CN108508687A - Laser projection module, depth camera and electronic device - Google Patents
Laser projection module, depth camera and electronic device Download PDFInfo
- Publication number
- CN108508687A CN108508687A CN201810201610.6A CN201810201610A CN108508687A CN 108508687 A CN108508687 A CN 108508687A CN 201810201610 A CN201810201610 A CN 201810201610A CN 108508687 A CN108508687 A CN 108508687A
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- detection
- projection module
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- hole
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/206—Control of light source other than position or intensity
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
- Studio Devices (AREA)
Abstract
The invention discloses a kind of laser projection modules.Laser projection module includes board unit, lens barrel, light source, collimating element, diffraction optical element and detection device.Lens barrel includes lens barrel side wall, and lens barrel side wall is arranged on board unit and host cavity is collectively formed with board unit.Lens barrel includes from the inwardly projecting limit protrusion of lens barrel side wall, and limit protrusion includes opposite the first confined planes and the second confined planes.The detection through-hole through the first confined planes and the second confined planes is offered on limit protrusion.Detection device includes transmitter and receiver.The both ends installation of transmitter and receiver alignment detection through-hole, and one is mounted on collimating element, another is mounted on diffraction optical element.Transmitter is used for the transmitting detection signal into detection through-hole, and receiver is used to receive the detection signal across detection through-hole.The invention also discloses a kind of depth camera and electronic devices.The safety of laser projection module is higher.
Description
Technical field
The present invention relates to optics and electronic technology fields, more specifically, are related to a kind of laser projection module, depth camera
And electronic device.
Background technology
In laser projecting apparatus, need laser passing through collimating element and diffraction optical element (diffractive optical
Elements, DOE) after re-form laser pattern and launch, in use, collimating element and diffraction optical element may occur
The problems such as shifting, tilt or falling off and user cannot detect and learn in time, cause the laser launched not located correctly
It manages and harm users.
Invention content
A kind of laser projection module of embodiment of the present invention offer, depth camera and electronic device.
The laser projection module of embodiment of the present invention includes：
Board unit；
Lens barrel, the lens barrel include lens barrel side wall, the lens barrel side wall be arranged on the board unit and with the base
Host cavity is collectively formed in board group part, and the lens barrel includes from the inwardly projecting limit protrusion of the lens barrel side wall, the limit convex
It includes the first confined planes and the second confined planes opposite to each other to rise, and is offered through first confined planes and institute on the limit protrusion
State the detection through-hole of the second confined planes；
Light source, the light source are arranged on the board unit and for emitting laser to the host cavity；
Collimating element, the collimating element are housed in the host cavity；
Diffraction optical element, the diffraction optical element are mounted on the opposite with the collimating element of the limit protrusion
Side；With
Detection device, the detection device include transmitter and receiver, and the transmitter and receiver are directed at the inspection
The both ends installation of through-hole is surveyed, and one is mounted on the collimating element, another is mounted on the diffraction optical element, institute
Transmitter is stated for the transmitting detection signal into the detection through-hole, the receiver is used to receive across the detection through-hole
Detect signal.
In some embodiments, the collimating element includes faying face, the faying face and the second confined planes knot
It closes, the diffraction optical element includes mounting surface, and the mounting surface is combined with first confined planes；
The transmitter is arranged on the faying face, and the receiver is arranged on the mounting surface；Or
The transmitter is arranged on the mounting surface, and the receiver is arranged on the faying face.
In some embodiments, the quantity of the detection through-hole is multiple, the quantity of the detection device and the inspection
The quantity of survey through-hole is identical and position corresponds to.
In some embodiments, the transmitter is optical transmitting set and is used to emit detection light, and the receiver is light
Receiver is simultaneously used to receive the detection light across the detection through-hole.
In some embodiments, the inner wall of the detection through-hole is formed with light absorping film, and the light absorping film is for inhaling
Receive the detection light being radiated on the light absorping film.
In some embodiments, the light source includes edge-emitting laser, and the edge-emitting laser includes light-emitting surface,
The light-emitting surface is towards the collimating element.
In some embodiments, the laser projection module further includes fixing piece, and the fixing piece is used for the side
Emitting laser is fixed on the board unit.
In some embodiments, the fixing piece includes sealing, sealing setting the edge-emitting laser with
Between the board unit, the sealing is heat-conducting glue.
In some embodiments, the fixing piece includes at least two resilient support being arranged on the board unit
Receiving space is collectively formed in frame, at least two support frames as described above, and the receiving space is used to accommodate the edge-emitting laser, until
Few two support frames as described above are used to support residence and state edge-emitting laser.
The depth camera of embodiment of the present invention includes：
Laser projection module described in any of the above-described embodiment；
Image acquisition device, described image collector project after the diffraction optical element into object space for acquiring
Laser pattern；With
The processor being connect respectively with the laser projection module and described image collector, the processor is for handling
The laser pattern is to obtain depth image.
The electronic device of embodiment of the present invention includes：
Shell；With
Depth camera described in the above embodiment, the depth camera setting are in the shell and sudden and violent from the shell
Dew is to obtain depth image
In the laser projection module of embodiment of the present invention, depth camera and electronic device, transmitter and receiver one
On collimating element, another is mounted on diffraction optical element, as one in collimating element and diffraction optical element
Or when two correct installation sites of deviation, receiver can detect the exception of detection signal, and user, which can pass through, closes light source etc.
Mode prevents Laser emission from going out harm users.
The additional aspect and advantage of embodiments of the present invention will be set forth in part in the description, partly will be from following
Description in become apparent, or the practice of embodiment through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention is from combining in description of the following accompanying drawings to embodiment by change
It obtains obviously and is readily appreciated that, wherein：
Fig. 1 is the structural schematic diagram of the electronic device of embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the depth camera of embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the laser projection module of embodiment of the present invention；
Fig. 4 is the enlarged diagram of the parts IV of the laser projection module in Fig. 3；
Fig. 5 is the enlarged diagram of another state of the parts IV of the laser projection module in Fig. 3；
Fig. 6 is the enlarged diagram of the another state of the parts IV of the laser projection module in Fig. 3；
Fig. 7 is that the laser projection module of another embodiment of the present invention and the amplification of the parts the IV corresponding position in Fig. 3 are shown
It is intended to；
Fig. 8 to Figure 10 is the part-structure schematic diagram of the laser projection module of embodiment of the present invention.
Main element symbol description：
Electronic device 1000, shell 200, depth camera 100, laser projection module 10, board unit 11, substrate 111, electricity
Road plate 112, lens barrel 12, host cavity 121, lens barrel side wall 122, limit protrusion 123, crosses the limit of unthreaded hole 1231, first at via 113
Face 1232, the second confined planes 1233, detection through-hole 1234, the first face 124, the second face 125, light source 13, edge-emitting laser
131, light-emitting surface 1311, side 1312, collimating element 14, optical section 141, mounting portion 142, faying face 143, diffraction optical element
15, mounting surface 151, detection device 16, transmitter 161, receiver 162, connector 17, fixing piece 18, sealing 181, supporting rack
182, receiving space 183, light absorping film 19, image acquisition device 20, processor 30, projection window 40, acquisition window 50.
Specific implementation mode
Embodiments of the present invention are described further below in conjunction with attached drawing.Same or similar label is from beginning in attached drawing
To the same or similar element of expression or element with the same or similar functions eventually.
In addition, the embodiments of the present invention described below in conjunction with the accompanying drawings are exemplary, it is only used for explaining the present invention's
Embodiment, and be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
Referring to Fig. 1, the electronic device 1000 of embodiment of the present invention includes shell 200 and depth camera 100.Electronics fills
It can be mobile phone, tablet computer, laptop computer, game machine, head aobvious equipment, access control system, automatic teller machine etc. to set 1000, and the present invention is real
It applies example to illustrate so that electronic device 1000 is mobile phone as an example, it will be understood that the concrete form of electronic device 1000 can be it
He, this is not restricted.The setting of depth camera 100 exposes in shell 200 and from shell 200 to obtain depth image, shell
200 can provide the protections such as dust-proof, waterproof, shatter-resistant to depth camera 100, be offered on shell 200 corresponding with depth camera 100
Hole so that light is pierced by from hole or penetrates shell 200.
Referring to Fig. 2, depth camera 100 includes laser projection module 10, image acquisition device 20 and processor 30.Depth phase
It could be formed with projection window 40 corresponding with laser projection module 10, and acquisition corresponding with image acquisition device 20 on machine 100
Window 50.Laser projection module 10 is used to project laser pattern to object space by projecting window 40, and image acquisition device 20 is used
It is acquired by the modulated laser pattern of subject matter in by acquisition window 50.In one example, laser projection module 10 projects
Laser be infrared light, image acquisition device 20 be infrared camera.Processor 30 and laser projection module 10 and image acquisition device
20 are all connected with, and processor 30 is for handling laser pattern to obtain depth image.Specifically, processor 30 is calculated using images match
Method calculates the deviation value of each pixel corresponding with reference pattern of each pixel in the laser pattern, further according to the deviation
Value further obtains the depth image of the laser pattern.Wherein, image matching algorithm can be digital picture correlation (Digital
Image Correlation, DIC) algorithm.It is of course also possible to use other image matching algorithms replace DIC algorithms.Below will
The structure of laser projection module 10 is described further.
Please refer to Fig. 3 and Fig. 4, laser projection module 10 include board unit 11, lens barrel 12, light source 13, collimating element 14,
Diffraction optical element 15 and detection device 16.Light source 13, collimating element 14 and diffraction optical element 15 are successively set on light source 13
Light path on, specifically, the light that light source 13 is sent out sequentially passes through collimating element 14 and diffraction optical element 15.
Board unit 11 includes substrate 111 and the circuit board 112 being carried on substrate 111.Substrate 111 is for carrying lens barrel
12, light source 13 and circuit board 112.The material of substrate 111 can be plastics, such as polyethylene terephthalate
(Polyethylene Glycol Terephthalate, PET), polymethyl methacrylate (Polymethyl
Methacrylate, PMMA), makrolon (Polycarbonate, PC), in polyimides (Polyimide, PI) at least
It is a kind of.That is, the unitary plastic material that any one in PET, PMMA, PC or PI may be used in substrate 111 is made.Such as
This, 111 lighter weight of substrate and have enough support strengths.
Circuit board 112 can be any one in printed circuit board, flexible PCB, Rigid Flex.Circuit board 112
On can offer via 113, can be used for accommodating light source 13 in via 113, the part of circuit board 112 is covered by lens barrel 12,
Another part extends out and can be connect with connector 17, and laser projection module 10 can be connected to electronics dress by connector 17
It sets on 1000 mainboard.
Referring to Fig. 3, lens barrel 12 is arranged on board unit 11 and host cavity 121 is collectively formed with board unit 11.Tool
Body, lens barrel 12 can be connect with the circuit board 112 of board unit 11, and lens barrel 12 can be bonded by viscose glue with circuit board 112,
To improve the air-tightness of host cavity 121.Certainly, lens barrel 12 and the specific connection type of board unit 11 can have other, such as
By being connected together.Host cavity 121 can be used for accommodating the components such as collimating element 14, diffraction optical element 15, host cavity 121
It is formed simultaneously a part for the light path of laser projection module 10.In embodiments of the present invention, lens barrel 12 is in hollow tubular, lens barrel
12 include lens barrel side wall 122 and limit protrusion 123.
Lens barrel side wall 122 surrounds host cavity 121, and the outer wall of lens barrel side wall 122 could be formed with location structure and installation is tied
Structure, in order to which fixed laser projects the position of module 10 when laser projection module 10 to be mounted in electronic device 1000.Mirror
Cylinder 12 includes the first face 124 and the second face 125 opposite to each other, and wherein the one of host cavity 121 is opened on the second face 125,
Another is opened on the first face 124.Second face 125 is combined with circuit board 112, such as glued.
Fig. 3 and Fig. 4 are please referred to, limit protrusion 123 is inwardly projecting from lens barrel side wall 122, and specifically, limit protrusion 123 is certainly
Lens barrel side wall 122 is prominent into host cavity 121.Limit protrusion 123 can be in that continuous cyclic annular or limit protrusion 123 includes
Multiple, multiple limit protrusions 123 are spaced apart.Limit protrusion 123 surrounded unthreaded hole 1231, and receiving can be used as by crossing unthreaded hole 1231
A part for chamber 121, laser penetrated diffraction optical element 15 after passing through unthreaded hole 1231.Limit protrusion 123 includes the first limit
Face 1232 and the second confined planes 1233, the first confined planes 1232 are opposite with the second confined planes 1233.Specifically, limit protrusion 123
Between the first face 124 and the second face 125, the first confined planes 1232 compared with the second confined planes 1233 close to the first face 124, first
Confined planes 1232 and the second confined planes 1233 can be parallel planes.Receipts between first confined planes 1232 and the first face 124
Vessel 121 can be used for accommodating diffraction optical element 15, and the host cavity 121 between the second confined planes 1233 and the second face 125 can
For accommodating collimating element 14.It is offered on limit protrusion 123 through the first confined planes 1232 and the second confined planes 1233
Through-hole 1234 is detected, in embodiments of the present invention, detection through-hole 1234 is spaced with unthreaded hole 1231 is crossed, and detects the center of through-hole 1234
Axis can be straight line.
Referring to Fig. 3, light source 13 is arranged on board unit 11, specifically, light source 13 can be arranged on circuit board 112
And be electrically connected with circuit board 112, light source 13 can also be arranged it is on substrate 111 and corresponding with via 113, at this point it is possible to pass through
Light source 13 is electrically connected by arrangement conducting wire with circuit board 112.Light source 13 is for emitting laser, and laser can be infrared light, at one
In example, light source 13 may include the emitting laser of semiconductor substrate and setting on a semiconductor substrate, and semiconductor substrate is set
It sets on substrate 111, emitting laser can be vertical cavity surface emitting laser (Vertical Cavity Surface
Emitting Laser,VCSEL).Single emitting laser can be arranged in semiconductor substrate, can also be arranged and be swashed by multiple transmittings
The array laser of light device composition, specifically, multiple emitting lasers can be with the shape of regularly or irregularly two-dimensional pattern
Formula is arranged on a semiconductor substrate.
Fig. 3 and Fig. 4 are please referred to, collimating element 14 can be optical lens, and collimating element 14 emits for collimated light source 13
Laser, collimating element 14 is housed in host cavity 121, and collimating element 14 can be directed toward the side in the first face 124 along the second face 125
To being assembled into host cavity 121, specifically, collimating element 14 includes faying face 143, when faying face 143 and the second confined planes
When 1233 combination, it is believed that collimating element 14 is installed in place.Collimating element 14 includes optical section 141 and mounting portion 142, installation
Portion 142 with lens barrel side wall 122 for being combined so that collimating element 14 is fixed in host cavity 121, in embodiments of the present invention, is tied
Conjunction face 143 is an end face of mounting portion 142, and optical section 141 includes two curved surfaces positioned at 14 opposite both sides of collimating element.It is accurate
One of straight element 14 curved surface stretched into unthreaded hole 1231.
Fig. 3 and Fig. 4 are please referred to, diffraction optical element 15 is mounted on limit protrusion 123, specifically, diffraction optical element
15 include mounting surface 151, and mounting surface 151 is combined with the first confined planes 1232 diffraction optical element 15 is mounted on limit protrusion
On 123.Some regions wherein on mounting surface 151 could be formed with diffraction structure, and diffraction structure can be with unthreaded hole 1231 excessively
Position is corresponding and laser diffraction after collimating collimated element 14 goes out laser pattern corresponding with diffraction structure, and mounting surface
Other regions on 151 can be plane and be combined with the first confined planes 1232.Diffraction optical element 15 can be by glass system
At, it may also be said to it is made of composite plastic (such as PET).
Fig. 3 and Fig. 4 are please referred to, detection device 16 includes transmitter 161 and receiver 162.Transmitter 161 and receiver
162 1 are mounted on collimating element 14, another is mounted on diffraction optical element 15, and specifically, transmitter 161 can be set
It sets on faying face 143, and receiver 162 is arranged on mounting surface 151；Or transmitter 161 can be arranged in mounting surface 151
On, and receiver 162 is arranged on faying face 143.Embodiment of the present invention is arranged with transmitter 161 on faying face 143, and
Receiver 162 illustrates for being arranged on mounting surface 151.Transmitter 161 and receiver 162 are directed at detection through-hole 1234
Both ends installation, transmitter 161 is used for that transmitting detection signal, detection signal to pass through detection logical into detection through-hole 1234 from one end
The other end is reached behind hole 1234, and is received by receiver 162.The intensity for the detection signal that receiver 162 is received by analysis,
The information such as phase, to judge whether collimating element 14 and the installation site of diffraction optical element 15 are correct at this time.
Specifically, transmitter 161 can be pinger and for emitting detection sound wave, and receiver 162 can be at this time
It is acoustic receiver and is used to receive the detection sound wave across detection through-hole 1234, detection sound wave can be ultrasonic wave；Transmitter
161 can be optical transmitting sets and be used to emit detection light, and receiver 162 can be optical receiver and be used to receive across inspection at this time
The detection light of through-hole 1234 is surveyed, detection light can be laser.The present invention is optical transmitting set with transmitter 161, and receiver 162 is light
It is illustrated for receiver, and the surface launching of the only face receiver 162 of transmitter 161 detects signal, the only face of receiver 162
The face (receiving plane) of transmitter 161 receives detection signal.In embodiments of the present invention, referring to Fig. 4, working as collimating element 14 and spreading out
When penetrating the position of optical element 15 and being respectively mounted correct, detection signal that transmitter 161 emits pass through detection through-hole 1234 and without
The inner wall reflection of through-hole 1234 is detected, the propagation distance that detection signal reaches receiver 162 is shorter, and detection signal is vertical at this time
It is incident on the receiving plane of receiver 161, the intensity for the detection signal that receiver 162 receives is higher.
Referring to Fig. 5, when collimating element 14 is displaced, tilts or falls off, the detection signal that transmitter 161 emits exists
During detection through-hole 1234, detection signal can be after testing after the inner wall multiple reflections of through-hole 1234 again by receiver
162 receive, detection signal reach receiver 162 propagation distance it is longer, receiver 162 receive detection signal intensity compared with
It is weak.Referring to Fig. 6, when diffraction optical element 15 is displaced, tilts or falls off, the receiving plane no longer face of receiver 162
Transmitter 161, the detection signal that receiver 162 receives be not incident perpendicularly on receiving plane or part receiving plane at this time not
It is aligned with detection through-hole 1234 and does not receive detection signal, the intensity for the detection signal that receiver 162 receives is weaker.Cause
This, receiver 162 is by the intensity for the detection signal for judging to receive it may determine that collimating element 14 and diffraction optical element
Whether 15 be in correct installation site.
Further, incorporated by reference to Fig. 2 and Fig. 3, receiver 162 can will determine that result is converted into electric signal and passes to electricity
The processor 30 of sub-device 1000, processor 30 can control the opening and closing of light source 13 according to the electric signal.Specifically, work as receiver
162 when judging that collimating element 14 and diffraction optical element 15 are in correct installation site, and processor 30 can be sentenced according to this
Disconnected 13 normal luminous of output control light source；When receiver 162 judges collimating element 14 and at least one in diffraction optical element 15
It is a that processor 30 can control light source 13 according to the judging result and close when being not in correct installation site, in order to avoid light source 13
The laser sent out after correctly handling without launching.Detection device 16 can in real time be carried out when laser projection module 10 works
Detection；Can also be to be connected to open command in laser projection module 10, and be detected before light source 13 shines.
To sum up, in the electronic device 1000 of embodiment of the present invention, transmitter 161 and receiver 162 1 are mounted on standard
On straight element 14, another is mounted on diffraction optical element 15, as one in collimating element 14 and diffraction optical element 15
Or when two correct installation sites of deviation, receiver 162 can detect the exception of detection signal, and user, which can pass through, closes light source
Harm users after the modes such as 13 prevent Laser emission from going out.
Referring to Fig. 3, in some embodiments, the quantity of detection through-hole 1234 is multiple, the quantity of detection device 16
It is identical and position is corresponding as the detection quantity of through-hole 1234.Specifically, the quantity of detection through-hole 1234 can be two, three,
Four, five etc., multiple detection through-holes 1234 can surround unthreaded hole 1231 and angularly be uniformly distributed.One detection device 16 with
The position of one detection through-hole 1234 corresponds to, and detection collimating element 14 is multiple detection devices 16 with diffraction optical element 15 jointly
No to be in correct installation site, accuracy is high, and after some 16 failure of detection device, remaining detection device 16 still can
It is enough to meet the needs of detection.
Referring to Fig. 7, in some embodiments, the inner wall of detection through-hole 1234 is formed with light absorping film 19, light absorption
Film 19 is for absorbing the detection light being radiated on light absorping film 19.It is higher to be appreciated that light absorping film 19 has detection light
Absorptivity when 14 run-off the straight of diffraction optical element 15 or collimating element, shifts or falls off and transmitter 161 is caused to occur partially
When shifting, detection light is irradiated on light absorping film 16 and is absorbed, and the amount for the detection light that receiver 162 receives will be greatly decreased,
In this way, even if the amount that deviates of diffraction optical element 15 or collimating element 14 is easy to be detected by detection device 16 if smaller, improve
The detection sensitivity of detection device 16.
Certainly, in other embodiments, when transmitter 161 is pinger, receiver 162 is acoustic receiver
When, the inner wall of detection through-hole 1234 can form sound-absorbing structure, such as the inner wall of detection through-hole 1234 is formed with sound-absorption hole, or set
It is equipped with sound-absorbing foam etc..
Fig. 3 and Fig. 8 are please referred to, in some embodiments, light source 13 includes edge-emitting laser (edge-emitting
Laser, EEL) 131, specifically, edge-emitting laser 131 can be distributed feedback laser (Distributed
Feedback Laser, DFB).Edge-emitting laser 131 is whole to be in the form of a column, and edge-emitting laser 131 is far from board unit 11
One end face is formed with light-emitting surface 1311, and laser is sent out from light-emitting surface 1311, and light-emitting surface 1311 is towards collimating element 14.Using side
Emitting laser 131 is used as light source, and one side edge-emitting laser 131 is smaller compared with the temperature drift of VCSEL array, other direction, by
It is single-point light emitting structure in edge-emitting laser 131, is not necessarily to array of designs structure, makes simple, the light of laser projection module 10
Source cost is relatively low.
Fig. 8 and Fig. 9 are please referred to, in some embodiments, laser projection module 10 further includes fixing piece 18, fixing piece 18
For edge-emitting laser 131 to be fixed on board unit 11.The laser of distributed feedback laser is when propagating, by light
The feedback of grid structure obtains the gain of power.The power for improving distributed feedback laser is needed by increasing Injection Current
And/or increase the length of distributed feedback laser, it can make the power consumption of distributed feedback laser due to increasing Injection Current
Increase and serious problem of generating heat occur, therefore, in order to ensure that distributed feedback laser can work normally, needs to increase
The length of distributed feedback laser causes distributed feedback laser generally in elongate strip structure.When edge-emitting laser 131
Light-emitting surface 1311 towards collimating element 14 when, edge-emitting laser 131 is placed in vertical, since edge-emitting laser 131 is in
Elongate strip structure, edge-emitting laser 131, which is susceptible to, to be fallen, shift or shakes etc. surprisingly, therefore passes through and fixing piece 18 is arranged
Edge-emitting laser 131 can be fixed, prevent edge-emitting laser 131 fall, shift or shake etc. it is unexpected.
Specifically, referring to Fig. 8, in some embodiments, fixing piece 18 includes sealing 181, sealing 181 is arranged on side
Between emitting laser 131 and board unit 11.More specifically, in example as shown in Figure 8, edge-emitting laser 131
Opposite with light-emitting surface 1311 is bonded on one side on board unit 11.In example as shown in Figure 9, edge-emitting laser 131
Side 1312 can also be bonded on board unit 11, sealing 181 wraps the side 1312 of surrounding, can also only adherent side
Some face in face 1312 and board unit 11 or certain several face of bonding and board unit 11.Further, sealing 181 can be
Heat-conducting glue conducts the heat that the work of light source 13 generates into board unit 11.In order to improve radiating efficiency, on substrate 111
Heat emission hole 1111 can also be offered, the heat that light source 13 or the work of circuit board 112 generate can be shed by heat emission hole 1111, be dissipated
Heat-conducting glue can also be filled in hot hole 1111, to further increase the heat dissipation performance of board unit 11.
Referring to Fig. 10, in some embodiments, fixing piece 18 includes at least two be arranged on board unit 11
Receiving space 183 is collectively formed in flexible supporting frames 182, at least two supporting racks 182, and receiving space 183 is for accommodating edge emitting
Laser 131, at least two supporting racks 182 are used to support edge-emitting laser 131, to further prevent edge-emitting laser
131 shake.
In some embodiments, substrate 111 can save, and light source 13 can be directly anchored on circuit board 112 to subtract
The integral thickness of small laser projecting apparatus 10.
In the description of this specification, reference term " certain embodiments ", " embodiment ", " some embodiment party
The description of formula ", " exemplary embodiment ", " example ", " specific example " or " some examples " means in conjunction with the embodiment
Or example particular features, structures, materials, or characteristics described are contained at least one embodiment or example of the present invention.
In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or example.Moreover, description
Particular features, structures, materials, or characteristics can be in any one or more embodiments or example with suitable side
Formula combines.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two,
Three, unless otherwise specifically defined.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification, and the scope of the present invention is limited by claim and its equivalent.
Claims (11)
1. a kind of laser projection module, which is characterized in that including：
Board unit；
Lens barrel, the lens barrel include lens barrel side wall, the lens barrel side wall be arranged on the board unit and with the substrate in batch
Host cavity is collectively formed in part, and the lens barrel includes from the inwardly projecting limit protrusion of the lens barrel side wall, the limit protrusion packet
Opposite the first confined planes and the second confined planes are included, are offered on the limit protrusion through first confined planes and described
The detection through-hole of two confined planes；
Light source, the light source are arranged on the board unit and for emitting laser to the host cavity；
Collimating element, the collimating element are housed in the host cavity；
Diffraction optical element, the diffraction optical element are mounted on one opposite with the collimating element of the limit protrusion
Side；With
Detection device, the detection device include transmitter and receiver, and the transmitter and the receiver alignment detection are logical
The both ends in hole are installed, and one is mounted on the collimating element, another is mounted on the diffraction optical element, the hair
Emitter is used for the transmitting detection signal into the detection through-hole, and the receiver is used to receive the detection across the detection through-hole
Signal.
2. laser projection module according to claim 1, which is characterized in that the collimating element includes faying face, described
Faying face is combined with second confined planes, and the diffraction optical element includes mounting surface, and the mounting surface is limited with described first
Plane combines；
The transmitter is arranged on the faying face, and the receiver is arranged on the mounting surface；Or
The transmitter is arranged on the mounting surface, and the receiver is arranged on the faying face.
3. laser projection module according to claim 1, which is characterized in that the quantity of the detection through-hole is multiple, institute
The quantity for stating detection device is identical as the detection quantity of through-hole and position is corresponding.
4. laser projection module according to claim 1, which is characterized in that the transmitter is optical transmitting set and is used to send out
Detection light is penetrated, the receiver is optical receiver and is used to receive the detection light across the detection through-hole.
5. laser projection module according to claim 4, which is characterized in that the inner wall of the detection through-hole is formed with light suction
Winder, the light absorping film is for absorbing the detection light being radiated on the light absorping film.
6. according to the laser projection module described in claim 1-5 any one, which is characterized in that the light source includes edge emitting
Laser, the edge-emitting laser include light-emitting surface, and the light-emitting surface is towards the collimating element.
7. laser projection module according to claim 6, which is characterized in that the laser projection module further includes fixing
Part, the fixing piece are used to the edge-emitting laser being fixed on the board unit.
8. laser projection module according to claim 7, which is characterized in that the fixing piece includes sealing, the sealing
It is arranged between the edge-emitting laser and the board unit, the sealing is heat-conducting glue.
9. laser projection module according to claim 7, which is characterized in that the fixing piece includes being arranged in the substrate
Receiving space is collectively formed at least two flexible supporting frames on component, at least two support frames as described above, and the receiving space is used
In accommodating the edge-emitting laser, at least two support frames as described above are used to support residence and state edge-emitting laser.
10. a kind of depth camera, which is characterized in that including：
Laser projection module described in any one of claim 1-9；
Image acquisition device, described image collector be used to acquire projected into object space after the diffraction optical element it is sharp
Light pattern；With
The processor being connect respectively with the laser projection module and described image collector, the processor are described for handling
Laser pattern is to obtain depth image.
11. a kind of electronic device, which is characterized in that including：
Shell；With
Depth camera according to any one of claims 10, the depth camera are arranged in the shell and are exposed from the shell to obtain
Take depth image.
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| WO2019165862A1 (en) * | 2018-02-27 | 2019-09-06 | Oppo广东移动通信有限公司 | Laser projection module, depth camera, and electronic device |
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| CN108508687B (en) | 2021-06-18 |
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