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 邢美正 许文钦 姚亚澜 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,包括具有形状相对于中心光轴对称的球面透镜部的透镜,球面透镜部包括设于透镜的顶表面的中心位置处的第一凹部,以及设于光学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,在第一凹部位置上还设置有至少一个基于顶表面内凹的第一条形槽,将其经过第一条形槽上的光线折射至与其他光线进行混光,通过在出光面上设计第一条形槽的方式增加出光面对光线的折射交叉率,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,解决了现有的发光装置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 a lens with a spherical lens part which is symmetrical relative to a central optical axis in shape, wherein the spherical lens part comprises a first concave part arranged at the central position of the top surface of the lens and a second concave part arranged at the central position of the bottom surface of the optical lens, the second concave part is formed by sinking the bottom surface of the lens towards the top surface direction, at least one first strip-shaped groove based on the inner concave of the top surface is also arranged at the position of the first concave part, the first strip-shaped groove refracts light passing through the first strip-shaped groove to be mixed with other light, the refraction cross rate of the light from a light emergent surface to the light is increased by designing the first strip-shaped groove on the light emergent surface, thereby improving the distribution uniformity degree of the emergent light, improving the final display brightness of the light and the uniformity degree of the display color of the light, and solving the problem that the light, and the brightness and color of light do not show uniformity.)

1. An optical lens, comprising: a spherical lens portion having a symmetrical shape with respect to a central optical axis, and a support pillar provided on a bottom surface of the optical lens to support the optical lens;

the spherical lens portion 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 top surface direction based on a bottom surface of the optical lens; at least one first bar-shaped groove based on the inner recess of the top surface is further arranged at the position of the first concave part, and under the action of the first bar-shaped groove, light rays passing through the first bar-shaped groove are refracted to be mixed with other light rays.

2. The optical lens according to claim 1, wherein a first convex portion is further disposed at a top center position of the second concave portion, and light emitted from the light emitting device is incident on the first convex portion, and then is mixed for a plurality of times by the first convex portion and refracted onto the top surface.

3. The optical lens of claim 2, wherein at least one second groove is formed on the second concave portion on a side thereof adjacent to the first convex portion, the second groove being concave toward the top surface.

4. The optical lens of claim 3, wherein the first and/or second stripe-shaped grooves are V-shaped grooves, and an included angle of bottoms of the V-shaped grooves is greater than 90 degrees.

5. The optical lens of any one of claims 1-4, wherein the second recess formed by recessing the bottom surface of the optical lens in the direction of the top surface is U-shaped and forms a semi-enclosed 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.

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 5, 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 15, 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 light-emitting apparatus according to claim 16 or 17, 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 backlight and LED illumination, in particular to an optical lens and a light-emitting device thereof.

Background

In the traditional light-emitting device, a bell-shaped light-in surface is arranged on a lens cup to change the light emitted from a light-emitting device from point light to surface light, specifically, the light is firstly refracted and dispersed for the first time through the light-in surface and then refracted and dispersed for the second time through the light-out surface of the lens cup to realize the surface diffusion of the light of a point light source, however, the light-out surface of the existing lens cup is designed by adopting a cambered surface, the design ensures that the included angle between the light and the light changes along with the change of radian, and the change of the device can cause the light to be not uniform after the light is diffused and refracted, thereby causing the light color displayed after the light is irradiated on a receiving surface to be dark, the overall brightness is not very bright, so that only one lens structure capable of realizing the surface light of the point light source and ensuring the uniform distribution after the light is refracted is needed to solve the problems, the problem that after light is refracted in the existing lens, the light distribution is uneven, so that the luminance brightness and the display color in the display area are relatively dark is caused.

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.

To solve the above technical problem, an embodiment of the present invention provides an optical lens, including: a spherical lens portion having a symmetrical shape with respect to a central optical axis, and a support pillar provided on a bottom surface of the optical lens to support the optical lens;

the spherical lens portion 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 top surface direction based on a bottom surface of the optical lens; at least one first bar-shaped groove based on the inner recess of the top surface is further arranged at the position of the first concave part, and under the action of the first bar-shaped groove, light rays passing through the first bar-shaped groove are refracted to be mixed with other light rays.

Furthermore, a first convex part is further arranged at the center of the top of the second concave part, and after light emitted by the light emitting device irradiates the first convex part, the light is mixed for multiple times under the action of the first convex part and then is refracted onto the top surface.

Furthermore, at least one second strip-shaped groove which is concave towards the direction of the top surface is arranged on one side of the second concave part close to the first convex part.

Further, first bar groove and/or second bar groove are the V-arrangement groove, just the bottom contained angle of V-arrangement groove is greater than 90 degrees.

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 U-shaped, and a semi-closed cavity is formed on the optical lens together with 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 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 an increase of 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 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 lens with a spherical lens part which is symmetrical relative to a central optical axis in shape, the spherical lens part comprises a first concave part which is arranged at the central position of the top surface of the optical lens and a second concave part which 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, at least one first strip-shaped groove which is concave based on the top surface is also arranged at the position of the first concave part, under the action of the first strip-shaped groove, the light passing through the first strip-shaped groove is refracted to be mixed with other light, the refraction cross rate of the light from the light emergent surface to the light is increased by designing the first strip-shaped groove on the light emergent surface, so that the distribution uniformity degree of the emergent light is improved, the final display brightness of the light and the uniformity of the display color are improved, and the problem that the light is not uniformly distributed after being refracted by the conventional light-emitting device, so that the brightness and the color of the light are not uniformly displayed is solved.

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 an enlarged view of portion F of FIG. 3;

FIG. 5 is a schematic view of light refraction in a first linear groove;

FIG. 6 is a schematic diagram of a third structure of an optical lens according to an embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating a distribution of refracted light rays of an optical lens according to an embodiment of the present invention;

FIG. 8 is a perspective view of an optical lens provided by an embodiment of the present invention;

FIG. 9 is another perspective view of an optical lens provided by an embodiment of the invention;

FIG. 10 is a schematic structural diagram of an optical lens provided in an embodiment of the present invention;

FIG. 11 is a schematic diagram of a third structure of an optical lens according to an embodiment of the invention;

fig. 12 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.