CN108388072B

CN108388072B - Laser projection module, depth camera and electronic device

Info

Publication number: CN108388072B
Application number: CN201810164305.4A
Authority: CN
Inventors: 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: 2020-01-10
Anticipated expiration: 2038-02-27
Also published as: CN108388072A

Abstract

The invention discloses a laser projection module. The laser projection module comprises a light source, a collimation element, a diffraction optical element, a detection element and a processor. The detection assembly comprises detection electrode pairs which are respectively arranged between the collimation incidence surface and the collimation emergent surface and/or between the diffraction incidence surface and the diffraction emergent surface, and the detection electrode pairs output electric signals after being electrified. The processor is used for detecting whether the collimating element and/or the diffractive optical element is broken or not according to the change of the electric signal. The invention also discloses a depth camera and an electronic device. Utilize the detection component to detect collimating element and/or diffraction element's signal of telecommunication in order to detect whether collimating element and/or diffraction element break, and then carry out relevant control to the light source, promote the security that laser projection module used.

Description

Laser projection module, depth camera and electronic device

Technical Field

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

Background

The laser projection module comprises a laser emitter, a collimating element and a Diffractive Optical Element (DOE), and when the mobile phone is dropped accidentally, the collimating element and/or the DOE may be dropped or damaged, which causes the laser to be emitted out and easily burns a user.

Disclosure of Invention

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

The laser projection module of the embodiment of the invention comprises:

a light source for emitting laser light;

the collimating element comprises a collimating incident surface and a collimating emergent surface which are positioned on two opposite sides, and the collimating element is used for collimating the laser;

the diffraction optical element comprises a diffraction incident surface and a diffraction emergent surface which are positioned on two opposite sides, and the diffraction optical element is used for diffracting the laser collimated by the collimation element to form a laser pattern;

the detection assembly comprises detection electrode pairs which are respectively arranged between the collimation incidence surface and the collimation emergent surface and/or between the diffraction incidence surface and the diffraction emergent surface, and the detection electrode pairs output electric signals after being electrified;

a processor connected to the detection assembly for detecting whether the collimating element and/or the diffractive optical element is broken based on the change in the electrical signal.

In some embodiments, the pair of detection electrodes form a capacitance, and the processor is configured to determine whether the collimating element and/or the diffractive optical element is broken based on a change in a capacitance value of the capacitance.

In some embodiments, the laser projection module further comprises:

the light source comprises a substrate and a circuit board, wherein the substrate assembly comprises a substrate and the circuit board loaded on the substrate, the circuit board is provided with a through hole, and the light source is loaded on the substrate and is accommodated in the through hole;

the lens cone comprises a lens cone side wall, the lens cone side wall is arranged on the substrate assembly and forms an accommodating cavity together with the substrate assembly, and the light source, the collimating element and the diffractive optical element are all accommodated in the accommodating cavity and are sequentially arranged on a light path of the light source;

the protective cover is combined with the lens barrel and comprises a protective top wall, a light through hole is formed in the protective top wall, and the light through hole corresponds to the diffractive optical element.

In some embodiments, the barrel further comprises a limiting protrusion protruding inward from a sidewall of the barrel, the diffractive optical element being mounted on the limiting protrusion.

In some embodiments, the limiting protrusion has a through hole, and the detection component located on the collimation exit surface and/or the diffraction incident surface is accommodated in the through hole.

In some embodiments, the light source comprises an edge-emitting laser comprising a light emitting face, the light emitting face facing the collimating element.

In some embodiments, the laser projection module further comprises a fixing member for fixing the edge-emitting laser to the substrate assembly.

In some embodiments, the fixing member includes an encapsulant disposed between the edge-emitting laser and the substrate assembly, and the encapsulant is a thermally conductive adhesive.

In some embodiments, the fixture includes a support frame disposed on the base plate assembly, the edge-emitting laser being secured to the support frame.

The depth camera of the embodiment of the invention comprises:

the laser projection module;

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

a processor for processing the laser pattern to obtain a depth image.

In some embodiments, the processor is further configured to determine an operating state of the laser projection module according to the detection signal of the detection element to control the light source of the laser projector to emit or turn off.

An electronic device according to an embodiment of the present invention includes:

a housing; and

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 assembly is arranged on the collimation element and/or the diffraction element of the laser projection module, and the detection assembly is used for detecting the electric signal of the collimation element and/or the diffraction element to detect whether the collimation element and/or the diffraction element is broken or not, at the moment, the processor can immediately turn off the laser emitter or reduce the emission power of the laser emitter, so that the problems that the emitted laser energy is too large and harm is caused to eyes of a user due to damage of the collimation element and/or the diffraction element are avoided, and the use safety of the laser projection module is improved.

Additional aspects and advantages of embodiments 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 embodiments of the invention.

Drawings

The above 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 an electronic device according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a depth camera according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a laser projection module according to an embodiment of the invention;

FIG. 4 is a schematic cross-sectional view of the laser projection module of FIG. 3 taken along line IV-IV;

FIG. 5 is a schematic cross-sectional view of a laser projection module according to another embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of the laser projection module shown in FIG. 5 taken along line VI-VI;

FIG. 7 is a schematic cross-sectional view of a laser projection module according to yet another embodiment of the present invention;

fig. 8 to 10 are schematic views showing a partial structure of a laser projector according to an embodiment of the present invention.

Description of the main element symbols:

the electronic device 1000, the housing 200, the depth camera 100, the laser projection module 10, the substrate assembly 11, the substrate 111, the heat dissipation hole 1111, the circuit board 112, the via hole 113, the lens barrel 12, the receiving cavity 121, the lens barrel sidewall 122, the limiting protrusion 123, the light passing hole 1231, the limiting surface 1232, the light source 13, the edge-emitting laser 131, the light emitting surface 1311, the side surface 1312, the collimating element 14, the collimating incident surface 141a, the collimating emergent surface 141b, the diffractive optical element 15, the diffractive emergent surface 151, the diffractive incident surface 152, the connector 17, the fixing member 18, the sealant 181, the support frame 182, the detecting element 19, the image collector 20, the processor 30, the projection window 40, and the collection window 50.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.

In addition, the embodiments of the present invention described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the embodiments of the present invention, and are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, an electronic device 1000 according to an embodiment of the invention includes a housing 200 and a depth camera 100. The electronic device 1000 may be a mobile phone, a tablet computer, a laptop computer, a game machine, a head display device, an access control system, a teller machine, etc., and the embodiment of the present invention is described by taking the electronic device 1000 as a mobile phone, it is understood that the specific form of the electronic device 1000 may be other, and is not limited herein. The depth camera 100 is disposed in the housing 200 and exposed from the housing 200 to obtain a depth image, the housing 200 can provide protection for the depth camera 100 against dust, water, and falling, and the housing 200 is provided with a hole corresponding to the depth camera 100, so that light rays can pass through the hole or penetrate into the housing 200.

Referring to fig. 2, the depth camera 100 includes a laser projection module 10, an image collector 20 and a processor 30. The depth camera 100 may be formed with a projection window 40 corresponding to the laser projection module 10, and a collection window 50 corresponding to the image collector 20. The laser projection module 10 is configured to project a laser pattern to a target space through the projection window 40, and the image collector 20 is configured to collect the laser pattern modulated by a target object through the collection window 50. In one example, the laser projected by the laser projection module 10 is infrared light, and the image collector 20 is an infrared camera. The processor 30 is connected to both the laser projection module 10 and the image collector 20, and the processor 30 is configured to process the laser pattern to obtain a depth image. Specifically, the processor 30 calculates the 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 the 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. The structure of the laser projection module 10 will be further described below.

Referring to fig. 3 to 6, the laser projection module 10 includes a substrate assembly 11, a lens barrel 12, a light source 13, a collimating element 14, a diffractive optical element 15, a detecting element 19, and a processor 30. The light source 13, the collimating element 14 and the diffractive optical element 15 are arranged in this order on the optical path of the light source 13, in particular, the light emitted by the light source 13 passes through the collimating element 14 and the diffractive optical element 15 in this order. The processor 30 may be the processor 30 of the depth camera 100.

Referring to fig. 3 and 5, the substrate assembly 11 includes a substrate 111 and a circuit board 112 carried on the substrate 111. The substrate 111 is used to carry the lens barrel 12, the light source 13, and the circuit board 112. The material of the substrate 111 may be plastic, such as at least one of Polyethylene Terephthalate (PET), polymethyl methacrylate (PMMA), Polycarbonate (PC), and Polyimide (PI). That is, the substrate 111 may be made of a single plastic material selected from PET, PMMA, PC, and PI. Thus, the substrate 111 is light in weight and has sufficient support strength.

The circuit board 112 may be any one of a printed circuit board, a flexible circuit board, and a rigid-flex board. The circuit board 112 may be provided with a via hole 113, the via hole 113 may be used to accommodate the light source 13, a portion of the circuit board 112 is covered by the lens barrel 12, and another portion of the circuit board extends out and may be connected to the connector 17, and the connector 17 may connect the laser projection module 10 to a main board of the electronic device 1000.

Referring to fig. 3 to 5, the lens barrel 12 is disposed on the substrate assembly 11 and forms a receiving cavity 121 together with the substrate assembly 11. Specifically, the lens barrel 12 may be connected to the circuit board 112 of the substrate assembly 11, and the lens barrel 12 and the circuit board 112 may be adhered by an adhesive to improve the air tightness of the accommodating chamber 121. Of course, the lens barrel 12 and the substrate assembly 11 may be connected in other specific ways, such as by a snap connection. The accommodating cavity 121 may be used to accommodate components such as the collimating element 14 and the diffractive optical element 15, and the accommodating cavity 121 simultaneously forms a part of the optical path of the laser projection module 10. In the embodiment of the present invention, the lens barrel 12 is in a hollow cylindrical shape, and the lens barrel 12 includes a barrel sidewall 122 and a limiting protrusion 123.

Referring to fig. 5, the limiting protrusion 123 protrudes inward from the barrel sidewall 122, and specifically, the limiting protrusion 123 protrudes from the barrel sidewall 122 into the receiving cavity 121. The limiting protrusion 123 may be continuous and annular, or the limiting protrusion 123 includes a plurality of limiting protrusions 123, and the plurality of limiting protrusions 123 are distributed at intervals. The limiting protrusion 123 forms a light passing hole 1231, the light passing hole 1231 may be a part of the accommodating cavity 121, and the laser passes through the light passing hole 1231 and then penetrates into the diffractive optical element 15. Meanwhile, when the laser projection module 10 is assembled, when the diffractive optical element 15 abuts against the limiting protrusion 123, the diffractive optical element 15 can be considered to be installed in place, and when the collimating element 14 abuts against the limiting protrusion 123, the collimating element 14 can be considered to be installed in place. The stopper protrusion 123 includes a stopper surface 1232, and the stopper surface 1232 is combined with the diffractive optical element 15 when the diffractive optical element 15 is mounted on the stopper protrusion 123.

Referring to fig. 7, the light source 13 is disposed on the substrate assembly 11, specifically, the light source 13 may be disposed on the circuit board 112 and electrically connected to the circuit board 112, and the light source 13 may also be disposed on the substrate 111 and corresponding to the via 113, at this time, the light source 13 may be electrically connected to the circuit board 112 by disposing a wire. The light source 13 is used for emitting Laser light, which may be infrared light, and in one example, the light source 13 may include a semiconductor substrate disposed on the substrate 111 and an emitting Laser disposed on the semiconductor substrate, which may be a Vertical Cavity Surface Emitting Laser (VCSEL). The semiconductor substrate may be provided with a single emitting laser or with an array laser composed of a plurality of emitting lasers, and specifically, the plurality of emitting lasers may be arranged on the semiconductor substrate in a regular or irregular two-dimensional pattern.

Referring to fig. 3 and 5, the collimating element 14 may be an optical lens, the collimating element 14 is used for collimating the laser emitted by the light source 13, and the collimating element 14 is accommodated in the accommodating cavity 121. The collimating element 14 includes an optical portion and a mounting portion, the mounting portion is used for combining with the barrel sidewall 122 and fixing the collimating element 14, in the embodiment of the present invention, the optical portion includes a collimating incident surface 141a and a collimating emergent surface 141b, which are located on two opposite sides of the collimating element 14.

Referring to fig. 5, the diffractive optical element 15 is mounted on the limiting protrusion 123, and specifically, the diffractive optical element 15 is combined with the limiting surface 1232 to be mounted on the limiting protrusion 123. The outer surface of the diffractive optical element 15 includes a diffractive exit surface 151 and a diffractive entrance surface 152. The diffractive exit surface 151 and the diffractive entrance surface 152 are opposite to each other, and when the diffractive optical element 15 is mounted on the stopper protrusion 123, the diffractive entrance surface 152 is combined with the stopper surface 1232. In the embodiment of the present invention, the diffraction incident surface 152 is formed with a diffraction structure, the diffraction exit surface 151 may be a smooth plane, and the diffractive optical element 15 may project the laser light collimated by the collimating element 14 into a laser light pattern corresponding to the diffraction structure. The diffractive optical element 15 can be made of glass, or, as it were, of a composite plastic (e.g., PET).

Referring to fig. 3 to 6, the detecting element 19 may be a pair of detecting electrodes respectively disposed on the collimating incident surface 141a and the collimating emergent surface 141b and/or the diffracting emergent surface 151 and the diffracting incident surface 152, and the pair of detecting electrodes outputs an electrical signal after being energized, so as to detect the states of the collimating element 14 and the diffracting optical element 15 respectively according to changes of the output electrical signal. It can be understood that, when the laser projection module 10 is used normally, the laser emitted by the light source 13 sequentially passes through the collimating element 14 and the diffractive optical element 15 to be emitted, and the collimating element 14 and the diffractive optical element 15 have a certain energy attenuation effect on the laser, so that it can be ensured that the emitted laser energy is not too large to hurt human eyes. However, when the laser projection module 10 is dropped, the collimating element 14 and the diffractive optical element 15 disposed in the laser projection module 10 may be dropped or damaged from the laser projection module 10, and at this time, the laser of the laser emitter 10 may be directly emitted without passing through the collimating element 14 and/or the diffractive optical element 15, so that the emitted laser is not attenuated by the collimating element 14 and/or the diffractive optical element 15, which may cause the energy of the laser reaching human eyes to be too high, and cause damage to the human eyes.

In some examples, the limiting protrusion 123 is opened with a through hole, and the detection component 19 located on the collimated exit surface 141b and/or the diffraction incident surface 152 is received in the through hole.

Specifically, the number of through holes may be multiple, the multiple through holes correspond to the multiple pairs of detection assemblies one by one, and the detection assemblies 19 located on the collimated exit surface 141b and/or the diffraction incident surface 152 are accommodated in one through hole.

In summary, in the laser projection module 10, the depth camera 100 and the electronic device 1000 according to the embodiment of the invention, the detection component is disposed on the collimating element and/or the diffraction element of the laser projection module 10, and the detection component is used to detect the electrical signal of the collimating element and/or the diffraction element to detect whether the collimating element and/or the diffraction element is broken, at this time, the processor can immediately turn off the laser emitter or reduce the emission power of the laser emitter, so as to avoid the problem that the emitted laser energy is too large due to the breakage of the collimating element and/or the diffraction element, which damages the eyes of the user, and improve the safety of the laser projection module.

In some embodiments, the pair of detection electrodes forms a capacitance, and the processor 30 is configured to determine whether the collimating element 14 and/or the diffractive optical element 15 is broken based on a change in the capacitance value of the capacitance.

Specifically, the pair of detection electrodes may be made of a light-transmitting conductive material such as ITO (indium tin oxide), IZO (indium zinc oxide) or the like so as not to affect the light emission paths of the collimating element 14 and the diffractive optical element 15; alternatively, the detection electrode pair may be provided in a non-optically active portion of the collimating element 14 and/or the diffractive optical element 15 (for example, a non-convex portion of the collimating element 14 and a non-diffraction grating portion of the diffractive optical element 15). Wherein, the number of the detection electrode pairs can be one or more. The pairs of detection electrodes are arranged in a plurality of pairs, and the detection electrodes of the plurality of pairs may be uniformly distributed at peripheral positions of the collimating element 14 and/or the diffractive optical element 15. It will be appreciated that a capacitance is formed between each pair of detection electrodes, and when the element is broken or dropped, the distance between the pair of detection electrodes changes, and the capacitance value of the capacitance changes accordingly, and the electrical signal output to the processor may reflect the capacitance values of the two electrodes, so as to determine the collimating element 14 and/or the diffractive optical element 15. When the collimating element 14 and the diffractive optical element 15 are not broken, the distance of the detection electrode between the collimating element 14 and the diffractive optical element 15 is not changed; when any one of the collimating element 14 and the diffractive optical element 15 is damaged, the distance between the pair of detection electrodes disposed thereon changes, and the electrical signal obtained by the processor reflects the change and indicates the changed distance between the collimating element and the diffractive element. Specifically, when the electrode pair distance changes within a predetermined interval, that is, when the detection electrode pair distance of each of the collimating element 14 and/or the diffractive optical element 15 changes less, the collimating element 14 and the diffractive optical element 15 can still work normally, and at this time, the processor 30 does not need to turn off the light source 13 or reduce the emission power of the light source 13; if the distance between the collimating element 14 and the diffractive optical element 15 varies greatly, i.e. the varying distance exceeds a predetermined interval, the processor needs to perform an operation of turning off the light source 13 or reducing the emitting power of the light source 13, so as to avoid the problem that the emitted laser energy is too large and hurts the eyes of the user.

In some embodiments, the detection component 19 may also be a transmitter and a receiver. The emitters and receivers are arranged on the collimated entrance face 141a and the collimated exit face 141b and/or the diffractive entrance face 152 and the diffractive exit face 151, respectively. Specifically, the transmitter and the receiver should be provided at the non-optically active portions of the collimating element 14 and the diffractive optical element (for example, the non-convex portion of the collimating element 14 and the non-diffraction grating portion of the diffractive optical element 15) so as not to affect the light emitting paths of the collimating element 14 and the diffractive optical element 15. The transmitter and receiver pairs may be one or more pairs. The pairs of emitters and receivers are multiple pairs, which may be evenly distributed at the circumferential position of the collimating element 14 and/or the diffractive element 15. Wherein, the transmitter can be used for transmitting light or ultrasonic wave, and the receiver can be used for receiving the light or ultrasonic wave that the corresponding transmitter transmitted. The light or ultrasonic wave received by the receiver can be converted into an electric signal, and the strength of the electric signal can be used for representing the strength of the light or ultrasonic wave and further representing the distance between the incident surface and the emergent surface of the collimating element 14 and the diffractive optical element 15 respectively. In addition, the distance between the respective incident surface and exit surface of the collimating element 14 and the diffractive optical element 15 can also be calculated based on the time difference between the time point when the transmitter emits the light or the ultrasonic wave and the time point when the receiver receives the light or the ultrasonic wave; alternatively, the distance between the respective incident surface and exit surface of the collimating element 14 and the diffractive optical element 15 may also be calculated based on the phase difference between the light emitted by the emitter and the light received by the receiver. When the collimating element 14 and the diffractive optical element 15 are not broken, the distance between the collimating element and the diffractive element does not change; when any one of the collimating element and the diffractive element is damaged, the distance between the incident surface and the exit surface of the collimating element 14 or the diffractive optical element 15 changes, and the electrical signals obtained by the processor from the transmitter and the receiver reflect the change and indicate the distance between the incident surface and the exit surface of the collimating element 14 and/or the diffractive optical element respectively after the change. Specifically, if the distance between the incident surface and the exit surface of the collimating element 14 and/or the diffractive optical element 15 is within a predetermined interval, that is, the distance is changed less, the collimating element and the diffractive optical element can still work normally, and at this time, the processor does not need to turn off the light source 13 or reduce the emission power of the light source 13; if the distance between the collimating element 14 and/or the diffractive optical element 15 varies greatly, i.e. the varying distance exceeds a predetermined interval, the processor needs to perform an operation of turning off the light source or reducing the emitting power of the light source, so as to avoid the problem that the emitted laser energy is too large and hurts the eyes of the user. In addition, when the emitter emits light, the wavelength of the light should be different from the wavelength of the laser light emitted by the laser emitter to avoid affecting the laser patterning.

Referring to fig. 7, in some embodiments, the light source 13 includes an edge-emitting Laser (EEL) 131, and specifically, the edge-emitting Laser 131 may be a distributed feedback Laser (DFB). The edge-emitting laser 131 is columnar as a whole, and a light-emitting surface 1311 is formed on one end surface of the edge-emitting laser 131 away from the substrate assembly 11, and laser light is emitted from the light-emitting surface 1311, with the light-emitting surface 1311 facing the collimating element 14. The edge-emitting laser 131 is adopted as a light source, on one hand, the temperature of the edge-emitting laser 131 is lower than that of a VCSEL array, and on the other hand, the edge-emitting laser 131 is of a single-point light-emitting structure, so that an array structure does not need to be designed, the manufacturing is simple, and the light source cost of the laser projection module 10 is lower.

Referring to fig. 7 and 8, in some embodiments, the laser projection module 10 further includes a fixing member 18, and the fixing member 18 is used for fixing the edge-emitting laser 131 on the substrate assembly 11. 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 1311 of the edge-emitting laser 131 faces the collimating element 14, the edge-emitting laser 131 is vertically placed, and because the edge-emitting laser 131 is of a slender strip structure, the edge-emitting laser 131 is prone to falling, shifting or shaking accidents, and therefore the edge-emitting laser 131 can be fixed by arranging the fixing member 18, and the edge-emitting laser 131 is prevented from falling, shifting or shaking accidents.

Specifically, referring to fig. 8, in some embodiments, the fixing member 18 includes an encapsulant 181, and the encapsulant 181 is disposed between the edge-emitting laser 131 and the substrate assembly 11. More specifically, in the example shown in fig. 8, the side emitting laser 131 is bonded to the substrate assembly 11 on the side opposite to the light emitting surface 1311. In the example shown in fig. 9, the side surface 1312 of the edge-emitting laser 131 may be bonded to the substrate assembly 11, and the side surface 1312 around the side surface may be covered with the sealant 181, or only one of the side surfaces 1312 may be bonded to the substrate assembly 11, or some of the side surfaces may be bonded to the substrate assembly 11. Further, the encapsulant 181 may be a heat conductive adhesive to conduct heat generated by the operation of the light source 13 to the substrate assembly 11. In order to improve the heat dissipation efficiency, the substrate 111 may further be formed with a heat dissipation hole 1111, heat generated by the operation of the light source 13 or the circuit board 112 may be dissipated through the heat dissipation hole 1111, and the heat dissipation hole 1111 may be filled with a thermal conductive adhesive to further improve the heat dissipation performance of the substrate assembly 11.

Referring to fig. 10, in some embodiments, the fixing member 18 includes a supporting frame 182, the supporting frame 182 is disposed on the substrate assembly 11, and the edge-emitting laser 131 is fixed on the supporting frame 182. The number of the supporting frames 182 may be plural, the plural supporting frames 182 may surround the edge-emitting laser 131 together, and the edge-emitting laser 131 may be directly mounted between the plural supporting frames 182 at the time of mounting. In one example, the plurality of support brackets 182 collectively clamp the edge-emitting laser 131 to further prevent the edge-emitting laser 131 from shaking.

In some embodiments, the substrate 111 may be omitted and the light source 13 may be directly fixed on the circuit board 112 to reduce the overall thickness of the laser projection module 10.

In the description of the specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means 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, schematic representations of the above terms do not necessarily 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, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.

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 those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.

Claims

1. A laser projection module, comprising:

a light source for emitting laser light;

a processor connected to the detection assembly for detecting whether the collimating element and/or the diffractive optical element is broken based on a change in the electrical signal;

the lens cone comprises a lens cone side wall and a limiting bulge protruding inwards from the lens cone side wall, the diffractive optical element is mounted on the limiting bulge, the limiting bulge is provided with a through hole, and the detection assembly located on the collimation emergent surface and/or the diffraction incident surface is accommodated in the through hole.

2. The laser projection module of claim 1, wherein the pair of detection electrodes forms a capacitance, and the processor is configured to determine whether the collimating element and/or the diffractive optical element is broken according to a change in a capacitance value of the capacitance.

3. The laser projection module of claim 1, further comprising:

the lens barrel comprises a substrate assembly and a lens barrel body, wherein the substrate assembly comprises a substrate and a circuit board loaded on the substrate, the circuit board is provided with a through hole, the light source is loaded on the substrate and is contained in the through hole, the side wall of the lens barrel body is arranged on the substrate assembly and forms a containing cavity together with the substrate assembly, and the light source, the collimating element and the diffractive optical element are all contained in the containing cavity and are sequentially arranged on a light path of the light source;

4. The laser projection module of claim 1, wherein the light source comprises an edge-emitting laser comprising a light emitting face, the light emitting face facing the collimating element.

5. The laser projection module of claim 4, further comprising a fixture for securing the edge-emitting laser to the substrate assembly.

6. The laser projection module of claim 5, wherein the mounting member comprises a sealant, the sealant is disposed between the edge-emitting laser and the substrate assembly, and the sealant is a thermal conductive adhesive.

7. The laser projection module of claim 5, wherein the fixture includes a support frame, the support frame being disposed on the base plate assembly, the edge-emitting laser being secured to the support frame.

8. A depth camera, comprising:

the laser projection module of any of claims 1-7;

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

9. The depth camera as claimed in claim 8, wherein the processor is further configured to determine an operating status of the laser projection module according to the detection signal of the detection element to control the light source of the laser projector to emit or turn off.

10. An electronic device, comprising:

a housing; and

the depth camera of claim 8 or 9, disposed within and exposed from the housing to acquire a depth image.