CN114442410A

CN114442410A - Light source assembly

Info

Publication number: CN114442410A
Application number: CN202011226106.5A
Authority: CN
Inventors: 赵鹏; 吴超; 余新; 廖英岚; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2020-11-05
Filing date: 2020-11-05
Publication date: 2022-05-06
Also published as: WO2022095760A1

Abstract

The invention discloses a light source assembly, which comprises a light source array and a shaping controller, wherein the light source array comprises a plurality of light sources, and the light sources are used for emitting laser; the shaping controller is arranged on a light path of the laser and comprises a plurality of shaping control units, the shaping control units are used for shaping the laser emitted by the light source array, and the shape of the shaping control units is consistent with that of the light source array, so that the laser emitted by the same position of the light source is shaped by the shaping control units to form a plurality of first light spots which are uniformly distributed on a first preset plane, and the first light spots form a first illumination area with uniform brightness. Through the mode, the light source assembly provided by the invention can provide an illumination area with uniform brightness.

Description

Light source assembly

Technical Field

The invention relates to the field of semiconductor laser, in particular to a light source component.

Background

The laser light source is widely applied to the field of illumination and orthographic projection, the existing laser light source generally comprises a plurality of sub light sources, light spots formed by the plurality of sub light sources on the same projection plane generally have overlapping areas, and due to the fact that the brightness has certain superposition, the brightness of the overlapping areas is far larger than the peripheral brightness, and then the brightness of the light spots formed by the whole laser light source on the same projection plane is uneven.

Disclosure of Invention

The invention provides a light source assembly, which aims to solve the problem that in the prior art, light spots formed by laser light sources on the same transmission plane have uneven brightness.

In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a light source assembly comprising: a light source array including a plurality of light sources for emitting laser light; the shaping controller is arranged on a light path of the laser and comprises a plurality of shaping control units for shaping the laser emitted by the light source array, the shape of the shaping control units is consistent with that of the light source array, so that the laser emitted from the same position of the light source is shaped by the shaping control units to form a plurality of first light spots uniformly distributed on a first preset plane, and the first light spots together form a first illumination area with uniform brightness

According to an embodiment of the invention, the plurality of first light spots are spliced or overlapped with each other to form a first illumination area with uniform brightness.

According to an embodiment of the present invention, after controlling the surface distribution of the light source, the duty ratio of the surface distribution of the light source in the light source array, and the principal ray direction of the light source to obtain a uniform first illumination area, the brightness distribution of the light source and the size of the overlapping area of the plurality of first light spots are adjusted.

According to an embodiment of the present invention, the size of the light source in the light source array and the spacing between the plurality of light sources are adjusted to adjust the duty ratio of the area distribution of the light source in the light source array.

According to an embodiment of the present invention, the light source module further includes a first lens array disposed between the light source array and the shaping controller, the first lens array includes a plurality of first lenses corresponding to the plurality of light sources, and the first lenses are configured to adjust a direction of a chief ray of the light source and adjust a duty ratio of a surface distribution of laser light emitted from the light source array after passing through the first lens array.

According to an embodiment of the present invention, the light source assembly further includes a second lens array disposed in the exit direction of the shaping controller, the second lens array includes a plurality of second lenses corresponding to the plurality of light sources, the second lenses are configured to convert the angular distribution of the light spots emitted from the shaping controller into a surface distribution, and form a plurality of second light spots uniformly arranged on a second predetermined plane, and the plurality of second light spots form a second illumination area with uniform brightness.

According to an embodiment of the present invention, the light source module further includes a third lens array disposed in an exit direction of the second lens array, the third lens array includes a plurality of third lenses corresponding to the plurality of second lenses, and focal lengths of the second lenses and the third lenses are different, so as to adjust a principal ray direction of the light source.

According to an embodiment of the present invention, the shaping control unit has a triangular, rectangular or hexagonal shape.

According to an embodiment of the present invention, the shaping control unit is a compound eye.

To solve the above technical problem, another embodiment of the present invention is: providing a projection system comprising a light source assembly as described in any of the above; spatial light modulation means for receiving and modulating the light beam from the light source assembly.

Has the advantages that: different from the prior art, the laser beam shaping device is provided with the shaping controller on the light path of the laser beam emitted by the light source array, and the shaping control unit in the shaping controller is used for independently shaping the angular distribution of the laser beam emitted by the light source array, so that a plurality of first light spots which are consistent can be formed on a first preset plane by the laser beam which is subjected to the angular distribution shaping, and the first light spots are overlapped or spliced with one another. The brightness of the first illumination area formed by the plurality of first light spots can be uniformly distributed, and a large fluctuation phenomenon can not occur.

Drawings

FIG. 1 is a schematic side view of a first embodiment of a light source module according to the present invention;

FIG. 2 is a schematic top view of a first embodiment of a first light spot projected onto a first predetermined plane by the light source module shown in FIG. 1;

FIG. 3 is a schematic side view of a second embodiment of a light source module according to the present invention;

FIG. 4 is a schematic top view of a first embodiment of the first light spot projected onto a first predetermined plane by the light source module shown in FIG. 3;

FIG. 5 is a schematic top view of a second embodiment of the first light spot projected onto a first predetermined plane by the light source module shown in FIG. 3;

FIG. 6 is a schematic side view of a third embodiment of a light source module according to the present invention;

FIG. 7 is a schematic depiction of duty cycle in a light source assembly provided by the present invention;

FIG. 8 is a schematic side view of a fourth embodiment of a light source module according to the present invention;

FIG. 9 is a schematic side view of a fifth embodiment of a light source module according to the present invention;

fig. 10 is a schematic side view illustrating a sixth embodiment of a light source module according to the present invention.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1-10 together, the present invention provides a light source assembly 10, wherein the light source assembly 10 includes a light source array 100 and a graphic controller 200. The light source array 100 includes a plurality of light sources 110, and the plurality of light sources 110 are arranged in a shape array. The light source 110 may be used to emit laser light. The shaping controller 200 includes a plurality of shaping control units 210, the plurality of shaping control units 210 correspond to the plurality of light sources 110, optionally, one shaping control unit 210 corresponds to the plurality of light sources 110, or one shaping control unit 210 corresponding to each light source 110 exists for each light source 110, which is not limited herein. Optionally, the shaping control unit 210 is configured to shape the laser light emitted by the light source 110.

In an alternative embodiment, the shape of the shaping control unit 210 is consistent with the shape of the light source array 100, so that the laser light emitted by the light sources 110 at the same position is shaped by the shaping control unit 210 to form a plurality of first light spots 310 uniformly arranged on the first preset plane 300, and the plurality of first light spots 310 can form the first illumination area 320 with uniform brightness, and specifically, the plurality of first light spots 310 can be spliced or overlapped to form the first illumination area 320 with uniform brightness.

It should be noted that, the same position of the light source refers to the same edge position or middle position of the plurality of light sources, and all the light rays in the drawings in this specification only show the light ray direction of the same edge position of the plurality of light sources, so as to facilitate understanding, those skilled in the art can know that, since the whole illumination light spot formed by the same positions of the plurality of light sources is uniform, the superposition of the light spots emitted from all the positions of the plurality of light sources is necessarily uniform.

Optionally, the shape of the shaping control unit 210 may be consistent with the shape of the light source array 100, specifically, the projection of the shaping control unit 210 on the first preset plane 300 is consistent, specifically, the shapes may be the same, that is, the projection outlines and sizes of the shaping control unit 210 and the light source array 100 are the same, or may be similar, that is, the projection outlines of the shaping control unit 210 and the light source array 100 are similar, but the sizes are different.

It should be noted that the consistency mentioned in the present application may be the same or similar, where the same does not necessarily have to be the same, and the difference between the two may be within a certain error range, such as an unavoidable error range.

In alternative embodiments, the light source 110 may be embodied as a laser, an LED, or an optical coupler, among others.

In an alternative embodiment, a plurality of uniform first light spots 310 are formed in the first predetermined plane 300, that is, the plurality of first light spots 310 are similar or identical, and the same can satisfy a certain error range, and the plurality of first light spots 310 are combined to form the first illumination area 320.

The first light spot 310 is in accordance with the shape of the light source array 100, that is, the projection of the light source array 100 on the first preset plane 300 is in accordance with the shape of the first light spot 310, specifically, the shape may be the same, that is, the projection outlines and the sizes of the first light spot 310 and the light source array 100 are the same, or the shapes may be similar, that is, the projection outlines of the first light spot 310 and the light source array 100 are similar patterns, but the sizes are different.

As shown in fig. 6, taking two light sources 110 as an example, after the laser light of the two light sources 110 passes through the shaping control unit 210, two first light spots 310 are formed on the first predetermined plane 300, wherein the two first light spots 310 are identical in shape and size, and are completely overlapped on the first predetermined plane 300, since the brightness of the two first light spots 310 is uniformly distributed as a whole, that is, under the control of the shaping control unit 210, the laser light emitted by the light source 100 after forming the first light spot 310 is not distributed in a gaussian manner, but is uniformly distributed, that is, the brightness from the center of the light spot to the periphery is uniform, and the change is little or no change.

Take various scenarios as examples:

as shown in fig. 1 and fig. 2, the edges of the plurality of first light spots 310 are spliced with each other to form a more distributed light spot, i.e. to form the first illumination area 320, and since the brightness of each first light spot 310 in the first illumination area 320 is uniform, the first illumination area 320 is also uniform.

As shown in fig. 3 and 4, the plurality of first light spots 310 have a certain overlapping area, for example, at least three first light spots 310 are distributed along the first direction, and taking the perspective of fig. 4 as an example, the first light spots 310 on both sides along the first direction overlap with the first light spot 310 in the middle, and the areas of the overlapping areas are the same, so that the intensities of the overlapping areas of the first light spot 310 on the left and the first light spot 310 in the middle are the same as the intensities of the overlapping areas of the first light spot 310 on the right and the first light spot 310 in the middle. The brightness of the whole first illumination area 320 is made uniform, wherein the brightness uniformity can be uniformly distributed in the whole, and the whole uniformity does not mean that the brightness of the whole first illumination area 320 is the same everywhere, but includes an illumination central area (overlapping area) with uniform and high brightness and an illumination edge area (non-overlapping area) with gradually-changed and low brightness. Alternatively, the first illumination area 320 may be cut or truncated by other optical devices, that is, a central illumination area with uniform brightness in the middle is cut, so as to obtain illumination light with uniform brightness in a preset plane.

As shown in fig. 5, the number of the first light spots 310 may be at least five, that is, the first light spots may overlap along a first direction and a second direction perpendicular to the first direction. Similarly, the four surrounding first light spots 310 all have an overlapping area with the middle first light spot 310, and the brightness of the overlapping areas is uniform, so that the brightness of the first illumination area 320 formed by the plurality of first light spots 310 is uniform as a whole.

In other embodiments, as shown in fig. 6, in the limit, the plurality of first light spots 310 may be completely overlapped, i.e. a first illumination area 320 identical to the first light spot 310 is formed. Since the brightness of the plurality of first light spots 310 is uniform per se, the brightness of the first illumination area 320 is also uniform.

In the above embodiment, the shaping controller 200 is disposed on the optical path of the laser light emitted from the light source array 100, and the shaping control unit 210 in the shaping controller 200 is used to perform independent angular distribution shaping on the laser light emitted from the light source 110 of the light source array 100, so that the plurality of laser lights shaped by angular distribution can form a plurality of uniform first light spots 310 on the first preset plane 300 to be overlapped or spliced, and the brightness of the first illumination area 320 formed by the plurality of first light spots 310 can be uniformly distributed without generating a large fluctuation phenomenon. Therefore, in the case of a plurality of light sources 110, it is still ensured that the brightness of the first illumination area 320 formed on the first predetermined plane 300 is uniform.

In a specific embodiment, after the uniform first illumination area 320 can be obtained by controlling the surface distribution of the light sources 110, the duty ratio of the surface distribution of the light sources 110 in the light source array 100, and the direction of the principal ray of the light sources 110, the method can also be used to adjust the brightness distribution of the light sources 110 and the size of the overlapping area of the plurality of first light spots 310.

As shown in fig. 7, the surface distribution is specifically the surface distribution of the light source 110, and the light spot is formed by the laser light emitted from the light emitting position in the light source 110. The duty ratio of the surface distribution of the light sources 110 is a ratio of a short axis length D of the surface distribution of the light sources 110 to a distance L between a light emitting position of one light source 110 and a light emitting position of the light source 110 adjacent to the light source 110 in the short axis direction, and may be referred to as D/L.

In an optional scenario, by adjusting the duty ratio of the surface distribution of the light sources 110, the principal ray direction of the laser light emitted by the light sources 110, the angular distribution of the laser light, and the like, the adjustment of the brightness distribution of the first light spot 310 formed by the light sources 110 and the adjustment of the overlapping condition of the plurality of first light spots 310 formed by the plurality of light sources 110 can be achieved.

In an alternative embodiment, by adjusting the size 110 of the light sources in the light source array 100 and the distance between the plurality of light sources 110, the duty ratio of the surface distribution of the light sources 110 in the light source array 100 can be adjusted, and the overlapping size of the first light spots can also be adjusted, so that uniform illumination light can be obtained on different preset planes, and different application scenes can be met.

As shown in fig. 8, the light source assembly 10 may further include a first lens array 400 disposed between the light source array 100 and the graphic controller 200, the first lens array 400 including a plurality of first lenses 410 corresponding to the plurality of light sources 110, the first lenses 410 being used to adjust a principal ray direction of the laser light. Optionally, a plurality of light sources 110 may correspond to one first lens 410, or each light source 110 may correspond to one first lens 410, and the first lens 410 may control a principal ray direction of the laser light emitted by the corresponding light source 110, so that the adjusted laser light may be better incident into the shaping control unit 210 and perform the angular distribution shaping.

In other embodiments, the surface distribution of the laser light emitted by the light source array 100 after passing through the first lens array 400 can be adjusted in the duty cycle of the light source array 100 and the principal ray direction of the laser light by the first lens array 410, so that the brightness distribution and the overlapping size of the plurality of first light spots 310 can also be adjusted, and of course, the manner of adjusting the duty cycle of the light source array, which is well known to those skilled in the art, is within the scope of the claimed invention.

In an alternative embodiment, the shaping control unit 210 may specifically be a compound eye.

In an alternative embodiment, the orthographic projection of the light source array 100 on the first preset plane 300 is arranged in a first preset shape, the orthographic projection of the shaping control unit 210 on the first preset plane is similar to the first preset shape in a figure, and the shaping control unit 210 performs angular distribution shaping on the laser light so that the first light spot 310 formed by the laser light subjected to angular distribution shaping on the first preset plane 300 is in a second preset shape similar to the first preset shape.

In an alternative embodiment, the plurality of light sources 110 of the light source array 100 may be arranged in a rectangular shape as a whole, and the first preset shape of the light source array 100 on the first preset plane 300 is a rectangle, so that the orthographic projection of the shaping control unit 210 on the first preset plane 300 may also be a rectangle, and further, the shaping control unit 210 shapes the angular distribution of the laser light so that the first light spot 310 formed on the first preset plane 300 by the laser light shaped by the angular distribution may also be a rectangle.

In another alternative embodiment, the plurality of light sources 110 of the light source array 100 may be arranged in a hexagonal shape as a whole, the first preset shape of the light source array 100 on the first preset plane 300 is a hexagonal shape, the orthographic projection of the shaping control unit 210 on the first preset plane 300 may also be a hexagonal shape similar to the first preset shape, and further, the shaping control unit 210 shapes the angular distribution of the laser light so that the first light spot 310 formed on the first preset plane 300 by the laser light shaped by the angular distribution may also be a hexagonal shape. It will be appreciated that other patterns, such as triangles, which can be symmetrically tiled, may also achieve uniform tiling of the spots.

Optionally, since the orthographic projection of the shaping control unit 210 on the first preset plane 300 is similar to the first preset shape of the light source array 100 on the first preset plane 300, the second preset shape of the first light spot 310 formed on the first preset plane 300 by the laser light shaped by the angular distribution can be similar to the first preset shape. So that the overlapping area of the plurality of first light spots 310 can be better controlled.

In an alternative embodiment, the second preset shape is identical to the first preset shape in size, that is, the size of the plurality of first light spots 310 formed on the first preset plane 300 is identical to the plane size of the light source array 100.

In another embodiment, the second predetermined shape is twice the first predetermined shape, so that the overlapping area of the plurality of first light spots 310 can be effectively increased. Thereby further improving the uniformity of the luminance.

In other embodiments, the second predetermined shape is a predetermined multiple of the first predetermined shape, such as 0.5 times, 3 times, or 4 times, etc., which are not limited herein.

As shown in fig. 9, the light source module 10 further includes a second lens array 500 disposed on the optical path of the distribution-shaped laser light, where the second lens array 500 includes a plurality of second lenses 510 corresponding to the plurality of shaping control units 210, optionally a plurality of shaping control units 210 corresponds to one second lens 510, or every other shaping control unit 210 corresponds to one second lens 510, and the second lenses 510 are configured to perform surface distribution conversion on the angular distribution-shaped laser light, so that the surface distribution-converted laser light forms a plurality of uniform second light spots 610 on a second preset plane 600, and the plurality of second light spots 610 are combined to form a second illumination area with uniform brightness.

Similarly, the light source module 10 may further provide a second lens array 500 for converting the angular distribution into a plane distribution, each second lens 510 in the second lens array 500 has only one shaping control unit 210, and the laser light output by the corresponding shaping control unit 210 and shaped by the angular distribution may be subjected to the plane distribution conversion, so that the laser light after the plane distribution conversion forms a plurality of uniform second light spots 610 on the second preset plane 600, and the plurality of uniform second light spots 610 are overlapped or spliced with each other, so that a second illumination area with uniform brightness may be formed.

As shown in fig. 10, the light source assembly 10 further includes a third lens array 700 disposed in the emergent direction of the second lens array 500, the third lens array 700 includes a plurality of third lenses 710 corresponding to the plurality of second lenses 510, the focal lengths of the second lenses 510 and the third lenses 710 are different, so that the direction of the principal ray of the light source 110 can be adjusted, and since the principal axis of the laser is not changed, the telecentricity of the laser of the light source 110 (included angle information between the principal ray and the principal axis) can be adjusted by adjusting the principal ray of the laser of the light source 110.

Similar to the angular distribution, the second light spot 610 formed on the second predetermined plane 600 by the laser light subjected to the surface distribution conversion is a third predetermined shape, and the third predetermined shape is also a similar pattern to the first predetermined shape, and optionally, if the first predetermined shape is a rectangle, the third predetermined shape is also a rectangle similar to the first predetermined shape, and if the first predetermined shape is a hexagon, the third predetermined shape is also a hexagon similar to the first predetermined shape.

The present application further provides a projection system, which includes the light source assembly 10 in any of the above embodiments, and the projection system further includes a spatial light modulation device, the spatial light modulation device is specifically disposed on the light path of the light beam of the light source assembly 10, and can modulate the light beam, specifically, the partial region brightness of the light source assembly 10 is intercepted to achieve the light beam with good uniformity, and the like.

In summary, the present invention provides a light source assembly 10, wherein a shaping controller 200 is disposed on an optical path of laser light emitted from a light source array 100, and a shaping control unit 210 in the shaping controller 200 is used to perform independent angular distribution shaping on the laser light emitted from a light source 110 of the light source array 100, so that a plurality of angularly distributed and shaped laser light can form a plurality of uniform first light spots 310 on a first preset plane 300, and the plurality of first light spots 310 are overlapped or spliced with each other. The brightness of the first illumination area 320 formed by the plurality of first light spots 310 can be uniformly distributed without generating large fluctuation. Further, the second lens array 500 is further arranged to perform surface distribution conversion on the laser light subjected to angular distribution shaping, so that the laser light subjected to surface distribution conversion forms a plurality of uniform second light spots 610 on the second preset plane 600, and the plurality of uniform second light spots 610 are overlapped or spliced with each other. The brightness of the second illumination area formed by the plurality of second light spots 610 can be uniformly distributed, and a large fluctuation phenomenon does not occur.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent results or equivalent flow transformations performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A light source assembly, characterized in that it comprises:

a light source array including a plurality of light sources for emitting laser light;

the shaping controller is arranged on a light path of the laser and comprises a plurality of shaping control units, the shaping control units are used for shaping the laser emitted by the light source array, the shape of the shaping control units is consistent with that of the light source array, so that the laser emitted by the same position of the light source is shaped by the shaping control units to form a plurality of first light spots which are uniformly distributed on a first preset plane, and the first light spots together form a first illumination area with uniform brightness.

2. The light source module according to claim 1, wherein the plurality of first light spots are spliced or superimposed to each other to form the first illumination region of uniform brightness.

3. The light source module as claimed in claim 1, wherein the area distribution of the light sources, the duty ratio of the area distribution of the light sources in the light source array, and the principal ray direction of the light sources are controlled to obtain a uniform first illumination area, and then the brightness distribution of the light sources and the size of the overlapping area of the plurality of first light spots are adjusted.

4. The light source assembly of claim 3, wherein the size of the light sources in the array of light sources and the spacing between a plurality of the light sources are adjusted to adjust the duty cycle of the area distribution of the light sources across the array of light sources.

5. The light source assembly of claim 3, further comprising a first lens array disposed between the light source array and the shaping controller, wherein the first lens array includes a plurality of first lenses corresponding to the plurality of light sources, and the first lenses are configured to adjust a direction of a principal ray of the light sources and a duty ratio of a surface distribution of laser light emitted from the light source array after passing through the first lens array.

6. The light source assembly of claims 1-5, further comprising a second lens array disposed in the exit direction of the shaping controller, wherein the second lens array comprises a plurality of second lenses corresponding to the plurality of light sources, the second lenses are configured to convert the angular distribution of the light spots emitted from the shaping controller into a surface distribution, and form a plurality of second light spots uniformly arranged on a second predetermined plane, and the second light spots form a second illumination area with uniform brightness.

7. The light source module as recited in claim 8, further comprising a third lens array disposed in an exit direction of the second lens array, wherein the third lens array includes a plurality of third lenses corresponding to the plurality of second lenses, and focal lengths of the second lenses and the third lenses are different for adjusting a chief ray direction of the light source.

8. The light source assembly according to claim 1, wherein the shaping control unit has a shape of a triangle, a rectangle, or a hexagon.

9. The light source assembly of claim 1, wherein the shaping controller is a compound eye.

10. A projection system, comprising: light source assembly according to claims 1-9;

spatial light modulation means for receiving and modulating the light beam from the light source assembly.