Pattern projection apparatus

Abstract

The embodiment of the utility model provides pattern projection equipment, which comprises a light source mounting plate, a collimation light source assembly, a micro-lens array and a controller, a plurality of light sources arranged at intervals are arranged on the light source mounting plate, and each light source forms an independent sub-light-emitting area through a first partition plate of the adjacent light sources; a second partition plate is arranged between every two adjacent collimation light source assemblies, one end of each second partition plate is connected with the corresponding first partition plate, and the first partition plates and the second partition plates are collinear so that the collimation light source assemblies can correspond to the sub-light-emitting areas one to one. Each sub-pattern area of the micro-pattern layer comprises a plurality of micro-patterns, and the micro-patterns of the sub-pattern areas are different; the sub-pattern areas are in one-to-one correspondence with the sub-light-emitting areas through the collimation light source assemblies; the other end of the second partition plate abuts against the side, close to the light source, of the microlens array so that light rays of the same light source can be collimated through the corresponding collimation light source assembly and then enter the sub-pattern area corresponding to the light source. And the controller is electrically connected with the plurality of light sources.

Description

Technical Field

[0001] The present application relates to the field of pattern display technology, and in particular to a pattern projection device. Background Art

[0002] With the development of digital technology, today's society has entered the multimedia era. In the multimedia era, pattern projection has been widely used in all aspects of life. For example, pattern projection is not only used in daily car distance warnings, car interactive instructions, cinema instructions, welcoming guests and other instruction and guidance scenes, but is also often used in scenes such as city night scene layout to enhance visual experience.

[0003] Currently, dynamic pattern projection equipment can realize dynamic projection of different patterns. However, during the projection process, it is easy to have the problem of stray light of other patterns appearing when projecting the pattern. Utility Model Content

[0004] The purpose of the embodiment of the present application is to provide a pattern projection device to solve the problem of stray light that is prone to occur during dynamic projection. The specific technical solution is as follows:

[0005] The pattern projection device provided by the embodiment of the present application includes a light source mounting plate arranged in sequence along the optical axis, a plurality of collimated light source assemblies opposite to the plurality of light sources, a microlens array and a controller, wherein the light source mounting plate is provided with a plurality of light sources arranged at intervals, and a first partition is provided between adjacent light sources so that each of the light sources forms an independent sub-light-emitting area; the collimated light source assembly is configured to generate parallel incident light from the light source; a second partition is provided between adjacent collimated light source assemblies, one end of the second partition is connected to the first partition, and the first partition and the second partition are collinear so that the collimated light source assembly corresponds to the sub-light-emitting area one by one; the microlens array includes a micropattern layer and a first microlens array and a second microlens array arranged in parallel with each other; the first microlens array is provided between the collimated light source assembly and the second microlens array, The micro-pattern layer is located on a side of the first micro-lens array close to or far from the collimated light source assembly; the micro-pattern layer includes a plurality of sub-pattern areas, each of which includes a plurality of micro-patterns, and the micro-patterns of each sub-pattern area are different; the sub-pattern areas are opposite to the sub-light-emitting areas one by one through the collimated light source assembly; the other end of the second partition plate abuts against a side of the micro-lens array close to the light source, so that the light of the same light source is collimated by the corresponding collimated light source assembly and then incident into the sub-pattern area corresponding to the light source; the first micro-lens array and the second micro-lens array both include a plurality of sub-lenses; the micro-patterns are arranged in a one-to-one correspondence with the sub-lenses, and the micro-patterns in each sub-pattern area overlap at the same position after being imaged by the corresponding sub-lenses; the controller is electrically connected to the plurality of light sources.

[0006] In addition, the pattern projection device according to the embodiment of the present application may also have the following technical features:

[0007] In some embodiments, the area of ​​each of the sub-light-emitting regions is equal.

[0008] In some embodiments, the number of the light sources is four, and the four light sources are evenly and symmetrically arranged on the light source mounting plate.

[0009] In some embodiments, the light sources are distributed symmetrically on the center of the light source mounting plate, or are evenly distributed in a first direction.

[0010] In some embodiments, the light colors or light brightness of the multiple light sources are different.

[0011] In some embodiments, the pattern projection device further includes: a housing for accommodating the light source mounting plate, the plurality of collimated light source assemblies and the microlens array; a connecting frame is provided on the housing, and the housing is connected to an external device via the connecting frame.

[0012] In some embodiments, the pattern projection device further includes heat dissipation fins, and the heat dissipation fins are disposed on an outer wall of the housing close to the light source mounting plate.

[0013] In some embodiments, the pattern projection device also includes: a shielding lens barrel connected to the outer shell, the shielding lens barrel is located on the light-emitting side of the outer shell, the inner circumference of the shielding lens barrel is a conical surface, and the inner circumference is opaque; the light collimated by the collimated light source assembly passes through the corresponding sub-lens and then projected as normal light, and the light collimated by the collimated light passes through the adjacent sub-lens of the corresponding sub-lens and then projected as stray light, and the shielding lens barrel is used to shield a secondary image formed by the stray light.

[0014] In some embodiments, a protective lens is provided at one end of the shielding lens barrel away from the housing and forms a preset angle with the optical axis.

[0015] In some embodiments, the sub-lenses in the microlens array are plano-convex, bi-convex or free-form microlenses or Fresnel lenses, diffraction lenses, or super lenses.

[0016] In the embodiment of the present application, the multiple light sources on the light source mounting plate are divided into multiple independent sub-light-emitting areas by the first partition. The setting of the first partition can prevent the light emitted by different light sources from crosstalking with each other in the sub-light-emitting area. The light emitted by each light source will be collimated by the corresponding collimated light source assembly to generate parallel light, and the parallel light corresponding to each light source continues to be incident on the corresponding sub-pattern area, so that different light sources can image the micro-patterns of the corresponding sub-pattern area separately. The first partition and the second partition are connected and collinear, so that the collimated light source assembly corresponds to the sub-light-emitting area one by one, and the other end of the second partition is abutted against the side of the microlens array close to the light source, so that the collimated parallel light of each independent light source can be directly incident on the sub-pattern area corresponding to the light source, preventing the parallel light from entering the sub-pattern area other than the corresponding sub-pattern area, thereby reducing the probability of stray light of other micro-patterns appearing when projecting one of the micro-patterns, thereby improving the user's viewing experience.

[0017] In addition, the microlens array adopts a double-layer microlens array structure, wherein the first microlens array can converge the incident light, and the second microlens array images the micropattern on the microlens source. The edge light of the parallel incident light generated by the collimated light source assembly corresponds to the sub-lens at the edge of the first microlens array, which is close to the optical axis of the edge sub-lens, while the light in the traditional single large lens system is far from the optical axis, so the light in the single large lens system has large distortion and aberration defects when imaging. Therefore, compared with the traditional single large lens system, the pattern projection device provided in the embodiment of the present application can effectively reduce the distortion and aberration of the incident light when imaging; due to the small aperture of the sub-lens, the depth of field of the imaging is large at the same focal length, and the edge projection picture is clearer when the projection is tilted. The micropattern of each sub-pattern area is different, and the controller is electrically connected to multiple light sources, which can control the working state of different light sources, thereby achieving the effect of dynamic projection.

[0018] Of course, any product implementing the present application does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of a pattern projection device provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the structure of a microlens array provided in an embodiment of the present application;

[0022] Figure 3 Another schematic diagram of the structure of the microlens array provided in the embodiment of the present application;

[0023] Figure 4 A schematic diagram of one of the sub-pattern regions of the micro-pattern layer provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of a micro-pattern layer provided in an embodiment of the present application;

[0025] Figure 6 for Figure 5 A schematic diagram of a micro-pattern layer shown;

[0026] Figure 7 A schematic diagram of another micro-pattern layer provided in an embodiment of the present application;

[0027] Figure 8for Figure 7 A schematic diagram of a micro-pattern layer shown;

[0028] Fig. 9 An exploded view of a pattern projection device provided in an embodiment of the present application.

[0029] Reference numerals:

[0030] Light source mounting plate 10; light source 11; optical axis 110; first baffle 12; sub-light emitting area 13; collimated light source assembly 21; second baffle 22; microlens array 30; sub-lens 300; first microlens array 31; second microlens array 32; micropattern layer 33; micropattern 330; complete micropattern 330a; incomplete micropattern 330b; first sub-pattern area 331; first graphic 3311; second sub-pattern area 332; second graphic 3321; third sub-pattern area 333; third graphic 3331; first preset projection Pattern 334; fourth sub-pattern area 335; fourth figure 3351; fifth sub-pattern area 336; fifth figure 3361; sixth sub-pattern area 337; sixth figure 3371; seventh sub-pattern area 338; seventh figure 3381; second preset projection pattern 339; housing 40; connecting frame 41; first assembly hole 42; connecting piece 43; first bracket 44; assembly column 441; second bracket 45; second assembly hole 46; heat dissipation fins 50; shielding barrel 60; inner circumference 61; protective lens 62; projection pattern 70. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field based on this application belong to the scope of protection of the utility model.

[0032] The present application embodiment provides a pattern projection device, such as Figure 1 As shown, the pattern projection device includes a light source mounting plate 10 arranged in sequence along an optical axis 110, a plurality of collimated light source assemblies 21 opposite to the plurality of light sources 11, a microlens array 30 and a controller (not shown), the light source mounting plate 10 is provided with a plurality of light sources 11 arranged at intervals, a first partition 12 is provided between adjacent light sources 11, so that each light source 11 forms an independent sub-light emitting area 13; the collimated light source assembly 21 is configured to generate parallel incident light from the light source 11; a second partition 22 is provided between adjacent collimated light source assemblies 21, one end of the second partition 22 is connected to the first partition 12, and the first partition 12 and the second partition 22 are collinear, so that the collimated light source assembly 21 corresponds to the sub-light emitting area 13 one by one; as shown Figure 1, Figure 2 and Figure 3 As shown, the microlens array 30 includes a micropattern layer 33 and a first microlens array 31 and a second microlens array 32 arranged in parallel with each other; the first microlens array 31 is arranged between the collimated light source assembly 21 and the second microlens array 32, and the micropattern layer 33 is located on a side of the first microlens array 31 close to or away from the collimated light source assembly 21; the micropattern layer 33 includes a plurality of sub-pattern areas, each of which includes a plurality of micropatterns 330, and the micropatterns 330 of each sub-pattern area are different; the sub-pattern areas are opposite to the sub-light emitting areas 13 one by one through the collimated light source assembly 21; the second partition 22 The other end of the microlens array 30 is in contact with a side of the microlens array 30 close to the light source 11, so that the light of the same light source 11 is collimated by the corresponding collimated light source assembly 21 and then incident on the sub-pattern area corresponding to the light source 11; the first microlens array 31 and the second microlens array 32 each include a plurality of sub-lenses 300; the micro-patterns 330 are arranged in a one-to-one correspondence with the sub-lenses 300, and the micro-patterns 330 in each sub-pattern area are overlapped at the same position after being imaged by the corresponding sub-lenses 300; the controller is electrically connected to the plurality of light sources 11 to control different light sources 11 to light up successively at a preset time.

[0033] In the embodiment of the present application, the multiple light sources 11 on the light source mounting plate 10 are divided into multiple independent sub-light-emitting areas 13 by the first partition 12. The first partition 12 can prevent the light emitted by different light sources 11 from crosstalking with each other in the sub-light-emitting area 13. The light emitted by each light source 11 will be collimated by the corresponding collimated light source assembly 21 to generate parallel light, and the parallel light corresponding to each light source 11 continues to be incident on the corresponding sub-pattern area, so that different light sources 11 can form separate images of the micro-patterns 330 in the corresponding sub-pattern area. The first partition 12 and the second partition 22 are connected and collinear, so that the collimated light source assembly 21 corresponds to the sub-light-emitting area 13 one by one, and the other end of the second partition 22 is abutted against the side of the microlens array 30 close to the light source 11, so that the collimated parallel light of each independent light source 11 can be directly incident on the sub-pattern area corresponding to the light source 11, preventing the parallel light from entering the sub-pattern area other than the corresponding sub-pattern area, thereby reducing the probability of stray light of other micro-patterns 330 appearing when projecting one of the micro-patterns 330, thereby improving the user's viewing experience.

[0034] In addition, if Figure 1 , Figure 2 and Figure 3As shown, the microlens array 30 adopts a double-layer microlens array structure, wherein the first microlens array 31 can converge the incident light, and the second microlens array 32 can image the micropattern 330 on the microlens source. The edge light of the parallel incident light generated by the collimated light source assembly 21 corresponds to the sub-lens 300 at the edge of the first microlens array 31, which is close to the optical axis of the edge sub-lens 300, while the light in the traditional single large lens system is far from the optical axis, so the light in the single large lens system has the defects of large distortion and aberration when imaging. Therefore, compared with the traditional single large lens system, the pattern projection device provided by the embodiment of the present application can effectively reduce the distortion and aberration of the incident light when imaging; due to the small aperture of the sub-lens 300, the depth of field of the imaging is large at the same focal length, and the edge projection picture is clearer when the projection is tilted. The micropattern 330 of each sub-pattern area is different, and the controller is electrically connected to the multiple light sources 11, and can control the light sources 11 to light up successively at a preset time, thereby achieving the effect of dynamic projection.

[0035] Specifically, the controller can control different light sources 11 according to user needs. For example, only one light source 11 can be lit at the same time, that is, only one sub-pattern area in the micro-pattern layer 33 is projected during projection.

[0036] Specifically, the pattern of the micro pattern 330 can be carried by the pattern sheet, and the shape and distribution of the micro pattern 330 can be set according to the actual needs of the user. Figure 5 and Figure 6 As shown, assuming that the number of light sources 11 is three, the number of sub-pattern areas is also three, namely a first sub-pattern area 331, a second sub-pattern area 332 and a third sub-pattern area 333, the micro-pattern 330 in the first sub-pattern area 331 is a first graphic 3311, the micro-pattern 330 in the second sub-pattern area 332 is a second graphic 3321, and the micro-pattern 330 in the third sub-pattern area 333 is a third graphic 3331.

[0037] It should be noted that the first graphic 3311, the second graphic 3321 and the third graphic 3331 can be respectively located at the center of the pattern piece of the corresponding micro-pattern 330. During projection, the controller controls a single light source to light up for a preset time and then controls the light source to turn off, and then repeats the above operation for other light sources, so that the projection area can present different patterns at different times at the same position, thereby realizing dynamic projection of different patterns at the same position.

[0038] In addition, the first graphic 3311, the second graphic 3321 and the third graphic 3331 can be respectively located at different positions of the pattern sheet of the corresponding micro-pattern 330, and arranged sequentially in one direction, so that when the first graphic 3311, the second graphic 3321 and the second graphic 3321 are projected at the same time, the first graphic 3311, the second graphic 3321 and the third graphic 3331 form a complete pattern, that is, the first graphic 3311, the second graphic 3321 and the second graphic 3321 together form a first preset projection pattern 334. During projection, the controller controls each light source to light up in sequence according to a preset time, so that the first graphic 3311, the second graphic 3321 and the third graphic 3331 can light up in sequence in the projection area, thereby realizing that different parts of the first preset projection pattern 334 are lit up in sequence, and refreshing dynamic projection is realized.

[0039] like Figure 7 and Figure 8 As shown, the number of sub-pattern areas may also be four, and the four sub-pattern areas are arranged in a square array, namely a fourth sub-pattern area 335, a fifth sub-pattern area 336, a sixth sub-pattern area 337 and a seventh sub-pattern area 338. The micro-pattern 330 in the fourth sub-pattern area 335 is a fourth figure 3351, the micro-pattern 330 in the fifth sub-pattern area 336 is a fifth figure 3361, the micro-pattern 330 in the sixth sub-pattern area 337 is a sixth figure 3371, and the micro-pattern 330 in the seventh sub-pattern area 338 is a seventh figure 3381.

[0040] The fourth graphic 3351, the fifth graphic 3361, the sixth graphic 3371, and the seventh graphic 3381 can be respectively located at different positions of the pattern sheet of the corresponding micro-pattern 330, so that when the fourth graphic 3351, the fifth graphic 3361, the sixth graphic 3371, and the seventh graphic 3381 are processed simultaneously, the fourth graphic 3351, the fifth graphic 3361, the sixth graphic 3371, and the seventh graphic 3381 form a complete pattern, that is, the fourth graphic 3351, the fifth graphic 3361, the sixth graphic 3371, and the seventh graphic 3381 together form the second preset projection pattern 339. During projection, the controller controls each light source to light up in sequence according to the preset time, so that the fourth graphic 3351, the fifth graphic 3361, the sixth graphic 3371, and the seventh graphic 3381 can light up in sequence in the projection area, thereby realizing that different parts of the second preset projection pattern 339 are lit up in sequence, and dynamic projection is realized.

[0041] Among them, the order of lighting the light sources can be controlled according to different needs. For example, in an embodiment of the present application, other light sources can be lit in sequence from the light source corresponding to the fourth sub-pattern area 335 in a clockwise direction, so that the projection area forms a circular cyclic dynamic effect.

[0042] It should be noted that the present application does not limit the number and pattern of sub-pattern areas. For example, the number of sub-pattern areas can also be five, six or more.

[0043] Specifically, the light source 11 may be an LED light source or a laser light source. Both LED light sources and laser light sources are solid-state light sources, which have a slow decay rate and a long life compared to traditional light bulb light sources. Compared to LED light sources, laser light sources may have higher collimation, which may reduce the complexity of the collimated light source assembly 21.

[0044] The first partition plate 12 and the second partition plate 22 may be connected by bonding.

[0045] In some embodiments of the present application, the areas of each sub-light-emitting region 13 are equal.

[0046] In the embodiment of the present application, the area of ​​each sub-light-emitting area 13 is equal, so the light passing through each sub-pattern area is roughly equal, which can make the brightness of different patterns projected on the projection area roughly equal, thereby improving the viewing experience of dynamic projection.

[0047] In some embodiments of the present application, the number of light sources 11 is four, and the four light sources 11 are evenly and symmetrically arranged on the light source mounting plate 10, which can better achieve uniform brightness of the projection pattern and has a simple structure. In the embodiment of the present application, the light sources 11 are evenly and symmetrically distributed on the light source mounting plate 10, and each sub-light emitting area 13 and sub-pattern area 13 are also symmetrically and evenly distributed.

[0048] In some embodiments of the present application, the light sources 11 are centrally symmetrically distributed on the light source mounting plate 10, or uniformly distributed in the first direction. In the embodiments of the present application, the centrally symmetrical distribution of the light sources 11 on the light source mounting plate 10 can make the force on the light source mounting plate 10 more uniform, and can also make the brightness of different projection patterns 70 more uniform. Specifically, the first direction can be a vertical direction, a horizontal direction, or an arbitrary direction.

[0049] In some embodiments of the present application, the light colors or light brightness of the multiple light sources 11 are different.

[0050] In the embodiment of the present application, the user can select a light source 11 that can emit different colors according to actual needs, thereby increasing the diversity of the display of the dynamic projection pattern 70 and further improving the user's viewing experience.

[0051] In some embodiments of the present application, the pattern projection device also includes a housing 40 for accommodating a light source mounting plate 10, a plurality of collimated light source assemblies 21 and a microlens array 30; a connecting frame 41 is provided on the housing 40, and the housing 40 is connected to an external device (not shown) via the connecting frame 41.

[0052] In the embodiment of the present application, the outer shell 40 contains a light source 11, a collimated light source assembly 21 and a microlens array 30. Compared with other components of the pattern projection device, the outer shell 40 contains more optical elements and is therefore heavier. Therefore, connecting the outer shell 40 to an external device via a connecting frame 41 can make the pattern projection device more stable after installation.

[0053] Specifically, Fig. 9 As shown, a first bracket 44 for supporting the first partition plate 12 and a second bracket 45 for supporting the second partition plate 22 are also provided in the housing 40 .

[0054] In some embodiments of the present application, Figure 1 As shown, the pattern projection device further includes a heat dissipation fin 50 , which is disposed on an outer wall of the housing 40 close to the light source mounting plate 10 .

[0055] In the embodiment of the present application, in the embodiment of the present application, during the operation of the pattern projection device, multiple light sources 11 are lit in turn, which may cause overheating to easily accumulate on the side wall of the outer shell 40 close to the light source mounting plate 10. The heat dissipation fins 50 are arranged on the outer wall of the outer shell 40 close to the light source mounting plate 10, so that the heat emitted by the multiple light sources 11 can be promptly discharged to the outside of the outer shell 40 through the heat dissipation fins 50, thereby avoiding damage caused by excessive overheating accumulated in the pattern projection device, thereby improving the service life of the pattern projection device.

[0056] The housing 40 can play a role in preventing dust. In addition, the housing 40 can also be provided with a first assembly hole 42, and the housing 40 is connected to the heat sink 50 through the connection piece 43 and the first assembly hole 42, which can further improve the stability of the installation of the heat sink 50. The first bracket 44 is provided with a plurality of assembly columns 441, and the housing 40 is provided with a plurality of second assembly holes 46 that cooperate with the assembly columns 441. More specifically, the material of the heat sink 50 can be copper or aluminum alloy.

[0057] In some embodiments of the present application, Figure 1 As shown, the pattern projection device also includes a shielding lens barrel 60 connected to the outer shell 40, the shielding lens barrel 60 is located on the light-emitting side of the outer shell 40, the inner circumference 61 of the shielding lens barrel 60 is a conical surface, and the inner circumference 61 is opaque; the light collimated by the collimated light source assembly 21 passes through the corresponding sub-lens 300 and the projected light is normal light, and the light collimated by the adjacent sub-lens 300 of the corresponding sub-lens 300 and the projected light is stray light, and the shielding lens barrel 60 is used to shield the secondary image formed by the stray light.

[0058] In the embodiment of the present application, during the projection process of the pattern projection device, the collimated light will enter the corresponding sub-lens 300 in the microlens array 30. This light is normal light after being emitted from the sub-lens 300, and the normal light can be projected to the projection area to form a complete projection pattern 70; while the light with a larger divergence angle entering the microlens array 30 may enter the adjacent sub-lens 300 of the corresponding sub-lens 300. This light is stray light after being emitted from the sub-lens 300. Since the stray light is formed by the light with a large divergence angle, after the stray light and the normal light pass through the microlens array 30 together, the stray light is distributed on the peripheral side of the normal light. When the stray light is projected to the projection area, it will form another circle of projection pattern 70 around the projection pattern 70 formed by the normal light, resulting in a poor user experience. In the embodiment of the present application, the shielding lens barrel 60 is arranged at the light-emitting side of the shell 40 or is sleeved on the outside of the shell 40. When the above-mentioned normal light and stray light are emitted from the light-emitting side of the shell 40 together, the shielding lens barrel 60 can absorb or block the stray light in the outer circle of the normal light, so that the stray light cannot be projected into the projection area, and only the normal light can be projected into the projection area, that is, only a complete and clear pattern will appear in the projection area, thereby improving the user's viewing experience.

[0059] In some embodiments of the present application, Figure 1 As shown, a protective lens 62 is provided at one end of the shielding lens barrel 60 away from the housing 40 and forms a preset angle with the optical axis.

[0060] In the embodiment of the present application, the protective lens 62 is used to seal the light-emitting end of the shielding lens barrel 60, and protect the light source 11, the collimated light source assembly 21, and the microlens array 30 inside the pattern projection device from dust, water vapor, and external scratches. In addition, the protective lens 62 is at a preset angle with the optical axis to prevent the light reflected back by the protective lens 62 from re-entering the original optical path and forming an image again, thereby forming a rotationally symmetrical ghost image.

[0061] In some embodiments of the present application, Figure 2 , Figure 3 and Figure 4 As shown, the sub-pattern area includes a plurality of annular areas arranged radially, the annular areas include a plurality of micro-patterns 330 arranged circumferentially, the micro-pattern 330 includes a complete micro-pattern 330a and an incomplete micro-pattern 330b, the complete micro-pattern 330a is a pattern formed by complete light transmission, the incomplete micro-pattern 330b is a pattern formed by partial light transmission, and each circle of incomplete micro-patterns 330b has the same shape, so that the projection pattern 70 is clear and has consistent brightness.

[0062] In the embodiment of the present application, during the use of the pattern projection device, when the projection light in the pattern projection device is tilted relative to the projection area, the projection pattern 70 will be elongated in the projection area, so that the brightness of the projection pattern 70 in the projection area is inconsistent and uneven. For example, when the pattern projection device is working, the portion of the projection pattern 70 close to the light source 11 has higher brightness, and the portion away from the light source 11 has lower brightness, resulting in a gradual and uneven distribution of the brightness of the projection pattern 70. In the embodiment of the present application, a complete micropattern 330a and an incomplete micropattern 330b are arranged in the micropattern layer 33, wherein the complete micropattern 330a is a pattern formed by complete light transmission, and the light can pass through the entire micropattern 330 and be projected to the projection area, so that the micropattern layer 33 can ensure the presentation of a complete pattern when in the projection area; the incomplete micropattern 330b is a pattern formed by partial light transmission. In the embodiment of the present application, the opaque portion of the incomplete micropattern 330b cannot penetrate the light, thereby reducing the brightness of the opaque portion when projected on the projection area. According to the actual application scenario, by adjusting the opaque portion, the brightness of the projection pattern 70 superimposed on the image in the projection area is made more uniform. Furthermore, precisely because the collimated light distribution is opposite to the annular areas radially arranged on the micro-pattern layer 33 , the brightness of the projection pattern 70 can be more conveniently and accurately regulated.

[0063] In some embodiments of the present application, the sub-lens 300 in the microlens array 30 is a plano-convex, bi-convex or free-form microlens or a Fresnel lens, a diffractive lens, or a super lens.

[0064] In the embodiment of the present application, the sub-lens 300 of the microlens array 30 has a curvature that can converge or image light. Specifically, in the embodiment of the present application, the sub-lens 300 can be in the shape of a biconvex lens.

[0065] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A pattern projection device, characterized in that: Including arranged in sequence along the optical axis: A light source mounting plate (10), wherein a plurality of light sources (11) are arranged at intervals on the light source mounting plate (10), and a first partition plate (12) is provided between adjacent light sources (11), so that each light source (11) forms an independent sub-light emitting area (13); A plurality of collimated light source assemblies (21) are arranged opposite to the plurality of light sources (11), the collimated light source assemblies (21) being configured to generate parallel incident light from the light sources (11); a second partition (22) is arranged between adjacent collimated light source assemblies (21), one end of the second partition (22) is connected to the first partition (12), and the first partition (12) and the second partition (22) are collinear, so that the collimated light source assemblies (21) correspond one to one with the sub-light emitting areas (13); A microlens array (30), the microlens array (30) comprising a micropattern layer (33) and a first microlens array (31) and a second microlens array (32) which are arranged relatively parallel to each other; the first microlens array (31) is arranged between the collimated light source assembly (21) and the second microlens array (32), and the micropattern layer (33) is located on a side of the first microlens array (31) close to or far from the collimated light source assembly (21); The micro-pattern layer (33) comprises a plurality of sub-pattern regions, each of the sub-pattern regions comprises a plurality of micro-patterns (330), and the micro-patterns (330) of each sub-pattern region are different; the sub-pattern regions are opposite to the sub-light-emitting regions (13) one by one through the collimated light source assembly (21); The other end of the second partition plate (22) abuts against a side of the microlens array (30) close to the light source (11), so that light from the same light source (11) is collimated by the corresponding collimated light source assembly (21) and then incident on the sub-pattern area corresponding to the light source (11); The first microlens array (31) and the second microlens array (32) each comprise a plurality of sub-lenses (300); the micro-patterns (330) are arranged in one-to-one correspondence with the sub-lenses (300); the micro-patterns (330) in each sub-pattern area are imaged by the corresponding sub-lenses (300) and overlap at the same position; A controller is electrically connected to the plurality of light sources (11).

2. The pattern projection device according to claim 1, characterized in that: The area of ​​each sub-light emitting region (13) is equal.

3. The pattern projection device according to claim 1, characterized in that: The number of the light sources (11) is four, and the four light sources (11) are evenly and symmetrically arranged on the light source mounting plate (10).

4. The pattern projection device according to claim 3, characterized in that: The light sources (11) are centrally symmetrically distributed on the light source mounting plate (10), or uniformly distributed in a first direction.

5. The pattern projection device according to claim 1, characterized in that: The light colors or light brightness of the multiple light sources (11) are different.

6. The pattern projection device according to claim 1, characterized in that: The pattern projection device further comprises: a housing (40) for accommodating the light source mounting plate (10), the plurality of collimated light source assemblies (21) and the microlens array (30); A connecting frame (41) is provided on the outer shell (40), and the outer shell (40) is connected to an external device via the connecting frame (41).

7. The pattern projection device according to claim 6, characterized in that: The pattern projection device further comprises a heat dissipation fin (50), wherein the heat dissipation fin (50) is arranged on an outer wall of the housing (40) close to the light source mounting plate (10).

8. The pattern projection device according to claim 7, characterized in that: The pattern projection device further comprises: a shielding lens barrel (60) connected to the housing (40), the shielding lens barrel (60) being located on the light-emitting side of the housing (40), the inner circumferential surface (61) of the shielding lens barrel (60) being a conical surface, and the inner circumferential surface (61) being opaque to light; The light projected after the light collimated by the collimated light source assembly (21) passes through the corresponding sub-lens (300) is normal light, and the light projected after the light collimated by the collimated light passes through the adjacent sub-lens (300) of the corresponding sub-lens (300) is stray light. The shielding lens barrel (60) is used to shield the stray light.

9. The pattern projection device according to claim 8, characterized in that: One end of the shielding lens barrel (60) away from the housing (40) is provided with a protective lens (62) which forms a preset angle with the optical axis.

10. The pattern projection device according to any one of claims 1 to 9, characterized in that: The sub-lenses (300) in the micro-lens array (30) are plano-convex, bi-convex or free-form surface micro-lenses or Fresnel lenses, diffraction lenses or super-lenses.

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