being concentrated and emitted from the central region of the lens top surface 10, and thus the uniformity of the light emitted from the lens as a whole is further improved.

In this example, in order to further enhance the light diffusing effect of the first light diffusing groove 13 so that the first light diffusing groove 13 diffuses light reflected thereto as sufficiently as possible, the cross-sectional shape of the first light diffusing groove 13 may be provided as a triangle or a semicircle. And the specific shape of the triangle in this example may not be particularly limited, and may be set as an isosceles triangle, an equilateral triangle, a right triangle, a hypotenuse triangle, or the like, for example, as required. For example, referring to fig. 3, the cross-sectional shape of the first light diffusion groove 13 in this example is isosceles triangle. In yet other application scenarios of the present example, see fig. 4, the cross-sectional shape of the first light diffusion groove 13 is hypotenuse triangle. It should be understood that the specific value of each angle of the triangle may determine the inclination of the groove wall of the first light diffusion groove 13, and the specific value of each angle of the triangle may be flexibly set according to the specific application scenario, which is not specifically limited herein.

Of course, in the present embodiment, the cross-sectional shape of the first light diffusion groove 13 provided on the bottom surface 11 of the lens is not limited to a triangle or a semicircle, and the cross-sectional shape of the first light diffusion groove 13 can be flexibly replaced according to specific application requirements on the basis of satisfying the above light diffusion function. The cross-sectional shape of the first light diffusion groove 13 may be a regular shape, for example, a trapezoid as shown in fig. 5, an arc (particularly, a semicircle) as shown in fig. 6, or the like, or may be an irregular shape as required, for example, a stepped shape as shown in fig. 7, or the like, which is not particularly limited in this embodiment.

In this embodiment, in order to further enhance the light control effect of the lens, the first light diffusion groove 13 may be disposed in a light concentration area on the bottom surface 11 of the lens (for example, the first light diffusion grooves 13 in the above examples may be all disposed in the light concentration area on the bottom surface 11 of the lens), where the reflected light (for example, including but not limited to the light reflected from the light exit surface of the lens) received by the bottom surface 11 of the lens is most concentrated, or may be understood as an area where the light quantity of the reflected light received by the bottom surface of the lens is strongest, so that as much of the light reflected to the bottom surface 11 of the lens as possible is diffused by the first light diffusion groove 11, thereby enhancing the uniformity of the mixed light and the emitted light of the lens as much as possible.

In some examples of the present embodiment, in order to improve reliability and sealing performance of alignment fixing of the lens on the substrate, and improve uniformity of light mixing and light emitting of the lens. At least one side of the lens bottom surface 11, which is positioned on the first light diffusion groove 13, is also provided with a glue overflow containing groove communicated with the first light diffusion groove 13, and the glue overflow containing groove is configured to contain the bonding glue overflowed from the first light diffusion groove 13, so that the packaging glue overflowed from the first light diffusion groove 13 is prevented from being positioned between the lens bottom surface 11 and the substrate, and the sealing performance of the lens and the bonding glue on the LED light source is improved; and the setting of glue overflow holding tank can promote the bonding area of bonding glue and lens body 1, consequently can promote the reliability that the lens was fixed on the base plate. In this example, the first light diffusion groove 13 is arranged to be communicated with the glue overflow accommodating groove, so that the glue overflowed from the first light diffusion groove 13 can be facilitated to directly flow into the glue overflow accommodating groove. Of course, in some application scenarios, the glue overflow accommodating groove may be provided not to communicate with the first light diffusion groove 13, but to be disposed adjacent to the first light diffusion groove 13. In order to facilitate understanding, several examples of the arrangement of the glue receiving groove are described below.

An example of the arrangement is shown in fig. 8, in which a first glue receiving groove 151 is provided on the outer side of the first light diffusion groove 13, the first glue receiving groove 151 communicates with the first light diffusion groove 13, and the adhesive glue overflowed from the first light diffusion groove 13 can directly flow into the first glue receiving groove 151. Referring to fig. 8, the outer side of the first light diffusion groove 13 in this embodiment is the side of the first light diffusion groove 13 near the edge of the lens body.

Another setting example is shown in fig. 9, in which the inside of the first light diffusion groove 13 is provided with a second glue overflow receiving groove 152, the second glue overflow receiving groove 152 communicates with the first light diffusion groove 13, and the adhesive glue overflowed from the first light diffusion groove 13 can directly flow into the second glue overflow receiving groove 152. Referring to fig. 9, the inner side of the first light diffusion groove 13 in this embodiment is the side of the first light diffusion groove 13 near the center of the lens body.

Another setting example is shown in fig. 13, in this example, the outer side of the first light diffusion groove 13 is provided with a second glue overflow accommodating groove 152 which is communicated with the first light diffusion groove 13, the inner side of the first light diffusion groove 13 is provided with a first glue overflow accommodating groove 151 which is communicated with the first light diffusion groove 13, the first glue overflow accommodating groove 151 and the second glue overflow accommodating groove 152 are communicated to form an annular groove, and the adhesive glue overflowed from the first light diffusion groove 13 can directly flow into the first glue overflow accommodating groove 151 and the second glue overflow accommodating groove 152.

Still another example of arrangement is shown with reference to fig. 10 to 13, wherein fig. 13 is a cross-sectional view of the lens A2-A2 shown in fig. 12. In this example, the left and right sides of the first light diffusion groove 13 are simultaneously provided with a first flash accommodating groove 151 and a second flash accommodating groove 152 which communicate with the first light diffusion groove 13, and in this example, the first light diffusion groove 13, the first flash accommodating groove 151 and the second flash accommodating groove 152 are all communicated.

In addition, it should be understood that the flash accommodating groove in each of the above examples also has a function of diffusing the light reflected thereto, so that the light reflected to the lens bottom surface 11 can be further diffused by the flash accommodating groove, thereby further improving the uniformity of the lens light mixing and light extraction.

In this embodiment, the cross sections of the first light diffusion groove 13 and the glue overflow accommodating groove may be set to be the same, so as to promote consistency of diffusion treatment of the light by the first light diffusion groove 13 and the glue overflow accommodating groove. Of course, it should be understood that in the present embodiment, the first light diffusion groove 13 may be provided to have a different cross-sectional shape from the flash accommodating groove, so as to enrich the light emitting distribution effect of the lens.

In this embodiment, the groove wall of at least one of the first light diffusion groove 13 and the glue overflow accommodating groove may be provided with a rough surface, and the setting of the rough surface may further improve the bonding area between the adhesive and the lens body, so as to further improve the fixing strength of the lens; on the other hand, the diffusion effect of light can be further improved, and the uniformity of light mixing and light emitting of the lens is further improved.

In still other examples of the present embodiment, in order to further enhance the light mixing and light extraction effect of the lens, as shown in fig. 14, at least one second light diffusion groove 131 surrounding the light source cavity 12 is further provided in the region of the lens bottom surface 11 between the light source cavity 12 and the first light diffusion groove 13 (i.e., inside the first light diffusion groove 13), and the second light diffusion groove 131 diffuses the light reflected thereto. By the arrangement of the second light diffusion grooves 131, light reflected to the bottom surface 11 of the lens in the area between the light source cavity 12 and the first light diffusion grooves 13 can be subjected to diffusion treatment, so that the uniformity of light mixing and light emitting of the lens is further improved. In this embodiment, when two or more second light diffusion grooves 131 are provided, each second light diffusion groove 131 may be nested in sequence, and the circle centers of each second light diffusion groove 131 may overlap, and the circle centers may overlap or not overlap with the circle centers of the first light diffusion grooves 13; or at least a part of the center of the second light diffusion groove 131 overlaps.

In still other examples of the present embodiment, as shown in fig. 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 (i.e., outside the first light diffusion groove 13) of the lens bottom surface 11, and the third light diffusion groove 132 diffuses light reflected thereto. By providing the third light diffusion grooves 132, light reflected into the region between the edge of the bottom surface 11 of the lens and the first light diffusion grooves 13 can be diffused, thereby further improving the uniformity of light mixing and light output of the lens. In this embodiment, when two or more third light diffusion grooves 132 are provided, each third light diffusion groove 132 may be nested in sequence, and the circle centers of each third light diffusion groove 132 may overlap, and the circle centers may overlap or not overlap with the circle centers of the first light diffusion grooves 13; or at least a portion of the center of the third light diffusion groove 132 overlaps.

In still other examples of the present embodiment, as shown in fig. 16, at least one second light diffusion groove 131 surrounding the light source cavity 12 may be provided in a region of the lens bottom surface 11 between the light source cavity 12 and the first light diffusion groove 13, and at the same time, at least one third light diffusion groove 132 surrounding the light source cavity 12 may be provided in a region of the lens bottom surface 11 between the edge of the lens body 1 and the first light diffusion groove 13. The light reflected to the lens bottom surface 11 in the region between the light source cavity 12 and the first light diffusion groove 13 and the light reflected to the region between the edge of the lens bottom surface 11 and the first light diffusion groove 13 can be subjected to diffusion processing by the second light diffusion groove 131 and the third light diffusion groove 132, respectively, in this example.

It should be understood that in the present embodiment, the first light diffusion groove 13, the second light diffusion groove 131, and the third light diffusion groove 132 described above may be provided in the same cross-sectional shape as required, or the first light diffusion groove 13, at least a portion of the second light diffusion groove 131, and the third light diffusion groove 132 may be provided in different cross-sectional shapes as required. Also in the present embodiment, when the second light diffusion grooves 131 are provided in plurality, the cross-sectional shapes of the plurality of second light diffusion grooves 131 may be set to be the same or different according to the need. The arrangement of the cross-sectional shapes of the third light diffusion grooves 132 is similar when the third light diffusion grooves are provided in a plurality of numbers, and will not be described again. 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 a rough surface, and the rough surface may further improve the light diffusion effect, and further improve the uniformity of the mixed light and the light output of the lens.

In the above examples of the present embodiment, referring to fig. 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 the present example, a part of the light emitted from the LED light source may be emitted through the lens side surface 14. Of course, in further examples of embodiments, the lens top surface 10 and the lens bottom surface 11 may also be directly connected, for example as shown with reference to fig. 17. And the lens bottom surface 11 in each of the above examples in the present embodiment is entirely planar, thereby facilitating flatness and sealability when the lens is fixed on a substrate. Of course, the lens bottom surface 11 may be disposed entirely or not in a plane according to the requirement, and will not be described here again. It can be seen that the overall shape of the lens body 1 in this embodiment can be flexibly set according to the requirement, and the present embodiment is not limited thereto.

The present embodiment also provides a light emitting device, which includes an LED light source 3, as shown in fig. 18, and a lens as shown in each example above, the LED light source 3 being disposed in a light source cavity 12 of a lens body 1 of the lens. Specifically, referring to fig. 18, the light emitting device further includes a substrate 2, the led light source 3 is disposed on the substrate 2, and the lens body 1 is fixed on the substrate 2 by the adhesive 4.

The LED light source 3 in the present embodiment includes an LED chip. For example, in some examples, the LED light source may be an LED chip, which may be a DBR chip provided with a DBR (Distributed Bragg Reflection, distributed bragg reflection structure) layer integrally, or may be a general LED chip (also understood as a bare chip) provided with no DBR layer integrally. The light emitting color of the LED chip in this embodiment may be flexibly set according to specific application requirements, for example, may be a blue LED chip, or may be set as an ultraviolet LED chip, a green LED chip, a red LED chip, etc. according to requirements. Of course, combinations of at least two of the LED chips including the respective colors of the above examples, and the like may be provided as required. Of course, in the present embodiment, the LED light source may be composed of only the LED chip. The LED chips in this embodiment may be Mini LED chips, micro LED chips or common large-size LED chips from the size, and may be forward-mounted LED chips, flip-chip LED chips or vertical LED chips according to the electrode distribution of the LED chips, which may be flexibly set according to the application requirements, and has good versatility. Therefore, in this example, the light emitting distribution of the LED chip can be changed through the lens, and the lens body 1 is aligned and fixed on the substrate through the adhesive, so that the LED chip can be completely sealed inside the lens, and the LED chip is isolated from contacting with the external environment, so as to protect the LED chip. In this example, the existing technology of protecting the LED chip by dispensing on the LED chip and changing the light emitting portion of the LED chip is removed, that is, in this example, no separate dispensing is required on the LED chip, and the secondary optical design can be directly performed on the LED light source through the lens. In addition, the lens body 1 in this example is not formed by directly passing through the volume of the silica gel of the control point on the LED chip and utilizing the fluidity of the silica gel, but can be prepared in advance by a unified and standard process, and is aligned and fixed on the substrate in a manner of but not limited to the above example when in use, so that the uniformity of the light emitting distribution of each LED chip on the LED substrate through the lens can be ensured, and the overall light emitting effect can be improved.

The light emitting device provided in this embodiment may be applied to various light emitting fields, for example, it may be manufactured into a backlight module applied to a display backlight field (may be a backlight module of a terminal such as a television, a display, a mobile phone, etc.). Of course, it can also be used as a lighting device according to the requirements, for example, but not limited to, household lighting, medical lighting, educational lighting, plant lighting, decorative lighting, traffic lighting, ultraviolet disinfection lighting, and the like. Of course, the LED device can also be used as a key backlight source with key equipment such as a mobile phone, a calculator, a keyboard and the like; or flash lamp of camera. The above-described applications are only a few applications of the example shown in the present embodiment, and it should be understood that the application of the light emitting device in the present embodiment is not limited to the fields of the above-described examples. The lens design scheme provided by the embodiment not only meets the requirement of a large light-emitting angle of the lens, but also improves the uniformity of the light-emitting brightness of the light-emitting device.

In order to facilitate understanding, the following describes an example of the light-emitting effect of the lens provided in this embodiment. Referring to fig. 19, taking one of the light beams G1 emitted from the LED light source as an example, when the light beam G1 is emitted from the light incident surface to the light emergent surface of the lens, a part of the light beam G11 is emitted from the light emergent surface, and another part of the light beam G12 is reflected to the bottom surface of the lens and is specifically reflected to the first light diffusion groove 13, and is diffused (e.g. reflected or refracted) by the groove wall of the first light diffusion groove 13 and then is emitted from the light emergent surface (e.g. the top surface or the side surface of the lens) of the lens, thereby improving the uniformity of the mixed light and the emitted light of the lens.

As another example, referring to fig. 20, taking the light beams G1, G2, G3 emitted by the LED light source as an example, when the light beams G1, G2, G3 are emitted to the light emitting surface through the light incident surface of the lens, a part of the light beams G11, G21, G31 are emitted through the light emitting surface, and another part of the light beams G12, G22, G32 are reflected to the bottom surface of the lens and specifically reflected to the first light diffusion groove 13 and/or the glue overflow accommodating groove, are diffused (e.g. reflected or refracted) by the groove wall of the first light diffusion groove 13 and/or the glue overflow accommodating groove, and are then emitted through the light emitting surface (e.g. the top surface or the side surface of the lens) of the lens, thereby improving the uniformity of the mixed light and the emitted light of the lens.

For ease of understanding, a description will be given below of a distribution of reflected light on the lens bottom surface and a determination example of a light concentration region on the lens bottom surface. Referring to fig. 21, a schematic diagram of illuminance of reflected light received by the bottom surface of the lens is shown, which shows the illuminance distribution of light reflected from the light exit surface of the lens to the bottom surface of the lens, and the light path diagram of part of the reflected light is shown in fig. 22, where the area of the bottom surface of the lens where the reflected light is received intensively is a light concentrating area of the bottom surface of the lens. Referring to fig. 23, an abscissa represents the size of the bottom surface of the lens, and 0 represents the position of the optical axis O-O, and an ordinate represents the relative intensity of the light reflected from the light exit surface received by the bottom of the lens; according to the image, the precise coordinate range of the light concentration area on the bottom surface of the lens can be accurately determined, so that the first light diffusion groove 13 is arranged in the light concentration area to diffuse the light reflected to the light concentration area, and the uniformity of light mixing and light emitting of the lens is improved to a great extent. The lens provided by the embodiment is simple in structure, easy to manufacture and low in cost.

It is to be understood that the utility model is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.

Claims

1. A lens, wherein the lens has a light transmissive lens body having a lens top surface and a lens bottom surface; the bottom surface of the lens is provided with a light source cavity for accommodating the LED light source; the lens body is provided with an optical axis, and the lens body and the light source cavity are rotationally symmetrical with the optical axis; the inner surface of the light source cavity is configured as the light incident surface of the lens, and the top surface of the lens is configured as the light emergent surface of the lens;

2. The lens of claim 1, wherein the lens bottom surface is further provided with a glue overflow receiving groove in communication with the first light diffusing groove on at least one side of the first light diffusing groove, the glue overflow receiving groove configured to receive the glue overflowed from the first light diffusing groove.

3. The lens of claim 2, wherein both sides of the first light diffusion groove are provided with flash accommodating grooves communicating with the first light diffusion groove.

4. A lens according to any one of claims 1 to 3 wherein the first light diffusing groove is located in a light concentrating region on the bottom surface of the lens, the light concentrating region being the region where reflected light received by the bottom surface of the lens is most concentrated.

5. A lens according to any one of claims 1 to 3, wherein the first light diffusion groove has a triangular or semicircular cross-sectional shape.

6. A lens according to any one of claims 1 to 3, wherein at least one second light diffusion groove surrounding the light source cavity is further provided in a region of the lens bottom surface between the light source cavity and the first light diffusion groove, and the second light diffusion groove diffuses light reflected thereto;

7. A lens according to any one of claims 1 to 3, wherein the walls of the first light diffusing groove are roughened.

8. The lens of claim 6, wherein the walls of the second light diffusing groove and/or the third light diffusing groove are roughened.

9. A light emitting device comprising an LED light source and the lens of any one of claims 1-8, the LED light source being disposed in the light source cavity of the lens.

10. The light emitting device of claim 9, wherein the LED light source comprises an LED chip.