CN108196418A - Laser projection module, depth camera and electronic device - Google Patents

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 electronics

technical field

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

Background technique

Some existing laser transmitters emit lasers with strong focused signals, and the energy of these lasers will be attenuated after passing through collimation elements and diffraction elements, so that the signal strength is lower than the threshold of harm to the human body. These laser emitters are usually composed of glass or other easily broken parts. Once the lens is broken in case of falling, the laser will be emitted directly to irradiate the user's body or eyes, causing serious safety problems.

Contents of the invention

Embodiments of the present invention provide a laser projection module, a depth camera and an electronic device.

The laser projection module according to the embodiment of the present invention includes a laser emitter, an optical component, a circuit board component and a processor connected to the circuit board component. Laser emitters are used to emit laser light. The optical assembly is arranged on the light-emitting optical path of the laser emitter, and the laser light forms a laser pattern after passing through the optical assembly, and a detection element is arranged on the optical assembly. The circuit board assembly includes a circuit board and a conductive element, the detection element is electrically connected to the circuit board through the conductive element, and the laser emitter is arranged on the circuit board assembly. The processor is used for receiving the electrical signal output by the detection element to determine whether the optical component is broken.

The depth camera according to the embodiment of the present invention includes the above-mentioned laser projection module, an image collector and a processor. The image collector is used to collect the laser pattern projected by the laser projection module into the target space, and the processor is used to process the laser pattern to obtain a depth image.

An electronic device according to an embodiment of the present invention includes a housing and the aforementioned depth camera. The depth camera is disposed within and exposed from the housing to acquire depth images.

The laser projection module, the depth camera and the electronic device in the embodiment of the present invention set the detection element on the optical assembly, and use the conductive element to electrically connect the detection element to the circuit board, so that the processor can receive the electrical signal output by the detection element, It can judge whether the optical component is broken according to the electrical signal. After detecting the rupture of the optical component, turn off the laser transmitter or reduce the power of the laser transmitter in time to avoid the problem of excessive laser energy emitted by the rupture of the optical component and damage the user's eyes, and improve the safety of the laser projection module. sex.

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

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic structural diagram of a laser projection module in some embodiments of the present invention.

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

Fig. 3 is a schematic circuit diagram of collimating conductive electrodes according to some embodiments of the present invention.

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

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

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

FIG. 7 is a schematic cross-sectional view of the laser projection module in FIG. 6 along line VII-VII.

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

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

Fig. 10 is a schematic circuit diagram of a diffractive conductive electrode according to some embodiments of the present invention.

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

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

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

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

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

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

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

Figure 18 is a circuit diagram of a collimating conductive path according to some embodiments of the present invention.

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

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

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

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

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

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

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

Figure 26 is a schematic circuit diagram of a diffractive conductive pathway according to some embodiments of the present invention.

FIG. 27 is a schematic cross-sectional view of the laser projection module in FIG. 24 along line XXVII-XXVII.

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

FIG. 29 is a schematic cross-sectional view of the laser projection module in FIG. 28 along line XXIX-XXIX.

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

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

FIG. 32 and FIG. 33 are structural schematic diagrams of laser projection modules in some embodiments of the present invention.

34 to 36 are partial structural schematic diagrams of the laser projection module in some embodiments of the present invention.

Fig. 37 is a schematic structural diagram of a depth camera in some embodiments of the present invention.

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

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "first" and "second" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; may be mechanically connected, may be electrically connected or may communicate with each other; may be directly connected, or indirectly connected through an intermediary, may be internal communication between two components or interaction between two components relation. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

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

Please refer to FIG. 1 and FIG. 2 together. The laser projection module 100 according to the embodiment of the present invention includes a laser emitter 10 , an optical component 40 , a circuit board component 50 and a processor 80 . The laser emitter 10 is used to emit laser light, and the optical assembly 40 is arranged on the light-emitting optical path of the laser emitter 10 , and the laser light forms a laser pattern after passing through the optical assembly 40 . A detection element 70 is disposed on the optical assembly 40 . The circuit board assembly 50 includes a circuit board 51 and conductive elements 52 . The detection element 70 is electrically connected to the circuit board 51 through the conductive element 52 . The laser emitter 10 is disposed on the circuit board assembly 50 . The processor 80 is connected to the circuit board 51 . The processor 80 is configured to receive the electrical signal output by the detection element 70 to determine whether the optical assembly 40 is broken.

The laser projection module 100 also includes a lens barrel 60 . The lens barrel 60 is disposed on the circuit board 51 and encloses a receiving chamber 62 with the circuit board 51 . The laser emitter 10 is accommodated in the accommodation cavity 62 . The optical assembly 40 includes a diffractive element 30 and a collimating element 20 accommodated in the receiving cavity 62 . The collimation element 20 and the diffraction element 30 are arranged in sequence along the light emitting path of the laser emitter 10 . Wherein, the collimation element 20 is used to collimate the laser light emitted by the laser emitter 10 . The diffraction element 30 is used to diffract the laser collimated by the collimation element 20 to form a laser pattern.

The laser projection module 100 of the embodiment of the present invention arranges the detection element 70 on the optical assembly 40, and uses the conductive element 52 to electrically connect the detection element 70 to the circuit board 51, so that the processor 80 can receive the electrical output from the detection element 70. signal, so as to judge whether the optical component 40 is broken according to the electrical signal. After detecting that the optical assembly 40 is broken, turn off the laser emitter 10 or reduce the power of the laser emitter 10 in time, so as to avoid the problem that the emitted laser energy is too large and damage the user's eyes due to the rupture of the optical assembly 40, and improve the laser projection mode. Security used by group 100.

Please refer to FIG. 1 to FIG. 3 together. In some embodiments, there are multiple conductive elements 52 , and the detection element 70 is a light-transmitting and collimating conductive film 21 . A light-transmitting and collimating conductive film 21 is disposed on the collimating element 20 , and a collimating conductive electrode 22 is disposed on the light-transmitting and collimating conductive film 21 . The judging mechanism of whether the collimation element 20 is broken or not is as follows: when the collimation element 20 is in a good state, the resistance of the light-transmitting collimating conductive film 21 is small, and in this state, the light-transmitting collimating conductive film 21 is energized, that is, an electric current is applied. For a voltage of a certain magnitude, the output current of the collimated conductive electrode 22 acquired by the processor 80 at this time is relatively large. And when the collimating element 20 is broken, the light-transmitting and collimating conductive film 21 formed on the collimating element 20 will also be fragmented. At this time, the resistance value of the light-transmitting and collimating conductive film 21 at the cracked position is close to infinity. In this state, the collimating conductive electrode 22 on the light-transmitting collimating conductive film 21 is energized, and the output current of the collimating conductive electrode 22 obtained by the processor 80 is relatively small. Therefore, in the first way, it can be judged whether the collimation element 20 is broken according to the difference between the collimation electric signal (ie current) and the collimation electric signal (ie current) detected in the unbroken state of the collimation element 20 , further, it is possible to judge whether the collimating element 20 is broken according to the state of the light-transmitting collimating conductive film 21, that is, if the light-transmitting collimating conductive film 21 breaks, then it shows that the collimating element 20 is also broken; If the conductive film 21 is not broken, it means that the collimation element 20 is not broken either. The second way: it can be directly judged whether the collimation element 20 is broken according to the collimation electric signal output by the collimation conductive electrode 22 on the collimation element 20 after being energized. When setting the collimation range, it is determined that the collimation element 20 is broken, and then it is judged that the collimation element 20 is also broken; if the collimation electrical 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 then it is judged that the collimation element 20 is not broken.

The light-transmissive and collimating conductive film 21 can be formed on the surface of the collimating element 20 by means of electroplating or the like. The material of the light-transmitting and collimating conductive film 21 may be any one of indium tin oxide (ITO), nano-silver wire, and metallic silver wire. Indium tin oxide, nano-silver wires, and metal silver wires all have good light transmittance and electrical conductivity, and can realize collimated electrical signal output after power-on without blocking the light-emitting optical path of the collimating element 20 .

Specifically, the collimating element 20 includes a collimating incident surface 201 and a collimating outgoing 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 outgoing surface 202 . Multiple collimating conductive electrodes 22 are arranged on the light-transmitting collimating conductive film 21 , and the multiple collimating conductive electrodes 22 do not intersect each other. Each collimating conductive electrode 22 includes a collimating input terminal 221 and a collimating output terminal 222 . Each collimating input terminal 221 and each collimating output terminal 222 are connected to the processor 80 to form a collimating conductive loop, thus, the collimating input terminals 221 and the collimating output terminals of a plurality of collimating conductive electrodes 22 222 are respectively connected to the processor 80 to form a plurality of collimating conductive loops. Among them, there are many ways to arrange the multiple collimating conductive electrodes 22. For example, the extension direction of each collimating conductive electrode 22 is the length direction of the light-transmitting collimating conductive film 21, and the multiple collimating conductive electrodes 22 are spaced in parallel. set (as shown in Figure 3); or, the extension direction of each collimated conductive electrode 22 is the width direction of the light-transmitting collimated conductive film 21, and a plurality of collimated conductive electrodes 22 are arranged in parallel and spaced apart (not shown); or , the extending direction of the plurality of collimating conductive electrodes 22 is the diagonal direction of the light-transmitting collimating conductive film 21 , and the plurality of collimating conductive electrodes 22 are arranged in parallel and at intervals (not shown in the figure). No matter which way the collimating conductive electrodes 22 are arranged, compared with setting a single collimating conductive electrode 22, multiple collimating conductive electrodes 22 can occupy more area of the light-transmitting collimating conductive film 21 Correspondingly, more collimated electric signals can be output, and the processor 80 can more accurately judge whether the light-transmitting collimated conductive film 21 is broken according to more collimated electric signals, and further judge whether the collimating element 20 is broken, The accuracy of the collimation element 20 rupture detection is improved. The light-transmitting and collimating conductive film 21 can also be a single-layer bridging structure, and the light-transmitting and collimating conductive film 21 of the single-layer bridging structure is similar to the light-transmitting diffractive conductive film 31 of the single-layer bridging structure arranged on the diffraction element 30 The light-transmitting diffractive conductive film 31 with a single-layer bridging structure will be described below, therefore, the light-transmitting and collimating conductive film 21 with a single-layer bridging structure will not be developed in detail here.

The position of the conductive element 52 connecting the collimation conductive electrode 22 and the circuit board 51 can be: a plurality of conductive elements 52 are attached to the inner surface of the side wall 61 of the lens barrel 60, and one end of each conductive element 52 is connected to the collimation input end. 221 or the collimation output end 222 is electrically connected, and the other end is electrically connected with the circuit board 51 (as shown in Figure 1 and Figure 2); or, the side wall 61 of the lens barrel 60 is provided with a plurality of conductive elements 52 Groove 63, a plurality of conductive elements 52 are arranged 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 Figure 4 and Figure 5); or, the side wall 61 of lens barrel 60 is provided with an annular hole 64 along the axial direction, and a plurality of conductive elements 52 are all arranged in the annular hole 64, and one end of each conductive element 52 It 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 FIG. 7 ).

Wherein, the conductive element 52 may be a crystal wire 521 or a shrapnel 522 .

For example, as shown in FIGS. 1 and 2 , the conductive element 52 is a shrapnel 522 . A plurality of shrapnels 522 are arranged on the circuit board 51 , and the lengths of the shrapnels 522 extend toward the light emitting direction of the laser emitter 10 . A plurality of elastic sheets 522 are attached to the inner surface of the side wall 61 of the lens barrel 60 , and the number of elastic sheets 522 is twice the number of collimating conductive electrodes 22 . One end of each shrapnel 522 is connected to the circuit board 51 , and the other end is connected to the collimation input end 221 or the collimation output end 222 . The multiple shrapnels 522 are spaced apart from each other, so as to ensure that the multiple shrapnels 522 are insulated from each other, thereby ensuring that the multiple alignment conductive electrodes 22 are insulated from each other. Of course, a layer of insulating material can also be coated on the remaining surface of each shrapnel 522 except for the contact position with the collimation input end 221 or the collimation output end 222, so as to further ensure that the plurality of collimation conductive electrodes 22 are insulated from each other. .

As shown in FIG. 4 and FIG. 5 , the side wall 61 of the lens barrel 60 defines grooves 63 corresponding to the multiple elastic pieces 522 , and the multiple 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 multiple collimation input ends 221 and the multiple collimation output ends 222 . The length of the shrapnel 522 extends toward the light emitting direction of the laser emitter 10 , one end of each shrapnel 522 contacts the circuit board 51 , and the other end contacts the collimation input end 221 or the collimation output end 222 .

As shown in FIGS. 6 and 7 , the conductive element 52 is a crystal wire 521 , and the side wall 61 of the lens barrel 60 defines an annular hole 64 along the axial direction, and a plurality of crystal wires 521 are accommodated in the annular hole 64 . Wherein, one end of some crystal lines 521 is electrically connected to the collimation input end 221, and the other end is electrically connected to the circuit board 51; connect. The outer layer of the plurality of crystal wires 521 can be coated with a layer of insulating material, so as to avoid the problem that the plurality of crystal wires 521 are in contact with each other and the multiple collimating conductive electrodes 22 are not insulated from each other.

In addition, the crystal wire 521 can also be attached to the inner surface of the lens barrel 60 , or set in the groove 63 opened on the side wall 61 of the lens barrel 60 ; the elastic piece can also be accommodated in the annular hole 64 .

Please refer to FIGS. 8 to 11 together. In some embodiments, there are multiple conductive elements 52 , and the detection element 70 is a light-transmitting diffractive conductive film 31 . The light-transmitting diffractive conductive film 31 is disposed on the diffractive element 30 . A diffractive conductive electrode 32 is disposed on the light-transmitting diffractive conductive film 31 . The judging mechanism of whether the diffractive element 30 is cracked or not is the same as that of the collimating element 20 provided with the light-transmitting collimating conductive film 21 , and will not be repeated here. The material of the light-transmitting diffractive conductive film 31 is also the same as that of the light-transmissive collimating conductive film 21 , which will not be repeated here.

Specifically, the diffractive element 30 includes a diffractive incident surface 301 and a diffractive exit surface 302 , and the light-transmitting diffractive conductive film 31 is a single-layer bridging structure and is disposed on the diffractive exit surface 302 . A plurality of diffractive conductive electrodes 32 are arranged on the light-transmitting diffractive conductive film 31 with a single-layer bridging structure. The plurality of diffractive conductive electrodes 32 includes a plurality of first diffractive conductive electrodes 323 spaced in parallel, a plurality of second diffractive conductive electrodes 324 spaced in parallel and a plurality of bridged diffractive conductive electrodes 325 . A plurality of first diffractive conductive electrodes 323 and a plurality of second diffractive conductive electrodes 324 criss-cross, each first diffractive conductive electrode 323 is continuous and uninterrupted, and each second diffractive conductive electrode 324 is connected to the corresponding first diffractive conductive electrode 323 The intersections are disconnected and not connected to the plurality of first diffractive conductive electrodes 323 . Each bridging diffractive conductive electrode 325 conducts the disconnection of the corresponding second diffractive conductive electrode 324 . A diffractive insulator 326 is provided at the intersection of the bridging diffractive conductive electrode 325 and the first diffractive conductive electrode 323 . The two ends of each first diffractive conductive electrode 323 are connected to the processor 80 to form a diffractive conductive loop, and the two ends of each second diffractive conductive electrode 324 are connected to the processor 80 to form a diffractive conductive loop. The two ends of the first diffractive conductive electrodes 323 are respectively connected to the processor 80 to form multiple diffractive conductive loops, and the two ends of the multiple second diffractive conductive electrodes 324 are respectively connected to the processor 80 to form multiple diffractive conductive loops . Wherein, the material of the diffractive insulator 326 may be an organic material with good light transmittance and insulation properties, and the diffractive insulator 326 may be manufactured by silk screen or yellow light process. A plurality of first diffractive conductive electrodes 323 and a plurality of second diffractive conductive electrodes 324 criss-cross means that a plurality of first diffractive conductive electrodes 323 and a plurality of second diffractive conductive electrodes 324 are perpendicular to each other, that is, the first diffractive conductive electrodes 323 The included angle with the second diffractive conductive electrode 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 crisscross, or the plurality of first diffractive conductive electrodes 323 and the plurality of second diffractive conductive electrodes 324 are obliquely interlaced. . When in use, the processor 80 can simultaneously energize multiple first diffractive conductive electrodes 323 and multiple second diffractive conductive electrodes 324 to obtain multiple diffractive electrical signals, or the processor 80 can sequentially energize multiple first diffractive conductive electrodes 324 323 and the plurality of second diffractive conductive electrodes 324 are energized to obtain a plurality of diffractive electrical signals, and then the processor 80 judges whether the light-transmitting diffractive conductive film 31 is broken according to the diffractive electrical signals. For example, when it is detected that the diffraction electrical signal output by the first diffractive conductive electrode 323 numbered ① is not within the preset diffraction range, and the diffraction electrical signal output by the second diffractive conductive electrode 324 numbered ③ is not within the preset diffraction range, It shows that the light-transmitting diffractive conductive film 31 breaks at the intersection of the first diffractive conductive electrode 323 numbered ① and the second diffractive conductive electrode 324 numbered ③. rupture. In this way, the light-transmitting diffractive conductive film 31 with a single-layer bridging structure can more accurately detect whether the diffractive element 30 is cracked and the specific location of the crack.

The light-transmitting diffractive conductive film 31 can also be a single-layer structure. The structure of the light-transmitting diffractive conductive film 31 with a single-layer structure is similar to the structure of the light-transmissive collimating conductive film 21 with a single-layer structure, and will not be repeated here.

The position of the conductive element 52 connecting the diffractive conductive electrode 32 and the circuit board 51 can be: a plurality of conductive elements 52 are attached to the inner surface of the side wall 61 of the lens barrel 60, and one end of each conductive element 52 is connected to the diffractive input end 321 ( Including the diffraction input end 3211 of the first diffractive conductive electrode 323 and the diffractive input end 3212 of the second diffractive conductive electrode 324) or the diffractive output end 322 (including the diffractive output end 3221 of the first diffractive conductive electrode 323 and the second diffractive conductive electrode 324 The diffraction output end 3222) is electrically connected, and the other end is electrically connected to the circuit board 51 (as shown in FIG. 8 and FIG. 11); or, the side wall 61 of the lens barrel 60 is provided with concave holes corresponding to the plurality of conductive elements 52. groove 63, a plurality of conductive elements 52 are arranged in the corresponding groove 63, one end of each conductive element 52 is electrically connected with the diffraction input end 321 or the diffraction output end 322, and the other end is electrically connected with the circuit board 51 (as shown 12 and shown in Figure 13); or, the side wall 61 of lens barrel 60 is provided with an annular hole 64 along the axial direction, and a plurality of conductive elements 52 are all arranged in the annular hole 64, and one end of each conductive element 52 is connected with the diffraction input The end 321 or the diffraction output end 322 are electrically connected, and the other end is electrically connected to the circuit board 51 (as shown in FIG. 14 and FIG. 15 ).

Wherein, the conductive element 52 may be a crystal wire 521 or a shrapnel 522 .

For example, as shown in FIG. 8 and FIG. 11 , the conductive element 52 is a shrapnel 522 . A plurality of shrapnels 522 are arranged on the circuit board 51 , and the lengths of the shrapnels 522 extend toward the light emitting direction of the laser emitter 10 . A plurality of shrapnels 522 are attached to the inner surface of the side wall 61 of the lens barrel 60 , and the number of shrapnels 522 is twice the number of diffractive conductive electrodes 32 . One end of each shrapnel 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 a part of the elastic piece 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 part of the elastic piece 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 shrapnel 522 is connected to the second diffraction output end 3222 and the other end is connected to the circuit board 51 . The plurality of shrapnels 522 are spaced apart from each other, so as to ensure that the plurality of shrapnels 522 are insulated from each other, thereby ensuring that the plurality of diffractive conductive electrodes 32 are insulated from each other. Of course, a layer of insulating material can also be coated on the remaining surface of each shrapnel 522 except the contact position with the collimation input end 221 or the collimation output end 222 , so as to further ensure the mutual insulation between the plurality of diffractive conductive electrodes 32 .

As shown in FIG. 12 and FIG. 13 , the side wall 61 of the lens barrel 60 is provided with grooves 63 corresponding to the multiple elastic pieces 522 , and the multiple elastic pieces 522 are disposed in the corresponding grooves 63 . The positions of the shrapnel 522 are in one-to-one correspondence with the positions of the plurality of diffraction input ends 321 and the plurality of diffraction output ends 322 . The length of the shrapnel 522 extends toward the light emitting direction of the laser emitter 10 , and one end of each shrapnel 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 a part of the elastic piece 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 part of the elastic piece 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 shrapnel 522 is connected to the second diffraction output end 3222 and the other end is connected to the circuit board 51 .

As shown in FIG. 14 and FIG. 15 , the conductive element 52 is a crystal wire 521 , and the side wall 61 of the lens barrel 60 defines an annular hole 64 in the axial direction, and a plurality of crystal wires 521 are accommodated in the annular hole 64 . One end of some crystal wires 521 is electrically connected to the diffraction input end 321, and the other end is electrically connected to the circuit board 51; one end of the rest of the crystal wires 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 wires 521 can be covered with a layer of insulating material, so as to avoid the problem that the plurality of crystal wires 521 are in contact with each other and the plurality of diffractive conductive electrodes 32 are not insulated from each other.

In addition, the crystal wire 521 can also be attached to the inner surface of the lens barrel 60 , or set in the groove 63 opened on the side wall 61 of the lens barrel 60 ; the elastic piece can also be accommodated in the annular hole 64 .

Please refer to FIG. 16 to FIG. 19 together. In some embodiments, there are multiple conductive elements 52 , and the detection element 70 is collimated conductive particles 23 doped in the collimation element 20 . Aligned conductive particles 23 form an aligned conductive path 24 . At this time, the judging mechanism of whether the collimating element 20 is broken is as follows: when the collimating element 20 is in a good state, adjacent collimating conductive particles 23 are bonded. At this time, the resistance of the entire collimated conductive path 24 is relatively small. In this state, the collimated conductive path 24 is energized, that is, a voltage of a certain size is applied, and the output current of the collimated conductive path 24 obtained by the processor 80 is relatively small. big. And when the collimating element 20 was broken, the junction between the collimating conductive particles 23 doped in the collimating element 20 was disconnected. At this moment, the resistance of the entire collimating conductive path 24 was close to infinity. The path 24 is energized, and the output current of the collimated conductive path 24 obtained by the processor 80 is relatively small. Therefore, in the first way, the collimation can be judged according to the difference between the collimation electrical signal (i.e. current) output after the collimation conductive path 24 is energized and the collimation electrical signal detected when the collimation element 20 is in a broken state. Whether the collimating element 20 is broken; the second method: it can be directly judged whether the collimating element 20 is broken according to the collimating electrical signal output after the collimating conductive path 24 is energized, specifically, if the collimating electrical signal is not within the preset collimating range It is determined that the collimation element 20 is broken, and if the collimation electrical signal is within a preset collimation range, then it is determined that the collimation element 20 is not broken.

Specifically, the collimating element 20 is doped with a plurality of collimating conductive particles 23 , and the multiple collimating conductive particles 23 form a plurality of collimating conductive paths 24 that are mutually disjoint and mutually insulated. There are many ways to arrange the collimating conductive paths 24: for example, the extending direction of each collimating conductive path 24 is the length direction of the collimating element 20 (as shown in FIG. 18 ); or, each collimating conductive path 24 The extension direction of the collimation element 20 is the width direction (not shown in the figure), and a plurality of collimation conductive paths 24 are arranged in parallel and at intervals; or, the extension direction of each collimation conductive path 24 is the diagonal line of the collimation incident surface 201 direction (not shown), a plurality of collimated conductive paths 24 are arranged in parallel and at intervals; or, the extension direction of each collimated conductive path 24 is the diagonal direction of the collimated incident surface 201 and the collimated outgoing surface 202 (not shown in the figure) shown), a plurality of collimating conductive paths 24 are arranged in parallel and at intervals; or, each collimating conductive path 24 is arranged in parallel and at intervals along the thickness direction of the collimating element 20 (not shown in the figure). Regardless of the above arrangement of the collimating conductive paths 24, compared with setting a single collimating conductive path 24, multiple collimating conductive paths 24 can occupy more volume of the collimating element 20, correspondingly More collimated electrical signals can be output, and the processor 80 can more accurately determine whether the collimating element 20 is broken according to more collimating electrical signals, thereby improving the accuracy of detecting the collimating element 20 breaking. In other embodiments, the arrangement of the multiple collimating conductive paths 24 may also be similar to the arrangement of the multiple collimating conductive paths 24 in the diffraction element 30 described below, and will not be described here.

The position of the conductive element 52 connecting the collimation conductive path 24 and the circuit board 51 can be: a plurality of conductive elements 52 are attached to the inner surface of the side wall 61 of the lens barrel 60, and one end of each conductive element 52 is connected to the collimation input end. 241 or the collimation output end 242 is electrically connected, and the other end is electrically connected with the circuit board 51 (as shown in Figure 16 and Figure 19); Groove 63, a plurality of conductive elements 52 are arranged 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 Figure 20 and Figure 21); Or, the side wall 61 of lens barrel 60 is provided with an annular hole 64 along the axial direction, and a plurality of conductive elements 52 are all arranged in the annular hole 64, and one end of each conductive element 52 It is electrically connected with the collimation input end 241 or the collimation output end 242 , and the other end is electrically connected with the circuit board 51 (as shown in FIG. 22 and FIG. 23 ).

Wherein, the conductive element 52 may be a crystal wire 521 or a shrapnel 522 .

For example, as shown in FIG. 16 and FIG. 19 , the conductive element 52 is a shrapnel 522 . A plurality of shrapnels 522 are arranged on the circuit board 51 , and the lengths of the shrapnels 522 extend toward the light emitting direction of the laser emitter 10 . A plurality of elastic pieces 522 are attached to the inner surface of the side wall 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 shrapnel 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 multiple shrapnels 522 are spaced apart from each other, so as to ensure that the multiple shrapnels 522 are insulated from each other, thereby ensuring that the multiple collimated conductive paths 24 are insulated from each other. Of course, a layer of insulating material can also be coated on the remaining surface of each shrapnel 522 except the contact position with the collimation input end 241 or the collimation output end 242, so as to further ensure mutual insulation between the plurality of collimation conductive paths 24 .

As shown in FIG. 20 and FIG. 21 , the sidewall 61 of the lens barrel 60 is provided with grooves 63 corresponding to the multiple elastic pieces 522 , and the multiple 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 multiple collimation input terminals 241 and the multiple collimation output terminals 242 . The length of the shrapnel 522 extends toward the light emitting direction of the laser emitter 10 , and one end of each shrapnel 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 FIG. 23 , the conductive element 52 is a crystal wire 521 , and the side wall 61 of the lens barrel 60 defines an annular hole 64 along the axial direction, and a plurality of crystal wires 521 are accommodated in the annular hole 64 . Wherein, one end of some crystal lines 521 is electrically connected to the collimation input end 241, and the other end is electrically connected to the circuit board 51; connect. The outer layer of the plurality of crystal wires 521 can be coated with a layer of insulating material, so as to avoid the problem that the plurality of crystal wires 521 are in contact with each other and the multiple collimation conductive paths 24 are not insulated from each other.

In addition, the crystal wire 521 can also be attached to the inner surface of the lens barrel 60 , or set in the groove 63 opened on the side wall 61 of the lens barrel 60 ; the elastic piece can also be accommodated in the annular hole 64 .

Please refer to FIGS. 24 to 27 together. In some embodiments, there are multiple conductive elements 52, and the detection element 70 is a plurality of diffractive conductive particles 33 doped in the diffractive element 30. A plurality of diffractive conductive particles 33 form Conductive pathway 34 . The mechanism of whether the diffraction element 30 is broken or not is the same as that of the collimating element 20 when doped with collimated conductive particles 23 , and will not be repeated here.

Specifically, the diffractive element 30 is doped with a plurality of diffractive conductive particles 33 , and 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 paths 34 includes a plurality of first diffractive conductive paths 343 and a plurality of second diffractive conductive paths 344 . A plurality of first diffractive conductive paths 343 are arranged in parallel and at intervals, and a plurality of second diffractive conductive paths 344 are arranged in parallel and at intervals. Wherein, a plurality of first diffractive conductive paths 343 and a plurality of second diffractive conductive paths 344 are criss-crossed in space, and each first diffractive conductive path 343 includes a first diffractive input end 3411 and a first diffractive output end 3421, each The second diffractive conductive path 344 includes a second diffractive input port 3421 and a second diffractive output port 3422, that is, the diffractive input port 341 includes a first diffractive input port 3411 and a second diffractive input port 3412, and the diffractive output port 342 includes a first diffractive output port 3412. End 3421 and the second diffraction output end 3422. Each first diffraction input end 3411 and each first diffraction output end 3421 are connected to the processor 80 to form a diffraction conductive loop, each second diffraction input end 3412 and each second diffraction output end 3422 are connected to the processor 80 connected to form a diffractive conductive loop. Thus, both ends of the multiple first diffractive conductive paths 343 are respectively connected to the processor 80 to form multiple diffractive conductive loops, and both ends of the multiple second diffractive conductive paths 344 are respectively connected to the processor 80 to form multiple diffractive conductive loops. strip diffractive conductive loop. The plurality of first diffractive conductive paths 343 and the plurality of second diffractive conductive paths 344 criss-cross in space means that the plurality of first diffractive conductive paths 343 and the plurality of second diffractive conductive paths 344 are vertically interlaced with each other in space, that is The included angle between the first diffractive conductive path 343 and the second diffractive conductive path 344 is 90 degrees. At this time, the extending direction of the plurality of first diffractive conductive paths 343 is the longitudinal direction of the diffraction element 30, and the extending direction of the plurality of second diffractive conductive paths 344 is the width direction of the diffractive element 30 (as shown in Figure 26); or The extending direction of the plurality of first diffractive conductive paths 343 is the thickness direction of the diffractive element 30 , and the extending direction of the plurality of second diffractive conductive paths 344 is the longitudinal direction of the diffractive element 30 (not shown). Of course, in other embodiments, the plurality of first diffractive conductive paths 343 and the plurality of second diffractive conductive paths 344 criss-cross in space can also be the plurality of first diffractive conductive paths 343 and the plurality of second diffractive conductive paths 344 Inclined and interlaced with each other in space. In use, the processor 80 can simultaneously energize multiple first diffractive conductive paths 343 and multiple second diffractive conductive paths 344 to obtain multiple electrical signals. Alternatively, the processor 80 may sequentially energize a plurality of first diffractive conductive paths 343 and a plurality of second diffractive conductive paths 344 to obtain a plurality of diffractive electrical signals, and then, the processor 80 judges whether the diffractive element 30 is rupture. For example, when it is detected that the electrical signal output by the first diffractive conductive path 343 numbered ② is not within the preset diffraction range, and the diffracted electrical signal output by the second diffractive conductive path 344 numbered ④ is also not within the preset diffraction range , indicating that the diffraction element 30 is broken at the intersection of the first diffractive conductive path 343 numbered ② and the second diffractive conductive path 344 numbered ④, and the corresponding position of the diffractive element 30 is also broken. The criss-cross arrangement of the conductive paths 343 and the plurality of second diffractive conductive paths 344 can more accurately detect whether the diffractive element 30 is cracked and the specific location of the crack. In other implementation manners, the arrangement of the plurality of diffractive conductive paths 34 may also be similar to the arrangement of the collimating conductive paths 24 in the collimating element 20 , which will not be repeated here.

The position of the conductive element 52 connecting the diffraction conductive path 34 and the circuit board 51 can be: a plurality of conductive elements 52 are attached to the inner surface of the side wall 61 of the lens barrel 60, and one end of each conductive element 52 is 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) are electrically connected, and the other end is electrically connected to the circuit board 51 ( 24 and 27); or, the side wall 61 of the lens barrel 60 is provided with grooves 63 corresponding to the plurality of conductive elements 52, and the plurality of conductive elements 52 are arranged in the corresponding grooves 63, each conductive One end of the 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 Figures 28 and 29); or, the side wall 61 of the lens barrel 60 is axially An annular hole 64 is provided, and a plurality of conductive elements 52 are arranged in the annular 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 Figure 30 and Figure 31).

Wherein, the conductive element 52 may be a crystal wire 521 or a shrapnel 522 .

For example, as shown in FIG. 24 and FIG. 27 , the conductive element 52 is a shrapnel 522 . A plurality of shrapnels 522 are arranged on the circuit board 51 , and the lengths of the shrapnels 522 extend toward the light emitting direction of the laser emitter 10 . A plurality of shrapnels 522 are attached to the inner surface of the side wall 61 of the lens barrel 60 , and the number of shrapnels 522 is twice the number of diffractive conductive paths 34 . One end of each shrapnel 522 is connected to the circuit board 51 , and the other end is connected to the diffraction input end 341 or the diffraction output end 342 . Specifically, one end of a part of the elastic 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 part of the elastic piece 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 shrapnel 522 is connected to the second diffraction output end 3422 and the other end is connected to the circuit board 51 . The multiple shrapnels 522 are spaced apart from each other, so as to ensure that the multiple shrapnels 522 are insulated from each other, thereby ensuring that the multiple diffractive conductive paths 34 are insulated from each other. Of course, a layer of insulating material can also be coated on the remaining surface of each shrapnel 522 excluding the contact position with the diffraction input end 341 or the diffraction output end 342 , so as to further ensure that the plurality of diffraction conductive paths 34 are mutually insulated.

As shown in FIG. 28 and FIG. 29 , the side wall 61 of the lens barrel 60 is provided with grooves 63 corresponding to the multiple elastic pieces 522 , and the multiple elastic pieces 522 are disposed in the corresponding grooves 63 . The positions of the shrapnel 522 are in one-to-one correspondence with the positions of the plurality of diffraction input ends 341 and the diffraction output ends 342 . The length of the shrapnel 522 extends toward the light emitting direction of the laser emitter 10 , and one end of each shrapnel 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 a part of the elastic 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 part of the elastic piece 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 shrapnel 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 FIG. 31 , the conductive element 52 is a crystal wire 521 , and 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 accommodated in the annular hole 64 . Wherein, one end of part of crystal wire 521 is electrically connected with first diffraction input end 3411, and the other end is electrically connected with circuit board 51; Connection; one end of part of the 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 part of the crystal line 521 is electrically connected to the second diffraction output end 3422, and the other end is electrically connected to the circuit board 51 connect. The outer layer of the plurality of crystal wires 521 can be covered with a layer of insulating material, so as to avoid the problem that the plurality of crystal wires 521 are in contact with each other and the plurality of diffractive conductive paths 34 are not insulated from each other.

In addition, the crystal wire 521 can also be attached to the inner surface of the lens barrel 60 , or set in the groove 63 opened on the side wall 61 of the lens barrel 60 ; the elastic piece can also be accommodated in the annular hole 64 .

Please refer to FIG. 32. In some embodiments, a light-transmitting collimating conductive film 21 is provided on the collimating incident surface 201 of the collimating element 20, and a plurality of collimating collimating conductive films 21 are provided on the light-transmitting collimating conductive film 21. The conductive electrode 22 and the diffraction element 30 are doped with a plurality of diffractive conductive particles 33 , and the plurality of diffractive conductive particles 33 form a plurality of parallel and mutually insulated diffractive conductive paths 34 . The conductive element 52 is a crystal wire 52 . 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 5212 (hereinafter referred to as "collimation wires 5212") respectively connected to a plurality of collimating conductive electrodes 22 and the circuit board 51 are attached. On the inner surface of the side wall 61 of the lens barrel 60 , a plurality of crystal wires 5211 (hereinafter referred to as “diffraction crystal wires 5211 ”) respectively connecting the plurality of diffractive conductive paths 34 and the circuit board 51 are accommodated in the annular hole 64 . Specifically, one end of part of the collimation crystal wire 5212 is electrically connected to the collimation input end 221, and the other end is electrically connected to the circuit board 51, and one end of the remaining part of the collimation crystal wire 5212 is electrically connected to the collimation output end 222, and the other end is electrically connected to the collimation output end 222. It is electrically connected to the circuit board 51 . One end of some diffractive crystal wires 5211 is connected to the diffraction input end 321 , and the other end is electrically connected to the circuit board 51 . The collimating conductive electrode 22 on the collimating element 20 can output the collimated electrical signal to the processor 80 through the collimating crystal line 5212, and the diffractive conductive path 34 on the diffractive element 30 can output the diffractive electrical signal to the processor 80 through the diffractive crystal line 5211. Processor 80. In this way, the processor 80 can not only detect whether the collimation element 20 is broken, but also detect whether the diffraction element 30 is broken, and when any one of the collimation element 20 and the diffraction element 30 is detected to be broken, the laser emitter 10 is immediately turned off. Or reduce the emission power of the laser transmitter 10 to avoid harm to human eyes.

Referring to FIG. 33 , in some embodiments, the circuit board assembly 50 further includes a substrate 53 on which the circuit board 51 is carried. The circuit board 51 may be a rigid board, a flexible board or a combination of rigid and flexible boards. The circuit board 51 defines a via hole 511 , and the laser emitter 10 is carried on the substrate 53 and accommodated in the via hole 511 . The laser transmitter 10 is electrically connected to the processor 80 via the circuit board 51 . The heat dissipation hole 531 is also provided on the substrate 53 , the heat generated by 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 also be filled with thermal conductive glue to further improve the heat dissipation performance of the substrate 53 .

The laser transmitter 10 can be a vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser, VCSEL) or an edge-emitting laser (edge-emitting laser, EEL). In the embodiment shown in FIG. 33, the laser transmitter 10 is an edge-emitting laser. The laser, specifically, the laser transmitter 10 may be a distributed feedback laser (Distributed Feedback Laser, DFB). The laser emitter 10 is used to emit laser light into the accommodation cavity 62 . Please refer to FIG. 34 , the laser emitter 10 has a columnar shape as a whole, and an end surface of the laser emitter 10 away from the substrate 53 forms a light-emitting surface 11 , from which the laser light is emitted, and the light-emitting surface 11 faces the collimation element 20 . The laser emitter 10 is fixed on the substrate 53 , specifically, the laser emitter 10 can be bonded on the substrate 53 through the sealant 15 , for example, the side of the laser emitter 10 opposite to the light-emitting surface 11 is bonded on the substrate 53 . Please combine Figure 33 and Figure 35, the side 12 of the laser emitter 10 can also be bonded on the substrate 53, and the sealing glue 15 can wrap the sides around, or only a certain surface of the side can be bonded to the substrate 53 or a certain surface can be bonded. Several faces are connected with the substrate 53 . At this time, the sealing glue 15 can be a heat-conducting glue, so as to conduct the heat generated by the laser emitter 10 to the substrate 53 .

The laser projection module 100 adopts an edge-emitting laser as the laser emitter 10. On the one hand, the temperature fluctuation of the edge-emitting laser is smaller than that of the VCSEL array; , the cost of the laser projection module 100 is relatively low.

When the laser light of the distributed feedback laser is propagating, the power gain is obtained through the feedback of the grating structure. To increase the power of the distributed feedback laser, it is necessary to increase the injection current and/or increase the length of the distributed feedback laser, because increasing the injection current will increase the power consumption of the distributed feedback laser and cause serious heating problems, so , in order to ensure that the distributed feedback laser can work normally, it is necessary to increase the length of the distributed feedback laser, resulting in the distributed feedback laser generally having a slender strip structure. When the light-emitting surface 11 of the side-emitting laser is facing the collimation element 20, the side-emitting laser is placed vertically. Since the side-emitting laser is in a slender structure, the side-emitting laser is prone to accidents such as falling, shifting or shaking. Therefore, by setting The sealant 15 can fix the side-emitting laser to prevent accidents such as dropping, shifting or shaking of the side-emitting laser.

Please refer to FIG. 33 and FIG. 36 , in some embodiments, the laser emitter 10 may also be fixed on the substrate 53 in a fixing manner as shown in FIG. 36 . Specifically, the laser projection module 100 includes a plurality of supports 16 , and the supports 16 can be fixed on the substrate 53 . A plurality of support members 16 enclose a receiving space 160 , and the laser emitter 10 is accommodated in the receiving space 160 and is supported by the plurality of support members 16 . During installation, the laser emitter 10 can be installed directly between a plurality of supports 16 . In one example, multiple supports 16 jointly clamp the laser emitter 10 to further prevent the laser emitter 10 from shaking.

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

Please refer to FIG. 37 , the present invention also provides a depth camera 1000 . The depth camera 1000 in the embodiment of the present invention includes the laser projection module 100 , the image collector 200 and the processor 80 in any one of the above embodiments. Wherein, the image collector 200 is used for collecting the laser pattern projected into the 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. Processor 80 is used to process the laser pattern to obtain 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 can be an infrared camera, and the processor 80 uses an image matching algorithm to calculate the deviation value between each pixel point in the laser pattern and the corresponding pixel point in the reference pattern, and then further obtain the depth image of the laser pattern according to the deviation value . Wherein, the image matching algorithm may be a digital image correlation (Digital Image Correlation, DIC) algorithm. Of course, other image matching algorithms can also be used instead of the DIC algorithm.

Please refer to FIG. 1 and FIG. 38 together. An electronic device 3000 according to an embodiment of the present invention includes a casing 2000 and the depth camera 1000 according to the above embodiment. The depth camera 1000 is disposed inside the housing 2000 and exposed from the housing 2000 to acquire a depth image.

The laser projection module 100 of the embodiment of the present invention arranges the detection element 70 on the optical assembly 40, and uses a conductive element to electrically connect the detection element 70 to the circuit board 51, so that the processor 80 can receive the electrical signal output by the detection element 70 , so as to judge whether the optical component 40 is broken according to the electric signal. After detecting that the optical assembly 40 is broken, turn off the laser emitter 10 or reduce the power of the laser emitter 10 in time, so as to avoid the problem that the emitted laser energy is too large and damage the user's eyes due to the rupture of the optical assembly 40, and improve the laser projection mode. Security used by group 100.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (14)

1. A laser projection module, characterized in that, the laser projection module comprises: a laser emitter, the laser emitter is used to emit laser light; An optical component, the optical component is arranged on the light-emitting optical path of the laser emitter, the laser light passes through the optical component to form a laser pattern, and the optical component is provided with a detection element; A circuit board assembly, the circuit board assembly includes a circuit board and a conductive element, the detection element is electrically connected to the circuit board through the conductive element, and the laser emitter is arranged on the circuit board assembly; and A processor connected to the circuit board, the processor is used to receive the electrical signal output by the detection element to determine whether the optical component is broken. 2. The laser projection module according to claim 1, wherein the laser projection module further comprises a lens barrel, the lens barrel is arranged on the circuit board and forms a storage cavity with the circuit board , the laser emitter is accommodated in the accommodation cavity, the optical assembly includes a diffraction element and a collimation element accommodated in the accommodation cavity, and the collimation element and the diffraction element are arranged along the laser emitter The light-emitting light paths are set in sequence. 3. The laser projection module according to claim 2, wherein the conductive element comprises a plurality, the detection element is a light-transmitting collimating conductive film arranged on the collimating element, and the transparent A collimating conductive electrode is arranged on the photo-collimating conductive film, and the collimating conductive electrode includes a collimating input terminal and a collimating output terminal, and the collimating input terminal is connected to the circuit board through one conductive element, so The collimation output end is connected to the circuit board through another conductive element. 4. The laser projection module according to claim 2, wherein the conductive element comprises a plurality, the detection element is collimated conductive particles doped in the collimated element, and the collimated The conductive particles form a collimated conductive path, and the collimated conductive path includes a collimated input end and a collimated output end; the collimated input end is connected to the circuit board through a conductive element, and the collimated output end is connected to the circuit board through another One of the conductive elements is connected to the circuit board. 5. The laser projection module according to claim 3 or 4, wherein a plurality of conductive elements are attached to the inner surface of the side wall of the lens barrel, and one end of each conductive element is connected to the The collimation input end or the collimation output end are electrically connected, and the other end is electrically connected to the circuit board; or The side wall of the lens barrel is provided with an annular hole in the axial direction, and a plurality of the conductive elements are arranged in the annular hole, and one end of each of the conductive elements is connected to the collimating input end or the collimating input end. The direct output end is electrically connected, and the other end is electrically connected to the circuit board; or The side wall of the lens barrel is provided with grooves corresponding to a plurality of the conductive elements, each conductive element is arranged in the corresponding groove, and one end of each conductive element is connected to the collimation input end Or the collimation output end is electrically connected, and the other end is electrically connected to the circuit board. 6. The laser projection module according to claim 2, wherein the conductive element comprises a plurality, the detection element is a light-transmitting diffraction conductive film arranged on the diffraction element, and the light-transmitting diffraction A diffractive conductive electrode is provided on the conductive film, and the diffractive conductive electrode includes 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. The conductive element is connected to the circuit board. 7. The laser projection module according to claim 2, wherein the conductive element comprises a plurality, the detection element is diffractive conductive particles doped in the diffractive element, and the diffractive conductive particles form A diffractive conductive path, the diffractive conductive path includes a diffractive input end and a diffractive output end; the diffractive input end is connected to the circuit board through a conductive element, and the diffractive output end is connected to the circuit through another conductive element board connection. 8. The laser projection module according to claim 6 or 7, wherein a plurality of conductive elements are attached to the inner surface of the side wall of the lens barrel, and one end of each conductive element is connected to the The diffraction input end or the diffraction output end are electrically connected, and the other end is electrically connected to the circuit board; or The side wall of the lens barrel is provided with an annular hole in the axial direction, and a plurality of conductive elements are arranged in the annular hole, and one end of each conductive element is connected to the diffraction input end or the diffraction output one end is electrically connected, and the other end is electrically connected to the circuit board; or The side wall of the lens barrel is provided with a plurality of grooves corresponding to the plurality of conductive elements, each conductive element is arranged in the corresponding groove, and one end of each conductive element is connected to the diffraction input end or the diffraction output end is electrically connected, and the other end is electrically connected to the circuit board. 9 . The laser projection module according to claim 1 , wherein the laser emitter includes an edge-emitting laser, and the edge-emitting laser includes a light-emitting surface, and the light-emitting surface faces the collimation element. 10. The laser projection module according to claim 9, wherein the laser projection module further comprises a fixing member, the circuit board assembly further comprises a substrate, the circuit board is carried on the substrate, the The fixing member is used to fix the edge emitting laser on the substrate. 11. The laser projection module according to claim 10, wherein the fixing member includes a sealant, the sealant is arranged between the edge-emitting laser and the circuit board, and the sealant is thermal paste. 12. The laser projection module according to claim 10, wherein the fixing member comprises at least two elastic supporting members arranged on the circuit board assembly, and at least two of the supporting members together form a housing space, the accommodating space is used to accommodate the laser emitter, and at least two of the support members are used to support the laser emitter. 13. A depth camera, characterized in that the depth camera comprises: The laser projection module according to any one of claims 1 to 12; an image collector, the image collector is used to collect the laser pattern projected by the laser projection module into the target space; and The processor is configured to process the laser pattern to obtain a depth image. 14. An electronic device, characterized in that the electronic device comprises: shell; and The depth camera of claim 13 disposed within and exposed from the housing to acquire a depth image.