CN108646425B - Laser projecting apparatus, image acquiring device and electronic equipment - Google Patents
Laser projecting apparatus, image acquiring device and electronic equipment Download PDFInfo
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- CN108646425B CN108646425B CN201810291910.8A CN201810291910A CN108646425B CN 108646425 B CN108646425 B CN 108646425B CN 201810291910 A CN201810291910 A CN 201810291910A CN 108646425 B CN108646425 B CN 108646425B
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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
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
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Abstract
The invention discloses a kind of laser projecting apparatus, image acquiring device and electronic equipments.Laser projecting apparatus includes light source, collimator assembly and diffraction component.Light source is for emitting initial laser.Light source includes edge-emitting laser, and edge-emitting laser includes the light-emitting surface towards collimating element.Collimator assembly includes at least two collimating elements and at least two reflecting elements, two collimating elements and two reflecting elements are surrounded by optical transport chamber, collimating element is vertical with the optical axis of laser projecting apparatus, and collimator assembly is for extending initial laser to form multi beam expanded laser light and for collimating expanded laser light.Diffraction component is for diffraction expanded laser light to form laser pattern.Laser projecting apparatus, image acquiring device and the electronic equipment of embodiment of the present invention emit laser using the simple edge-emitting laser of manufacturing process, and with the collimator assembly of the light beam of expansible laser by laser beam expanding at multi beam expanded laser light, the small laser pattern of correlation can be so projected, the acquisition of depth image is conducive to.
Description
Technical field
The present invention relates to 3 dimension imaging technology field, in particular to a kind of laser projecting apparatus, image acquiring device and electronics
Equipment.
Background technique
When laser projecting apparatus projects laser, usually require that the laser pattern projected has biggish irrelevance, not phase
The biggish laser pattern of closing property helps to promote the acquisition precision of depth image.But current laser projecting apparatus is usually using light source
In vertical cavity surface emitting laser (the Vertical Cavity Surface Emitting of irregular lattice arrangement
Laser, VCSEL) laser pattern of correlation smaller (that is, irrelevance is larger) is projected as light source.But this kind of vertical cavity
The manufacture craft of surface-emitting laser is more complex, high production cost, and production efficiency is low.
Summary of the invention
The embodiment provides a kind of laser projecting apparatus, image acquiring device and electronic equipments.
The laser projecting apparatus of embodiment of the present invention includes light source, collimator assembly and diffraction component.The light source is for sending out
Penetrate initial laser.The light source includes edge-emitting laser, and the edge-emitting laser includes light-emitting surface, the light-emitting surface direction
The collimating element.The collimator assembly includes at least two collimating elements and at least two reflecting elements, described two collimations
Element and described two reflecting elements are surrounded by optical transport chamber, and the collimating element is vertical with the optical axis of the laser projecting apparatus,
The collimator assembly is for extending the initial laser to form multi beam expanded laser light and for collimating the expanded laser light.Institute
Diffraction component is stated for expanded laser light described in diffraction to form laser pattern.
The image acquiring device of embodiment of the present invention includes above-mentioned laser projecting apparatus, image acquisition device and processor.
Described image collector is for acquiring the laser pattern projected from the laser projecting apparatus into object space.The processor is used
In the processing laser pattern to obtain depth image.
The electronic equipment of embodiment of the present invention includes shell and above-mentioned image acquiring device.Described image acquisition device
It is arranged in the shell and from shell exposure to obtain depth image.
Laser projecting apparatus, image acquiring device and the electronic equipment of embodiment of the present invention are by using edge-emitting laser
Emit laser, and uses and can be expanded into the initial laser that edge-emitting laser emits with the collimator assembly of the light beam of expanded laser light
Multi beam expanded laser light, multi beam expanded laser light form the lesser laser pattern outgoing of correlation after diffraction component diffraction.Due to side
The manufacturing process of emitting laser is relatively simple, further also simplifies the manufacturing process of laser projecting apparatus.In addition, due to making
With can be with the collimator assembly of the light beam of expanded laser light, so that the laser projecting apparatus of the edge-emitting laser using single transmitter
The lesser laser pattern of correlation can be projected, the acquisition of depth image is conducive to.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the structural schematic diagram of the electronic equipment of certain embodiments of the present invention.
Fig. 2 is the structural schematic diagram of the image acquiring device of certain embodiments of the present invention.
Fig. 3 is the structural schematic diagram of the laser projecting apparatus of certain embodiments of the present invention.
Fig. 4 is the structural schematic diagram of the collimator assembly of the laser projecting apparatus of certain embodiments of the present invention.
Fig. 5 is the partial structure diagram of the laser projecting apparatus of certain embodiments of the present invention.
Fig. 6 is the structural schematic diagram of the collimator assembly of the laser projecting apparatus of certain embodiments of the present invention.
Fig. 7 to Figure 11 is the partial structure diagram of the laser projecting apparatus of certain embodiments of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more feature.In description of the invention
In, the meaning of " plurality " is two or more, unless otherwise specifically defined.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected or can be in communication with each other；It can be directly connected, it can also be by between intermediary
It connects connected, can be the connection inside two elements or the interaction relationship of two elements.For the ordinary skill of this field
For personnel, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
Following disclosure provides many different embodiments or example is used to realize different structure of the invention.In order to
Simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.Certainly, they are merely examples, and
And it is not intended to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or reference letter,
This repetition is for purposes of simplicity and clarity, itself not indicate between discussed various embodiments and/or setting
Relationship.In addition, the present invention provides various specific techniques and material example, but those of ordinary skill in the art can be with
Recognize the application of other techniques and/or the use of other materials.
Also referring to Fig. 1 and Fig. 2, the present invention provides a kind of electronic equipment 3000.Electronic equipment 3000 can be intelligence
Mobile phone, Intelligent bracelet, smartwatch, tablet computer, intelligent glasses, intelligent helmet, somatic sensation television game equipment etc..Electronic equipment 3000
Including shell 2000 and image acquiring device 1000.The setting of image acquiring device 1000 is in shell 2000 and sudden and violent from shell 2000
Dew is to obtain depth image.Image acquiring device 1000 includes laser projecting apparatus 100, image acquisition device 200 and processor 300.
Laser projecting apparatus 100 is used to project laser pattern 42 into object space (shown in Fig. 5).Image acquisition device 200 is sharp for acquiring
The laser pattern 42 that light projector 100 is projected into object space.Processor 300 is for obtaining laser pattern 42 to obtain depth
Image.
Specifically, laser projecting apparatus 100 projects laser pattern 42 into object space by projecting window 901, and image is adopted
Storage 200 is acquired by acquisition window 902 by the modulated laser pattern 42 of target object.Image acquisition device 200 can be infrared
Camera, processor 300 using image matching algorithm calculate in the laser pattern 42 each pixel with it is corresponding in reference pattern
The deviation value of each pixel further obtains the depth image of the laser pattern 42 further according to deviation value.Wherein, images match
Algorithm can be related (Digital Image Correlation, the DIC) algorithm of digital picture.It is of course also possible to use other figures
As matching algorithm replaces DIC algorithm.
As shown in Figure 3 and Figure 4, laser projecting apparatus 100 includes board unit 60 and lens barrel 50.Board unit 60 includes substrate
62 circuit board 61 with setting on the substrate 62.Circuit board 61 can be hardboard, soft board or Rigid Flex.Lens barrel 50 includes side
Wall 51 and the plummer 52 extended from side wall 51.The setting of side wall 51 surrounds accommodating chamber 53 on circuit board 61, and with circuit board 61.
Laser projecting apparatus 100 further includes light source 10, collimator assembly 20 and diffraction component 30.Light source 10,20 and of collimator assembly
Diffraction component 30 is housed in accommodating chamber 53, and collimator assembly 20 and diffraction component 30 are successively arranged along the luminous optical path of light source 10
Column.Specifically, circuit board 61 offers via hole 611, and light source 10 is carried on the substrate 62 and is housed in via hole 611, light source 10
For emitting initial laser.Collimator assembly 20 includes at least two collimating elements 210 and at least two reflecting elements 240.Two
Collimating element 210 and two reflecting elements 240 are surrounded by optical transport chamber 250.The light of collimating element 210 and laser projecting apparatus 100
Axis is vertical.Collimator assembly 20 forms multi beam expanded laser light for extending initial laser, and for collimating above-mentioned multi beam extension
Laser.Diffraction component 30 includes the first diffraction element 31 and the second diffraction element 32.Every beam expanded laser light successively passes through when being emitted
Cross the first diffraction element 31 and the second diffraction element 32.Multi beam expanded laser light forms laser pattern after 30 diffraction of diffraction component,
The energy of zero order beam 41 (shown in Fig. 5) is less than preset energy in laser pattern.
Wherein, light source 10 can be edge-emitting laser (edge-emitting laser, EEL), and specifically, light source 10 can
For distributed feedback laser (Distributed Feedback Laser, DFB).At this point, 11 direction of light-emitting surface of light source 10
Collimator assembly 20.The temperature drift of distributed feedback laser is smaller, and is single-point light emitting structure, is not necessarily to array of designs structure, production
Simply, cost is relatively low for laser projecting apparatus 100.
Collimator assembly 20 includes two the first collimating elements 220 being parallel to each other and the second collimating element 230 and two
The first reflecting element 241 and the second reflecting element 242 being parallel to each other.The both ends of first collimating element 220 are anti-with first respectively
Penetrate element 241 and the second reflecting element 242 connect, the both ends of the second collimating element 230 respectively with the first reflecting element 241 and
Two reflecting elements 242 connect to form optical transport chamber 250.Wherein, two reflecting elements 240 are relative to laser projecting apparatus 100
Inclined light shaft setting.In other words, the sectional view of collimator assembly 20 is parallelogram.First collimating element 220 includes one the
One light-transmission substrate 221 and at least one first lens 222, the first light-transmission substrate 221 include that the first incidence surface 223 and first goes out light
Face 224.When the number of the first lens 222 is one, the first lens 222 are arranged in the first incidence surface 223 or the first light-emitting surface
On 224；When the number of the first lens 222 is two, two the first lens 222 are separately positioned on the first incidence surface 223 and the
On one light-emitting surface 224.Second collimating element 230 includes second light-transmission substrate 231 and at least one second lens 232, the
Two light-transmission substrates 231 include the second incidence surface 233 and the second light-emitting surface 234.When the number of the second lens 232 is one, the
Two lens 232 are arranged on the second incidence surface 233 or the second light-emitting surface 234；When the number of the second lens 232 is two, two
A second lens 232 are separately positioned on the second incidence surface 233 and the second light-emitting surface 234.First reflecting element 241 and second is anti-
It penetrates the opposite two sides of element 242 and is coated with high reflection material.
It is appreciated that being based on multiple-beam interference principle, the light beam issued from any point on light source 10 is incident on high anti-
After penetrating in rate plane, light repeatedly round-trip reflection between two high reflectance planes is finally constituted the parallel transmitted light of multi beam and goes out
It penetrates.The edge-emitting laser of embodiment of the present invention is the light source 10 that single-point shines.Edge-emitting laser transmitting is a branch of initial sharp
Light, initial laser are incident in optical transport chamber 250 via the first collimating element 220, and anti-in the first reflecting element 241 and second
Repeatedly round-trip reflection between two high reflectance planes of the composition of element 242 is penetrated, to expand multi beam expanded laser light, multi beam extension
Laser is parallel to each other and is emitted through the second collimating element 230.In this way, a branch of initial laser that point light source of single emits is expanded
Beam, forms the expanded laser light of multi beam, and multi beam expanded laser light can form laser pattern outgoing after diffraction component.Wherein, first thoroughly
Mirror 222 and the second lens 232 are convex lens, and the first lens 222 and the second lens 232 are that the effect of convex lens is to increase to swash
The power of light.
Compared with using vertical cavity surface emitting laser of the point light source in irregular lattice arrangement, vertical-cavity surface-emitting swashs
Light device will not only carry out the design of the irregular alignment of point light source, and to the required precision of the distance between adjacent point light source compared with
Height, manufacturing process are complex, it is difficult to volume production.And the light source 10 that the laser projecting apparatus 100 of present embodiment uses is single-point hair
The edge-emitting laser penetrated, manufacturing process is simple, and temperature drift is smaller, and cost is relatively low.And the laser projection of embodiment of the present invention
Collimator assembly 20 in device 100 can carry out beam spread to the edge-emitting laser of single transmitter, form the parallel expansion of multi beam
Laser emitting is opened up, can satisfy the small requirement of the correlation of laser pattern.
Normally, be limited to the manufacturing process of diffraction element, diffraction element can not the whole that emits of diffraction light sources 10 swash
Light, some laser will not be diffracted element diffraction and be directly through diffraction element and project in object space, this part
Laser is zero order beam 41, and it is non-zero order light beam that the laser in object space is projected after being diffracted.The energy of zero order beam 41
It is usually high compared with the energy of non-zero order light beam, in this way, will affect the Luminance Distribution for projecting the laser pattern in object space 42
Uniformity.Diffraction component 30 in the laser projecting apparatus 100 of embodiment of the present invention can reduce the energy of zero order beam 41.Such as
Shown in Fig. 5, diffraction component 30 includes the first diffraction element 31 and the second diffraction element 32.First diffraction element 31 is passed through for diffraction
Expanded laser light after the collimation of collimator assembly 20 is to form first laser pattern 421 and the first zero order beam 411.Second diffraction element
32 are used for the first zero order beam of diffraction 411 to form second laser pattern 422 and the second zero order beam 412.Wherein, the first diffraction
Element 31 include the first optics effective district 311 and the first non-optical effective district 312, the first optics effective district 311 be configured as with
The cross section of the light beam of laser after the collimated collimation of component 20 is corresponding, is provided with diffraction light in the first optics effective district 311
Grid, the expanded laser light after collimated component 20 collimates form first laser pattern 421 and the first zero order beam after diffraction grating
411.Second diffraction element 32 includes the second optics effective district 321 and the second non-optical effective district 322, the second optics effective district
321 are configured as corresponding with the cross section of the first zero order beam 411, are provided with diffraction grating in the second optics effective district 321,
First zero order beam 411 forms second laser pattern 422 and the second zero order beam 412 after diffraction grating, and second is non-optical
Effective district 322 is to be not provided with the transparent part of diffraction grating, is spread out so that first laser pattern 421 passes through and will not change first
Penetrate the patterns of pattern 421.The diffraction grating of the diffraction grating of first optics effective district 311 and the second optics effective district 321
With different optical grating constructions, so that first laser pattern 421 and second laser pattern 422 have biggish irrelevance.The
One laser pattern 421 and second laser pattern 422 combine the whole laser pattern 42 for forming the projection of laser projecting apparatus 100.The
When one laser pattern 421 and second laser pattern 422 are projected in some plane vertical with the optical axis of laser projecting apparatus 100,
First laser pattern 421 and second laser pattern 422 can overlap, in this way, whole laser figure can be further increased
The irrelevance of case 42.
Compared to a diffraction element is used, the structure of twin diffractive elements can make zero order beam further be diffracted, because
This, the energy of zero order beam 41 reduces (for example, the energy of zero order beam 41 is less than preset energy after re-diffraction), in this way, swashing
The laser pattern 42 that light projector 100 is projected using twin diffractive elements has preferable brightness uniformity, can also be to avoid
To injury may be generated to the eyes of user due to the energy of zero order beam 41 is relatively strong.
Laser projecting apparatus 100 further includes protective cover 70.Protective cover 70 can be made of translucent material, such as glass, poly- first
Base methyl acrylate (Polymethyl Methacrylate, PMMA), polycarbonate (Polycarbonate, PC), polyamides are sub-
Amine (Polyimide, PI) etc..Since the translucent materials such as glass, PMMA, PC and PI all have excellent light transmission, protective cover
70 can not have to open up loophole.In this way, protective cover 70 can be while preventing diffraction component 30 from falling off, additionally it is possible to avoid spreading out
The exposed outside in lens barrel 50 of component 30 is penetrated, so that 30 water proof and dust proof of diffraction component.Certainly, in other embodiments,
Protective cover 70 can offer loophole, and loophole and the maximum optics effective district of the area of diffraction component 30 are opposite to avoid screening
Keep off the optical path of diffraction component 30.
In conclusion the laser projecting apparatus 100 of embodiment of the present invention emits laser by using edge-emitting laser, and
It is extended using that the initial laser that edge-emitting laser emits can be expanded into multi beam with the collimator assembly 20 of the light beam of expanded laser light
Laser, multi beam expanded laser light form the lesser laser pattern outgoing of correlation after 20 diffraction of diffraction component.Since edge emitting swashs
The manufacturing process of light device is relatively simple, further also simplifies the manufacturing process of laser projecting apparatus 100.In addition, due to using
It can with the collimator assembly 20 of the light beam of expanded laser light, so that the laser projecting apparatus of the edge-emitting laser using single transmitter
100 can also project the lesser laser pattern of correlation, be conducive to the acquisition of depth image.
Referring to Fig. 6, in some embodiments, collimator assembly 20 may also include third collimating element 260, third reflection
Element 243 and the 4th reflecting element 244.Along the light emission direction of light source 10, the first collimating element 220,230 and of the second collimating element
Third collimating element 260 is successively arranged, and the first collimating element 220, the second collimating element 230 and third collimating element 260 are equal
It is vertical with the optical axis of laser projecting apparatus 100.First collimating element 220 and the second collimating element 230, the first reflecting element 241 and
4th reflecting element 242 forms the first optical transport chamber 251, and third collimating element 260 and the second collimating element 230, third reflect
Element 243 and the 4th reflecting element 244 form the second optical transport chamber 252.First collimating element 220 includes a first light transmission base
Body 221 and at least one first lens 222, the first light-transmission substrate 221 include the first incidence surface 223 and the first light-emitting surface 224.When
When the number of first lens 222 is one, the first lens 222 are arranged on the first incidence surface 223 or the first light-emitting surface 224；When
When the number of first lens 222 is two, two the first lens 222 are separately positioned on the first incidence surface 223 and the first light-emitting surface
On 224.Second collimating element 230 includes second light-transmission substrate 231 and at least one second lens 232, the second light transmission base
Body 231 includes the second incidence surface 233 and the second light-emitting surface 234.When the number of the second lens 232 is one, the second lens 232
It is arranged on the second incidence surface 233 or the second light-emitting surface 234；When the number of the second lens 232 is two, two the second lens
232 are separately positioned on the second incidence surface 233 and the second light-emitting surface 234.Third collimating element 260 includes a third light transmission base
Body 261 and at least one the third lens 262.Third light-transmission substrate 261 includes third incidence surface 263 and third light-emitting surface 264.When
When the number of the third lens 262 is one, the third lens 262 are arranged on third incidence surface 263 or third light-emitting surface 264；When
When the number of the third lens 262 is two, two the third lens 262 are separately positioned on third incidence surface 263 and third light-emitting surface
On 264.First reflecting element 241 and the opposite two sides of the second reflecting element 242 are coated with high reflection material.Third reflector
Part 243 and the opposite two sides of the 4th reflecting element 244 are also coated with high reflection material.
In this way, by the way that multiple optical transport chambers 250 are arranged, so that the expanded laser light after the first optical transport chamber 251 expands passes through
It can be expanded again when crossing the second optical transport chamber 252, to form the expanded laser light of more multi beam, further improving laser pattern
Irrelevance.
Certainly, in some embodiments, laser projecting apparatus 100 can also be arranged three optical transport chambers, 250, four light and pass
Multiple optical transport chambers 250 such as defeated 250, five optical transport chambers 250 of chamber.In a specific embodiment of the present invention, in order to reduce laser
An optical transport chamber 250 is only arranged in the thickness of the projector 100.
In some embodiments, the quantity of light source 10 can be multiple, at this point, the number of the first lens 222 can be one
Or it is multiple.Wherein, when the number of the first lens 222 is multiple, the first incidence surface can be arranged in multiple first lens 222 simultaneously
It on 223, can also be arranged in simultaneously on the first light-emitting surface 224, can also be a part of first lens 222 while be arranged first
On incidence surface 223, the first lens of another part 222 are arranged on the first light-emitting surface 224 simultaneously.Second lens 232 and third are saturating
The set-up mode of mirror 262 is similar with the set-up mode of the first lens 222, and details are not described herein.It can be in this way, multiple lens are arranged
The more fully laser of covering light source 10 transmitting, to increase the power of laser.
Referring to Fig. 7, in some embodiments, diffraction component 30 includes the first diffraction element 31 and the second diffraction element
32.First diffraction element 31 is used for the expanded laser light after the collimated component 20 of diffraction collimates to form multiple diffracted beams, each
Diffracted beam includes the first zero order beam 411.Second diffraction element 32 forms corresponding every for each diffracted beam of diffraction
The laser pattern 423 of a diffracted beam and the second zero order beam 412.Specifically, the first diffraction element 31 includes that the first optics has
Imitate area 311 and the first non-optical effective district 312.First optics effective district 311 is configured as after collimating with collimated component 20
The cross section of all expanded laser lights is corresponding, and diffraction grating is provided in the first optics effective district 311 (for example, the first optics has
The diffraction grating imitated in area 311 can be Darman raster), the laser after collimated component 20 collimation forms multiple after diffraction grating
Diffracted beam, each diffracted beam are the opposite arrow beam of light of approximate collimation, and each diffracted beam has approximately uniform energy.
Second diffraction element 32 includes the second optics effective district 321 and the second non-optical effective district 322, wherein the second optics effective district
321 are configured as corresponding with the cross section of each diffracted beam, are provided with diffraction grating in the second optics effective district 321, spread out
Irradiating light beam forms the outgoing of laser pattern 423 after the diffraction grating diffraction in corresponding second optics effective district 321.Wherein, more
The structure of diffraction grating in a second optics effective district 321 is different.In this way, multiple diffracted beams can be with after diffraction
Multiple laser patterns 423 are formed to be emitted.It can be lucky overlapping margins between laser pattern 423 two-by-two or overlap,
Multiple laser patterns 423 are combined into the laser pattern 42 of an entirety, and the laser pattern 42 of the entirety is laser projecting apparatus 100
The laser pattern 42 projected.There is great irrelevance between multiple laser patterns 42, can further promote entirety
The irrelevance of laser pattern 42.
Compared with single diffraction element is arranged, the laser projecting apparatus 100 of embodiment of the present invention uses twin diffractive elements structure,
Zero order beam 41 is divided for lesser first zero order beam 411 of multiple energy first with the first diffraction element 31, recycles the
Two diffraction elements 32 to it is each include the first zero order beam 411 diffracted beam carry out diffraction, it is smaller further to obtain energy
The second zero order beam 412.In this way, laser projecting apparatus 100 is allowed to project the preferable laser pattern 42 of brightness uniformity.
Referring to Fig. 8, in some embodiments, diffraction component 30 includes the first diffraction element 31 and the second diffraction element
32.First diffraction element 31 is for the expanded laser light after the collimated collimation of component 20 of diffraction to form laser pattern 42 and zero order light
Beam 41, the second diffraction element 32 is for stopping zero order beam 41 to be emitted.Specifically, the first diffraction element 31 includes that the first optics has
Area 311 and the first non-optical effective district 312 are imitated, the first optics effective district 311 is configured as after collimating with collimated component 20
The cross section of all expanded laser lights is corresponding, and diffraction grating is provided in the first optics effective district 311, and collimated component 20 collimates
Laser afterwards forms laser pattern 42 and zero order beam 41 after diffraction grating.Second diffraction element 32 includes that the second optics is effective
Area 321 and the second non-optical effective district 322.Second optics effective district 321 be configured as it is corresponding with the cross section of zero order beam,
321 are equipped with notch filter in second optics effective district, and specifically, notch filter can hinder interference light filter for narrowband, utilize
Narrowband hinders the angle selective properties of interference light filter, filters out to demarcate the laser of incident angles, and makes except calibration is incident
The laser emitting of incident angles except angle, the second non-optical effective district 322 are to be not provided with the transparent part of diffraction grating,
So that laser pattern 42 passes through and will not change the patterns of laser pattern 42.
Compared with single diffraction element is arranged, the laser projecting apparatus 100 of embodiment of the present invention uses twin diffractive elements structure,
Expanded laser light after collimating first with the collimated component 20 of 31 diffraction of the first diffraction element forms laser pattern 42 and zero order light
Beam 41 recycles the notch filter in the second diffraction element 32 that zero order beam 41 is stopped to be emitted, to avoid zero order beam 41
The excessively high brightness uniformity to laser pattern 42 of energy influence.
Fig. 3 and Fig. 9 are please referred to, in some embodiments, laser projecting apparatus 100 further includes fixing piece.Specifically, light source
10 are in the form of a column, and an end face of the light source 10 far from substrate 62 forms light-emitting surface 11.Laser is issued from light-emitting surface 11,11 court of light-emitting surface
To collimator assembly 20.Light source 10 is fixed on the substrate 62.Fixing piece can be sealing 15, and light source 10 is bonded in substrate by sealing 15
On 62, for example, the one side bonding opposite with light-emitting surface 11 of light source 10 is on the substrate 62.Incorporated by reference to Fig. 3 and Figure 10, light source 10
Side 12 can also be bonded on the substrate 62, and sealing 15 wraps the side 12 of surrounding, can also only be bonded side 12 some
Face and substrate 62 or certain be bonded several face and substrate 62.Sealing at this time 15 can be heat-conducting glue, the heat that the work of light source 10 is generated
Amount conduction is into substrate 62.Since edge-emitting laser is usually in fine strip shape, when the light-emitting surface 11 of edge-emitting laser is towards standard
When straight component 20, edge-emitting laser is placed vertically, and edge-emitting laser, which is easy to appear, at this time the meaning such as falls, shifts or shake
Outside, thus by be arranged sealing 15 edge-emitting laser can be fixed, prevent edge-emitting laser transmitting fall, shift or
Shaking etc. is unexpected.
Also referring to Fig. 3 and Figure 11, in some embodiments, fixing piece can be also the support frame 16 of elasticity.Support
The number of frame 16 is two or more.Accommodating space 161 is collectively formed in multiple support frames 16.Accommodating space 161 is for receiving
Facial expression source 10, multiple support frames 16 support light source 10, in this way, can prevent light source 10 from shaking.
Further, as shown in figure 3, substrate 62 offers heat release hole 621.Can be filled in heat release hole 621 heat-conducting glue with
For the heat dissipation of light source 10.
In addition, in some embodiments, substrate 62 can be omitted, light source 10 is directly carried on circuit board 61.In this way,
It can reduce the thickness of laser projecting apparatus 100.
Laser projecting apparatus 100, image acquiring device 1000 and the electronic equipment 3000 of embodiment of the present invention by using
Edge-emitting laser emits laser, and using can be emitted edge-emitting laser with the collimator assembly 20 of the light beam of expanded laser light
Initial laser expands into multi beam expanded laser light, and multi beam expanded laser light forms the lesser laser of correlation after 20 diffraction of diffraction component
Pattern outgoing.Since the manufacturing process of edge-emitting laser is relatively simple, the system of laser projecting apparatus 100 is further also simplified
Make technique.In addition, can be with the collimator assembly 20 of the light beam of expanded laser light, so that using the edge emitting of single transmitter due to having used
The laser projecting apparatus 100 of laser can also project the lesser laser pattern of correlation, be conducive to the acquisition of depth image.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
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, modifies, replacement and variant.
Claims (10)
1. a kind of laser projecting apparatus, which is characterized in that the laser projecting apparatus includes:
Light source, the light source is for emitting initial laser；
Collimator assembly, the collimator assembly include at least two collimating elements and at least two reflecting elements, described two collimations
Element and described two reflecting elements are surrounded by optical transport chamber, and the collimating element is vertical with the optical axis of the laser projecting apparatus,
Two reflecting elements are parallel to each other and are arranged relative to the inclined light shaft of the laser projecting apparatus, and the collimator assembly is used for
The initial laser is extended to form multi beam expanded laser light and for collimating the expanded laser light, the light source includes edge emitting
Laser, the edge-emitting laser include light-emitting surface, and the light-emitting surface is towards the collimating element；With
Diffraction component, the diffraction component is for expanded laser light described in diffraction to form laser pattern.
2. laser projecting apparatus according to claim 1, which is characterized in that two collimating elements are parallel to each other, and two
The both ends of the collimating element connect respectively with two reflecting elements to form the optical transport chamber.
3. laser projecting apparatus according to claim 2, which is characterized in that each collimating element include light-transmission substrate and
At least one lens, the light-transmission substrate include opposite incidence surface and light-emitting surface, on the incidence surface and/or the light-emitting surface
It is provided at least one described lens.
4. laser projecting apparatus according to claim 1, which is characterized in that the diffraction component include the first diffraction element and
Second diffraction element, the expanded laser light successively pass through first diffraction element and second diffraction element.
5. laser projecting apparatus according to claim 1, which is characterized in that the laser projecting apparatus further include board unit and
Lens barrel, the board unit include the circuit board of substrate and setting on the substrate, and the lens barrel is arranged in the circuit board
Accommodating chamber above and with the circuit board is surrounded, the collimator assembly, the diffraction component are housed in the accommodating chamber, and edge
The luminous optical path of the light source is set gradually, and the side wall of the lens barrel is extended with plummer to the center of the accommodating chamber, described
Diffraction component is arranged on the plummer.
6. laser projecting apparatus according to claim 5, which is characterized in that the laser projecting apparatus further includes fixing piece, institute
Fixing piece is stated for the edge-emitting laser to be fixed on the board unit.
7. laser projecting apparatus according to claim 6, which is characterized in that the fixing piece includes sealing, and the sealing is set
It sets between the edge-emitting laser and the board unit, the sealing is heat-conducting glue.
8. laser projecting apparatus according to claim 6, which is characterized in that the fixing piece includes being arranged in the substrate in batch
Accommodating space is collectively formed in the support frame of at least two elasticity on part, at least two support frames as described above, and the accommodating space is used
In accommodating the light source, two support frames as described above are used to support said light source.
9. a kind of image acquiring device, which is characterized in that described image acquisition device includes:
Laser projecting apparatus described in claim 1 to 8 any one；
Image acquisition device, described image collector is for acquiring the laser figure projected from the laser projecting apparatus into object space
Case；With
Processor, the processor is for handling the laser pattern to obtain depth image.
10. a kind of electronic equipment, which is characterized in that the electronic equipment includes:
Shell；With
Image acquiring device as claimed in claim 9, described image acquisition device are arranged in the shell and from the shells
Exposure is to obtain depth image.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810291910.8A CN108646425B (en) | 2018-04-03 | 2018-04-03 | Laser projecting apparatus, image acquiring device and electronic equipment |
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| CN201810291910.8A CN108646425B (en) | 2018-04-03 | 2018-04-03 | Laser projecting apparatus, image acquiring device and electronic equipment |
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| CN108646425B true CN108646425B (en) | 2019-08-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2022514050A (en) * | 2018-12-17 | 2022-02-09 | ブリスライツ，リミティド ライアビリティ カンパニー | Dual light source illuminator with laser housing and laser |
| CN112066907B (en) * | 2019-06-11 | 2022-12-23 | 深圳市光鉴科技有限公司 | Depth imaging device |
| CN110456323A (en) * | 2019-07-09 | 2019-11-15 | 深圳奥比中光科技有限公司 | A kind of light emitting unit, light emitting devices and distance-measuring equipment |
| CN114500808A (en) * | 2019-08-14 | 2022-05-13 | Oppo广东移动通信有限公司 | Laser projector, depth camera and electronic device |
| CN115135957B (en) * | 2020-02-25 | 2023-10-24 | 华为技术有限公司 | Depth estimation system for electronic devices |
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| CN108646425A (en) | 2018-10-12 |
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