CN112925156A - Light source beam combining structure and light source module - Google Patents

Abstract

A light source beam combining structure and a light source module relate to the field of projection display. The light source beam combining structure is provided with at least two beams of monochromatic light with the same color, so that the light energy can be superposed when various monochromatic lights are combined in the light source beam combining structure, the energy density of a final beam combining light source is greatly improved, and the display brightness of a corresponding image is further improved; the number of the light sources of each color is flexibly combined, so that the light sources of different colors can be flexibly configured and adjusted according to the display requirements, and the requirements of different images on different single-color light brightness are met; the laser spot welding mode of the LD laser is set to four spot welding, so that the stability of the LD laser is improved, the spacing distance between two adjacent LD lasers is reduced, the working distance of light paths of all incident light sources is synchronously reduced, and the light source coupling efficiency and the brightness of a beam combining light source are further improved.

Description

Light source beam combining structure and light source module

Technical Field

The invention relates to the field of projection display, in particular to a light source beam combining structure and a light source module.

Background

The imaging principle of the scanning projection technology is that light corresponding to each pixel point of an image to be displayed is modulated through a light source, then the light corresponding to each pixel point is scanned and output by driving a scanning optical fiber through a scanner or by the movement of a scanning mirror of a micro-electro-mechanical system, and therefore the light corresponding to each pixel point of the image to be displayed is projected onto a projection screen one by one to form a projection picture.

It should be noted that, an optical fiber scanning technology, which is one of the new scanning projection technologies, is an optical fiber scanning system generally composed of an optical fiber scanner and a light source, wherein the light source input to the optical fiber scanner is generally combined with light emitting units of multiple colors (such as red, green, and blue light emitting units). However, the existing laser light source beam combining structure has the defect of low energy density of the beam combining light source, which greatly affects the brightness of the beam combining light source corresponding to the single laser light source beam combining structure, thereby affecting the display effect of the corresponding image as a whole.

Disclosure of Invention

The invention aims to provide a light source beam combination structure which can remarkably improve the energy density of a beam combination light source, and further greatly improve the brightness of the beam combination light source on the basis of not reducing the coupling efficiency, so that the overall brightness of the final image display is improved.

Another objective of the present invention is to provide a light source module including the light source beam combining structure, which has various advantages of the light source beam combining structure.

The embodiment of the invention is realized by the following steps:

a light source beam combining structure, comprising:

the light source beam combining device comprises a shell, a first beam combining channel, a second beam combining channel and a third beam combining channel are arranged in the shell, the first beam combining channel, the second beam combining channel and the third beam combining channel are used for providing a working space for light source beam combining, two ends of the second beam combining channel are respectively communicated with the first beam combining channel and the third beam combining channel, a plurality of positioning cavities are arranged in the first beam combining channel and the third beam combining channel at intervals, incident monochromatic light corresponding to each positioning cavity is parallel and in the same direction, and at least two beams of incident monochromatic light have the same color;

the focusing lens is arranged at one end of the third beam combining channel;

and each light source combining component is arranged in the corresponding positioning cavity so that the combined light source entering the focusing lens is coincided with the main optical axis of the focusing lens.

Further, in a preferred embodiment of the present invention, the first combined beam of the first combined beam channel is perpendicular to the second combined beam of the second combined beam channel, and the second combined beam is perpendicular to the combined beam source of the third combined beam channel;

the light source beam combining structure also comprises a plurality of collimating lenses which are fixed in the shell and correspond to each incident monochromatic light one by one; the light source combining and combining component comprises a filter or/and a polarization beam splitting prism.

Further, in a preferred embodiment of the present invention, the first combined beam light, the second combined beam light and the combined beam light source are in the same plane;

the first combined beam light and the combined beam light source are parallel and opposite.

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

Further, in a preferred embodiment of the present invention, the monochromatic light incident to the first beam combining channel sequentially includes, from far to near according to the working optical path distance, first blue light, first green light and first red light, the first blue light and the first green light form first combined light after being combined in the first beam combining channel, the first combined light and the first red light perpendicular to the first combined light form second combined light, and the second combined light passes through the second beam combining channel and is incident on a beam combining member corresponding to the third beam combining channel; the beam combining component into which the second combined beam enters is a polarization beam splitting prism;

the monochromatic light incident into the third beam combining channel sequentially comprises third blue light, third green light, third red light and infrared light from far to near according to the working light path distance, and the third blue light, the third green light and the third red light are combined to be incident on the polarization beam splitter prism to be combined with the second combined beam, and then are combined with the infrared light to form a combined beam source which enters the focusing lens;

the working distance of the light path is the distance of the light path between each corresponding collimating lens and the corresponding focusing lens.

Furthermore, in a preferred embodiment of the present invention, the beam combining members into which all the monochromatic lights are incident correspondingly are optical filters, and the surfaces of each optical filter of the first beam combining channel and each optical filter of the third beam combining channel are perpendicular to each other in space;

the working distance of the light path corresponding to the first red light is greater than that of the light path corresponding to the third red light, and the working distance of the light path corresponding to the third red light is greater than that of the light path corresponding to the infrared light.

Further, in a preferred embodiment of the present invention, the housing is rectangular, a corner is disposed in four corners of the housing, the focusing lens is disposed at the corner, and a main optical axis direction of the focusing lens is parallel to a length direction of the housing; a plurality of collimating lenses are disposed on the other side of the housing opposite the primary optical axis and arranged in a linear array.

Further, in a preferred embodiment of the present invention, the light source beam combining structure further includes a plurality of LD lasers for providing monochromatic light to the corresponding collimating lenses, and the plurality of LD lasers are fixed to the housing and are adapted to the corresponding collimating lenses;

the plurality of LD lasers sequentially comprise a first blue light source laser, a first green light source laser, a first red light source laser, a third red light source laser, an infrared light source laser, a third green light source laser and a third blue light source laser along the direction of the beam combination light source.

Further, in a preferred embodiment of the present invention, each LD laser is fixed by laser spot welding, the number of the welding points of the laser spot welding is four, the welding points are arranged in a circular array, and a connection line formed by two opposite welding points forms an included angle of 45 degrees with the linear array direction of the LD lasers.

A light source module comprises the light source beam combining structure and an optical fiber, wherein the optical fiber and a focusing lens form a focusing assembly, and the optical fiber is fixed at the beam combining light source output end of the focusing lens.

The embodiment of the invention has the beneficial effects that:

according to the light source beam combining structure and the light source module, monochromatic light with the same color is set to be at least two beams, so that light energy can be superposed when various monochromatic light is combined in the light source beam combining structure, the energy density of a final combined light source is greatly improved, and the display brightness of a corresponding image is further improved; the number of the light sources of each color is flexibly combined, so that the light sources of different colors can be flexibly configured and adjusted according to the display requirements, and the requirements of different images on different single-color light brightness are met; the laser spot welding mode of the LD laser is set to four spot welding modes, so that the mutual process influence of different LD lasers during fixing is reduced, the processing production efficiency and the stability of the LD lasers are improved, the spacing distance between two adjacent LD lasers is reduced, the whole light path working distance of all incident light sources is synchronously reduced, and the coupling efficiency and the brightness of a beam combining light source are further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic three-dimensional structure diagram of a light source beam combining structure according to a first embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of an internal structure of a light source beam combining structure according to a first embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of an internal structure of a light source beam combining structure according to a second embodiment of the invention;

fig. 4 is a partial schematic end view of a light source combining structure with an LD laser according to a second embodiment of the present invention;

fig. 5 is a schematic three-dimensional structure diagram of a light source module according to a second embodiment of the invention.

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

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely vertical, but may be slightly inclined. Such as "vertical" simply means that its orientation is more vertical than "horizontal" and does not mean that the structure must be perfectly vertical, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

First embodiment

Before describing the embodiments of the present invention, the applicant first needs to explain that, in practice, the solution to increase the energy density of the beam combination light source (i.e. the display brightness corresponding to the projection image) can also be theoretically achieved by increasing the power of the single laser through adjustment, so as to increase the energy density of the monochromatic light before beam combination. However, practice shows that the technical means of increasing the power of the laser can simultaneously and greatly reduce the coupling efficiency of various light sources during beam combination coupling, so that the energy density of the final beam combination light source cannot be greatly increased, and the energy consumption cost is increased. Therefore, the applicant has filed the light source combining structure 100 of the present application.

Specifically, referring to fig. 1 and fig. 2, an embodiment of the invention provides a light source combining structure 100, which includes:

the light source combining process is performed inside the housing 120, specifically, a first combining channel 110, a second combining channel 130 and a third combining channel 150 which provide a working space for light source combining are provided inside the housing 120, wherein two ends of the second combining channel 130 are respectively communicated with the first combining channel 110 and the third combining channel 150, and the first combining channel 110 and the third combining channel 150 are both provided with a plurality of positioning cavities 170 at intervals for fixing the light source combining and combining component to combine various light sources;

the focusing lens 101, the focusing lens 101 is disposed at one end of the third beam combining channel 150, and is used for receiving the converging light source 102 and focusing the converging light source 102;

a plurality of light source combining members, each of which is disposed in a corresponding positioning chamber 170 so that the combined light source 102 entering the focusing lens 101 coincides with the main optical axis of the focusing lens 101. It should be noted that the light source combining and combining component includes the optical filter 140 or/and the polarization beam splitter prism 142, and specifically, the optical filter 140 or the polarization beam splitter prism 142 is selected according to the actual light source combining requirement, but in other embodiments, the light source combining and combining component may be other than the optical filter 140 and the polarization beam splitter prism 142.

It should be emphasized that the incident monochromatic light corresponding to each positioning cavity 170 of the light source beam combining structure 100 provided in the present embodiment is parallel and co-directional to each other, and at least two incident monochromatic lights have the same color. By setting monochromatic light of the same color to have at least two beams, the light energy can be superimposed when the various monochromatic light beams are combined in the light source combining structure 100, so that the energy density of the final combined light source 102 is greatly increased, and the display brightness of the corresponding image is further improved.

Optionally, the first combined beam 111 of the first combined beam channel 110 is perpendicular to the second combined beam 131 of the second combined beam channel 130, and the second combined beam 131 is perpendicular to the combined beam source 102 of the third combined beam channel 150; the first beam combination light 111, the second beam combination light 131 and the beam combination light source 102 are in the same plane; the first combined beam light 111 and the combined beam light source 102 are parallel and opposite.

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

Preferably, the monochromatic light incident to the first beam combining channel 110 sequentially includes a first blue light 112, a first green light 113 and a first red light 114 from far to near according to the working optical path distance, the first blue light 112 and the first green light 113 are combined in the first beam combining channel 110 to form a first combined light 111, the first combined light 111 and the first red light 114 perpendicular to the first combined light 111 are combined to form a second combined light 131, and the second combined light 131 passes through the second beam combining channel 130 to be incident to the beam combining member corresponding to the third beam combining channel 150. The combining and combining member to which the second combined beam 131 is incident is a polarization splitting prism 142.

Further preferably, the monochromatic light incident to the third beam combining channel 150 sequentially includes third blue light 152, third green light 153, third red light 154 and infrared light 151 from far to near according to the working optical path distance, and after the third blue light 152, the third green light 153 and the third red light 154 are combined, they are incident to the polarization beam splitter 142 and combined with the second combined light 131, and then combined with the infrared light 151 to form a combined light source 102, which enters the focusing lens 101. It should be noted that, the working distances of the light paths with different colors are defined according to different distances, because generally, red light has a larger influence on the projection brightness, the working distance of red light is minimized, which is beneficial to reducing the beam combination loss of red light, thereby being beneficial to improving the final projection brightness and ensuring the projection effect. Of course, in other embodiments of the present invention, not only the setting manner of the various monochromatic lights described in this embodiment is not limited, but also the working distances of the light paths corresponding to the light sources with different colors can be flexibly configured according to the adjustment principle that "the smaller the working distance of the light path, the smaller the combined beam loss of the lights, and the smaller the influence on the corresponding display effect" is, according to the actual requirement of the display effect, so as to meet the actual requirement of the display effect.

Further preferably, the beam combining and combining components corresponding to all the monochromatic lights are the optical filters 140, and the surfaces of each optical filter 140 of the first beam combining channel 110 and each optical filter 140 of the third beam combining channel 150 are perpendicular to each other in space; 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, and the optical path working distance corresponding to the third red light 154 is greater than the optical path working distance corresponding to the infrared light 151. Note that the infrared light 151 is used for scanning locus detection, laser safety detection, and the like of a corresponding optical fiber scanner.

Further, the light source combining structure 100 of the present embodiment further includes a plurality of collimating lenses 180, the plurality of collimating lenses 180 are fixed in the housing 120 and correspond to each incident monochromatic light one by one, and each incident monochromatic light passes through the corresponding collimating lens 180 and then enters the corresponding optical filter 140 to be combined with other light sources. It should be noted that the optical path working distance is an optical path distance between each collimating lens 180 and the focusing lens 101.

More specifically, the housing 120 corresponding to the light source combining structure 100 provided in the embodiment of the present invention is rectangular, a corner is disposed in four corners of the housing 120, the focusing lens 101 is disposed inside the housing 120 corresponding to the corner, and a main optical axis direction of the focusing lens 101 is parallel to a length direction of the housing 120; a plurality of collimating lenses 180 are disposed on the other side of the housing 120 opposite to the main optical axis and arranged in a linear array. It should be noted that, the above limitation is performed on the shape and the internal structure arrangement of the light source combining structure 100, so as to perform the integrated concentration of the whole light source combining structure 100 from the outer shell to the internal structure to the maximum extent, so that the occupied space is the smallest on the basis of simultaneously meeting the requirements of the optical energy coupling efficiency and the light source combining energy density, and the production and use requirements of practical popularization and application are met.

Second embodiment

Referring to fig. 2 and fig. 3, a light source beam combining structure 200 according to an embodiment of the present invention is substantially the same as the light source beam combining structure 100 according to the first embodiment, except that the light source beam combining structure 200 according to the present embodiment further includes a plurality of LD lasers 290(LD (laser diode), semiconductor lasers) for providing monochromatic light to the corresponding collimating lens 180, and the plurality of LD lasers 290 are fixed to the housing 120 and are adapted to the corresponding collimating lens 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 that the LD laser 290 is used as a light source generator for monochromatic laser light.

Specifically, the plurality of LD lasers 290 sequentially includes a first blue light source laser, a first green light source laser, a first red light source laser, a third red light source laser, an infrared light source laser, a third green light source laser, and a third blue light source laser along the direction of the combined light source 102. It should be noted that, in this embodiment, the sequential limitation of the plurality of LD lasers 290 with different colors is structurally corresponding to the limitation of the distance between the operating optical paths of the various monochromatic lights in the first embodiment, and the LD laser 290 with the corresponding color provides the monochromatic light with the corresponding color when operating. It should be further noted that, in other embodiments of the present invention, the setting manner of the LD laser 290 is not limited, and the number and the internal structure thereof may be any combination manner as long as at least two monochromatic lights with the same color are satisfied, 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; if on the basis of an infrared light source laser, the red light source laser is set into two or more, the green light source laser is set into one or more, and the blue light source laser is set into 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 multiple-in-one light source beam combining structures with different light sources can be formed.

It should be emphasized that, referring to fig. 2-4 in combination, each LD laser 290 in this embodiment is fixed by laser spot welding, and the welding points 291 of the laser spot welding are four in a circular array, and a connection line formed by two opposite welding points 291 forms an angle of 45 degrees with the linear array direction of the LD lasers 290. It should be noted that the reason why the arrangement and number of the laser spot welding are limited is that, compared with the conventional three-point spot welding (the conventional circle formed by three welding points, the radius included angle between every two welding points is 120 degrees), the four-point welding of the embodiment not only makes the LD laser 290 more stable and firm in welding, moreover, because of four-point welding, the corresponding radius included angle of every two welding points 291 is only 90 degrees, when the welding of the adjacent two LD lasers 290 is performed, the mutual influence of the processing processes becomes smaller, this can make the distance between two adjacent LD lasers 290 smaller, which is beneficial for the volume of the light source combining structure 200 to be further integrated and concentrated, meanwhile, the whole light path working distance of all incident light sources is reduced synchronously, the precision deviation is reduced, and the coupling efficiency and the brightness of the beam combining light source 102 are improved. It should be emphasized that, in other embodiments of the present invention, the laser spot welding method is not limited to the laser spot welding method described in this embodiment, and other connection fixing methods, such as adhesion, magnetic connection, and snap connection, may also be used.

Referring to fig. 1 to 5, an embodiment of the invention further provides a light source module 20, which includes the light source beam combining structure 200 provided in this embodiment and an optical fiber 201, where the optical fiber 201 and the focusing lens 101 form a focusing assembly, and the optical fiber 201 is fixed at an output end of the beam combining light source 102 of the focusing lens 101. It should be noted that, after the combined light source 102 of the light source 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 an optical fiber scanner, so as to implement the final projection display.

It should be emphasized that the working principle of the light source module provided by the embodiment of the present invention is as follows: the seven LD lasers 290 correspondingly emit corresponding monochromatic lasers when working, and the lasers enter the corresponding positioning cavities 170 and are incident on the corresponding optical filters 140 after passing through the collimating lenses 180 for collimation, and are reflected out at a reflection angle of 45 degrees with the optical filters 140; the first blue light 112 and the first green light 113 in the first combined beam channel 110 are combined to form a first combined beam 111, the first combined beam 111 and the first red light 114 are combined to form a second combined beam 131 perpendicular to the first combined beam 111, the second combined beam 131 passes through the second combined beam channel 130 and enters the polarization beam splitter prism 142 at an incident angle of 45 degrees, and simultaneously, after being combined, the third blue light 152, the third green light 153 and the third red light 154 are combined with the second combined beam 131 continuously on the polarization beam splitter prism 142, and then continuously pass through the optical filter 140 corresponding to the infrared light 151 to be combined with the infrared light 151 to form a combined beam source 102, and finally enter the focusing lens 101 to be focused and transmitted to the optical fiber 201, and the optical fiber 201 is transmitted to other scanning devices (such as an optical fiber scanner), so that final projection display is realized.

In summary, in the light source beam combining structure and the light source module provided in the embodiments of the present invention, monochromatic lights with the same color are set to have at least two beams, so that the light energy can be superimposed when the monochromatic lights are combined in the light source beam combining structure, thereby greatly increasing the energy density of the final combined light source, and further increasing the display brightness of the corresponding image; the number of the light sources of each color is flexibly combined, so that the light sources of different colors can be flexibly configured and adjusted according to the display requirements, and the requirements of different images on different single-color light brightness are met; the laser spot welding mode of the LD laser is set to four spot welding modes, so that the mutual influence of different LD lasers in fixing is reduced, the processing production efficiency and the stability of the LD lasers are improved, the spacing distance between two adjacent LD lasers is reduced, the whole light path working distance of all incident light sources is synchronously reduced, and the coupling efficiency and the brightness of a beam combining light source are further improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A light source beam combining structure, comprising:

the light source beam combining device comprises a shell, wherein a first beam combining channel, a second beam combining channel and a third beam combining channel which provide a working space for light source beam combining are arranged in the shell, two ends of the second beam combining channel are respectively communicated with the first beam combining channel and the third beam combining channel, a plurality of positioning cavities are arranged in the first beam combining channel and the third beam combining channel at intervals, incident monochromatic light corresponding to each positioning cavity is parallel and in the same direction, and at least two beams of incident monochromatic light have the same color;

the focusing lens is arranged at one end of the third beam combining channel;

the light source combining components are arranged in the corresponding positioning cavities, so that the light combining source entering the focusing lens is coincided with the main optical axis of the focusing lens.

2. The light source beam combining structure according to claim 1, wherein a first combined beam of light of the first combined beam path is perpendicular to a second combined beam of light of the second combined beam path, and the second combined beam of light is perpendicular to the combined beam of light source of the third combined beam path;

the light source beam combining structure also comprises a plurality of collimating lenses which are fixed in the shell and correspond to the incident monochromatic light one by one; the light source beam combination structure comprises a light filter or/and a polarization beam splitter prism.

3. The light source beam combining structure of claim 2, wherein the first combined beam of light, the second combined beam of light, and the combined beam of light source are in a same plane;

the first combined beam light and the combined beam light source are parallel and opposite.

4. The light source beam combining structure according to claim 3, wherein the monochromatic light incident to the third beam combining channel at least comprises red light, green light and blue light;

the monochromatic light incident to the first combined beam channel comprises red light, green light or/and blue light.

5. The light source beam combining structure according to claim 4, wherein monochromatic light incident to the first beam combining channel sequentially includes first blue light, first green light and first red light from far to near according to a working light path distance, the first blue light and the first green light form the first combined light after being combined in the first beam combining channel, the first combined light forms the second combined light with the first red light perpendicular to the first combined light, and the second combined light passes through the second beam combining channel and is incident on the beam combining end member corresponding to the third beam combining channel; the beam combining component to which the second combined beam enters is the polarization splitting prism;

the monochromatic light incident to the third beam combining channel sequentially comprises third blue light, third green light, third red light and infrared light from far to near according to the working light path distance, and the third blue light, the third green light and the third red light are incident to the polarization beam splitter prism after being combined with the second combined beam, and then are combined with the infrared light to form a combined beam source which enters the focusing lens;

the light path working distance corresponds to the light path distance between each collimating lens and the focusing lens.

6. The light source beam combining structure according to claim 5, wherein the beam combining members into which all the monochromatic lights are incident are optical filters, and the surfaces of each optical filter of the first beam combining channel and each optical filter of the third beam combining channel are perpendicular to each other in space;

the light path working distance corresponding to the first red light is greater than the light path working distance corresponding to the third red light, and the light path working distance corresponding to the third red light is greater than the light path working distance corresponding to the infrared light.

7. The light source beam combining structure according to any one of claims 2 to 6, wherein the housing is rectangular, four corners of the housing have a corner cut, the focusing lens is disposed at the corner cut, and the main optical axis direction of the focusing lens is parallel to the length direction of the housing; the plurality of collimating lenses are disposed on the other side of the housing opposite to the main optical axis and arranged in a linear array.

8. The light source beam combining structure according to claim 7, further comprising a plurality of LD lasers for providing the monochromatic light to the corresponding collimating lens, wherein the plurality of LD lasers are fixed to the housing and are adapted to the corresponding collimating lens;

the plurality of LD lasers sequentially comprise a first blue light source laser, a first green light source laser, a first red light source laser, a third red light source laser, an infrared light source laser, a third green light source laser and a third blue light source laser along the direction of the beam combining light source.

9. The light source combining structure according to claim 8, wherein each of the LD lasers is fixed by laser spot welding, and the number of the welding points of the laser spot welding is four, and a connection line formed by two opposite welding points forms an angle of 45 degrees with a linear array direction of the LD lasers.

10. A light source module, comprising the light source beam combining structure according to any one of claims 1 to 9 and an optical fiber, wherein the optical fiber and the focusing lens form a focusing assembly, and the optical fiber is fixed at the beam combining light source output end of the focusing lens.

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