CN112611546A

CN112611546A - Laser projection module, depth camera and electronic device

Info

Publication number: CN112611546A
Application number: CN202011544934.3A
Authority: CN
Inventors: 吕杰; 白剑
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-02-27
Filing date: 2018-02-27
Publication date: 2021-04-06
Also published as: CN108196418A

Abstract

The invention discloses a laser projection module, a depth camera and an electronic device. The laser projection module comprises a laser emitter, an optical assembly, a circuit board assembly and a processor. The optical assembly is provided with a detection element. The circuit board assembly comprises a circuit board and a conductive element, and the detection element is electrically connected with the circuit board through the conductive element. The processor is connected with the circuit board. The processor is used for receiving the electric signal output by the detection element to judge whether the optical component is broken or not. According to the laser projection module, the depth camera and the electronic device, the detection element is arranged on the optical assembly, and the conductive element is used for electrically connecting the detection element with the circuit board, so that the processor can receive an electric signal output by the detection element, judge whether the optical assembly is broken according to the electric signal, and timely turn off the laser emitter or reduce the power of the laser emitter after the optical assembly is detected to be broken, so that the problem that the eyes of a user are injured due to overlarge laser energy is avoided.

Description

Laser projection module, depth camera and electronic device

Technical Field

The invention relates to the technical field of imaging, in particular to a laser projection module, a depth camera and an electronic device.

Background

Some existing laser transmitters can emit laser with a strong focusing signal, and the energy of the laser can be attenuated after the laser passes through a collimating element and a diffraction element, so that the condition that the signal intensity is lower than the damage threshold to a human body is met. These laser emitters are generally made of glass or other easily breakable parts, and when the lens is broken due to a fall or the like, the laser light is directly emitted to irradiate the body or eyes of the user, which causes a serious safety problem.

Disclosure of Invention

The embodiment of the invention provides a laser projection module, a depth camera and an electronic device.

The laser projection module comprises a laser emitter, an optical assembly, a circuit board assembly and a processor connected with the circuit board assembly. The laser emitter is used for emitting laser. The optical assembly is arranged on a light emitting path of the laser emitter, laser passes through the optical assembly to form a laser pattern, and the optical assembly is provided with a detection element. The circuit board assembly comprises a circuit board and a conductive element, the detection element is electrically connected with the circuit board through the conductive element, and the laser transmitter is arranged on the circuit board assembly. The processor is used for receiving the electric signal output by the detection element to judge whether the optical component is broken or not.

The depth camera comprises the laser projection module, an image collector and a processor. The image collector is used for collecting laser patterns projected into a target space by the laser projection module, and the processor is used for processing the laser patterns to obtain a depth image.

The electronic device of the embodiment of the invention comprises a shell and the depth camera. The depth camera is disposed within and exposed from the housing to acquire a depth image.

According to the laser projection module, the depth camera and the electronic device, the detection element is arranged on the optical assembly, and the conductive element is used for electrically connecting the detection element with the circuit board, so that the processor can receive an electric signal output by the detection element to judge whether the optical assembly is broken or not according to the electric signal. After detecting optical assembly and breaking, in time close laser emitter or reduce laser emitter's power to avoid optical assembly to break and lead to the too big problem of injury user's eyes of the laser energy of transmission, promote the security that laser projection module used.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a laser projection module according to some embodiments of the present invention.

FIG. 2 is a schematic cross-sectional view of the laser projection module of FIG. 1 taken along line II-II.

FIG. 3 is a schematic layout of a collimating conductive electrode according to some embodiments of the present invention.

Fig. 4 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

FIG. 5 is a schematic cross-sectional view of the laser projection module of FIG. 4 taken along line V-V.

Fig. 6 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

Fig. 7 is a schematic cross-sectional view of the laser projection module of fig. 6 taken along line VII-VII.

Fig. 8 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

Figure 9 is a cross-sectional schematic view of a diffraction element according to some embodiments of the present invention.

FIG. 10 is a schematic layout of a diffractive conductive electrode according to some embodiments of the invention.

FIG. 11 is a schematic cross-sectional view of the laser projection module of FIG. 8 taken along line XI-XI.

Fig. 12 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

FIG. 13 is a schematic cross-sectional view of the laser projection module of FIG. 12 taken along line XIII-XIII.

Fig. 14 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

FIG. 15 is a schematic cross-sectional view of the laser projection module of FIG. 14 taken along line XV-XV.

Fig. 16 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

FIG. 17 is a cross-sectional schematic view of a collimating element according to some embodiments of the present invention.

Fig. 18 is a schematic layout of a collimated conductive path according to some embodiments of the present invention.

FIG. 19 is a cross-sectional view of the laser projection module of FIG. 16 taken along line XIX-XIX.

Fig. 20 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

FIG. 21 is a cross-sectional view of the laser projection module of FIG. 20 taken along line XXI-XXI.

Fig. 22 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

FIG. 23 is a schematic cross-sectional view of the laser projection module of FIG. 22 taken along line XXIII-XXIII.

Fig. 24 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

Figure 25 is a cross-sectional schematic view of a diffraction element according to some embodiments of the present invention.

FIG. 26 is a schematic layout of a diffractive conductive via according to some embodiments of the invention.

Fig. 27 is a schematic cross-sectional view of the laser projection module of fig. 24 taken along line XXVII-XXVII.

Fig. 28 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

Fig. 29 is a schematic cross-sectional view of the laser projection module of fig. 28 taken along line XXIX-XXIX.

Fig. 30 is a schematic structural diagram of a laser projection module according to some embodiments of the invention.

FIG. 31 is a schematic cross-sectional view of the laser projection module of FIG. 30 taken along line XXXI-XXXI.

Fig. 32 and 33 are schematic structural views of a laser projection module according to some embodiments of the present invention.

Fig. 34 to 36 are schematic partial structural views of a laser projection module according to some embodiments of the present invention.

FIG. 37 is a schematic diagram of a depth camera in accordance with certain embodiments of the invention.

Fig. 38 is a schematic structural diagram of an electronic device according to some embodiments of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 1 and 2, a laser projection module 100 according to an embodiment of the invention includes a laser emitter 10, an optical assembly 40, a circuit board assembly 50, and a processor 80. The laser emitter 10 is used for emitting laser, the optical assembly 40 is arranged on a light emitting optical path of the laser emitter 10, and the laser forms a laser pattern after passing through the optical assembly 40. The optical assembly 40 is provided with a detection element 70. The circuit board assembly 50 includes a circuit board 51 and a conductive member 52. The detection element 70 is electrically connected to the circuit board 51 through the conductive member 52. The laser transmitter 10 is disposed on a circuit board assembly 50. The processor 80 is connected to the circuit board 51. The processor 80 is used for receiving the electrical signal output by the detecting element 70 to determine whether the optical assembly 40 is broken.

The laser projection module 100 further includes a lens barrel 60. The lens barrel 60 is disposed on the circuit board 51 and encloses an accommodation cavity 62 with the circuit board 51. The laser transmitter 10 is received in the receiving cavity 62. The optical assembly 40 includes a diffractive element 30 and a collimating element 20 housed within a housing cavity 62. The collimating element 20 and the diffractive element 30 are disposed in sequence along a light emitting optical path of the laser transmitter 10. Wherein the collimating element 20 is used for collimating the laser light emitted by the laser light emitter 10. The diffraction element 30 is used to diffract the laser light collimated by the collimating element 20 to form a laser light pattern.

The laser projection module 100 of the embodiment of the invention is provided with the detection element 70 on the optical assembly 40, and the conductive element 52 is used to electrically connect the detection element 70 with the circuit board 51, so that the processor 80 can receive the electrical signal output by the detection element 70 to judge whether the optical assembly 40 is broken according to the electrical signal. After detecting that the optical component 40 is broken, the laser emitter 10 is turned off or the power of the laser emitter 10 is reduced in time, so as to avoid the problem that the eyes of the user are injured due to the fact that the laser energy emitted by the broken optical component 40 is too large, and improve the safety of the laser projection module 100 in use.

Referring to fig. 1 to 3, in some embodiments, the conductive elements 52 are multiple, and the detecting element 70 is a transparent collimating conductive film 21. A light-transmissive collimating conductive film 21 is disposed on the collimating element 20, and a collimating conductive electrode 22 is disposed on the light-transmissive collimating conductive film 21. The mechanism for determining whether the collimating element 20 is broken or not is as follows: when the collimating element 20 is in a good state, the resistance of the transparent collimating conductive film 21 is small, and in this state, the transparent collimating conductive film 21 is energized, that is, a certain voltage is applied, so that the current output by the collimating conductive electrode 22 acquired by the processor 80 is large. When the collimating element 20 is broken, the transparent collimating conductive film 21 formed on the collimating element 20 is also broken, and the resistance value of the transparent collimating conductive film 21 at the broken position is close to infinity, so that the collimating conductive electrode 22 on the transparent collimating conductive film 21 is powered on in this state, and the current output by the collimating conductive electrode 22 acquired by the processor 80 is small. Therefore, in the first mode, whether the collimating element 20 is broken or not can be determined according to the difference between the collimated electrical signal (i.e. current) and the collimated electrical signal (i.e. current) detected in the state where the collimating element 20 is not broken, and further, whether the collimating element 20 is broken or not can be determined according to the state of the light-transmitting collimating conductive film 21, that is, if the light-transmitting collimating conductive film 21 is broken, it indicates that the collimating element 20 is also broken; if the light-transmissive collimating conductive film 21 is not broken, it indicates that the collimating element 20 is not broken either. The second mode is as follows: whether the collimating element 20 is broken or not can be directly judged according to the collimating electrical signal output by the collimating conductive electrode 22 on the collimating element 20 after being electrified, specifically, when the collimating electrical signal output by the collimating conductive electrode 22 is not within a preset collimating range, the collimating element 20 is determined to be broken, and then the collimating element 20 is judged to be broken; if the collimation electric signal output by the collimation element 20 is within the preset collimation range, it is determined that the collimation element 20 is not broken, and it is determined that the collimation element 20 is not broken.

The light-transmitting collimating conductive film 21 may be formed on the surface of the collimating element 20 by plating or the like. The light-transmitting collimating conductive film 21 may be made of any one of Indium Tin Oxide (ITO), nano silver wire, and metallic silver wire. Indium tin oxide, nano silver wire and metal silver wire all have good light transmittance and electric conductivity, can realize the output of the collimation electric signal after being electrified, and can not shield the light-emitting light path of the collimation element 20.

Specifically, the collimating element 20 includes a collimating incident surface 201 and a collimating emergent surface 202, and the light-transmitting collimating conductive film 21 is a single-layer structure and is disposed on the collimating incident surface 201 or the collimating emergent surface 202. The light-transmitting collimating conductive film 21 is provided with a plurality of collimating conductive electrodes 22, and the plurality of collimating conductive electrodes 22 are not intersected with each other. Each collimating conductive electrode 22 comprises a collimating input 221 and a collimating output 222. Each of the collimation input terminals 221 and the collimation output terminals 222 are connected to the processor 80 to form a collimation conductive loop, and thus the collimation input terminals 221 and the collimation output terminals 222 of the plurality of collimation conductive electrodes 22 are respectively connected to the processor 80 to form a plurality of collimation conductive loops. The arrangement of the plurality of collimating conductive electrodes 22 is various, for example, the extending direction of each collimating conductive electrode 22 is the length direction of the light-transmitting collimating conductive film 21, and the plurality of collimating conductive electrodes 22 are arranged in parallel at intervals (as shown in fig. 3); alternatively, the extending direction of each collimating conductive electrode 22 is the width direction of the light-transmitting collimating conductive film 21, and a plurality of collimating conductive electrodes 22 are arranged in parallel at intervals (not shown); alternatively, the plurality of collimation conductive electrodes 22 extend in a diagonal direction of the light-transmissive collimation conductive film 21, and the plurality of collimation conductive electrodes 22 are arranged in parallel at intervals (not shown). No matter which of the above-mentioned arrangement modes of the collimation conductive electrodes 22 is adopted, compared with the arrangement of a single collimation conductive electrode 22, the plurality of collimation conductive electrodes 22 can occupy more areas of the light-transmitting collimation conductive film 21, and accordingly more collimation electrical signals can be output, and the processor 80 can more accurately judge whether the light-transmitting collimation conductive film 21 is broken according to more collimation electrical signals, further judge whether the collimation element 20 is broken, and improve the accuracy of the detection of the breakage of the collimation element 20. The light-transmitting collimating conductive film 21 may also be a single-layer bridge structure, the light-transmitting collimating conductive film 21 of the single-layer bridge structure is similar to the light-transmitting diffractive conductive film 31 of the single-layer bridge structure provided on the diffractive element 30, and the light-transmitting diffractive conductive film 31 of the single-layer bridge structure will be described later, so that the light-transmitting collimating conductive film 21 of the single-layer bridge structure is not expanded in detail here.

The positions of the conductive elements 52 connecting the collimating conductive electrodes 22 with the circuit board 51 may be: a plurality of conductive elements 52 are attached to the inner surface of the sidewall 61 of the lens barrel 60, one end of each conductive element 52 is electrically connected to the collimation input end 221 or the collimation output end 222, and the other end is electrically connected to the circuit board 51 (as shown in fig. 1 and 2); alternatively, the sidewall 61 of the lens barrel 60 is provided with a groove 63 corresponding to the plurality of conductive elements 52, the plurality of conductive elements 52 are disposed in the corresponding groove 63, one end of each conductive element 52 is electrically connected to the collimation input end 221 or the collimation output end 222, and the other end is electrically connected to the circuit board 51 (as shown in fig. 4 and 5); alternatively, the sidewall 61 of the lens barrel 60 is axially provided with an annular hole 64, the plurality of conductive elements 52 are disposed in the annular hole 64, one end of each conductive element 52 is electrically connected to the collimation input end 221 or the collimation output end 222, and the other end is electrically connected to the circuit board 51 (as shown in fig. 6 and 7).

The conductive element 52 may be a crystal wire 521 or a spring piece 522.

For example, as shown in fig. 1 and 2, the conductive element 52 is a spring 522. The circuit board 51 is provided with a plurality of elastic pieces 522, and the lengths of the plurality of elastic pieces 522 extend towards the light emitting direction of the laser emitter 10. The plurality of elastic pieces 522 are attached to the inner surface of the sidewall 61 of the lens barrel 60, and the number of the elastic pieces 522 is twice of the number of the collimated conductive electrodes 22. One end of each spring 522 is connected to the circuit board 51, and the other end is connected to the alignment input 221 or the alignment output 222. The plurality of elastic pieces 522 are arranged at intervals, so that the plurality of elastic pieces 522 are ensured to be insulated from each other, and the plurality of collimation conductive electrodes 22 are ensured to be insulated from each other. Of course, the remaining surface of each spring 522 except the contact position with the alignment input end 221 or the alignment output end 222 may be coated with an insulating material to further ensure the mutual insulation between the plurality of alignment conductive electrodes 22.

As shown in fig. 4 and 5, the side wall 61 of the lens barrel 60 is provided with a groove 63 corresponding to the plurality of elastic pieces 522, and the plurality of elastic pieces 522 are disposed in the corresponding grooves 63. The positions of the elastic pieces 522 correspond to the positions of the plurality of collimation input ends 221 and the plurality of collimation output ends 222 one to one. The length of the elastic pieces 522 extends towards the light emitting direction of the laser emitter 10, and one end of each elastic piece 522 is in contact with the circuit board 51, and the other end is in contact with the collimation input end 221 or the collimation output end 222.

As shown in fig. 6 and 7, the conductive element 52 is a crystal wire 521, the sidewall 61 of the lens barrel 60 is axially opened with an annular hole 64, and a plurality of crystal wires 521 are all accommodated in the annular hole 64. One end of a part of the crystal wires 521 is electrically connected with the collimation input end 221, the other end of the part of the crystal wires 521 is electrically connected with the circuit board 51, one end of the other part of the crystal wires 521 is electrically connected with the collimation output end 222, and the other end of the other part of the crystal wires 521 is electrically connected with the circuit board 51. The outer layer of the plurality of crystal lines 521 may be covered with an insulating material, so as to avoid the problem that the plurality of alignment conductive electrodes 22 are not insulated from each other due to the contact between the plurality of crystal lines 521.

In addition, the crystal wire 521 may be attached to the inner surface of the lens barrel 60 or disposed in the groove 63 formed in the sidewall 61 of the lens barrel 60; the spring plate may also be received in the annular aperture 64.

Referring to fig. 8 to 11, in some embodiments, the conductive elements 52 are multiple, and the detecting element 70 is a transparent diffractive conductive film 31. The light-transmitting diffractive conductive film 31 is provided on the diffraction element 30. The light-transmitting diffractive conductive film 31 is provided with a diffractive conductive electrode 32. The mechanism for judging whether the diffraction element 30 is broken or not is the same as that for judging whether the collimating element 20 is broken or not when the transparent collimating conductive film 21 is disposed thereon, and will not be described herein again. The material of the transparent diffraction conductive film 31 is the same as that of the transparent collimation conductive film 21, and is not described herein again.

Specifically, the diffraction element 30 includes a diffraction incident surface 301 and a diffraction exit surface 302, and the light-transmitting diffraction conductive film 31 is a single-layer bridge structure and is provided on the diffraction exit surface 302. The light-transmitting diffraction conductive film 31 having a single-layer bridge structure is provided with a plurality of diffraction conductive electrodes 32. The plurality of diffractive conductive electrodes 32 includes a plurality of parallel spaced apart first diffractive conductive electrodes 323, a plurality of parallel spaced apart second diffractive conductive electrodes 324, and a plurality of bridging diffractive conductive electrodes 325. The plurality of first diffractive conductive electrodes 323 and the plurality of second diffractive conductive electrodes 324 are criss-crossed, each first diffractive conductive electrode 323 is continuous and uninterrupted, and each second diffractive conductive electrode 324 is disconnected at the crossed position with the corresponding first diffractive conductive electrode 323 and is not conducted with the plurality of first diffractive conductive electrodes 323. Each bridging diffractive conductive electrode 325 connects the corresponding second diffractive conductive electrode 324 at the off position. A diffraction insulator 326 is arranged at the crossed position of the bridging diffraction conductive electrode 325 and the first diffraction conductive electrode 323. Both ends of each first diffractive conductive electrode 323 are connected with the processor 80 to form a diffractive conductive loop, and both ends of each second diffractive conductive electrode 324 are connected with the processor 80 to form a diffractive conductive loop, so that both ends of the plurality of first diffractive conductive electrodes 323 are respectively connected with the processor 80 to form a plurality of diffractive conductive loops, and both ends of the plurality of second diffractive conductive electrodes 324 are respectively connected with the processor 80 to form a plurality of diffractive conductive loops. The material of the diffractive insulator 326 may be an organic material with good light transmittance and insulation, and the diffractive insulator 326 may be manufactured by a silk-screen printing process or a yellow light process. The criss-cross of the first diffractive conductive electrodes 323 and the second diffractive conductive electrodes 324 means that the first diffractive conductive electrodes 323 and the second diffractive conductive electrodes 324 are vertically staggered, that is, the included angle between the first diffractive conductive electrodes 323 and the second diffractive conductive electrodes 324 is 90 degrees. Of course, in other embodiments, the plurality of first diffractive conductive electrodes 323 and the plurality of second diffractive conductive electrodes 324 may be crisscrossed, or the plurality of first diffractive conductive electrodes 323 and the plurality of second diffractive conductive electrodes 324 may be obliquely crossed with each other. When the light-transmitting diffraction conductive film 31 is used, the processor 80 may simultaneously energize the plurality of first diffraction conductive electrodes 323 and the plurality of second diffraction conductive electrodes 324 to obtain a plurality of diffraction electrical signals, or the processor 80 may sequentially energize the plurality of first diffraction conductive electrodes 323 and the plurality of second diffraction conductive electrodes 324 to obtain a plurality of diffraction electrical signals, and then the processor 80 determines whether the light-transmitting diffraction conductive film 31 is cracked or not according to the diffraction electrical signals. For example, when it is detected that the electrical diffraction signal output from the first diffractive conductive electrode 323 of the number (r) is not within the preset diffraction range and the electrical diffraction signal output from the second diffractive conductive electrode 324 of the number (c) is not within the preset diffraction range, it is described that the light-transmissive diffractive conductive film 31 is broken at the intersection between the first diffractive conductive electrode 323 of the number (r) and the second diffractive conductive electrode 324 of the number (c), and the diffraction element 30 is also broken at a position corresponding to the broken position of the light-transmissive diffractive conductive film 31. Thus, the transparent diffractive conductive film 31 having the single-layer bridge structure can detect whether the diffractive element 30 is broken and the specific position of the breakage more accurately.

The light-transmitting diffractive conductive film 31 may have a single-layer structure. The structure of the transparent diffractive conductive film 31 having a single-layer structure is similar to that of the transparent collimating conductive film 21 having a single-layer structure, and thus, the description thereof is omitted.

The positions of the conductive elements 52 connecting the diffractive conductive electrode 32 with the circuit board 51 may be: a plurality of conductive elements 52 are attached to the inner surface of the sidewall 61 of the lens barrel 60, one end of each conductive element 52 is electrically connected to the diffraction input end 321 (including the diffraction input end 3211 of the first diffraction conductive electrode 323 and the diffraction input end 3212 of the second diffraction conductive electrode 324) or the diffraction output end 322 (including the diffraction output end 3221 of the first diffraction conductive electrode 323 and the diffraction output end 3222 of the second diffraction conductive electrode 324), and the other end is electrically connected to the circuit board 51 (as shown in fig. 8 and 11); alternatively, the sidewall 61 of the lens barrel 60 is provided with a groove 63 corresponding to the plurality of conductive elements 52, the plurality of conductive elements 52 are disposed in the corresponding groove 63, one end of each conductive element 52 is electrically connected to the diffraction input end 321 or the diffraction output end 322, and the other end is electrically connected to the circuit board 51 (as shown in fig. 12 and 13); alternatively, the sidewall 61 of the lens barrel 60 is axially opened with an annular hole 64, the plurality of conductive elements 52 are disposed in the annular hole 64, one end of each conductive element 52 is electrically connected to the diffraction input end 321 or the diffraction output end 322, and the other end is electrically connected to the circuit board 51 (as shown in fig. 14 and 15).

The conductive element 52 may be a crystal wire 521 or a spring piece 522.

For example, as shown in fig. 8 and 11, the conductive element 52 is a spring 522. The circuit board 51 is provided with a plurality of elastic pieces 522, and the lengths of the plurality of elastic pieces 522 extend towards the light emitting direction of the laser emitter 10. The plurality of elastic pieces 522 are attached to the inner surface of the sidewall 61 of the lens barrel 60, and the number of the elastic pieces 522 is twice of the number of the diffractive conductive electrodes 32. One end of each elastic sheet 522 is connected to the circuit board 51, and the other end is connected to the diffraction input end 321 or the diffraction output end 322. Specifically, one end of the partial elastic sheet 522 is connected to the first diffraction input end 3211, and the other end is connected to the circuit board 51; one end of the partial elastic sheet 522 is connected to the first diffraction output end 3221, and the other end is connected to the circuit board 51; one end of the partial elastic sheet 522 is connected to the second diffraction input terminal 3212, and the other end is connected to the circuit board 51; one end of the partial elastic sheet 522 is connected to the second diffractive output end 3222, and the other end is connected to the circuit board 51. The plurality of elastic pieces 522 are arranged at intervals, so that the plurality of elastic pieces 522 are insulated from each other, and the plurality of diffraction conductive electrodes 32 are insulated from each other. Of course, the remaining surface of each spring plate 522 except the contact position with the alignment input end 221 or the alignment output end 222 may be coated with an insulating material to further ensure the mutual insulation between the plurality of diffractive conductive electrodes 32.

As shown in fig. 12 and 13, the side wall 61 of the lens barrel 60 is provided with a groove 63 corresponding to the plurality of elastic pieces 522, and the plurality of elastic pieces 522 are disposed in the corresponding grooves 63. The positions of the elastic pieces 522 are in one-to-one correspondence with the positions of the diffraction input ends 321 and the diffraction output ends 322. The length of the elastic pieces 522 extends towards the light emitting direction of the laser emitter 10, and one end of each elastic piece 522 is in contact with the circuit board 51, and the other end is in direct contact with the diffraction input end 321 or the diffraction output end 322. Specifically, one end of the partial elastic sheet 522 is connected to the first diffraction input end 3211, and the other end is connected to the circuit board 51; one end of the partial elastic sheet 522 is connected to the first diffraction output end 3221, and the other end is connected to the circuit board 51; one end of the partial elastic sheet 522 is connected to the second diffraction input terminal 3212, and the other end is connected to the circuit board 51; one end of the partial elastic sheet 522 is connected to the second diffractive output end 3222, and the other end is connected to the circuit board 51.

As shown in fig. 14 and 15, the conductive element 52 is a crystal wire 521, the side wall 61 of the lens barrel 60 is provided with an annular hole 64 along the axial direction, and a plurality of crystal wires 521 are all accommodated in the annular hole 64. One end of the partial crystal line 521 is electrically connected to the diffraction input end 321, the other end is electrically connected to the circuit board 51, and one end of the remaining crystal line 521 is electrically connected to the diffraction output end 322 and the other end is electrically connected to the circuit board 51. The outer layer of the plurality of crystal lines 521 may be covered with a layer of insulating material, so as to avoid the problem that the plurality of diffraction conductive electrodes 32 are not insulated from each other due to the contact between the plurality of crystal lines 521.

Referring to fig. 16-19, in some embodiments, the conductive elements 52 are a plurality, and the detecting elements 70 are the alignment conductive particles 23 doped in the alignment element 20. The collimating conductive particles 23 form collimating conductive paths 24. At this time, the mechanism for judging whether the collimating element 20 is broken is as follows: when the collimating element 20 is in its intact state, adjacent collimating conductive particles 23 are engaged. At this time, the resistance of the whole collimating conductive path 24 is small, and in this state, the collimating conductive path 24 is energized, that is, a certain voltage is applied, so that the current output by the collimating conductive path 24 acquired by the processor 80 at this time is large. When the collimating element 20 is broken, the joint between the collimating conductive particles 23 doped in the collimating element 20 is broken, and at this time, the resistance of the whole collimating conductive path 24 approaches infinity, and in this state, the collimating conductive path 24 is energized, and the current output by the collimating conductive path 24 acquired by the processor 80 is small. Therefore, in the first mode, whether the collimating element 20 is broken or not can be determined according to the difference between the collimated electrical signal (i.e. current) output after the collimating conductive path 24 is energized and the collimated electrical signal detected when the collimating element 20 is in a broken state; the second mode is as follows: whether the collimating element 20 is broken or not can be directly judged according to the collimated electrical signal output after the collimating conductive path 24 is energized, specifically, if the collimated electrical signal is not within the preset collimation range, it is determined that the collimating element 20 is broken, and if the collimated electrical signal is within the preset collimation range, it is determined that the collimating element 20 is not broken.

Specifically, the collimating element 20 is doped with a plurality of collimating conductive particles 23, and the plurality of collimating conductive particles 23 form a plurality of collimating conductive paths 24 which are mutually non-intersecting and mutually insulated. The alignment of the conductive pathways 24 may be varied: for example, the extending direction of each collimating conductive via 24 is the length direction of the collimating element 20 (as shown in fig. 18); alternatively, the extending direction of each collimating conductive path 24 is the width direction of the collimating element 20 (not shown), and a plurality of collimating conductive paths 24 are arranged in parallel and spaced apart; alternatively, the extending direction of each collimating conductive path 24 is a diagonal direction (not shown) of the collimating incident surface 201, and the plurality of collimating conductive paths 24 are arranged in parallel at intervals; alternatively, the extending direction of each collimating conductive path 24 is a diagonal direction (not shown) of the collimating incident surface 201 and the collimating emergent surface 202, and the plurality of collimating conductive paths 24 are arranged along the parallel direction at intervals; alternatively, each of the collimating conductive paths 24 is spaced apart in parallel along the thickness of the collimating element 20 (not shown). No matter which of the above-mentioned arrangement modes of the collimating conductive paths 24 is, compared with the arrangement of a single collimating conductive path 24, a plurality of collimating conductive paths 24 can occupy more volume of the collimating element 20, and accordingly more collimating electrical signals can be output, and the processor 80 can more accurately judge whether the collimating element 20 is broken according to more collimating electrical signals, so as to improve the accuracy of the detection of the breakage of the collimating element 20. In other embodiments, the arrangement of the plurality of collimating conductive vias 24 may also be similar to the arrangement of the plurality of collimating conductive vias 24 in the diffraction element 30 described below, and will not be described herein.

The positions of the conductive elements 52 connecting the aligned conductive paths 24 to the circuit board 51 may be: a plurality of conductive elements 52 are attached to the inner surface of the sidewall 61 of the lens barrel 60, one end of each conductive element 52 is electrically connected to the collimation input end 241 or the collimation output end 242, and the other end is electrically connected to the circuit board 51 (as shown in fig. 16 and 19); alternatively, the sidewall 61 of the lens barrel 60 is provided with a groove 63 corresponding to the plurality of conductive elements 52, the plurality of conductive elements 52 are disposed in the corresponding groove 63, one end of each conductive element 52 is electrically connected to the collimation input end 241 or the collimation output end 242, and the other end is electrically connected to the circuit board 51 (as shown in fig. 20 and 21); alternatively, the sidewall 61 of the lens barrel 60 is axially provided with an annular hole 64, the plurality of conductive elements 52 are disposed in the annular hole 64, one end of each conductive element 52 is electrically connected to the collimation input end 241 or the collimation output end 242, and the other end is electrically connected to the circuit board 51 (as shown in fig. 22 and 23).

The conductive element 52 may be a crystal wire 521 or a spring piece 522.

For example, as shown in fig. 16 and 19, the conductive element 52 is a spring plate 522. The circuit board 51 is provided with a plurality of elastic pieces 522, and the lengths of the plurality of elastic pieces 522 extend towards the light emitting direction of the laser emitter 10. The plurality of elastic pieces 522 are attached to the inner surface of the sidewall 61 of the lens barrel 60, and the number of the elastic pieces 522 is twice the number of the collimating conductive paths 24. One end of each spring 522 is connected to the circuit board 51, and the other end is connected to the collimation input end 241 or the collimation output end 242. The plurality of elastic sheets 522 are arranged at intervals, so that the plurality of elastic sheets 522 are ensured to be insulated from each other, and the plurality of collimation conductive paths 24 are ensured to be insulated from each other. Of course, the remaining surface of each spring 522 except the contact position with the alignment input end 241 or the alignment output end 242 may be coated with an insulating material to further ensure the insulation between the plurality of alignment conductive paths 24.

As shown in fig. 20 and 21, the side wall 61 of the lens barrel 60 is provided with a groove 63 corresponding to the plurality of elastic pieces 522, and the plurality of elastic pieces 522 are disposed in the corresponding grooves 63. The positions of the elastic pieces 522 correspond to the positions of the plurality of collimation input ends 241 and the plurality of collimation output ends 242 one by one. The length of the elastic pieces 522 extends towards the light emitting direction of the laser emitter 10, and one end of each elastic piece 522 is in contact with the circuit board 51, and the other end is in direct contact with the collimation input end 241 or the collimation output end 242.

As shown in fig. 22 and 23, the conductive element 52 is a crystal wire 521, the side wall 61 of the lens barrel 60 is provided with an annular hole 64 along the axial direction, and a plurality of crystal wires 521 are all accommodated in the annular hole 64. One end of a part of the crystal wires 521 is electrically connected with the collimation input end 241, the other end of the part of the crystal wires 521 is electrically connected with the circuit board 51, one end of the other part of the crystal wires 521 is electrically connected with the collimation output end 242, and the other end of the other part of the crystal wires 521 is electrically connected with the circuit board 51. The outer layer of the plurality of die lines 521 may be coated with an insulating material, so as to avoid the problem that the plurality of die lines 521 contact each other to cause no mutual insulation between the plurality of aligned conductive vias 24.

Referring to fig. 24 to 27, in some embodiments, the number of the conductive elements 52 is multiple, the number of the detecting elements 70 is multiple diffraction conductive particles 33 doped in the diffraction element 30, and the multiple diffraction conductive particles 33 form the conductive path 34. The mechanism of whether the diffraction element 30 is broken or not is the same as the mechanism of judging whether the collimating element 20 is broken or not when the collimating element 20 is doped with the collimating conductive particles 23, and is not described in detail herein.

Specifically, the diffraction element 30 is doped with a plurality of diffractive conductive particles 33, the plurality of diffractive conductive particles 33 form a plurality of diffractive conductive paths 34, and each diffractive conductive path 34 includes a diffractive input end 341 and a diffractive output end 342. The plurality of diffractive conductive vias 34 includes a first plurality of diffractive conductive vias 343 and a second plurality of diffractive conductive vias 344. The plurality of first diffractive conductive vias 343 are disposed in parallel at intervals, and the plurality of second diffractive conductive vias 344 are disposed in parallel at intervals. Wherein the plurality of first diffractive conductive paths 343 and the plurality of second diffractive conductive paths 344 are spatially staggered, each first diffractive conductive path 343 includes a first diffractive input 3411 and a first diffractive output 3421, each second diffractive conductive path 344 includes a second diffractive input 3421 and a second diffractive output 3422, i.e., the diffractive input 341 includes a first diffractive input 3411 and a second diffractive input 3412, and the diffractive output 342 includes a first diffractive output 3421 and a second diffractive output 3422. Each first diffractive input 3411 and each first diffractive output 3421 are coupled to the processor 80 to form a diffractive conductive loop, and each second diffractive input 3412 and each second diffractive output 3422 are coupled to the processor 80 to form a diffractive conductive loop. Thus, both ends of the first plurality of diffractive conductive vias 343 are connected to the processor 80 to form a plurality of diffractive conductive loops, respectively, and both ends of the second plurality of diffractive conductive vias 344 are connected to the processor 80 to form a plurality of diffractive conductive loops, respectively. The plurality of first diffractive conductive vias 343 and the plurality of second diffractive conductive vias 344 are spatially crisscrossed, which means that the plurality of first diffractive conductive vias 343 and the plurality of second diffractive conductive vias 344 are spatially vertically crossed with each other, that is, the included angle between the first diffractive conductive vias 343 and the second diffractive conductive vias 344 is 90 degrees. At this time, the extending direction of the plurality of first diffractive conductive vias 343 is the longitudinal direction of the diffractive element 30, and the extending direction of the plurality of second diffractive conductive vias 344 is the width direction of the diffractive element 30 (as shown in fig. 26); alternatively, the extending direction of the plurality of first diffractive conductive vias 343 is the thickness direction of the diffractive element 30, and the extending direction of the plurality of second diffractive conductive vias 344 is the length direction of the diffractive element 30 (not shown). Of course, in other embodiments, the plurality of first diffractive conductive vias 343 and the plurality of second diffractive conductive vias 344 may be spatially criss-crossed, or the plurality of first diffractive conductive vias 343 and the plurality of second diffractive conductive vias 344 may be spatially obliquely criss-crossed with each other. In use, the processor 80 may simultaneously energize the first plurality of diffractive conductive paths 343 and the second plurality of diffractive conductive paths 344 to obtain a plurality of electrical signals. Alternatively, the processor 80 may sequentially energize the first plurality of diffractive conductive paths 343 and the second plurality of diffractive conductive paths 344 to obtain a plurality of diffractive electrical signals, and then the processor 80 determines whether the diffractive element 30 is broken according to the diffractive electrical signals. For example, when it is detected that the electrical signal output by the first diffractive conductive via 343, which is numbered (ii), is not within the preset diffraction range, and the electrical signal output by the second diffractive conductive via 344, which is numbered (iv), is not within the preset diffraction range, it is described that the diffraction element 30 is broken at the intersection of the first diffractive conductive via 343, which is numbered (ii), and the second diffractive conductive via 344, which is numbered (iv), and the corresponding position of the diffraction element 30 is also broken, so that whether the diffraction element 30 is broken and the specific broken position can be more accurately detected by arranging the plurality of first diffractive conductive vias 343 and the plurality of second diffractive conductive vias 344 in a criss-cross manner. In other embodiments, the arrangement of the plurality of diffractive conductive vias 34 may also be similar to the arrangement of the collimating conductive vias 24 in the collimating element 20, and will not be described again.

The positions of the conductive elements 52 connecting the diffractive conductive via 34 with the circuit board 51 may be: a plurality of conductive elements 52 are attached to the inner surface of the sidewall 61 of the barrel 60, one end of each conductive element 52 is electrically connected to the diffraction input end 341 (including the first diffraction input end 3411 and the second diffraction input end 3412) or the diffraction output end 342 (including the first diffraction output end 3421 and the second diffraction output end 3422), and the other end is electrically connected to the circuit board 51 (as shown in fig. 24 and 27); alternatively, the sidewall 61 of the lens barrel 60 is provided with a groove 63 corresponding to the plurality of conductive elements 52, the plurality of conductive elements 52 are disposed in the corresponding groove 63, one end of each conductive element 52 is electrically connected to the diffraction input end 341 or the diffraction output end 342, and the other end is electrically connected to the circuit board 51 (as shown in fig. 28 and 29); alternatively, a ring-shaped hole 64 is axially formed in the sidewall 61 of the lens barrel 60, the plurality of conductive elements 52 are disposed in the ring-shaped hole 64, one end of each conductive element 52 is electrically connected to the diffraction input end 341 or the diffraction output end 342, and the other end is electrically connected to the circuit board 51 (as shown in fig. 30 and 31).

The conductive element 52 may be a crystal wire 521 or a spring piece 522.

For example, as shown in fig. 24 and 27, the conductive element 52 is a spring plate 522. The circuit board 51 is provided with a plurality of elastic pieces 522, and the lengths of the plurality of elastic pieces 522 extend towards the light emitting direction of the laser emitter 10. The plurality of elastic pieces 522 are attached to the inner surface of the sidewall 61 of the lens barrel 60, and the number of the elastic pieces 522 is twice as many as the number of the diffractive conductive paths 34. One end of each elastic sheet 522 is connected to the circuit board 51, and the other end is connected to the diffraction input terminal 341 or the diffraction output terminal 342. Specifically, one end of the partial spring piece 522 is connected to the first diffraction input end 3411, and the other end is connected to the circuit board 51; one end of the partial elastic sheet 522 is connected to the first diffraction output end 3421, and the other end is connected to the circuit board 51; one end of the partial spring piece 522 is connected to the second diffraction input end 3412, and the other end is connected to the circuit board 51; one end of the partial elastic sheet 522 is connected to the second diffraction output end 3422, and the other end is connected to the circuit board 51. The plurality of elastic pieces 522 are arranged at intervals, so that the plurality of elastic pieces 522 are ensured to be insulated from each other, and the plurality of diffraction conductive paths 34 are ensured to be insulated from each other. Of course, the remaining surface of each spring 522 except the contact position with the diffraction input end 341 or the diffraction output end 342 may be coated with an insulating material to further ensure the insulation between the plurality of diffraction conductive paths 34.

As shown in fig. 28 and 29, the side wall 61 of the lens barrel 60 is provided with grooves 63 corresponding to the plurality of elastic pieces 522, and the plurality of elastic pieces 522 are disposed in the corresponding grooves 63. The positions of the elastic pieces 522 are in one-to-one correspondence with the positions of the plurality of diffraction input ends 341 and the plurality of diffraction output ends 342. The length of the elastic pieces 522 extends toward the light emitting direction of the laser emitter 10, and one end of each elastic piece 522 is in contact with the circuit board 51, and the other end is in direct contact with the diffraction input end 341 or the diffraction output end 342. Specifically, one end of the partial spring piece 522 is connected to the first diffraction input end 3411, and the other end is connected to the circuit board 51; one end of the partial elastic sheet 522 is connected to the first diffraction output end 3421, and the other end is connected to the circuit board 51; one end of the partial spring piece 522 is connected to the second diffraction input end 3412, and the other end is connected to the circuit board 51; one end of the partial elastic sheet 522 is connected to the second diffraction output end 3422, and the other end is connected to the circuit board 51.

As shown in fig. 30 and 31, the conductive element 52 is a crystal wire 521, the side wall 61 of the lens barrel 60 is provided with an annular hole 64 along the axial direction, and a plurality of crystal wires 521 are all accommodated in the annular hole 64. One end of the partial crystal line 521 is electrically connected to the first diffraction input end 3411, and the other end is electrically connected to the circuit board 51; one end of the partial crystal line 521 is electrically connected to the first diffraction output end 3421, and the other end is electrically connected to the circuit board 51; one end of the partial crystal line 521 is electrically connected to the second diffraction input end 3412, and the other end is electrically connected to the circuit board 51; one end of the partial crystal line 521 is electrically connected to the second diffraction output terminal 3422, and the other end is electrically connected to the circuit board 51. The outer layer of the plurality of crystal lines 521 may be covered with an insulating material, so as to avoid the problem that the plurality of diffraction conductive paths 34 are not insulated from each other due to the contact between the plurality of crystal lines 521.

Referring to fig. 32, in some embodiments, a light-transmissive collimating conductive film 21 is disposed on the collimating incident surface 201 of the collimating element 20, a plurality of collimating conductive electrodes 22 disposed in parallel are disposed on the light-transmissive collimating conductive film 21, a plurality of diffractive conductive particles 33 are doped in the diffractive element 30, and a plurality of diffractive conductive paths 34 are formed by the plurality of diffractive conductive particles 33 and are parallel and insulated from each other. The conductive elements 52 are crystal wires 52. A ring-shaped hole 64 is formed in the side wall 61 of the lens barrel 60 along the axial direction, a plurality of crystal lines 5212 (hereinafter referred to as "alignment crystal lines 5212") respectively connecting the plurality of alignment conductive electrodes 22 and the circuit board 51 are attached to the inner surface of the side wall 61 of the lens barrel 60, and a plurality of diffraction conductive paths 34 (hereinafter referred to as "diffraction crystal lines 5211") respectively connecting the plurality of diffraction conductive paths 34 and the circuit board 51 are accommodated in the ring-shaped hole 64. Specifically, one end of a part of the alignment crystal lines 5212 is electrically connected to the alignment input terminal 221, the other end is electrically connected to the circuit board 51, and one end of the remaining part of the alignment crystal lines 5212 is electrically connected to the alignment output terminal 222, and the other end is electrically connected to the circuit board 51. One end of a part of the diffraction crystal lines 5211 is connected to the diffraction input terminal 321, and the other end is electrically connected to the circuit board 51, and one end of the remaining part of the diffraction crystal lines 5211 is connected to the diffraction output terminal 322, and the other end is connected to the circuit board 51. The collimating conductive electrodes 22 on the collimating element 20 may output the collimated electrical signals to the processor 80 through the collimating crystal lines 5212, and the diffractive conductive pathways 34 on the diffractive element 30 may output the diffractive electrical signals to the processor 80 through the diffractive crystal lines 5211. In this way, the processor 80 may detect whether not only the collimating element 20 is broken, but also the diffractive element 30 is broken, and immediately turn off the laser emitter 10 or reduce the emission power of the laser emitter 10 when any one of the collimating element 20 and the diffractive element 30 is broken, so as to avoid harming human eyes.

Referring to fig. 33, in some embodiments, the circuit board assembly 50 further includes a substrate 53, and the circuit board 51 is carried on the substrate 53. The circuit board 51 may be a hard board, a soft board, or a rigid-flex board. The circuit board 51 is provided with a via 511, and the laser emitter 10 is carried on the substrate 53 and is accommodated in the via 511. The laser transmitter 10 is electrically connected to the processor 80 via the circuit board 51. The substrate 53 is further provided with a heat dissipation hole 531, heat generated by the operation of the laser transmitter 10 or the circuit board 51 can be dissipated through the heat dissipation hole 531, and the heat dissipation hole 531 can be filled with heat conducting glue to further improve the heat dissipation performance of the substrate 53.

The Laser transmitter 10 may be a Vertical Cavity Surface Emitting Laser (VCSEL) or an edge-Emitting Laser (EEL), and in the embodiment shown in fig. 33, the Laser transmitter 10 is an edge-Emitting Laser, and specifically, the Laser transmitter 10 may be a Distributed Feedback Laser (DFB). The laser emitter 10 is used for emitting laser into the housing cavity 62. Referring to fig. 34, the laser emitter 10 is in a column shape, an end surface of the laser emitter 10 away from the substrate 53 forms a light emitting surface 11, the laser is emitted from the light emitting surface 11, and the light emitting surface 11 faces the collimating element 20. The laser emitter 10 is fixed on the substrate 53, and specifically, the laser emitter 10 may be adhered to the substrate 53 by the sealant 15, for example, the surface of the laser emitter 10 opposite to the light emitting surface 11 is adhered to the substrate 53. Referring to fig. 33 and 35, the side 12 of the laser emitter 10 may be bonded to the substrate 53, and the sealant 15 may cover the sides around the side, or only one side of the side may be bonded to the substrate 53, or some sides may be bonded to the substrate 53. The encapsulant 15 may be a thermal conductive encapsulant to conduct heat generated by the operation of the laser emitter 10 to the substrate 53.

Laser projection module 100 adopts the limit transmission laser as laser emitter 10, and the temperature of limit transmission laser than the VCSEL array floats for a short time on the one hand, and on the other hand, because the limit transmission laser is single-point luminous structure, need not to design array structure, simple manufacture, laser projection module 100's cost is lower.

When the laser of the distributed feedback laser propagates, the gain of power is obtained through the feedback of the grating structure. To improve the power of the distributed feedback laser, the injection current needs to be increased and/or the length of the distributed feedback laser needs to be increased, which may increase the power consumption of the distributed feedback laser and cause serious heat generation. When the light emitting surface 11 of edge-emitting laser was towards collimating element 20, edge-emitting laser was vertical and placed, because edge-emitting laser is the elongated structure, edge-emitting laser appears easily and falls, shifts or rocks the scheduling accident, consequently seals glue 15 through the setting and can fix edge-emitting laser, prevents that edge-emitting laser from taking place to fall, shift or rock the scheduling accident.

Referring to fig. 33 and 36, in some embodiments, the laser emitter 10 can also be fixed on the substrate 53 by using the fixing method shown in fig. 36. Specifically, the laser projection module 100 includes a plurality of supports 16, and the supports 16 may be fixed on the base plate 53. The plurality of supports 16 enclose a receiving space 160, and the laser emitter 10 is received in the receiving space 160 and supported by the plurality of supports 16. The laser transmitter 10 may be mounted directly between the plurality of supports 16 at the time of installation. In one example, the plurality of supports 16 collectively grip the laser emitting device 10 to further prevent the laser emitting device 10 from wobbling.

In some embodiments, the substrate 53 may be omitted and the laser emitter 10 may be directly mounted on the circuit board 51 to reduce the overall thickness of the laser projection module 100.

Referring to fig. 37, the present invention further provides a depth camera 1000. The depth camera 1000 according to an embodiment of the present invention includes the laser projection module 100 according to any one of the above embodiments, the image collector 200, and the processor 80. The image collector 200 is configured to collect a laser pattern projected into a target space after being diffracted by the diffraction element. The processor 80 is connected to the laser projection module 100 and the image collector 200 respectively. The processor 80 is used to process the laser pattern to acquire a depth image. The processor 80 here may be the processor 80 in the laser projection module.

Specifically, the laser projection module 100 projects a laser pattern into the target space through the projection window 901, and the image collector 200 collects the laser pattern modulated by the target object through the collection window 902. The image collector 200 may be an infrared camera, and the processor 80 calculates a deviation value between each pixel point in the laser pattern and each corresponding pixel point in the reference pattern by using an image matching algorithm, and further obtains a depth image of the laser pattern according to the deviation value. The Image matching algorithm may be a Digital Image Correlation (DIC) algorithm. Of course, other image matching algorithms may be employed instead of the DIC algorithm.

Referring to fig. 1 and 38, an electronic device 3000 according to an embodiment of the invention includes a housing 2000 and a depth camera 1000 according to the above embodiment. The depth camera 1000 is disposed within the housing 2000 and exposed from the housing 2000 to acquire a depth image.

The laser projection module 100 according to the embodiment of the invention is configured to dispose the detection element 70 on the optical assembly 40, and electrically connect the detection element 70 with the circuit board 51 by using the conductive element, so that the processor 80 can receive the electrical signal output by the detection element 70 to determine whether the optical assembly 40 is broken according to the electrical signal. After detecting that the optical component 40 is broken, the laser emitter 10 is turned off or the power of the laser emitter 10 is reduced in time, so as to avoid the problem that the eyes of the user are injured due to the fact that the laser energy emitted by the broken optical component 40 is too large, and improve the safety of the laser projection module 100 in use.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The utility model provides a laser projection module, its characterized in that, laser projection module includes:

a diffractive element;

a detection element disposed at the diffraction element;

a lens barrel at which the diffraction element is disposed;

a circuit board on which the lens barrel is disposed; and

and the conductive element is arranged on the side wall of the lens barrel and is connected with the detection element and the circuit board.

2. The laser projection module of claim 1, wherein the sidewall defines an aperture, and the conductive element extends through the aperture to connect the sensing element to the circuit board.

3. The laser projection module of claim 1, wherein the detection element comprises a transparent conductive film disposed on the collimating element or a plurality of diffractive conductive particles doped in the diffractive element, the plurality of diffractive conductive particles forming a conductive path.

4. The laser projection module of claim 2, wherein the transparent conductive film is a transparent diffractive conductive film, the conductive electrode on the transparent diffractive conductive film is a diffractive conductive electrode, the diffractive conductive electrode comprises a diffractive input end and a diffractive output end, the diffractive input end is connected to the circuit board through one of the conductive elements, and the diffractive output end is connected to the circuit board through the other conductive element.

5. The laser projection module of claim 1, wherein the conductive element comprises a plurality of crystal lines, and the crystal lines are insulated from each other.

6. The laser projection module of claim 5, wherein any two adjacent crystal lines of the plurality of crystal lines are spaced apart from each other.

7. The laser projection module of claim 5, wherein an outer layer of the crystal wire is coated with an insulating material.

8. The laser projection module of claim 1, wherein the conductive element comprises a plurality of spring plates.

9. The laser projection module of claim 1, further comprising a processor coupled to the circuit board, the processor configured to receive a plurality of electrical diffraction signals output by the detection element to determine whether the diffraction element is broken.

10. A depth camera, characterized in that the depth camera comprises:

the laser projection module of any one of claims 1 to 9;

the image collector is used for collecting the laser patterns projected into the target space by the laser projection module; and

the processor is configured to process the laser light pattern to obtain a depth image.

11. An electronic device, comprising:

a housing; and

the depth camera of claim 10, disposed within and exposed from the housing to acquire a depth image.