Light distribution module, optical system and luminaire

Abstract

This application provides a light distribution module, an optical system, and a luminaire. The light distribution module, used for distributing light from a light source, includes a lens. The lens comprises an incident light surface, a reflecting light surface, and an emitting light surface arranged sequentially. A through-structure is formed in the middle of the lens, extending from the incident light surface to the emitting light surface. A reflecting portion is disposed within the through-structure. The reflecting portion includes an incident light port and an emitting light port arranged opposite each other, and a sidewall connecting the incident light port and the emitting light port. The incident light port is disposed on the incident light surface, and the emitting light port is disposed on the emitting light surface. The sidewall covers the inner surface of the through-structure. By placing the reflecting portion at the center of the lens, Fresnel reflection that may occur on the incident light surface of the lens is eliminated, thereby solving the problems of secondary light spots and glare.

Description

Technical Field

[0001] This invention relates to a light distribution module, particularly a light distribution module for distributing light to a light source in a luminaire, as well as an optical system and luminaire including the light distribution module. Background Technology

[0002] In the lighting field, LED light sources, as an energy-saving light source, have gradually replaced traditional light sources. Currently, the application of LED light sources is widespread, and the market's requirements for LED light source modules in terms of luminous efficacy, heat dissipation, and weather resistance are constantly increasing. Because LED chips have a relatively small emission angle, they typically require optical components such as lenses for light distribution when used as light sources. When using lenses to distribute the light from LED light sources, the light emitted by the light source undergoes Fresnel reflection at the lens's incident surface, thus forming a secondary light spot in the central part, causing glare. Summary of the Invention

[0003] The purpose of this invention is to solve the problems of secondary light spots and glare in existing lenses.

[0004] To solve the above problems, the present invention provides a light distribution module for distributing light from a light source. The light distribution module includes a lens, which comprises a light-incident surface, a reflective surface, and a light-exiting surface arranged sequentially. A through-structure extending from the light-incident surface to the light-exiting surface is formed in the middle of the lens. A reflective portion is disposed within the through-structure. The reflective portion includes a light-incident port and a light-exit port arranged opposite each other, and a sidewall connecting the light-incident port and the light-exit port. The light-incident port is disposed on the light-incident surface, the light-exit port is disposed on the light-exiting surface, and the sidewall covers the inner surface of the through-structure.

[0005] Furthermore, the reflective part is a prism reflector, and the outer side of the sidewall of the prism reflector is provided with a plurality of arrayed convex ridge structures extending from the light inlet to the light outlet.

[0006] Furthermore, the through structure has a recessed platform at one end near the light-emitting surface, and the prism reflector has a protruding edge on the outer side of one end of the light-emitting port, the protruding edge and the recessed platform being fitted together.

[0007] Furthermore, the protruding edge and the recessed platform are fixedly connected by ultrasonic welding.

[0008] Furthermore, the reflection is a reflective layer disposed on the inner surface of the through structure.

[0009] Furthermore, the reflective part and the lens are rotary structures, with the reflective part nested within the through structure.

[0010] Furthermore, the reflective part is a gyro with a parabolic generatrix.

[0011] Furthermore, the light-incident surface of the lens is an inclined plane, and the angle α between the light-incident surface and the mounting plane of the lens is ≥30°.

[0012] Furthermore, the angle α between the light-incident surface and the mounting plane of the lens is ≥45°.

[0013] Furthermore, the light distribution module also includes a microprism sheet 3, which is disposed adjacent to the light outlet and the light emitting surface. At least a portion of the surface area of ​​the microprism sheet is provided with a microprism structure, and the area where the microprism structure is disposed covers the light outlet and / or the light emitting surface.

[0014] Furthermore, the light distribution module also includes a secondary reflector, which is disposed on the side of the microprism sheet opposite to the lens.

[0015] This application also provides an optical system, characterized in that it includes a light source and a light distribution module as described above. The light source is disposed on the light entrance side of the reflector and emits light facing the light entrance surface of the lens and the light entrance of the reflector. The small-angle light emitted by the light source is distributed by the reflector, and the large-angle light emitted by the light source is distributed by the lens.

[0016] This application also provides a lamp, characterized in that: the lamp includes a lamp housing and an optical system as described above, the optical system being disposed within the lamp housing.

[0017] Furthermore, the lamp is a spotlight.

[0018] The light distribution module provided by this invention features a reflective element at the center of the lens, eliminating Fresnel reflections that may occur on the lens's incident surface. Simultaneously, increasing the angle between the lens's incident surface and the lens mounting plane reduces the angle of incidence, thus minimizing Fresnel reflections. This results in significantly reduced Fresnel reflections across the entire light distribution module, thereby resolving issues of secondary light spots and glare. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a preferred embodiment of the light distribution module of the present invention;

[0020] Figure 2 This is a cross-sectional view of a preferred embodiment of the light distribution module of the present invention;

[0021] Figure 3 yes Figure 1 A structural diagram of the reflector in a preferred embodiment;

[0022] Figure 4 This is a cross-sectional view of a light distribution module according to another preferred embodiment of the present invention;

[0023] Figure 5 This is an optical path diagram of an optical system according to a preferred embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of a lamp according to a preferred embodiment of the present invention. Detailed Implementation

[0025] The light distribution module, optical system, and luminaire proposed in this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The structure of the light distribution module of a preferred embodiment of this application is as follows: Figure 1 , Figure 2 As shown, the lens includes a lens 1 and a reflecting part 2. The outer contour of the lens 1 is that of a conventional TIR lens, including an incident surface 101, a reflecting surface 103, and an exiting surface 102 arranged sequentially. Light rays enter through the incident surface 101, are reflected by the reflecting surface 103, and exit through the exiting surface 102. Generally, the incident surface 101, the reflecting surface 103, and the exiting surface 102 are connected in sequence. In some cases, there may also be some non-optical surfaces in between, such as a mounting surface between the incident surface 101 and the reflecting surface 103 for mounting and fixing the lens 1. This application does not limit this.

[0027] A through structure 205 is formed in the middle of lens 1, extending from the light-incident surface 101 to the light-outceasing surface 102, and a reflecting part 2 is disposed within the through structure 205. In this embodiment, the reflecting part 2 is a prism reflector, such as... Figure 3 As shown, the reflector 2 includes an entrance port 201 and an exit port 202 disposed opposite to each other, and a sidewall 203 connecting the entrance port 201 and the exit port 202. The outer surface of the sidewall 203 is provided with an array of convex prism structures 206 extending from the entrance port 201 to the exit port 202. The reflector 2 is installed after the through-structure 205 of the lens 1. The entrance port 201 is located on the entrance surface 101, and the exit port 202 is located on the exit surface 102. The sidewall 203, which has a prism array, covers the inner surface of the through-structure 205. In a TIR lens, large-angle light entering the lens 1 is reflected by the reflector 103 and then emitted, while small-angle light entering the entrance surface 101 passes directly through the lens and exits from the exit surface 102. With the through-structure 205 located in the middle of the lens 1, this portion of light does not need to undergo two refractions, thus avoiding Fresnel reflection and reducing glare. The reflector 2 is provided in the through structure 205 to distribute the light in the middle part and prevent it from entering the lens from the side and affecting the light output effect.

[0028] In this embodiment, both lens 1 and reflector 2 are gyroscopic structures. The through-hole 205 is a through-hole located in the middle of lens 1, through which reflector 2 is fitted. The generatrix of reflector 2 can be a straight line or a curve. In a preferred embodiment, reflector 2 is a gyroscopic body with a parabolic generatrix. In other preferred embodiments, lens 1 can also be a stretching lens, the through-hole 205 is a strip-shaped slot extending along the stretching direction, and the structure of reflector 2 is the same as that of through-hole 205, with its sidewalls 203 disposed on the two side slot walls, and the convex rib structures 206 arranged in an array along the stretching direction of lens 1.

[0029] To further reduce Fresnel reflection, the incident surface 101 of lens 1 is inclined, and the angle α between the incident surface 101 and the mounting plane of lens 1 is ≥30°. This results in a smaller angle of incidence for the light emitted from light source 6 when entering the incident surface, leading to less Fresnel reflection and reducing the energy reflected from the interface. More preferably, the angle α between the incident surface 101 and the mounting plane of lens 1 is ≥45°; in this embodiment, α=45°.

[0030] In this embodiment, to connect the lens 1 and the reflector 2, the through structure 205 of the lens 1 has a recessed platform 104 at one end near the light-emitting surface 102, and the prism reflector of the reflector 2 has a protruding edge 204 on the outer side of one end of the light-emitting port 202. After the reflector 2 is inserted into the lens 1, the protruding edge 204 and the recessed platform 104 cooperate and are fixedly connected by ultrasonic welding.

[0031] Another preferred embodiment of this application, such as Figure 4 As shown, the structure of lens 1' is similar to that of the previous embodiment, including an incident light surface 101', an exit light surface 102', a reflective surface 103', and a through structure 205' located in the middle. The specific structure will not be described in detail here. The difference from the previous embodiment is that the reflective part 2' is a reflective layer. The reflective layer can be made of reflective paper or metal material and match the shape of the through structure 205'. Alternatively, it can be a reflective coating formed on the inner wall of the through structure 205' through electroplating, spraying, or other methods. The incident light port 201' of the reflective part 2' is the port of the through structure 205' on the side of the incident light surface 101' of lens 1', and the exit light surface 202' is the port of the through structure 205' on the side of the exit light surface 102' of lens 1'. The entire reflective layer serves as the side wall 203' of the reflective part 2', covering the inner surface of the through structure 205'.

[0032] like Figure 1 , Figure 2As shown, the light distribution module also includes microprism sheets 3 on the outer sides of the light outlet 202 of the reflector 2 and the light emitting surface 102 of the lens 1. At least a portion of the surface area of ​​the microprism sheet 3 is provided with a microprism structure 301, and the area with the microprism structure 301 covers at least one of the light outlet 202 and the light emitting surface 102. In this embodiment, the area with the microprism structure 301 simultaneously covers both the light outlet 202 of the reflector 2 and the light emitting surface 102 of the lens 1. The microprism sheet 3 is positioned adjacent to the light outlet 202 and the light emitting surface 102, which can play a role in light mixing and further prevent glare.

[0033] A secondary reflector 4 can be set on the side of the microprism 3 away from the lens 1 for secondary light distribution, thereby controlling the light emission angle.

[0034] The above-mentioned light distribution module, when combined with light source 6, forms a preferred embodiment of the optical system of the optical module of this application, such as... Figure 5 As shown. The light source 6 is disposed on one side of the light inlet 201 of the reflector 2, and emits light facing the light inlet surface 101 of the lens 1 and the light inlet 201 of the reflector. Figure 5 The optical path diagram of the embodiment's optical system is also shown. Large-angle light emitted from the light source 6 is distributed by the lens 1 to control the beam. Small-angle light emitted from the light source 6 is distributed by the reflector 2; most of the light passes directly through the reflector 2, while a small portion of stray light is reflected back to the central region. The lens 1 collects most of the energy because the angle between the incident surface 201 and the lens mounting plane is large, resulting in a small incident angle of the light at the incident surface 201, reducing the energy reflected from the interface. The remaining slight reflected energy is also directly reflected onto the aluminum substrate, and after further reflection, the energy is negligible. Then, a certain amount of light mixing is formed by the microprism 3. A portion of the energy is controlled by the prism reflector as the reflector 2, ensuring a clearer boundary during wall washing. This optical system exhibits minimal Fresnel reflection overall, resolving issues of secondary light spots and glare.

[0035] The optical system in this embodiment can be used as follows: Figure 6 The spotlight shown includes a lamp housing 8, and the aforementioned optical system is disposed within the lamp housing 8. Figure 6 The image shows a microprism 3 and a secondary reflector 4. The lens 1, reflector 2, and light source 6 are disposed within the space formed by the microprism 3 and the lamp housing 8. In other preferred embodiments, the optical system can also be used for downlights, wall washers, linear lights, office chandeliers, etc.

[0036] The description of the preferred embodiments of this application above is for illustrative purposes and is not intended to exhaustively describe or limit the application to the specific forms disclosed. Obviously, many modifications and variations may be made, which may be apparent to those skilled in the art and should be included within the scope of this application as defined by the appended claims.

Claims

1. A light distribution module for distributing light from a light source (6), characterized in that, The light distribution module includes lenses (1, 1'), each lens (1, 1') comprising a light-incident surface (101, 101'), a reflective surface (103, 103'), and a light-exit surface (102, 102') arranged sequentially. A through structure (205, 205') is formed in the middle of each lens (1, 1') from the light-incident surface (101, 101') to the light-exit surface (102, 102'). A reflective portion (2, 2') is disposed within the through structure (205, 205'), and the reflective portion (2, 2') includes a light-incident port (201, 201') and a light-exit port (202, 202') arranged opposite to each other, and a connection to the light-incident port (201, 201'). The light outlets (202, 202') and the sidewalls (203, 203') of the light outlets (202, 202') are provided. The light inlet (201, 201') is disposed on the light inlet surface (101, 101'). The light outlets (202, 202') are disposed on the light outlet surface (102, 102'). The sidewalls (203, 203') cover the inner surface of the through structure (205, 205'). The reflective part (2, 2') is a prism reflector. The outer surface of the sidewalls (203, 203') of the prism reflector is provided with a plurality of arrayed convex rib structures (206) extending from the light inlet (201, 201') to the light outlet (202, 202').

2. The light distribution module according to claim 1, characterized in that, The through structure (205, 205') has a recessed platform (104) at one end near the light-emitting surface, and the prism reflector has a raised edge (204) on the outer side of one end of the light-emitting port. The raised edge (204) and the recessed platform (104) are installed together.

3. The light distribution module according to claim 2, characterized in that, The protruding edge (204) and the recessed platform (104) are fixedly connected by ultrasonic welding.

4. The light distribution module according to any one of claims 1-3, characterized in that, The reflective parts (2, 2') and the lenses (1, 1') are rotary structures, and the reflective parts (2, 2') are sleeved in the through structure (205, 205').

5. The light distribution module according to claim 4, characterized in that, The reflective part (2, 2') is a gyro with a parabolic generatrix.

6. The light distribution module according to any one of claims 1-3, characterized in that, The light-incident surfaces (101, 101') of the lens (1, 1') are inclined surfaces, and the angle α between the light-incident surfaces (101, 101') and the mounting plane of the lens (1, 1') is ≥30°.

7. The light distribution module according to claim 6, characterized in that, The angle α between the light-incident surface (101, 101') and the mounting plane of the lens (1, 1') is ≥45°.

8. The light distribution module according to claim 6, characterized in that, The light distribution module further includes a microprism sheet (3), which is disposed adjacent to the light outlet (202, 202') and the light emitting surface (102, 102'). At least a portion of the surface area of ​​the microprism sheet (3) is provided with a microprism structure (301), and the area of ​​the microprism structure (301) covers the light outlet (202, 202') and / or the light emitting surface (102, 102').

9. The light distribution module according to claim 8, characterized in that, The light distribution module also includes a secondary reflector (4), which is disposed on the side of the microprism sheet (3) away from the lens (1, 1').

10. An optical system, characterized in that, The light source (6) includes a light source (6) and a light distribution module as described in any one of claims 1-9. The light source (6) is disposed on the side of the light inlet (201, 201') of the reflector (2, 2') and emits light facing the light inlet (101, 101') of the lens (1, 1') and the light inlet (201, 201') of the reflector. The small-angle light emitted by the light source (6) is distributed by the reflector (2, 2'), and the large-angle light emitted by the light source (6) is distributed by the lens (1, 1').

11. A lamp, characterized in that: The luminaire includes a luminaire housing (8) and an optical system as described in claim 10, wherein the optical system is disposed within the luminaire housing (8).

12. The lamp according to claim 11, characterized in that, The lamp is a spotlight.

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