阅读说明：本技术 一种光学透镜及其发光装置 (Optical lens and light-emitting device thereof ) 是由 许文钦 姚亚澜 邢美正 于 2018-09-07 设计创作，主要内容包括：本发明实施例提供的光学透镜及其发光装置,该光学透镜包括形状相对于中心光轴对称的光学结构,光学结构包括第一凹部和第二凹部,设于透镜的顶表面的中心位置处的第一凹部,以及设于透镜的底表面的中心位置处的第二凹部,其中第二凹部由基于透镜的底表面向顶表面方向上凹陷形成,光学透镜的纵截面的顶边,为由多个线条依次连接组成,发光器件射出的光线在穿过由由多个线条依次连接旋转得到的顶表面时被折射至与穿过其他线条所形成的面的光线进行混合,从而提高了射出光线的分布均匀程度,提高了光线的最终显示亮度以及显示颜色的均匀程度,解决了现有的透明罩杯折射后光线分布不均匀,而导致光的亮度和颜色也不显示均匀的问题。(The optical lens and the light emitting device thereof provided by the embodiment of the invention comprise an optical structure which is symmetrical relative to a central optical axis in shape, wherein the optical structure comprises a first concave part and a second concave part, the first concave part is arranged at the central position of the top surface of the lens, and the second concave part is arranged at the central position of the bottom surface of the lens, the second concave part is formed by sinking the bottom surface of the lens towards the top surface direction, the top edge of the longitudinal section of the optical lens is formed by connecting a plurality of lines in sequence, light emitted by the light emitting device is refracted to be mixed with light passing through the surface formed by other lines when passing through the top surface obtained by connecting and rotating the plurality of lines in sequence, so that the distribution uniformity degree of the emitted light is improved, the final display brightness and the uniformity degree of display color of the light are improved, and the problem of uneven light distribution after the refraction of the existing transparent cup is solved, and the brightness and color of light do not show uniformity.)

1. An optical lens, comprising: the optical structure is symmetrical relative to a central optical axis, and the supporting column is arranged on the bottom surface of the optical lens and used for supporting the optical lens;

the optical structure includes a first concave portion provided at a center position of a top surface of the optical lens, and a second concave portion provided at a center position of a bottom surface of the optical lens, wherein the second concave portion is formed by being depressed in a direction toward the top surface based on a bottom surface of the optical lens; the top edge of the longitudinal section of the optical lens is formed by sequentially connecting a plurality of lines, and the lines comprise at least one of straight lines, curved lines and arc lines.

2. The optical lens of claim 1 wherein the second recess formed by the bottom surface of the lens recessed in the direction of the top surface is U-shaped and forms a semi-enclosed cavity with the bottom surface of the lens in the lens, the cavity having a cross-sectional radius larger than the cross-sectional radius of the light emitting device.

3. The optical lens according to claim 2, wherein a first convex portion that is convex outward based on the top surface is provided on a central position of the first concave portion.

4. The optical lens of claim 3, wherein a second convex portion is further provided in the second concave portion at a position opposite to the first convex portion.

5. The optical lens of claim 2, further comprising a relief structure on a bottom surface of the optical lens for diffusing the emitted light reflected by the top surface.

6. The optical lens of claim 5 wherein a ratio of a maximum depth of the first recess to a maximum thickness of the optical lens is in a range of 0.08 to 0.12;

a ratio of a maximum width of the first concave portion to a maximum width of the optical lens is in a range of 0.2 to 0.4.

7. The optical lens of claim 6 wherein a ratio of a maximum width of the second recess to a maximum width of the first recess is in a range of 0.6 to 0.75.

8. The optical lens of claim 7 wherein a ratio of a maximum depth of the second recess to a maximum thickness of the optical lens is in a range of 0.65 to 0.9;

a ratio of a maximum width of the second concave portion to a maximum width of the optical lens is in a range of 0.18 to 0.3.

9. The optical lens of claim 8, wherein a first diffusion layer is further disposed on a side surface of the optical lens, and a ratio of a height of the first diffusion layer to a maximum height of the optical lens is in a range of 0.2 to 0.6.

10. The optical lens of any of claims 1-9, wherein the first diffusion layer is comprised of a plurality of irregular asperities or a plurality of diffusion cells; wherein the first diffusion layer is integrally formed with a side surface of the optical lens.

11. The optical lens of claim 10, further comprising a second diffusion layer disposed on a bottom surface of the optical lens, wherein the second diffusion layer is composed of a plurality of irregular prominence and depression structures or a plurality of diffusion cells; wherein the second diffusion layer is integrally formed with a bottom surface of the optical lens.

12. The optical lens of claim 12 wherein the orthogonal cross-sectional shape of the diffusion cell in a direction parallel to the reference optical axis of the optical lens is a triangular shape or a square shape or a semicircular shape; the diffusion grids are in the shape of a regular square grid, a triangular grid or a hexagonal grid.

13. A light-emitting apparatus, comprising a PCB board, at least one light-emitting device disposed on the PCB board, and at least one optical lens according to any one of claims 1 to 12; the optical lens covers and fixes one or more light-emitting devices on the PCB board, and light emitted by the light-emitting devices is uniformly scattered.

14. The lighting device according to claim 13, wherein the PCB board further has a positioning groove for engaging with the supporting pillar of the optical lens, and the optical lens is fixed on the PCB board by the engagement of the positioning groove and the supporting pillar.

15. The light-emitting apparatus according to claim 13 or 14, wherein a distance from the light-emitting device to the first convex portion is a first distance D1, the first distance D1 decreases with an increase in an included angle α 1, the included angle α 1 is an included angle between the first distance D1 and the central optical axis, 0 ≦ α 1 ≦ β 1, and β 1 ≦ α 1 ≦ pi/2.

Technical Field

The invention relates to the technical field of LED backlight and illumination, in particular to an optical lens and a light-emitting device thereof.

Background

In the traditional light-emitting device, as the light incident surface with a bell shape is arranged on the lens cup to change the light emitted from the light-emitting device from point light to surface light, specifically, the light is firstly diffused by the first refraction of the light incident surface and then is refracted by the light emergent surface of the lens cup for the second time to diffuse and refract, thereby realizing the surface diffusion of the light of the point light source, however, the light emergent surface of the existing lens cup is designed by adopting a cambered surface, the design can enlarge the included angle between the light and the light, simultaneously, the light can be uniformly distributed after the light is diffused and refracted, especially, the light at the middle part of the lens cup can be outwardly refracted, thereby causing the light color displayed at the middle part and the periphery to be dark, therefore, only one lens structure which can realize the surface light of the point light source and ensure the uniform distribution after the light is refracted is needed to solve the problems, the existing lens can cause the problems of darker brightness and display color in the display area after refracting light.

Disclosure of Invention

The embodiment of the invention provides an optical lens and a light-emitting device thereof, and mainly solves the technical problem that the light distribution of the existing light-emitting device is uneven in the process of refracting the light emitted by a light-emitting device, so that the light brightness and the display color are uneven.

In order to solve the above technical problem, an embodiment of the present invention provides an optical lens, where the optical lens includes an optical structure having a symmetrical shape with respect to a central optical axis, and a supporting pillar disposed on a bottom surface of the optical lens for supporting the optical lens;

the optical structure comprises a first concave part arranged at the center of the top surface of the optical lens and a second concave part arranged at the center of the bottom surface of the optical lens, wherein the second concave part is formed by sinking towards the top surface direction based on the bottom surface of the optical lens, the top edge of the longitudinal section of the optical lens is formed by connecting a plurality of lines in sequence, and the lines comprise at least one of straight lines, curved lines and arc lines.

Further, the second concave part formed by the bottom surface of the optical lens in a concave mode towards the direction of the top surface is in a U-shaped mode, a semi-closed cavity is formed on the optical lens and the bottom surface of the optical lens, and the cross-sectional radius of the cavity is larger than that of the light-emitting device.

Further, a first convex portion protruding outward based on the top surface is provided on a central position of the first concave portion.

Further, a second convex portion is provided in the second concave portion at a position opposite to the first convex portion.

Further, a concave-convex structure is arranged on the bottom surface of the optical lens, and the concave-convex structure is used for diffusing the emergent light reflected by the top surface.

Further, a ratio of a maximum depth of the first recess to a maximum thickness of the optical lens is in a range of 0.08 to 0.12;

a ratio of a maximum width of the first concave portion to a maximum width of the optical lens is in a range of 0.2 to 0.4.

Further, a ratio of a maximum width of the second concave portion to a maximum width of the first concave portion ranges from 0.6 to 0.75.

Further, a ratio of a maximum depth of the second recess to a maximum thickness of the optical lens is in a range of 0.65 to 0.9;

a ratio of a maximum width of the second concave portion to a maximum width of the optical lens is in a range of 0.18 to 0.3.

Further, a first diffusion layer is further disposed on a side surface of the optical lens, and a ratio of a height of the first diffusion layer to a maximum height of the optical lens is in a range of 0.2 to 0.6.

Further, the first diffusion layer is composed of a plurality of irregular prominence and depression structures or a plurality of diffusion grids; wherein the first diffusion layer is integrally formed with a side surface of the optical lens.

Further, a second diffusion layer is arranged on the bottom surface of the optical lens, wherein the second diffusion layer is composed of a plurality of irregular convex-concave structures or a plurality of diffusion grids; wherein the second diffusion layer is integrally formed with a bottom surface of the optical lens.

Further, the orthogonal cross-sectional shape of the diffusion lattice in the direction parallel to the reference optical axis of the optical lens is a triangular shape, a square shape, or a semicircular shape; the diffusion grids are in the shape of a regular square grid, a triangular grid or a hexagonal grid.

In order to solve the technical problem, an embodiment of the present invention further provides a light emitting device, which includes a PCB, at least one light emitting device disposed on the PCB, and at least one optical lens as described above; the optical lens covers and fixes one or more light-emitting devices on the PCB board, and light emitted by the light-emitting devices is uniformly scattered.

Furthermore, the PCB board is also provided with a limiting groove matched with the supporting column of the optical lens, and the optical lens is fixed on the PCB board through the matching of the limiting groove and the supporting column.

Further, the distance from the light emitting device to the first convex portion is a first distance D1, the first distance D1 decreases with the increase of an included angle α 1, the included angle α 1 is the included angle between the first distance D1 and the central optical axis, 0 is equal to or greater than α 1 and equal to or less than β 1, and β 1 is equal to or greater than α 1 and is less than pi/2.

The invention has the beneficial effects that:

according to the optical lens and the light emitting device thereof provided by the embodiment of the invention, the optical lens comprises an optical structure which is symmetrical relative to a central optical axis in shape, the optical structure comprises a first concave part and a second concave part, the first concave part is arranged at the central position of the top surface of the optical lens, and the second concave part is arranged at the central position of the bottom surface of the optical lens, wherein the second concave part is formed by being concave towards the top surface direction based on the bottom surface of the optical lens, the top side of the longitudinal section of the optical lens is formed by connecting a plurality of lines in sequence, the light emitted by the light emitting device is refracted to be mixed with the light passing through the surfaces formed by other lines when passing through the top surface obtained by connecting and rotating a plurality of lines in sequence, so that the refraction angle of each line facing the light is different, and the light on the adjacent surfaces can be mutually crossed and mixed after being refracted, thereby improved the even degree of distribution of the light that jets out, improved the final display luminance of light and the even degree that shows the colour, solved current transparent cup refraction back light and distributed inhomogeneously, and led the luminance of light and the even problem of colour also not showing.

Furthermore, the top surface is obtained by adopting a design mode of a plurality of lines, so that the effect of simplifying the processing technology is achieved in the production of the top surface, the production efficiency is improved, and meanwhile, the use experience of a user is greatly improved due to the design of the top surface.

Drawings

Fig. 1 is a schematic structural diagram of a light-emitting device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an optical lens according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a second structure of an optical lens according to an embodiment of the invention;

FIG. 4 is a schematic diagram illustrating a distribution of refracted light rays of an optical lens according to an embodiment of the present invention;

FIG. 5 is a perspective view of an optical lens provided by an embodiment of the invention;

FIG. 6 is another perspective view of an optical lens provided by an embodiment of the invention;

FIG. 7 is a schematic view of another optical lens structure provided in an embodiment of the present invention;

FIG. 8 is a schematic diagram of a third structure of an optical lens according to an embodiment of the invention;

fig. 9 is a schematic diagram of a fourth structure of an optical lens according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.