WO2019184789A1

WO2019184789A1 - Laser projection device and mobile terminal

Info

Publication number: WO2019184789A1
Application number: PCT/CN2019/079028
Authority: WO
Inventors: 周华昭; 肖强; 林华鑫
Original assignee: 维沃移动通信有限公司
Priority date: 2018-03-27
Filing date: 2019-03-21
Publication date: 2019-10-03
Also published as: CN108398847B; CN108398847A

Abstract

A laser projection device (1); the laser projection device comprises a laser light source module (10) and a code shielding structure (11) located on the laser light source module; the laser light source module is disposed with a plurality of luminous points (102) on a surface facing the code shielding structure; the code shielding structure includes a shielding area (11a) for shielding a pattern and a light transparent area (11b) located outside the shielded pattern; the laser projection device further includes a light guide structure (12) located between the laser light source module and the code shielding structure, and the light guide structure guides the laser light projected by the laser light source module to the shielding area to the light transparent area.

Description

Laser projection device and mobile terminal

Cross-reference to related applications

The present application claims priority to Chinese Patent Application No. 201 810 025 066, filed on Jan. 27, s.

Technical field

The present disclosure relates to the field of laser devices, and more particularly to a laser projection device and a mobile terminal that improve light energy utilization.

Background technique

In the field of consumer electronics, deep sensing technology helps to improve the intelligence level and interaction ability of electronic products. The depth perception technology based on structured light active vision mode, such as active projection of graphics by laser graphics projector and acquisition by image sensor, can be more accurate. Obtaining the depth information of the target object or the projection space, compared with the binocular stereo camera, the structured light active vision mode performs feature calibration on the active projectile or the projection space by the structured light, and the obtained depth information is more stable and reliable, and is subjected to ambient light. The impact is small.

The current laser pattern projector illuminates the coded shielding structure by the laser light source of the array to form a coded shadow pattern, and the coded shadow pattern is projected onto the surface of the object by the focused projection objective lens to form a pattern on the surface of the object; When the laser is irradiated on the coded shielding structure, part of the laser energy is absorbed by the coded shielding structure, and the laser energy loss is large, and the power consumption is required for the mobile terminal, and the image sensor receiving the laser needs to adopt a large aperture.

Summary of the invention

Embodiments of the present disclosure provide a laser projection apparatus and a mobile terminal to solve the problem that part of the laser energy is absorbed by the coded shielding structure, causing laser energy loss and increasing power consumption of the mobile terminal.

In order to solve the above technical problems, the present disclosure is implemented as follows:

A laser projection device is provided, comprising: a laser light source assembly and a coded shielding structure on the laser light source assembly, the laser light source assembly being provided with a plurality of light-emitting points facing a surface of the coded shielding structure, the coded shielding structure The shielding device includes a shielding area provided with the shielding pattern and a light transmitting area outside the shielding pattern, the laser projection device further comprising a light guiding structure located between the laser light source components, the light guiding structure projecting the laser light source assembly toward the shielding area The laser is directed to the light transmitting region.

A mobile terminal is provided, the mobile terminal comprising the laser projection device described above.

In the embodiment of the present disclosure, by providing a light guiding structure on a propagation path of the laser light source assembly projecting the laser light to the coded shielding structure, the coded shielding structure does not absorb laser energy, avoiding loss of laser energy, and avoiding increased movement. The power consumption of the terminal.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the disclosure, and are intended to be a In the drawing:

1 is a schematic view of a laser projection apparatus of a first embodiment of the present disclosure.

2 is a schematic view of an optical path of a laser projector of a first embodiment of the present disclosure.

Fig. 3 is a view showing a state of use of the laser projector of the first embodiment of the present disclosure.

4 is a schematic view of a laser projection device of a second embodiment of the present disclosure.

5A is a schematic view of a first optical path of a laser projection device according to a second embodiment of the present disclosure.

5B is a schematic view of a second optical path of the laser projection device of the second embodiment of the present disclosure.

5C is a schematic view of a third optical path of the laser projection device of the second embodiment of the present disclosure.

5D is a fourth optical path diagram of the laser projection device of the second embodiment of the present disclosure.

Fig. 6 is a schematic view of a laser projection apparatus of a third embodiment of the present disclosure.

Fig. 7 is a schematic view of a laser projection apparatus of a fourth embodiment of the present disclosure.

Fig. 8 is a schematic view of a laser projection apparatus of a fifth embodiment of the present disclosure.

9 is a schematic view of a laser projection device of a sixth embodiment of the present disclosure.

detailed description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

Please refer to FIG. 1 , FIG. 2 and FIG. 3 , which are schematic diagrams, optical path diagrams and states of use of the laser projection apparatus according to the first embodiment of the present disclosure. As shown, the laser projection apparatus 1 of the present embodiment includes a laser light source assembly. 10. The coded shielding structure 11 and the light guiding structure 12, the laser light source assembly 10 includes a base body 101 and a plurality of laser diodes 102 arranged on a surface of the base body 101. Each of the laser diodes 102 emits laser light and forms a light. Therefore, the surface of the base 101 provided with the plurality of laser diodes 102 has a plurality of light-emitting points. The coded shielding structure 11 is disposed on one side of the surface of the body 101 having a plurality of light-emitting points. In other words, the coded shielding structure 11 is located on the laser propagation path of the plurality of laser diodes 102. The coded masking structure 11 is provided with a masking pattern, wherein the masking pattern may employ raster coding, binary coding, two-dimensional grid pattern coding, random pattern coding, color coding, gray coding, neighborhood coding, phase coding or hybrid coding. The coded shielding structure 11 is provided with a shielding pattern as a shielding area 11a, and the coded shielding structure 11 is not provided with a shielding pattern as a light transmitting area 11b, that is, the light transmitting area 11b is located outside the shielding pattern. The light guiding structure 12 is located on a propagation path of the laser light emitted from the plurality of light-emitting points of the laser light source assembly 10 toward the coded shielding structure 11 . When the plurality of light-emitting points of the laser light source assembly 10 project laser light toward the coded shielding structure 11 , the light guiding light is guided. The structure 12 changes the laser light that the laser light source unit 10 projects toward the shielding area 11a, and guides the laser light that the laser light source unit 10 projects toward the shielding area 11a to be emitted from the light transmitting area 11b. The manner in which the light guiding structure 12 changes the laser light can be emitted from the light transmitting region 11b by reflecting or/and refracting and guiding the laser light.

In this embodiment, the light guiding structure 12 is disposed on the propagation path of the laser light projected from the laser light source assembly 10 toward the coded shielding structure 11, thereby effectively preventing the laser from being absorbed by the shielding area 11a of the coded shielding structure 11, thereby reducing the loss of laser energy and greatly improving Laser energy utilization rate of the laser projection device 1. When the laser projection device 1 of the present embodiment is used, the laser projection device 1 is further provided with a focused projection objective lens 13. The focused projection objective lens 13 is disposed on the side of the coded shielding structure 11 that emits laser light, so that the laser light emitted from the code shielding structure 11 is The focused projection objective 13 forms a masking pattern on the object to be detected. Next, the shielding pattern formed on the object is imaged using an infrared camera, and the laser light generated by the laser projection apparatus 1 of the present embodiment is less attenuated, and the infrared camera does not need to be specially designed for a large aperture.

Further, the light guiding structure 12 of the present embodiment includes a first light reflecting layer 121 and a second light reflecting layer 122. The first light reflecting layer 121 is disposed on the shielding area 11a, and is located at the code shielding structure 11 toward the laser light source assembly 10. s surface. The second light reflecting layer 122 is disposed on the surface of the laser light source assembly 10 facing the coded shielding structure 11 and located at a periphery of the plurality of light emitting points, that is, the second light reflecting layer 122 does not change the plurality of laser diodes 102, and the second light reflecting layer 122 Corresponding to the first light reflecting layer 121. A laser light propagation space 120 is formed between the first light reflection layer 121 and the second light reflection layer 122. When a plurality of light-emitting points of the laser light source unit 10 project laser light toward the code shielding structure 11, the laser light passes through the laser propagation space 120, and part of the laser light is directly emitted from the light-transmitting area 11b, and part of the laser light propagates toward the shielding area 11a. Before the laser light is projected onto the shielding area 11a, the first light reflecting layer 121 first reflects the laser light, and the laser light reflected by the first light reflecting layer 121 passes through the laser propagation space 120 to the second light reflecting layer 122, and the second light reflecting layer 122 re-reflects. The laser light reflected by the first light reflecting layer 121 and reflected by the second light reflecting layer 122 can be emitted from the light transmitting region 11b. If the laser light reflected by the second light reflecting layer 122 propagates toward the shielding region 11a, the above manner is repeated, and finally the laser light is led out from the light transmitting region 11b, in other words, the laser light propagating toward the shielding region 11a passes through the first light reflecting layer. 121 and the second light reflecting layer 122 are reflected and guided to the light transmitting region 11b to be emitted. As can be seen from the above, the present embodiment changes the propagation path of the laser light projected by the laser light source unit 10 toward the shielding area 11a by the first light reflecting layer 121 or/and the reflecting surface 10a, and is composed of the first light reflecting layer 121 or/and the reflecting surface 10a. The laser light projected from the laser light source unit 10 toward the shielding area 11a is guided to be emitted from the light transmitting area 11b.

In this embodiment, the surface of the laser light source assembly 10 is provided with a plurality of light-emitting points, and the surface of the laser light source assembly 10 is provided with a plurality of light-emitting points to form a reflecting surface 10a. The reflecting surface 10a is formed. It is used to reflect the laser light reflected by the first light reflecting layer 121. In another embodiment of the present disclosure, if the base 101 of the laser light source assembly 10 is made of a metal material or other reflective material, the base 101 itself becomes a reflector, and the surface of the base 101 itself having a plurality of light-emitting points is a reflective surface. 10a, so that the arrangement of the second light reflecting layer 122 can be omitted, and the above effects can also be achieved.

Please refer to FIG. 4 and FIG. 5A to FIG. 5D , which are schematic diagrams and optical paths of the laser projection apparatus according to the second embodiment of the present disclosure; as shown, the laser projection apparatus 1 of the present embodiment and the laser projection of the first embodiment are shown. The device 1 differs in that the light guiding structure 12 of the present embodiment further includes a microstructure layer 123 located on a propagation path of the laser light source assembly 10 toward the laser beam projected by the code shielding structure 11 and located in the laser propagation space 120. And corresponding to the first light reflecting layer 121, the light transmitting region 11b and a plurality of light emitting points. The microstructure layer 123 reflects or refracts the laser light passing through the first light reflection layer 121, changes the propagation path of the laser light, and guides part of the laser light to be emitted from the light transmission area 11b, and part of the laser light propagates toward the reflection surface 10a of the laser light source unit 10, so The microstructure layer 123 not only has the function of guiding the laser light to the light-transmitting region 11b and improving the utilization of the laser energy, but also has the laser light energy reduced by the first light-reflecting layer 121, and protects the plurality of laser diodes 102 of the laser light source assembly 10. effect.

In the present embodiment, the microstructure layer 123 includes a plurality of optical mirrors 1231 having the same size and arranged in a regular matrix. The optical mirror 1231 of this embodiment may be a single spherical mirror, a single aspheric mirror, a double spherical mirror, a double spherical mirror, a prism, a concave lens or a convex lens. The optical mirror 1231 of the present embodiment uses a single spherical mirror.

The shielding pattern of the coded shielding structure 11 is a grating pattern having a plurality of strip-shaped shielding blocks 111 arranged at intervals. The adjacent two strip-shaped shielding blocks 111 have a light-transmissive block 112 and a plurality of strip-shaped shielding patterns. The block 111 is a shielding area 11a, and the plurality of light transmitting blocks 112 are light transmitting areas 11b. The microstructure layer 123 of the present embodiment is disposed on the surface of the code shielding structure 11 facing the laser light source assembly 10, and covers the first light reflection layer 121 and the light transmission area 11b. Each of the optical mirrors 1231 of the microstructure layer 123 corresponds to the adjacent one. The block 111 and the light-transmissive block 112 are shielded.

The laser path of the laser projection device 1 of the present embodiment is further described. The first laser path is that the laser light projected by the laser light source assembly 10 passes through each of the optical mirrors 1231 of the microstructure layer 123, and the optical lens 1231 refracts the laser light directly. The laser light is directed to the light transmitting region 11b, and the laser light is emitted from the light transmitting region 11b as shown in Fig. 5A. The second laser path is that the laser light projected by the laser light source assembly 10 first passes through the optical mirror 1231 of the microstructure layer 123, and the laser light is reflected multiple times between the optical mirror 1231 and the first light reflection layer 121, and finally the laser light is guided by the optical mirror 1231. The light transmitting region 11b is emitted from it as shown in Fig. 5B. The first laser path and the second laser path are the microstructure layer 123 or/and the first light reflecting layer 121 changes the propagation path of the laser light projected by the laser light source assembly 10 toward the shielding region 11a, and is composed of the microstructure layer 123 or/and The first light reflecting layer 121 guides the laser light projected from the laser light source unit 10 toward the shielding area 11a to be emitted from the light transmitting area 11b.

The third laser path is the first laser path and the second laser path, part of the laser is refracted by the optical mirror and projected toward the reflective surface 10a of the laser light source assembly 10, and the reflective surface 10a reflects the refracted laser to another optical The mirror 1231, the laser light is refracted by the optical mirror 1231 and guided to the light-transmitting region 11b, and is emitted from the light-transmitting region 11b as described in FIGS. 5B and 5C. The third laser path changes the propagation path of the laser light emitted from the microstructure layer 123 toward the reflection surface 10a for the reflection surface 10a, and the reflection surface 10a faces the shadow area by the microstructure layer 123 or/and the first light reflection layer 121. The laser light reflected by 11a is guided to be emitted by the light transmitting region 11b.

The fourth laser path is that the laser light projected by the laser light source assembly 10 is reflected by the optical mirror 1231 to the adjacent optical mirror 1231, and then the adjacent optical mirror 1231 guides the laser light to the light transmitting region 11b by reflection or refraction. As shown in Figure 5D. The above laser paths are only a few laser paths exemplified in the present disclosure, and should not be limited thereto.

It can be seen from the above that the microstructure layer 123 of the present embodiment can directly refract the laser light and direct the laser light to the light transmitting region, or can perform multiple reflections with the first light reflecting layer 121 and guide the laser light to the light transmitting region 11b. A small amount of laser light is reflected or refracted to the reflecting surface 10a of the laser light source unit 10, so that another embodiment of the present disclosure can be omitted from the arrangement of the reflecting surface 10a of the laser light source unit 10, and the effect of the above embodiment can be achieved.

Please refer to FIG. 6 , which is a schematic diagram of a laser projection apparatus according to a third embodiment of the present disclosure. As shown in the figure, the laser projection apparatus 1 of the present embodiment is different from the laser projection apparatus 1 of the second embodiment in the present embodiment. The plurality of optical mirrors 1231 of the microstructure layer 123 are divided into a plurality of first optical mirrors 1231a and a plurality of second optical mirrors 1231b staggered with the plurality of first optical mirrors 1231a, and the first optical mirrors 1231a correspond to adjacent two shields. The block 111 and the transparent block 112 between the two shielding blocks 111, the second optical mirror 1231b corresponding to the adjacent two transparent blocks 112 and the shielding block 111 between the two transparent blocks 112 . This embodiment illustrates another microstructure layer 123 that can achieve the function of the microstructure layer 123 in the above embodiment, and details are not described herein again.

Please refer to FIG. 7 , which is a schematic diagram of a laser projection apparatus according to a fourth embodiment of the present disclosure. As shown in the figure, the present embodiment provides a microstructure layer 123 , a microstructure layer 123 of the second embodiment and the third embodiment. The plurality of optical mirrors 1231 of the micro-structure layer 123 of the present embodiment are arranged in an irregular manner, and at least one of the plurality of optical mirrors 1231 corresponds to the adjacent masking block 111 and the light-transmitting region. At block 112, at least one of the plurality of optical mirrors 1231 corresponds to two adjacent shielding blocks 111 and a light transmitting block 112 located between the two shielding blocks 111. At least one of the plurality of optical mirrors 1231 is adjacent to each other. The two transparent blocks 112 and the shielding block 111 between the two transparent blocks 112. The microstructure layer 123 of the present embodiment can also achieve the same function as the microstructure layer 123 of the above embodiment, and details are not described herein again.

Please refer to FIG. 8 , which is a schematic diagram of a laser projection apparatus according to a fifth embodiment of the present disclosure. As shown in the figure, another microstructure layer 123 is provided in this embodiment. The microstructure layer 123 of the embodiment is disposed on a laser light source. The reflective surface 10a of the assembly 10 includes an optically transparent body 1232 disposed on the reflective surface 10a of the laser light source assembly 10, and the surface of the optically transparent body 1232 facing the coded shielding structure 11 is a sawtooth surface, a wave surface or a concave surface. And refracting or reflecting the laser light projected by the laser light source unit 10, the laser light reflected by the first reflective layer 121, or the laser light reflected by the reflecting surface 10a of the laser light source unit 10. However, the microstructure layer 123 of the present embodiment can achieve the same function as the microstructure layer 123 of the above embodiment, and details are not described herein again. Of course, the microstructure layer 123 of the present embodiment may also be disposed on the first reflective layer 121 of the coded shielding structure 11 . The sawtooth surface, the wave surface or the concave surface of the optical transparent body 1232 of the microstructure layer 123 faces the laser light source assembly 10 . Reflecting surface 10a.

Please refer to FIG. 9 , which is a schematic diagram of a laser projection apparatus according to a sixth embodiment of the present disclosure. As shown, the microstructure layer 123 of the present embodiment is different from the microstructure layer 123 of the fifth embodiment in the present embodiment. The microstructure layer 123 is disposed between the laser light source assembly 10 and the coded shielding structure 11, that is, not in contact with the laser light source assembly 10 and the coded shielding structure 11. The surface of the optically transparent body 1232 facing the reflecting surface 10a of the laser light source unit 10 and the coded shielding structure 11 is a sawtooth surface, a wave surface or a concave surface. However, the microstructure layer 123 of the present embodiment can achieve the same function as the microstructure layer 123 of the above embodiment, and details are not described herein again.

The present disclosure further provides a mobile terminal having a laser projection device, and the laser projection device can use the laser projection device of the above embodiment.

In summary, the present disclosure provides a laser projection apparatus and a mobile terminal that are provided with a light guiding structure on a propagation path of a laser light projected onto the coded shielding structure by a laser light source assembly, and the light guiding structure is changed toward the coded shielding structure. The propagation path of the laser in the shielding area prevents the shielding area of the coding shielding structure from absorbing laser energy, avoiding the loss of laser energy, and avoiding increasing the power consumption of the mobile terminal, and the infrared camera used by the detecting end does not need to increase the aperture. .

It is to be understood that the term "comprises", "comprising", or any other variants thereof, is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes those elements. It also includes other elements that are not explicitly listed, or elements that are inherent to such a process, method, article, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

The embodiments of the present disclosure have been described above with reference to the drawings, but the present disclosure is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative and not restrictive, and those skilled in the art In the light of the present disclosure, many forms may be made without departing from the scope of the disclosure and the scope of the appended claims.

Claims

A laser projection device comprising a laser light source assembly and a coded shielding structure on the laser light source assembly, the laser light source assembly being provided with a plurality of light emitting points facing a surface of the coded shielding structure, the coded shielding structure comprising a shielding area provided with a shielding pattern and a light transmitting area outside the shielding pattern, further comprising a light guiding structure between the laser light source assembly and the coded shielding structure, the light guiding structure to the laser light source assembly Laser light projected to the masking region is directed to the light transmissive region.
The laser projection device of claim 1, wherein the light guiding structure comprises a first light reflecting layer, the first light reflecting layer is disposed in the shielding area, and the coded shielding structure faces the laser a surface of the light source assembly, the surface of the laser light source assembly facing the coded shielding structure is a reflective surface, and the first light reflecting layer reflects a laser light projected by the laser light source assembly toward the shielding area, and the reflective surface is Laser light projected from the laser light source assembly toward the shielding region is directed to the light transmitting region.
The laser projection device according to claim 1, wherein the light guiding structure comprises a first light reflecting layer and a microstructure layer, wherein the first light reflecting layer is disposed in the shielding area and located in the coded shielding structure a surface of the laser light source assembly, the microstructure layer is disposed on a propagation path of the laser light source assembly to the laser of the coded shielding structure, and corresponds to the first reflective layer, the transparent region, and the a plurality of light-emitting points, the microstructure layer or/and the first light-reflecting layer reflecting or refracting laser light projected by the laser light source assembly toward the shielding region, and the microstructure layer or/and the The first light reflecting layer directs the laser light projected by the laser light source assembly toward the shielding region to the light transmitting region.
The laser projection apparatus according to claim 3, wherein said laser light source assembly faces a surface of said coded shielding structure as a reflecting surface, said reflecting surface reflecting laser light emitted from said microstructured layer toward said reflecting surface And directing, by the microstructure layer or/and the first light reflecting layer, laser light reflected by the reflecting surface toward the shielding region to the light transmitting region.
The laser projection device according to claim 2 or 4, wherein the light guiding structure further comprises a second light reflecting layer, the second light reflecting layer being disposed on a surface of the laser light source assembly facing the coded shielding structure And located at a periphery of the plurality of light-emitting points, such that the surface of the laser light source assembly facing the coded shielding structure is the reflective surface.
The laser projection apparatus according to claim 3 or 4, wherein said microstructure layer comprises a plurality of optical mirrors, and said plurality of optical mirrors are arranged to propagate laser light projected from said laser light source unit toward said coded shield structure On the path.
The laser projection apparatus according to claim 6, wherein the shielding area comprises a plurality of shielding blocks, and the light transmitting area comprises a plurality of light transmitting blocks staggered with the plurality of shielding blocks, the optical mirror Corresponding to the adjacent the shielding block and the transparent block; or the optical mirror corresponding to two adjacent shielding blocks and the transparent block located in the two shielding blocks Or the optical mirror corresponds to the two adjacent transparent blocks and the shielding block disposed between the two transparent blocks.
The laser projection device according to claim 3 or 4, wherein the microstructure layer comprises an optically transparent body, the surface of the optically transparent body facing the laser light source assembly or/and the first reflective layer being a serrated surface , wavy or concave surface.
A mobile terminal comprising the laser projection device of any of claims 1-8.