A secondary light mixing LED lens and lamp

Abstract

The present invention discloses a secondary light mixing LED lens, comprising an incident area, an exit area and a reflection area, wherein the incident area is provided with a groove for placing a light source, the top wall of the groove constitutes a first incident surface, the side wall of the groove constitutes a second incident surface, and the exit area comprises a first exit surface and a second exit surface surrounding the first exit surface; a first portion of light is emitted after passing through the first incident surface and the first exit surface, and the first incident surface and / or the first exit surface comprise a compound eye surface; a second portion of light is emitted after passing through the second incident surface, the reflection area and the second exit surface, at least one of the second incident surface, the reflection area and the second exit surface is a first target surface, at least one of the second incident surface, the reflection area and the second exit surface is a second target surface, and the first target surface and the second target surface are located in different areas, the first target surface comprises a first protrusion unit arranged along the radial direction of a rotating body, and the second target surface comprises a second protrusion unit arranged along the circumferential direction of the rotating body.

Description

Technical Field

[0001] The invention relates to a lens, in particular to a secondary light mixing LED lens and a lamp. Background Art

[0002] Light Emitting Diode (LED) has the characteristics of power saving, light weight and long life. Semiconductor lighting products using LED are currently common environmentally friendly and energy-saving products. At present, the packaging structure of semiconductor lighting products is to directly cover the surface of the LED chip with phosphor, and the monochromatic light emitted by the LED chip excites the phosphor to emit light, which is mixed with the monochromatic light not absorbed by the phosphor to produce white light, and then covered with a lens to improve the light output efficiency of the LED. However, due to the structural characteristics of LED lighting products, it is inevitable that the color temperature at the LED chip is higher and the color temperature at the phosphor is lower, that is, the color temperature difference is caused by the structural characteristics of LED lighting products, especially in the near light field. The color temperature difference is more obvious. Summary of the invention

[0003] The purpose of the present invention is to provide a secondary light mixing LED lens and lamp to solve the problem in the prior art that the color temperature difference is caused by the packaging characteristics of LED lighting products, especially the obvious color temperature difference in the near light field.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A secondary light mixing LED lens comprises a rotating body, wherein an incident area and an exit area are arranged on the rotating body, an outer wall surface between the exit area and the incident area forms a reflection area, the incident area is provided with a groove for placing a light source, the top wall of the groove constitutes a first incident surface, the side wall of the groove constitutes a second incident surface, the exit area comprises a first exit surface and a second exit surface, the second exit surface surrounds the first exit surface,

[0006] The first part of the light emitted by the light source is emitted after passing through the first incident surface and the first exit surface, the first incident surface and / or the first exit surface comprises a compound eye surface formed by a combination of a plurality of third convex units, and the third convex units have curvatures in both the circumferential direction and the radial direction of the rotating body;

[0007] The second part of the light emitted by the light source is emitted after passing through the second incident surface, the reflection area, and the second exit surface. At least one of the second incident surface, the reflection area, and the second exit surface is a first target surface. At least one of the second incident surface, the reflection area, and the second exit surface is a second target surface. The first target surface and the second target surface are located in different areas (that is, the first target surface and the second target surface do not overlap and are two independent surfaces). The first target surface includes a plurality of first protrusion units arranged along the radial direction of the rotating body, and each of the first protrusion units has a curvature in the circumferential direction of the rotating body. The second target surface includes a plurality of second protrusion units arranged along the circumferential direction of the rotating body, and each of the second protrusion units has a curvature in the radial direction of the rotating body.

[0008] The principle of the present invention is:

[0009] The first part of the light emitted by the light source is emitted after passing through the first incident surface and the first exit surface. Since this part of the light is close to the light source and has not been reflected by the reflection surface, the expansion amount of this part of the light in the circumferential and radial directions is large. Therefore, it is necessary to set a compound eye surface formed by a combination of third protrusion units on the first incident surface and / or the first exit surface, and the third protrusion unit has an arc in both the circumferential and radial directions of the rotating body. The third protrusion unit is used to mix the light in both the circumferential and radial directions to reduce the color temperature difference;

[0010] The second part of the light emitted by the light source is emitted after passing through the second incident surface, the reflection area, and the second exit surface. This part of the light still has a large expansion in the circumferential and radial directions, and requires a first protrusion unit arranged radially along the rotating body and a second protrusion unit arranged circumferentially along the rotating body. The first protrusion unit is used to mix the circumferential light, and the second protrusion unit is used to mix the radial light. The color temperature difference is reduced through secondary light mixing.

[0011] In summary, the present invention uses different cylindrical or spherical surfaces on the surface of the LED lens to achieve radial and circumferential dual mixing of the light source, thereby achieving secondary light mixing, reducing color temperature differences, and making the light spot color more consistent and uniform.

[0012] As a preferred solution of the present invention, the compound eye surface is formed by a plurality of the third convex units arranged in an array.

[0013] As a preferred embodiment of the present invention, the third protrusion units are arranged in a ring array, or the third protrusion units are arranged in a honeycomb array.

[0014] As a preferred solution of the present invention, the compound eye surface is formed by arranging a plurality of the third protrusion units along a spiral line. In this arrangement method, the regularity of each third protrusion unit is weak, making it difficult for the corresponding light to form an image and not easy to present the initial defects of the LED light source on the light spot.

[0015] As a preferred embodiment of the present invention, the spiral wire is a Fermat mule wire.

[0016] As a preferred embodiment of the present invention, the distribution diameter of the exit area along the direction perpendicular to the lens optical axis is 0 to D, the distribution diameter of the first exit surface along the direction perpendicular to the lens optical axis is 0 to D1, and the distribution diameter of the second exit surface along the direction perpendicular to the lens optical axis is D1 to D, wherein 0.2D≤D1≤0.8D.

[0017] As a preferred solution of the present invention, the first protrusion unit and the second protrusion unit are both cylindrical protrusions, and the third protrusion unit is a spherical protrusion or an aspherical protrusion.

[0018] As a preferred solution of the present invention, all the first protrusion units are distributed over the first target surface, and all the second protrusion units are distributed over the second target surface.

[0019] As a preferred solution of the present invention, the lowest point of the first emitting surface is lower than the lowest point of the second emitting surface. This arrangement can change the emitting mode of the large-angle light that undergoes interface reflection, making the light spot more uniform and more convenient for injection molding production.

[0020] As a preferred solution of the present invention, the first emission surface includes unit surface 1 and unit surface 2, the unit surface 2 surrounds the unit surface 1, and the lowest point of the unit surface 1 is lower than the highest point of the unit surface 2. Similarly, the emission mode of the large-angle light reflected by the interface can be changed to make the light spot more uniform and more convenient for injection molding production.

[0021] As a preferred solution of the present invention, the first emitting surface includes unit surface 1 and unit surface 2, the unit surface 2 surrounds the unit surface 1, and the lowest point of the unit surface 1 is lower than the highest point of the unit surface 2, and the lowest point of the unit surface 2 is lower than the lowest point of the second emitting surface. Similarly, the emitting mode of the large-angle light reflected by the interface can be changed to make the light spot more uniform and more convenient for injection molding production.

[0022] The invention also discloses a lamp, comprising any one of the secondary light mixing LED lenses.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] The present invention uses different cylindrical or spherical surfaces on the surface of the LED lens, so that the light of the light source is mixed radially and annularly, thereby realizing secondary light mixing, reducing the color temperature difference and making the light spot color more consistent and uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the secondary light mixing LED lens described in Example 1 of the present invention.

[0026] Figure 2 4 is a top view of the secondary light mixing LED lens described in Example 1 of the present invention.

[0027] Figure 3 4 is a bottom view of the secondary light mixing LED lens described in Example 1 of the present invention.

[0028] Figure 4 It is a front view of the secondary light mixing LED lens described in Example 1 of the present invention.

[0029] Figure 5 It is a side view of the secondary light mixing LED lens described in Example 1 of the present invention.

[0030] Figure 6 yes Figure 2 AA section view in.

[0031] Figure 7 yes Figure 2 BB section view in.

[0032] Figure 8 1 is a light path diagram (radial direction) of the first part of the light of the light source described in Example 1 of the present invention.

[0033] Fig. 9 4 is a light path diagram (circular) of the first part of the light of the light source described in Example 1 of the present invention.

[0034] Fig.10 3 is a light path diagram (radial direction) of the second part of the light of the light source described in Example 1 of the present invention.

[0035] Fig.11 4 is a light path diagram (circular) of the second part of the light of the light source described in Example 1 of the present invention.

[0036] Fig.12 The figure is a comparison diagram of color temperature distribution of an LED lens adopting the secondary light mixing described in the present invention and a conventional lens.

[0037] Fig.13 Schematic diagram of the three-dimensional structure of the LED lens for secondary light mixing according to Example 2 of the present invention Figure 1 .

[0038] Fig.14 Schematic diagram of the three-dimensional structure of the LED lens for secondary light mixing according to Example 2 of the present invention Figure 2 .

[0039] Fig.15 4 is a top view of the secondary light mixing LED lens described in Example 2 of the present invention.

[0040] Fig.16 It is a bottom view of the secondary light mixing LED lens described in Example 2 of the present invention.

[0041] Fig.17 It is a front view of the secondary light mixing LED lens described in Example 2 of the present invention.

[0042] Fig.18 Schematic diagram of the three-dimensional structure of the LED lens for secondary light mixing according to Example 3 of the present invention Figure 1 .

[0043] Fig.19 Schematic diagram of the three-dimensional structure of the LED lens for secondary light mixing according to Example 3 of the present invention Figure 2 .

[0044] Fig. 20 1 is a bottom view of the secondary light mixing LED lens described in Example 3 of the present invention.

[0045] Fig.21 It is a front view of the secondary light mixing LED lens described in Example 3 of the present invention.

[0046] Fig. 22 Schematic diagram of the three-dimensional structure of the LED lens for secondary light mixing according to Example 4 of the present invention Figure 1 .

[0047] Fig.23 Schematic diagram of the three-dimensional structure of the LED lens for secondary light mixing according to Example 4 of the present invention Figure 2 .

[0048] Fig.24 4 is a top view of the secondary light mixing LED lens described in Example 4 of the present invention.

[0049] Fig.25 It is a front view of the secondary light mixing LED lens described in Example 4 of the present invention.

[0050] Fig.26 It is a cross-sectional view of the secondary light mixing LED lens described in Example 4 of the present invention.

[0051] Fig. 27 It is a schematic diagram of the three-dimensional structure of the secondary light mixing LED lens described in Example 5 of the present invention.

[0052] Fig.28 4 is a top view of the secondary light mixing LED lens described in Example 5 of the present invention.

[0053] Fig.29 It is a cross-sectional view of the secondary light mixing LED lens described in Example 5 of the present invention.

[0054] Icon: 1-incident area, 11-first incident surface, 12-second incident surface, 2-reflection area, 3-exit area, 31-first exit surface, 311-unit surface one, 312-unit surface two, 32-second exit surface, 4-groove, 5-third protruding unit, 6-first protruding unit, 7-second protruding unit. DETAILED DESCRIPTION

[0055] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0056] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0057] Example 1

[0058] like Figure 1-Figure 7 As shown, a secondary light mixing LED lens includes a rotating body, on which an incident area 1 and an exit area 3 are provided, the outer wall between the exit area 3 and the incident area 1 forms a reflection area 2, and the incident area 1 is provided with a groove 4 for placing a light source.

[0059] The top wall of the groove 4 forms a first incident surface 11 , and the side walls of the groove 4 form a second incident surface 12 .

[0060] The exit area 3 includes a first exit surface 31 and a second exit surface 32, and the second exit surface 32 surrounds the first exit surface 31. Specifically, the distribution diameter of the exit area 3 along the direction perpendicular to the lens optical axis is 0 to D, the distribution diameter of the first exit surface 31 along the direction perpendicular to the lens optical axis is 0 to D1, and the distribution diameter of the second exit surface 32 along the direction perpendicular to the lens optical axis is D1-D, wherein 0.2D≤D1≤0.8D.

[0061] The first exit surface 31 includes a compound eye surface formed by a combination of multiple third protrusion units 5, the third protrusion unit 5 is a spherical protrusion or an aspherical protrusion, the third protrusion unit 5 has an arc in the circumferential direction and radial direction of the rotating body, the compound eye surface is formed by a plurality of the third protrusion units 5 arranged in an array, the third protrusion units 5 are arranged in a ring array, or the third protrusion units 5 are arranged in a honeycomb array, or the third protrusion units 5 are arranged along a spiral line, the spiral line can be a Fermat spiral, and all the third protrusion units 5 are covered with the first exit surface 31.

[0062] The second emission surface 32 includes a plurality of first protrusion units 6 arranged along the radial direction of the rotating body. The first protrusion units 6 are cylindrical protrusions. Each of the first protrusion units 6 has an arc in the circumferential direction of the rotating body, and all of the first protrusion units 6 cover the second emission surface 32 .

[0063] The reflection area 2 includes a plurality of second protrusion units 7 arranged circumferentially along the rotating body. The second protrusion units 7 are cylindrical protrusions. Each of the second protrusion units 7 has an arc in the radial direction of the rotating body, and all the second protrusion units 7 cover the entire reflection area 2 .

[0064] like Figure 8-Figure 9 As shown, the first part of the light emitted by the light source is emitted after passing through the first incident surface 11 and the first exit surface 31. In this embodiment, a compound eye surface formed by a combination of third convex units 5 is provided on the first exit surface 31. After the light enters the compound eye surface, the third convex unit 5 mixes the light in both the circumferential and radial directions of the rotating body, thereby reducing the color temperature difference;

[0065] Figure 10-11 As shown, the second part of the light emitted by the light source is emitted after passing through the second incident surface 12, the reflection area 2, and the second exit surface 32. In this embodiment, a plurality of second protrusion units 7 arranged along the circumferential direction of the rotating body are arranged in the reflection area 2, and each of the second protrusion units 7 has an arc in the radial direction of the rotating body, and the radial direction of the rotating body is mixed by the second protrusion units 7; then, in this embodiment, a plurality of first protrusion units 6 arranged along the radial direction of the rotating body are also arranged on the second exit surface 32, and each of the first protrusion units 6 has an arc in the circumferential direction of the rotating body, and the circumferential direction of the rotating body is mixed by the first protrusion units 6, and the color temperature difference is reduced by secondary light mixing.

[0066] Fig.12To simulate the color temperature distribution diagram of a 500×500mm area at a distance of 1m from the lens, it can be seen from the figure that compared with the existing conventional lens, the color temperature distribution difference of the secondary light mixing LED lens described in the present invention is smaller. Therefore, the present invention uses different cylindrical or spherical surfaces on the surface of the LED lens to make the light of the light source perform radial and circumferential dual light mixing respectively, thereby achieving secondary light mixing, reducing the color temperature difference, and making the light spot color more consistent and uniform.

[0067] Example 2

[0068] like Figure 13-Figure 17 As shown, the difference between this embodiment and embodiment 1 is that the second protrusion unit 7 is not arranged on the reflection area 2, but on the second incident surface 12. Similarly, it is possible to achieve light mixing of the second part of the light emitted by the light source.

[0069] Example 3

[0070] like Figure 18-Figure 21 As shown, the difference between this embodiment and embodiment 1 is that the second protrusion unit 7 is arranged both in the reflection area 2 and in the second incident surface 12, and the second protrusion unit 7 does not cover the entire reflection area, and the second protrusion unit 7 does not cover the entire second incident surface. Similarly, it is possible to achieve light mixing of the second part of the light emitted by the light source.

[0071] Example 4

[0072] like Figure 22-Figure 26 As shown, the difference between this embodiment and embodiment 1 is that the first exit surface 31 includes unit surface 1 311 and unit surface 2 312, the unit surface 2 312 surrounds the unit surface 1 311, and the lowest point of the unit surface 1 311 is lower than the highest point of the unit surface 2 312, and the lowest point of the unit surface 2 312 is lower than the lowest point of the second exit surface 32. That is, the first exit surface 31 sinks as a whole, and sinks in two layers. In this way, the exit mode of large-angle light that undergoes interface reflection can be changed, making the light spot more uniform.

[0073] As a variation, the first exit surface 31 may be only partially sunken, that is, compared with Example 1, only the unit surface 1 311 sinks, and the unit surface 2 312 does not sink (consistent with Example 1), and the lowest point of the unit surface 1 311 is lower than the highest point of the unit surface 2 312.

[0074] As a variation and transformation method, the first exit surface 31 sinks as a whole but is not layered, that is, the unit surface 1 311 and the unit surface 2 312 sink to the same height, and the lowest point of the first exit surface 31 is lower than the lowest point of the second exit surface 32 .

[0075] The third protruding units 5 are fully distributed on the first unit surface 311 and the second unit surface 312. Similarly, the first part of the light emitted by the light source can be mixed.

[0076] Example 5

[0077] like Figure 27-Figure 29 As shown, the difference between this embodiment and embodiment 4 is that the first protrusion units 6 do not completely cover the second emission surface 32. Similarly, it is possible to achieve light mixing of the second part of the light emitted by the light source.

[0078] Example 6

[0079] A lamp comprises a secondary light mixing LED lens as described in any one of embodiments 1-5.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A secondary light mixing LED lens, comprising a rotating body, wherein an incident area and an exit area are provided on the rotating body, an outer wall surface between the exit area and the incident area forms a reflection area, and the incident area is provided with a groove for placing a light source, characterized in that: The top wall of the groove constitutes a first incident surface, the side wall of the groove constitutes a second incident surface, the exit area includes a first exit surface and a second exit surface, and the second exit surface surrounds the first exit surface. The first incident surface and / or the first exit surface comprises a compound eye surface formed by a combination of a plurality of third convex units, and the third convex units have curvatures in both the circumferential direction and the radial direction of the rotating body; At least one of the second incident surface, the reflection area, and the second exit surface is a first target surface, at least one of the second incident surface, the reflection area, and the second exit surface is a second target surface, and the first target surface and the second target surface are located in different areas, the first target surface includes a plurality of first protrusion units arranged along the radial direction of the rotating body, each of the first protrusion units has an arc in the circumferential direction of the rotating body, and the second target surface includes a plurality of second protrusion units arranged along the circumferential direction of the rotating body, each of the second protrusion units has an arc in the radial direction of the rotating body; The lowest point of the first exit surface is lower than the lowest point of the second exit surface. The first exit surface includes unit surface one and unit surface two. The unit surface two surrounds the unit surface one, and the lowest point of the unit surface one is lower than the highest point of the unit surface two, and the lowest point of the unit surface two is lower than the lowest point of the second exit surface, thereby changing the exit mode of large-angle light that undergoes interface reflection.

2. The secondary light mixing LED lens according to claim 1, characterized in that: The compound eye surface is formed by a plurality of the third convex units arranged in an array.

3. The secondary light mixing LED lens according to claim 2, characterized in that: The third protrusion units are arranged in a ring array, or the third protrusion units are arranged in a honeycomb array.

4. The secondary light mixing LED lens according to claim 1, characterized in that: The compound eye surface is formed by a plurality of the third protrusion units arranged along a spiral line.

5. The secondary light mixing LED lens according to claim 4, characterized in that: The spiral is a Fermat spiral.

6. The secondary light mixing LED lens according to claim 1, characterized in that: The distribution diameter of the exit area along the direction perpendicular to the lens optical axis is 0 to D, the distribution diameter of the first exit surface along the direction perpendicular to the lens optical axis is 0 to D1, and the distribution diameter of the second exit surface along the direction perpendicular to the lens optical axis is D1 to D, wherein 0.2D≤D1≤0.8D.

7. A secondary light mixing LED lens according to any one of claims 1 to 6, characterized in that: The first protrusion unit and the second protrusion unit are both cylindrical protrusions, and the third protrusion unit is a spherical protrusion or an aspherical protrusion.

8. A secondary light mixing LED lens according to any one of claims 1 to 6, characterized in that: All the first protrusion units cover the first target surface, and all the second protrusion units cover the second target surface.

9. A lamp, characterized in that: It comprises a secondary light mixing LED lens as described in any one of claims 1-8.

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