Light distribution module, light source module, and lighting fixture

Abstract

A light distribution module, a light source module, and a lighting fixture. The light distribution module (5) comprises a substrate (508) and at least three lenses disposed on the substrate (508). The at least three lenses comprise a first lens (501), a second lens (502), and a third lens (503). The at least three lenses are all spiral lenses, and respectively cover light-emitting units (100, 200, 300) of different light colors. The first lens (501), the second lens (502), and the third lens (503) have different diameters. The diameters of the at least three lenses are correlated with the light colors of the light-emitting units covered by the at least three lenses. The lenses covering the light-emitting units are each designed according to the different spectrum of each light-emitting unit, thereby ensuring uniform surface brightness when colors are mixed and when each monochromatic spectrum is used.

Description

Light distribution modules, light source modules and lamps

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on November 23, 2023, with application number 202311582077.X, and invention name “Light distribution module, light source module and lamp”, and the Chinese patent application filed with the China Patent Office on November 23, 2023, with application number 202323184251.3, and utility model name “Light distribution module, light source module and lamp”. The entire contents of the applications are incorporated by reference into this application. Technical Field

[0003] The present invention relates to a light distribution module, in particular to a light distribution module for distributing light for a light source in a lamp, as well as a light source module and the lamp. Background Art

[0004] In the lighting sector, LED light sources have gradually replaced traditional light sources as energy-saving alternatives. White light sources are required for lighting, and LED light sources typically create white light by mixing light from RGB (three-color, multi-element, or multi-color) lamp beads. LED lamp beads are typically equipped with lenses for light distribution. Lenses made of the same material have different refractive indices for different wavelengths. Due to the different wavelengths of the RGB lamp beads, using the same light distribution device can result in uneven light spot sizes and angles of emission. In some light mixing modules, a single color is also illuminated to create ambient lighting. The light source arrangement in surface light fixtures is typically designed based on the overall light spot after mixing. However, due to the varying refractive indices of the various colors, the spot sizes of monochromatic light and white light differ. This can affect the overall uniformity of the fixture, resulting in uneven light output. RGB can also create multicolored light through light mixing, but in this case, a single color is usually dominant, which can also affect light uniformity to some extent. Summary of the Invention

[0005] The purpose of this application is to solve the above situation. This application provides a light distribution module, a light source module and a lamp that can distribute light for lamp beads of different colors respectively.

[0006] In order to solve the above-mentioned problem, the technical solution adopted in the present application is to provide a light distribution module, wherein the light distribution module includes a substrate and at least three lenses arranged on the substrate, the at least three lenses include a first lens, a second lens, and a third lens, the first lens, the second lens, and the third lens are convolute lenses, respectively covering light-emitting units with different light colors, the diameters of the first lens, the second lens, and the third lens are all different, and the diameters of the at least three lenses are related to the light colors of the light-emitting units they cover.

[0007] Furthermore, the diameters of the at least three lenses are positively correlated with the wavelengths of the light emitted from the light-emitting units they cover, that is, the longer the wavelength of the light emitted from the light-emitting units, the longer the corresponding lens diameters.

[0008] Furthermore, the at least three lenses have the same structure, and each lens includes a light incident surface and a light exit surface, wherein the light incident surfaces of each lens are the same.

[0009] Furthermore, the light distribution module also includes a fourth lens, which is a convoluted lens. The light-emitting unit covered by the fourth lens emits white light. At least one of the at least three lenses has a diameter larger than that of the fourth lens, and at least another has a diameter smaller than that of the fourth lens.

[0010] Furthermore, the diameter of the first lens is 0.90 to 0.98 times the diameter of the fourth lens; the diameter of the second lens is 0.95 to 1.00 times the diameter of the fourth lens; and the diameter of the third lens is 1.00 to 1.10 times the diameter of the fourth lens.

[0011] Furthermore, the light distribution module is an integrated structural component, the at least three lenses are arranged around the fourth lens, and the centers of the at least three lenses are evenly distributed on a circumferential surface coaxial with the fourth lens.

[0012] The present application also provides a light source module, wherein the light source module includes a light source board and at least three light-emitting units with different light colors arranged on the light source board, and at least three lenses corresponding to the light-emitting units one by one, the light-emitting units include a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit, the at least three lenses include a first lens, a second lens, and a third lens, the first lens, the second lens, and the third lens are convolute lenses, respectively covering the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit, the diameters of the first lens, the second lens, and the third lens are all different, and the diameters of the at least three lenses are related to the light colors of the light-emitting units they cover.

[0013] Furthermore, the diameters of the at least three lenses are positively correlated with the wavelengths of the light emitted from the light-emitting units they cover, that is, the longer the wavelength of the light emitted from the light-emitting units, the longer the corresponding lens diameters.

[0014] Furthermore, the at least three lenses have the same structure, and each lens includes a light incident surface and a light exit surface, wherein the light incident surfaces of each lens are the same.

[0015] Furthermore, the first light-emitting unit emits blue light with a peak wavelength of 430-480 nm, the second light-emitting unit emits green light or yellow light with a peak wavelength of 490-580 nm, and the third light-emitting unit emits orange light or red light with a peak wavelength of 590-700 nm.

[0016] Furthermore, the light source module also includes a fourth light-emitting unit and a fourth lens, the light-emitting unit emits white light, the fourth lens is a convolute lens, and the fourth light-emitting unit covered by it, at least one of the at least three lenses has a diameter larger than the diameter of the fourth lens, and at least another has a diameter smaller than the diameter of the fourth lens.

[0017] Furthermore, the diameter of the first lens is 0.90 to 0.98 times the diameter of the fourth lens; the diameter of the second lens is 0.95 to 1.00 times the diameter of the fourth lens; and the diameter of the third lens is 1.00 to 1.10 times the diameter of the fourth lens.

[0018] Furthermore, the at least three lenses are arranged around the fourth lens, and the centers of the at least three lenses are evenly distributed on a circumferential surface coaxial with the fourth lens.

[0019] The present application also provides a lamp, wherein the lamp includes the light source module as described in any one of claims 7-13. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of a light distribution module according to a preferred embodiment of the present application;

[0021] FIG2 is a cross-sectional view of a light distribution module according to a preferred embodiment of the present application;

[0022] FIG3 is a graph showing the relationship between wavelength and refractive index of PC materials;

[0023] FIG4 is a light path diagram of a lens in a preferred embodiment of the present application;

[0024] FIG5 is a comparison diagram of lens diameters in a preferred embodiment of the present application;

[0025] FIG6 is a front view of a light distribution module according to a preferred embodiment of the present application;

[0026] FIG7 is a schematic structural diagram of a light source module according to a preferred embodiment of the present application;

[0027] FIG8 is a schematic diagram of the arrangement structure of multiple light source modules in a preferred embodiment of the present application. DETAILED DESCRIPTION

[0028] The light distribution module, optical system and lamp proposed in this application are further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The structure of a light source module according to a preferred embodiment of the present application is shown in FIG7 , and includes a light source board 6 and four light-emitting units disposed thereon, namely, a first light-emitting unit 100, a second light-emitting unit 200, a third light-emitting unit 300, and a fourth light-emitting unit 400, and four lenses corresponding to these light-emitting units, namely, a first lens 501, a second lens 502, a third lens 503, and a fourth lens 504. The first lens 501, the second lens 502, the third lens 503, and the fourth lens 504 respectively cover the first light-emitting unit 100, the second light-emitting unit 200, the third light-emitting unit 300, and the fourth light-emitting unit 400.

[0030] In this embodiment, RLBW four-color light mixing is used. The first light-emitting unit 100 emits blue light with a peak wavelength of 450nm, the second light-emitting unit 200 emits yellow light with a peak wavelength of 540nm, the third light-emitting unit 300 emits red light with a peak wavelength of 630nm, and the fourth light-emitting unit 400 emits white light. The first lens 501, the second lens 502, the third lens 503, and the fourth lens 504 have the same structure, including a light incident surface 5051 and a light exit surface 5052. The cross-section shown in Figure 4 is obtained by rotating it around an axis.

[0031] The refractive index for different frequencies of light in the same medium is different. The lens in this embodiment uses PC material. Figure 3 shows the relationship between the refractive index of different wavelengths in PC material. Figure 3 shows that the refractive index of light with a wavelength of 457.7nm is 1.60567, while the refractive index of light with a wavelength of 629.9nm is 1.58071, indicating that the longer the wavelength, the lower the refractive index. Therefore, it is necessary to design an optical lens specifically for each spectrum. Since the spectrum of white light covers the entire range from 380nm to 780nm, we calculated the wavelength of 555nm for white light.

[0032] Referring to Figure 4, according to the refractive index theorem:

[0033] n1*sinθ1=n2*sinθ2 and n2*sinθ3=n3*sinθ4;

[0034] Where n1=n3=1, n2 is the refractive index of different spectra.

[0035] θ1 is the incident angle formed by the light emitted from the light source on the light incident surface 5051, and θ2 is the exit angle formed by the light emitted from the light incident surface 5051 on the light incident surface 5051. The value of θ1 is determined based on the angle between the incident light of the light source and the normal of the incident surface. The curved shape of the light incident surface can be obtained by rotating any free curve or quadratic curve (such as a parabola, ellipse or circle, etc.). By differentiating the shape of the light incident surface, its tangent equation can be obtained, and thus its normal equation can be obtained. The specific value of θ1 can be obtained based on the incident light and the normal, and then θ2 = arcsin (n2 * sinθ2 / sinθ1) can be obtained based on n1*sinθ1 = n2*sinθ2. Among them, the exit light of the light incident surface 5051 is also the incident light of the light exit surface 5052. According to the geometric relationship, θ3 = f(θ2) can be calculated to obtain θ3. The outgoing light ray θ4 is the desired angle of incidence, which is set according to our needs. Given n2, θ3, n3 and θ4, the normal slope of the light-emitting surface 5052 can be calculated according to the vector form of the law of refraction. Based on the perpendicular relationship between its normal and tangent, the slope of the tangent can be obtained, thereby obtaining the light-emitting surface curve.

[0036] In this embodiment, the light entrance surface 5051 of each lens is identical, and the final light exit angle is required to be the same. According to the above calculation, the larger the refractive index, the smaller the lens light exit surface size. Therefore, the lens sizes corresponding to different wavelengths are different. As shown in Figure 5, the diameter d1 of the first lens 501 is less than the diameter d2 of the second lens 502, less than the diameter d4 of the fourth lens 504, and less than the diameter d3 of the third lens 503. Therefore, the size of the third lens 503 covering red light is larger than the size of the first lens 503 covering blue light. Since white light is calculated based on wavelength 555, the size of the fourth lens 504 covering white light is between the third lens 503 and the first lens 501. Specifically, the diameter d1 of the first lens 501 is 0.90 to 0.98 times the diameter d4 of the fourth lens 504 ; the diameter d2 of the second lens 502 is 0.95 to 1.00 times the diameter d4 of the fourth lens 504 ; and the diameter d3 of the third lens 503 is 1.00 to 1.10 times the diameter d4 of the fourth lens 504 .

[0037] In this embodiment, the first lens 501, the second lens 502, the third lens 503, and the fourth lens 504 are integrated into a light distribution module 5. In other preferred embodiments, the light distribution module 5 may not be integrated. For example, the lens may be a single lens, with each lens separately fixed to the light source board 6. This allows for greater freedom in the installation of the light-emitting units on the light source board 6, without causing mismatches between the lenses and the light-emitting units. While integrated lens installation is more convenient, assembling the light source module in one step can be completed, and better insulation protection can be provided for the light source module. However, the relative positions of the various light-emitting units must be pre-designed, making subsequent design changes more difficult.

[0038] As shown in Figures 1, 2, and 6, the light distribution module 5 is an integrated structure including a substrate 508. A first lens 501, a second lens 502, a third lens 503, and a fourth lens 504 are disposed on the same side of the substrate 508. The fourth lens 504 is disposed in the center, and the remaining three lenses are disposed around the fourth lens 504. As shown in Figure 5, the centers of the first lens 501, the second lens 502, and the third lens 503 are evenly distributed, i.e., equiangularly distributed, on a circumferential surface coaxial with the fourth lens.

[0039] In other preferred embodiments, the light source module can also be RGB mixed light, and does not need to include white light LEDs. Then the first light-emitting unit 100 emits blue light with a peak wavelength of 430 to 480 nm, the second light-emitting unit 200 emits green light or yellow light with a peak wavelength of 490 to 580 nm, and the third light-emitting unit 300 emits orange light or red light with a peak wavelength of 590 to 700 nm. We can use the same method to design the lenses. When integrated into a module, the centers of the first lens 501, the second lens 502, and the third lens 503 are located at the three vertices of an equilateral triangle. In other embodiments, in order to improve the color rendering, more colors can be used for light mixing. The design of a single lens is still calculated according to the wavelength. When combined, it is preferred that the white light is located in the center, and the other lenses surround the white light at equal angles. Or one color can still be selected to be in the middle, and the remaining light colors surround it. This application does not limit this.

[0040] The light source module in this embodiment can be used in various lamps such as ceiling lamps, chandeliers, and wall lamps. When applied to a surface light source module, a preferred arrangement is shown in Figure 8 , where multiple light source modules in the lamp are arranged in a rotational pattern around the center of the lamp. Each light source module can also rotate sequentially around its own center, with adjacent light source modules on the circumference rotated at an angle relative to each other. This ensures uniform brightness across the lamp surface when mixing colors, as well as when using monochromatic spectra.

[0041] The above description of the preferred embodiments of the present application is for illustration and description purposes and is not intended to be exhaustive or to limit the present application to the specific forms disclosed. Obviously, many modifications and changes may be made, which may be obvious to those skilled in the art and should be included within the scope of the present application as defined by the appended claims.

Claims

1. A light distribution module, wherein: The light distribution module includes a substrate and at least three lenses arranged on the substrate. The at least three lenses include a first lens, a second lens, and a third lens. The first lens, the second lens, and the third lens are convolute lenses, which respectively cover light-emitting units with different light colors. The diameters of the first lens, the second lens, and the third lens are all different. The diameters of the at least three lenses are related to the light colors of the light-emitting units they cover.

2. The light distribution module according to claim 1, wherein: The diameters of the at least three lenses are positively correlated with the wavelengths of the light emitted by the light-emitting units they cover, that is, the longer the wavelength of the light emitted by the light-emitting units, the longer the corresponding lens diameters.

3. The light distribution module according to claim 2, wherein: The at least three lenses have the same structure, and each lens comprises a light incident surface and a light emitting surface, wherein the light incident surfaces of each lens are the same.

4. The light distribution module according to claim 3, wherein: The light distribution module also includes a fourth lens, which is a convolute lens. The light-emitting unit covered by the fourth lens emits white light. At least one of the at least three lenses has a diameter greater than that of the fourth lens, and at least another has a diameter smaller than that of the fourth lens.

5. The light distribution module according to claim 4, wherein: The diameter of the first lens is 0.90 to 0.98 times the diameter of the fourth lens; the diameter of the second lens is 0.95 to 1.00 times the diameter of the fourth lens; and the diameter of the third lens is 1.00 to 1.10 times the diameter of the fourth lens.

6. The light distribution module according to claim 5, wherein: The light distribution module is an integrated structural component, the at least three lenses are arranged around the fourth lens, and the centers of the at least three lenses are evenly distributed on a circumferential surface coaxial with the fourth lens.

7. A light source module, wherein: The light source module includes a light source board and at least three light emitting units with different light colors arranged on the light source board, and at least three lenses corresponding to the light emitting units one by one, the light emitting units include a first light emitting unit, a second light emitting unit, and a third light emitting unit, the at least three lenses include a first lens, a second lens, and a third lens, the first lens, the second lens, and the third lens are convolute lenses, respectively covering the first light emitting unit, the second light emitting unit, and the third light emitting unit, the diameters of the first lens, the second lens, and the third lens are all different, and the diameters of the at least three lenses are related to the light colors of the light emitting units they cover.

8. The light source module according to claim 7, wherein: The diameters of the at least three lenses are positively correlated with the wavelengths of the light emitted by the light-emitting units they cover, that is, the longer the wavelength of the light emitted by the light-emitting units, the longer the corresponding lens diameters.

9. The light source module according to claim 8, wherein: The at least three lenses have the same structure, and each lens comprises a light incident surface and a light emitting surface, wherein the light incident surfaces of each lens are the same.

10. The light source module according to claim 9, wherein: The first light emitting unit emits blue light with a peak wavelength of 430-480nm, the second light emitting unit emits green light or yellow light with a peak wavelength of 490-580nm, and the third light emitting unit emits orange light or red light with a peak wavelength of 590-700nm.

11. The light source module according to claim 10, wherein: The light source module also includes a fourth light-emitting unit and a fourth lens. The light-emitting unit emits white light. The fourth lens is a convolute lens that covers the fourth light-emitting unit. Among the at least three lenses, at least one has a diameter greater than that of the fourth lens, and at least another has a diameter less than that of the fourth lens.

12. The light source module according to claim 11, wherein: The diameter of the first lens is 0.90 to 0.98 times the diameter of the fourth lens; the diameter of the second lens is 0.95 to 1.00 times the diameter of the fourth lens; and the diameter of the third lens is 1.00 to 1.10 times the diameter of the fourth lens.

13. The light source module according to claim 12, wherein: The at least three lenses are arranged around the fourth lens, and the centers of the at least three lenses are evenly distributed on a circumferential surface coaxial with the fourth lens.

14. A lamp, wherein: The lamp comprises a light source module as described in any one of claims 7-13.

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