CN214540353U - 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 a plurality of positioning cavities in the through channel, and the positioning planes of the positioning cavities are provided with notches, so that the optical filter is more accurate and faster in plane positioning and fixing and angle determination; the spacing surface and the space transition surface which keeps the spacing with the end part of the optical filter are arranged, so that the assembly space of the optical filter is more abundant, the assembly difficulty is reduced, and the fixing efficiency and the precision of the optical filter in a three-dimensional space are improved.

Description

Light source beam combining structure and light source module

Technical Field

The utility model relates to a projection display field particularly, relates to a light source closes and restraints structure and 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 problems of high assembly processing difficulty, low efficiency and poor precision, which greatly affects the coupling efficiency of light and the output stability of the combined light source.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a light source closes and restraints structure, it can show and reduce the assembly processing degree of difficulty, improves the efficiency of the accurate location of light filter, so it possesses the high and high advantage of system precision of assembly production efficiency.

Another object of the utility model is to provide a light source module, it possesses the light path coupling efficiency height, closes the advantage that beam light source output quality and stability are good.

The embodiment of the utility model is realized like this:

a light source beam combining structure, comprising:

the light source beam combining device comprises a shell, a light source and a light source, wherein a through channel for providing a working space for light source beam combining is arranged in the shell, and a plurality of positioning cavities are formed in the inner wall of the through channel at intervals along the length direction;

the optical filters correspond to the positioning cavities one by one, and part of the surface of each optical filter is fixed on the side wall of the corresponding positioning cavity so as to enable the reflection light paths of each optical filter to be superposed when the optical filters carry out light source beam combination;

the side wall of the positioning cavity is a positioning plane, the side wall of the positioning cavity adjacent to the positioning plane is a limiting surface and a space transition surface respectively, and a notch is arranged at the intersection angle of the positioning plane and the limiting surface and is positioned on the positioning plane; the two opposite ends of the optical filter respectively prop against the limiting surface and keep a gap with the space transition surface.

Further, in a preferred embodiment of the present invention, the limiting surface is perpendicular to the positioning plane, and the space transition surface and the positioning plane form an obtuse angle.

Further, in the preferred embodiment of the present invention, the light source beam combining structure further includes a focusing lens, the focusing lens is fixedly connected to the housing and corresponds to one end of the through channel, and the main optical axis of the focusing lens coincides with the reflection optical path corresponding to each optical filter.

Furthermore, in a preferred embodiment of the present invention, the fixing manner of each optical filter and the focusing lens in the housing is bonding; the main optical axis of the focusing lens forms an included angle of 45 degrees with the surface of each optical filter.

Further, in the preferred embodiment of the present invention, the light source combining structure further includes a plurality of collimating lenses, the collimating lenses are fixed in the housing and correspond to the light filters one by one, the main optical axis of each collimating lens intersects with the main optical axis of the focusing lens perpendicularly at the same point on the corresponding light filter, and the focusing lens and each collimating lens are located at the same side of the corresponding light filter.

Furthermore, in the preferred embodiment of the present invention, the cavity structures of the positioning cavities are the same, and are sequentially arranged at equal intervals along the length direction of the through channel; the space of each positioning cavity close to the corresponding collimating lens is a transition space; the limiting surface is far away from the corresponding transition space, and one side wall corresponding to the transition space is a corresponding space transition surface.

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

Further, in the preferred embodiment of the present invention, the plurality of LD lasers include a red light source laser, a green light source laser, a blue light source laser and an infrared light source laser, and the setting modes of the blue light source laser and the infrared light source laser satisfy: the red light working distance is less than the green light working distance, the green light working distance is less than the blue light working distance, and the blue light working distance is less than the infrared light working distance; the working distance refers to the optical path distance between each collimating lens and the focusing lens.

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 utility model provides a beneficial effect is: the embodiment of the utility model provides a light source closes and restraints structure is through setting up a plurality of location chambeies in running through the passageway, and set up the notch on the location plane in location chamber, make the light filter carry out more accurate and swift when plane location is fixed and the angle is confirmed on location plane, through setting up spacing face and keep spaced space transition face with the light filter tip, make the light filter can fix a position more rapidly in the plane, also make the assembly space of light filter more abundant simultaneously, the assembly degree of difficulty has been reduced, the fixed efficiency of light filter and the precision on the three-dimensional space have further been improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required 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 perspective view of a light source beam combining structure according to a first embodiment of the present invention;

fig. 2 is a cross-sectional view of a light source beam combining structure provided by a first embodiment of the present invention, along a plane where a light path works;

fig. 3 is a cross-sectional view of a light source beam combining structure provided by a second embodiment of the present invention, along a plane where a light path works;

fig. 4 is a cross-sectional view of a light source beam combining structure provided by a third embodiment of the present invention, along a plane where a light path works;

fig. 5 is a schematic perspective view of a light source module according to a third embodiment of the present invention;

fig. 6 is a cross-sectional view of a light source module according to a third embodiment of the present invention, the light source module is located along a plane where a light path works.

Icon: 30-a light source module; 100-a light source beam combining structure; 200-a light source beam combining structure; 300-light source beam combining structure; 110-a housing; 120-a through channel; 130-an optical filter; 140-a positioning cavity; 142-a positioning plane; 143-a notch; 144-a limiting surface; 146-a spatial transition surface; 250-a focusing lens; 260-a collimating lens; 262-a transition space; 301-an optical fiber; 380-LD laser; 382-a red light source laser; 384-green light source laser; 386-blue light source laser; 388-infrared source laser.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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, as 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 accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the term refers must have a specific position, be constructed and operated in a specific orientation, 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, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

First embodiment

Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a light source combining structure 100, which includes a housing 110, a through channel 120 for providing a working space for light source combining is disposed inside the housing 110, and a plurality of positioning cavities 140 are disposed at intervals along a length direction on an inner wall of the through channel 120. It should be noted that, for the purpose of description, the casing 110 in the embodiment of the present invention is a rectangular parallelepiped structure, the through channel 120 is a hollow cylindrical channel, and the through channel 120 penetrates along the length direction inside the casing 110. It should be emphasized that, in other embodiments of the present invention, the shape structure of the housing 110 and the through channel 120 is not limited to the one described in the embodiment, as long as the structural design can achieve the effect of the housing 110 and the through channel 120 in the embodiment.

Further, the embodiment of the present invention provides a light source closes and restraints structure 100 still includes a plurality of filters 130, a plurality of filters 130 and a plurality of location chamber 140 one-to-one, and the partial surface of every filter 130 is fixed in on the lateral wall that corresponds location chamber 140 to make every filter 130 carry out the light source and close the reflection light path coincidence when restrainting. It should be noted that, preferably, four optical filters 130 and four positioning cavities 140 are provided in the present embodiment, and are respectively used for providing coupling spaces for the red laser light source, the green laser light source, the blue laser light source, and the infrared laser light source. It should be emphasized that, in other embodiments of the present invention, the number of the positioning cavities 140 is not limited to the present embodiment, and other numbers, such as 3 or 5, may also be adopted, and the configuration is flexible according to the requirement of combining the light sources.

Further, the sidewall of the positioning cavity 140 for fixing the optical filter 130 is a positioning plane 142, which is mainly used for enabling the optical filter 130 to permanently maintain a fixed spatial state on the basis of flat attachment with the optical filter 130, so that in the fixing and attaching process, it is required to maintain the surfaces of the optical filter 130 and the positioning plane 142 as flat as possible, so that the optical filter 130 can be quickly positioned and can maintain the relative parallelism of the attachment surfaces, and the requirement for the accuracy of the spatial state of the optical filter 130 is met, and therefore the design scheme of this embodiment is as follows: the side wall of the positioning cavity 140 adjacent to the positioning plane 142 is respectively a limiting surface 144 and a space transition surface 146, a notch 143 is arranged at the intersection angle of the positioning plane 142 and the limiting surface 144, and the notch 143 is arranged on the positioning plane 142; the opposite ends of the filter 130 respectively contact the limiting surface 144 and keep a space with the space transition surface 146. It should be noted that the notch 143 is formed on the positioning plane 142 because the inner space of the positioning cavity 140 is very small, the processing difficulty is very high, and it is difficult to process the intersection of the positioning plane 142 and the limiting surface 144 to the processing precision of the plane, which easily causes stress concentration or uneven distribution at the intersection, thereby causing unevenness (e.g., generating macro or micro burrs) at the intersection of the positioning plane 142, and this embodiment skillfully solves the above problem by forming the notch 143 on the positioning plane 142, which not only reduces the difficulty of precision processing, but also ensures the flatness at the intersection of the positioning plane 142. It should be noted that, by providing the limiting surface 144 and the space transition surface 146 spaced from the end of the optical filter 130, the optical filter 130 can be more quickly positioned on the positioning plane 142 when being assembled and fixed, so as to improve the assembly efficiency and the precision in the three-dimensional space, and meanwhile, the assembly space of the optical filter 130 is more abundant, thereby reducing the assembly difficulty.

Further preferably, in this embodiment, the limiting surface 144 corresponding to the positioning cavity 140 is perpendicular to the positioning plane 142, and the space transition surface 146 and the positioning plane 142 form an obtuse angle, and the preferred obtuse angle is 135 degrees. It should be noted that, the limiting surface 144 is perpendicular to the positioning plane 142 in this embodiment, on one hand, the processing difficulty of the notch 143 is lower and more convenient, and on the other hand, the positioning is fast and conveniently performed when the filter 130 touches the limiting surface 144; the obtuse angle between the space transition surface 146 and the positioning plane 142 is mainly to increase the space between the space transition surface 146 and the positioning plane 142, so that the positioning cavity 140 has sufficient space to facilitate the assembly and fixation of the optical filter 130. It should be noted that, in other embodiments of the present invention, the size of the obtuse angle is not limited to 135 degrees as in this embodiment, and other reasonable obtuse angles, such as 120 degrees, 150 degrees, etc., may also be set according to the spatial arrangement of the whole positioning cavity 140, as long as when the optical filter 130 is assembled, the space corresponding to the positioning cavity 140 is sufficient, so as to facilitate the accurate positioning and fixing thereof quickly and conveniently.

Second embodiment

Referring to fig. 1 to fig. 3, the present embodiment 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 the present embodiment further includes a focusing lens 250, the focusing lens 250 is fixedly connected to one end of the casing 110 corresponding to the through channel 120, and a main optical axis of the focusing lens 250 is overlapped with a reflection optical path corresponding to each optical filter 130, so as to ensure that different monochromatic lasers can be combined into one beam to enter the focusing lens 250 after being reflected or/and refracted by the optical filters 130.

Optionally, in this embodiment, each of the optical filters 130 and the focusing lens 250 is fixed in the housing 110 in an adhesion manner, and a main optical axis of the focusing lens 250 forms an included angle of 45 degrees with a surface of each of the optical filters 130. It should be noted that the bonding and fixing manner of the optical filter 130 and the focusing lens 250 is the preferable scheme of the present embodiment, and the optical filter is screened out by a plurality of indexes such as process complexity, fixing effect and working stability after the utility model passes through a plurality of fixing manners; the reason why the main optical axis of the focusing lens 250 forms a 45-degree angle with the surface of each optical filter 130 is that, through the continuous optical coupling test utility model, it is found that, after the laser source is incident at a 45-degree angle with the optical filter 130, the laser reflected or refracted at a 45-degree angle with the optical filter 130 finally enters the focusing lens 250 with the greatest coupling efficiency.

Further, the light source beam combining structure 200 in this embodiment further includes four collimating lenses 260, the four collimating lenses 260 are fixed in the housing 110 and correspond to the four optical filters 130 one by one, a main optical axis of each collimating lens 260 and a main optical axis of the focusing lens 250 are perpendicularly intersected at the same point on the corresponding optical filter 130, and the focusing lens 250 and each collimating lens 260 are located at the same side of the corresponding optical filter 130. The relative positions of the collimating lens 260, the focusing lens 250 and the optical filter 130 are set so that the laser light source emitted from the collimating lens 260 can be incident on the corresponding optical filter 130 at an incident angle of 45 degrees, and finally emitted onto the main optical axis of the focusing lens 250 at a reflection angle or a refraction angle of 45 degrees.

Further optionally, the four positioning cavities 140 in this embodiment have the same cavity structure, and are sequentially arranged at equal intervals along the length direction of the through channel 120; the space of each positioning cavity 140 near the corresponding collimating lens 260 is a transition space 262, the limiting surface 144 is far away from the corresponding transition space 262, and one side wall corresponding to the transition space 262 is a corresponding space transition surface 146. It should be noted that the positioning cavities 140 are sequentially arranged at equal intervals, so as to keep the working optical paths of the light sources with different colors to have the same optical path difference, and reduce the influence of different sizes of the optical path difference on the coupling efficiency and the light source beam combination as much as possible. The spatial position limitation of the transition space 262 can provide convenience in spatial operation for the assembly of the optical filter 130 on one hand, and on the other hand, before the monochromatic collimated light source enters the optical filter 130, the transition space 262 can reduce the interference influence of the dissipated light on the monochromatic collimated light on the other hand, which is beneficial to the improvement of the whole light source coupling efficiency of the light source beam combining structure 100.

Third embodiment

Referring to fig. 1 to 4, the present embodiment provides a light source beam combining structure 300, which is substantially the same as the light source beam combining structure 200 provided in the second embodiment, except that the light source beam combining structure 300 provided in the present embodiment further includes a plurality of LD lasers 380 (LD) for providing monochromatic laser light to the corresponding collimating lens 260, a semiconductor laser, and a plurality of LD lasers 380 fixed to the housing 110 and adapted to the corresponding collimating lens 260. It should be noted that the light source beam combining structure 100 provided in this embodiment is mainly used in the field of laser projection display, so that the LD laser 380 is used as a laser light source generator, in other embodiments of the present invention, the laser light source beam combining structure is not limited to this embodiment, and when there is a difference in light source of projection display, the type of the light source generator can be flexibly adjusted according to the difference in light source property.

Further, the plurality of LD lasers 380 of the present embodiment is four, and specifically includes a red light source laser 382, a green light source laser 384, a blue light source laser 386, and an infrared light source laser 388. It should be noted that, in this embodiment, the red light source laser 382, the green light source laser 384, the blue light source laser 386, and the infrared light source laser 388 are arranged in a manner that: the red light working distance is less than the green light working distance, the green light working distance is less than the blue light working distance, and the blue light working distance is less than the infrared light working distance; here, the working distance refers to an optical path distance between each of the collimating lenses 260 and the focusing lens 250. It should be emphasized that the reason why the four LD lasers 380 are set with the above-mentioned optical path working distances is that, in general, the red light has a larger influence on the projection brightness, so that the red light working distance is minimized, which is beneficial to reducing the combined beam loss of the red light, thereby being beneficial to improving the final projection brightness and improving the projection effect. Of course, in the other embodiments of the present invention, not limited to the setting mode of this LD laser 380 of this embodiment, but also according to the actual requirement of the display effect, the smaller the working distance of the optical path is, the smaller the combined beam loss of the light is, so that the smaller the influence on the corresponding display effect is, and the smaller the working distance is, the smaller the influence on the coupling efficiency of the light after the stress release is, the adjustment principle is the adjustment principle, the working distance of the corresponding optical path of the LD laser 380 with different light sources is flexibly adjusted, thereby satisfying the actual requirement of the display effect.

The working principle of the light source combining structure 300 provided by this embodiment is as follows: the four LD lasers 380 work to emit laser light correspondingly, the laser light passes through the collimating lens 260 to be collimated, then enters the corresponding optical filter 130 through the positioning cavity 140, and is reflected out at a reflection angle of 45 degrees with the optical filter 130, wherein the reflected red light directly enters the focusing lens 250 from the main optical axis of the focusing lens 250, the reflected green light passes through the optical filter 130 corresponding to the red light and enters the focusing lens 250, the blue light sequentially passes through the optical filter 130 corresponding to the green light and the optical filter 130 corresponding to the red light and then enters the focusing lens 250, and the infrared light sequentially passes through the optical filter 130 corresponding to the blue light, the optical filter 130 corresponding to the green light and the optical filter 130 corresponding to the red light and then enters the focusing lens 250, so that the final red light, green light, blue light and infrared light are combined and output at the focusing lens 250.

Referring to fig. 4 to fig. 6, the present embodiment further provides a light source module 30, which includes the light source combining structure 300 and an optical fiber 301 provided in the present embodiment, the optical fiber 301 and the focusing lens 250 constitute a focusing assembly, and the optical fiber 301 is fixed at the beam combining light source output end of the focusing lens 250. The light source combined by the light source combining structure 300 is output from the focusing lens 250 to the optical fiber 301, and then the light source is transmitted from the optical fiber 301 to other scanning devices, such as an optical fiber scanner, so that the final projection display can be realized.

To sum up, the embodiment of the utility model provides a light source closes and restraints structure is through setting up a plurality of location chambeies in running through the passageway, and set up the notch on the location plane in location chamber, make the light filter carry out more accurate and swift when plane location is fixed and the angle is confirmed on the location plane, through setting up spacing face and keep spaced space transition face with the light filter tip, make the light filter can fix a position more rapidly in the plane, also make assembly space of light filter more abundant simultaneously, the assembly degree of difficulty has been reduced, the fixed efficiency of light filter and the precision on the three-dimensional space have further been 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 (9)

1. A light source beam combining structure, comprising:

the light source beam combining device comprises a shell, a light source and a light source, wherein a through channel for providing a working space for light source beam combining is arranged in the shell, and a plurality of positioning cavities are formed in the inner wall of the through channel at intervals along the length direction;

the optical filters correspond to the positioning cavities one by one, and part of the surface of each optical filter is fixed on the side wall corresponding to the positioning cavity, so that the reflection light paths of the optical filters are overlapped when the optical filters carry out light source beam combination;

the side wall of the positioning cavity is a positioning plane, the side wall of the positioning cavity adjacent to the positioning plane is a limiting surface and a space transition surface respectively, and a notch is arranged at an intersection angle of the positioning plane and the limiting surface and is positioned on the positioning plane; the two opposite ends of the optical filter respectively prop against the limiting surface and keep an interval with the space transition surface.

2. The light source beam combining structure according to claim 1, wherein the limiting surface is perpendicular to the positioning plane, and the space transition surface forms an obtuse angle with the positioning plane.

3. The light source beam combining structure of claim 2, further comprising a focusing lens, wherein the focusing lens is fixedly connected to one end of the housing corresponding to the through channel, and a main optical axis of the focusing lens coincides with the reflection optical path corresponding to each of the optical filters.

4. The light source beam combining structure according to claim 3, wherein each of the filters and the focusing lens is fixed in the housing by bonding; the main optical axis of the focusing lens forms an included angle of 45 degrees with the surface of each optical filter.

5. The light source beam combining structure according to claim 3 or 4, further comprising a plurality of collimating lenses, wherein the plurality of collimating lenses are fixed in the housing and correspond to the plurality of optical filters one by one, a main optical axis of each collimating lens and a main optical axis of the focusing lens perpendicularly intersect at the same point on the corresponding optical filter, and the focusing lens and each collimating lens are located at the same side of the corresponding optical filter.

6. The light source beam combining structure according to claim 5, wherein the cavity structures of the plurality of positioning cavities are the same and are arranged at equal intervals in sequence along the length direction of the through channel; the space of each positioning cavity close to the corresponding collimating lens is a transition space; the limiting surface is far away from the corresponding transition space, and one side wall corresponding to the transition space corresponds to the space transition surface.

7. The light source beam combining structure of claim 5, further comprising a plurality of LD lasers for providing monochromatic laser light to the corresponding collimating lenses, wherein the plurality of LD lasers are fixed to the housing and are adapted to the corresponding collimating lenses.

8. The light source beam combining structure according to claim 7, wherein the plurality of LD lasers include a red light source laser, a green light source laser, a blue light source laser and an infrared light source laser, and the red light source laser, the green light source laser, the blue light source laser and the infrared light source laser are arranged in a manner that: the red light working distance is less than the green light working distance, the green light working distance is less than the blue light working distance, and the blue light working distance is less than the infrared light working distance; the working distance refers to an optical path distance between each collimating lens and the focusing lens.

9. A light source module, comprising the light source beam combining structure of claim 7 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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