Double-layer light mixing reflector
Through the design of the double-layer mixed light reflector, the first reflective surface and the second reflective surface are used for light distribution and cross-light filling respectively, which solves the problem of uneven spot color of RGB light source lamps when mixing light at small angles, and achieves high efficiency. , uniform small angle light spot.
Patent Information
- Application Number
- CN202411522283.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-01-21
AI Technical Summary
When existing RGB light source lamps mix light at small angles, the color of the spot is difficult to be uniform, resulting in a situation where high light efficiency, small angles and even light mixing cannot be obtained.
It adopts a double-layer mixed light reflector. The first reflective surface uses three semi-ellipsoid reflective cups for light distribution and monochromatic light mixing. The second reflective surface uses a reflection ring table for cross-fill light, eliminating color separation at the edge of the light spot and improving the light spot. Uniformity.
The uniformity of small angles and monochrome light spots is achieved, the edge color of the light spots is eliminated, and the overall light effect is improved.
Smart Images
Figure CN119333777A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of lighting technology, and in particular to a double-layer light-mixing reflector. Background Art
[0002] Since lamps using RGB light sources can mix different colors of light to create an atmosphere, and can also mix white light of different color temperatures for lighting, they are becoming more and more popular in the market.
[0003] Since RGB is a three-color light source, a light mixing structure is required for light mixing. Currently, there are three main types of light mixing used in lighting fixtures. The first is to mix and distribute light through a TIR lens. This method integrates light mixing and light distribution, and is also highly efficient. However, it mainly relies on a pearl surface or a frosted surface for light mixing, so the general light distribution angle is large. When mixing light at a small angle, the color of the lighter peripheral light spot is stratified, and the more serious central light spot cannot be mixed evenly. The second is to mix light through a reflector cup + a diffusion film or a diffusion plate. This method is also highly efficient, but it also faces the same problem as TIR mixing. The color of the small-angle mixed light spot will be stratified. The third is a solution of a mixing cavity + a light distribution lens. The light source first mixes the RGB light together through the mixing cavity, and then distributes the light through a light distribution lens to reduce the light output angle. However, the light efficiency of this solution is very low, and the light will lose a lot of energy when passing through the mixing cavity. In summary, the current lamps using RGB light sources face a situation where high light efficiency, small angle, and uniform light mixing cannot be achieved at the same time. Summary of the invention
[0004] In view of the problems of the prior art, the present invention provides a double-layer mixed light reflector with a novel structure and ingenious design. The first reflective surface of the reflective cup performs light distribution and monochromatic light mixing to obtain small-angle and monochromatic light spot uniformity. The second reflective surface cross-fills the large-angle light directly emitted by the monochromatic RGB light source again to eliminate the color separation of the light spot edge and further improve the overall light spot uniformity, which is beneficial to improving the overall lighting effect of the present invention.
[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a double-layer light-mixing reflector, which comprises a shell and a first-layer reflection component and a second-layer reflection component which are sequentially arranged on the shell; the first-layer reflection component comprises three reflection cups, the inner wall of which is provided with a first reflection surface, the reflection cup is in a semi-ellipsoidal shape, and the three reflection cups are distributed in a triangular shape, one end of the reflection cup is provided with a light inlet, and the other end of the reflection cup is provided with a light outlet, a monochromatic RGB light source is installed at the light inlet of each reflection cup, and the first reflection surface is used for light distribution and light mixing of the light emitted by the monochromatic RGB light source; the second-layer reflection component comprises a reflection ring platform, the inner wall of which is provided with a second reflection surface, the light emitted by the light source is incident from the light inlet to the first reflection surface and is incident from the light outlet to the second reflection surface for outward reflection, and the second reflection surface performs cross-filling of the large-angle light directly emitted by the monochromatic RGB light source.
[0006] The first reflecting surface is defined by the following ellipsoid equation: ; in, , .
[0007] Wherein, the second reflection surface is formed by rotating the reference generatrix around the center of the shell.
[0008] The reference busbar includes a QT segment optical surface and a PQ segment structural surface, and the QT segment optical surface is connected to the first layer of reflective components through the PQ segment structural surface.
[0009] The QT segment uses point T as the starting point for optical surface calculation. , where D1 is the optical aperture of the shell, D is the optical aperture of the reflector cup, and d is the wall thickness of the reflector cup, and the position of point T is determined by this; Connect the center point of the light entrance and the T point to determine the angle , connect the center point of the light entrance and the O point of the light exit of the reflector cup to determine the angle , angle Angle The angle between , divide the angle into n parts, The unit vector of the incident ray is ,in is an integer, ; The L1 area is also divided into n parts, then The unit vector of the outgoing ray is , then according to the vector formula of the law of reflection: It can be calculated that Normal vector of a ray , record the first The coordinates of the points are , then Points and There is the following recursive relationship:
[0010]
[0011] in is an integer, .
[0012] Beneficial effects of the present invention: The present invention has a novel structure and an ingenious design. The light emitted by the monochromatic RGB light source first passes through the first reflecting surface of the reflecting cup for light distribution and monochromatic mixing to obtain a small-angle and monochromatic light spot with good uniformity. Then, the light is emitted from the light outlet through the second reflecting surface. The second reflecting surface cross-fills the large-angle light directly emitted by the monochromatic RGB light source again to eliminate the color separation of the light spot edge and further improve the overall light spot uniformity. Under the above setting, it is beneficial to improve the overall lighting effect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic structural diagram of a double-layer light mixing reflector of the present invention.
[0014] Figure 2 This is a schematic structural diagram of a double-layer light-mixing reflector of the present invention from another viewing angle.
[0015] Figure 3 The figure is a schematic diagram of light rays when a double-layer light-mixing reflector of the present invention is in operation.
[0016] Figure 4 Schematic diagram of the positional relationship among L1, D1, D, d and L2 of the present invention.
[0017] exist Figures 1 to 4 Reference numerals in the drawings include: 100. Shell; 1. First reflection surface; 2. Light inlet; 3. Light outlet; 4. Monochromatic RGB light source; 5. Reflection ring; 6. Second reflection surface; 7. Reflection cup. DETAILED DESCRIPTION
[0018] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the embodiments are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.
[0019] In the present application embodiment, Figures 1 to 3A double-layer light-mixing reflector is shown, which includes a shell 100 and a first-layer reflection component and a second-layer reflection component sequentially arranged on the shell 100; the first-layer reflection component includes three reflection cups 7, the inner wall of the reflection cup 7 is provided with a first reflection surface 1, the reflection cup 7 is semi-ellipsoidal, and the three reflection cups 7 are distributed in a triangular shape. Preferably, the three reflection cups 7 are distributed in an equilateral triangle shape, one end of the reflection cup 7 is provided with a light inlet 2, and the other end of the reflection cup 7 is provided with a light outlet 3. A monochromatic RGB light source 4 is installed at the light inlet 2 of each reflection cup 7, and the first reflection surface 1 is used to distribute and mix the light emitted by the monochromatic RGB light source 4; the second-layer reflection component includes a reflection ring platform 5, the inner wall of the reflection ring platform 5 is provided with a second reflection surface 6, the light emitted by the light source is incident from the light inlet 2 to the first reflection surface 1 and is emitted from the light outlet 3 to the second reflection surface 6 for outward reflection, and the second reflection surface 6 cross-fills the large-angle light directly emitted by the monochromatic RGB light source 4. Specifically, the embodiment of the present application has a novel structure and ingenious design. The light source of the embodiment of the present application is composed of three separate R, G, and B light sources. The three reflective cups 7 are distributed in the shape of an equilateral triangle, and the three monochromatic RGB light sources 4 are distributed in the shape of an equilateral triangle. The centers of the three monochromatic RGB light sources 4 coincide with the vertices of the equilateral triangle. The light emitted by the monochromatic RGB light source 4 first passes through the first reflective surface 1 of the reflective cup 7 for light distribution and monochromatic mixing to obtain a small-angle and monochromatic light spot with better uniformity, and then is emitted from the light outlet 3 through the second reflective surface 6. The second reflective surface 6 cross-fills the large-angle light directly emitted by the monochromatic RGB light source 4 again to eliminate the color separation of the light spot edge and further improve the overall light spot uniformity. Under the above setting, it is beneficial to improve the overall lighting effect of the present invention.
[0020] In the embodiment of the present application, the centers of the three monochromatic RGB light sources coincide with the vertices of an equilateral triangle. The side length L1 of the equilateral triangle is determined by the diameter D of the mouth of the reflector cup (i.e., the diameter of the light outlet). The first layer of reflective components is composed of an array of three identical single reflector cups 7. Since the length of the area where the main light rays from different light sources passing through the reflector cup do not overlap is also L1, in order to make the main light rays overlap as much as possible, L1 should be as small as possible. And because L1=D+d, where d is the thickness of the cup, the diameter of the mouth of the reflector cup should be as small as possible while ensuring the light output angle and the light spot; finally, the first reflection surface is set by the following ellipsoid equation: ; in, , ; is a point on the ellipsoid, c represents the curvature of the surface, , k represents the surface shape of the surface.
[0021] The second layer of reflective components: The surface of the second layer of reflective components is a free-form surface, and its main function is to deflect the large-angle light directly emitted by the light source to the position where the main light emitted by the light sources of different colors through the reflective cup is not superimposed: Since the light sources are spaced apart in space, the edge color of the light source at a certain distance will be deviated after the light is distributed by the reflective cup, that is, the edge color of the light spot is more inclined to the light source arranged on the side close to it; and this part of energy is composed of two parts, one part is the energy emitted by the reflective cup, and the other part is the energy directly emitted from the light source; because it is a small-angle light distribution, the height of the reflective cup is generally limited by the structure, so the large-angle light is the main light of the direct light from the light source; in order to eliminate the color cast phenomenon, it is possible to consider making a layer of reflective cups on the outside to cross-fill the direct light from the light source, such as Figure 3 As shown, the large-angle direct light of R is reflected through the second layer of reflective cups to the area where the main light emitted by the G light source through the reflective cups is not superimposed, while the large-angle direct light of G is reflected through the second layer of reflective cups to the area where the main light emitted by the R light source through the reflective cups is not superimposed.
[0022] In the embodiment of the present application, the second reflective surface is formed by rotating the reference busbar around the center of the shell, and the second reflective surface includes a QT segment optical surface and a PQ segment structural surface, and the QT segment optical surface is connected to the first layer of reflective components through the PQ segment structural surface. Wherein, the reference busbar includes a QT segment and a PQ segment; wherein, the QT segment optical surface is a free-form surface, and its main function is to deflect the large-angle light directly emitted by the monochromatic RGB light source to the position where the main light emitted by the light source of different colors through the reflective cup is not superimposed: due to the distance between the light sources in space, the edge color of the light source at a certain distance will be deviated after the light is distributed by the reflective cup, that is, the edge color of the light spot is more biased towards the light source arranged close to it. Wherein, the positional relationship between L2 and D1, d, and D is as follows Figure 4 As shown, the QT segment uses point T as the starting point for optical surface calculation. , where D1 is the optical aperture of the shell, D is the optical aperture of the reflector cup, d is the wall thickness of the reflector cup, and h is determined by the required structural (shell) height of the lamp, thereby determining the position of point T; Connect the center point of the light entrance and the T point to determine the angle , connect the center point of the light entrance and the O point of the light exit of the reflector cup to determine the angle , angle Angle The angle between , divide the angle into n parts, The unit vector of the incident ray is ,in is an integer, ; The L1 area is divided into n parts in turn, and L1 is defined as the distance between the two RGB light sources, such as Figure 4 As shown, L1=D+d; it is numerically equal to the length of the area where the edge main light rays of two light sources of different colors do not overlap after passing through the first layer of reflective cups; then the The unit vector of the outgoing ray is , then according to the vector formula of the law of reflection: It can be calculated that Normal vector of a ray , record the first The coordinates of the points are , then Points and There is the following recursive relationship:
[0023]
[0024] in is an integer, .
[0025] Specifically, under the above settings, all points on the curved surface of the second reflecting surface can be deduced, and finally these points can be fitted to obtain the curve of the QT segment; since the PQ segment is a structural surface, it is only necessary to connect the PQ segments with arcs or straight lines to obtain the entire curve PT, and then the PT segment can be rotated along the center line of the shell to obtain the surface shape of the second reflecting surface.
[0026] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.
Claims
1. A double-layer light-mixing reflector, characterized in that: The invention comprises a shell and a first layer of reflection components and a second layer of reflection components which are sequentially arranged on the shell; the first layer of reflection components comprises three reflection cups, the inner wall of which is provided with a first reflection surface, the reflection cup is in a semi-ellipsoidal shape, and the three reflection cups are distributed in a triangular shape, one end of the reflection cup is provided with a light inlet, and the other end of the reflection cup is provided with a light outlet, a monochromatic RGB light source is installed at the light inlet of each reflection cup, and the first reflection surface is used for light distribution and light mixing of the light emitted by the monochromatic RGB light source; the second layer of reflection components comprises a reflection ring platform, the inner wall of which is provided with a second reflection surface, the light emitted by the light source is incident from the light inlet to the first reflection surface and is incident from the light outlet to the second reflection surface for outward reflection, and the second reflection surface performs cross-filling of the large-angle light directly emitted by the monochromatic RGB light source.
2. A double-layer light-mixing reflector according to claim 1, characterized in that: The first reflecting surface is defined by the following ellipsoid equation: ； Where c represents the curvature of the surface, , k represents the surface type, , .
3. The double-layer light-mixing reflector according to claim 1, characterized in that: The second reflection surface is formed by rotating the reference generatrix around the center of the shell.
4. The double-layer light-mixing reflector according to claim 3, characterized in that: The second emitting surface includes a QT segment optical surface and a PQ segment structural surface, and the QT segment optical surface is connected to the first layer of reflective components through the PQ segment structural surface.
5. The double-layer light-mixing reflector according to claim 4, characterized in that: The reference generatrix includes a QT segment and a PQ segment, wherein the QT segment uses point T as the starting point for optical surface calculation. , where D1 is the optical aperture of the shell, D is the optical aperture of the reflector cup, and d is the wall thickness of the reflector cup, and the position of point T is determined by this; Connect the center point of the light entrance and the T point to determine the angle , connect the center point of the light entrance and the O point of the light exit of the reflector cup to determine the angle , angle Angle The angle between , divide the angle into n parts, The unit vector of the incident ray is ,in is an integer, ; The L1 area is also divided into n parts, then The unit vector of the outgoing ray is , then according to the vector formula of the law of reflection: It can be calculated that Normal vector of a ray , record the first The coordinates of the points are , then Points and There is the following recursive relationship: in is an integer, .