CN108445644A - Laser projection module, depth camera and electronic device - Google Patents
Laser projection module, depth camera and electronic device Download PDFInfo
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- CN108445644A CN108445644A CN201810674257.3A CN201810674257A CN108445644A CN 108445644 A CN108445644 A CN 108445644A CN 201810674257 A CN201810674257 A CN 201810674257A CN 108445644 A CN108445644 A CN 108445644A
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- lens barrel
- projection module
- laser projection
- protection cap
- optical element
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geophysics (AREA)
- Lens Barrels (AREA)
Abstract
Lens barrel, diffraction optical element, protection cap, pressure sensor and the detection circuit that electronic device, depth camera and laser projection module disclosed by the invention include board unit, is arranged on board unit.Diffraction optical element is arranged in lens barrel.Protection cap is combined with lens barrel and blocks diffraction optical element.Pressure sensor is arranged between lens barrel and protection cap and is under pressure.Pressure sensor is connected in detection circuit and can form measure loop.Laser projection module passes through setting detection circuit and the pressure sensor being connected in detection circuit; detection circuit is by detecting whether the electric signal on pressure sensor changes; so as to determine whether protection cap (diffraction optical element) falls off from lens barrel; when detection circuit detects that the electric signal on pressure sensor changes; laser projection module, which is stopped, to be sent out laser to avoid laser projection module and burns user, and the security level that user uses laser projection module is improved.
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
Laser projection module needs that diffraction optical element (diffractive is arranged in the transmitting light path of laser
Optical elements, DOE), and diffraction optical element is usually adhered directly to by glue on the lens barrel of laser projection module,
And glue is easy failure, causes diffraction optical element to fall off, if the laser projection after diffraction optical element falls off from lens barrel
Module also emits laser, then is easy the user that burns after laser is directly launched without diffraction optical element.
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, including：
Board unit；
Lens barrel on the board unit is set；
Diffraction optical element, the diffraction optical element are arranged in the lens barrel；
Protection cap, the protection cap are combined with the lens barrel and block the diffraction optical element；
Pressure sensor, the pressure sensor are arranged between the lens barrel and the protection cap and are under pressure；And
Detection circuit, the pressure sensor are connected in the detection circuit and can form measure loop.
The depth camera of embodiment of the present invention includes：
The laser projection module of the above embodiment；
Image acquisition device, described image collector project after the diffraction optical element into object space for acquiring
Laser pattern, the laser pattern is for obtaining depth image.
The electronic device of embodiment of the present invention includes the depth camera described in shell and the above embodiment, the depth
Camera setting is on the housing for acquisition depth image.
Electronic device, depth camera and the laser projection module of embodiment of the present invention are spread out by the way that protection cap is arranged and blocks
Optical element is penetrated, to enable diffraction optical element to be more securely disposed in lens barrel；Meanwhile laser projection module passes through
The pressure sensor that detection circuit is arranged and is connected in detection circuit, detection circuit is by detecting the telecommunications on pressure sensor
Number whether change, so as to determine whether protection cap (diffraction optical element) falls off from lens barrel, when detection circuit is examined
When measuring the electric signal on pressure sensor and changing, laser projection module is stopped to be sent out to avoid laser projection module
Laser is burnt user, and the security level that user uses laser projection module is improved.
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 stereoscopic schematic diagram of the laser projection module of embodiment of the present invention；
Fig. 4 is the floor map of the laser projection module of embodiment of the present invention；
Fig. 5 is the perspective exploded view of the laser projection module of embodiment of the present invention；
Fig. 6 is schematic cross-section of the laser projection module shown in Fig. 4 along line VI -- VI；
Fig. 7 is illustrating along the section of laser projection module line VI -- VI as shown in fig. 4 for another embodiment of the present invention
Figure；
Fig. 8 is schematic cross-section of the laser projection module shown in Fig. 4 along VIII-VIII lines；
Fig. 9 is the enlarged diagram of the parts IX of the laser projection module in Fig. 8；
Figure 10 is the enlarged diagram of the X section of laser projection module shown in fig. 5；
Figure 11 is the stereoscopic schematic diagram of the protection cap of the laser projection module of embodiment of the present invention；
Figure 12 is the part-structure schematic diagram of the laser projection module of embodiment of the present invention；
Figure 13 is the part-structure schematic diagram of the laser projection module of embodiment of the present invention；
Figure 14 is that the laser projection module of embodiment of the present invention removes the floor map after protection cap；
Figure 15 is that the laser projection module of another embodiment of the present invention removes the floor map after protection cap；
Figure 16 is that the laser projection module of a further embodiment of the present invention removes the floor map after protection cap；
Figure 17 is the structural schematic diagram of the diffraction optical element and lens barrel side wall of embodiment of the present invention；
Figure 18 is that the laser projection module of a further embodiment of this invention removes the floor map after protection cap；
Figure 19 is the structural schematic diagram of the diffraction optical element and lens barrel side wall of a further embodiment of this invention.
Figure 20 is the operation principle schematic diagram of the detection circuit of embodiment of the present invention.
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 protection of dust-proof, waterproof, shatter-resistant etc. to depth camera 100, and it is right with depth camera 100 to be offered on shell 200
The hole answered, so that light is pierced by from hole or penetrates shell 200.In other embodiments, depth camera 100 is housed in shell
In 200 and can the stretching out of shell 200, at this point, need not be opened up on shell 200 with depth camera 100 into light direction pair
The hole answered.When needing using depth camera 100, depth camera is reached out of shell 200 outside shell 200；When need not make
When with depth camera 100, depth camera 100 accommodates outside shell 200 to shell 200.In yet another embodiment, depth phase
Machine 100 is housed in the lower section in shell 200 and positioned at display screen, at this point, need not also be opened up on shell 200 and depth camera
100 into the corresponding hole of light direction.
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 Figure 20, the laser projection module 10 of embodiment of the present invention include board unit 11, lens barrel 12,
Diffraction optical element 15, protection cap 16, pressure sensor 19 and detection circuit 18.Lens barrel 12 is arranged on board unit 11.Spread out
Optical element 15 is penetrated to be arranged in lens barrel 12.Protection cap 16 is combined with lens barrel 12 and blocks diffraction optical element 15.Pressure sensing
Device 19 is arranged between lens barrel 12 and protection cap 16 and is under pressure.Pressure sensor 19 is connected in detection circuit 18 and can
Form measure loop.
Pressure sensor 19 is arranged on lens barrel 12 and is connected in detection circuit 18.Protection cap 16 is combined simultaneously with lens barrel 12
For diffraction optical element 15 being limited and (blocking) in lens barrel 12, and when protection cap 16 is combined with lens barrel 12, pressure sensing
Device 19 is clamped on lens barrel 12 by protection cap 16 and by chucking power (pressure).When protection cap 16 falls off from lens barrel 12, protect
Protecting cover 16 discharges (disengaging) pressure sensor 19, to make pressure sensor 19 not by chucking power (pressure), at this point, pressure passes
Sensor 19 changes (for example, resistance becomes larger or becomes smaller) and the electric signal in detection circuit 18 is made to change, detection circuit
Whether 18 can change whether determining protection cap 16 falls off with lens barrel 12 according to the electric signal in detection circuit 18.Specifically, if
Pressure sensor 19 is piezoresistive pressure sensor (foil gauge), when protection cap 16 is combined with lens barrel 12 and by pressure sensor 19
When being clamped between protection cap 16 and lens barrel 12, pressure sensor 19 is under pressure and deforms, at this time pressure sensor 19
Resistance be R1, when protection cap 16 falls off from lens barrel 12, the pressure that pressure sensor 19 is subject to becomes zero, at this time pressure pass
The resistance of sensor 19 is R2, and R2 and R1 is unequal, and detection circuit 18 (being still connected) can be with the electric current in measure loop
It is no to change to determine whether the resistance of pressure sensor 19 changes, and then protection cap 16 can be deduced whether from mirror
It falls off on cylinder 12.Certainly, detection circuit 18 can also according to the curent change in measure loop whether more than a preset value to push away
Measure whether protection cap 16 falls off from lens barrel 12, the preset value is related to resistance change (R2-R1) of pressure sensor 19.
Pressure sensor 19 can also be piezoelectric pressure indicator.Generally, due to which protection cap 16 is used for diffraction optical element 15
It is limited in lens barrel 12, therefore, when protection cap 16 falls off from lens barrel 12, diffraction optical element 15 largely also can be from
It falls off on lens barrel 12, once diffraction optical element 15 falls off, then the light that laser projection module 10 projects can form stronger
Zero order beam, if user is doing recognition of face just, can impaired user eyes.Therefore, in pressure sensor 19 and detection
When circuit 18 detects that protection cap 16 falls off from lens barrel 12, then judges that diffraction optical element 15 also falls off and (in other words, pass through inspection
Measure protection cap 16 to fall off from lens barrel 12, show that diffraction optical element 15 also falls off indirectly), while controlling laser projection module
10 are stopped, and the stopping of laser projection module 10 is made to send out laser, compared to directly detecting after diffraction optical element 15 falls off
Laser projection module 10 just stops for sending out laser, and safety guarantee is shifted to an earlier date, that is, improves protection user and uses and swashs
The security level of light projection module 10.
The laser projection module 10 of embodiment of the present invention is by setting protection cap 16 and blocks diffraction optical element 15, from
And diffraction optical element 15 is enable more to be securely disposed in lens barrel 12；Meanwhile laser projection module 10 is examined by being arranged
Slowdown monitoring circuit 18 and the pressure sensor 19 being connected in detection circuit 18, detection circuit 18 is by detecting on pressure sensor 19
Whether electric signal changes, so as to determine whether protection cap 16 (diffraction optical element 15) falls off from lens barrel 12, when
When detection circuit 18 detects that the electric signal on pressure sensor 19 changes, laser projection module 10 be stopped to avoid
Laser projection module 10 sends out laser and burns user, improves the security level that user uses laser projection module 10.
Please continue to refer to Fig. 3 to Fig. 5, specifically, laser projection module 10 include board unit 11, lens barrel 12, light source 13,
Collimating element 14, diffraction optical element 15, protection cap 16, detection circuit 18 and pressure sensor 19.Light source 13, collimating element 14
It is successively set on diffraction optical element 15 in the light path of light source 13, specifically, the light that light source 13 is sent out sequentially passes through collimation member
Part 14 and diffraction optical element 15.
Fig. 5 and Fig. 6 are please referred to, board unit 11 includes substrate 111 and the circuit board 112 being carried on substrate 111.Substrate
111 for carrying lens barrel 12, light source 13 and circuit board 112.The material of substrate 111 can be plastics, such as poly terephthalic acid
Glycol ester (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.
Fig. 5 to Fig. 9 is please referred to, lens barrel 12 is arranged on board unit 11 and host cavity is collectively formed with board unit 11
121.Specifically, lens barrel 12 can be connect with the circuit board 112 of board unit 11, and lens barrel 12 can be by viscous with circuit board 112
Glue sticking, to improve the air-tightness of host cavity 121.Certainly, lens barrel 12 and the specific connection type of board unit 11 can have it
He, 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, receive
Vessel 121 is formed simultaneously a part for the light path of laser projection module 10.Lens barrel 12 is made of non electrically conductive material, for example, mirror
Cylinder 12 is made of plastics, and plastics include any one in PET, PMMA, PC or PI；Alternatively, lens barrel 12 is made of conductive material
But the outer surface of lens barrel 12 is arranged by insulating layer so that lens barrel 12 is non-conductive.
In embodiments of the present invention, lens barrel 12 is tubular structure, and lens barrel 12 includes lens barrel side wall 122 and limit protrusion 123.
Lens barrel side wall 122 is arranged on board unit 11 and host cavity 121 is collectively formed with board unit 11.Lens barrel side wall 122 includes
Multiple sub- side walls 1221 of lens barrel, the sub- side wall of each lens barrel 1221 are combined with board unit 11, the sub- side wall of multiple lens barrels 1221 according to
It is secondary to connect in a ring and jointly around host cavity 121.The end of the sub- side wall of lens barrel that any two is connected 1221 is collectively formed
One strut angle 1222, forms that there are four strut angles 1222 on the lens barrel 12 of present embodiment.The outer wall of lens barrel side wall 122 can be with
It is formed with positioning and mounting structure, in order to which fixed laser is thrown when laser projection module 10 to be mounted in electronic device 1000
Penetrate the position of module 10.Lens barrel 12 (or lens barrel side wall 122) include the first face 124, the second face 125 and lens barrel side 129, first
Face 124 and the second face 125 are located at the opposite both sides of lens barrel 12, lens barrel side 129 connect the first face 124 and the second face 125 and
Lens barrel side 129 is also around the first face 124, and wherein the one of host cavity 121 is opened on the second face 125, another is opened
Mouth is opened on the first face 124.Second face 125 is combined with circuit board 112, such as glued, and the first face 124 can be used as lens barrel 12
With the faying face of diffraction optical element 15, or the faying face as lens barrel 12 and protection cap 16 etc..Incorporated by reference to Fig. 9 and Figure 10, mirror
The outer wall of cylinder side wall 122 offers glue groove 126, and glue groove 126 can open up from the first face 124 and to the side in the second face 125
To extension.
Fig. 8 and Fig. 9 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.In the embodiment illustrated in fig. 6, it limits
For position protrusion 123 between the first face 124 and the second face 125, the host cavity 121 between limit protrusion 123 and the second face 125 can
For accommodating collimating element 14, the host cavity 121 between limit protrusion 123 and the first face 124 can be used for accommodating diffraction light
Learn element 15.Meanwhile when assembling laser projection module 10, when diffraction optical element 15 and limit protrusion 123 offset, it can recognize
It is installed in place for diffraction optical element 15, when collimating element 14 and limit protrusion 123 offset, it is believed that collimating element 14 is installed
In place.Limit protrusion 123 includes confined planes 1232, when diffraction optical element 15 is mounted on limit protrusion 123, confined planes
1232 are combined with diffraction optical element 15.
Referring to Fig. 8, 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.
Referring to Fig. 8, collimating element 14 can be optical lens, collimating element 14 swashs for what collimated light source 13 emitted
Light, collimating element 14 are housed in host cavity 121, and collimating element 14 can be directed toward the direction group in the first face 124 along the second face 125
It is attached in host cavity 121.Collimating element 14 includes optical section 141 and mounting portion 142, and mounting portion 142 is used for and lens barrel side wall 122
In conjunction with and fixed collimating element 14, in embodiments of the present invention, optical section 141 includes positioned at the two of 14 opposite both sides of collimating element
A curved surface.
Fig. 8 and Fig. 9 are please referred to, diffraction optical element 15 is mounted on limit protrusion 123, specifically, diffraction optical element
15 are combined with confined planes 1232 to be mounted on limit protrusion 123.The outer surface of diffraction optical element 15 includes top surface 151, bottom
Face 152 and side 153.Top surface 151 and bottom surface 152 are opposite, and side 153 connects top surface 151 and bottom surface 152, when diffraction optics member
When part 15 is mounted on limit protrusion 123, bottom surface 152 is combined with confined planes 1232.In the embodiment of the present invention, shape on bottom surface 152
At there is a diffraction structure, top surface 151 can be smooth plane, and diffraction optical element 15 can will be after collimated element 14 collimates
Laser projection goes out laser pattern corresponding with diffraction structure.Diffraction optical element 15 can be made of glass, it may also be said to by multiple
Plastics (such as PET) are closed to be made.
Fig. 8 and Fig. 9 are please referred to, protection cap 16 is combined with lens barrel 12, and protection cap 16 is for diffraction-limited optical element 15
Position, specifically, protection cap 16 after preventing the combination of diffraction optical element 15 and lens barrel 12 from failing from lens barrel 12 for deviating from.
Protection cap 16 is made from a material that be electrically non-conductive, alternatively, protection cap 16 is made of an electrically conducting material and the surface of protection cap 16 is provided with
Insulating layer.Incorporated by reference to Figure 11, protection cap 16 includes protection roof 161 and protective side wall 162.
Spread out in other words the opposite both sides that protection roof 161 is located at diffraction optical element 15 with limit protrusion 123
It penetrates optical element 15 to be located between limit protrusion 123 and protection roof 161, in this way, even if diffraction optical element 15 and limit convex
It plays 123 combination to fail, due to protecting the restriction effect of roof 161, diffraction optical element 15 will not deviate from.Protect roof
161 offer light hole 1611, and the position of light hole 1611 is corresponding with diffraction optical element 15, and laser successively passed through unthreaded hole
1231, it is projected from laser projection module 10 after diffraction optical element 15 and light hole 1611.In embodiments of the present invention, it protects
The global shape of roof 161 is rounded rectangular, and light hole 1611 can rounded, rectangle, ellipse, the shapes such as trapezoidal.Such as
In embodiment shown in fig. 6, when protection cap 16 is combined with lens barrel 12, protection roof 161 offsets with the first face 124, further
Ground, protection roof 161 can also be combined with the first face 124 by way of gluing etc..
Fig. 9 to Figure 11 is please referred to, the periphery of 162 self-shield roof 161 of protective side wall extends, and protection cap 16 is located at lens barrel
On 12, protective side wall 162 is fixedly connected with lens barrel side wall 122.Protective side wall 162 includes protection that multiple head and the tail connect successively
Side wall 1621, each protects sub- side wall 1621 to be fixedly connected with lens barrel side wall 122, and sub- side wall 1621 is each protected to be respectively formed on
There is dispensing hole 163.The position in dispensing hole 163 is corresponding with the position of glue groove 126, after protection cap 16 is located on lens barrel 12,
Can be after the dispensing into glue groove 126 of dispensing hole 163, glue curing, protective side wall 162 is fixedly connected with lens barrel side wall 122.
In one example, it each protects and offers single dispensing hole 163 on sub- side wall 1621, it is in another example, each to protect
Multiple dispensing holes 163, such as two, three, four etc., in embodiments of the present invention, Mei Gebao are offered on sub- side wall 1621
Protect on sub- side wall 1621 and open up there are two dispensing hole 163, two dispensing holes 163 respectively with two madial walls of glue groove 126
1261 correspond to, and convenient for user to the dispensing simultaneously of the both sides of glue groove 126, improve dispensing speed.Further, glue groove 126
Madial wall 1261 tilts the outer wall of the inner bottom wall 1262 and lens barrel side wall 122 of connection glue groove 126, tilts connection and refers to inside
Wall 1261 and inner bottom wall 1262, the equal out of plumb of outer wall of madial wall 1261 and lens barrel side wall 122, when glue is injected into madial wall
When on 1261, under the guide function of madial wall 1261, glue is easy to flow to the centre position of glue groove 126, accelerates glue
Fill the speed of glue groove 126.
Pressure sensor 19 is arranged on lens barrel 12 and is clamped in centre by protection cap 16 and lens barrel 12.Pressure sensor 19
The opening being opened on the first face 124 that host cavity 121 is not blocked on the first face 124 can be set, at this point, pressure sensing
Device 19 is clamped in by protection roof 161 on the first face 124.Pressure sensor 19 can be piezoresistive pressure sensor or piezoelectric type
Pressure sensor, this implementation are implemented to illustrate so that pressure sensor 19 is piezoresistive pressure sensor as an example.In other implementations
In mode, first electrode plate 191 can also be arranged on lens barrel side 129, at this point, 19 protected side wall 162 of pressure sensor
It is clamped on lens barrel side 129.
Incorporated by reference to Fig. 5 and Figure 20, detection circuit 18 is formed on board unit 11 and lens barrel 12, and pressure sensor 19 connects
In detection circuit 18 and measure loop can be formed.Specifically, detection circuit 18 includes detection circuit 181, resistive element 182
And detection device 183.Detection circuit 181 is formed on board unit 11 and lens barrel 12, and detection circuit 181 includes the first detection
Circuit 1811 and second detects sub-line road 1812, and the first detection sub-line road 1811 is formed on board unit 11 and lens barrel 12 and connects
One end of pressure sensor 19 is connect, the second detection sub-line road 1812 is also formed on board unit 11 and lens barrel 12 and connects pressure
The other end of sensor 19, the second detection sub-line road 1812 and the first detection sub-line road 1812 are spaced and are arranged.Resistive element 182 connects
It is connected in detection circuit 181 and connects with pressure sensor 19, resistive element 182 can be resistance.Detection device 183 is connected to
It detects in circuit 181, when it is voltmeter to detect device 183, detection device 183 is in parallel with resistive element 182 and for detecting
The voltage at 182 both ends of resistive element；When it is ammeter to detect device 183, detection device 183 is connected simultaneously with resistive element 182
For detecting the electric current for flowing through resistive element 182.Specifically, when the voltage or electric current that detection device 183 detects do not become
When changing (variable quantity of voltage or electric current is no more than a preset value in other words), illustrate that the electric current for flowing through resistive element 182 does not become
Change, the resistance value for further relating to pressure sensor 19 does not change, to deduce protection cap 16 not from lens barrel 12
It falls off；When the voltage or electric current that detection device 183 detects change, (variable quantity of voltage or electric current is more than one pre- in other words
If value) when, illustrate that the electric current for flowing through resistive element 182 changes, the resistance value for further relating to pressure sensor 19 has occurred
Variation, falls off to deduce protection cap 16 from lens barrel 12.Therefore, detection circuit 18 can be according to the electricity in detection circuit 18
Whether signal (electric current) changes whether determining protection cap 16 falls off with lens barrel 12.Certainly, detection circuit 18 can also be according to detection
The variable quantity of electric signal in circuit 18 determines whether protection cap 16 falls off with lens barrel 12, the variable quantity and pressure of the electric signal
Change in resistance amount of the sensor 19 before and after protection cap 16 falls off from lens barrel 12 is related.In other embodiments, detector
Part 183 can also be directly used in the current or voltage of detection pressure sensor 19, at this point, can be not provided with electricity in detection circuit 18
Resistance element 182.
In present embodiment, the first detection sub-line road 1811 being formed on lens barrel 12 is located at the lens barrel side of lens barrel 12
It is distributed on 129 and along a strut angle 1222 of lens barrel 12, the second detection sub-line road 1812 being formed on lens barrel 12 is located at
Be distributed on the lens barrel side 129 of lens barrel 12 and along another strut angle 1222 of lens barrel 12, the first detection sub-line road 1811 with
Second detection sub-line road 1812 can pass through any one or more mode electricity in welding, shrapnel connection, grafting, conductive adhesive
Property is connected to the opposite end of pressure sensor 19.The first detection sub-line road 1811 being formed on lens barrel 12 and the second detection
Circuit 1812 can be separately positioned on two strut angles 1222 of the opposite end of the sub- side wall of a lens barrel 1221；Alternatively, shape
It can be separately positioned on by different lens barrels from the second detection sub-line road 1812 at the first detection sub-line road 1811 on lens barrel 12
On two strut angles 1222 that sub- side wall 1221 is formed；The first detection sub-line road 1811 and the second detection being formed on lens barrel 12
Sub-line road 1812 can also be arranged on the same strut angle 1222.Certainly, the first detection sub-line road 1811 and the second detection
Circuit 1812 can also be formed in protection cap 16, at this point, detection circuit 181, resistive element 182 and detection device 183 are constituted
Detection circuit 18 be arranged in protection cap 16, pressure sensor 19 is also disposed on protection cap 16 or lens barrel 12 and is connected to
In detection circuit 18, and when protection cap 16 is normally located on lens barrel 12, pressure sensor 19 is under pressure.
To sum up, in the electronic device 1000 of embodiment of the present invention, since protection cap 16 is combined with lens barrel 12, protection cap 16
Protection roof 161 and limit protrusion 123 together diffraction-limited optical element 15 position, diffraction optical element 15 will not be along going out
Light direction falls off, and avoids laser without launching after diffraction optical element 15, protects user, improves safety.Meanwhile swashing
For light projection module 10 by setting detection circuit 18 and the pressure sensor 19 being connected in detection circuit 18, detection circuit 18 is logical
Whether the electric signal crossed on detection pressure sensor 19 changes, so as to determine protection cap 16 (diffraction optical element 15)
Whether fall off from lens barrel 12, when detection circuit 18 detects that the electric signal on pressure sensor 19 changes, laser is thrown
It penetrates module 10 and is stopped and send out laser to avoid laser projection module 10 and burn user, improve user and use laser projection module
10 security level.
Referring to Fig. 7, in some embodiments, limit protrusion 123 can also be formed in the top of lens barrel 12, specifically
The confined planes 1232 on ground, limit protrusion 123 can be overlapped with the first face 124, and diffraction optical element 15 is mounted on limit protrusion 123
When upper, diffraction optical element 15 is combined with the first face 124.At this point, protection roof 161 offsets with diffraction optical element 15, protect
Diffraction optical element 15 is clamped with limit protrusion 123 in roof 161 jointly.In this way, the structure of lens barrel 12 is simple, diffraction optical element
15 are easily mounted on limit protrusion 123.
Fig. 9 to Figure 11 is please referred to, in some embodiments, protection cap 16 further includes that self-shield side wall 162 is inwardly projecting
Elasticity the first hook 164, lens barrel 12 further includes the second hook 127 outwardly protruded from the inner bottom wall 1262 of glue groove 126,
When protection cap 16 is located on lens barrel 12, the first hook 164 is engaged with the second hook 127 is detached from lens barrel to limit protection cap 16
12。
Specifically, the first hook 164 is corresponding with the position of the second hook 127, is located on lens barrel 12 by protection cap 16
During, the first hook 164 and the second hook 127 offset and elastic deformation occur, after protection cap 16 is installed in place, first
Hook 164 and the second hook 127 are engaged, and can be with tactile feedback and " clatter " sound being engaged into place.In this way, protection cap 16
Combined with lens barrel 12 it is more reliable, can be first by the first hook 164 and the and before being bonded protection cap 16 and lens barrel 12 with glue
Two hooks 127 are engaged, and the relative position of protection cap 16 and lens barrel 12 can be effectively fixed, and are conducive to progress for dispensing glue.
Fig. 9 to Figure 11 is please referred to, in some embodiments, sub- side wall 1621 is each protected to be respectively formed on the first hook
164.It is corresponding, the second hook 127, the position of the second hook 127 and the first hook 164 are also both provided in multiple glue grooves 126
Correspondence is set, multiple first hooks 164 are engaged simultaneously with corresponding second hook 127, and the combination of protection cap 16 and lens barrel 12 more may be used
It leans on.Specifically, the first hook 164 can be corresponding with the centre position of sub- side wall 1621 is protected, and the second hook 127 can be with appearance glue
The centre position of slot 126 corresponds to.When the sub- side wall of each protection 1621 is formed at least two dispensing holes 163, the first hook 164
Between at least two dispensing holes 163, more specifically, each protecting at least two dispensing holes, 163 phase on sub- side wall 1621
It is symmetrical for the first hook 164.In this way, being flowed respectively in the both sides of the first hook 164 and the second hook 127 convenient for glue
It is dynamic, and the glue quantity of both sides is suitable, cohesive force is more uniform.
Fig. 9 and Figure 11 are please referred to, in some embodiments, protective side wall 162 is in position corresponding with the first hook 164
Offer avoid holes 165.During protection cap 16 is located at lens barrel 12, the first hook 164 and the second hook 127 offset and
When elastic deformation occurs for the first hook 164, avoid holes 165 provide deformation space for the elastic deformation of the first hook 164, that is, the
One hook 164 occurs elastic deformation and stretches into avoid holes 165.Specifically, when the first hook 164 and the second hook 127 offset, the
Elastic deformation occurs outward for one hook 164, and the first hook 164 stretches into avoid holes 165 and moved to avoid with protective side wall 162
Interference, in addition, the mated condition that user observes the first hook 164 and the second hook 127 by avoid holes 165 is also allowed for, such as
Judge whether the first all hooks 164 is good with the occlusion of corresponding second hook 127.
Fig. 9 and Figure 10 are please referred to, in some embodiments, the second hook 127 is formed with guide ramp 1271, along protection
Lid 16 is inserted in the direction of lens barrel 12, and guide ramp 1271 is far from inner bottom wall 1262, during protection cap 16 is located at lens barrel 12,
First hook 164 offsets with guide ramp 1271.Since guide ramp 1271 is tilted relative to inner bottom wall 1262, the first hook
164 and second hook 127 coordinate during, the resist force for the second hook 127 that the first hook 164 is subject to slowly continuously increases
Greatly, the deformation quantity of the first hook 164 also continuously becomes larger, and the first hook 164 is easy to engage with the second hook 127.
Referring to Fig. 9, in some embodiments, the first positioning region 128, diffraction optical element 15 are formed on lens barrel 12
Outer surface on be formed with the second positioning region 154, and if only if the bottom surface of diffraction optical element 15 152 and 123 knot of limit protrusion
When conjunction, the first positioning region 128 and the second positioning region 154 coordinate.It is appreciated that the bottom surface 152 and top surface of diffraction optical element 15
151 structure is different, and bottom surface 152 also differs the effect of laser with top surface 151, when in use, if by diffraction optics member
Part 15 is anti-loaded (top surface 151 is combined with limit protrusion 123), and diffraction optical element 15 goes out the laser pattern of needs by diffraction is unable to,
Laser is even also resulted in concentrate transmitting and be easy the user that burns.First positioning region 128 of present embodiment and the second positioning region
154 only can correctly coordinate when bottom surface 152 is combined with limit protrusion 123, and matching when diffraction optical element 15 and lens barrel 12
When conjunction relationship is not that bottom surface 152 is combined with the confined planes 1232 of limit protrusion 123, the first positioning region 128 and the second positioning region 154
Cannot correctly it coordinate and user is readily appreciated that.In this way, preventing 15 setup error of diffraction optical element.
Referring to Fig. 9, in some embodiments, the first positioning region 128 includes the first chamfering 1281, the first chamfering 1281
It is formed in limit protrusion 123 and 122 intersection of lens barrel side wall, specifically, the first chamfering 1281 is formed in confined planes 1232 and mirror
122 intersection of cylinder side wall.Second positioning region 154 includes the second chamfering 1541, and the second chamfering 1541 is formed in diffraction optical element
15 bottom surface 152 and 153 intersection of side.First chamfering 1281 with the angle of inclination of the second chamfering 1541 can be it is equal,
If being appreciated that user is anti-loaded by diffraction optical element 15, top surface 151 will offset with the second chamfering 1541, lead to diffraction light
Element 15 is padded by the second chamfering 1541, and user is readily appreciated that diffraction optical element 15 is anti-loaded, therefore the first chamfering 1281
It can be anti-loaded to avoid diffraction optical element 15 with the second chamfering 1541.
Please refer to Fig.1 2, in certain embodiments, the first positioning region 128 includes the confined planes being formed on confined planes 1232
Recess 1282, the second positioning region 154 includes the bottom surface convex block 1542 protruded from bottom surface 152, when bottom surface 152 and limit protrusion 123
In conjunction with when, bottom surface convex block 1542 stretch into confined planes recess 1282 in.Specifically, bottom surface convex block 1542 and confined planes recess 1282
Position corresponds to, and bottom surface convex block 1542 is equal with the quantity of confined planes recess 1282, and the shape of bottom surface convex block 1542 can be round
Column, round table-like, prism-shaped etc., it will be understood that if user is anti-loaded by diffraction optical element 15, bottom surface 152 is upward and bottom surface
Out-of-flatness after convex block 1542 makes diffraction optical element 15 install, user are readily appreciated that diffraction optical element 15 is anti-loaded, therefore
Bottom surface convex block 1542 can be anti-loaded to avoid diffraction optical element 15 with confined planes recess 1282.
3 are please referred to Fig.1, in some embodiments, the first positioning region 128 includes the confined planes protruded from confined planes 1232
Convex block 1283, the second positioning region 154 includes the bottom surface recess 1543 for being formed in bottom surface 152, when bottom surface 152 and limit protrusion 123
In conjunction with when, confined planes convex block 1283 stretch into bottom surface recess 1543 in.Specifically, confined planes convex block 1283 and bottom surface recess 1543
Position corresponds to, and confined planes convex block 1283 is equal with the quantity of bottom surface recess 1543, and the shape of confined planes convex block 1283 can be
Cylindric, round table-like, prism-shaped etc., it will be understood that if user is anti-loaded by diffraction optical element 15, confined planes convex block 1283 will
It offsets with bottom surface 152, causing diffraction optical element 15 to be limited, face convex block 1283 is padded, and user is readily appreciated that diffraction optics member
Part 15 is anti-loaded, therefore confined planes convex block 1283 can be anti-loaded to avoid diffraction optical element 15 with bottom surface recess 1543.
4 are please referred to Fig.1, in some embodiments, the first positioning region 128 includes the lens barrel for being formed in lens barrel side wall 122
Recess 1284, the second positioning region 154 include the side convex block 1544 that the side 153 of self-diffraction optical element 15 outwardly protrudes, when
When bottom surface 152 is combined with limit protrusion 123, side convex block 1544 stretches into lens barrel recess 1284.Side convex block 1544 and lens barrel
The position of recess 1284 corresponds to, and side convex block 1544 is equal with the quantity of lens barrel recess 1284, and side convex block 1544 is parallel
In the shape that the plane of bottom surface 152 intercepts can be rectangle, semicircle, triangle, it is trapezoidal, round in it is one or more.It can
To understand, if user is anti-loaded by diffraction optical element 15, side convex block 1544 will offset with lens barrel side wall 122, lead to diffraction
Optical element 15 can not be mounted on limit protrusion 123, and user is readily appreciated that diffraction optical element 15 is anti-loaded, therefore side is convex
Block 1544 can be anti-loaded to avoid diffraction optical element 15 with lens barrel recess 1284.
Specifically, 4 are please referred to Fig.1, in some embodiments, side 153 includes the sub- side that multiple head and the tail connect successively
Face 1531, lens barrel recess 1284 and the quantity of side convex block 1544 are single.Side convex block 1544 is formed in sub- side 1531
Centre position except other positions.That is, when the quantity of side convex block 1544 is one, side convex block 1544 can
With the other positions being opened in except 1531 centre position of sub- side, when preventing user that diffraction optical element 15 is anti-loaded, side
Convex block 1544 still can extend into lens barrel recess 1284 the case where occur, it is anti-loaded to further avoid diffraction optical element 15.
5 are please referred to Fig.1, in some embodiments, lens barrel recess 1284 is equal and equal with the quantity of side convex block 1544
To be multiple, identical, the different side convex block of the shape of the shape of each side convex block 1544 and corresponding lens barrel recess 1284
1544 shape differs.The foreign steamer for referring to side convex block 1544 identical as the shape of lens barrel recess 1284 of side convex block 1544
It is wide identical as the hollow shape of lens barrel recess 1284.In the present embodiment, due to the shape not phase of different side convex blocks 1544
Together, not mutual corresponding side convex block 1544 cannot be fully mated since shape is different from lens barrel recess 1284, and user is easy
Discover whether diffraction optical element 15 is correctly installed.
6 are please referred to Fig.1, in some embodiments, side 153 includes the sub- side 1531 that multiple head and the tail connect successively,
Lens barrel recess 1284 is equal with the quantity of side convex block 1544 and is multiple, and multiple side convex blocks 1544 are not in relation to any one
The centre position of sub- side 1531 is symmetrical.In embodiment as shown in figure 16, diffraction optical element 15 is whole to be square, side
153 include four sub- sides 1531, and the quantity of side convex block 1544 is two and is respectively positioned on a sub- side 1531, two sides
The centre position that face convex block 1544 is not in relation to any one sub- side 1531 is symmetrical.Certainly, side convex block 1544 is in certain sub- side
Quantity on face 1531 can also be one, and side convex block 1544 is also distributed on other sub- sides 1531, but multiple
The centre position that side convex block 1544 is not in relation to any one sub- side 1531 is symmetrical.In this way, when user is intended to diffraction optics member
When part 15 turns installation, at least one side convex block 1544 can offset with lens barrel side wall 122, and user is readily appreciated that diffraction optics
Element 15 is anti-loaded.
6 are please referred to Fig.1, in some embodiments, lens barrel recess 1284 is equal and equal with the quantity of side convex block 1544
To be multiple, multiple non-equiangularly spaced distributions of side convex block 1544.Specifically, when the quantity of side convex block 1544 is two,
Two side convex blocks 1544 are not in respectively 180 degree with the angle of the line at the center of diffraction optical element 15；When side is convex
The quantity of block 1544 be three when, adjacent two side convex blocks 1544 respectively with the line at the center of diffraction optical element 15
Angle is not all in 120 degree.In this way, when user is intended to diffraction optical element 15 turning installation, at least one side is convex
Block 1544 can offset with lens barrel side wall 122, and user is readily appreciated that diffraction optical element 15 is anti-loaded.
7 are please referred to Fig.1, in some embodiments, the direction along top surface 151 to bottom surface 152, the ruler of side convex block 1544
Very little to be gradually reduced, the size of lens barrel recess 1284 is gradually reduced.Further, the full-size of side convex block 1544 is more than lens barrel
The minimum dimension of recess 1284, when user is intended to diffraction optical element 15 turning installation, side convex block 1544 cannot be stretched completely
Enter in lens barrel recess 1284, side convex block 1544 can be padded by diffraction optical element 15, and user is readily appreciated that diffraction optics member
Part 15 is anti-loaded.
8 are please referred to Fig.1, in some embodiments, the first positioning region 128 includes the lens barrel protruded from lens barrel side wall 122
Convex block 1285, the second positioning region 154 includes the side-facing depressions 1545 for being formed in side 153, when bottom surface 152 and limit protrusion 123
In conjunction with when, lens barrel convex block 1285 stretches into side-facing depressions 1545.Lens barrel convex block 1285 is corresponding with the position of side-facing depressions 1545, and
Lens barrel convex block 1285 is equal with the quantity of side-facing depressions 1545, and lens barrel convex block 1285 is parallel to what the plane of bottom surface 152 intercepted
Shape can be rectangle, semicircle, triangle, it is trapezoidal, round in it is one or more.If being appreciated that user by diffraction
Optical element 15 is anti-loaded, and lens barrel convex block 1285 will offset with diffraction optical element 15, cause diffraction optical element 15 that can not install
On limit protrusion 123, user is readily appreciated that diffraction optical element 15 is anti-loaded, therefore lens barrel convex block 1285 and side-facing depressions
1545 can be anti-loaded to avoid diffraction optical element 15.
9 are please referred to Fig.1, in some embodiments, the direction along top surface 151 to bottom surface 152, the ruler of side-facing depressions 1545
Very little gradual increase, the size of lens barrel convex block 1285 gradually increase.Further, the full-size of lens barrel convex block 1285 is more than side
The minimum dimension of recess 1545, when user is intended to diffraction optical element 15 turning installation, lens barrel convex block 1285 cannot be stretched completely
Enter in lens barrel recess 1284, lens barrel convex block 1285 can be padded by diffraction optical element 15, and user is readily appreciated that diffraction optics member
Part 15 is anti-loaded.
Fig. 5 and Figure 20 is please referred to, in some embodiments, laser projection module 10 further includes processing chip 60, processing
Chip 60 is connected in detection circuit 18 and forms measure loop with pressure sensor 19.Processing chip 60 can detect pressure biography
Whether the electric signal on sensor 19 changes, so that it is determined that whether protection cap 16 (diffraction optical element 15) is de- from lens barrel 12
It falls.Specifically, when protection cap 16 is fixed on lens barrel 12,60 electric signal of processing chip is transferred to by pressure sensor 19 and is kept
It is constant；When protection cap 16 falls off from lens barrel 12, pressure sensor 19 changes (for example, resistance changes), by pressing
The electric signal that force snesor 19 is transferred to processing chip 60 changes (electric signal becomes strong or dies down).Processing chip 60 can be set
It sets on the mainboard of electronic device 1000, processing chip 60 can be linked together by connector 17 and detection circuit 18.At it
In his embodiment, the processor 30 in depth camera 100 can be used as the processing chip 60 in present embodiment, also
It is to say, processor 30 not only can be used for handling laser pattern and detect whether protection cap 16 connects to obtain depth image but also can be used for
It is connected in detection circuit 18, at this point, processing chip 60 need not be additionally arranged in laser projection module 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 (13)
1. a kind of laser projection module, which is characterized in that including：
Board unit；
Lens barrel on the board unit is set；
Diffraction optical element, the diffraction optical element are arranged in the lens barrel；
Protection cap, the protection cap are combined with the lens barrel and block the diffraction optical element；
Pressure sensor, the pressure sensor are arranged between the lens barrel and the protection cap and are under pressure；And
Detection circuit, the pressure sensor are connected in the detection circuit and can form measure loop.
2. laser projection module according to claim 1, which is characterized in that the lens barrel includes close to lens barrel side wall, institute
It includes being located at the first face close to the protection cap side and the lens barrel side around first face, the guarantor to state lens barrel side wall
Protecting cover includes opposite with first face protection roof and the protective side wall that extends from the periphery of the protection roof, the pressure
Force snesor is arranged between first face and the protection roof.
3. laser projection module according to claim 1, which is characterized in that the lens barrel includes close to lens barrel side wall, institute
It includes being located at the first face close to the protection cap side and the lens barrel side around first face, the guarantor to state lens barrel side wall
Protecting cover includes opposite with first face protection roof and the protective side wall that extends from the periphery of the protection roof, the pressure
Force snesor is arranged between the lens barrel side and the protective side wall.
4. according to the laser projection module described in claim 1-3 any one, which is characterized in that the detection circuit includes electricity
Resistance element and detection device, the resistive element are connected with the pressure sensor, the detection device and the resistive element
In parallel or series.
5. according to the laser projection module described in claim 1-3 any one, which is characterized in that the laser projection module is also
Including processing chip, the processing chip is connected in the detection circuit and forms the measure loop with the protection cap.
6. laser projection module according to claim 1, which is characterized in that the lens barrel includes lens barrel side wall, the mirror
Cylinder side wall is arranged on the board unit and host cavity is collectively formed with the board unit, and the lens barrel includes from the mirror
The inwardly projecting limit protrusion of cylinder side wall；The laser projection module further includes：
Light source, the light source are arranged on the board unit and for emitting laser to the host cavity；And
Collimating element, the collimating element are housed in the host cavity；
The diffraction optical element is mounted on the limit protrusion, the light source, the collimating element and the diffraction optics
Element is successively set in the light path of the light source；
The protection cap includes protection roof, and the protection roof offers light hole, the light hole and the diffraction optics
Element corresponds to, and the diffraction optical element is located between the limit protrusion and the protection roof.
7. laser projection module according to claim 6, which is characterized in that the protection cap further includes being pushed up from the protection
The protective side wall that the periphery of wall extends, the protection cap are located on the lens barrel, the protective side wall and the lens barrel side wall
It is fixedly connected.
8. laser projection module according to claim 7, which is characterized in that the outer wall of the lens barrel side wall offers appearance glue
Slot, protective side wall position corresponding with the glue groove offer dispensing hole, with allow glue by the dispensing hole into
Enter the glue groove.
9. laser projection module according to claim 8, which is characterized in that the protection cap further includes from the protection side
First hook of the inwardly projecting elasticity of wall, the lens barrel further include the second card outwardly protruded from the inner bottom wall of the glue groove
It hooks, when the protection cap is located on the lens barrel, first hook engages with second hook.
10. laser projection module according to claim 9, which is characterized in that the protective side wall blocks with described first
It hooks corresponding position and offers avoid holes, the avoid holes are used for during the protection cap is located at the lens barrel, institute
It states the first hook and second hook offsets and first hook occurs to provide deformation space when elastic deformation.
11. laser projection module according to claim 9, which is characterized in that second hook is formed with guide ramp,
The direction of the lens barrel is inserted in along the protection cap, the guide ramp is gradually distance from the inner bottom wall, and the protection cap is provide with
During the lens barrel, first hook offsets with the guide ramp.
12. a kind of depth camera, which is characterized in that including：
Laser projection module described in claim 1-11 any one；
Image acquisition device, described image collector be used to acquire projected into object space after the diffraction optical element it is sharp
Light pattern, the laser pattern is for obtaining depth image.
13. a kind of electronic device, which is characterized in that including：
Shell；With
Depth camera described in claim 12, the depth camera setting is on the housing for acquisition depth image.
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| CN201810674257.3A CN108445644A (en) | 2018-06-27 | 2018-06-27 | Laser projection module, depth camera and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810674257.3A CN108445644A (en) | 2018-06-27 | 2018-06-27 | Laser projection module, depth camera and electronic device |
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Application publication date: 20180824 |