CN107167996A - The laser projection module and depth camera adaptively adjusted - Google Patents
The laser projection module and depth camera adaptively adjusted Download PDFInfo
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- CN107167996A CN107167996A CN201710413870.5A CN201710413870A CN107167996A CN 107167996 A CN107167996 A CN 107167996A CN 201710413870 A CN201710413870 A CN 201710413870A CN 107167996 A CN107167996 A CN 107167996A
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- light
- light beam
- projection module
- laser projection
- light source
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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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- 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
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/48—Details of cameras or camera bodies; Accessories therefor adapted for combination with other photographic or optical apparatus
- G03B17/54—Details of cameras or camera bodies; Accessories therefor adapted for combination with other photographic or optical apparatus with projector
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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
- G03B21/2053—Intensity control of illuminating light
-
- 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
Abstract
The present invention proposes a kind of laser projection module adaptively adjusted, including：Light source；Particular optical element, with least one light splitting surface, the light splitting surface is used at least part light beam for reflecting and transmiting the light source transmitting；Pattern maker, receives the light beam at least partly reflecting or transmiting through the light splitting surface, and outwards emitting structural light pattern；Beam detector, for receiving the light beam at least partly by the light splitting surface transmission or reflection, and detects its intensity.The present invention also proposes a kind of depth camera, includes the laser projection module of above-mentioned adaptive adjustment, for the projective structure light beam image into object space.The laser projection module that the present invention is adaptively adjusted, cause laser projection module that there is less volume using the particular optical element with reflection and transmission function, immediately light source is detected in combination with fluorescence detector, so as to further control laser intensity, to avoid damaging human body.
Description
Technical field
The present invention relates to optics and electronic technology field, more particularly to a kind of laser projection module adaptively adjusted and depth
Spend camera.
Background technology
The depth information that depth camera can obtain target realizes 3D scannings, scene modeling, gesture interaction whereby, and current
The RGB camera being widely used is compared, and depth camera is just progressively paid attention to by all trades and professions.For example utilize depth camera and electricity
Somatic sensation television game can be realized depending on combinations such as, computers to reach light in effect that game and body-building is two-in-one, the KINECT of Microsoft, ratio difficult to understand
ASTRA be representative therein.In addition, the tango projects of Google are directed to bringing depth camera into mobile device, such as flat board,
Mobile phone, the usage experience overturned completely is brought with this, such as can realize very real AR game experiencings, it can be used to enter
The functions such as row indoor map is created, navigation.
Core component in depth camera is laser projection module, according to the difference of depth camera species, laser projection mould
The structure of group is also had any different with function, such as the projection module disclosed in patent CN201610977172A is used for into space
Projection speckle patterns are to realize structure light depth survey, and this spot structure light depth camera is also more ripe and extensive at present
The scheme of use.With the continuous extension of depth camera application field, laser projection module by less and less volume and
Constantly evolved in higher and higher performance.
In addition, manufacture in laser projection module, install and use etc. during, can cause laser projection module
Project power and design produces deviation.It is general to may require that laser projection module reaches the laser safety of certain rank in design,
Such as class1 laser safety standards.But deviation occurs in manufacture and installation process, and in addition in use, temperature
Degree have large effect to light source and optical element, may be such that the intensity of laser is too high, do not reach safety standard from
And the human body in perspective view may be damaged, or make it that the intensity of laser is too low, the light beam contrast projected
It is smaller with measurement distance, influence the performance of laser projection module.
The content of the invention
The invention aims to solve laser projection module of the prior art can not reduce volume while it is simultaneous
The problem of turning round and look at detection laser intensity, proposes a kind of laser projection module and depth camera adaptively adjusted.
The laser projection module that the present invention is adaptively adjusted, including：Light source, for launching light beam；Particular optical element, tool
There is at least one light splitting surface, the light splitting surface is used at least part light beam for reflecting and transmiting the light source transmitting；Pattern
Maker, receives the light beam at least partly reflecting or transmiting through the light splitting surface, and outwards emitting structural light pattern；Beam detection
Device, for receiving the light beam at least partly by the light splitting surface transmission or reflection, and detects its intensity.
In some embodiments, the laser projection module adaptively adjusted also includes lens, and the lens are used for
Converge or collimate the light beam of the light source transmitting；Or for converging or collimating the light beam of the light splitting surface reflection or transmission.
In one of embodiment, the lens include plus lens and collimation lens, and the plus lens is used to converge the light
The light beam of source transmitting；The collimation lens is used for the light beam for collimating the light splitting surface reflection or transmission, the particular optical element
It is arranged on the focal position of the plus lens.In another embodiment, the lens include microlens array.
In one embodiment, the beam detector is the component that light intensity signal is converted into electric signal, institute
State the ratio between beam intensity that light beam and the beam detector of pattern maker reception are received and be more than 1, light splitting surface is plane, convex
One kind in face or concave surface.In another embodiment, the laser projection module adaptively adjusted also includes light source control
Device processed, the light source controller receives the beam detector and detects intensity information, and predetermined threshold value performs following operate：
When the luminous intensity exceedes default threshold value, reduce the power of the light source or close the light source；When the luminous intensity
During less than default threshold value, increase the power of the light source.
The present invention also proposes a kind of depth camera, includes the laser projection module of any of the above described adaptive adjustment,
For the projective structure light beam image into object space；Image collecting device, for gathering the structure in object space
Change light beam image；Processor, receives the structured light beam images gathered by described image harvester, and according to the structuring
Light beam image generates the depth image of the object space；It is described to generate the object space according to the structured light beam images
Depth image, refer to calculating the deviation between the structured light beam images and reference beam image using matching algorithm
Value, the depth image is calculated according to the deviation value.
Compared with prior art, beneficial effects of the present invention have：
The laser projection module that the present invention is adaptively adjusted, is made using the particular optical element with reflection and transmission function
Obtaining laser projection module has less volume, and immediately light source can be detected in combination with fluorescence detector, so as to
To take into account the intensity of detection laser while volume is reduced.
Further, the laser projection module that the present invention is adaptively adjusted, in addition to light source controller, receive the light beam
Detector detects intensity information, and predetermined threshold value is so as to be adaptively adjusted the luminous power of LASER Light Source, to avoid pair
Human body is damaged, while also make it that the light beam contrast and measurement distance that project are moderate, does not interfere with laser projection module
Performance.
Further, the laser projection module that adaptively adjusts of the present invention, at the same in particular optical element and light source and
Lens are set further to reduce particular optical element or pattern maker between particular optical element and pattern maker
Volume, and realize the structured light patterns projection of more high-contrast.In addition, can be further using the particular optical element of curved surface
Reduce module thickness and improve reception amount of the beam detector to light beam.
Brief description of the drawings
Fig. 1 is the depth camera system structural representation of one embodiment of the invention.
Fig. 2 is the laser projection modular structure schematic diagram of one embodiment of the invention.
Fig. 3 is the laser projection modular structure schematic diagram of another embodiment of the present invention.
Fig. 4 is the laser projection modular structure schematic diagram of another embodiment of the present invention.
Fig. 5 is the laser projection modular structure schematic diagram of another embodiment of the present invention.
Fig. 6 is the laser projection modular structure schematic diagram of another embodiment of the present invention.
Embodiment
With reference to embodiment and compare accompanying drawing the present invention is described in further details.Wherein identical accompanying drawing
Mark represents identical part, unless stated otherwise.It is emphasized that what the description below was merely exemplary, without
It is to limit the scope of the present invention and its application.
The present invention proposes a kind of optical projection apparatus and the depth camera based on this.Will be to optics in explanation below
Illustrated exemplified by projection arrangement and depth camera, but be not meant to that this optical projection apparatus is only capable of applying in depth phase
In machine, every direct or indirect utilization program is intended to be included in protection scope of the present invention in any other device.
The depth camera side schematic view based on structure light shown in Fig. 1.The main building block of depth camera 101 has optics
Module 104, collection module 105, mainboard 103 and processor 102 are projected, RGB camera is further provided with some depth cameras
107.Optical projection module 104, collection module 105 and RGB camera 107 are generally mounted at same depth camera plane
On, and in same baseline, each module or camera correspond to a light portal 108.Usually, processor 102 is collected
Into on mainboard 103, and optical projection module 104 is connected with collection model 105 by interface 106 with mainboard, in one kind implementation
Interface described in example is FPC interfaces.Wherein, optical projection module is used to project encoded structure light figure into object space
Case, collection module is collected after the structure light image by the processing of processor so as to obtain the depth image of object space.
In one embodiment, structure light image is infrared laser speckle pattern, and pattern has distribution of particles relatively uniform but with very high
Local irrelevance, local irrelevance here refers to that each sub-regions all have higher uniqueness in pattern.It is right
The collection module 105 answered be and the corresponding infrared camera of optical projection module 104.Depth image is obtained using processor specifically
Finger is received after the speckle pattern collected by collection module, by calculating the deviation between speckle pattern and reference speckle pattern
Value further obtains depth image.
Fig. 2 is a kind of embodiment of laser projection module 104 in Fig. 1.Laser projection module 104 includes light source 201, spy
Determine optical element 202, lens 203, pattern maker 204 and fluorescence detector 205.Light source is LASER Light Source, such as side is sent out
Penetrate generating laser or vertical cavity surface generating laser (VCSEL), can also by multiple edge emitting generating lasers or
The array of source of VCSEL compositions, further embodiment is as shown in Figure 6.Particular optical element 202 contains at least one optics table
Face, the optical surface can be reflecting surface, lens face or as having the light splitting surface of certain reflection and transmittance in the present embodiment.
Light splitting surface can be realized in the optical element surface of transparent base by some techniques attaching single or multiple lift optical thin film
Reflection and transmission function, while controlling the ratio of reflection and transmission.Lens 203 provide the effect of collimated light beam, pattern maker
204 are used for generating structure light pattern, in one embodiment, and pattern maker 204 is diffraction optical element (DOE), can also
For elements such as grating, microlens arrays.Lens 203 can be fabricated on same optical element not with pattern maker 204
To reduce volume on coplanar.Beam detector 205 is used to detect the intensity of light beam, such as photo resistance, the pole of photoelectricity two
Pipe, phototriode etc. are any can be converted into light intensity signal the component of electric signal.
Light source 201 launches laser beam, the light splitting surface rear portion through particular optical element 202 reflected after by lens
203 collimations, collimated light beam outwards launches structured light patterns, such as speckle pattern, speckle pattern by DOE204 and after being modulated
In each spot be the result that is expanded of DOE204 alignment collimated optical beams.Another part light beam transmitted through light splitting surface after by optics
Detector 205 is received, and fluorescence detector 205 is not necessarily required to receive the light beam of light source of all transmissions, can also only receiving portion
Transmitted light beam.
Manufacture in laser projection module, install and use etc. during, can cause the projection of laser projection module
Power and design produce deviation.It is general to may require that laser projection module reaches the laser safety of certain rank in design, such as
Class1 laser safety standards.But deviation, in addition in use, temperature pair occur in manufacture and installation process
Light source and optical element have large effect, may be such that laser does not reach safety standard.Therefore in laser projection mould
Light source controller can also be set in group, and light source controller receives light intensity signal detected by beam detector, and default threshold
Value, when light intensity signal is above or below corresponding threshold value, carries out the control to light source.In one embodiment, optics is examined
Survey device 205 to receive light beam and change into electric signal, light source controller receives electric signal and judges whether the electric signal exceedes and presets
Threshold value, if reducing light source power more than if or close light source to prevent stronger laser from being damaged to target body；Another
In one embodiment, light source controller, which is received, judges whether the electric signal is less than default threshold value after electric signal, increase if less than if
Light source power is to improve the projected light beam intensity of laser-projector to improve contrast or measurement distance.
In one embodiment, light source controller can be processor 102, or other components, and light source controller can
To be placed in laser projection module 104, it can also be placed on as processor 102 in depth camera, or even in some realities
Apply in example the part in the outside other equipment that can also be depth camera, such as the computing terminal being connected with depth camera, than
Such as computer, mobile phone, flat board, TV.
In embodiment shown in Fig. 2, what pattern maker 204 was received is through the anti-of the light splitting surface of particular optical element 202
Irradiating light beam, what fluorescence detector 205 was received is the transmitted light beam through the light splitting surface of particular optical element 202.Usually, light beam
Major part is for being projected, it is only necessary to which fraction is detected that the light intensity reflected is greater than the light quantity of transmission,
Preferably, the ratio reflected with transmission, which is more than 9, the i.e. light into pattern maker, will account for more than the 90% of light beam of light source (in theory
There can be the ratio of other any reflections and transmission).It is worth noting that, even if the light of transmissive portion accounts for smaller, this part
Light beam also all can not necessarily be received by fluorescence detector 205, such as in Fig. 2 due to transmitted light beam be diverging, therefore work as
When fluorescence detector is smaller, it is only capable of receiving fractional transmission light beam.Therefore according to the transmissivity and fluorescence detector of light splitting surface
The amount of beam that can be received, the threshold value to be set also can be different.
In embodiment shown in Fig. 2, the light splitting surface using particular optical element 202 will be carried out for the light path of projection pattern
Fold, it is to avoid extend in one direction.Usually the thickness direction of laser projection module is particular optical element 202 and pattern
The direction of the center of maker 204 connection, folding, which is advantageous in that, can reduce the thickness and volume of laser projection module.
In another embodiment, lens 203 and pattern maker 204 and fluorescence detector 205 can also be exchanged position
Put, accordingly, transmissivity and the reflectivity of light splitting surface are also required to be adjusted.Now, transmitted light beam enters pattern maker
204, and the reflected beams carry out fluorescence detector 205.
In embodiment shown in Fig. 3, compared with Fig. 2, the light splitting surface in particular optical element 202 becomes bent by plane
Face, in particular convex surface.When in divergent beams to the particular optical element 202 that light source 201 is launched, the light beam after transmission is convex
Face is converged, and fluorescence detector 205 can be caused to receive more transmitted light beams, in addition, after the reflection on convex surface, light source 201
Light beam is further dissipated so that reach the service area on pattern maker and overlay pattern maker with shorter distance
Domain, so as to advantageously reduce the volume of laser projection module.It is understood that when pattern maker connects the lens that 204 receipts are
When what light beam and fluorescence detector 205 were received is the reflected beams, the light splitting surface of particular optical element 202 can be configured to recessed
Face.
Fig. 4 is the schematic diagram of laser projection module according to another embodiment of the present invention.Compared with Fig. 2,3, in light source
A collimation lens 401 is provided between 201 and particular optical element 202, the collimated lens 401 of light beam are specific after collimating
Optical element 202 reflects, and the reflected beams carry out outwards launching structured light patterns after pattern maker 204.Similarly, in a reality
Apply in example, be additionally provided with fluorescence detector 206, collimated light beam carries out fluorescence detector after being transmitted through particular optical element 202
205.This light path has lacked lens on the thickness direction of laser projection module, thus can further reduce thickness, in addition thoroughly
Irradiating light beam is relatively more by the light beam on collimation thus arrival fluorescence detector 205.
It is understood that in other embodiments, lens 203 in Fig. 2 or Fig. 3 can also by change its with it is specific
The distance between optical element 202, plays the effect of plus lens, reflects or transmits for converging particular optical element 202
Lens 203 in light beam, i.e. Fig. 2 or Fig. 3 may alternatively be plus lens；Collimation lens 401 in Fig. 4 can also be by changing
Become it the distance between with light source 201, play the effect of plus lens, the light beam for converging light source transmitting is saturating in i.e. Fig. 4
Mirror 401 may alternatively be plus lens.After the lens 203 in Fig. 2 or Fig. 3 are replaced by plus lens, pattern maker
204 only need less volume, it is possible to receive more light beam.In addition, when the collimation lens 401 in Fig. 4 is replaced by remittance
After poly- lens, light beam of light source is reached in particular optical element 202 after being converged through plus lens, when particular optical element 202 is set
When putting near the focal spot position (focal plane) or focal spot position of plus lens, for previous embodiment, here specific
Optical element 202 only needs the light beam that less volume can be more, and fluorescence detector 205 can also be arranged to less in addition
Volume is that can receive more transmitted light beam.
Fig. 5 is the schematic diagram of laser projection module according to still another embodiment of the invention.There are two lens to put respectively
Put between light source 201 and particular optical element 202, between pattern maker 204 and particular optical element 202, wherein lens
501 be that plus lens, lens 203 are collimation lens.Light beam of light source reaches particular optical element 202 after being converged through plus lens
On, when particular optical element 202 is arranged near the focal spot position of lens 501 (focal plane) or focal spot position, relative to
For previous embodiment, particular optical element 202 here only needs less volume to receive more light beam, in addition light
Detector 205, which can also be arranged to less volume, can receive more transmitted light beam.Double lens is set in the present embodiment
Double lens imaging can be regarded as by putting, and be lens 501 using double lens in the identical plane of laser projection module 104
When being combined with lens 203, compared with individually using lens 401 or lens 203, double lens imaging will possess lower times magnification
Number.Such as when structured light patterns are speckle pattern, each spot regards the picture of light source as in pattern, when picture multiplication factor compared with
When low, the brightness of spot in speckle pattern, overall contrast will be higher.
It is understood that in another embodiment, lens 501 and lens 203 could be arranged to plus lens, respectively
It is in this embodiment, specific for converging the light beam that the light beam and particular optical element 202 of the transmitting of light source 201 reflect or transmitted
Optical element 202, fluorescence detector 205 and/or pattern maker 204 can be configured to less volume, it is possible to connect
Receive more light beam.
In embodiment shown in Fig. 6, light source 201 is laser array light source, it is therefore preferable to VCSEL array light source, i.e., half
Multiple VCSEL light sources 2012 are arranged with certain arrangement pattern on conductor substrate 2011, arrangement pattern can be that rule can also
For irregular, such as random alignment two-dimensional pattern.In figure only on one-dimensional with 3 VCSEL light sources come example, be actually two
Tie up pattern.Lens 501 are also made up of two parts, one be with the one-to-one microlens array of VCSEL light source 2,012 5011,
Another is plus lens 5012.VCSEL light source light beam by microlens array 5011 each unit collimation after through plus lens
5012 focus in particular optical element 202.In another embodiment, lenticule unit is integrated on VCSEL light source, with reality
Now smaller volume.In another embodiment, microlens array 5011 and 5012 is fabricated on same optics, such as is existed
Two surfaces of optics etch microlens array and lens respectively.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For those skilled in the art, do not taking off
On the premise of from present inventive concept, some equivalent substitutes or obvious modification can also be made, and performance or purposes are identical, all should
When being considered as belonging to protection scope of the present invention.
Claims (10)
1. a kind of laser projection module adaptively adjusted, it is characterised in that including：
Light source, for launching light beam；
Particular optical element, with least one light splitting surface, the light splitting surface is used to reflect and transmit the light source transmitting extremely
Light beam described in small part；
Pattern maker, receives the light beam at least partly reflecting or transmiting through the light splitting surface, and outwards emitting structural light pattern；
Beam detector, for receiving the light beam at least partly by the light splitting surface transmission or reflection, and detects its intensity.
2. the laser projection module according to claim 1 adaptively adjusted, it is characterised in that described also including lens
Lens are used for the light beam for converging or collimating the light source transmitting；Or the lens are used to converging or collimating the light splitting surface reflection
Or the light beam of transmission.
3. the laser projection module according to claim 2 adaptively adjusted, it is characterised in that the lens include convergence
Lens and collimation lens, the plus lens are arranged between the light source and the particular optical element, described for converging
The light beam of light source transmitting；The collimation lens is arranged between the particular optical element and the pattern maker, for standard
The light beam of straight the light splitting surface reflection or transmission.
4. the laser projection module according to claim 3 adaptively adjusted, it is characterised in that the particular optical element
It is arranged on the focal position of the plus lens.
5. the laser projection module according to claim 2 adaptively adjusted, it is characterised in that the lens include micro-
Lens array.
6. the laser projection module according to claim 1 adaptively adjusted, it is characterised in that the light splitting surface is flat
One kind in face, convex surface or concave surface.
7. the laser projection module according to claim 1 adaptively adjusted, it is characterised in that the light source is edge emitting
Laser or vertical cavity surface emitting laser；Or be made up of multiple edge-emitting lasers or vertical cavity surface emitting laser
Array.
8. the laser projection module according to claim 1 adaptively adjusted, it is characterised in that the pattern maker connects
The ratio between beam intensity that the light beam of receipts is received with the beam detector is more than 1.
9. the laser projection module according to claim 1 adaptively adjusted, it is characterised in that also including light source control
Device, the light source controller receives the beam detector and detects intensity information, and predetermined threshold value performs following operate：
When the luminous intensity exceedes default threshold value, reduce the power of the light source or close the light source；
When the luminous intensity is less than default threshold value, increase the power of the light source.
10. a kind of depth camera, it is characterised in that the depth camera includes：
The laser projection module of adaptive adjustment as described in claim 1-9 is any, for the projective structure into object space
Change light beam image；
Image collecting device, for gathering the structured light beam images in object space；
Processor, receives the structured light beam images gathered by described image harvester, and according to the structured bundle of light beams figure
Depth image as generating the object space；
The depth image that the object space is generated according to the structured light beam images, refers to utilizing matching algorithm meter
The deviation value between the structured light beam images and reference beam image is calculated, the depth map is calculated according to the deviation value
Picture.
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| CN201710413870.5A CN107167996A (en) | 2017-06-05 | 2017-06-05 | The laser projection module and depth camera adaptively adjusted |
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| CN201710413870.5A CN107167996A (en) | 2017-06-05 | 2017-06-05 | The laser projection module and depth camera adaptively adjusted |
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| CN108344378A (en) * | 2018-04-04 | 2018-07-31 | Oppo广东移动通信有限公司 | The laser projection module and its detection method of damage, depth camera and electronic device |
| CN108387365A (en) * | 2018-02-27 | 2018-08-10 | 广东欧珀移动通信有限公司 | The laser projection module and its detection method of damage, depth camera and electronic device |
| CN108445701A (en) * | 2018-02-01 | 2018-08-24 | 宁波舜宇光电信息有限公司 | Detect the light beam projection device and depth camera of luminous intensity |
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