CN211232458U

CN211232458U - Lens and light-emitting device

Info

Publication number: CN211232458U
Application number: CN201922320426.6U
Authority: CN
Inventors: 刘贤金; 郑永生; 侯宇; 曾照明; 肖国伟
Original assignee: APT Electronics Co Ltd
Current assignee: APT Electronics Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-08-11
Anticipated expiration: 2029-12-20

Abstract

The utility model provides a lens and luminescent device relates to the optical device field. The lens comprises a lens body, a lens cover and a lens, wherein the lens body is provided with an emergent surface and an incident surface used for receiving light rays of a light source, and the emergent surface and the incident surface are oppositely arranged; the incident surface comprises a first incident surface and a second incident surface which is concave towards the emergent surface, the first incident surface is connected with the second incident surface, the first incident surface is a prismatic surface, and the second incident surface is a curved surface with a plurality of salient points on the surface; the emergent surface comprises a first emergent surface and a second emergent surface which is concave towards the incident surface, the first emergent surface is connected with the second emergent surface, and the second emergent surface is a curved surface with a plurality of particles on the surface. The utility model discloses a lens is applied to luminescent device, can reach the effect that the wide-angle is luminous, the high degree of consistency.

Description

Lens and light-emitting device

Technical Field

The utility model relates to an optical device field especially relates to a lens and luminescent device.

Background

Along with the improvement of illumination quality, people have higher and higher requirements on the light emitting uniformity of the lamp. In order to achieve the purpose of uniform light emission, a mode of increasing the number of the light emitters is generally adopted, but the mode has higher cost and brings certain economic burden to enterprises and consumers. In order to control the cost and reduce the use of the luminous body, a lens can be used for secondary light distribution so as to enlarge the luminous angle and improve the utilization rate of light energy. However, the existing lens is limited by factors such as its shape, and the light energy distribution and utilization effects are still not ideal enough, and the effects of large-angle light emission and high uniformity cannot be achieved.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a lens capable of achieving the effects of large-angle light emission and high uniformity aiming at the problem that the existing lens cannot achieve large-angle light emission and high uniformity.

A lens comprises a lens body, wherein the lens body is provided with an emergent surface and an incident surface used for receiving light rays of a light source, and the emergent surface and the incident surface are oppositely arranged;

the incident surface comprises a first incident surface and a second incident surface which is concave towards the emergent surface, the first incident surface is connected with the second incident surface, the first incident surface is a prismatic surface, and the second incident surface is a curved surface with a plurality of salient points on the surface;

the emergent surface comprises a first emergent surface and a second emergent surface which is concave towards the incident surface, the first emergent surface is connected with the second emergent surface, and the second emergent surface is a curved surface with a plurality of particles on the surface.

As known to those skilled in the art, the luminous beam angle of the LED is 110-. Therefore, the utility model discloses a lens adopt multiple incident surface and emitting surface, at first, the utility model discloses a first incident surface is the rhombus face, can be greater than 120 partial light with LED and refract and launch the back, some propagates to first emergent surface to it carries out the compensation of luminance to the annular facula area apart from central light intensity than far away to shine through first emergent surface transmission, secondly, throw to first emergent surface after reflection light each other carries out secondary or a lot of refraction between the prismatic face of first incident surface, as before realize luminance and more big light angle's secondary or many times compensation, the visible light that can utilize LED to send of using prismatic structure's first incident surface more effectively, change the propagation path of light through first incident surface simultaneously, reach the high degree of consistency and more big light angle's requirement at the face of shining. In addition, the other part of the light beam with the beam angle larger than 120 degrees and the light beam with the beam angle smaller than 120 degrees are transmitted to the second incidence surface, the second incidence surface is provided with salient points, the light beam can be transmitted to the surface spherical surface of each salient point for refraction and divergence treatment, and the light-emitting angle of the original light beam smaller than 120 degrees emitted by the LED is expanded for the first time. The utility model discloses bump on the incident surface is the graininess, can effectual control light carry out orderly reflection or refraction and propagate, make light be decomposed behind the emergent surface and form the multi-beam light of different angles, reach the more even purpose of wider light distribution.

In one embodiment, the first incident surface is a multi-stage prismatic surface. The order and the angle of the prismatic surface can meet the requirement that more light rays of which the angle is more than 120 degrees of the LED are refracted for two or more times and then projected to the first emergent surface. The reflected light rays between the multistage prismatic surfaces are refracted for two times or more and then projected to the first emergent surface, so that the LED light rays can be more efficiently utilized, and the secondary or multiple compensation of the brightness and the larger light-emitting angle can be realized.

Preferably, the utility model provides a first incident surface of preferred, this first incident surface are level four prismatic face, along first incident surface to the direction of second incident surface, level four prismatic face with the contained angle of lens body bottom surface is 44 ~ 46 respectively, 78 ~ 84, 74 ~ 78, 85 ~ 90.

More preferably, along the direction from the first incident surface to the second incident surface, the included angles between the four-step prism surface and the bottom surface of the lens body are respectively 45 degrees 21 ', 81 degrees 33', 76.3 degrees 41 'and 88 degrees 36'.

In one embodiment, the second incident surface is a parabolic arc surface, and the numerical formula of the parabolic arc surface is y ═ ax²Wherein a is-0.5 to-0.2. The above numerical formula is obtained with the conventional direction of placing of lens, and the conventional direction of placing is when the LED luminous element is located the bottom, and this parabola cambered surface opening is down, and of course, this product also can be placed towards each direction as required, and the shape and the structure of second incident surface can not change because of placing the direction.

In one embodiment, a is-0.35.

In one embodiment, each bump has a height of 0.31-0.33 mm, a maximum radial distance of 0.5-0.7 mm, and a distribution density of 230-250/cm². More preferably, the maximum radial distance of the salient points is 0.62 mm. The salient points are arranged on the second incident surface, so that the light beams with very concentrated light rays can be effectively dispersed for the first time. In order to further achieve the effects of enlarging the light-emitting angle and improving the uniformity, the size, height and distribution density of the bumps need to be controlled. The maximum radial distance refers to the maximum width of a single lobe.

In one embodiment, the second exit surface is a parabolic arc surface, and the numerical formula of the parabolic arc surface is represented by y ═ bx²Wherein b is 0.01 to 0.03. The numerical formula is obtained by the conventional lens placing direction, namely when the LED luminous body is positioned at the bottom, the opening of the parabolic cambered surface faces upwards, and of course, the product can also be used as requiredThe shape and structure of the second exit surface are not changed by the placing direction when the second exit surface is placed in various directions.

In one embodiment, b is 0.025.

In one embodiment, each of the particles has a height of 0.35 to 0.52mm, a maximum radial distance of 0.7 to 0.9mm, and a distribution density of 133 to 146 particles/cm². Set up the granule on the second exit face, can carry out a plurality of directions with the pencil of rays that send on the second incident face and diverge, the granule that will be denser light through setting up on the second exit face is diverged and is handled for the light luminous angle through the second exit face is bigger, and the degree of consistency is higher. Furthermore, the luminous angle can be better enlarged and the uniformity can be improved by controlling the density and the height of the particles. If the density is too low or too high, the spots reflected to the illuminated surface will alternate light and dark. In addition to controlling the density of the particles, the height of the particles can be controlled, and if the height of the particles is too high, the angle of the light emitted from the second exit surface cannot be effectively controlled. The light-emitting angle is preferably controlled at 160 DEG and 170 DEG by controlling the density and height of the particles.

Preferably, the maximum radial distance of the particles is 0.86 mm.

In one embodiment, the lens further comprises a base, and the lens body is arranged on the base.

In one embodiment, the base is provided with a diffuse reflection boss around the lens body.

In one embodiment, a plurality of boss salient points are arranged on the surface of the diffuse reflection boss, and the volume of each boss salient point is 0.31-0.33 mm³The maximum radial distance is 0.58-0.62 mm, and the distribution density is 230-250 pieces/cm². The diffuse reflection boss is provided with the boss salient points, so that the high-density light ray beams of the second emergent surface can be diffused and then reflected to the illuminated surface, and luminance compensation is performed on the illuminated surface area with low luminance except the central area. Furthermore, in order to achieve better effects of enlarging the light-emitting angle and improving the uniformity, the volume and the distribution density of the boss salient points need to be controlled.

In one embodiment, the exposed surface of the base is a diffuse reflection curved surface; the diffuse reflection curved surface is provided with a plurality of curved surface salient points, the height of each curved surface salient point is 0.55-0.72 mm, the maximum radial distance is 1.55-1.63mm, and the distribution density is 32-38 pieces/cm². The diffuse reflection curved surface is provided with the curved surface salient points, so that all the light ray bundles subjected to secondary or multiple reflection and refraction in the system can be scattered and then reflected back to the illuminated surface again, and the luminance compensation is performed on the illuminated surface area with low luminance except the central area. Further, in order to achieve better effects of enlarging the light-emitting angle and improving the uniformity, the height, size and distribution density of the curved-surface boss salient points need to be controlled.

In one embodiment, the lens body and the base are made of synthetic resin with a refractive index of 1.3-1.6. The synthetic resin may be selected from PMMA, PC, etc.

An aspect of the present invention is to provide a light emitting device, including a LED light emitting body and the above lens, the LED light emitting body is disposed in a groove formed in an incident surface of the lens.

Above-mentioned luminescent device, through the utility model discloses a light that lens sent the LED luminous element carries out the grading, makes luminous angle reach more than 160 ~ 170, has the high degree of consistency moreover, can significantly reduce the quantity of LED luminous element, practices thrift the cost, improves lighting quality, improves the comfort level of vision.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses a lens has adopted multiple incident surface and emergent surface, and first incident surface is the diamond face, has the bump on the second incident surface, is equipped with the granule on the second emergent surface, can reflect or refract light, makes light be decomposed behind the emergent surface and forms the multi-beam light of different angles, reaches the purpose with the wider more even of light distribution.

The utility model discloses a light emitting device adopts the utility model discloses a light that lens sent the LED luminous element carries out the grading, makes luminous angle reach 160 and supplyes more than 170, has the high degree of consistency moreover, and the quantity of the LED luminous element that can significantly reduce practices thrift the cost, improves lighting quality, improves the comfort level of vision.

Drawings

FIG. 1 is a structural view of a light emitting device to which a lens according to embodiment 1 is attached;

FIG. 2 is a schematic view of the incident surface of the lens described in example 1;

fig. 3 is a top view of the lens of the present invention;

fig. 4 is a top view of a light emitting device described in embodiment 2;

FIG. 5 is a schematic view of the light direction of the light emitting device according to embodiment 2;

fig. 6 is a graph showing the light uniformity test of the light emitting device according to example 2.

In the figure, 1, a lens body; 2. an LED light emitter; 3. a PCB; 4. an object to be irradiated; 100. an incident surface; 101. a first incident surface; 102. a second incident surface; 1021. salient points; 200. an exit surface; 201. a first exit surface; 202. a second exit surface; 2021. particles; 300. a base; 301. a diffuse reflective curved surface; 400. diffuse reflection boss.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention 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.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present.

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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

A lens, as shown in fig. 1-3, comprises a lens body 1 and a base 300, wherein the lens body 1 is fixed on the base 300, the base 300 is circular, and the center of the lens body 1 coincides with the center of the base 300;

the lens body 1 and the base 300 are made of synthetic resin having a refractive index of 1.3 to 1.6, such as PMMA or PC. The upper surface of the lens body 1 is an exit surface 200, the lower surface is an incident surface 100, and light emitted by the light source enters the lens body 1 through the incident surface 100 and then exits from the exit surface 200.

The incident surface 100 is formed by connecting a first incident surface 101 and a second incident surface 102; the first incident surface 101 is a four-step prism surface, which is formed by connecting four inclined surfaces with different inclination angles, and the included angles between the four-step prism surface and the bottom surface of the lens body 1 are respectively 45 degrees 21 ', 81 degrees 33', 76.3 degrees 41 'and 88 degrees 36' from bottom to top. The second incident surface 102 is a parabolic arc surface, the edge of the arc surface is connected with the upper edge of the four-level prismatic surface, and the numerical formula of the parabolic arc surface is represented as y ═ ax²Wherein a is-0.35.

In order to increase diffuse reflection, a plurality of salient points 1021 are arranged on the surface of the second incident surface 102, the height of each salient point 1021 is 0.31-0.33 mm, the maximum radial distance is 0.62mm, and the distribution density is 230-250/cm²(ii) a The bump may be formed by: the first incident surface 101 of the lens body 1 obtained by injection molding is convex by using a mold having a surface with extremely fine particle depressions.

The exit surface 200 is formed by connecting a first exit surface 201 and a second exit surface 202; the first emergent surface 201 is a smooth curved surface, and the smooth curved surface can be an arc surface or a curved surface; in order to decompose the emergent light when passing through the emergent face 200, a plurality of particles 2021 are arranged on the second emergent face 202, the height of each particle 2021 is 0.35-0.52 mm, the maximum radial distance is 0.86mm, and the distribution density is 133-146 particles/cm²(ii) a The formation of the particles is similar in principle to the formation of the bumps.

The second incident surface 102 is recessed towards the emergent surface 200, and the second emergent surface 202 is recessed towards the incident surface 100, so that the middle of the lens body 1 is narrow, the two sides of the lens body are wide, further divergence of the light beam output by the second incident surface 102 is facilitated, the central light intensity is reduced, and the compensation effect is performed on the region with low luminance except the central region, so that the larger light distribution angle and the uniformity are achieved.

The base 300 is further provided with a diffuse reflection boss 400, the diffuse reflection boss 400 surrounds the lens body 1 to form a ring, a plurality of boss salient points are arranged on the surface of the diffuse reflection boss 400, and the volume of each boss salient point is 0.31-0.33 mm³The distribution density is 230 to 250 pieces/cm²The distance between the diffuse reflection boss 400 and the lens body 1 is 1.7-3.3 mm; the light reflected from the second exit surface 202 may pass through the convex points on the diffuse reflection convex stage 400 and be refracted or reflected again onto the illuminated surface; the bump bumps are formed similarly to the bumps on the second incident surface 102.

The surface of the base 300 exposed between the diffuse reflection boss 400 and the lens body 1 is a diffuse reflection curved surface 301, the diffuse reflection curved surface 301 is annular, a plurality of curved surface salient points are also arranged on the diffuse reflection curved surface 301, the height of each single curved surface salient point is 0.55-0.72 mm, the maximum radial distance is 1.55-1.63mm, and the distribution density is 32-38 pieces/cm²(ii) a The curved surface convex points are formed similarly to the convex points on the second incident surface 102 described above.

Example 2

A light emitting device is disclosed, as shown in FIG. 4, 4 lenses of embodiment 1 are fixed on a circular PCB3 board, one of the lenses is located at the center of the circle, the other 3 lenses are evenly distributed at the edge, and a LED light emitting body 2 is arranged in a groove formed by each lens incidence plane 100.

In this embodiment, a plurality of LEDs and lens combinations are cascaded, so that the A, B, C area in fig. 4 has significantly increased brightness and the overall uniformity is significantly improved.

The working principle of this embodiment is as follows, and the light direction can be seen in fig. 5: the LED luminary 2 emits light beams, which are L1, L2, and L3 in fig. 5, wherein:

the light beam L1 passes through the first emergent surface 201 on the lens body, is decomposed into light beams L1-1 and L1-2, and then is projected on the illuminated object 4 to become a part of a high-uniformity light spot;

the ray bundle L2 passes through the second emergent surface 202 on the lens body, is transmitted and refracted, and decomposes the ray bundle L2 into ray bundles L2-1 and L2-2 through the dense particles 2021 on the second emergent surface 202, and then projects the ray bundles onto the irradiated body 4;

the light beam L3 is reflected by the second emergent surface 202 on the lens body and changed into a light beam L3-1 through the first emergent surface 201, the light beam L3-1 is projected on the diffuse reflection boss 400 and is diffused by the salient points on the diffuse reflection boss 400, and then the light beam L3-1 is decomposed into light beams L3-1-1 and L3-1-2 and is projected on the illuminated body 4;

the light beams L1-1, L1-2, L2-1, L2-2, L3-1-1 and L3-1-2 are projected to the illuminated body 4, a plurality of salient points are arranged on the illuminated surface of the illuminated body 4, light projected to the illuminated surface can be diffused and reflected for the second time, the reflected light beam L4 is projected to the diffuse reflection curved surface 301 of the base 300, the salient points of the bosses on the diffuse reflection curved surface 301 reflect the light beam L4 and project the light beam to the illuminated surface again, and the effect of further improving the uniformity of light spots of the illuminated surface is achieved. The size and density of the salient points on the illuminated surface of the illuminated body 4 are the same as those on the second incident surface 102.

The luminous degree of consistency of this luminescent device is higher through testing, and the test chart is shown as figure 6, adopts the utility model discloses the key index of ceiling lamp brilliance degree of consistency of lens scheme is as follows:

uniformity is min/mean;

the method is based on a national standard GB50034-2010 uniformity calculation method. As shown in the figure, the luminance minimum value is 3417.145, the average luminance value is 3658.324, and the calculated uniformity is 0.9341. Adopt the utility model discloses lens are not only limited to realize the degree of consistency and are 0.9341.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A lens is characterized by comprising a lens body, wherein the lens body is provided with an emergent surface and an incident surface for receiving light rays of a light source, and the emergent surface and the incident surface are oppositely arranged;

2. The lens of claim 1, wherein the first incident surface is a quadric prism surface, and the included angles between the quadric prism surface and the bottom surface of the lens body are 44-46 °, 78-84 °, 74-78 °, 85-90 °, respectively.

3. The lens of claim 1, wherein the second incident surface is a parabolic curved surface, and the numerical formula of the parabolic curved surface is y-ax²Wherein a is-0.5 to-0.2.

4. The lens of any one of claims 1 to 3, wherein each of the bumps has a height of 0.31 to 0.33mm, a maximum radial distance of 0.5 to 0.7mm, and a distribution density of 230 to 250 pieces/cm²。

5. The lens of claim 1, whereinCharacterized in that the second emergent surface is a parabolic cambered surface, and the numerical formula of the parabolic cambered surface is represented by y-bx²Wherein b is 0.01 to 0.03.

6. The lens according to claim 1 or 5, wherein each of the particles has a height of 0.35 to 0.52mm, a maximum radial distance of 0.7 to 0.9mm, and a distribution density of 133 to 146 particles/cm²。

7. The lens of claim 1, further comprising a base, the lens body being disposed on the base; a diffuse reflection boss is arranged on the base and surrounds the lens body.

8. The lens of claim 7, wherein the surface of the diffuse reflection convex stage is provided with a plurality of convex stage convex points, the convex stage convex points have a height of 0.31-0.33 mm, a maximum radial distance of 0.58-0.62 mm, and a distribution density of 230-250/cm²(ii) a The exposed surface of the base is a diffuse reflection curved surface, a plurality of curved surface salient points are arranged on the diffuse reflection curved surface, the height of each curved surface salient point is 0.55-0.72 mm, the maximum radial distance is 1.55-1.63mm, and the distribution density is 32-38 pieces/cm²。

9. The lens of claim 7 or 8, wherein the lens body and the base are made of synthetic resin having a refractive index of 1.3 to 1.6.

10. A light emitting device comprising an LED light emitter and the lens of any one of claims 1 to 9, wherein the LED light emitter is disposed in a groove formed on an incident surface of the lens.