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 姚亚澜 许文钦 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,该光学透镜设有形状相对于中心光轴对称的光学结构,所述光学结构包括第一凹部和第二凹部,设于所述光学透镜的顶表面的中心位置处的第一凹部,以及设于所述光学透镜的底表面的中心位置处的第二凹部,其中所述第二凹部由基于所述光学透镜的底表面向顶表面方向上凹陷形成,并在所述第二凹部中与所述第一凹部相对应的位置上设有与所述第一凹部的内凹方向相同的第二凸部,通过在第二凹部的入光面上设置第二凸部,该第二凸部可以将折射到此处的射出光折射至与其他射出光的轨道上进行混光,通过该第二凸部的折射后,解决了现有的发光装置的中间区域的光线分布不均匀,而导致光的亮度也不均匀的问题。(The optical lens and the light emitting device thereof provided by the embodiment of the invention are provided with 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 sinking towards the top surface direction based on the bottom surface of the optical lens, a second convex part which is the same as the concave direction of the first concave part is arranged at the position corresponding to the first concave part in the second concave part, the second convex part is arranged on the light inlet surface of the second concave part, the second convex part can refract the refracted light to the track of other refracted light for light mixing, and the uneven light distribution of the middle area of the existing light emitting device is solved after the refraction of the second convex part, and the brightness of the light is also not uniform.)

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, and a second convex portion having the same concave direction as that of the first concave portion is provided in a position corresponding to the first concave portion among the second concave portion.

2. The optical lens of claim 1, wherein the second recess formed by recessing the bottom surface of the optical lens in the direction of the top surface has a U-shape, and forms a semi-closed cavity with the bottom surface of the optical lens on the optical lens, the cross-sectional radius of the cavity being larger than the cross-sectional radius of the light emitting device.

3. The optical lens of claim 2 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.

4. An optical lens as claimed in claim 3, characterized in that the ratio of the maximum width of the first recess to the maximum width of the optical lens is in the range of 0.2 to 0.4.

5. The optical lens of claim 2 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.

6. The optical lens of claim 5 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.

7. The optical lens of claim 6 wherein a ratio of a maximum width of the second recess to a maximum width of the optical lens is in a range of 0.18 to 0.3.

8. An optical lens as claimed in any one of claims 1 to 7, characterized in that the maximum dimension of the optical lens is between 10mm and 23 mm.

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 claim 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 wherein the orthogonal cross-sectional shape of the diffusion grid to a direction perpendicular to a center normal of the optical lens is triangular or square or semi-circular; the diffusion grids are in the shape of a regular square grid, a triangular grid or a hexagonal grid.

12. The optical lens of claim 11, 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.

13. 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.

14. The optical lens of claim 3 wherein the optical lens is fabricated from at least one of polymethylmethacrylate plastic, vinyl silicone, PC plastic, PMMA acrylic, and glass.

15. 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 14; 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.

16. The lighting device according to claim 16, 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.

17. The optical lens of claim 15 or 16, wherein the distance from the light emitting device to the second 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 of the first distance D1 to the central optical axis, 0 ≦ α 1 ≦ β 1, β 1 ≦ α 1 < π/2.

Technical Field

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

Background

In the conventional light emitting device, a bell-shaped light incident surface is disposed on a cup serving as a lens to change light emitted from a light emitting device from point light to surface light, specifically, after the light is first refracted and dispersed by an incident surface, then the light-emitting surface of the lens cup refracts to perform the second divergent refraction so as to realize the surface diffusion of the light of the point light source, however, the refraction structure of the existing lens cup is not uniform for the diffusion and refraction of light, especially for the light brightness of the middle part of the lens cup is much darker than that of the periphery, at this time, the light rays in the middle of the lens cup are refracted to the periphery, so that the light rays in the middle are dark, therefore, the problem of low brightness in the middle area after diffusion and refraction is solved by only one lens structure which can realize surface emission of a point light source and ensure uniform distribution of light after refraction.

Disclosure of Invention

The embodiment of the invention provides an optical lens and a light-emitting device thereof, and mainly solves the technical problems that in the existing light-emitting device, due to the structure of a lens cup, light rays emitted by a light-emitting device covered in the light-emitting device are not uniformly distributed after being refracted, and the brightness of the light rays in the middle is low and dark.

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 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, and a second convex portion having the same concave direction as that of the first concave portion is provided in a position corresponding to the first concave portion among the second concave portion.

In another embodiment of the present invention, the second concave portion formed by recessing the bottom surface of the optical lens in the direction of the top surface is U-shaped, and forms a semi-closed cavity on the optical lens together with the bottom surface of the optical lens, wherein the radius of the cross section of the cavity is larger than that of the light emitting device.

In another embodiment of the present invention, 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.

In another embodiment of the present invention, a ratio of the maximum width of the first recess to the maximum width of the optical lens is in a range of 0.2 to 0.4.

In another embodiment of the present invention, a ratio of the maximum width of the second concave portion to the maximum width of the first concave portion is in a range of 0.6 to 0.75.

In another embodiment of the present invention, 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.

In another embodiment of the present invention, a ratio of the maximum width of the second concave portion to the maximum width of the optical lens is in a range of 0.18 to 0.3.

In another embodiment of the invention, the maximum dimension of the optical lens is 10mm to 23 mm.

In another embodiment of the present invention, 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.

In another embodiment of the present invention, the first diffusion layer is composed of a plurality of irregular prominence and depression structures or a plurality of diffusion cells; wherein the first diffusion layer is integrally formed with a side surface of the optical lens.

In another embodiment of the present invention, the orthogonal cross-sectional shape of the diffusion cell to the perpendicular direction to the center normal 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.

In another embodiment of the present invention, a second diffusion layer is further disposed 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 lattices; wherein the second diffusion layer is integrally formed with a bottom surface of the optical lens.

In another embodiment of the present invention, 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 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.

In another embodiment of the present invention, the optical lens is made of at least one material selected from the group consisting of polymethyl methacrylate plastic, vinyl silicone, PC plastic, PMMA acrylic, and glass.

In order to solve the technical problem, the invention further provides a light-emitting device, which comprises a PCB board, at least one light-emitting device arranged on the PCB board, 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.

In another embodiment of the present invention, the PCB board is further provided with a position-limiting groove mutually engaged with the supporting pillar of the optical lens, and the optical lens is fixed on the PCB board by the mutual engagement of the position-limiting groove and the supporting pillar.

In another embodiment of the invention, the distance from the light emitting device to the second convex part 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 ≦ α 1 ≦ β 1, β 1 ≦ α 1 < π/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 present invention, the optical lens is provided with the optical structure having the symmetrical shape with respect to the central optical axis, the optical structure includes the first concave portion and the second concave portion, the first concave portion provided at the central position of the top surface of the optical lens, and the second concave portion provided at the central position of the bottom surface of the optical lens, wherein the second concave portion is formed by being depressed in the top surface direction based on the bottom surface of the optical lens, and the second convex portion having the same concave direction as the first concave portion is provided at the position corresponding to the first concave portion in the second concave portion, by providing the second convex portion on the light incident surface of the second concave portion, the second convex portion can refract the outgoing light refracted there to the track of the other outgoing light for light mixing, and after being refracted by the second convex portion, the problem of current light emitting device's middle zone light distribution inhomogeneous, and lead to the luminance of light also inhomogeneous is solved.

Furthermore, in the invention, the central position of the top surface of the optical lens is further provided with the first concave part, the arrangement position of the first concave part corresponds to the arrangement position of the second convex part, and the first concave part can realize that the emergent light is refracted again to change the emergent direction when being emitted from the optical lens.

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 an enlarged view of portion A of FIG. 4;

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

FIG. 7 is a schematic structural diagram of an optical lens according to 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.