CN110630983A

CN110630983A - Lens and light-emitting component using same

Info

Publication number: CN110630983A
Application number: CN201910857730.6A
Authority: CN
Inventors: 姜君城
Original assignee: SHENZHEN BAIKANG PHOTOELECTRIC CO Ltd
Current assignee: SHENZHEN BAIKANG PHOTOELECTRIC CO Ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2019-12-31

Abstract

The invention relates to the technical field of optics, in particular to a lens, which comprises an incident surface and an emergent surface which are oppositely arranged, wherein the incident surface comprises a plurality of first lens areas which are concentrically arranged around the axis of the lens, the emergent surface comprises a plurality of second lens areas which are concentrically arranged around the axis of the lens, light rays enter the lens from the incident surface, one part of the light rays are directly emitted from the emergent surface, and the other part of the light rays are emitted from the second lens areas after being totally reflected by the first lens areas, so that the focal length and the caliber required for obtaining the same effect are smaller, the thickness and the caliber of the lens can be reduced, namely the size of the lens is reduced, the weight of the lens is reduced, and the size and the weight of a light condensing assembly using the lens can be reduced, so that the light condensing assembly can be suitable for more application scenes.

Description

Lens and light-emitting component using same

Technical Field

The invention relates to the technical field of optics, in particular to a lens.

Background

Fresnel lenses (Fresnel lenses), also known as screw lenses, are mostly sheets of polyolefin material that are injection-molded, and are also made of glass, one surface of the lens is smooth, and the other surface is inscribed with concentric circles from small to large, and the texture of the lens is designed according to the requirements of light interference and interference, relative sensitivity and receiving angle. Most of Fresnel lenses used in the existing light-gathering component are lenses with single-sided sawtooth structures, namely, an incident surface is a plane structure, an emergent surface is a tooth groove structure with a plurality of concave parts, and the light-gathering component is thicker due to the structural design.

Disclosure of Invention

The invention aims to provide a lens, and aims to solve the technical problem that the thickness of the conventional Fresnel lens is thick.

The present invention is achieved as such, a lens comprising: the light source comprises an incident surface and an emergent surface which are arranged oppositely, wherein the incident surface comprises a plurality of first lens areas which are concentrically arranged around the axis of the lens, the emergent surface comprises a plurality of second lens areas which are concentrically arranged around the axis of the lens, light enters the lens from the incident surface, part of light is directly emitted from the emergent surface, and the other part of light is emitted from the second lens areas after being totally reflected by the first lens areas.

Further, the first lens area is a convex tooth-shaped structure arranged in an annular shape, and the second lens area is a concave tooth-shaped structure arranged in an annular shape.

Further, the convex tooth-shaped structure comprises a first surface close to the center of the incident surface and a second surface far away from the center of the incident surface, the first surface is a transmission surface, and the second surface is a total reflection surface.

Further, the concave tooth-like structure includes a third surface far from the center of the exit surface and a fourth surface near the center of the exit surface, and the third surface is a transmission surface.

Furthermore, the number of the convex tooth-shaped structures is the same as that of the concave tooth-shaped structures, and the positions of the convex tooth-shaped structures correspond to those of the concave tooth-shaped structures one by one.

Further, the light rays sequentially pass through the refraction of the first surface of the convex dentate structure, the reflection of the second surface and the refraction of the third surface of the concave dentate structure corresponding to the convex dentate structure, and then exit the lens.

Further, at least one of the first surface, the second surface and the third surface is an arc surface or an inclined surface.

Furthermore, the incident surface further comprises a groove which is arranged in the center of the incident surface and is concave inwards, and the emergent surface further comprises a bulge which is arranged in the center of the emergent surface and is convex outwards.

Further, the lens further includes a connection surface connecting the incident surface and the exit surface.

The invention also provides a light-emitting component which comprises a light source and the lens which is arranged on the light path of the light source and is described above.

The lens has the following beneficial effects: the light condensing lens comprises an incident surface and an emergent surface which are arranged oppositely, wherein the incident surface comprises a plurality of first lens areas which are concentrically arranged around the axis of the lens, the emergent surface comprises a plurality of second lens areas which are concentrically arranged around the axis of the lens, and partial light rays incident to the lens are emitted after being totally reflected, so that the focal length and the caliber required for obtaining the light rays with the same effect are smaller, the thickness and the caliber of the lens can be reduced, namely the size of the lens is reduced, and the weight of the lens is reduced, so that the size and the weight of a light condensing assembly using the lens can be reduced, and the light condensing lens can adapt to more application scenes.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of an angle configuration of a lens provided by an embodiment of the present invention;

FIG. 2 is a schematic view of another angle configuration of a lens according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a lens provided by an embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of area A of FIG. 3;

FIG. 5 is a partial enlarged view of area B of FIG. 3;

fig. 6 is a light path diagram of light irradiated on a lens provided in an embodiment of the present invention.

Reference numerals referred to in the above figures are detailed below: 1. an incident surface; 11. a first lens region; 111. a first surface; 112. a second surface; 12. a groove; 2. an exit surface; 21. a second lens region; 211. a third surface; 212. a fourth surface; 22. a protrusion; 3. a connecting surface; 10. a first angle; 20. a second angle; 30. a third angle; 100. light rays; 200. a light source.

Detailed Description

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

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

In order to explain the technical solution of the present invention, the following detailed description is made with reference to the specific drawings and examples.

Referring to fig. 1 to fig. 3, a lens according to an embodiment of the invention includes: the light source comprises an incident surface 1 and an emergent surface 2 which are arranged oppositely, and a connecting surface 3 which connects the incident surface 1 and the emergent surface 2, wherein the incident surface 1 comprises a plurality of first lens areas 11 which are concentrically arranged around the axis of the lens, the emergent surface 2 comprises a plurality of second lens areas 21 which are concentrically arranged around the axis of the lens, light 100 enters the lens from the incident surface 1, a part of the light 100 directly exits from the emergent surface 2, and the other part of the light 100 exits from the second lens areas 21 after being totally reflected by the first lens areas 11 (as shown in fig. 6). It should be noted that the lens selected by the embodiment of the present invention may include, but is not limited to, a fresnel lens.

The part of light rays 100 which enter the lens are emitted after being totally reflected, so that the focal length and the caliber required for obtaining the emergent light rays with the same effect are smaller, the thickness and the caliber of the lens can be reduced, namely the size of the lens is reduced, and the weight of the lens is reduced, so that the size and the weight of a light condensing assembly using the lens can be reduced, and the lens can adapt to more application scenes.

Referring to fig. 3, the first lens region 11 is a convex tooth-shaped structure disposed annularly, and includes a first surface 111 close to the center of the incident surface 1 and a second surface 112 far from the center of the incident surface 1, where the first surface 111 is a transmission surface and the second surface 112 is a total reflection surface. The second lens region 21 is a concave tooth-like structure arranged annularly, and includes a third surface 211 far from the center of the exit surface 2 and a fourth surface 212 near the center of the exit surface 2, wherein the third surface 211 is a transmission surface. Specifically, the number of the convex tooth-shaped structures is the same as that of the concave tooth-shaped structures, and the positions of the convex tooth-shaped structures correspond to the positions of the concave tooth-shaped structures one by one.

Referring to fig. 3 to 6, a plane perpendicular to the axis of the lens is defined as a target plane, an included angle formed between the first surface 111 and the target plane is defined as a first angle 10, an included angle formed between the second surface 112 and the target plane is defined as a second angle 20 (see fig. 4), and an included angle formed between the third surface 211 and the target plane is defined as a third angle 30 (see fig. 5). It can be understood that, by precisely adjusting the values of the first angle 10, the second angle 20 and the third angle 30 in the convex tooth-like structure and the concave tooth-like structure corresponding to each pair of positions according to the calculation, the light ray 100 emitted by the light source 200, which is disposed on the side of the incident surface 1 of the lens and is located on the axis of the lens, can be refracted through the first surface 111 of the convex tooth-like structure first, then be totally reflected through the second surface 112 of the convex tooth-like structure, and finally be refracted through the third surface 211 of the concave tooth-like structure corresponding to the convex tooth-like structure, and then exit the lens from the exit surface 2 after entering from the incident surface 1 of the lens. Compared with the existing single-sided Fresnel lens, the light rays passing through the lens of the embodiment can be refracted once, refracted through total reflection and refracted again and then emitted, because the light path of the light rays 100 is deflected towards the center direction of the emergent surface 2 in the process of total reflection, the light rays originally needing to be emitted from the outer side of the emergent surface can be emitted from the position closer to the center of the emergent surface 2 through the total reflection, so that the caliber of the emergent surface can be made smaller, further the focal length and the caliber required for obtaining the light rays with the same effect are smaller, the thickness and the caliber of the lens can be reduced, namely the size of the lens is reduced, the weight of the lens is reduced, the size and the weight of a light-gathering component using the lens can be reduced, meanwhile, the thickness of the lens is reduced, the distance of the light rays linearly propagating in the lens is shortened, and the loss of light ray energy is reduced, therefore, the quality of emergent rays is better, and the lens of the embodiment can adapt to more application scenes.

Specifically, in the lens, the first angle 10 formed by the first surface 111 of each convex tooth-shaped structure and the target surface may be set to be the same or different, the second angle 20 formed by the second surface 112 of each convex tooth-shaped structure and the target surface may be the same or different, the third angle 30 formed by the third surface 211 of each concave tooth-shaped structure and the target surface may be the same or different, and may be adjusted according to specific needs, so as to ensure that the light is incident from the corresponding convex tooth-shaped structure, and during the process of emitting the concave tooth-shaped structure, the light may sequentially pass through the refraction of the first surface 111, the total reflection of the second surface 112, and the refraction of the third surface 211. Further, the reason for the uneven brightness of the illumination beam in the fresnel lens is due to the upright surfaces of the fresnel lens zones. In the fresnel lens having a shape cut out from the convex lens, a step is formed between fresnel lens regions, inevitably having an upright surface. The upright surface causes light to be reflected or refracted to the outside of the illumination area, and partially blocks the illumination light beam in which dark lines occur, which are darker than other light, so that the area illuminated by the dark lines is darker than the surrounding area, resulting in unevenness in brightness, and thus, the first angle 10, the second angle 20, and the third angle 30 are not designed to be 90 ° at the time of design.

Referring to fig. 3, the first surface 111 may be an inclined surface or an arc surface; the second surface 112 may be an inclined surface or an arc surface; the third surface 211 may be a slope or an arc. The first surface 111, the second surface 112 and the third surface 211 are designed to be arc-shaped, so that light can be better refracted or reflected, and light emitted by the lens is more uniform. In this embodiment, taking the third plane 211 as an example, the third plane 211 has a lower value of the third angle 30 at the bottom corner near the incident plane 1 and a higher value of the third angle 30 at the top corner far from the incident plane 1, that is, the third angle 30 formed by the third plane 211 and the target plane is gradually increased along the direction far from the incident plane 1, so that the third plane 211 has a curve to form an arc surface.

Referring to fig. 1 and fig. 2, the incident surface 1 further includes a groove 12 disposed in the center of the incident surface 1, that is, the incident surface 1 is composed of a central and inwardly recessed groove 12 and a plurality of first lens regions 11 concentrically disposed around the groove 12. The exit surface 2 further comprises a protrusion 22 arranged in the center of the exit surface 2 and protruding outwards, i.e. the exit surface 2 is composed of a protrusion 22 in the center and a plurality of second lens regions 21 arranged concentrically around the protrusion 22.

The lens of this embodiment may be made of a suitable polymer sheet material, such as Polymethylmethacrylate (PMMA), Cyclic Olefin Polymer (COP), or other acrylic polymers.

The present embodiment also provides a light emitting assembly including a light source 200 and a lens disposed on an optical path of the light source 200. Alternatively, the light source 200 is a point light source disposed on the incident surface 1 side of the lens and located on the axis of the lens.

The invention is not to be considered as limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.

Claims

1. A lens, comprising: the light source comprises an incident surface and an emergent surface which are arranged oppositely, wherein the incident surface comprises a plurality of first lens areas which are concentrically arranged around the axis of the lens, the emergent surface comprises a plurality of second lens areas which are concentrically arranged around the axis of the lens, light enters the lens from the incident surface, part of light is directly emitted from the emergent surface, and the other part of light is emitted from the second lens areas after being totally reflected by the first lens areas.

2. The lens of claim 1, wherein the first lens region is an annularly disposed convex-shaped tooth-like structure and the second lens region is an annularly disposed concave-shaped tooth-like structure.

3. The lens of claim 2, wherein the convex tooth-like structure includes a first surface close to a center of the incident surface and a second surface far from the center of the incident surface, the first surface being a transmission surface, the second surface being a total reflection surface.

4. The lens of claim 3 wherein the concave tooth-like structure comprises a third surface distal from the center of the exit surface and a fourth surface proximal to the center of the exit surface, the third surface being a transmissive surface.

5. The lens of claim 4, wherein the number of the convex-shaped tooth structures is the same as the number of the concave-shaped tooth structures, and the positions correspond to one another.

6. The lens of claim 5, wherein the light exits the lens through refraction by the first surface of the convex-shaped tooth-like structure, reflection by the second surface, and refraction by the third surface of the concave-shaped tooth-like structure corresponding to the position of the convex-shaped tooth-like structure in this order.

7. The lens of any of claims 4 to 6, wherein at least one of the first, second and third surfaces is a curved surface or a beveled surface.

8. The lens of any of claims 1 to 6, wherein the entrance face further comprises a recess disposed in the center of the entrance face and recessed inward, and the exit face further comprises a protrusion disposed in the center of the exit face and protruding outward.

9. The lens of any of claims 1 to 6, further comprising a connecting surface connecting the entrance surface and the exit surface.

10. A light emitting assembly comprising a light source and the lens of any one of claims 1 to 9 disposed in an optical path of the light source.