Lens for improving light emission uniformity of a panel light

Abstract

The application provides a lens for improving the light-emitting uniformity of a panel lamp, which is suitable for being placed on a light source part. The lens comprises a main body, an incident cavity, a first refracting surface and a second refracting surface. The first refracting surface is located on the top surface of the main body. The incident cavity is recessed from the bottom surface of the main body to the top surface. The second refracting surface is annularly arranged on the bottom surface of the main body and surrounds the opening part of the incident cavity. The light source part is located below the opening part. The second refracting surface forms an included angle with the light-emitting surface of the light source part. The lens with the first refracting surface and the second refracting surface can improve the light efficiency and avoid the reduction of uniformity when solving the problem of stacked light source parts through specific geometric parameter configuration and hyperbolic curve segment design.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lens, especially point to a kind of lens that improve the luminous uniformity of panel light. BACKGROUND

[0002] As the lamp of indoor illumination, LED panel light has the characteristics of large emitting surface and soft light. With the development of LED technology, more and more attention is paid to energy saving and emission reduction, so panel light also faces the demand of improving light efficiency. The commonly used panel light on the market can be divided into side-in type and direct type according to optical scheme. The direct type panel light usually adopts lens to perform secondary light distribution on light source, and then the uniform light emitting effect can be presented. However, with the demand of higher light efficiency, many light sources need to be arranged inside the panel light, which leads to the decrease of light emitting uniformity. Moreover, since the lens needs to be fixed on the substrate by glue, when the light source generates heat, the temperature rise will cause the lens to separate from the glue, resulting in the phenomenon of falling off. The current panel light lens application is relatively single, and when the light source needs to be stacked to increase the light efficiency, the uniformity will be greatly reduced. SUMMARY

[0003] In view of the above problems, a lens for improving the luminous uniformity of panel light is proposed.

[0004] An embodiment of the utility model provides a kind of lens that improve the luminous uniformity of panel light, it is suitable to place on light source piece, it is characterized by: the lens includes main body, the main body has top surface and bottom surface, the main body includes first refractive surface, the first refractive surface is located in the top surface of the main body, from the bottom surface of the main body to the top surface, inwardly concave setting has incident cavity, the incident cavity has opening part, the main body also includes second refractive surface, the second refractive surface annularly sets in the bottom surface of the main body and surrounds the opening part of the incident cavity around, the light source piece is located below the opening part, the main body is configured to receive light from the light source piece via the incident cavity, and the light with the first angle of incidence is emitted via the first refractive surface, the light with the second angle of incidence is totally reflected via the second refractive surface and then emitted from the first refractive surface, the first angle is less than the second angle, the incident cavity has inner contour line including first curve segment and second curve segment, the intersection of the first curve segment and second curve segment forms intersection point, from the intersection point to the intersection point of the median line of the light source piece and the light emitting surface of light source piece, then the connecting line is formed with the light emitting surface of the light source piece 35 degrees included angle, and 55 degrees included angle is formed with the median line of the light source piece, the included angle formed by the second refractive surface and the light emitting surface of the light source piece is 0 degrees to 20 degrees.

[0005] According to the above preferred embodiment, the light source member comprises a package body, a phosphor layer and a chip in the package body, and the chip is located at the center of the package body.

[0006] According to the above preferred embodiment, the opening part of the incident cavity has a center point corresponding to the light emitting point of the light emitting surface of the light source member, the outer side to the inner side of the second refractive surface is a slope, the inner side of the second refractive surface protrudes outwardly from the bottom surface of the main body and connects the opening part, the slope angle of the second refractive surface matches the light intensity distribution of the light source member, and effective total reflection of light is realized.

[0007] According to the above preferred embodiment, when the included angle between the second refractive surface and the light emitting surface of the light source member is 12.5 degrees, the light uniformity is greater than or equal to 0.85.

[0008] According to the above preferred embodiment, the profile line of the first refractive surface is a spline curve, and when the included angle between the line connecting any point on the profile line of the first refractive surface and the center point of the opening part and the light emitting surface of the light source member is between 0 degrees and 35 degrees, the curvature of the curve gradually decreases.

[0009] According to the above preferred embodiment, when the included angle between the first refractive surface and the perpendicular line of the light emitting surface of the light source member is greater than 35 degrees, the curvature of the curve gradually increases, and the increasing rate of the curvature of the curve matches the light intensity distribution curve of the light source member.

[0010] According to the above preferred embodiment, the top surface of the main body has a recess corresponding to the upper side of the light source member.

[0011] According to the above preferred embodiment, the lens comprises a plurality of microstructures arranged in a ring shape on the second refractive surface.

[0012] In summary, according to the lens with the first refractive surface and the second refractive surface according to an embodiment of the present application, the light efficiency can be improved and the uniformity can be avoided when solving the problem of stacking the light source member. In addition, the light uniformity is improved through the synergistic effect of the first curve segment, the second curve segment and the refractive surface, and the light output uniformity of the surface lamp is significantly improved. In addition, the second angle light of the light source member is effectively utilized after twice total reflection, and the overall light efficiency is improved. Furthermore, the slope design of the second refractive surface reduces the weight of the lens by about 15%, increases the heat dissipation space of the light source member, and reduces the risk of thermal debonding. A plurality of lenses can meet a plurality of light source arrangement applications, and the light mixing effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a front appearance schematic view of an embodiment of the lens of the present application.

[0014] Figure 2 is a back appearance schematic diagram of an embodiment of the lens of the utility model.

[0015] Figure 3 is a bottom view schematic diagram of an embodiment of the lens of the utility model.

[0016] Figure 4 is a sectional view schematic diagram of an embodiment of the lens of the utility model.

[0017] Figure 5 is a schematic diagram of an embodiment of the light source piece of the utility model having second angle light emission.

[0018] Figure 6 is a schematic diagram of an embodiment of the light source piece of the utility model having first angle light emission.

[0019] Figure 7 is a light efficiency schematic diagram of an embodiment of the lens of the utility model with the second refraction surface and the light emission surface being 0 degrees.

[0020] Figure 8 is a light efficiency schematic diagram of an embodiment of the lens of the utility model with the second refraction surface and the light emission surface being 10 degrees.

[0021] Figure 9 is a light efficiency schematic diagram of an embodiment of the lens of the utility model with the second refraction surface and the light emission surface being 15 degrees.

[0022] Figure 10 is a light efficiency schematic diagram of an embodiment of the lens of the utility model with the second refraction surface and the light emission surface being 12.5 degrees.

[0023] Figure 11 is a light efficiency schematic diagram of an embodiment of the lens of the utility model with the second refraction surface and the light emission surface being 18 degrees.

[0024] Figure 12 is a light efficiency schematic diagram of an embodiment of the lens of the utility model applied to 4 light source plates.

[0025] Figure 13 is a light efficiency schematic diagram of an embodiment of the lens of the utility model applied to 6 light source plates.

[0026] Figure 14 is a light efficiency schematic diagram of an embodiment of the lens of the utility model applied to 7 light source plates.

[0027] Explanation of reference signs:

[0028] lens 100, light source 200, light emitting point 201, light emitting surface 202, package 203, chip 204, phosphor layer 205, panel lamp 300, main body 1, recess 11, incident cavity 2, opening 20, first curve segment 21, second curve segment 22, first refractive surface 3, second refractive surface 4, microstructure 5, median line P, first angle , second angle , light intensity distribution curve LC, intersection A of first curve segment and second curve segment, intersection B of median line and light emitting surface.

[0029] The detailed features and advantages of the present application are described in detail in the embodiments below, and the contents are sufficient to enable any person skilled in the art to understand the technical content of the present application and to implement it, and according to the contents, claims and drawings disclosed in the specification, any person skilled in the art can easily understand the purpose and advantages related to the present application. DETAILED DESCRIPTION

[0030] In order to describe the technical content, structural features, purposes and effects of the technical scheme in detail, the following will be described in detail in combination with specific embodiments and the drawings.

[0031] Please refer to Figures 1 to 4 , Figure 1 is a front view of a lens according to an embodiment of the present application, Figure 2 is a back view of a lens according to an embodiment of the present application, Figure 3 is a bottom view of a lens according to an embodiment of the present application, Figure 4 is a cross-sectional view of a lens according to an embodiment of the present application. The lens 100 is placed on the light source 200, which includes the light emitting point 201 and the light emitting surface 202 as the source of light emission. The lens 100 is a transparent circular structure, which includes the main body 1, the incident cavity 2, the first refractive surface 3 and the second refractive surface 4. The main body 1 is configured to receive light from the light source 200 through the incident cavity 2. The first refractive surface 3 is located on the top surface of the main body 1. The incident cavity 2 is recessed from the bottom surface of the main body 1 to the top surface. The center point of the incident cavity 2 corresponds to the light emitting point 201 of the light source 200. The second refractive surface 4 is annularly arranged on the bottom surface of the main body 1 and surrounds the opening 20 of the incident cavity 2.

[0032] The main body 1 is the overall structure of the lens 100. The top surface of the main body 1 forms the first refractive surface 3 which is curved outward. The first refractive surface 3 is recessed towards the light source 200 to form the recess 11. The bottom surface of the main body 1 is centrally provided with the incident cavity 2 for receiving the light emitted by the light emitting point 201 of the light source 200.

[0033] The lens 100 is made of transparent optical material, and the lens 100 comprises the microstructure 5 arranged on the second refractive surface 4. When the lens 100 is installed, the light source 200 is located directly below the opening part 20 of the incident cavity 2.

[0034] The cross section of the incident cavity 2 is composed of two curve segments, that is, the incident cavity 2 has an inner contour line comprising a first curve segment 21 and a second curve segment 22. The intersection of the first curve segment 21 and the second curve segment 22 forms an intersection point A. A line is drawn from the intersection point A to the intersection point B of the perpendicular line P of the light source 200 and the light emitting surface 202 of the light source 200. The angle between the line AB and the light emitting surface 202 of the light source 200 is 35 degrees. The curvature of the first curve segment 21 is basically unchanged, which is used to guide the light rays with a first angle (as shown in ). Figure 6 The angle between the line AB and the perpendicular line P of the light source 200 is 55 degrees. The curvature gradually increases from the end close to the light source to the end away from the light source, which is used to effectively control the entering path of the light rays with a second angle.

[0035] Please refer to Figures 1 to 4 , the first refractive surface 3 is located on the bottom surface of the main body 1, and the contour line of the first refractive surface 3 is a spline curve structure. Within the range of the angle of 35 degrees with the perpendicular line P of the light emitting surface 202 of the light source 200, the curvature gradually decreases; when the angle is greater than 35 degrees, the curvature gradually increases. This surface can further refract the light rays emitted from the incident cavity 2, realizing light diffusion.

[0036] The second refractive surface 4 is arranged in a ring shape on the bottom surface of the main body 1, surrounding the periphery of the opening part 20 of the incident cavity 2. The inner side of the second refractive surface 4 protrudes outward and forms an inclined surface, which gradually transitions from the outer side to the inner side of the second refractive surface 4 to the opening part 20. The angle R between the second refractive surface 4 and the light emitting surface 202 of the light source 200 is 0 to 20 degrees, and the best design is 12.5 degrees.

[0037] The surface of the second refractive surface 4 is provided with a plurality of microstructures 5 arranged in a ring shape, which are used to adjust the direction and diffusion effect of the light rays and improve the uniformity of light mixing.

[0038] When the lens 100 is installed on the light source 200, the light emitting point 201 of the light source 200 is aligned with the center point of the incident cavity 2, and the opening part 20 is closely aligned with the light emitting surface 202. In the light transmission process, when the light source 200 is lighted, the light with the first angle of the incident angle is directly passed through the incident cavity 2, refracted by the first refractive surface 3 and then emitted outward; the light with the second angle of the incident angle enters the incident cavity 2, is totally reflected by the second refractive surface 4, changes direction after reflection, and is then refracted by the first refractive surface 3 and emitted, and the first angle is smaller than the second angle; the interface reflection light that can be generated at the first refractive surface 3 is totally reflected by the second refractive surface 4 again and is further utilized. That is to say, the light of the light source 200 enters the main body 1 from the incident cavity 2, the light with the first angle is emitted through the first refractive surface 3, the light with the second angle is emitted from the first refractive surface 3 after being totally reflected by the second refractive surface 4, and part of the light is reflected to the second refractive surface 4 by the interface reflection of the first refractive surface 3.

[0039] Please refer to Figure 5 and Figure 6 , Figure 5 is an embodiment of the light source 200 of the utility model and has the first angle light emitting schematic view. Figure 6 is an embodiment of the light source 200 of the utility model and has the second angle light emitting schematic view. The light source 200 comprises a package body 203, a fluorescent powder layer 205 and a chip 204 in the package body 203, the chip 204 is a blue light chip, the chip 204 is located at the center of the package body 203, that is, the blue light chip 204 is located at the center of the support, and the edge of the support is the region of the fluorescent powder layer 205. The light intensity distribution curve LC on the normal line of the light source 200 is the highest, and the light intensity gradually decreases with the increase of the angle between the light of the light source 200 and the normal line. In the embodiment, the thickness formed by the incident cavity 2 and the first refractive surface 3 of the lens 100 gradually increases with the decrease of the light intensity of the light source 200.

[0040] Please refer to Figure 7 , Figure 7 is the light efficiency schematic view of the embodiment of the utility model and the second refractive surface 4 of the lens 100 and the angle R of the light emitting surface 202 is 0 degrees, which is compared by color and gray, and the uniformity simulation effect is seen, and when the second refractive surface 4 has the slope of 0 degrees, the uniformity is 0.78.

[0041] Please refer to Figure 8 , Figure 8 is the light efficiency schematic view of the embodiment of the utility model and the second refractive surface 4 of the lens 100 and the angle R of the light emitting surface 202 is 10 degrees, which is compared by color and gray, and the uniformity simulation effect is seen, and when the second refractive surface 4 has the slope of 10 degrees, the uniformity is 0.75.

[0042] Please refer to Figure 9 , Figure 9 is the light efficiency schematic diagram of the embodiment of the lens 100 of the utility model, it is the contrast that has color and gray respectively, see the uniformity simulation effect, when the second refractive surface 4 is 15 degrees of slope, uniformity is 0.77.

[0043] Please refer to Figure 10 , Figure 10 is the light efficiency schematic diagram of the embodiment of the lens 100 of the utility model, it is the contrast that has color and gray respectively, see the uniformity simulation effect, when the second refractive surface 4 is 15 degrees of slope, uniformity is 0.77.

[0044] Please refer to Figure 11 , Figure 11 is the light efficiency schematic diagram of the embodiment of the lens 100 of the utility model, it is the contrast that has color and gray respectively, see the uniformity simulation effect, when the second refractive surface 4 is 15 degrees of slope, uniformity is 0.77.

[0045] Please refer to Figure 12 , Figure 12 is the light efficiency schematic diagram of the embodiment of the lens 100 of the utility model, it is the contrast that has color and gray respectively, see the uniformity simulation effect, when the second refractive surface 4 is 15 degrees of slope, uniformity is 0.77.

[0046] Please refer to Figure 13 , Figure 13 is the light efficiency schematic diagram of the embodiment of the lens 100 of the utility model, it is the contrast that has color and gray respectively, see the uniformity simulation effect, when the second refractive surface 4 is 15 degrees of slope, uniformity is 0.77.

[0047] Please refer to Figure 14 , Figure 14The lens 100 is applied to the light efficiency schematic diagram of 7 light source plates, and the contrast of color and gray is presented respectively.

[0048] In summary, according to the lens with the first refractive surface and the second refractive surface in the embodiment of the present application, the light efficiency can be improved and the uniformity can be avoided to reduce when the stacked light source pieces are solved. In addition, the light uniformity is improved through the synergistic effect of the first curve segment, the second curve segment and the refractive surface, so that the light output uniformity of the surface lamp is significantly improved. In addition, the second angle light of the light source piece is effectively utilized after twice total reflection, and the overall light efficiency is improved. Furthermore, the inclined surface design of the second refractive surface reduces the lens weight by about 15%, and increases the heat dissipation space of the light source piece, and reduces the risk of heat debonding. The multiple lenses can meet the application of multiple light source arrangement, and the light mixing effect is good.

[0049] It should be noted that although the above embodiments have been described in this paper, the patent protection scope of the present application is not limited thereby. Therefore, based on the innovative concept of the present application, the changes and modifications of the embodiments described in this paper, or the equivalent structure or equivalent process transformation made by using the content of the present application specification and drawings, directly or indirectly apply the above technical solutions to other related technical fields, which are all included in the protection scope of the patent of the present application.

Claims

1. A lens for improving the light emission uniformity of a panel light, adapted to be placed on a light source member, characterized in that: The lens comprises a main body having a top surface and a bottom surface, the main body comprising a first refractive surface located at the top surface of the main body, an incident cavity inwardly recessed from the bottom surface of the main body to the top surface, the incident cavity having an opening portion; the main body further comprising a second refractive surface annularly arranged at the bottom surface of the main body and surrounding the opening portion of the incident cavity, the light source located below the opening portion, the main body configured to receive light from the light source via the incident cavity, and the light having a first incident angle being emitted via the first refractive surface, the light having a second incident angle being totally reflected via the second refractive surface and then emitted from the first refractive surface, the first angle being smaller than the second angle, the incident cavity having an inner contour line comprising a first curve segment and a second curve segment, the intersection of the first curve segment and the second curve segment forming an intersection point, and the intersection point being connected to the intersection of the median line of the light source and the light emitting surface of the light source, the connecting line forming an angle of 35 degrees with the light emitting surface of the light source and an angle of 55 degrees with the median line of the light source, the second refractive surface forming an angle of 0-20 degrees with the light emitting surface of the light source.

2. The lens that improves the light uniformity of the panel light according to claim 1, characterized in that: The light source comprises a package, a phosphor layer and a chip located in the package, the chip being located at the center of the package.

3. The lens that improves the light uniformity of the panel light according to claim 1, characterized in that: The opening portion of the incident cavity has a center point corresponding to the light emitting point of the light emitting surface of the light source, the outer side to the inner side of the second refractive surface is a slope, the inner side of the second refractive surface protrudes outwardly from the bottom surface of the main body and connects the opening portion, the slope angle of the second refractive surface matches the light intensity distribution of the light source, and effective total reflection of light is achieved.

4. The lens that improves the light uniformity of a panel light according to claim 1, characterized in that: When the second refractive surface forms an angle of 12.5 degrees with the light emitting surface of the light source, the light uniformity is above 0.

85.

5. The lens that improves the light uniformity of a panel light according to claim 1, characterized in that: The profile line of the first refractive surface is a spline curve, when the angle between the connecting line of any point of the profile line of the first refractive surface and the center point of the opening portion and the light emitting surface of the light source is 0 degrees to 35 degrees, the curvature of the curve gradually decreases.

6. The lens that improves the light uniformity of a panel light according to claim 1, characterized in that: When the angle between the first refractive surface and the median line of the light emitting surface of the light source is greater than 35 degrees, the curvature of the curve gradually increases, and the increasing rate of the curvature of the curve matches the light intensity distribution curve of the light source.

7. The lens that improves the uniformity of light emission of a panel light according to claim 1, characterized by: The top surface of the main body has a recess corresponding to the upper side of the light source.

8. The lens that improves the light uniformity of a panel light according to claim 1, characterized in that: The lens comprises a plurality of microstructures annularly arranged on the second refractive surface.

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