Light mixing lens assembly and illumination device

Abstract

The invention relates to the technical field of illumination apparatuses, and provides a light mixing lens assembly. The light mixing lens assembly comprises a mounting barrel provided with a light exit port; and a first lens and a second lens which are arranged in the mounting barrel and are distributed in an axial direction of the mounting barrel, wherein the second lens is located between the first lens and the light exit port; the first lens is a convex lens, and a plurality of first microstructures are provided on a light entry surface or a light exit surface of the first lens, forming a first microstructure surface for performing primary light mixing on incident light; and a plurality of second microstructures are provided on a light entry surface or a light exit surface of the second lens, forming a second microstructure surface for performing secondary light mixing on the incident light. In the present application, light rays emitted by the light source are mixed and converged at the same time by the first lens, and the converged light rays are then mixed for a second time by the second lens, thereby improving the color mixing uniformity of outgoing spots, while preventing the outgoing spots from being enlarged due to the effect of the microstructure surfaces.

Description

Mixed light lens assembly and lighting device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023236675502, filed on December 29, 2023, entitled “Mixing lens assembly and lighting device,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application relates to the technical field of lighting equipment, and in particular to a light-mixing lens assembly and a lighting device. Background Art

[0004] Many current lighting devices use multi-color integrated chip lamps as light sources to produce illumination with varying color temperatures. To achieve uniform color temperature, a light-mixing lens is typically positioned in the direction of the light source's output. This lens incorporates a light-mixing structure that mixes the light from the different color sources before emitting it. However, due to the large spacing between the lamps, existing light-mixing lenses still offer poor light mixing performance, leading to uneven color mixing and a larger light spot in practice. Summary of the Invention

[0005] The present application provides a light-mixing lens assembly and an illumination device, which are used to solve the problems in the prior art that the light-mixing lens in the illumination device is prone to uneven color mixing and larger light spots.

[0006] The present application provides a light-mixing lens assembly, comprising:

[0007] The installation tube is provided with a light outlet;

[0008] A first lens and a second lens are disposed in the mounting tube and distributed along the axial direction of the mounting tube, wherein the second lens is located between the first lens and the light outlet;

[0009] Among them, the first lens is a convex lens and its light incident surface or light exit surface is provided with multiple first microstructures to form a first microstructure surface for performing primary mixing of incident light; the light incident surface or light exit surface of the second lens is provided with multiple second microstructures to form a second microstructure surface for performing secondary mixing of incident light.

[0010] Optionally, the light mixing lens assembly provided in this application further includes:

[0011] A light-mixing film is disposed in the mounting tube and located between the second lens and the light outlet.

[0012] Optionally, the second lens is provided with a first area and a second area, the first area is located at the center of the light incident surface or the light exit surface of the second lens, the second area surrounds the first area, and the second microstructure is disposed in the first area.

[0013] Optionally, the projection of each one or more adjacent first microstructures toward the light outlet overlaps at most partially with the projection of any one or more adjacent second microstructures toward the light outlet.

[0014] Optionally, the plurality of first microstructures are adjacent to each other and arranged in a petal grid.

[0015] Optionally, the petal grid is formed by interweaving a plurality of Fibonacci spiral lines.

[0016] Optionally, the plurality of second microstructures are adjacent to each other and arranged in a multi-layer circular pattern from the center of the second microstructure surface outward.

[0017] Optionally, at least one of the first microstructure and the second microstructure is a beaded particle.

[0018] Optionally, the inner wall surface of the mounting tube is provided with a first step surface and a second step surface, the first step surface faces the light outlet, and the second step surface faces away from the light outlet;

[0019] The first lens includes a lens portion and a plurality of hooks connected to the lens portion. The first lens is engaged with the first step surface through the plurality of hooks. The second lens and the light mixing film are in contact between the second step surface and the first lens.

[0020] The present application also provides a lighting device, comprising a housing, a light source and any one of the above-mentioned mixed light lens assemblies, wherein the light source is provided with light-emitting bodies of at least two colors, the light source and the lens assembly are arranged in the housing, and the lens assembly is located on the light-emitting side of the light source.

[0021] Optionally, the light source is fixedly connected to the housing, and the mounting tube is threadedly connected to the housing, so that the light mixing lens assembly can be moved closer to or farther away from the light source.

[0022] The light-mixing lens assembly and lighting device provided by the present application are configured by simultaneously disposing a first lens and a second lens in a mounting tube toward the light outlet. The first lens is configured as a convex lens, and a first microstructured surface is disposed on its light-entry or light-exit surface. A second microstructured surface is disposed on the light-entry or light-exit surface of the second lens. The first lens mixes the light emitted by the light source while also converging the light. The converged light is then subjected to a secondary light mixing by the second lens, effectively enhancing the light-mixing effect and the uniformity of the color mixing of the emitted light spot. At the same time, the emitted light spot will not be enlarged due to the influence of the microstructured surface. This application is applied to spotlights, and can improve the color mixing uniformity of the spotlight while ensuring that the spotlight emits light at a small angle.

[0023] Furthermore, the lighting device provided in the present application also has the various advantages described above because it is equipped with the light mixing lens assembly described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] FIG1 is a schematic structural diagram of a lighting device provided in an embodiment of the present application;

[0026] FIG2 is a schematic diagram of the structure of the light incident side of the second lens in the light mixing lens assembly provided in an embodiment of the present application;

[0027] FIG3 is a schematic diagram of the structure of the light-emitting side of the first lens in the light-mixing lens assembly provided in an embodiment of the present application;

[0028] FIG4 is a schematic diagram of the structure of the light incident side of the second lens in the light mixing lens assembly provided in an embodiment of the present application;

[0029] FIG5 is a schematic diagram of the structure of the light-emitting side of the second lens in the light-mixing lens assembly provided in an embodiment of the present application;

[0030] FIG6 is a schematic diagram of the mounting tube structure of the light mixing lens assembly provided in an embodiment of the present application;

[0031] FIG7 is a schematic diagram of the installation of a light source and a housing in a lighting device provided in an embodiment of the present application;

[0032] Reference numerals:

[0033] 100. Mixing lens assembly; 11. Mounting tube; 111. Light outlet; 112. First step surface; 113. Second step surface; 12. First lens; 121. First light incident surface; 1211. First microstructure surface; 12111. First microstructure; 122. First light exit surface; 123. First support body; 1231. Hook; 13. Second lens; 131. Second light incident surface; 1311. Second microstructure surface; 13111. Second microstructure; 1312. Second region; 132. Second light exit surface; 133. Second support body; 14. Mixing film; 200. Housing; 300. Light source; 31. Mounting seat; 32. Light source board; 321. Lamp beads. DETAILED DESCRIPTION

[0034] To make the purpose, technical solution, and advantages of this embodiment more clear, the technical solution of this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of this embodiment, not all of it. Based on the embodiments in this embodiment, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this embodiment.

[0035] In the description of this embodiment, it should be noted that, unless otherwise clearly specified and limited, the terms "first" and "second" are for the purpose of clearly explaining the numbering of product components and do not represent any substantial difference. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to the specific circumstances. In addition, the meaning of "multiple" is two or more. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to the specific circumstances.

[0036] The light mixing lens assembly of this embodiment is described below with reference to FIG. 1 to FIG. 7 .

[0037] As shown in Figure 1, the light mixing lens assembly 100 provided in this embodiment includes a mounting tube 11, a first lens 12 and a second lens 13. The mounting tube 11 is provided with a light outlet 111. The first lens 12 and the second lens 13 are arranged in the mounting tube 11 and distributed along the axial direction of the mounting tube 11, and the second lens 13 is located between the first lens 12 and the light outlet 111. Among them, the first lens 12 is a convex lens and its light incident surface or light exit surface is provided with a first microstructure 12111, forming a first microstructure surface 1211, which is used to perform primary light mixing on the incident light. The light incident surface or light exit surface of the second lens 13 is provided with a second microstructure 13111, forming a second microstructure surface 1311, which is used to perform secondary light mixing on the incident light.

[0038] 2-5 , the first light incident surface 121 of the first lens 12 and the second light incident surface 131 of the second lens 13 are both surfaces away from the light exit 111 , and the first light exit surface 122 of the first lens 12 and the second light exit surface 132 of the second lens 13 are both surfaces facing the light exit 111 .

[0039] The light mixing lens assembly is used to be installed on the light emitting side of the light source. The multi-color light emitted by the light source is sequentially mixed twice by the first lens 12 and the second lens 13 and then emitted from the light outlet 111.

[0040] At least one of the first light incident surface 121 and the first light exit surface 122 of the first lens 12 is a convex surface, so that the first lens 12 has a converging effect on the light emitted by the light source, and the converged light is then mixed again by the second lens 13. Optionally, as shown in Figure 5, the first light exit surface 122 of the first lens 12 is set to be a convex surface.

[0041] The light-mixing lens assembly 100 provided in this embodiment is configured by simultaneously disposing a first lens 12 and a second lens 13 within a mounting tube 11 in a direction toward a light outlet 111. The first lens 12 is configured as a convex lens, and a first microstructured surface 1211 is provided on its light-entry or light-exit surface. A second microstructured surface 1311 is provided on the light-entry or light-exit surface of the second lens 13. The first lens 12 mixes the light emitted by the light source while also converging the light. The converged light is then subjected to a secondary light mixing by the second lens 13, effectively enhancing the light-mixing effect and the uniformity of the color mixing of the emitted light spot. At the same time, the emitted light spot will not be enlarged due to the influence of the microstructured surface. This embodiment is applied to spotlights, and can improve the color mixing uniformity of the spotlight while ensuring that the spotlight emits light at a small angle.

[0042] Furthermore, the light-mixing lens assembly 100 provided in this embodiment further includes a light-mixing film 14 . The light-mixing film 14 is disposed in the mounting tube 11 and located between the second lens 13 and the light outlet 111 .

[0043] Specifically, micron-scale microstructures are distributed on the light mixing film 14. After light is mixed twice by the first lens 12 and the second lens 13, it is mixed as a whole by the light mixing film 14, which further improves the light mixing effect and the uniformity of the color mixing of the output light spot.

[0044] 2 , in this embodiment, the second lens 13 has a first region and a second region 1312. The first region is located at the center of the light incident surface or the light exit surface of the second lens 13, the second region 1312 surrounds the first region, and the second microstructure 13111 is disposed in the first region.

[0045] It can be understood that the entire surface of the first light incident surface 121 or the first light emitting surface 122 of the first lens 12 is set as a first microstructure surface 1211, that is, multiple first microstructures 12111 are distributed over the first light incident surface 121 or the first light emitting surface 122 of the first lens 12 to mix all the light emitted by the light source.

[0046] Only the first, central region of the second lens 13 is provided with the second microstructure 13111, forming the second microstructure 13111 in the first region. When the second microstructure surface 1311 is provided on the second light incident surface 131 of the second lens 13, as shown in Figures 2 and 3, the second microstructure surface 1311 is provided in the central region of the second light incident surface 131, while the edge regions of the second light incident surface 131 and the second light emitting surface 132 are not provided with any microstructures for light mixing. When the second microstructure surface 1311 is provided on the second light emitting surface 132 of the second lens 13, the second microstructure surface 1311 is provided in the central region of the second light emitting surface 132, while the edge regions of the second light emitting surface 132 and the second light incident surface 131 are not provided with any microstructures for light mixing.

[0047] This embodiment provides a second microstructure 13111 in the central region of the light-entry or light-exit surface of the second lens 13, forming a second microstructure surface 1311. This allows light rays emitted from the first lens 12, which are poorly mixed in the middle portion, to be further mixed after passing through the second microstructure surface 1311 of the second lens 13. Light rays from the edge portions, which are less likely to experience poor mixing, are no longer mixed. Consequently, the second microstructure surface 1311 does not affect the overall optical angle of the light rays emitted from the second lens 13. In other words, the size of the light spot emitted from the first lens 12 is comparable to that emitted from the second lens 13, meaning that the light spot emitted from the second lens 13 is not enlarged due to the influence of the second microstructure surface 1311. This embodiment significantly improves the color mixing uniformity of the emitted light spot while ensuring a small light spot.

[0048] In this embodiment, the projections of one or more adjacent first microstructures 12111 toward the light outlet 111 and the projections of one or more adjacent second microstructures 13111 toward the light outlet 111 at most partially overlap.

[0049] It is understood that the plurality of first microstructures 12111 and the plurality of second microstructures 13111 can be arranged randomly or according to a specific rule. In the case where the plurality of first microstructures 12111 and the plurality of second microstructures 13111 are both arranged according to a specific rule, the arrangement of the plurality of first microstructures 12111 is different from the arrangement of the plurality of second microstructures 13111.

[0050] Specifically, due to different arrangements, the projections of each plurality of adjacent first microstructures 12111 toward the light outlet 111 do not overlap, or only partially overlap, with the projections of any plurality of adjacent second microstructures 13111 toward the light outlet 111. For example, the projections of each three adjacent first microstructures 12111 toward the light outlet 111 do not overlap, or only partially overlap, with the projections of any three adjacent second microstructures 13111 toward the light outlet 111.

[0051] Alternatively, due to different arrangements, the projection of each first microstructure 12111 toward the light outlet 111 does not overlap or only partially overlaps with the projection of any second microstructure 13111 toward the light outlet 111. In this case, the overlap between the projections of the multiple first microstructures 12111 and the multiple second microstructures 13111 toward the light outlet 111 is minimal.

[0052] In related technologies, the microstructures used for light mixing on the lens are generally arranged in a regular pattern, such as hexagons, circles, etc., resulting in the light spot obtained after light mixing through the lens having patterns of specific shapes, such as circles, hexagons, etc., which affects the final light mixing effect.

[0053] In this embodiment, a first lens 12 and a second lens 13 are provided, and two microstructure surfaces with different microstructure arrangements are provided on the first lens 12 and the second lens 13. This allows the first lens 12 and the second lens 13 to mix light in different ways. This can largely prevent the appearance of specific shaped patterns in the light spot while ensuring uniform light mixing, thereby improving the light mixing effect.

[0054] As shown in FIG4 , in an optional embodiment, the plurality of first microstructures 12111 are adjacent to each other and arranged in a petal grid. Specifically, the plurality of first microstructures 12111 are arranged in a petal grid with the center of the first lens 12 as the center.

[0055] The petal grid can be formed by interweaving multiple Fibonacci spirals. That is, multiple first microstructures 12111 are arranged into multiple Fibonacci spirals, and the multiple Fibonacci spirals are arranged around the center of the first lens 12 and spread outward from the center of the first lens 12 layer by layer, thereby forming a layered petal grid.

[0056] It should be noted that the petal grid can also be formed by interweaving multiple other types of spirals, such as Archimedean spirals. Arranging multiple first microstructures 12111 in a spiral arrangement can avoid the formation of specific shaped patterns in the light spot obtained after light mixing, which is conducive to improving the light mixing effect.

[0057] As shown in FIG2 , in an optional embodiment, the plurality of second microstructures 13111 are adjacent to each other and arranged in a multi-layer circular pattern outward from the center of the second microstructure surface 1311. Specifically, the plurality of second microstructures 13111 are arranged in a plurality of adjacent concentric circles with the center of the second lens 13 as the center.

[0058] In this embodiment, at least one of the first microstructure 12111 and the second microstructure 13111 is a beaded surface. In other words, at least one of the first microstructure surface 1211 and the second microstructure surface 1311 is a beaded surface formed by connecting multiple beaded surfaces. Each beaded surface particle is of similar size.

[0059] It should be noted that the first microstructure surface 1211 and the second microstructure surface 1311 in this embodiment are not limited to beaded surfaces; they can also be other microstructured surfaces such as scales. This embodiment does not impose any specific restrictions on this, as long as they can achieve a certain light mixing effect. The arrangement of the multiple first microstructures 12111 in this embodiment is not limited to the petal grid arrangement described above, and the arrangement of the multiple second microstructures 13111 is not limited to the multi-layer circular arrangement described above. In practice, they can be flexibly arranged according to needs or process conditions.

[0060] As a specific example, the first microstructure 12111 and the second microstructure 13111 are both beaded particles, multiple first microstructures 12111 are adjacent to each other and arranged in a petal grid, which is formed by interweaving multiple Fibonacci spiral lines, and multiple second microstructures 13111 are adjacent to each other and arranged in multiple layers of circles from the center of the second microstructure surface 1311 to the outside.

[0061] As shown in Figure 6, in this embodiment, the inner wall surface of the mounting tube 11 is provided with a first stepped surface 112 and a second stepped surface 113. The first stepped surface 112 faces the light outlet 111, while the second stepped surface 113 faces away from the light outlet 111. The first lens 12 includes a first lens portion and a plurality of hooks 1231 connected to the first lens portion. The first lens 12 is engaged with the first stepped surface 112 via the plurality of hooks 1231. The second lens 13 and the light-mixing film 14 abut between the second stepped surface 113 and the first lens 12.

[0062] The mounting tube 11 is a cylindrical structure with two ends open, one end of which is open to form a light outlet 111. When assembling the light-mixing lens assembly, the light-mixing film 14, the second lens 13, and the first lens 12 are sequentially placed into the mounting tube 11 from the end of the mounting tube 11 away from the light outlet 111.

[0063] Specifically, the light-mixing film 14 is first positioned on the second stepped surface 113 within the mounting tube 11. The second stepped surface 113 is used to limit the distance between the light-mixing film 14 and the light outlet 111. Then, the second lens 13 is pushed into the mounting tube 11, and the light-mixing film 14 is pressed against the second stepped surface 113. Finally, the first lens 12 is pushed into the second stepped surface 113, so that the multiple hooks 1231 engage with the first stepped surface 112, thereby achieving a snap connection between the first lens 12 and the mounting tube 11. Simultaneously, the second lens 13 and the light-mixing film 14 are pressed against the first lens 12 and the second stepped surface 113.

[0064] It should be noted that the placement of the light-mixing film 14 can be adjusted based on the hardness of the material of the light-mixing film 14. If the light-mixing film 14 is made of a relatively hard material, the light-mixing film 14 can be placed in the same assembly manner as described above. If the light-mixing film 14 is made of a relatively soft material, the light-mixing film 14 can be first attached to the second light-emitting surface 132 of the second lens 13, and then the second lens 13 and the light-mixing film 14 can be placed between the first lens 12 and the second stepped surface 113.

[0065] Specifically, the first lens 12 includes a first lens portion and a first support 123 connected to the periphery of the first lens portion. The first support 123 includes a plurality of hooks 1231, for example, three hooks 1231 are evenly arranged around the first lens portion as shown in FIG5 . An annular groove is formed on the side of the second stepped surface 113 of the mounting barrel 11 away from the light outlet 111. The groove wall of the annular groove facing the light outlet 111 forms a first stepped surface 112.

[0066] The second lens 13 includes a second lens portion and a second support body 133 connected to a peripheral side of the second lens portion. The second support body 133 is supported between the first lens 12 and the second stepped surface 113 .

[0067] Among them, the first support body 123 is arranged on the light-emitting side of the first lens portion, and the second support body 133 is arranged on the light-incident side of the second lens portion. The second support body 133 is pressed tightly between the second step surface 113 and the first support body 123, so that a certain space can be created between the first lens portion and the second lens portion.

[0068] As shown in FIG1 , this embodiment further provides a lighting device, comprising a housing 200, a light source 300, and any of the above-described light-mixing lens assemblies 100. The light source 300 is provided with lamp beads of at least two colors. The light source 300 and the light-mixing lens assembly 100 are disposed within the housing 200, with the light-mixing lens assembly 100 located on the light-emitting side of the light source 300.

[0069] Specifically, as shown in Figure 7, the light source 300 includes a mounting base 31 and a light source board 32. The light source board 32 is provided with a plurality of lamp beads 321 of different colors. The light source board 32 is fixedly connected to the mounting base 31 by screws, and the mounting base 31 is fixedly connected to the housing 200.

[0070] Optionally, the light source 300 is a CSP light source, that is, the lamp bead 321 adopts a CSP chip packaging form. Optionally, the inner wall surface of the installation tube 11 is provided with a light shielding layer.

[0071] Furthermore, the light source 300 is fixedly connected to the housing 200 , and the mounting tube 11 is threadedly connected to the housing 200 , so that the light mixing lens assembly 100 can be moved closer to or farther away from the light source 300 .

[0072] The housing 200 is a cylindrical structure with internal threads on its inner wall. The outer wall of the mounting tube 11 is provided with matching external threads, thereby threading the mounting tube 11 into the inner wall of the housing 200. During use, the distance between the mounting tube 11 and the light source 300 can be adjusted by turning the knob on the mounting tube 11, thereby achieving optical focusing and thus adjusting the angle of the light emitted by the lighting device, that is, adjusting the size of the light spot.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this embodiment, rather than to limit it. Although this embodiment has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this embodiment.

Claims

1. A mixed-light lens assembly, comprising: A mounting cylinder provided with a light outlet; A first lens and a second lens, arranged in the mounting cylinder and distributed along the axial direction of the mounting cylinder, with the second lens located between the first lens and the light outlet; Wherein, the first lens is a convex lens and there are a plurality of first microstructures on its incident light surface or emergent light surface, forming a first microstructure surface for initially mixing incident light; there are a plurality of second microstructures on the incident light surface or emergent light surface of the second lens, forming a second microstructure surface for secondarily mixing incident light.

2. The mixed-light lens assembly according to claim 1, further comprising: A mixed-light film, which is arranged in the mounting cylinder and located between the second lens and the light outlet.

3. The mixed light lens assembly according to claim 1, wherein, The second lens is provided with a first region and a second region. The first region is located at the center of the incident light surface or emergent light surface of the second lens, and the second region surrounds the first region. The second microstructures are arranged in the first region.

4. The mixed light lens assembly according to claim 1, wherein, The projection of each one or more adjacent first microstructures towards the light outlet and the projection of any one or more adjacent second microstructures towards the light outlet have at most partial overlap.

5. The mixed light lens assembly according to claim 1, wherein, The plurality of first microstructures are adjacent to each other and arranged in a petal grid pattern.

6. The hybrid light lens assembly according to claim 5, wherein, The petal grid is formed by the intersection of multiple Fibonacci spiral lines.

7. The hybrid light lens assembly according to any one of claims 1-6, wherein, The plurality of second microstructures are adjacent to each other and arranged in multiple layers of circles outward from the center of the second microstructure surface.

8. The hybrid light lens assembly according to any one of claims 1-6, wherein, At least one of the first microstructures and the second microstructures is a bead surface particle.

9. The hybrid light lens assembly according to any one of claims 2-6, wherein, The inner wall surface of the mounting cylinder is provided with a first step surface and a second step surface. The first step surface faces the light outlet, and the second step surface faces away from the light outlet; The first lens includes a first lens portion and a plurality of hooks connected to the first lens portion. The first lens is clamped to the first step surface through the plurality of hooks, and the second lens and the mixed-light film are abutted between the second step surface and the first lens.

10. A lighting device, comprising a housing, a light source, and the mixed-light lens assembly according to any one of claims 1-9. The light source is provided with lamp beads of at least two colors. The light source and the mixed-light lens assembly are arranged in the housing, and the mixed-light lens assembly is located on the light-emitting side of the light source.

11. The lighting device according to claim 10, wherein, The light source is fixedly connected to the housing, and the mounting cylinder is threadedly connected to the housing, so that the mixed-light lens assembly can be close to or away from the light source.

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