CN108490595A - Project structured light module, image acquiring device and electronic equipment - Google Patents
Project structured light module, image acquiring device and electronic equipment Download PDFInfo
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- CN108490595A CN108490595A CN201810200857.6A CN201810200857A CN108490595A CN 108490595 A CN108490595 A CN 108490595A CN 201810200857 A CN201810200857 A CN 201810200857A CN 108490595 A CN108490595 A CN 108490595A
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- laser
- reflecting
- laser generator
- structured light
- light module
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0856—Catadioptric systems comprising a refractive element with a reflective surface, the reflection taking place inside the element, e.g. Mangin mirrors
- G02B17/086—Catadioptric systems comprising a refractive element with a reflective surface, the reflection taking place inside the element, e.g. Mangin mirrors wherein the system is made of a single block of optical material, e.g. solid catadioptric systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/04—Catoptric systems, e.g. image erecting and reversing system using prisms only
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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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- Semiconductor Lasers (AREA)
Abstract
The invention discloses a kind of project structured light module, image acquiring device, electronic equipments.Project structured light module includes first laser generator, second laser generator and reflecting element.First laser generator is for emitting first laser；Second laser generator is oppositely arranged with first laser generator, and second laser generator is for emitting second laser.First laser generator and second laser generator are separately positioned on the opposite both sides of reflecting element, and reflecting element for reflecting first laser and second laser in the same direction.In the project structured light module of the present invention, image acquiring device and electronic equipment, the first laser of first laser generator transmitting and the second laser of second laser generator transmitting converge after reflecting element reflects respectively, the irrelevance for converging laser-formed laser pattern is higher than the irrelevance for forming laser pattern by single laser generator, so to improve the measurement accuracy of project structured light module.
Description
Technical field
The present invention relates to optics and electronic technology fields, more specifically, are related to a kind of project structured light module, image obtains
Take device and electronic equipment.
Background technology
In the prior art, image acquiring device usually utilizes project structured light module to project laser pattern to target object,
Then it is acquired by the modulated laser pattern of target object using image acquisition device to obtain the depth image of target object, laser
The height of the irrelevance of pattern directly affects the height of its depth image precision and obtains the speed of depth image speed, and
When laser light source is molded, the irrelevance of corresponding laser pattern also determines, therefore cannot be by changing laser pattern
Irrelevance improves the measurement accuracy of project structured light module.
Invention content
A kind of project structured light module of embodiment of the present invention offer, image acquiring device and electronic equipment.
Embodiment of the present invention project structured light module includes：
First laser generator, the first laser generator is for emitting first laser；
The second laser generator being oppositely arranged with the first laser generator, the second laser generator is for sending out
Penetrate second laser；And
Reflecting element, the first laser generator and the second laser generator are separately positioned on the reflecting element
Opposite both sides, the reflecting element for reflecting the first laser and the second laser in the same direction.
In some embodiments, the reflecting element is prism, and the reflecting element includes two and is located at the prism
Internal and intersection the first reflecting part and the second reflecting part, the reflecting surface of first reflecting part and the first laser generator
Relatively to reflect the first laser, the reflecting surface of second reflecting part and the second laser generator are opposite to reflect
State second laser.
In some embodiments, the reflecting element is prism, and the reflecting element includes two and is located at the prism
First reflecting surface and the second reflecting surface in outside, first reflecting surface and the first laser generator are opposite with described in reflection
First laser, second reflecting surface are opposite with the second laser generator to reflect the second laser.
In some embodiments, the reflecting element includes the first prism and the second prism, and first prism includes
First reflecting surface, second prism include the second reflecting surface, and first reflecting surface is opposite with the first laser generator
To reflect the first laser, second reflecting surface is opposite with the second laser generator to reflect the second laser.
In some embodiments, the first laser generator and the second laser generator are edge emitting laser
Device, the first laser generator include the first light-emitting surface, the second laser generator include the second light-emitting surface, described first
The surface of emission and second surface of emission are towards the reflecting element.
In some embodiments, the first laser generator and the second laser generator are vertical cavity surface hair
Penetrate laser.
In some embodiments, the light intensity of the first laser is different from the light intensity of the second laser.
In some embodiments, the laser pattern of the first laser is different from the laser pattern of the second laser.
In some embodiments, the project structured light module further includes board unit and lens barrel, the lens barrel setting
Host cavity is collectively formed on the board unit and with the board unit, the first laser generator, described second swash
Optical generator and the reflecting element are arranged on the board unit and are housed in the host cavity.
In some embodiments, the project structured light module further include the collimating element being arranged in the lens barrel and
The convergence that diffraction optical element, the first laser and the second laser are formed after being converged after reflecting element reflection swashs
Light, the convergence laser pass through the collimating element and the diffraction optical element successively.
The image acquiring device of embodiment of the present invention includes：
Project structured light module described in above-mentioned any one embodiment；
Image acquisition device, described image collector is for acquiring the laser pattern projected by the project structured light module；
And
The processor being connect respectively with the project structured light module and described image collector, the processor is for locating
The laser pattern is managed to obtain depth image.
The electronic equipment of embodiment of the present invention includes：
Shell；And
Image acquiring device described in the above embodiment, described image acquisition device are arranged in the shell and from institutes
Shell exposure is stated to obtain depth image.
In the project structured light module of embodiment of the present invention, image acquiring device and electronic equipment, first laser occurs
The first laser of device transmitting and the second laser of second laser generator transmitting converge after reflecting element reflects respectively, and convergence swashs
The irrelevance for the laser pattern that light is formed is higher than the irrelevance for forming laser pattern by single laser generator, so to carry
The measurement accuracy of high project structured light module.
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 equipment of embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the image acquiring device of embodiment of the present invention；
Fig. 3 is the diagrammatic cross-section of the project structured light module of embodiment of the present invention；
Fig. 4 to Fig. 7 is the light source optical path schematic diagram of embodiment of the present invention；
Fig. 8 is the diagrammatic cross-section of the project structured light module of embodiment of the present invention；
Fig. 9 to Figure 10 is the part-structure schematic diagram of the project structured light module of embodiment of the present invention.
Main element and symbol description：
Electronic equipment 1000, shell 200, image acquiring device 100, project structured light module 10, board unit 11, substrate
111, heat emission hole 1111, circuit board 112, via 113, lens barrel 12, host cavity 121, lens barrel side wall 122, lens barrel top 123, mirror
Cylinder bottom 124, annular plummer 125, light hole 126, light source 13, first laser generator 131, the first light-emitting surface 1311, the
Two faying faces 1312, second laser generator 132, the second light-emitting surface 1321, the second faying face 1322, edge-emitting laser 133,
Vertical cavity surface emitting laser 134, the surface of emission 1341, mounting surface 1342, joint face 1343, reflecting element 14, the first reflecting part
141, the second reflecting part 142, the first reflecting surface 143, the second reflecting surface 144, the first prism 145, the second prism 146, collimation member
Part 15, optical section 151, engaging portion 152, diffraction optical element 16, the first face 161, the second face 162, connector 17, protective cover
18, loophole 181, fixing piece 19, sealing 191, supporting rack 192, receiving space 193, first laser a, second laser b, convergence
Laser c, image acquisition device 20, processor 30, projection window 40, acquisition window 50.
Specific implementation mode
Embodiments of the present invention are described further below in conjunction with attached drawing.Same or similar label is from beginning in attached drawing
To the same or similar element of expression or element with the same or similar functions eventually.
In addition, the embodiments of the present invention described below in conjunction with the accompanying drawings are exemplary, it is only used for explaining the present invention's
Embodiment, and be not considered as limiting the invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
Referring to Fig. 1, the electronic equipment 1000 of embodiment of the present invention includes shell 200 and image acquiring device 100.Electricity
Sub- equipment 1000 can be mobile phone, tablet computer, laptop computer, game machine, head aobvious equipment, access control system, automatic teller machine etc., this hair
Bright embodiment is illustrated so that electronic equipment 1000 is mobile phone as an example, it will be understood that the concrete form of electronic equipment 1000 can be with
It is other, this is not restricted.The setting of image acquiring device 100 exposes in shell 200 and from shell 200 to obtain depth map
Picture, shell 200 can provide the protections such as dust-proof, waterproof, shatter-resistant to image acquiring device 100, be offered on shell 200 and image
100 corresponding hole of acquisition device, so that light is pierced by from hole or penetrates shell 200.
Referring to Fig. 2, image acquiring device 100 includes project structured light module 10, image acquisition device 20 and processor 30.
It could be formed with projection window 40 corresponding with project structured light module 10, and and image acquisition device on image acquiring device 100
20 corresponding acquisition windows 50.Project structured light module 10 is used to project laser pattern to object space by projecting window 40,
Image acquisition device 20 is used to acquire by the modulated laser pattern of mesh subject matter by acquisition window 50.In one example, it ties
The laser that structure light projection module 10 projects is infrared light, and image acquisition device 20 is infrared camera.Processor 30 is thrown with structure light
It penetrates module 10 and image acquisition device 20 is all connected with, processor 30 is for handling laser pattern to obtain depth image.Specifically, locate
Reason device 30 calculates each pixel corresponding with reference pattern of each pixel in the laser pattern using image matching algorithm
Deviation value, the depth image of the laser pattern is further obtained further according to the deviation value.Wherein, image matching algorithm can be number
Related (Digital Image Correlation, the DIC) algorithm of word image.It is of course also possible to use other image matching algorithms
Instead of DIC algorithms.The structure of project structured light module 10 will be described further below.
Referring to Fig. 3, project structured light module 10 includes board unit 11, lens barrel 12, light source 13, reflecting element 14, standard
Straight element 15 and diffraction optical element 16.The laser optical path that reflecting element 14 emits for changing light source 13, specifically, light source
The laser of 13 transmittings passes through collimating element 15 and diffraction optical element 16 successively after the reflection of reflecting element 14.
Board unit 11 includes substrate 111 and the circuit board 112 being carried on substrate 111.Substrate 111 is for carrying lens barrel
12, light source 13 and circuit board 112.The material of substrate 111 can be plastics, for example poly terephthalic acid may be used in substrate 111
Glycol ester (Polyethylene Glycol Terephthalate, PET), polymethyl methacrylate (Polymethyl
Methacrylate, PMMA), it is makrolon (Polycarbonate, PC), any one in polyimides (Polyimide, PI)
The unitary plastic material of kind is made.In this way, 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 project structured light module 10 can be connected to Fig. 1 by connector 17
On the mainboard of electronic equipment 1000 in embodiment.In order to improve radiating efficiency, heat emission hole can also be offered on substrate 111
1111, light source 13 or circuit board 112 work generate heat can be shed by heat emission hole 1111, can also be filled out in heat emission hole 1111
Heat-conducting glue is filled, to further increase the heat dissipation performance of board unit 11.
Lens barrel 12 is arranged on board unit 11 and host cavity 121 is collectively formed with board unit 11.Specifically, lens barrel 12
It can be connect with the circuit board 112 of board unit 11, lens barrel 12 can be bonded by viscose glue with circuit board 112, to improve receiving
The air-tightness of chamber 121.Certainly, lens barrel 12 and the specific connection type of board unit 11 can have other, such as be connected by engaging
It connects.Host cavity 121 can be used for accommodating components, the host cavities 121 such as collimating element 15, diffraction optical element 16 and be formed simultaneously knot
A part for the light path of structure light projection module 10.In embodiments of the present invention, lens barrel 12 is in hollow tubular, and lens barrel 12 includes mirror
Cylinder side wall 122 and opposite lens barrel top 123 and lens barrel bottom 124.
Lens barrel side wall 122 surrounds host cavity 121.Wherein, one of host cavity 121 is opened on 123 at the top of lens barrel
Another is opened on lens barrel bottom 124.Lens barrel bottom 124 is combined with board unit 11, such as glued.
Lens barrel 12 further includes annular plummer 125.123 and lens barrel bottom 124 are arranged at the top of lens barrel in annular plummer 125
Between.Annular plummer 125 extends from the inner peripheral of lens barrel side wall 122 to host cavity 121.Annular plummer 125 is formed and is received
The light hole 126 that vessel 121 is connected to.
Light source 13 is arranged on board unit 11 and is housed in host cavity 121, and specifically, light source 13 can be arranged in electricity
It being electrically connected on road plate 112 and with circuit board 112, light source 13 can also be arranged on substrate 111 and be housed in via 113, this
When, it can be by arranging that light source 13 is electrically connected by conducting wire with circuit board 112.For light source 13 for emitting laser, laser can be red
Outer laser.Light source 13 includes first laser generator 131 and second laser generator 132.
First laser generator 131 is for emitting first laser a.First laser generator 131 is carried on board unit 11
On.Specifically, the direction that first laser generator 131 emits is that the periphery of board unit 11 is directed toward the center of board unit 11.
Second laser generator 132 is for emitting second laser b.Second laser generator 132 is carried on board unit 11
On, and be oppositely arranged with first laser generator 131.Specifically, second laser generator 132 emits the direction of second laser b
The center of board unit 11 is directed toward for the periphery of board unit 11.Wherein, first laser a is opposite with the direction of second laser b.This
In the opposite direction that can be understood as first laser a and second laser b on the contrary, it can be appreciated that first laser a and second
Laser b shapes form an angle, such as any one angle (being free of 0 ° and 180 °) between 0 ° to 180 °.
Reflecting element 14 is arranged on board unit 11 and is housed in host cavity 121, specifically, first laser generator
131 and second laser generator 132 be separately positioned on the opposite both sides of reflecting element 14, in other words, reflecting element 14 is arranged
Between first laser generator 131 and second laser generator 132.Reflecting element 14 is towards light hole 126, and reflecting element
One or more layers material being capable of reflecting light, such as metal (silver, aluminium, tin), alloy or metal compound film are provided on 14
Equal materials.Reflecting element 14 for reflecting first laser a and second laser b in the same direction.Specifically, first laser generator
131 emit first laser a towards reflecting element 14, and second laser generator 132 emits second laser b towards reflecting element 14.First
Laser a passes through the reflective surface of reflecting element 14, and second laser b is reflected by reflecting element 14, and the two converges to form remittance
Poly- laser c, convergence laser c are emitted in the same direction.Wherein, convergence laser c is after first laser a reflects and second laser b is anti-
Laser superposition after penetrating.It includes convergence laser c to converge the laser pattern that laser c is formed to have higher uniqueness, the uniqueness
The uniqueness of shape, size, the arrangement position of the laser pattern of formation etc., for example, in Fig. 3 first laser a independently form swash
The uniqueness of light pattern and the second laser b laser patterns independently formed is less than the unique of the laser pattern that convergence laser c is formed
Property, therefore it is higher to converge the laser pattern irrelevance that laser c is formed.
Collimating element 15 can be optical lens, and collimating element 15 is used for the laser that collimated light source 13 emits, collimating element
15 are housed in host cavity 121, and collimating element 15 can be assembled into from lens barrel bottom 124 in lens barrel 12.Collimating element 15 includes
Optical section 151 and engaging portion 152, engaging portion 152 with lens barrel side wall 122 for being combined so that collimating element 15 is fixed on host cavity
In 121, in embodiments of the present invention, optical section 151 includes two curved surfaces positioned at 15 opposite both sides of collimating element.Engaging portion
152 contradict with annular plummer 125, and one of optical section 151 curved surface stretches into annular light hole 126.In this way, not increasing
While adding the thickness of project structured light module 10, annular plummer 125 can both carry diffraction optical element 16, can also between
Every collimating element 15 and diffraction optical element 16.
Laser projection after diffraction optical element 16 can collimate collimated element 15 goes out laser pattern.Diffraction optics member
Part 16 is housed in host cavity 121 and is carried on annular plummer 125.Specifically, diffraction optical element 161 includes opposite
First face 161 and the second face 162.It is formed with diffraction structure on first face 161.First face 161 is towards collimating element 15, the first face
161 can be combined by way of glued with annular plummer 125.It converges laser c and passes through collimating element 15 and diffraction light successively
Element 16 is learned, and is projected from lens barrel 12.Laser after the collimation of collimating element 15 is formed after diffraction structure diffraction and diffraction structure
Corresponding laser pattern.Diffraction optical element 16 can be made of glass, can also be made of composite plastic (such as PET).
To sum up, the project structured light module 10, image acquiring device 100 and electronic equipment 1000 of embodiment of the present invention
In, the second laser b for first laser a and second laser generator 132 transmitting that first laser generator 131 emits is passed through instead respectively
It penetrates after element 14 reflects and converges, the irrelevance ratio of the laser pattern that convergence laser c is formed is formed sharp by single laser generator
The irrelevance of light pattern is high, so to improve the measurement accuracy of project structured light module 10.
Referring to Fig. 4, in some embodiments, reflecting element 14 is prism.Reflecting element 14 includes two and is located at rib
The first reflecting part 141 and the second reflecting part 142 of mirror inside and intersection.The reflecting surface of first reflecting part 141 is sent out with first laser
Raw device 131 is opposite to reflect first laser a, and the reflecting surface of the second reflecting part 142 is opposite with reflection with second laser generator 132
Second laser b.Specifically, reflecting element 14 can be the single prism of rule.In embodiment as shown in Figure 5, reflecting element
14 may be irregular single prism.Incorporated by reference to Fig. 3, reflecting surface of the first laser generator 131 towards the first reflecting part 141
Emit first laser a, second laser generator 132 towards second reflecting part 142 reflection surface launching second laser b, first
Laser a passes through the reflective surface of the first reflecting part 141, and second laser b passes through the reflective surface of the second reflecting part 142,
The two converges to form convergence laser c, and convergence laser c passes through collimating element 15, diffraction optical element 16 successively.
Wherein, the reflectivity of the reflecting surface of the reflectivity of the reflecting surface of the first reflecting part 141 and the second reflecting part 142 can be with
It is identical, for example, the reflectivity of the two is any one numerical value such as 50%, 80%, 90%.The reflecting surface of first reflecting part 141
Reflectivity and the reflectivity of reflecting surface of the second reflecting part 142 can also be different, for example, the reflecting surface of the first reflecting part 141
Reflectivity be any one numerical value between 50% to 70%, the reflectivity of the reflecting surface of the second reflecting part 142 be 80% to
Any one numerical value between 90%.
In addition, the first reflecting part 141 can be orthogonal with the second reflecting part 142, at this point, even if in first laser a
Heart light and the central ray of second laser b are not arranged on the same straight line, also can be by first laser a through the first reflecting part 141
Light after reflective surface is overlapped with light of the second laser b after the reflective surface of the second reflecting part 142, makes structure light
The laser pattern that projection module 10 projects more is concentrated, in this way, in the case where not increasing 13 power of light source, project structured light
Module 10 is suitable for the scene of distance objective object farther out.Certainly, the reflecting surface of the first reflecting part 141 can also be with the second reflection
At any one angle (being free of 0 ° and 180 °) between 0 ° to 180 ° between the reflecting surface in portion 142, for example, 45 °, 60 °,
120 °, 150 °, at this point, light of the first laser a after the reflective surface of the first reflecting part 141 and second laser b are through second
Light after the reflective surface of reflecting part 142 is staggered, to weaken the zero level light intensity of convergence laser.In this way, project structured light
Module 10 is suitable for the closer scene of distance objective object, such as projects laser figure to the eyes of 10 user of project structured light module
Case, the weaker laser pattern of zero level light intensity can avoid the eyes of harm users.
Referring to Fig. 6, in some embodiments, reflecting element 14 is prism.Reflecting element 14 includes two and is located at rib
The first reflecting surface 143 on the outside of mirror and the second reflecting surface 144, the first reflecting surface 143 are opposite with anti-with first laser generator 131
First laser a is penetrated, the second reflecting surface 144 is opposite with reflected second laser b with second laser generator 132.Specifically, reflector
Part 14 can be prism, and the first reflecting surface 143 and the second reflecting surface 144 are the plane intersected on prism.Incorporated by reference to Fig. 3,
First laser generator 131 emits first laser a towards the first reflecting surface 143, and second laser generator 132 is reflected towards described second
Face 144 emits second laser b.First laser a reflects to form the first reflection laser a ' by the first reflecting surface 143, and second swashs
Light b reflects to form the first reflection laser b ' by the second reflecting surface 144.First reflection laser a ' and the second reflection laser b ' is common
Form convergence laser c.It converges laser c and passes through collimating element 15, diffraction optical element 16 successively.Wherein, the first reflection laser a '
Can be overlapped with the second reflection laser b ', it can also be parallel to each other.In addition, the reflectivity of the first reflecting surface 143 can be with second
The reflectivity of reflecting surface 144 is identical, can also be different.Furthermore the first reflecting surface 143 can mutually hang down with the second reflecting surface 144
Directly to increase the zero level light intensity of convergence laser, increase detecting distance.First reflecting surface 143 can also may be used with the second reflecting surface 144
To form any one angle (being free of 0 ° and 180 °) between 0 ° to 180 ° to weaken the zero level light intensity of convergence laser, protection is used
The eyes at family.
Referring to Fig. 7, in some embodiments, reflecting element 14 includes the first prism 145 and the second prism 146.The
One prism 145 includes the first reflecting surface 143, and the second prism 146 includes the second reflecting surface 144, and the first reflecting surface 143 and first swashs
Optical generator 131 is opposite to reflect first laser a, and the second reflecting surface 144 is opposite to reflect second with second laser generator 132
Laser b.Specifically, the first prism 145 and the second prism 146 can be two prisms separated from each other, shape on the first prism 145
At there is the first reflecting surface 143, the second reflecting surface 144 is formed on the second prism 146.Incorporated by reference to Fig. 3, first laser generator
131 emit first laser a towards the first reflecting surface 143, and second laser generator 132 emits second towards second reflecting surface 144
Laser b.First laser a reflects to form the first reflection laser a ' by the first reflecting surface 143, and second laser b is anti-by second
It penetrates face 144 and reflects to form the first reflection laser b '.Convergence laser is collectively formed in first reflection laser a ' and the second reflection laser b '
c.It converges laser c and passes through collimating element 15, diffraction optical element 16 successively.Wherein, the first reflection laser a ' swashs with the second reflection
Light b ' can be overlapped, can also be parallel to each other.In addition, the first reflecting surface 143 can be orthogonal to increase with the second reflecting surface 144
The zero level light intensity of big convergence laser, increases detecting distance.First reflecting surface 143 can also be formed with the second reflecting surface 144
Any one angle (being free of 0 ° and 180 °) between 0 ° to 180 ° protects the eye of user to weaken the zero level light intensity of convergence laser
Eyeball.In other embodiments, the first prism 145 and the second prism 146 can also be the prism be combineding with each other, such as the first prism
145 and second prism 146 be arranged on prism base, 145 and second prism 146 of such first prism can be carried preferably
On board unit 11 in Fig. 3 embodiments.
Referring to Fig. 8, in some embodiments, project structured light module 10 further includes protective cover 18.Protective cover 18 with
Lens barrel 12 combines, and protective cover 18 is used for the position of diffraction-limited optical element 16, and specifically, protective cover 18 can stop diffraction light
Element 16 is learned to move along the light direction of light source 13.The setting of protective cover 18 123 at the top of the lens barrel on, the phase of diffraction optical element 16
Both sides are carried on the back to contradict with protective cover 18 and annular plummer 125 respectively.
Specifically, protective cover 18 can be pasted onto on 123 at the top of lens barrel by glue so that protective cover 18 and 12 knot of lens barrel
Close relatively reliable.Protective cover 18 and the second face 162 of diffraction optical element 16 are inconsistent, to prevent diffraction optical element 16
It falls off from light hole 126 along light direction.
In some embodiments, protective cover 18 is made of metal material, such as silver nanowire, metal silver wire, copper sheet etc..
Protective cover 18 made of metal offers loophole 181.The position of loophole 181 is corresponding with diffraction optical element 16,
Laser sequentially passes through after collimating element 15, light hole 126, diffraction optical element 16 and loophole 181 from project structured light module
It is projected in 10.In embodiments of the present invention, loophole 181 can be in the shapes such as regular polygon, circle, rectangle, ellipse, trapezoidal
Shape.The pore size of loophole 181 is less than at least one of width or length of diffraction optical element 16 with diffraction-limited light
Learn the position of element 16.In other embodiments, protective cover 18 can also be made of translucent material, such as glass, poly- methyl-prop
E pioic acid methyl ester (Polymethyl Methacrylate, PMMA), makrolon (Polycarbonate, PC), polyimides
(Polyimide, PI) etc..Since the translucent materials such as glass, PMMA, PC and PI all have excellent light transmission, protective cover 18
It can not have to open up loophole 181.
Referring to Fig. 3, in some embodiments, first laser generator 131 and second laser generator 132 are side
Emitting laser (Edge-Emitting Laser, EEL) 133.Edge-emitting laser 133 can be distributed feedback laser
(Distributed Feedback Laser, DFB).The laser of distributed feedback laser is when propagating, by optical grating construction
Feedback obtain power gain.The power for improving distributed feedback laser is needed by increasing Injection Current and/or increasing
The length for adding distributed feedback laser, due to increase Injection Current can make distributed feedback laser power consumption increase and
There is serious problem of generating heat, therefore, in order to ensure that distributed feedback laser can work normally, needs to increase distributed feed-back
The length of formula laser causes distributed feedback laser generally in elongate strip structure.
Incorporated by reference to Fig. 4, specifically, first laser generator 131 includes the first light-emitting surface 1311 and the first faying face 1312.
First light-emitting surface 1311 is an end face of the separate lens barrel side wall 122 of first laser generator 131, and the first faying face 1312 is
The end face that first laser generator 131 is combined with board unit 11.First laser a is sent out from the first light-emitting surface 1311.The
Dual-laser generator 132 includes the second light-emitting surface 1321 and the second faying face 1322.Second light-emitting surface 1321 is sent out for second laser
One end face of the separate lens barrel side wall 122 of raw device 132, the second faying face 1322 are the end combined with board unit 11
Face.First laser a is sent out from the first light-emitting surface 1311.Second laser b is sent out from the second light-emitting surface 1321.First light-emitting surface 1311
And second light-emitting surface 1321 towards reflecting element 14.Using edge-emitting laser as light source 13, on the one hand due to edge emitting
Laser is single-point light emitting structure, make it is simple, without making array structure, the cost of light source of project structured light module 10 compared with
Low, on the other hand, and the laser that edge-emitting laser 133 emits more is concentrated, without using the reflecting element that volume is larger
14 can reflect most first laser a and second laser b.
Referring to Fig. 9, in some embodiments, the light source 13 in above-mentioned Fig. 8 embodiments uses edge-emitting laser
133, can also use vertical cavity surface emitting laser (Vertical-Cavity Surface-Emitting Laser,
VCSEL) 134, i.e., first laser generator 131 and second laser generator 132 are vertical cavity surface emitting laser 134.It hangs down
Straight cavity surface-emitting laser 134 includes semiconductor substrate and is arranged VCSEL array in substrate.Specifically, vertical-cavity surface-emitting
Laser 134 includes the opposite surface of emission 1341, mounting surface 1342 and joint face 1343.The surface of emission 1341 is vertical-cavity surface-emitting
On an end face of the laser 134 far from lens barrel side wall 122.The surface of emission 1341 is towards reflecting element 14, mounting surface 1342 and base
Board group part 11 connects, and joint face 1343 is connect with the surface of emission 1341, mounting surface 1342.Vertical cavity surface emitting laser 134 is one
The new laser of kind vertical surface light extraction, is compared with traditional edge-emitting lasers, such as distributed feedback laser, is hung down
The light emission direction and substrate transverse of straight cavity surface-emitting laser 134 can relatively easily realize the integrated of high density two-dimensional array,
It realizes higher power output, and since it compared to edge-emitting lasers possesses smaller volume, is collected to easily facilitate
At in miniature electric component；The coupling efficiency of VCSEL and optical fiber is high simultaneously, without the beam shaping of complex and expensive
System, and manufacturing process is compatible with light emitting diode, greatly reduces production cost.
Also referring to Fig. 3 and Fig. 9, in some embodiments, project structured light module 10 further includes fixing piece 19, Gu
Part 19 is determined for first laser generator 131 and second laser generator 132 to be fixed on board unit 11.Work as first laser
When generator 131 is vertical cavity surface emitting laser 134 with second laser generator 132, due to vertical cavity surface-emitting laser
The light emission direction and substrate transverse of device 134, the surface of emissions 1341 of two vertical cavity surface emitting lasers 134 is towards reflecting element 14
When, vertical cavity surface emitting laser 134 need to be in it is vertical place, vertical cavity surface emitting laser 134 be susceptible to fall, shift or
Shaking etc. is unexpected, therefore can be fixed vertical cavity surface emitting laser 134 by the way that fixing piece 19 is arranged, and prevents vertical cavity surface
Emitting laser 134 falls, shifts or shakes etc. unexpected.
Referring to Fig. 9, in some embodiments, fixing piece 19 is sealing 191, sealing 191 is arranged in mounting surface 1342
Between board unit 11.Sealing 191 be positioned only between mounting surface 1342 and board unit 11 can also reduce it is Nian Jie vertical
The amount of sealing 191 needed for cavity surface emitting lasers 134, can so reduce the manufacturing cost of project structured light module 10.Into
One step, sealing 181 can be heat-conducting glue, and first laser generator 131 and the work of second laser generator 132 are generated
Heat is conducted into board unit 11.
Referring to Fig. 10, in some embodiments, fixing piece 19 includes at least two be arranged on board unit 11
Flexible supporting frames 192, at least two supporting racks 192 clamp the joint face 1343 of vertical cavity surface emitting laser 134, with into one
Step prevents vertical cavity surface emitting laser 134 from shaking.
In some embodiments, the quantity of first laser generator 131 is multiple, the number of second laser generator 132
Amount is multiple, and each first laser generator 131 is oppositely arranged with a second laser generator 132.Multiple first lasers
Generator 131 emits multi beam first laser a, and multiple second laser generators 132 emit multi beam second laser b, and multi beam first swashs
Light a and multi beam second laser b pools convergence laser c after the reflection of reflecting element 16, in this way, further increasing convergence laser c
Irrelevance, to improve the accuracy of detection of project structured light module 10.
In some embodiments, the light intensity of first laser a is different from the light intensity of second laser b.Specifically, structure light is thrown
It further includes controller to penetrate module 10, and controller can control first laser generator 131 and emit first laser a, and control second
Laser generator 132 emits second laser b.Specifically, controller is for driving first laser generator 131 and second laser to send out
Raw device 132 emits laser.Controller can control the input current of first laser generator 131 and second laser generator 132.
Input current is bigger, and the laser intensity of transmitting is bigger.For example, the first laser a light intensity that first laser generator 131 emits is
L1, the second laser b light intensity that second laser generator 132 emits are L2, wherein L1 ≠ L2.In this way, by controlling first laser
The intensity of a and second laser b match, and convergence laser c after collimating element 15, diffraction optical element 16, can get successively
Hot spot of different shapes generates the higher laser pattern of irrelevance.It is of course also possible to be L1=L2.
In addition, the light intensity due to first laser a is different from the light intensity of second laser b, laser projection distance is also different.Laser
Light intensity is big, and laser projection distance is remote, and laser intensity is small, and laser projection distance is close, and therefore, controller can also be according to target object
Distance emit laser to control first laser generator 131 and second laser generator 132.In the embodiment of fig. 2,
Controller can be processor 30, i.e., processor 30 can be also used for 131 transmitting first laser a of control first laser generator,
And control second laser generator 132 emits second laser b.Specifically, image acquiring device 100 is first preliminary obtains target object
Depth image, after processor 30 judges the distance of target object according to depth image, then control and be turned on or off first
Laser generator 131 and second laser generator 132, raising first laser generator 131 and second laser generator 132 make
With the service life to improve accuracy of detection.For example, work of the operating power of first laser generator 131 than second laser generator 132
The rate of doing work is big, when judging target object distance structure light projection module 10 farther out, then opens first laser generator 131 and closes
Close second laser generator 132；When judging that target object distance structure light projection module 10 is closer, then second laser hair is opened
Raw device 132 and closing first laser generator 131.Certainly, when judging target object distance structure light projection module 10 farther out,
The power of first laser generator 131 can also be increased, reduce the power of second laser generator 132；When judging target object
When distance structure light projection module 10 is closer, the power of second laser generator 132 can also be increased, reduce first laser
The power of device 131, in this way, improving the irrelevance of convergence laser c to improve the accuracy of detection of project structured light module 10.
In some embodiments, controller can also control first laser generator 131 and second laser generator
132 transmitting duration.Specifically, a length of T1 when the transmitting of first laser generator 131, the transmitting of second laser generator 132
Shi Changwei T2.Controller can control 132 alternate emission of first laser generator 131 and second laser generator, for example, first
Laser generator 131 first continues the first laser a of T1 durations transmitting, and and then second laser generator 132 continues T2 transmittings
Second laser b is so recycled.Certainly, be also provided with time interval Δ T1 and Δ T2 between T1 and T2, i.e. T1, Δ T1,
T2, Δ T2, T1, Δ T1 ... cycles carry out.In other embodiments, controller can also control first laser generator 131 and
Persistently emit laser one of in second laser generator 132, another emits laser with the transmitting duration of T1 or T2.
In some embodiments, the laser pattern that first laser generator 131 emits and second laser generator 132
Laser pattern is different.Laser pattern is related with the type of its transmitter.When first laser generator 131 and second laser generator
132 when being vertical cavity surface emitting laser 134, can be by changing the VCSEL array density of setting on a semiconductor substrate
Size, array area size, to change the laser pattern of first laser a and second laser b.For example, first laser generator 131
VCSEL arranging density be more than second laser generator 132 VCSEL arranging density, then first laser generator 131 send out
The irrelevance for the laser pattern penetrated is higher than the irrelevance of the laser pattern of second laser generator 132.When first laser is sent out
When raw device 131 is edge-emitting laser 133 with second laser generator 132, edge-emitting laser 133 can be fabricated to wavelength
Edge-emitting laser 133 different, operating power is different.
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 (12)
1. a kind of project structured light module, which is characterized in that including：
First laser generator, the first laser generator is for emitting first laser；
The second laser generator being oppositely arranged with the first laser generator, the second laser generator is for emitting the
Dual-laser；And
Reflecting element, the first laser generator and the second laser generator are separately positioned on the phase of the reflecting element
Both sides are carried on the back, the reflecting element for reflecting the first laser and the second laser in the same direction.
2. project structured light module according to claim 1, which is characterized in that the reflecting element is prism, described anti-
It includes two the first reflecting parts and the second reflecting part for being located at prism inside and intersection to penetrate element, first reflecting part
Reflecting surface is opposite with the first laser generator to reflect the first laser, the reflecting surface of second reflecting part with it is described
Second laser generator is opposite to reflect the second laser.
3. project structured light module according to claim 1, which is characterized in that the reflecting element is prism, described anti-
It includes two the first reflectings surface and the second reflecting surface being located on the outside of the prism, first reflecting surface and described the to penetrate element
One laser generator is opposite to reflect the first laser, and second reflecting surface and the second laser generator are opposite with anti-
Penetrate the second laser.
4. project structured light module according to claim 1, which is characterized in that the reflecting element include the first prism and
Second prism, first prism include the first reflecting surface, and second prism includes the second reflecting surface, first reflecting surface
It is opposite with the first laser generator to reflect the first laser, second reflecting surface and the second laser generator
Relatively to reflect the second laser.
5. project structured light module according to claim 1, which is characterized in that the first laser generator and described the
Dual-laser generator is edge-emitting laser, and the first laser generator includes the first light-emitting surface, the second laser hair
Raw device includes the second light-emitting surface, and first surface of emission and second surface of emission are towards the reflecting element.
6. project structured light module according to claim 1, which is characterized in that the first laser generator and described the
Dual-laser generator is vertical cavity surface emitting laser.
7. project structured light module according to claim 1, which is characterized in that the light intensity of the first laser and described the
The light intensity of dual-laser is different.
8. project structured light module according to claim 1, which is characterized in that the laser pattern of the first laser and institute
The laser pattern for stating second laser is different.
9. project structured light module according to claim 1, which is characterized in that the project structured light module further includes base
Board group part and lens barrel, the lens barrel is arranged on the board unit and host cavity is collectively formed with the board unit, described
First laser generator, the second laser generator and the reflecting element are arranged on the board unit and accommodate
In the host cavity.
10. project structured light module according to claim 9, which is characterized in that the project structured light module further includes
The collimating element and diffraction optical element being arranged in the lens barrel, the first laser and the second laser are through the reflection
The convergence laser formed after being converged after element reflection, the convergence laser pass through the collimating element and the diffraction optics successively
Element.
11. a kind of image acquiring device, which is characterized in that including：
Project structured light module described in claims 1 to 10 any one；
Image acquisition device, described image collector is for acquiring the laser pattern projected by the project structured light module；And point
The processor not connect with the project structured light module and described image collector, the processor is for handling the laser
Pattern is to obtain depth image.
12. a kind of electronic equipment, which is characterized in that including：
Shell；And
Image acquiring device described in claim 11, described image acquisition device are arranged in the shell and from the shells
Exposure is to obtain depth image.
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| CN201810200857.6A CN108490595B (en) | 2018-03-12 | 2018-03-12 | Structured light projection module, image acquisition device and electronic equipment |
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