WO2019192238A1 - 衍射光学组件、激光投射模组、深度相机和电子装置 - Google Patents

衍射光学组件、激光投射模组、深度相机和电子装置 Download PDF

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Publication number
WO2019192238A1
WO2019192238A1 PCT/CN2019/070679 CN2019070679W WO2019192238A1 WO 2019192238 A1 WO2019192238 A1 WO 2019192238A1 CN 2019070679 W CN2019070679 W CN 2019070679W WO 2019192238 A1 WO2019192238 A1 WO 2019192238A1
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WO
WIPO (PCT)
Prior art keywords
diffractive
diffractive optical
sealing plate
optical element
projection module
Prior art date
Application number
PCT/CN2019/070679
Other languages
English (en)
French (fr)
Inventor
张学勇
Original Assignee
Oppo广东移动通信有限公司
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Filing date
Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Publication of WO2019192238A1 publication Critical patent/WO2019192238A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/2513—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object with several lines being projected in more than one direction, e.g. grids, patterns
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • 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
    • G02B27/0006—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation
    • 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
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0944—Diffractive optical elements, e.g. gratings, holograms
    • 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
    • G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
    • G02B27/20—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective for imaging minute objects, e.g. light-pointer
    • 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
    • G02B27/30—Collimators
    • 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
    • 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
    • G02B27/4233—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application
    • G02B27/425—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application in illumination systems
    • 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
    • G02B27/4272—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having plural diffractive elements positioned sequentially along the optical path
    • 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
    • G02B27/4272—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having plural diffractive elements positioned sequentially along the optical path
    • G02B27/4277—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having plural diffractive elements positioned sequentially along the optical path being separated by an air space
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/18—Diffraction gratings
    • G02B5/1842—Gratings for image generation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/50—Depth or shape recovery

Definitions

  • the present application relates to the field of imaging technologies, and in particular, to a diffractive optical component, a laser projection module, a depth camera, and an electronic device.
  • the laser projection module is composed of a light source, a collimating element, and a diffractive optical element (DOE).
  • DOE diffractive optical element
  • the surface of the DOE is typically a very fine diffractive surface.
  • Embodiments of the present application provide a diffractive optical component, a laser projection module, a depth camera, and an electronic device.
  • the diffractive optical component of the embodiment of the present application includes a sealing assembly and a diffractive optical element;
  • the sealing assembly includes a light transmissive first sealing plate, a light transmissive second sealing plate, and a spacer, the first sealing plate and the The second sealing plates are oppositely disposed, the spacers are spaced apart from the first sealing plate and the second sealing plate, and the first sealing plate, the second sealing plate and the spacers together form a closed capacity
  • the diffractive optical element is housed in the accommodating cavity, and the diffractive optical element includes a light transmitting diffractive body and a plurality of diffractive structures formed on the diffractive body.
  • the laser projection module of the embodiment of the present application includes a substrate assembly, a barrel assembly, a light source, a collimating element, and the diffractive optical assembly of the above embodiment; the barrel assembly is disposed on the substrate assembly and the substrate The components together form a receiving cavity; the light source is disposed on the substrate assembly and received in the receiving cavity; the collimating component is received in the receiving cavity; and the diffractive optical component is received in the receiving cavity.
  • the collimating element, the first sealing plate, the diffractive optical element, and the second sealing plate are sequentially disposed on an optical path of the light source.
  • the depth camera of the embodiment of the present application includes the laser projection module, the image collector and the processor according to the above embodiments; the image collector is configured to collect a laser pattern projected through the diffractive optical element and projected into the target space; The processor is respectively connected to the laser projection module and the image collector, and the processor is configured to process the laser pattern to obtain a depth image.
  • An electronic device of an embodiment of the present application includes a housing and the depth camera described in the above embodiment, the depth camera being disposed on the housing and exposed from the housing to acquire the depth image.
  • FIG. 1 is a schematic structural view of a laser projection module according to some embodiments of the present application.
  • FIG. 2 to FIG. 4 are partial schematic structural views of a laser projection module according to some embodiments of the present application.
  • 5 to 16 are schematic structural views of a diffractive optical component according to some embodiments of the present application.
  • FIG. 17 is a schematic structural diagram of a depth camera according to some embodiments of the present application.
  • FIG. 18 is a schematic structural diagram of an electronic device according to some embodiments of the present application.
  • the first feature "on” or “below” the second feature may be the direct contact of the first and second features, or the first and second features are indirectly through the intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.
  • the diffractive optical assembly 60 of the embodiment of the present application includes a seal assembly 62 and a diffractive optical element 64.
  • the seal assembly 62 includes a light transmissive first seal plate 622, a light transmissive second seal plate 624, and a spacer 626.
  • the first sealing plate 622 is disposed opposite to the second sealing plate 624.
  • the spacers 626 are spaced apart from the first sealing plate 622 and the second sealing plate 624.
  • the first sealing plate 622, the second sealing plate 624, and the spacers 626 together form a closed receiving cavity 628.
  • the diffractive optical element 64 is housed in the accommodating cavity 628.
  • the diffractive optical element 64 includes a light transmissive diffractive body 642 and a plurality of diffractive structures 644 formed on the diffractive body 642.
  • the first sealing plate 622 includes a first abutting surface 6222 opposite to the second sealing plate 624
  • the second sealing plate 624 includes a first surface opposite to the first sealing plate 622 .
  • the number of diffractive optical elements 64 is one, the diffractive optical element 64 is in contact with the first abutting surface 6222 and the second abutting surface 6242; or the number of diffractive optical elements 64 is at least two, and two of the at least two diffractive optical elements 64
  • the diffractive optical element 64 is in contact with the first abutting surface 6222 and the second abutting surface 6242, respectively.
  • the number of diffractive optical elements 64 is at least two, the adjacent two diffractive optical elements 64 are in contact; or the adjacent two diffractive optical elements 64 are spaced apart from one another.
  • the number of diffractive optical elements 64 is one, the diffractive body 642 includes opposite diffractive incident surfaces 6422 and diffractive exit surfaces 6424 , and the diffractive structures 644 are formed on the diffractive incident surface 6422 . Or / and the diffraction exit surface 6424; or the number of diffractive optical elements 64 is at least two, and the diffractive body 642 of each diffractive optical element 64 includes a opposite diffractive incident surface 6422 and a diffractive exit surface 6424, each diffractive optical element A diffractive structure 644 of 64 is formed on the corresponding diffractive incident surface 6422 or/and the diffractive exit surface 6424.
  • a laser projection module 100 of an embodiment of the present application includes a substrate assembly 10 , a lens barrel assembly 20 , a light source 40 , a collimating element 50 , and a diffractive optical assembly 60 .
  • the barrel assembly 20 is disposed on the substrate assembly 10 and forms a receiving cavity 21 together with the substrate assembly 10.
  • the light source 40 is disposed on the substrate assembly 10 and housed in the housing cavity 21.
  • the collimating element 50 is housed in the housing chamber 21.
  • the diffractive optical unit 60 is housed in the housing chamber 21.
  • the collimating element 50, the first sealing plate 622, the diffractive optical element 64, and the second sealing plate 624 are sequentially disposed on the optical path of the light source 40.
  • source 40 is an edge emitting laser.
  • the light source 40 includes a light emitting surface 41 that faces the collimating element 50.
  • the light emitting surface 41 is perpendicular to the collimating optical axis of the collimating element 50.
  • the edge emitting laser is a distributed feedback laser.
  • source 40 is a vertical cavity surface emitting laser.
  • the lens barrel assembly 20 includes a lens barrel 20a.
  • the lens barrel 20a includes a top portion 22 and a bottom portion 23 opposite to each other.
  • the lens barrel 20a is formed with a through hole 24 penetrating the top portion 22 and the bottom portion 23.
  • the bottom 23 is carried on the substrate assembly 10.
  • the inner wall of the lens barrel 20a extends to the center of the through hole 24 with an annular carrier 25.
  • the diffractive optical assembly 60 is carried on a carrier 25.
  • the substrate assembly 10 includes a circuit board 12 , and the light source 40 and the lens barrel assembly 20 are disposed on the circuit board 12 .
  • the substrate assembly 10 includes a substrate 11 and a circuit board 12 carried on the substrate 11 .
  • the circuit board 12 is provided with a via 121, and the light source 40 is carried on the substrate 11 and housed in the via 121.
  • the substrate 11 is provided with a heat dissipation hole 111 .
  • the collimating element 50 includes one or more lenses, one or more lenses disposed on the illuminating light path of the light source 40.
  • the lens is made of glass material; or the lens is made of plastic material.
  • the depth camera 400 of the embodiment of the present application includes a laser projection module 100 , an image collector 200 , and a processor 300 .
  • the image collector 200 is used to acquire a laser pattern projected through the diffractive optical element 64 into the target space.
  • the processor 300 is connected to the laser projection module 100 and the image collector 200, respectively, and the processor 300 is configured to process the laser pattern to obtain a depth image.
  • the electronic device 1000 of the embodiment of the present application includes a housing 500 and a depth camera 400 .
  • the depth camera 400 is disposed on the housing 500 and exposed from the housing 500 to acquire a depth image.
  • a laser projection module 100 of an embodiment of the present application includes a substrate assembly 10 , a lens barrel assembly 20 , a light source 40 , a collimating element 50 , and a diffractive optical assembly 60 .
  • the barrel assembly 20 is disposed on the substrate assembly 10 and forms a receiving cavity 21 together with the substrate assembly 10.
  • the light source 40, the collimating element 50, and the diffractive optical unit 60 are housed in the housing chamber 21.
  • the light source 40 is disposed on the substrate assembly 10, and the collimating element 50 and the diffractive optical assembly 60 are sequentially disposed on the optical path of the light source 40.
  • the substrate assembly 10 includes a substrate 11 and a circuit board 12 carried on the substrate 11.
  • the material of the substrate 11 may be plastic, for example, Polyethylene Glycol Terephthalate (PET), Polymethyl Methacrylate (PMMA), Polycarbonate (PC), Poly Any one or more of imide (Polyimide, PI).
  • PET Polyethylene Glycol Terephthalate
  • PMMA Polymethyl Methacrylate
  • PC Polycarbonate
  • PI Polyimide
  • the substrate 11 is light in weight and has sufficient support strength.
  • the circuit board 12 can be a hard board, a soft board or a soft and hard board.
  • a via 121 is formed in the circuit board 12.
  • the light source 40 is fixed to the substrate 11 through the via 121 and electrically connected to the circuit board 12.
  • a heat dissipation hole 111 may be formed on the substrate 11 , and heat generated by the operation of the light source 40 or the circuit board 12 may be dissipated from the heat dissipation hole 111 , and the heat dissipation hole may be filled in the heat dissipation hole 111 to further improve the heat dissipation performance of the substrate assembly 10 .
  • the barrel assembly 20 includes a barrel 20a that includes a top portion 22 and a bottom portion 23 that are opposite each other.
  • the lens barrel 20a is formed with a through hole 24 penetrating the top portion 22 and the bottom portion 23.
  • the bottom portion 23 is carried on the substrate assembly 10, and may be fixed on the circuit board 12 by glue or fixed on the circuit board 12 by snapping, soldering, screwing or the like.
  • the inner wall of the lens barrel 20a extends to the center of the through hole 24 with an annular carrier 25 on which the diffractive optical assembly 60 is carried.
  • the carrying platform 25 forms a light passing hole 26 that communicates with the receiving cavity 21.
  • Light source 40 is used to emit laser light.
  • the light source 40 may be a Vertical Cavity Surface Emitting Laser (VCSEL) or an edge-emitting laser (EEL).
  • the light source 40 is an edge emitting laser.
  • the light source 40 may be a Distributed Feedback Laser (DFB).
  • the light source 40 is for emitting laser light into the housing chamber 21. Referring to FIG. 2 , the light source 40 has a column shape as a whole, and the light source 40 forms a light emitting surface 41 away from one end surface of the substrate assembly 10 , and the laser light is emitted from the light emitting surface 41 .
  • the light emitting surface 41 faces the collimating element 50 and the light emitting surface 41 and the collimating element 50 .
  • the collimating optical axis is vertical, and the collimating optical axis passes through the center of the light emitting surface 41.
  • the light source 40 is fixed on the substrate assembly 10.
  • the light source 40 can be bonded to the substrate assembly 10 by a sealant 70.
  • a side of the light source 40 opposite to the light-emitting surface 41 is bonded to the substrate assembly 10. 1 and 3, the side surface 42 of the light source 40 may also be bonded to the substrate assembly 10.
  • the sealant 70 wraps around the side surface 42 or may bond only one side of the side surface 42 to the substrate assembly 10 or adhere. A plurality of faces and substrate assemblies 10 are bonded.
  • the sealant 70 may be a thermal conductive adhesive to conduct heat generated by the operation of the light source 40 into the substrate assembly 10.
  • the light source 40 of the laser projection module 100 adopts an edge emitting laser.
  • the temperature of the transmitting laser is smaller than that of the VCSEL array.
  • the edge emitting laser is a single-point light emitting structure, it is not necessary to design an array structure, and the manufacturing is simple.
  • the light source 40 of the laser projection module 100 is low in cost.
  • the gain of the power is obtained through the feedback of the grating structure.
  • the injection current increases, the power consumption of the distributed feedback laser increases and the heat generation is severe.
  • it is necessary to increase the length of the distributed feedback laser resulting in a distributed feedback laser generally having a slender structure.
  • the edge emitting laser has a slender strip structure, the emitting laser is prone to accidents such as dropping, shifting or shaking, and thus setting
  • the encapsulant 70 is capable of holding the edge emitting laser to prevent accidents such as dropping, displacement or shaking of the emitting laser.
  • the light source 40 can also be secured to the substrate assembly 10 in a fixed manner as shown in FIG.
  • the laser projection module 100 includes a plurality of elastic support blocks 80.
  • the support block 80 can be fixed on the substrate assembly 10.
  • the plurality of support blocks 80 collectively surround the light source 40.
  • the light source 40 can be directly mounted on multiple devices during installation. Between the support blocks 80. In one example, the plurality of support blocks 80 collectively clamp the light source 40 to further prevent the light source 40 from sloshing.
  • the collimating element 50 is used to collimate the laser light emitted by the light source 40.
  • the collimating element 50 includes an optical portion 52 and a mounting portion 54 surrounding the optical portion 52 for engaging the inner wall of the lens barrel 20a to fix the collimating element 50 on the lens barrel 20a, and the loading table 25 is located at the collimating element 50 is between the diffractive optical component 60.
  • the optical portion 52 includes two curved surfaces on opposite sides of the collimating element 50.
  • the mounting portion 54 is in contact with the carrier 25, and one of the curved surfaces of the optical portion 52 projects into the light-passing hole 26.
  • the annular carrier 25 can carry either the diffractive optical component 60 or the collimating component 50 and the diffractive optical component 60 without increasing the thickness of the laser projection module 100.
  • the collimating element 50 can include one or more lenses that are disposed coaxially in sequence on the illuminating light path of the source 40.
  • the shape of each lens may be any one of an aspherical surface, a spherical surface, a Fresnel surface, and a binary optical surface.
  • the lenses can be made of glass to solve the problem of temperature drift when the ambient temperature changes; or the lenses are made of plastic material, so that the cost is low and mass production is convenient.
  • the diffractive optical assembly 60 includes a seal assembly 62 and a diffractive optical element 64.
  • the seal assembly 62 includes a first seal plate 622, a second seal plate 624, and a spacer 626.
  • the first sealing plate 622 is disposed opposite to the second sealing plate 624.
  • the spacers 626 are spaced apart from the first sealing plate 622 and the second sealing plate 624. Spacer 626 can be annular.
  • the first sealing plate 622, the second sealing plate 624, and the spacers 626 together form a closed receiving cavity 628.
  • the first sealing plate 622 is carried on the carrying table 25, and the bottom of the first sealing plate 622 can be bonded to the loading table 25 by gluing, the side wall of the first sealing plate 622, the side wall of the second sealing plate 624, and the spacing
  • the sidewalls of the article 626 can also be bonded to the inner wall of the top portion 22 by gluing.
  • the first sealing plate 622 and the second sealing plate 624 may be made of a light transmissive material such as glass, polymethyl Methacrylate (PMMA), polycarbonate (Polycarbonate, PC), polyimide (Polyimide). , PI) and so on.
  • the material of the spacer 626 may be a polymer material such as an epoxy resin or a polyimide, or a metal, a metal alloy, or a glass.
  • the diffractive optical element 64 is housed in the accommodating cavity 628.
  • the collimating element 50, the first sealing plate 622, the diffractive optical element 64, and the second sealing plate 624 are sequentially disposed on the optical path of the light source 40.
  • the diffractive optical element 64 is used to diffract the collimated laser light of the collimating element 50 to form a laser pattern.
  • the first sealing plate 622 includes a first abutting surface 6222 opposite the second sealing plate 624, and the second sealing plate 624 includes a second abutting surface 6242 opposite the first sealing plate 622.
  • the diffractive optical element 64 is located between the first abutting surface 6222 and the second abutting surface 6242.
  • the diffractive optical element 64 includes a light transmissive diffractive body 642 and a plurality of diffractive structures 644 formed on the diffractive body 642.
  • the diffractive optical element 64 can be made of glass or a composite plastic such as PET.
  • the diffractive structure 644 can be formed on the diffractive body 642 by etching, nanoimprinting, or the like.
  • the diffractive structure 644 faces the light source 40 or the collimating element 50.
  • the surface of the DOE is usually a very fine diffractive surface.
  • moisture or other contaminants may adhere to the surface of the DOE, so that the diffraction efficiency of the DOE is reduced, and even The DOE diffracts the beam in a direction other than expected, burning the user's eyes.
  • the diffractive optical element 64 is housed in the enclosed accommodating cavity 628, and can protect the diffractive optical element 64 from moisture or other contaminants from damaging the diffractive optical element 64.
  • the well-sealed diffractive optical assembly 60 enables the laser projection module 100 to be used in high moisture and/or airborne particulate environments without damaging the user's eyes or reducing the optical performance of the laser projection module 100.
  • the diffractive optical element 64 may be first disposed on the first sealing plate 622, and then the spacer 626 may be disposed on the first sealing plate 622 such that the spacer 626 surrounds the diffractive optical element 64.
  • the second sealing plate 624 is disposed on the spacer 626 to effect sealing of the diffractive optical element 64; or, the diffractive optical element 64 is first disposed on the second sealing plate 624, and then the spacer 626 is disposed on the second sealing plate 624.
  • the spacer 626 is placed around the diffractive optical element 64, and the first sealing plate 622 is placed over the spacer 626 to effect sealing of the diffractive optical element 64.
  • the number of diffractive optical elements 64 may be one.
  • the diffractive body 642 includes opposing diffractive incident faces 6422 and diffractive exit faces 6424.
  • the diffractive optical element 64 is in contact with the first abutting surface 6222 and the second abutting surface 6242. Specifically, the diffractive incident surface 6422 is in contact with the first abutting surface 6222, and the diffractive exit surface 6424 is in contact with the second abutting surface 6242.
  • a diffractive structure 644 is formed on the diffractive exit surface 6424.
  • the second abutting surface 6242 is formed with a concave-convex structure engaged with the diffractive structure 644 such that the second sealing plate 624 is in close contact with the diffractive optical element 64.
  • the first abutting surface 6222 and the diffractive incident surface 6422 can be optically bonded. At this time, there is no gap between the diffractive optical element 64 and the first sealing plate 622, and there is no gap between the diffractive optical element 64 and the second sealing plate 624.
  • a diffractive structure 644 can be formed on the diffractive incident surface 6422.
  • the first abutting surface 6222 is formed with a concave-convex structure engaged with the diffractive structure 644 such that the first sealing plate 622 is in close contact with the diffractive optical element 64, and the second abutting surface 6242 and the diffractive emitting surface 6424 are optically bonded.
  • a diffractive structure 644 is formed on the diffractive incident surface 6422 and the diffractive exit surface 6424.
  • the first abutting surface 6222 is formed with a concave-convex structure that is engaged with the diffractive structure 644 of the diffractive incident surface 6422 such that the first sealing plate 622 is in close contact with the diffractive optical element 64, and the diffractive exit surface is formed on the second abutting surface 6242.
  • the diffractive structure 644 of 6424 engages the relief structure such that the second sealing plate 624 is in close contact with the diffractive optical element 64. At this time, there is no gap between the diffractive optical element 64 and the first sealing plate 622, and there is no gap between the diffractive optical element 64 and the second sealing plate 624.
  • the number of diffractive optical elements 64 may be at least two, such as three, four, six, eight, and the like.
  • the diffractive body 642 of each diffractive optical element 64 includes opposing diffractive incident faces 6422 and diffractive exit faces 6424. Two of the at least two diffractive optical elements 64 are in contact with the first abutting surface 6222 and the second abutting surface 6242, respectively.
  • the number of the diffractive optical elements 64 will be described as an example.
  • the diffractive optical element 64 includes a first diffractive optical element 64a and a second diffractive optical element 64b.
  • the collimating element 50, the first sealing plate 622, the first diffractive optical element 64a, the second diffractive optical element 64b, and the second sealing plate 624 are sequentially disposed on the optical path of the light source 40.
  • the first diffractive optical element 64a includes a first diffractive body 642a that transmits light and a plurality of diffractive structures 644 formed on the first diffractive body 642a.
  • the second diffractive optical element 64b includes a second diffractive body 642b that is transparent and formed in the first A plurality of diffractive structures 644 on the diffractive body 642b.
  • the first diffractive body 642a includes a first diffractive incident surface 6422a and a first diffractive exit surface 6424a
  • the second diffractive body 642b includes a second diffractive incident surface 6422b and a second diffractive exit surface 6424b.
  • the diffractive structure 644 of the first diffractive optical element 64a is formed on the first diffractive incident surface 6422a
  • the diffractive structure 644 of the second diffractive optical element 64b is formed in the second diffractive On the incident surface 6422b.
  • the first abutting surface 6222 is formed with a concave-convex structure that is engaged with the diffractive structure 644 of the first diffractive incident surface 6422a, so that the first sealing plate 622 is in close contact with the first diffractive optical element 64a, and the second abutting surface 6242 and the second The diffractive exit surface 6424b can be bonded by optical glue.
  • first diffractive optical element 64a and the first sealing plate 622 there is no gap between the first diffractive optical element 64a and the first sealing plate 622, and there is no gap between the second diffractive optical element 64b and the second sealing plate 624.
  • the first diffractive optical element 64a and the second diffractive optical element 64b are spaced apart from each other.
  • the diffractive structure 644 of the first diffractive optical element 64a is formed on the first diffractive incident surface 6422a, and the diffractive structure 644 of the second diffractive optical element 64b is formed in the first The second diffraction exit surface 6424b.
  • the first abutting surface 6222 is formed with a concave-convex structure that is engaged with the diffractive structure 644 of the first diffractive incident surface 6422a, so that the first sealing plate 622 is in close contact with the first diffractive optical element 64a, and the second abutting surface 6242 is formed thereon.
  • the concave-convex structure engaged with the diffractive structure 644 of the second diffraction exit surface 6424b is such that the second sealing plate 624 is in close contact with the second diffractive optical element 64b.
  • the first diffractive optical element 64a and the first sealing plate 622 are There is no gap therebetween, and there is no gap between the second diffractive optical element 64b and the second sealing plate 624.
  • the first diffractive optical element 64a and the second diffractive optical element 64b may be spaced apart from each other (as shown in FIG. 9); or the first diffractive optical element 64a may be in contact with the second diffractive optical element 64b, specifically the first diffractive exit surface 6424a is in contact with the second diffractive incident surface 6422b (as shown in FIG. 10).
  • the diffractive structure 644 of the first diffractive optical element 64a is formed on the first diffractive exit surface 6424a
  • the diffractive structure 644 of the second diffractive optical element 64b is formed in the first The second diffractive incident surface 6422b.
  • the first abutting surface 6222 and the first diffractive incident surface 6422a may be combined by optical glue
  • the second abutting surface 6242 and the second diffractive emitting surface 6424b may be combined by optical glue.
  • the first diffractive optical element 64a and the first sealing plate There is no gap between the 622, and there is no gap between the second diffractive optical element 64b and the second sealing plate 624.
  • the first diffractive optical element 64a and the second diffractive optical element 64b may be spaced apart from each other (as shown in FIG. 11); or the first diffractive optical element 64a may be in contact with the second diffractive optical element 64b, specifically the first diffractive exit surface
  • the diffractive structure 644 of 6424a meshes with the diffractive structure 644 of the second diffractive incident surface 6422b (as shown in FIG. 12).
  • the diffractive structure 644 of the first diffractive optical element 64a is formed on the first diffractive exit surface 6424a
  • the diffractive structure 644 of the second diffractive optical element 64b is formed on the second diffractive exit surface 6424b. on.
  • the first abutting surface 6222 and the first diffractive incident surface 6422a may be optically bonded
  • the second abutting surface 6242 is formed with a concave-convex structure that is engaged with the diffractive structure 644 of the second diffractive exit surface 6424b, so that the second sealing plate 624 and The second diffractive optical element 64b is in close contact with each other.
  • first diffractive optical element 64a and the first sealing plate 622 there is no gap between the first diffractive optical element 64a and the first sealing plate 622, and there is no gap between the second diffractive optical element 64b and the second sealing plate 624.
  • the first diffractive optical element 64a and the second diffractive optical element 64b are spaced apart from each other.
  • the diffractive structure 644 of the first diffractive optical element 64a is formed on the first diffractive incident surface 6422a and the first diffractive exit surface 6424a, and the diffractive structure 644 of the second diffractive optical element 64b is formed.
  • the first abutting surface 6222 is formed with a concave-convex structure that is engaged with the diffractive structure 644 of the first diffractive incident surface 6422a, so that the first sealing plate 622 is in close contact with the first diffractive optical element 64a, and the second abutting surface 6242 and the second The diffractive exit surface 6424b can be bonded by optical glue.
  • first diffractive optical element 64a and the first sealing plate 622 there is no gap between the first diffractive optical element 64a and the first sealing plate 622, and there is no gap between the second diffractive optical element 64b and the second sealing plate 624.
  • the first diffractive optical element 64a and the second diffractive optical element 64b may be spaced apart from each other; or the first diffractive optical element 64a may be in contact with the second diffractive optical element 64b, specifically the diffractive structure 644 of the first diffractive exit surface 6424a
  • the diffractive structure 644 of the diffractive incident surface 6422b is snapped (as shown in Figure 14).
  • the diffractive structure 644 of the first diffractive optical element 64a is formed on the first diffractive incident surface 6422a and the first diffractive exit surface 6424a, and the diffractive structure 644 of the second diffractive optical element 64b is formed in the second diffracted exit.
  • the first abutting surface 6222 is formed with a concave-convex structure that is engaged with the diffractive structure 644 of the first diffractive incident surface 6422a, so that the first sealing plate 622 is in close contact with the first diffractive optical element 64a, and the second abutting surface 6242 is formed thereon.
  • the concave-convex structure engaged with the diffractive structure 644 of the second diffraction exit surface 6424b is such that the second sealing plate 624 is in close contact with the second diffractive optical element 64b. At this time, there is no gap between the first diffractive optical element 64a and the first sealing plate 622, and there is no gap between the second diffractive optical element 64b and the second sealing plate 624.
  • the first diffractive optical element 64a and the second diffractive optical element 64b are spaced apart from each other.
  • the diffractive structure 644 of the first diffractive optical element 64a is formed on the first diffractive incident surface 6422a
  • the diffractive structure 644 of the second diffractive optical element 64b is formed on the second diffractive incident surface 6422b and the second diffracted exit.
  • face 6424b On face 6424b.
  • the first abutting surface 6222 is formed with a concave-convex structure that is engaged with the diffractive structure 644 of the first diffractive incident surface 6422a, so that the first sealing plate 622 is in close contact with the first diffractive optical element 64a, and the second abutting surface 6242 is formed thereon.
  • the concave-convex structure engaged with the diffractive structure 644 of the second diffraction exit surface 6424b is such that the second sealing plate 624 is in close contact with the second diffractive optical element 64b. At this time, there is no gap between the first diffractive optical element 64a and the first sealing plate 622, and there is no gap between the second diffractive optical element 64b and the second sealing plate 624.
  • the first diffractive optical element 64a and the second diffractive optical element 64b are spaced apart from each other.
  • the diffractive structure 644 of the first diffractive optical element 64a is formed on the first diffractive exit surface 6424a
  • the diffractive structure 644 of the second diffractive optical element 64b is formed on the second diffractive incident surface 6422b.
  • the second diffraction exit surface 6424b may be optically bonded
  • the second abutting surface 6242 is formed with a concave-convex structure that is engaged with the diffractive structure 644 of the second diffractive exit surface 6424b, so that the second sealing plate 624 and The second diffractive optical element 64b is in close contact.
  • first diffractive optical element 64a and the first sealing plate 622 there is no gap between the first diffractive optical element 64a and the first sealing plate 622, and there is no gap between the second diffractive optical element 64b and the second sealing plate 624.
  • the first diffractive optical element 64a and the second diffractive optical element 64b may be spaced apart from each other; or the first diffractive optical element 64a may be in contact with the second diffractive optical element 64b, specifically the diffractive structure 644 of the first diffractive exit surface 6424a
  • the diffractive structure 644 of the diffractive incident surface 6422b is snapped (as shown in Figure 15).
  • the diffractive structure 644 of the first diffractive optical element 64a is formed on the first diffractive incident surface 6422a and the first diffractive exit surface 6424a, and the diffractive structure 644 of the second diffractive optical element 64b is formed in the second diffractive incidence.
  • the first abutting surface 6222 is formed with a concave-convex structure that is engaged with the diffractive structure 644 of the first diffractive incident surface 6422a, so that the first sealing plate 622 is in close contact with the first diffractive optical element 64a, and the second abutting surface 6242 is formed thereon.
  • the concave-convex structure engaged with the diffractive structure 644 of the second diffraction exit surface 6424b is such that the second sealing plate 624 is in close contact with the second diffractive optical element 64b. At this time, there is no gap between the first diffractive optical element 64a and the first sealing plate 622, and there is no gap between the second diffractive optical element 64b and the second sealing plate 624.
  • the first diffractive optical element 64a and the second diffractive optical element 64b may be spaced apart from each other; or the first diffractive optical element 64a may be in contact with the second diffractive optical element 64b, specifically the diffractive structure 644 of the first diffractive exit surface 6424a The diffractive structure 644 of the diffractive incident surface 6422b is engaged.
  • the spacer 626 and the diffractive body 642 may be spaced apart from each other; or the spacer 626 may interfere with the diffractive body 642 (as shown in FIGS. 8 to 15).
  • the structure is similar to the structure when the number of the diffractive optical elements 64 is two, and will not be described in detail herein.
  • the diffractive optical element 64 when the number of diffractive optical elements 64 is one or at least two, can also be spaced apart from the first abutting surface 6222 and the second abutting surface 6242, that is, the diffractive optical element. 64 does not interfere with the first abutting surface 6222 nor with the second abutting surface 6242. At this time, the diffractive optical element 64 can be mounted on the spacer 626 through the sidewall of the diffractive body 642 to be fixedly received in the accommodating cavity 628 (as shown in FIG. 16).
  • the diffractive optical element 64 can be first mounted on the spacer 626 such that the spacer 626 surrounds the diffractive optical element 64, and the first sealing plate 622 and the second sealing plate 624 are respectively disposed on the spacer 626. The opposite sides of the two sides are used to achieve the sealing of the diffractive optical element 64.
  • the collimating element 50 and the substrate assembly 10 on which the light source 40 is mounted are placed in the through hole 24 in order from the bottom portion 23 of the lens barrel 20a along the optical path.
  • the light source 40 can be mounted on the substrate assembly 10 first, and then the substrate assembly 10 on which the light source 40 is mounted is fixed to the bottom portion 23.
  • the diffractive optical assembly 60 is placed into the through hole 24 from the top 22 against the direction of the optical path and carried on the carrying table 25, and causes the first sealing plate 622 to interfere with the carrying table 25.
  • the laser projection module 100 has a simple structure and is easy to assemble.
  • the depth camera 400 of the embodiment of the present application includes the laser projection module 100, the image collector 200, and the processor 300 of any of the above embodiments.
  • the image collector 200 is used to acquire a laser pattern projected through the diffractive optical element 64 into the target space.
  • the processor 300 is connected to the laser projection module 100 and the image collector 200, respectively.
  • the processor 300 is for processing a laser pattern to obtain a depth image.
  • the laser projection module 100 projects the laser pattern projected into the target space outward through the projection window 401, and the image collector 200 collects the laser pattern modulated by the target object through the acquisition window 402.
  • the image collector 200 may be an infrared camera.
  • the processor 300 calculates an offset value of each pixel point in the laser pattern and a corresponding pixel point in the reference pattern by using an image matching algorithm, and further obtains the depth of the laser pattern according to the deviation value.
  • image may be a Digital Image Correlation (DIC) algorithm. Of course, other image matching algorithms can be used instead of the DIC algorithm.
  • DIC Digital Image Correlation
  • an electronic device 1000 includes a housing 500 and a depth camera 400 of the above embodiment.
  • the depth camera 400 is disposed within the housing 500 and exposed from the housing 500 to acquire a depth image.
  • the electronic device 1000 includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart bracelet, a smart watch, a smart helmet, smart glasses, and the like.
  • the housing 500 can provide the depth camera 400 with protection against dust, water, drop, and the like.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, for example two, three, unless specifically defined otherwise.

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  • Projection Apparatus (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

一种衍射光学组件(60)、激光投射模组(100)、深度相机(400)和电子装置(1000)，衍射光学组件(60)包括密封组件(62)和衍射光学元件(64)。密封组件(62)包括透光的第一密封板(622)、透光的第二密封板(624)、和间隔物(626)。第一密封板(622)与第二密封板(624)相对设置。间隔物(626)间隔第一密封板(622)和第二密封板(624)。第一密封板(622)、第二密封板(624)及间隔物(626)共同形成封闭的容置腔(628)。衍射光学元件(64)收容在容置腔(628)内。衍射光学元件(64)包括透光的衍射本体(642)及形成在衍射本体(642)上的多个衍射结构(644)。

Description

衍射光学组件、激光投射模组、深度相机和电子装置
优先权信息
本申请请求2018年4月4日向中国国家知识产权局提交的、专利申请号为201810294924.5的专利申请的优先权和权益，并且通过参照将其全文并入此处。
技术领域
本申请涉及成像技术领域，特别涉及一种衍射光学组件、激光投射模组、深度相机和电子装置。
背景技术
激光投射模组由光源、准直元件和衍射光学元件(diffractive optical elements，DOE)组成。DOE的表面通常为非常精细的衍射表面。
发明内容
本申请实施方式提供一种衍射光学组件、激光投射模组、深度相机和电子装置。
本申请实施方式的衍射光学组件，包括密封组件和衍射光学元件；所述密封组件包括透光的第一密封板、透光的第二密封板、和间隔物，所述第一密封板与所述第二密封板相对设置，所述间隔物间隔所述第一密封板和所述第二密封板，所述第一密封板、所述第二密封板及所述间隔物共同形成封闭的容置腔；所述衍射光学元件收容在所述容置腔内，所述衍射光学元件包括透光的衍射本体及形成在所述衍射本体上的多个衍射结构。
本申请实施方式的激光投射模组包括基板组件、镜筒组件、光源、准直元件和上述实施方式所述的衍射光学组件；所述镜筒组件设置在所述基板组件上并与所述基板组件共同形成收容腔；所述光源设置在所述基板组件上并收容在所述收容腔内；所述准直元件收容在所述收容腔内；所述衍射光学组件收容在所述收容腔内，所述准直元件、所述第一密封板、所述衍射光学元件及所述第二密封板依次设置在所述光源的光路上。
本申请实施方式的深度相机包括上述实施方式所述的激光投射模组、图像采集器和处理器；所述图像采集器用于采集经所述衍射光学元件后向目标空间中投射的激光图案；所述处理器分别与所述激光投射模组、及所述图像采集器连接，所述处理器用于处理所述激光图案以获得深度图像。
本申请实施方式的电子装置包括壳体和上述实施方式所述的深度相机，所述深度相机设置在所述壳体上并从所述壳体上暴露以获取所述深度图像。
本申请实施方式的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
附图说明
本申请的上述和/或附加的方面和优点可以从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：
图1是本申请某些实施方式的激光投射模组的结构示意图；
图2至图4是本申请某些实施方式的激光投射模组的部分结构示意图；
图5至图16是本申请某些实施方式的衍射光学组件的结构示意图；
图17是本申请某些实施方式的深度相机的结构示意图；
图18是本申请某些实施方式的电子装置的结构示意图。
具体实施方式
以下结合附图对本申请的实施方式作进一步说明。附图中相同或类似的标号自始至终表示相同或类似的元件或具有相同或类似功能的元件。
另外，下面结合附图描述的本申请的实施方式是示例性的，仅用于解释本申请的实施方式，而不能理解为对本申请的限制。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
请参阅图5，本申请实施方式的衍射光学组件60包括密封组件62和衍射光学元件64。密封组件62包括透光的第一密封板622、透光的第二密封板624、和间隔物626。第一密封板622与第二密封板624相对设置。间隔物626间隔第一密封板622和第二密封板624。第一密封板622、第二密封板624及间隔物626共同形成封闭的容置腔628。衍射光学元件64收容在容置腔628内。衍射光学元件64包括透光的衍射本体642及形成在衍射本体642上的多个衍射结构644。
请参阅图5和图8，在某些实施方式中，第一密封板622包括与第二密封板624 相对的第一抵触面6222，第二密封板624包括与第一密封板622相对的第二抵触面6242。衍射光学元件64的数量为一个，衍射光学元件64与第一抵触面6222及第二抵触面6242抵触；或者衍射光学元件64的数量为至少两个，至少两个衍射光学元件64中的两个衍射光学元件64分别与第一抵触面6222及第二抵触面6242抵触。
请参阅图8和图10，在某些实施方式中，衍射光学元件64的数量为至少两个，相邻的两个衍射光学元件64抵触；或相邻的两个衍射光学元件64相互间隔。
请参阅图5和图8，在某些实施方式中，衍射光学元件64的数量为一个，衍射本体642包括相背的衍射入射面6422与衍射出射面6424，衍射结构644形成在衍射入射面6422或/和衍射出射面6424上；或衍射光学元件64的数量为至少两个，每个衍射光学元件64的衍射本体642包括相背的衍射入射面6422与衍射出射面6424，每个衍射光学元件64的衍射结构644形成在对应的衍射入射面6422或/和衍射出射面6424上。
请参阅图1，本申请实施方式的激光投射模组100包括基板组件10、镜筒组件20、光源40、准直元件50和衍射光学组件60。镜筒组件20设置在基板组件10上并与基板组件10共同形成收容腔21。光源40设置在基板组件10上并收容在收容腔21内。准直元件50收容在收容腔21内。衍射光学组件60收容在收容腔21内。准直元件50、第一密封板622、衍射光学元件64及第二密封板624依次设置在光源40的光路上。
请参阅图1和图2，在某些实施方式中，光源40为边发射激光器。光源40包括发光面41，发光面41朝向准直元件50。
请参阅图1，在某些实施方式中，发光面41与准直元件50的准直光轴垂直。
请参阅图1，在某些实施方式中，边发射激光器为分布反馈式激光器。
请参阅图1，在某些实施方式中，光源40为垂直腔面发射激光器。
请参阅图1，在某些实施方式中，镜筒组件20包括镜筒20a。镜筒20a包括相背的顶部22及底部23。镜筒20a形成有贯穿顶部22及底部23的通孔24。底部23承载在基板组件10上。镜筒20a的内壁向通孔24的中心延伸有环形承载台25。衍射光学组件60承载在承载台25上。
请参阅图1，在某些实施方式中，基板组件10包括电路板12，光源40及镜筒组件20设置在电路板12上。
请参阅图1，在某些实施方式中，基板组件10包括基板11及承载在基板11上的电路板12。电路板12开设有过孔121，光源40承载在基板11上并收容在过孔121内。
请参阅图1，在某些实施方式中，基板11开设有散热孔111。
请参阅图1，在某些实施方式中，准直元件50包括一个或多个透镜，一个或多个透镜设置在光源40的发光光路上。
请参阅图1，在某些实施方式中，透镜由玻璃材质制成；或者透镜由塑料材质制成。
请参阅图17，本申请实施方式的深度相机400包括激光投射模组100、图像采集器200和处理器300。图像采集器200用于采集经衍射光学元件64后向目标空间中投射的激光图案。处理器300分别与激光投射模组100、及图像采集器200连接，处理器300用于处理激光图案以获得深度图像。
请参阅图18，本申请实施方式的电子装置1000包括壳体500和深度相机400。深度相机400设置在壳体500上并从壳体500上暴露以获取深度图像。
请参阅图1，本申请实施方式的激光投射模组100包括基板组件10、镜筒组件20、光源40、准直元件50和衍射光学组件60。镜筒组件20设置在基板组件10上并与基板组件10共同形成收容腔21。光源40、准直元件50、及衍射光学组件60均收容在收容腔21内。光源40设置在基板组件10上，准直元件50和衍射光学组件60依次设置在光源40的光路上。
基板组件10包括基板11及承载在基板11上的电路板12。基板11的材料可以为塑料，例如，聚对苯二甲酸乙二醇酯(Polyethylene Glycol Terephthalate，PET)、聚甲基丙烯酸甲酯(Polymethyl Methacrylate，PMMA)、聚碳酸酯(Polycarbonate，PC)、聚酰亚胺(Polyimide，PI)中的任意一种或多种。如此，基板11的质量较轻且具有足够的支撑强度。电路板12可以是硬板、软板或软硬结合板。电路板12上开设有过孔121。光源40通过过孔121固定在基板11上并与电路板12电连接。基板11上可以开设有散热孔111，光源40或电路板12工作产生的热量可以由散热孔111散出，散热孔111内还可以填充导热胶，以进一步提高基板组件10的散热性能。
镜筒组件20包括镜筒20a，镜筒20a包括相背的顶部22及底部23。镜筒20a形成有贯穿顶部22及底部23的通孔24。底部23承载在基板组件10上，具体可通过胶水固定在电路板12上或者通过卡合、焊接、螺纹连接等方式固定在电路板12上。镜筒20a的内壁向通孔24的中心延伸有环形承载台25，衍射光学组件60承载在承载台25上。承载台25形成与收容腔21连通的通光孔26。
光源40用于发射激光。光源40可以是垂直腔面发射激光器(Vertical Cavity Surface Emitting Laser，VCSEL)或者边发射激光器(edge-emitting laser，EEL)。在如图1所示的实施例中，光源40为边发射激光器，具体地，光源40可以为分布反馈式激光器(Distributed Feedback Laser，DFB)。光源40用于向收容腔21内发射激光。请结合 图2，光源40整体呈柱状，光源40远离基板组件10的一个端面形成发光面41，激光从发光面41发出，发光面41朝向准直元件50且发光面41与准直元件50的准直光轴垂直，准直光轴穿过发光面41的中心。光源40固定在基板组件10上，具体地，光源40可以通过封胶70粘结在基板组件10上，例如光源40的与发光面41相背的一面粘接在基板组件10上。请结合图1和图3，光源40的侧面42也可以粘接在基板组件10上，封胶70包裹住四周的侧面42，也可以仅粘结侧面42的某一个面与基板组件10或粘结某几个面与基板组件10。此时封胶70可以为导热胶，以将光源40工作产生的热量传导至基板组件10中。
上述的激光投射模组100的光源40采用边发射激光器，一方面边发射激光器较VCSEL阵列的温漂较小，另一方面，由于边发射激光器为单点发光结构，无需设计阵列结构，制作简单，激光投射模组100的光源40成本较低。
分布反馈式激光器的激光在传播时，经过光栅结构的反馈获得功率的增益。要提高分布反馈式激光器的功率，需要通过增大注入电流和/或增加分布反馈式激光器的长度，由于增大注入电流会使得分布反馈式激光器的功耗增大并且出现发热严重的问题，因此，为了保证分布反馈式激光器能够正常工作，需要增加分布反馈式激光器的长度，导致分布反馈式激光器一般呈细长条结构。当边发射激光器的发光面41朝向准直元件50时，边发射激光器呈竖直放置，由于边发射激光器呈细长条结构，边发射激光器容易出现跌落、移位或晃动等意外，因此通过设置封胶70能够将边发射激光器固定住，防止边发射激光器发生跌落、位移或晃动等意外。
在某些实施方式中，光源40也可以采用如图4所示的固定方式固定在基板组件10上。具体地，激光投射模组100包括多个弹性的支撑块80，支撑块80可以固定在基板组件10上，多个支撑块80共同包围光源40，在安装时可以将光源40直接安装在多个支撑块80之间。在一个例子中，多个支撑块80共同夹持光源40，以进一步防止光源40发生晃动。
准直元件50用于准直光源40发射的激光。准直元件50包括光学部52和环绕光学部52的安装部54，安装部54用于与镜筒20a的内壁结合以使准直元件50固定在镜筒20a上，承载台25位于准直元件50与衍射光学组件60之间。在本实施方式中，光学部52包括位于准直元件50相背两侧的两个曲面。安装部54与承载台25抵触，光学部52的其中一个曲面伸入通光孔26内。如此，在不增加激光投射模组100的厚度的同时，环形承载台25既可以承载衍射光学组件60，也可以间隔准直元件50与衍射光学组件60。
在某些实施方式中，准直元件50可包括一个或多个透镜，一个或多个透镜共轴 依次设置在光源40的发光光路上。每个透镜的面型可以为非球面、球面、菲涅尔面、二元光学面中的任意一种。透镜可均由玻璃材质制成，以解决环境温度变化时透镜会产生温漂现象的问题；或者透镜均由塑料材质制成，以使得成本较低、便于量产。
请一并参阅图1及图5，衍射光学组件60包括密封组件62和衍射光学元件64。
密封组件62包括第一密封板622、第二密封板624、和间隔物626。第一密封板622与第二密封板624相对设置。间隔物626间隔第一密封板622和第二密封板624。间隔物626可以为环状。第一密封板622、第二密封板624及间隔物626共同形成封闭的容置腔628。第一密封板622承载在承载台25上，第一密封板622的底部可通过胶合的方式与承载台25结合，第一密封板622的侧壁、第二密封板624的侧壁、和间隔物626的侧壁也均可通过胶合的方式与顶部22的内壁结合。第一密封板622和第二密封板624可以由透光材料制成，例如玻璃、聚甲基丙烯酸甲酯(Polymethyl Methacrylate，PMMA)、聚碳酸酯(Polycarbonate，PC)、聚酰亚胺(Polyimide，PI)等。由于玻璃、PMMA、PC、及PI等透光材料均具有优异的透光性能，第一密封板622和第二密封板624不会由于遮挡光线而影响激光投射模组100的正常工作。间隔物626的材质可以为环氧树脂、聚酰亚胺等聚合材料，或者金属、金属合金、玻璃等。
衍射光学元件64收容在容置腔628内，准直元件50、第一密封板622、衍射光学元件64及第二密封板624依次设置在光源40的光路上。衍射光学元件64用于衍射准直元件50准直后的激光以形成激光图案。第一密封板622包括与第二密封板624相对的第一抵触面6222，第二密封板624包括与第一密封板622相对的第二抵触面6242。衍射光学元件64位于第一抵触面6222与第二抵触面6242之间。衍射光学元件64包括透光的衍射本体642及形成在衍射本体642上的多个衍射结构644。衍射光学元件64可以由玻璃或复合塑料(如PET)制成。衍射结构644可通过蚀刻、纳米压印等方式形成在衍射本体642上。衍射结构644朝向光源40或准直元件50。
可以理解，DOE的表面通常为非常精细的衍射表面，然而在激光投射模组的生产或者使用过程中，水分或其他污染物可能会粘附到DOE的表面，使得DOE的衍射效率降低，甚至导致DOE沿预期之外的方向衍射光束，灼伤用户的眼睛。本申请实施方式中，衍射光学元件64收容在封闭的容置腔628内，可以对衍射光学元件64起到保护的作用，防止水分或其他污染物损坏衍射光学元件64。另外，密封良好的衍射光学组件60使得激光投射模组100能够在高水分和/或气载颗粒环境中使用，而不会使用户的眼睛受伤或降低激光投射模组100的光学性能。
在制造上述衍射光学组件60时，可以先将衍射光学元件64设置第一密封板622 上，然后再将间隔物626设置在第一密封板622上并使得间隔物626环绕衍射光学元件64，再将第二密封板624设置在间隔物626上以实现衍射光学元件64的密封；或者，先将衍射光学元件64设置第二密封板624上，然后再将间隔物626设置在第二密封板624上并使得间隔物626环绕衍射光学元件64，再将第一密封板622设置在间隔物626上以实现衍射光学元件64的密封。
请一并参阅图5至图7，衍射光学元件64的数量可以为一个。衍射本体642包括相背的衍射入射面6422与衍射出射面6424。衍射光学元件64与第一抵触面6222及第二抵触面6242抵触。具体地，衍射入射面6422与第一抵触面6222抵触，衍射出射面6424与第二抵触面6242抵触。
进一步地，请参阅图5，在某些实施方式中，衍射结构644形成在衍射出射面6424上。第二抵触面6242上形成有与衍射结构644咬合的凹凸结构，以使第二密封板624与衍射光学元件64紧密相接，第一抵触面6222与衍射入射面6422可通过光学胶结合。此时，衍射光学元件64与第一密封板622之间没有空隙，衍射光学元件64与第二密封板624之间也没有空隙。
请参阅图6，在某些实施方式中，衍射结构644可形成在衍射入射面6422上。第一抵触面6222上形成有与衍射结构644咬合的凹凸结构，以使第一密封板622与衍射光学元件64紧密相接，第二抵触面6242与衍射出射面6424可通过光学胶结合。此时，衍射光学元件64与第一密封板622之间没有空隙，衍射光学元件64与第二密封板624之间也没有空隙。
请参阅图7，在某些实施方式中，衍射结构644形成在衍射入射面6422和衍射出射面6424上。第一抵触面6222上形成有与衍射入射面6422的衍射结构644咬合的凹凸结构，以使第一密封板622与衍射光学元件64紧密相接，第二抵触面6242上形成有与衍射出射面6424的衍射结构644咬合的凹凸结构，以使第二密封板624与衍射光学元件64紧密相接。此时，衍射光学元件64与第一密封板622之间没有空隙，衍射光学元件64与第二密封板624之间也没有空隙。
请一并参阅图8至图15，衍射光学元件64的数量可以为至少两个，例如三个、四个、六个、八个等。每个衍射光学元件64的衍射本体642包括相背的衍射入射面6422与衍射出射面6424。至少两个衍射光学元件64中的两个衍射光学元件64分别与第一抵触面6222及第二抵触面6242抵触。下面以衍射光学元件64的数量为两个为例进行说明，衍射光学元件64包括第一衍射光学元件64a和第二衍射光学元件64b。准直元件50、第一密封板622、第一衍射光学元件64a、第二衍射光学元件64b、及第二密封板624依次设置在光源40的光路上。第一衍射光学元件64a包括透光的第 一衍射本体642a及形成在第一衍射本体642a上的多个衍射结构644，第二衍射光学元件64b包括透光的第二衍射本体642b及形成在第二衍射本体642b上的多个衍射结构644。第一衍射本体642a包括相背的第一衍射入射面6422a与第一衍射出射面6424a，第二衍射本体642b包括相背的第二衍射入射面6422b与第二衍射出射面6424b。
进一步地，请参阅图8，在某些实施方式中，第一衍射光学元件64a的衍射结构644形成在第一衍射入射面6422a上，第二衍射光学元件64b的衍射结构644形成在第二衍射入射面6422b上。第一抵触面6222上形成有与第一衍射入射面6422a的衍射结构644咬合的凹凸结构，以使第一密封板622与第一衍射光学元件64a紧密相接，第二抵触面6242与第二衍射出射面6424b可通过光学胶结合。此时，第一衍射光学元件64a与第一密封板622之间没有空隙，第二衍射光学元件64b与第二密封板624之间也没有空隙。第一衍射光学元件64a与第二衍射光学元件64b相互间隔。
请一并参阅图9及图10，在某些实施方式中，第一衍射光学元件64a的衍射结构644形成在第一衍射入射面6422a上，第二衍射光学元件64b的衍射结构644形成在第二衍射出射面6424b上。第一抵触面6222上形成有与第一衍射入射面6422a的衍射结构644咬合的凹凸结构，以使第一密封板622与第一衍射光学元件64a紧密相接，第二抵触面6242上形成有与第二衍射出射面6424b的衍射结构644咬合的凹凸结构，以使第二密封板624与第二衍射光学元件64b紧密相接，此时，第一衍射光学元件64a与第一密封板622之间没有空隙，第二衍射光学元件64b与第二密封板624之间也没有空隙。第一衍射光学元件64a与第二衍射光学元件64b可以是相互间隔的(如图9所示)；或者，第一衍射光学元件64a与第二衍射光学元件64b抵触，具体为第一衍射出射面6424a与第二衍射入射面6422b抵触(如图10所示)。
请一并参阅图11及图12，在某些实施方式中，第一衍射光学元件64a的衍射结构644形成在第一衍射出射面6424a上，第二衍射光学元件64b的衍射结构644形成在第二衍射入射面6422b上。第一抵触面6222与第一衍射入射面6422a可通过光学胶结合，第二抵触面6242与第二衍射出射面6424b可通过光学胶结合，此时，第一衍射光学元件64a与第一密封板622之间没有空隙，第二衍射光学元件64b与第二密封板624之间也没有空隙。第一衍射光学元件64a与第二衍射光学元件64b可以是相互间隔的(如图11所示)；或者，第一衍射光学元件64a与第二衍射光学元件64b抵触，具体为第一衍射出射面6424a的衍射结构644与第二衍射入射面6422b的衍射结构644咬合(如图12所示)。
请参阅图13，在某些实施方式中，第一衍射光学元件64a的衍射结构644形成在第一衍射出射面6424a上，第二衍射光学元件64b的衍射结构644形成在第二衍射出 射面6424b上。第一抵触面6222与第一衍射入射面6422a可通过光学胶结合，第二抵触面6242上形成有与第二衍射出射面6424b的衍射结构644咬合的凹凸结构，以使第二密封板624与第二衍射光学元件64b紧密相接，此时，第一衍射光学元件64a与第一密封板622之间没有空隙，第二衍射光学元件64b与第二密封板624之间也没有空隙。第一衍射光学元件64a与第二衍射光学元件64b相互间隔。
请参阅图14，在某些实施方式中，第一衍射光学元件64a的衍射结构644形成在第一衍射入射面6422a和第一衍射出射面6424a上，第二衍射光学元件64b的衍射结构644形成在第二衍射入射面6422b上。第一抵触面6222上形成有与第一衍射入射面6422a的衍射结构644咬合的凹凸结构，以使第一密封板622与第一衍射光学元件64a紧密相接，第二抵触面6242与第二衍射出射面6424b可通过光学胶结合。此时，第一衍射光学元件64a与第一密封板622之间没有空隙，第二衍射光学元件64b与第二密封板624之间也没有空隙。第一衍射光学元件64a与第二衍射光学元件64b可以是相互间隔的；或者，第一衍射光学元件64a与第二衍射光学元件64b抵触，具体为第一衍射出射面6424a的衍射结构644与第二衍射入射面6422b的衍射结构644咬合(如图14所示)。
在某些实施方式中，第一衍射光学元件64a的衍射结构644形成在第一衍射入射面6422a和第一衍射出射面6424a上，第二衍射光学元件64b的衍射结构644形成在第二衍射出射面6424b上。第一抵触面6222上形成有与第一衍射入射面6422a的衍射结构644咬合的凹凸结构，以使第一密封板622与第一衍射光学元件64a紧密相接，第二抵触面6242上形成有与第二衍射出射面6424b的衍射结构644咬合的凹凸结构，以使第二密封板624与第二衍射光学元件64b紧密相接。此时，第一衍射光学元件64a与第一密封板622之间没有空隙，第二衍射光学元件64b与第二密封板624之间也没有空隙。第一衍射光学元件64a与第二衍射光学元件64b相互间隔。
在某些实施方式中，第一衍射光学元件64a的衍射结构644形成在第一衍射入射面6422a上，第二衍射光学元件64b的衍射结构644形成在第二衍射入射面6422b和第二衍射出射面6424b上。第一抵触面6222上形成有与第一衍射入射面6422a的衍射结构644咬合的凹凸结构，以使第一密封板622与第一衍射光学元件64a紧密相接，第二抵触面6242上形成有与第二衍射出射面6424b的衍射结构644咬合的凹凸结构，以使第二密封板624与第二衍射光学元件64b紧密相接。此时，第一衍射光学元件64a与第一密封板622之间没有空隙，第二衍射光学元件64b与第二密封板624之间也没有空隙。第一衍射光学元件64a与第二衍射光学元件64b相互间隔。
请参阅图15，在某些实施方式中，第一衍射光学元件64a的衍射结构644形成在 第一衍射出射面6424a上，第二衍射光学元件64b的衍射结构644形成在第二衍射入射面6422b和第二衍射出射面6424b上。第一抵触面6222与第一衍射入射面6422a可通过光学胶结合，第二抵触面6242上形成有与第二衍射出射面6424b的衍射结构644咬合的凹凸结构，以使第二密封板624与第二衍射光学元件64b紧密相接。此时，第一衍射光学元件64a与第一密封板622之间没有空隙，第二衍射光学元件64b与第二密封板624之间也没有空隙。第一衍射光学元件64a与第二衍射光学元件64b可以是相互间隔的；或者，第一衍射光学元件64a与第二衍射光学元件64b抵触，具体为第一衍射出射面6424a的衍射结构644与第二衍射入射面6422b的衍射结构644咬合(如图15所示)。
在某些实施方式中，第一衍射光学元件64a的衍射结构644形成在第一衍射入射面6422a和第一衍射出射面6424a上，第二衍射光学元件64b的衍射结构644形成在第二衍射入射面6422b和第二衍射出射面6424b上。第一抵触面6222上形成有与第一衍射入射面6422a的衍射结构644咬合的凹凸结构，以使第一密封板622与第一衍射光学元件64a紧密相接，第二抵触面6242上形成有与第二衍射出射面6424b的衍射结构644咬合的凹凸结构，以使第二密封板624与第二衍射光学元件64b紧密相接。此时，第一衍射光学元件64a与第一密封板622之间没有空隙，第二衍射光学元件64b与第二密封板624之间也没有空隙。第一衍射光学元件64a与第二衍射光学元件64b可以是相互间隔的；或者，第一衍射光学元件64a与第二衍射光学元件64b抵触，具体为第一衍射出射面6424a的衍射结构644与第二衍射入射面6422b的衍射结构644咬合。
上述各实施方式中，间隔物626与衍射本体642可以相互间隔的；或者，间隔物626与衍射本体642抵触(如图8至图15所示)。
需要指出的是，当衍射光学元件64的数量大于两个时，其结构与衍射光学元件64的数量为两个时的结构类似，在此不再详细说明。
在其他实施方式中，当衍射光学元件64的数量为一个或者至少两个时，衍射光学元件64也可与第一抵触面6222及第二抵触面6242间隔设置，也即是说，衍射光学元件64既不与第一抵触面6222抵触，也不与第二抵触面6242抵触。此时，衍射光学元件64可以通过衍射本体642的侧壁安装在间隔物626上，以实现固定收容在容置腔628内(如图16所示)。在制造衍射光学组件60时，可先将衍射光学元件64安装在间隔物626上使得间隔物626环绕衍射光学元件64，再分别将第一密封板622和第二密封板624设置在间隔物626的相对两侧以实现衍射光学元件64的密封。
在组装上述激光投射模组100时，沿着光路从镜筒20a的底部23依次向通孔24 内放入准直元件50、及安装好光源40的基板组件10。光源40可以先安装在基板组件10上，然后再将安装有光源40的基板组件10与底部23固定。逆着光路的方向从顶部22将衍射光学组件60放入通孔24并承载在承载台25上，并使得第一密封板622与承载台25抵触。激光投射模组100的结构简单，组装方便。
请参阅图17，本申请实施方式的深度相机400包括上述任一实施方式的激光投射模组100、图像采集器200、及处理器300。图像采集器200用于采集经衍射光学元件64后向目标空间中投射的激光图案。处理器300分别与激光投射模组100、及图像采集器200连接。处理器300用于处理激光图案以获得深度图像。
具体地，激光投射模组100通过投射窗口401向外投射向目标空间中投射的激光图案，图像采集器200通过采集窗口402采集被目标物体调制后的激光图案。图像采集器200可为红外相机，处理器300采用图像匹配算法计算出该激光图案中各像素点与参考图案中的对应各个像素点的偏离值，再根据该偏离值进一步获得该激光图案的深度图像。其中，图像匹配算法可为数字图像相关(Digital Image Correlation，DIC)算法。当然，也可以采用其它图像匹配算法代替DIC算法。
请参阅图18，本申请实施方式的电子装置1000包括壳体500及上述实施方式的深度相机400。深度相机400设置在壳体500内并从壳体500暴露以获取深度图像。电子装置1000包括但不限于为手机、平板电脑、笔记本电脑、智能手环、智能手表、智能头盔、智能眼镜等。壳体500可以给深度相机400提供防尘、防水、防摔等保护。
在本说明书的描述中，参考术语“某些实施方式”、“一个实施方式”、“一些实施方式”、“示意性实施方式”、“示例”、“具体示例”、或“一些示例”的描述意指结合所述实施方式或示例描述的具体特征、结构、材料或者特点包含于本申请的至少一个实施方式或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施方式或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施方式或示例中以合适的方式结合。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个所述特征。在本申请的描述中，“多个”的含义是至少两个，例如两个，三个，除非另有明确具体的限定。
尽管上面已经示出和描述了本申请的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本申请的限制，本领域的普通技术人员在本申请的范围内可以对上述实施例进行变化、修改、替换和变型，本申请的范围由权利要求及其等同物限定。

Claims (20)

  1. 一种衍射光学组件，其特征在于，包括：
    密封组件，所述密封组件包括透光的第一密封板、透光的第二密封板、和间隔物，所述第一密封板与所述第二密封板相对设置，所述间隔物间隔所述第一密封板和所述第二密封板，所述第一密封板、所述第二密封板及所述间隔物共同形成封闭的容置腔；和
    衍射光学元件，所述衍射光学元件收容在所述容置腔内，所述衍射光学元件包括透光的衍射本体及形成在所述衍射本体上的多个衍射结构。
  2. 根据权利要求1所述的衍射光学组件，其特征在于，所述第一密封板包括与所述第二密封板相对的第一抵触面，所述第二密封板包括与所述第一密封板相对的第二抵触面；
    所述衍射光学元件的数量为一个，所述衍射光学元件与所述第一抵触面及所述第二抵触面抵触；或者
    所述衍射光学元件的数量为至少两个，至少两个所述衍射光学元件中的两个所述衍射光学元件分别与所述第一抵触面及所述第二抵触面抵触。
  3. 根据权利要求2所述的衍射光学组件，其特征在于，所述衍射光学元件的数量为至少两个，相邻的两个所述衍射光学元件抵触；或
    相邻的两个所述衍射光学元件相互间隔。
  4. 根据权利要求1所述的衍射光学组件，其特征在于，所述衍射光学元件的数量为一个，所述衍射本体包括相背的衍射入射面与衍射出射面，所述衍射结构形成在所述衍射入射面或/和所述衍射出射面上；或
    所述衍射光学元件的数量为至少两个，每个所述衍射光学元件的衍射本体包括相背的衍射入射面与衍射出射面，每个所述衍射光学元件的衍射结构形成在对应的所述衍射入射面或/和所述衍射出射面上。
  5. 一种激光投射模组，其特征在于，所述激光投射模组包括：
    基板组件；
    镜筒组件，所述镜筒组件设置在所述基板组件上并与所述基板组件共同形成收容腔；
    光源，所述光源设置在所述基板组件上并收容在所述收容腔内；
    准直元件，所述准直元件收容在所述收容腔内；和
    衍射光学组件，所述衍射光学组件收容在所述收容腔内；
    所述衍射光学组件包括：
    密封组件，所述密封组件包括透光的第一密封板、透光的第二密封板、和间隔物，所述第一密封板与所述第二密封板相对设置，所述间隔物间隔所述第一密封板和所述第二密封板，所述第一密封板、所述第二密封板及所述间隔物共同形成封闭的容置腔；和
    衍射光学元件，所述衍射光学元件收容在所述容置腔内，所述衍射光学元件包括透光的衍射本体及形成在所述衍射本体上的多个衍射结构；
    所述准直元件、所述第一密封板、所述衍射光学元件及所述第二密封板依次设置在所述光源的光路上。
  6. 根据权利要求5所述的激光投射模组，其特征在于，所述第一密封板包括与所述第二密封板相对的第一抵触面，所述第二密封板包括与所述第一密封板相对的第二抵触面；
    所述衍射光学元件的数量为一个，所述衍射光学元件与所述第一抵触面及所述第二抵触面抵触；或者
    所述衍射光学元件的数量为至少两个，至少两个所述衍射光学元件中的两个所述衍射光学元件分别与所述第一抵触面及所述第二抵触面抵触。
  7. 根据权利要求6所述的激光投射模组，其特征在于，所述衍射光学元件的数量为至少两个，相邻的两个所述衍射光学元件抵触；或
    相邻的两个所述衍射光学元件相互间隔。
  8. 根据权利要求5所述的激光投射模组，其特征在于，所述衍射光学元件的数量为一个，所述衍射本体包括相背的衍射入射面与衍射出射面，所述衍射结构形成在所述衍射入射面或/和所述衍射出射面上；或
    所述衍射光学元件的数量为至少两个，每个所述衍射光学元件的衍射本体包括相背的衍射入射面与衍射出射面，每个所述衍射光学元件的衍射结构形成在对应的所述衍射入射面或/和所述衍射出射面上。
  9. 根据权利要求5所述的激光投射模组，其特征在于，所述光源为边发射激光器，所述光源包括发光面，所述发光面朝向所述准直元件。
  10. 根据权利要求9所述的激光投射模组，其特征在于，所述发光面与所述准直元件的准直光轴垂直。
  11. 根据权利要求9所述的激光投射模组，其特征在于，所述边发射激光器为分布反馈式激光器。
  12. 根据权利要求5所述的激光投射模组，其特征在于，所述光源为垂直腔面发 射激光器。
  13. 根据权利要求5所述的激光投射模组，其特征在于，所述镜筒组件包括镜筒，所述镜筒包括相背的顶部及底部，所述镜筒形成有贯穿所述顶部及所述底部的通孔，所述底部承载在所述基板组件上，所述镜筒的内壁向所述通孔的中心延伸有环形承载台，所述衍射光学组件承载在所述承载台上。
  14. 根据权利要求5所述的激光投射模组，其特征在于，所述基板组件包括电路板，所述光源及所述镜筒组件设置在所述电路板上。
  15. 根据权利要求5所述的激光投射模组，其特征在于，所述基板组件包括基板及承载在所述基板上的电路板，所述电路板开设有过孔，所述光源承载在所述基板上并收容在所述过孔内。
  16. 根据权利要求15所述的激光投射模组，其特征在于，所述基板开设有散热孔。
  17. 根据权利要求5所述的激光投射模组，其特征在于，所述准直元件包括一个或多个透镜，一个或多个所述透镜设置在所述光源的发光光路上。
  18. 根据权利要求17所述的激光投射模组，其特征在于，所述透镜由玻璃材质制成；或者所述透镜由塑料材质制成。
  19. 一种深度相机，其特征在于，所述深度相机包括：
    权利要求5-18任意一项所述的激光投射模组；
    图像采集器，所述图像采集器用于采集经所述衍射光学元件后向目标空间中投射的激光图案；和
    分别与所述激光投射模组、及所述图像采集器连接的处理器，所述处理器用于处理所述激光图案以获得深度图像。
  20. 一种电子装置，其特征在于，所述电子装置包括：
    壳体；和
    权利要求19所述的深度相机，所述深度相机设置在所述壳体上并从所述壳体上暴露以获取所述深度图像。
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