A light source module and a manufacturing method thereof

Abstract

The embodiment of the present application relates to the technical field of optical illumination, and discloses a light source module and a manufacturing method thereof, the light source module comprises a light source and an optical film element, the light source is configured to emit illumination light according to an angle perpendicular to the light-out surface of the light source, the optical film element is attached to the light-out surface of the light source, and the optical film element is configured to modulate the illumination light to a preset angle and / or a preset intensity distribution before emitting, wherein the preset angle is an angle not perpendicular to the light-out surface of the light source, and the preset intensity is not the intensity of the illumination light directly emitted by the light source, the light source module provided by the embodiment of the present application has the advantages of miniaturization and simplification, and occupies a smaller volume when applied to a lighting device.

Description

Technical Field

[0001] This invention relates to the field of optical lighting technology, and in particular to a light source module and its manufacturing method. Background Technology

[0002] Light-emitting diode (LED) light sources, also known as LED light sources, have advantages such as small size, long lifespan, and high efficiency, and are therefore widely used in industrial lighting, home lighting, and other fields. Typically, LED light sources have characteristics such as... Figure 1 The radiation characteristics shown indicate that it has a certain divergence angle, but only within... Figure 1 The intensity is greatest in the main direction of 0°, and different lighting effects can be achieved by utilizing this directionality.

[0003] In implementing the embodiments of the present invention, the inventors discovered that the current mainstream solution for achieving angled lighting is a mechanical approach, a common method being as follows: Figure 2 As shown, by rotating the light emission direction of the LED light source, as... Figure 2 One common method is to rotate the light source by an angle θ to adjust the relative spatial angle between the LED light source and the illuminated object. Another common method is to use a reflector to deflect the light angle. Both of these methods require additional mechanical modifications and costs, making them inefficient and costly solutions, especially in space-constrained and compact machine vision equipment. Sometimes, they are even impossible to implement due to spatial limitations. Furthermore, changing the lighting angle introduces an optical path difference, which significantly affects the illumination effect of light sources such as lasers. Summary of the Invention

[0004] This application provides a light source module and its manufacturing method, which can solve the problems of large size and high cost of mechanical methods for changing the illumination angle of the light source.

[0005] The objective of this invention is achieved through the following technical solutions:

[0006] To address the aforementioned technical problems, in a first aspect, an embodiment of the present invention provides a light source module, comprising: a light source configured to emit illumination light at an angle perpendicular to the light-emitting surface of the light source; and an optical thin-film element attached to the light-emitting surface of the light source, wherein the optical thin-film element is configured to modulate the illumination light to a preset angle and / or a preset intensity distribution before emitting it, wherein the preset angle is an angle that meets the lighting requirements, and the preset intensity is an intensity that meets the lighting requirements.

[0007] In some embodiments, the light exit surface of the light source comprises a plurality of sub-regions, the optical film elements attached to the plurality of sub-regions have different film microstructures, the different film microstructures correspond to different sub-regions, and the different film microstructures have different diffraction angles corresponding to the sub-regions.

[0008] In some embodiments, the optical film elements attached to the plurality of sub-regions are configured to modulate the illumination light to be emitted after being modulated to different diffraction angles; and / or, the optical film elements attached to the plurality of sub-regions are configured to modulate the illumination light to be emitted after being modulated to different illuminances, so as to adjust the illuminance distribution of the illumination light output by the light source module.

[0009] In some embodiments, when the light source is an AOI ring light source, the AOI ring light source is provided with a ring-shaped LED array in the diametrical direction, and the ring-shaped LED array is partially or entirely attached with the optical film elements.

[0010] In some embodiments, the ring-shaped LED array comprises a ring-shaped red LED array, a ring-shaped green LED array, and a ring-shaped blue LED array, the surfaces of the ring-shaped red LED array and the ring-shaped blue LED array are attached with the optical film elements, the optical film elements attached to the ring-shaped red LED array and the optical film elements attached to the ring-shaped blue LED array have different film microstructures, the different film microstructures have different diffraction angles, and the light source module is configured to make the light fluxes emitted to the irradiated test board through the AOI ring light source and the optical film elements consistent.

[0011] In some embodiments, when the light source is a planar light source, the planar light source has a certain ratio with the size of the irradiated test board, the surface of the planar light source comprises a first region with a main illumination direction perpendicular to the irradiated test board, and a second region with a main illumination direction not perpendicular to the irradiated test board, the optical film elements attached to the first region and the optical film elements attached to the second region have different film microstructures, the different film microstructures have different diffraction angles, and the light source module is configured to make the light fluxes emitted to the irradiated test board through the planar light source and the optical film elements consistent.

[0012] In some embodiments, the light source further comprises a transparent diffusion plate, the optical film elements are attached to the transparent diffusion plate, and the transparent diffusion plate is fixedly arranged on the light exit side of the light source.

[0013] To solve the above technical problems, in a second aspect, the application provides a manufacturing method of a light source module, the method comprising: obtaining a main lighting direction of a light source and a lighting demand angle; determining whether an included angle between the main lighting direction of the light source and the lighting demand angle exceeds a preset angle threshold; if yes, attaching an optical film element to the light source to obtain the light source module as described in the first aspect.

[0014] In some embodiments, before the optical film element is attached to the light source, the method further comprises: obtaining an angle difference between the main lighting direction of the light source and the lighting demand angle; and obtaining an optical film element that meets the angle difference, wherein the optical film element is configured to modulate the lighting direction of the LED lamp bead of a specified wavelength in the light source to the lighting demand angle.

[0015] In some embodiments, the light source is an LED area light source, the LED area light source comprises a plurality of sub-regions, and when the light ray angles of the plurality of sub-regions of the LED area light source are inconsistent, the method further comprises: obtaining the light ray angle of each of the plurality of sub-regions; and obtaining, according to the light ray angle of each of the plurality of sub-regions, an optical film element that can adjust the light ray angle of each of the plurality of sub-regions to the lighting demand angle.

[0016] Compared with the prior art, the application has the following beneficial effects: different from the prior art, the embodiments of the application provide a light source module and a manufacturing method thereof, the light source module comprising a light source and an optical film element, the light source being configured to emit lighting light at an angle perpendicular to a light emitting surface of the light source, the optical film element being attached to the light emitting surface of the light source, the optical film element being configured to modulate the lighting light to be emitted at a preset angle and / or a preset intensity distribution, wherein the preset angle is an angle that meets lighting demand, and the preset intensity is an intensity that meets lighting demand, the light source module provided by the embodiments of the application has the advantages of miniaturization and simplification, and occupies a smaller volume when applied to a lighting device. BRIEF DESCRIPTION OF DRAWINGS

[0017] The embodiments are exemplarily described by the pictures in the drawings corresponding to the embodiments, and the exemplarily descriptions do not constitute limitations on the embodiments, the elements / modules with the same reference numerals in the drawings represent the similar elements / modules, and the drawings do not constitute proportional limitations unless otherwise specified.

[0018] Figure 1 is a radiation characteristic diagram of an LED light source;

[0019] Figure 2 is a structure diagram of an existing light source;

[0020] Figure 3 is a structural schematic diagram of a light source module provided by an embodiment of the present application;

[0021] Figure 4 is a structural schematic diagram of three light sources in a light source module provided by an embodiment of the present application;

[0022] Figure 5 is a structural diagram of another existing light source;

[0023] Figure 6 is a structural schematic diagram of another light source module provided by an embodiment of the present application;

[0024] Figure 7 is a structural schematic diagram of a light source module when the light source is an AOI ring-shaped light source provided by an embodiment of the present application;

[0025] Figure 8 is a schematic diagram of the light path and the field of view angle of the output light rays of the light source module before and after the film is attached when the light source is an AOI ring-shaped light source provided by an embodiment of the present application;

[0026] Figure 9 is a structural schematic diagram of an existing area light source and a to-be-illuminated test board;

[0027] Figure 10 is a structural schematic diagram of a light source module and a to-be-illuminated test board provided by an embodiment of the present application;

[0028] Figure 11 is Figure 10 a diagram showing the relationship between each point on the to-be-illuminated test board and the uniformity of illumination;

[0029] Figure 12 is a flowchart of a manufacturing method of a light source module provided by an embodiment of the present application;

[0030] Figure 13 is a flowchart of a manufacturing method of another light source module provided by an embodiment of the present application;

[0031] Figure 14 is a flowchart of a manufacturing method of still another light source module provided by an embodiment of the present application. DETAILED DESCRIPTION

[0032] The present application will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made. These all belong to the protection scope of the present application.

[0033] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0034] It should be noted that the various features of the embodiments of the present application can be combined with each other if there is no conflict, and all within the scope of protection of the present application. In addition, although the functional modules are divided in the device schematic diagram, in some cases, the module division in the device can be different.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application. The term "and / or" used in the specification of the present application includes any and all combinations of one or more related listed items.

[0036] In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as there is no conflict.

[0037] In order to solve the problem that the mechanical structure for changing the illumination angle of the light source usually needs to be large in size in the current mechanical scheme for changing the illumination angle of the light source, the embodiments of the present application provide a light source module and a manufacturing method thereof. The light source module changes the illumination angle of the light source by directly attaching an optical film element to the surface of the light source, so that the illumination angle of the light source is changed without changing the original mechanical size, position angle of the light source, or adding a mirror. The light source module has the advantages of miniaturization and simplification, and only needs a small space when applied to a lighting device or the like to realize multi-angle illumination.

[0038] Specifically, the embodiments of the present application will be further described below with reference to the drawings.

[0039] The embodiments of the present application provide a light source module 10, please see Figure 3 which shows the structure of a light source module 10 provided by the embodiments of the present application, wherein the rectangular part is a light source 11 or a part of the light source 11, the arrow represents the main direction of the light beam propagation, and the light source module 10 comprises the light source 11 and an optical film element 12.

[0040] The light source 11 is configured to emit illumination light L1 at an angle perpendicular to the light exit surface of the light source 11. Wherein, from the shape of the light source 11, please see Figure 4 which shows three kinds of light sources provided by the embodiments of the present application, such as Figure 4As shown in the diagram on the left, light source 11 can be an AOI ring light source, which outputs red, green, and blue light through ring-shaped LED beads. Alternatively, as... Figure 4 As shown in the middle or right diagram, light source 11 can also be either a planar light source or an oblique light source.

[0041] Furthermore, regarding the light emission type of the light source 11, the light source 11 can be an LED light source, which is composed of a plurality of light-emitting diode beads evenly arranged. These light-emitting diodes can be white LEDs, or periodically and evenly arranged red, blue, and green LEDs, or monochromatic LEDs. Alternatively, the light source 11 can be a laser surface light source, which is a monochromatic laser light source. Specifically, the light source 11 can use monochromatic light, multicolor light, or white light, which can be selected and set according to actual needs, and is not limited to the limitations of the embodiments of this invention.

[0042] An optical thin-film element 12 is attached to the light-emitting surface of the light source 11. The optical thin-film element 12 is configured to modulate the illumination light L1 to a preset angle α and / or a preset intensity distribution before emission. The preset angle α is the angle that meets the lighting requirements, and the preset intensity is the intensity that meets the lighting requirements. For example, the preset angle α can be an angle not perpendicular to the light-emitting surface of the light source 11, and the preset intensity can be the intensity of illumination light not directly emitted from the light source 11. Figure 3 As shown, the illumination light L1 is adjusted to a beam L2 with a preset angle α to be output. Specifically, the model of the optical thin film element 12 can be selected according to the structural design requirements of the light source module 10 and the required illumination light output angle. Different angles of illumination light output can be achieved by using optical thin film elements 12 with different structures, without being limited to the embodiments of the present invention. Figure 1 The limitation.

[0043] Unlike traditional Figure 2 The mechanical method shown, which achieves illumination at different angles by changing the mechanical angle of the light source, is illustrated in the embodiments of the present invention, such as... Figure 3 As shown, by attaching an optical thin-film element 12 to the light-emitting surface of the light source 11, the illumination angle of the light source can be changed through optical means without increasing the volume and size of the mechanical structure. The light source module 10 provided in this embodiment of the invention has the advantages of miniaturization and simplification in structure, and can be achieved by replacing the optical thin-film element 12 with different structures to meet the needs of different illumination angles and intensities, thus providing design flexibility and precise control. In addition, the use of the optical thin-film element 12 to achieve light angle deflection in this embodiment of the invention can also avoid introducing additional optical path difference. Therefore, the light source 11 can also be a light source with strong coherence, such as a laser light source, to avoid the influence of optical path difference on beam uniformity.

[0044] In some embodiments, please see Figure 5 , which shows the structure of another existing light source, such as Figure 5 As shown, the existing light source needs to be divided into multiple regions when it is required to output light rays of multiple angles at the same time, and a certain included angle needs to be provided between different regions, or multiple light sources 11 are used, and a certain included angle needs to be provided between different light sources 11, thereby providing a more complex light source capable of outputting a light beam of multiple angles.

[0045] Unlike the prior art solution as shown in Figure 5 , the present application can provide a customizable complex multi-angle light source by providing different optical film elements 12 on different regions of the light source 11. Specifically, the light emitting surface of the light source 11 includes a plurality of sub-regions, the number of optical film elements 12 is the same as the number of sub-regions of the light emitting surface of the light source 11, and each optical film element 12 is attached to the light emitting surface of the light source 11. The surface of the optical film element 12 attached to the plurality of sub-regions has different film microstructures, different film microstructures correspond to different sub-regions, and different film microstructures have diffraction angles corresponding to the sub-regions, so that the same incident angle of light rays can be emitted at different diffraction angles when passing through the optical film elements 12 of different sub-regions, have different diffraction effects, and change the angles of light rays of different sub-regions. The optical film element 12 includes a substrate film and different epitaxial films, the substrate film is attached to the light emitting surface of the light source, and the epitaxial film is a thin film with different diffraction angles grown by epitaxy on the substrate film or a thin film with different diffraction angles attached to the substrate film. In this embodiment, the epitaxial film is a film microstructure, and the position of the epitaxial film corresponds to the sub-region of the light source 11.

[0046] In addition, the optical film elements 12 attached to the plurality of sub-regions are configured to emit after modulating the illumination light L1 into illumination light of different diffraction angles. And / or, the optical film elements 12 attached to the plurality of sub-regions are configured to emit after modulating the illumination light into illumination light of different illuminance, so as to adjust the illuminance distribution of the illumination light output by the light source module 10.

[0047] Please see Figure 6 , which shows the structure of another light source module 10 provided by the embodiment of the present application, in Figure 6In the shown example, the light output surface of the light source 11 includes three sub-regions 11a, 11b, 11c, and the number of optical film elements 12 is also three. The optical film elements 12a, 12b, 12c respectively attached to the three sub-regions 11a, 11b, 11c are configured to modulate the illumination light L1 into three different angles of illumination light L2a, L2b, L2c and then exit; and / or, the optical film elements 12a, 12b, 12c respectively attached to the three sub-regions 11a, 11b, 11c are also configured to modulate the illumination light L1 into illumination light L2a, L2b, L2c with different illuminance and then exit, so as to adjust the illuminance distribution of the illumination light output by the light source module 10.

[0048] It should be noted that, in the above description, Figure 6 In the shown example, taking the converging light of the output illumination light as an example, the modulated illumination light L2a, L2b, L2c is concentrated and output in one direction. In other embodiments, the modulated illumination light L2a, L2b, L2c can also be divergent light, or a combination of light beams in other directions, which can be set according to actual needs without being limited by the embodiments of the present application.

[0049] In some embodiments, the light source 11 can also be an AOI ring light source, and when the light source 11 is an AOI ring light source, the AOI ring light source is provided with a ring-shaped LED array in the diameter direction, and part or all of the ring-shaped LED array is attached with an optical film element 12. Please see Figure 7 which shows the structure of the light source module when the light source 11 is an AOI ring light source according to an embodiment of the present application. At this time, the ring-shaped LED array includes a ring-shaped red LED array, a ring-shaped green LED array and a ring-shaped blue LED array, and the AOI ring light source includes a ring-shaped red (R) LED array, a ring-shaped green (G) LED array and a ring-shaped blue (B) LED array arranged in order from the inside to the outside in the diameter direction. At this time, the surfaces of the ring-shaped red LED array and the ring-shaped blue LED array are attached with optical film elements 12, and the optical film elements 12 attached to the ring-shaped red LED array and the ring-shaped blue LED array have different film microstructures. The different film microstructures have different diffraction angles, and the light source module is configured to make the light fluxes consistent after exiting the AOI ring light source and the optical film elements 12 to the irradiated test board. It should be noted that, Figure 7 The AOI ring light source in the above-mentioned embodiment takes the ring-shaped red (R) LED array, the ring-shaped green (G) LED array and the ring-shaped blue (B) LED array arranged in order from the inside to the outside in the diameter direction as an example. In other embodiments, the ring-shaped LED array constituting the AOI ring light source can also be a combination of LED arrays of other wavelengths and colors, which can be designed according to actual needs.

[0050] And see Figure 8 , which shows the light path and field of view of the output light of the light source module before and after the optical film element 12 is attached to the AOI ring light source 11. The solid line represents the light path and the field of view obtained before the optical film element 12 is attached to the AOI ring light source 11, and the dashed line represents the light path and the field of view obtained after the optical film element 12 is attached to the AOI ring light source 11. As can be seen, by attaching the optical film element 12 for red R, green G, and blue B light, or by attaching the optical film element 12 with different diffraction angles, the range of the field of view FOV of the entire AOI ring light source 11 can be reduced, and the uniformity of the light can be improved.

[0051] Further, for the ring-shaped red (R) LED array, the ring-shaped green (G) LED array, and the ring-shaped blue (B) LED array, based on Figure 8 As can be seen from the solid line, the red light and the blue light have a greater impact on the range of the field of view FOV of the entire AOI ring light source 11, so the optical film can also be attached only to the ring-shaped red LED array and the ring-shaped blue LED array to deflect the angles of the light of these two wavelengths, thereby reducing the range of the field of view FOV of the AOI ring light source 11. Specifically, the optical film element attached to the ring-shaped red LED array and the optical film element attached to the ring-shaped blue LED array have different diffraction angles, and the light source module is configured to make the luminous flux emitted from the AOI ring light source and the optical film element 12 to the illuminated test board consistent.

[0052] In some embodiments, the light source 11 can also be a planar light source, as shown in Figure 9 , which shows the structure of the existing planar light source and the illuminated test board. When the planar light source is applied to the AOI device, in order to reduce the size of the AOI device, the usual way is to set mirrors on both sides to compensate for reflection, as shown in Figure 9 , so as to shorten the distance between the planar light source and the illuminated test board, and also to make full use of the light rays that cannot be emitted to the illuminated test board on both sides of the planar light source, so that the light path is turned to illuminate the illuminated test board.

[0053] The present application adjusts the angle of the light by attaching the optical film element 12 to the light source 11, so that the light at both ends of the light source 11 can compensate for the light on the illuminated test board 13. For details, please refer to Figure 10As shown, the surface on which the optical film element 12 is attached includes a first region 11d in which the main direction of illumination is perpendicular to the to-be-illuminated board 13, and a second region 11e in which the main direction of illumination is not perpendicular to the to-be-illuminated board 13. The optical film element 12d attached to the first region 11d and the optical film element 12e attached to the second region 11e have different film microstructures, the different film microstructures have different diffraction angles, and the light source module is configured to make the light fluxes consistent when the light is emitted from the planar light source 11 and the optical film element 12 to the to-be-illuminated board. The optical film element 12e on the second region 11e can deflect the light, so that the light converges and is irradiated onto the to-be-illuminated board 13, thereby increasing the uniformity of the light fluxes at different points on the to-be-illuminated board 13.

[0054] Preferably, when the light source 11 is a planar light source, the size of the planar light source and the to-be-illuminated board has a certain ratio, for example, in Figure 9 , the ratio of the size of the planar light source and the to-be-illuminated board is 2:1. When the ratio is satisfied, the light uniformity is optimal. At this time, the light flux at each point on the to-be-illuminated board is normally distributed at the corresponding point (i.e., the point position) on the planar light source. For the relationship between the point position and the light uniformity, please refer to Figure 11 .

[0055] The above-mentioned various light source modules 10 can be applied to lighting devices, such as AOI devices. Compared with the light source with a mechanically adjustable direction, the light source module 10 provided by the embodiment of the present application has a smaller size and volume, and when different light directions are needed, only different types of optical films need to be replaced.

[0056] Further, to further improve the uniformity of the output illumination light, the light source 11 can further include a transparent diffusion plate, and the optical film element 12 is attached to the transparent diffusion plate, and the transparent diffusion plate is fixedly arranged on the light output side of the light source 11. The transparent diffusion plate attached to the surface of the light source 11 can diffuse the light beam and then output the light beam, thereby obtaining uniform illumination light. Further, to realize adjustment of a larger light output direction, a mechanical structure can be provided and the light source module 10 is fixed on the mechanical structure to adjust the direction and / or position of the light source module 10. Further, to realize adjustment of a larger light output direction, multiple light source modules 10 can be provided to cover a larger angle range.

[0057] The embodiment of the present application further provides a manufacturing method of a light source module, please refer to Figure 12 , which shows a manufacturing method of a light source module provided by the embodiment of the present application. The method includes but is not limited to the following steps:

[0058] Step S10: obtaining the lighting main direction of the light source and the lighting demand angle;

[0059] In the embodiment of the present application, firstly, the demand angle of the light source based on the lighting demand and the lighting main direction of the current light source are obtained, wherein the optical film element is configured to modulate the lighting light to a preset angle and / or a preset intensity distribution before emitting, and the preset angle is equal to or close to the lighting demand angle, which can be set according to the actual lighting demand.

[0060] Step S20: judging whether the included angle between the lighting main direction of the light source and the lighting demand angle exceeds a preset angle threshold; if yes, jumping to step S30;

[0061] Then, it is needed to judge whether the included angle between the lighting main direction of the light source and the lighting demand angle exceeds a preset angle threshold, if yes, it indicates that the lighting main direction of the current light source is inconsistent with the lighting demand angle, and it is needed to jump to step S30 to adjust the lighting main direction of the light source; if no, it indicates that the lighting main direction of the current light source is basically consistent with the lighting demand angle within the error range, and it is not needed to adjust the lighting main direction of the light source. The preset angle threshold can be set according to the actual accuracy requirement of the lighting direction of the light source.

[0062] Step S30: pasting the optical film element on the light source to obtain the light source module.

[0063] When the lighting main direction of the light source is inconsistent with the lighting demand angle, it is needed to paste the film optical element on the surface of the light source to assist in modifying the light path, so as to obtain the structure of the light source module of the embodiment of the present application. Specifically, the optical film element conforming to the included angle between the lighting main direction of the light source and the lighting demand angle is pasted on the surface of the light source, so that the current lighting main direction of the light source is consistent with the lighting demand angle, and the auxiliary modification of the light path is realized.

[0064] Further, please refer to Figure 13 which shows the flow of another method for manufacturing the light source module provided by the embodiment of the present application, before pasting the optical film element on the light source, it further includes:

[0065] Step S41: obtaining the angle difference between the lighting main direction of the light source and the lighting demand angle;

[0066] Step S42: obtaining the optical film element conforming to the angle difference, wherein the optical film element is configured to modulate the lighting direction of the LED lamp bead with a specified wavelength in the light source to the lighting demand angle.

[0067] In the embodiment of the present application, the included angle between the main lighting direction of the light source and the lighting demand angle, i.e. the angle difference, can obtain an optical film element with the angle difference to adjust the main lighting direction of the light source module, so that the main lighting direction is consistent with the lighting demand angle after the adjustment of the optical film element. Specifically, to realize the auxiliary modification of the optical film element to the light path, the film microstructure of the optical film element can be designed according to the included angle between the main lighting direction of the light source and the lighting demand angle, so that the main lighting direction of the light source is consistent with the lighting demand angle after the light source is attached to the optical film element.

[0068] In addition, the optical film element needs to be selected according to the wavelength of the LED lamp bead, so that the lighting direction of the LED lamp bead with a specified wavelength in the light source can be modulated to the lighting demand angle, i.e. the optical film element is set as an optical device that can deflect the light rays with the specified wavelength, to adjust the wavelength of the light source, so that the light rays with the corresponding wavelength are deflected at the required angle based on the optical film element to assist the modification of the light path.

[0069] Further, please refer to Figure 14 which shows another method for manufacturing a light source module provided by the embodiment of the present application. The light source is an LED area light source, and the LED area light source includes a plurality of sub-regions. When the light rays of the plurality of sub-regions of the LED area light source are inconsistent, the method further includes the following steps before the optical film element is attached to the light source:

[0070] Step S51: obtaining the light ray angle of each of the plurality of sub-regions;

[0071] Step S52: obtaining an optical film element that can adjust the light ray angle of each of the plurality of sub-regions to the lighting demand angle according to the light ray angle of each of the plurality of sub-regions.

[0072] In the embodiment of the present application, when the light source is a complex light source such as an LED area light source, the LED area light source can be divided into a plurality of sub-regions, and the light ray angle of each sub-region of the complex light source can be obtained. Different optical film elements are attached to the light source according to the light ray angle of each sub-region. The positions corresponding to each sub-region in the multi-angle optical film element are respectively set to different angles to assist the light bead path modification of each sub-region in the light source.

[0073] The embodiment of the present application provides a light source module and a manufacturing method thereof. The light source module comprises a light source and an optical film element. The light source is configured to emit illumination light at an angle perpendicular to the light emitting surface of the light source. The optical film element is attached to the light emitting surface of the light source. The optical film element is configured to modulate the illumination light to a preset angle and / or a preset intensity distribution before emitting. The preset angle is an angle not perpendicular to the light emitting surface of the light source. The preset intensity is not the intensity of the illumination light directly emitted by the light source. The light source module provided by the embodiment of the present application has the advantages of miniaturization and simplification. When applied to a lighting device, the light source module occupies a smaller volume.

[0074] It should be noted that the apparatus embodiments described above are merely illustrative, and the units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, which can be located in one place or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment of the present application.

[0075] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; under the idea of the present application, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes of different aspects of the present application as described above. In order to be simple, they are not provided in details; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A light source module, characterized by Comprise: a light source configured to emit illumination light at an angle perpendicular to the light-emitting surface of the light source, the light source being an AOI ring light source, the AOI ring light source comprising a ring-shaped red LED array, a ring-shaped green LED array and a ring-shaped blue LED array arranged in order from inside to outside along the diameter direction; an optical film element comprising a substrate film and different epitaxial films, the substrate film being attached to the light-emitting surface of the light source, the epitaxial films being thin films with different diffraction angles grown by epitaxy on the substrate film or thin films with different diffraction angles attached to the substrate film; the optical film elements attached to the surface of the ring-shaped red LED array and the ring-shaped blue LED array have different thin film microstructures, the optical film elements attached to the ring-shaped red LED array and the ring-shaped blue LED array have different thin film microstructures, the different thin film microstructures have different diffraction angles, the optical film elements are configured to modulate the illumination light to a preset angle and / or a preset intensity distribution before emitting, wherein the preset angle is an angle that meets the lighting requirements, the preset intensity is an intensity that meets the lighting requirements, and the light source module is configured to make the luminous flux emitted by the AOI ring light source and the optical film element consistent on the illuminated test board.

2. The light source module of claim 1, wherein: the light-emitting surface of the light source comprises a plurality of sub-regions, the surfaces of the optical film elements attached to the plurality of sub-regions have different thin film microstructures, the different thin film microstructures correspond to different sub-regions, and the different thin film microstructures have diffraction angles corresponding to the sub-regions.

3. The light source module of claim 2, wherein: the optical film elements attached to the plurality of sub-regions are configured to modulate the illumination light to illumination light with different diffraction angles before emitting; and / or the optical film elements attached to the plurality of sub-regions are configured to modulate the illumination light to illumination light with different illuminances before emitting to adjust the illuminance distribution of the illumination light output by the light source module.

4. The light source module of claim 1, wherein: the light source further comprises a transparent diffusion plate, the optical film elements are attached to the transparent diffusion plate, and the transparent diffusion plate is fixedly arranged on the light-emitting side of the light source. The method comprises:

5. A method of manufacturing a light source module, characterized by: obtaining the main direction of illumination of the light source and the lighting requirement angle; determining whether the included angle between the main direction of illumination of the light source and the lighting requirement angle exceeds a preset angle threshold; if so, attaching an optical film element to the light source to obtain the light source module of any one of claims 1-4.

6. The method for manufacturing the light source module of claim 5, wherein: before attaching the optical film element to the light source, the method further comprises: obtaining the angle difference between the main direction of illumination of the light source and the lighting requirement angle. ​ An optical film element meeting the angle difference is acquired, wherein the optical film element is configured to modulate the illumination direction of the LED lamp bead of a specified wavelength in the light source to the lighting requirement angle.

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