Light source beam combining structure and light source module

Abstract

A light source beam combining structure and light source module, relating to the field of projection display. The light source beam combining structure arranges monochromatic light of the same color into at least two beams, enabling the superposition of light energy when various monochromatic lights are combined in the light source beam combining structure, thereby significantly increasing the energy density of the final combined light source and, in turn, improving the display brightness of the corresponding image. By flexibly combining the number of light sources of different colors, light sources of different colors can be flexibly configured and adjusted according to display requirements, thereby meeting the requirements of different images for different monochromatic light brightnesses. By setting the LD laser fixing method to four-spot welding, the stability of the LD laser is improved, and the distance between two adjacent LD lasers can be made smaller, thereby simultaneously reducing the optical path working distance of all incident light sources, thereby further improving the light source coupling efficiency and the brightness of the combined light source.

Description

Technical Field

[0001] The present invention relates to the field of projection display, and in particular to a light source beam combining structure and a light source module. Background Art

[0002] The imaging principle of scanning projection technology is to modulate the light corresponding to each pixel of the image to be displayed through a light source, and then use a scanner to drive the scanning optical fiber or the movement of a micro-electromechanical system scanning mirror to scan and output the light corresponding to each pixel, thereby projecting the light corresponding to each pixel of the image to be displayed one by one onto the projection screen to form a projection picture.

[0003] It should be noted that fiber scanning, a new type of scanning projection technology, typically consists of a fiber scanner and a light source. The light source input to the fiber scanner is typically a combination of multiple color light-emitting units (e.g., red, green, and blue). However, existing laser light source combining structures suffer from low energy density, which significantly affects the brightness of the combined light source corresponding to the individual laser light source combinations, thereby affecting the overall image display quality. Summary of the Invention

[0004] The object of the present invention is to provide a light source combining structure, which can significantly improve the energy density of the combined light source, thereby greatly improving the brightness of the combined light source without reducing the coupling efficiency, thereby improving the overall brightness of the final image display.

[0005] Another object of the present invention is to provide a light source module, which includes the above-mentioned light source beam combining structure, so that the module has various advantages of the above-mentioned light source beam combining structure.

[0006] The embodiment of the present invention is achieved as follows:

[0007] A light source beam combining structure, comprising:

[0008] A housing, wherein a first beam combining channel, a second beam combining channel, and a third beam combining channel are provided inside the housing to provide a working space for light source beam combining. The two ends of the second beam combining channel are respectively connected to the first beam combining channel and the third beam combining channel. The first beam combining channel and the third beam combining channel are both spaced apart with a plurality of positioning cavities. The incident monochromatic light corresponding to each positioning cavity is parallel to each other and at least two beams of incident monochromatic light have the same color. The direction of the incident monochromatic light of the first beam combining channel is opposite to that of the incident monochromatic light of the third beam combining channel.

[0009] A focusing lens is provided at one end of the third beam combining channel;

[0010] A plurality of light source beam combining structural components are provided, and each light source beam combining structural component is arranged in a corresponding positioning cavity so that the beam combining light source entering the focusing lens coincides with the main optical axis of the focusing lens.

[0011] Furthermore, in a preferred embodiment of the present invention, the first combined light of the above-mentioned first combining channel is perpendicular to the second combined light of the second combining channel, and the second combined light is perpendicular to the combined light source of the third combining channel; the light source combining structure also includes a plurality of collimating lenses, which are fixed in the shell and correspond one-to-one to each incident monochromatic light; the light source combining structure includes a filter and / or a polarization splitter prism.

[0012] Furthermore, in a preferred embodiment of the present invention, the first combined light beam, the second combined light beam and the combined light source are in the same plane; the first combined light beam and the combined light source are parallel and in the same direction.

[0013] Furthermore, in a preferred embodiment of the present invention, the monochromatic light incident on the third beam combining channel includes at least red light, green light and blue light; the monochromatic light incident on the first beam combining channel includes red light, green light and / or blue light.

[0014] Furthermore, in a preferred embodiment of the present invention, the monochromatic light incident on the first beam combining channel includes, in descending order according to the working optical path distance, a first blue light, a first green light, a first red light, and an infrared light. The first blue light, the first green light, and the first red light are combined in the first beam combining channel to form a first combined light beam. The first combined light beam is combined with infrared light perpendicular to the first combined light beam to form a second combined light beam. The second combined light beam passes through the second beam combining channel and is incident on a beam combining structure corresponding to the third beam combining channel. The beam combining structure on which the second combined light beam is incident is a polarization beam splitter prism.

[0015] The monochromatic light incident on the third beam combining channel includes a third blue light, a third green light and a third red light in order from far to near according to the working optical path distance. After the third blue light, the third green light and the third red light are combined, they are incident on the polarization beam splitter prism, combined with the second combined light to form a combined light source and enter the focusing lens; the optical path working distance is the optical path distance between each corresponding collimating lens and the focusing lens.

[0016] Furthermore, in a preferred embodiment of the present invention, the beam-combining structural components corresponding to the incidence of all the above-mentioned monochromatic lights are filters, and the surfaces of each filter of the first beam-combining channel and each filter of the third beam-combining channel are spatially perpendicular to each other; the optical path working distance corresponding to the first red light is greater than the optical path working distance corresponding to the third red light.

[0017] Furthermore, in a preferred embodiment of the present invention, the above-mentioned shell is in the shape of a rectangular parallelepiped, and the main optical axis direction of the focusing lens is parallel to the length direction of the shell; the multiple collimating lenses corresponding to the first beam combining channel and the multiple collimating lenses corresponding to the third beam combining channel are arranged on opposite sides of the shell along the width direction, and the multiple collimating lenses on each side of the shell are arranged at equal intervals.

[0018] Furthermore, in a preferred embodiment of the present invention, the light source beam combining structure further comprises a plurality of LD lasers providing monochromatic light to corresponding collimating lenses, wherein the plurality of LD lasers are fixed to the housing and adapted to the corresponding collimating lenses;

[0019] The multiple LD lasers corresponding to the first beam combining channel include a first blue light source laser, a first green light source laser, a first red light source laser and an infrared light source laser in sequence along the direction of the first combined beam light; the multiple LD lasers corresponding to the third beam combining channel include a third blue light source laser, a third green light source laser and a third red light source laser in sequence along the direction of the combined light source.

[0020] Furthermore, in a preferred embodiment of the present invention, each of the above-mentioned LD lasers is fixed by laser spot welding, and the laser spot welding points are four arranged in a circular array, and the line formed by two opposite welding points forms an angle of 45 degrees with the main optical axis direction of the focusing lens.

[0021] A light source module comprises the above-mentioned light source beam combining structure and an optical fiber. The optical fiber and a focusing lens form a focusing assembly, and the optical fiber is fixed to the beam combining light source output end of the focusing lens.

[0022] The beneficial effects of the embodiments of the present invention are:

[0023] The light source beam combining structure and light source module provided by the embodiment of the present invention set the monochromatic light of the same color to have at least two beams, so that the various monochromatic lights can be superimposed with light energy when being combined in the light source beam combining structure, thereby greatly improving the energy density of the final combined light source, and then improving the display brightness of the corresponding image; by flexibly combining the number of light sources of different colors, it is possible to flexibly configure and adjust light sources of different colors according to display requirements, thereby meeting the requirements of different images for different monochromatic light brightness; by setting the laser spot welding method of the LD laser to four-spot welding, the mutual process influence of different LD lasers during fixation is reduced, the processing production efficiency and the stability of the LD laser are improved, and at the same time, the distance between two adjacent LD lasers becomes smaller, and the overall optical path working distance of all incident light sources is simultaneously reduced, further improving the coupling efficiency and the brightness of the combined light source. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the three-dimensional structure of the light source beam combining structure provided in the first embodiment of the present invention;

[0026] Figure 2 A schematic cross-sectional view of the internal structure of the light source beam combining structure provided by the first embodiment of the present invention;

[0027] Figure 3 A schematic cross-sectional view of the internal structure of a light source beam combining structure provided in a second embodiment of the present invention;

[0028] Figure 4 A partial schematic diagram of the end face of an LD laser corresponding to the light source beam combining structure provided in the second embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the three-dimensional structure of a light source module provided by the second embodiment of the present invention.

[0030] Icons: 100-light source beam combining structure; 200-light source beam combining structure; 20-light source module; 101-focusing lens; 102-beam combining light source; 110-first beam combining channel; 111-first combined beam; 112-first blue light; 113-first green light; 114-first red light; 120-housing; 130-second beam combining channel; 131-second combined beam; 140-filter; 142-polarization beam splitter; 150-third beam combining channel; 151-infrared light; 152-third blue light; 153-third green light; 154-third red light; 170-positioning cavity; 180-collimating lens; 201-optical fiber; 290-LD laser; 291-welding point. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or location relationships based on the positions or location relationships shown in the accompanying drawings, or the positions or location relationships in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Furthermore, the terms "horizontal," "vertical," and "perpendicular" do not necessarily imply that a component must be absolutely vertical, but rather that it can be slightly tilted. For example, "vertical" simply means that its direction is more vertical than "horizontal," and does not mean that the structure must be completely vertical, but rather that it can be slightly tilted.

[0036] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] First embodiment

[0038] Before explaining the embodiments of the present invention, the applicant first needs to explain that, in fact, in order to solve the problem of improving the energy density of the combined light source (i.e., the display brightness of the corresponding projected image), theoretically, it is also possible to increase the power of a single laser by adjusting it, thereby increasing the energy density of the monochromatic light before combining. However, it has been found in practice that by increasing the power of the laser, the coupling efficiency of various light sources during beam coupling will be greatly reduced, so it is not possible to achieve a substantial increase in the energy density of the final combined light source, but rather increase the energy consumption cost. Therefore, the applicant has applied for the light source combining structure 100 of the present application scheme.

[0039] Specifically, please refer to Figure 1 and Figure 2 The embodiment of the present invention provides a light source beam combining structure 100, which includes:

[0040] The housing 120 is used for the light source combining process. Specifically, the housing 120 is provided with a first beam combining channel 110, a second beam combining channel 130, and a third beam combining channel 150, which provide a working space for light source combining. The two ends of the second beam combining channel 130 are connected to the first beam combining channel 110 and the third beam combining channel 150, respectively. The first beam combining channel 110 and the third beam combining channel 150 are each provided with a plurality of positioning cavities 170 at intervals for fixing the light source combining structure to combine various light sources.

[0041] A focusing lens 101 is provided at one end of the third beam combining channel 150 and is used to receive the beam combining light source 102 and focus the beam combining light source 102;

[0042] Multiple light source beam combining structures are provided, each of which is disposed in a corresponding positioning cavity 170 so that the beam combining light source 102 entering the focusing lens 101 coincides with the principal optical axis of the focusing lens 101. It should be noted that the light source beam combining structure includes a filter 140 and / or a polarization beam splitter prism 142. Whether the filter 140 or the polarization beam splitter prism 142 is specifically selected based on the actual light source beam combining requirements. Of course, in other embodiments, other light source beam combining structures other than the filter 140 and the polarization beam splitter prism 142 may also be used.

[0043] It should be emphasized that the incident monochromatic light beams corresponding to each positioning cavity 170 of the light source beam combining structure 100 provided in this embodiment are parallel to each other, at least two beams of incident monochromatic light beams have the same color, and the incident monochromatic light beams of the first beam combining channel 110 and the incident monochromatic light beams of the third beam combining channel 150 are in opposite directions. It should be noted that by providing at least two beams of monochromatic light beams of the same color, the various monochromatic light beams can be superimposed when being combined in the light source beam combining structure 100, thereby significantly improving the energy density of the final combined light source 102 and thereby improving the display brightness of the corresponding image.

[0044] Further optionally, the first combined light 111 of the first combined light channel 110 is perpendicular to the second combined light 131 of the second combined light channel 130, and the second combined light 131 is perpendicular to the combined light source 102 of the third combined light channel 150; the first combined light 111, the second combined light 131 and the combined light source 102 are in the same plane; the first combined light 111 and the combined light source 102 are parallel and in the same direction.

[0045] More specifically, the monochromatic light incident on the third beam combining channel 150 includes at least red light, green light and blue light; the monochromatic light incident on the first beam combining channel 110 includes red light, green light and / or blue light.

[0046] Preferably, the monochromatic light incident on the first beam-combining channel 110 includes, in descending order of working optical path distance, a first blue light 112, a first green light 113, a first red light 114, and an infrared light 151. The first blue light 112, the first green light 113, and the first red light 114 are combined in the first beam-combining channel 110 to form a first combined light beam 111. The first combined light beam 111 is combined with infrared light 151 perpendicular to the first combined light beam 111 to form a second combined light beam 131. The second combined light beam 131 passes through the second beam-combining channel 130 and is incident on the corresponding beam-combining structure of the third beam-combining channel 150. It should be noted that the beam-combining structure onto which the second combined light beam 131 is incident is a polarization beam splitter prism 142. Furthermore, the infrared light 151 is used for scanning trajectory detection and laser safety detection of the corresponding fiber scanner.

[0047] Further preferably, the monochromatic light incident on the third beam combining channel 150 includes, in descending order of working optical path distance, a third blue light 152, a third green light 153, and a third red light 154. After being combined, the third blue light 152, the third green light 153, and the third red light 154 are incident on the polarization beam splitter prism 142, where they are combined with the second combined light beam 131 to form a combined light source 102, which then enters the focusing lens 101. It should be noted that the reason for limiting the working distances of the optical paths of different colors to different distances is that, generally speaking, red light has a greater impact on projection brightness. Therefore, minimizing the working distance of red light is beneficial for reducing the beam combining loss of red light, thereby improving the final projection brightness and ensuring the projection effect. Of course, other embodiments of the present invention are not limited to the various monochromatic light distance settings described in this embodiment. Based on the actual display effect requirements, the working distances of the optical paths corresponding to different color light sources can be flexibly configured based on the principle of "the smaller the optical path working distance, the smaller the light beam combining loss, and thus the smaller the impact on the corresponding display effect" to meet the actual display effect requirements.

[0048] Further preferably, the beam-combining structural components corresponding to the incident light of all the above-mentioned monochromatic lights are filters 140, and the surfaces of each filter 140 of the first beam-combining channel 110 and each filter 140 of the third beam-combining channel 150 are spatially perpendicular to each other; the optical path working distance corresponding to the first red light 114 is greater than the optical path working distance corresponding to the third red light 154.

[0049] Furthermore, the light source beam combining structure 100 provided in this embodiment also includes a plurality of collimating lenses 180. These collimating lenses 180 are fixed within the housing 120 and correspond one to each incident monochromatic light beam. Each incident monochromatic light beam passes through a corresponding collimating lens 180 and then enters a corresponding filter 140 for beam combining with other light sources. It should be noted that the optical path working distance is the optical path distance between each corresponding collimating lens 180 and the focusing lens 101.

[0050] More specifically, the housing 120 of the light source beam combining structure 100 provided in this embodiment is in the shape of a rectangular parallelepiped, and the main optical axis direction of the focusing lens 101 is parallel to the length direction of the housing 120; the multiple collimating lenses 180 corresponding to the first beam combining channel 110 and the multiple collimating lenses 180 corresponding to the third beam combining channel 150 are arranged on opposite sides of the housing 120 along the width direction, and the multiple collimating lenses 180 on each side of the housing 120 are arranged at equal intervals. It should be noted that the above-mentioned restrictions on the shape and internal structure arrangement of the light source beam combining structure 100 are imposed in order to integrate and concentrate the entire light source beam combining structure 100 from the outer shell to the internal structure to the maximum extent, so that it can minimize the space occupied while meeting the requirements of light energy coupling efficiency and light source beam combining energy density, thereby meeting the production and use requirements of actual promotion and application.

[0051] Second embodiment

[0052] Please refer to Figure 2 and Figure 3 The embodiment of the present invention provides a light source beam combining structure 200, which is substantially the same as the light source beam combining structure 100 provided in the first embodiment, except that the light source beam combining structure 200 provided in this embodiment further includes a plurality of LD lasers 290 (LD (Laser Diode), semiconductor lasers) for providing monochromatic light to the corresponding collimating lenses 180, and the plurality of LD lasers 290 are fixed to the housing 120 and adapted to the corresponding collimating lenses 180. It should be noted that the light source beam combining structure 200 provided in this embodiment is mainly used in the field of laser projection display, so the LD laser 290 is used as a light source generator of monochromatic laser light. In other embodiments of the present invention, it is not limited to this embodiment. When the light sources of the projection display are different, the type of light source generator can be flexibly configured according to the different properties of the light source.

[0053] More specifically, the multiple LD lasers 290 corresponding to the first beam combining channel 110 sequentially include a first blue light source laser, a first green light source laser, a first red light source laser, and an infrared light source laser along the direction of the first combined light beam 111; the multiple LD lasers 290 corresponding to the third beam combining channel 150 sequentially include a third blue light source laser, a third green light source laser, and a third red light source laser along the direction of the combined light source 102. It should be noted that this embodiment sequentially limits the multiple LD lasers 290 of different colors, forming a structural correspondence with the distance restrictions on the working optical paths of various monochromatic lights in the first embodiment. The LD lasers 290 of corresponding colors provide monochromatic light of corresponding colors when in operation. It should be further explained that, in other embodiments of the present invention, the setting method of the LD laser 290 is not limited to the above-mentioned one. Its quantity and internal structure can be any combination, as long as there are at least two beams of monochromatic light of the same color, such as a four-in-one light source beam combining structure composed of two red light source lasers, one green light source laser and one blue light source laser; for example, on the basis of an infrared light source laser, the red light source lasers are set to two or more, the green light source lasers are set to one or more, and the blue light source lasers are set to one or more, so that a five-in-one light source beam combining structure, a six-in-one light source beam combining structure, a seven-in-one light source beam combining structure, an eight-in-one light source beam combining structure, a nine-in-one light source beam combining structure and other multi-in-one light source beam combining structures with different numbers of light sources will be formed.

[0054] It should be emphasized that please refer to Figure 2-Figure 4In this embodiment, each LD laser 290 is fixed by laser spot welding, and the laser spot welding points 291 are four arranged in a circular array, and the line formed by two opposite welding points 291 is at an angle of 45 degrees to the main optical axis direction of the focusing lens 101. It should be noted that the reason for limiting the arrangement and number of laser spot welding is that, compared with the traditional three-point spot welding method (the circle formed by the traditional three welding points 291, the radius angle corresponding to each two welding points 291 is 120 degrees), the four-point welding of this embodiment not only makes the LD laser 290 welded and fixed more stable and firm, but also because of the four-point welding, the radius angle corresponding to each two welding points 291 is only 90 degrees, so when welding two adjacent LD lasers 290, the mutual influence of the processing technology becomes smaller, which can make the distance between the two adjacent LD lasers 290 smaller, which is conducive to further integration and concentration of the light source beam combining structure 200. At the same time, it is also conducive to synchronously reducing the overall optical path working distance of all incident light sources, reducing precision deviation, and improving coupling efficiency and the brightness of the beam combining light source 102. It should be emphasized that in other embodiments of the present invention, it is not limited to the laser spot welding method described in this embodiment, and it can also be other connection and fixing methods, such as bonding, magnetic connection, and snap connection.

[0055] Please refer to Figure 1-Figure 5 The embodiment of the present invention further provides a light source module 20, which includes the aforementioned light source beam combining structure 200 and an optical fiber 201. The optical fiber 201 and the focusing lens 101 constitute a focusing assembly, and the optical fiber is fixed to the output end of the beam combining light source 102 of the focusing lens 101. It should be noted that after the beam combining light source 102 of the light source beam combining structure 200 enters the focusing lens 101 and is output to the optical fiber 201, the optical fiber 201 can be transmitted to other scanning devices, such as a fiber scanner, to achieve the final projection display.

[0056] It should be emphasized that the working principle of the light source module 20 provided in the embodiment of the present invention is as follows: seven LD lasers 290 work to emit corresponding monochromatic lasers, which are collimated by the collimating lens 180, enter the corresponding positioning cavity 170 and are incident on the corresponding filter 140, and are reflected at a reflection angle of 45 degrees to the filter 140; wherein, the first blue light 112, the first green light 113 and the first red light 114 are combined in the first beam combining channel 110 to form a first combined light beam 111, and the first combined light beam 111 is perpendicular to the first combined light beam 111. The infrared light 151 of 11 is combined to form a second combined light beam 131, and the second combined light beam 131 passes through the second combining channel 130 and is incident on the polarization splitter prism 142 corresponding to the third combining channel 150; at the same time, the third blue light 152, the third green light 153 and the third red light are combined and incident on the polarization splitter prism 142, and combined with the second combined light beam 131 to form a combined light source 102, which enters the focusing lens 101 and is transmitted to the optical fiber 201, and the optical fiber 201 is then transmitted to other scanning devices (such as a fiber scanner), thereby realizing the final projection display.

[0057] In summary, the light source beam combining structure and light source module provided by the present invention, by setting the monochromatic light of the same color to have at least two beams, can superimpose the light energy of various monochromatic lights when they are combined in the light source beam combining structure, thereby greatly improving the energy density of the final combined light source, and then improving the display brightness of the corresponding image; by flexibly combining the number of light sources of different colors, it is possible to flexibly configure and adjust light sources of different colors according to display requirements, thereby meeting the requirements of different images for different monochromatic light brightness; by setting the laser spot welding method of the LD laser to four-spot welding, the mutual process influence of different LD lasers during fixation is reduced, the processing production efficiency and the stability of the LD laser are improved, and at the same time, the distance between two adjacent LD lasers becomes smaller, and the overall optical path working distance of all incident light sources is simultaneously reduced, further improving the coupling efficiency and the brightness of the combined light source.

[0058] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A light source beam combining structure, characterized in that: It includes: A shell, wherein a first beam combining channel, a second beam combining channel, and a third beam combining channel are provided inside the shell to provide a working space for light source beam combining, the two ends of the second beam combining channel are respectively connected to the first beam combining channel and the third beam combining channel, the first beam combining channel and the third beam combining channel are both spaced apart with a plurality of positioning cavities, the incident monochromatic light corresponding to each positioning cavity is parallel to each other and at least two beams of the incident monochromatic light have the same color, and the direction of the incident monochromatic light of the first beam combining channel is opposite to that of the incident monochromatic light of the third beam combining channel; a focusing lens, the focusing lens being arranged at one end of the third beam combining channel; A plurality of light source beam combining structures, each of which is disposed in a corresponding positioning cavity so that the beam combining light source entering the focusing lens coincides with the main optical axis of the focusing lens; The monochromatic light incident on the first beam combining channel includes, in descending order according to the optical path working distance, a first blue light, a first green light, a first red light, and an infrared light. The first blue light, the first green light, and the first red light are combined in the first beam combining channel to form a first combined light beam. The first combined light beam is combined with the infrared light perpendicular to the first combined light beam to form a second combined light beam. The second combined light beam passes through the second beam combining channel and is incident on the beam combining structure corresponding to the third beam combining channel. The beam combining structure on which the second combined light beam is incident is a polarization beam splitter prism. The monochromatic light incident on the third beam combining channel includes, in order from far to near according to the optical path working distance, a third blue light, a third green light, and a third red light. After being combined, the third blue light, the third green light, and the third red light are incident on the polarization beam splitter prism, and are combined with the second combined light to form the combined light source and enter the focusing lens. The optical path working distance is the optical path distance between each collimating lens and the focusing lens.

2. The light source beam combining structure according to claim 1, characterized in that: The first combined light beam of the first beam combining channel is perpendicular to the second combined light beam of the second beam combining channel, and the second combined light beam is perpendicular to the combined light source of the third beam combining channel; The light source beam combining structure includes a plurality of collimating lenses, which are fixed in the housing and correspond one to one to each incident monochromatic light; the light source beam combining structure includes a filter and / or a polarization beam splitter prism.

3. The light source beam combining structure according to claim 2, characterized in that: The first combined light beam, the second combined light beam, and the combined light source are in the same plane; The first combined light beam and the combined light source are parallel and in the same direction.

4. The light source beam combining structure according to claim 2, characterized in that: The beam combining structural components corresponding to all the incident monochromatic lights are filters, and the surfaces of each filter of the first beam combining channel and each filter of the third beam combining channel are spatially perpendicular to each other; The optical path working distance corresponding to the first red light is greater than the optical path working distance corresponding to the third red light.

5. The light source beam combining structure according to any one of claims 1 to 4, characterized in that: The shell is in the shape of a rectangular parallelepiped, and the main optical axis direction of the focusing lens is parallel to the length direction of the shell; the multiple collimating lenses corresponding to the first beam combining channel and the multiple collimating lenses corresponding to the third beam combining channel are arranged on opposite sides of the shell along the width direction, and the multiple collimating lenses on each side of the shell are arranged at equal intervals.

6. The light source beam combining structure according to claim 5, characterized in that: The light source beam combining structure further includes a plurality of LD lasers for providing the monochromatic light to the corresponding collimating lenses, wherein the plurality of LD lasers are fixed to the housing and adapted to the corresponding collimating lenses; The multiple LD lasers corresponding to the first beam combining channel include, in sequence, a first blue light source laser, a first green light source laser, a first red light source laser and an infrared light source laser along the direction of the first combined beam; the multiple LD lasers corresponding to the third beam combining channel include, in sequence, a third blue light source laser, a third green light source laser and a third red light source laser along the direction of the combined light source.

7. The light source beam combining structure according to claim 6, characterized in that: Each LD laser is fixed by laser spot welding, and the laser spot welding points are four arranged in a circular array, and the line formed by two opposite welding points forms an angle of 45 degrees with the main optical axis direction of the focusing lens.

8. A light source module, characterized in that: It comprises the light source beam combining structure and optical fiber according to any one of claims 1 to 7, wherein the optical fiber and the focusing lens constitute a focusing assembly, and the optical fiber is fixed to the beam combining light source output end of the focusing lens.

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