Light distribution module, light source module and lamp

Abstract

The invention provides a light distribution module, a light source module and a lamp, the light distribution module comprises a substrate and at least three lenses arranged on the substrate, the at least three lenses comprise a first lens, a second lens and a third lens, and the at least three lenses are all convolution lenses and cover light emitting units with different light colors respectively; the diameters of the first lens, the second lens and the third lens are different, and the diameters of the at least three lenses are related to the light color of the light-emitting unit covered by the at least three lenses. According to the light distribution module provided by the invention, in order to meet the requirement that light spots and angles emitted by lamp beads of all spectrums are the same and all the whole light spots and single light spots can meet the uniformity requirement of an area light source, the lenses covering the light distribution module are designed according to different spectrums respectively, and then integrated combination is adopted, so that one module is formed. Therefore, uniform surface brightness during mixing of colors can be met, and uniform surface brightness during single-color spectrums can also be met.

Description

Technical Field

[0001] 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 a lamp. Background Art

[0002] In the field of lighting, LED light sources have gradually replaced traditional light sources as an energy-saving light source. White light is required for lighting sources. In LED light sources, white light is usually formed by mixing RGB three-color lamp beads. LED lamp beads are usually equipped with lenses for light distribution. For lenses of the same material, the refractive index of light of different wavelengths is different. Due to the different wavelengths of RGB three-color lamp beads, if the same light distribution device is used, the light spot size will be different and the emission angle will be different. In the mixed light module, some of them will also light up one of the colors to form atmosphere lighting. Since the light source arrangement in the surface light source lamp is usually designed according to the overall light spot after mixing, and according to the different refractive indices of each color light, the light spot of monochromatic light and white light are different in size, the overall luminous uniformity of the lamp will be affected, and the surface light source will be uneven. RGB can also form colored light by mixing light. At this time, one color is usually dominant, which will also affect the uniformity of light output to a certain extent. Summary of the invention

[0003] The purpose of the present invention is to solve the above situation. The present application provides a light distribution module, a light source module and a lamp that can distribute light for lamp beads of different colors respectively.

[0004] In order to solve the above-mentioned problem, the technical solution adopted by the present invention is to provide a light distribution module, characterized in that 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, and the diameters of the at least three lenses are related to the light colors of the light-emitting units covered by them.

[0005] 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.

[0006] Furthermore, 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.

[0007] Furthermore, the light distribution module also includes a fourth lens, which is a convolute lens, and 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.

[0008] 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.

[0009] 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.

[0010] The present application also provides a light source module, characterized in that 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 covered by them.

[0011] 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.

[0012] Furthermore, 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.

[0013] Furthermore, 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.

[0014] 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 the fourth lens, at least one of the at least three lenses has a diameter greater than the diameter of the fourth lens, and at least another has a diameter smaller than the diameter of the fourth lens.

[0015] 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.

[0016] 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.

[0017] The present application also provides a lamp, characterized in that the lamp comprises a light source module as described in any one of claims 7-13.

[0018] In order to ensure that the light spot and angle of each spectrum of the lamp beads are the same, so that both the overall light spot and the single light spot can meet the uniformity requirements of the surface light source, the light distribution module provided by the present application is designed according to different spectra, and then the lenses covering it are integrated to form a module. This can not only meet the uniform surface brightness when the colors are mixed, but also meet the uniform surface brightness when each monochromatic spectrum is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a light distribution module according to a preferred embodiment of the present invention; Figure 2 is a cross-sectional view of a light distribution module according to a preferred embodiment of the present invention; Figure 3 This is the relationship between the wavelength and refractive index of PC material; Figure 4 is a light path diagram of a lens in a preferred embodiment of the present invention; Figure 5 is a comparison diagram of the diameters of various lenses in a preferred embodiment of the present invention; Figure 6 is a front view of a light distribution module according to a preferred embodiment of the present invention; Figure 7 It is a structural schematic diagram of a light source module of a preferred embodiment of the present invention; Figure 8 It is a schematic diagram of the arrangement structure of multiple light source modules in a preferred embodiment of the present invention. Implementation

[0020] The light distribution module, optical system and lamp proposed in the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] The structure of the light source module of a preferred embodiment of the present application is as follows Figure 7As shown, it includes a light source board 6 and four light-emitting units arranged on the light source board, 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 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, respectively.

[0022] In this embodiment, RLBW four-color light mixing is adopted, 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 emitting surface 5052. Figure 4 The cross section is obtained by rotating it around an axis.

[0023] The refractive index of different frequency colors of light in the same medium is different. The lens in this embodiment is made of PC material. Figure 3 The relationship between the refractive index of different wavelengths in PC materials is shown. Figure 3 It can be seen 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, which means that the longer the wavelength, the smaller the refractive index. Therefore, it is necessary to design corresponding optical lenses according to each spectrum. Of course, the spectrum of white light is the full spectrum of 380nm~780nm, so for white light we calculate according to the wavelength of 555nm.

[0024] refer to Figure 4 , according to the refractive index theorem: n1*sinθ1=n2*sinθ2 and n2*sinθ3=n3*sinθ4; Where n1=n3=1, n2 is the refractive index of different spectra.

[0025] 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 according to the angle between the incident light of the light source and the normal of the incident surface. The curved surface shape of the light incident surface can be obtained by rotating any free curve or quadratic curve (such as a parabola, an ellipse or a 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 according to the incident light and the normal, and then according to n1*sinθ1=n2*sinθ2, θ2=arcsin(n2*sinθ2 / sinθ1) can be obtained. 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 obtained to obtain θ3. The outgoing light ray θ4 is the desired outgoing angle, which is set according to our needs. It is known that n2, θ3, n3 and θ4 can be used to calculate the normal slope of the light-emitting surface 5052 according to the vector form of the law of refraction. According to the perpendicular relationship between the normal and the tangent, the slope of the tangent can be obtained, thereby obtaining the light-emitting surface curve.

[0026] In this embodiment, the light incident surface 5051 of each lens is the same, 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 size of the lens light exit surface, so the lens sizes corresponding to different wavelengths are different. Figure 5 As shown, 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 the 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.

[0027] 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 adopts a single lens mode, and each lens is fixedly installed with the light source board 6. In this way, the installation of the light-emitting unit on the light source board 6 will be more free, and will not cause the lens and the light-emitting unit to be mismatched. The integrated lens installation is more convenient, and the light source module can be assembled in one step, and better insulation protection can be provided for the light source module, but the relative positions of the light-emitting units of various colors need to be designed in advance, and it is more difficult to modify the design later.

[0028] Light distribution module 5 Figure 1 , Figure 2 , Figure 6 As shown, the integrated structure includes a substrate 508, and the first lens 501, the second lens 502, the third lens 503, and the fourth lens 504 are arranged on the same side of the substrate 508. The fourth lens 504 is arranged in the middle, and the remaining three lenses are arranged around the fourth lens 504. Figure 5 As shown, the centers of the first lens 501, the second lens 502, and the third lens 503 are evenly distributed, that is, equiangularly distributed on a circumferential surface coaxial with the fourth lens.

[0029] In other preferred embodiments, the light source module may also be RGB mixed light, and does not need to include a white light LED. Then the first light-emitting unit 100 emits blue light with a peak wavelength of 430-480nm, the second light-emitting unit 200 emits green light or yellow light with a peak wavelength of 490-580nm, and the third light-emitting unit 300 emits orange light or red light with a peak wavelength of 590-700nm. 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 still select a color in the middle, and the rest of the light colors surround it. This application does not limit this.

[0030] The light source module in this embodiment can be used for various lamps such as ceiling lamps, chandeliers, wall lamps, etc. When it is applied to a surface light source module, a preferred arrangement is as follows: Figure 8 As shown, multiple light source modules in the lamp are arranged in a rotational manner along the center of the lamp. At the same time, each light source module can also rotate around its own center in sequence, that is, two adjacent light source modules on the circumference rotate at an angle to each other, so that the surface brightness of the lamp can be uniform when the colors are mixed, and the surface brightness of the lamp can also be uniform when the monochromatic spectrum is used.

[0031] The above description of the preferred embodiments of the present application is for illustration and description, and is not intended to be exhaustive or limited to the specific form disclosed. Obviously, many modifications and changes may be made, which may be obvious to those skilled in the art and should be included in the scope of the present application defined by the attached claims.

Claims

1. A light distribution module, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, It is characterized in that 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, Features The lamp comprises a light source module as described in any one of claims 7-13.

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