CN108508619A - Laser projection module, depth camera and electronic device - Google Patents
Laser projection module, depth camera and electronic device Download PDFInfo
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- CN108508619A CN108508619A CN201810200425.5A CN201810200425A CN108508619A CN 108508619 A CN108508619 A CN 108508619A CN 201810200425 A CN201810200425 A CN 201810200425A CN 108508619 A CN108508619 A CN 108508619A
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- lens
- light
- laser
- projection module
- light source
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
Abstract
The invention discloses a kind of laser projection module, depth camera and electronic devices.Laser projection module includes light source, collimating element and diffraction optical element.Light source is for emitting laser.Collimating element is used for collimation laser.Collimating element includes one or more lens, and one or more lens are arranged in the luminous light path of light source, and lens are made of plastic material.Diffraction optical element is for the laser after diffraction collimating element collimation to form laser pattern.In the laser projection module of embodiment of the present invention, depth camera and electronic device, the lens of collimating element are made of plastic material, and cost is relatively low, is convenient for volume production.
Description
Technical field
The present invention relates to technical field of imaging, more particularly to a kind of laser projection module, depth camera and electronic device.
Background technology
Laser projection module is by light source, collimating element and diffraction optical element (diffractive optical
Elements, DOE) composition.Lens arrangement has been generally comprised in collimating element, and lens are made of glass material, lead to laser
Project module cost it is higher, be not easy to volume production.
Invention content
A kind of laser projection module of embodiment of the present invention offer, depth camera and electronic device.
The laser projection module of embodiment of the present invention, including：
Light source, the light source is for emitting laser；
Collimating element, the collimating element include one or more lens for collimating the laser, the collimating element,
One or more lens are arranged in the luminous light path of the light source, and the lens are made of plastic material；And
Diffraction optical element, laser of the diffraction optical element for after collimating element collimation described in diffraction are sharp to be formed
Light pattern.
In some embodiments, the collimating element includes the first lens, and first lens include opposite first
Incidence surface and the first light-emitting surface, first incidence surface are concave surface, and first light-emitting surface is convex surface.
In some embodiments, the collimating element includes multiple lens, and multiple lens are coaxial to be successively set on
In the luminous light path of the light source.
In some embodiments, multiple lens include the first lens and the second lens, and first lens include
Opposite the first incidence surface and the first light-emitting surface, second lens include opposite the second incidence surface and the second light-emitting surface, institute
The vertex for stating the first light-emitting surface and the vertex of second incidence surface contradict, and first incidence surface is concave surface, and described second goes out
Smooth surface is convex surface.
In some embodiments, first light-emitting surface and second incidence surface are convex surface.
In some embodiments, multiple lens include the first lens, the second lens and the third lens, and described the
One lens include opposite the first incidence surface and the first light-emitting surface, and second lens include opposite the second incidence surface and second
Light-emitting surface, the third lens include opposite third incidence surface and third light-emitting surface, and the third incidence surface is concave surface, described
Third light-emitting surface is convex surface.
In some embodiments, first incidence surface is convex surface, and first light-emitting surface is concave surface, and described second enters
Smooth surface is concave surface, and second light-emitting surface is concave surface.
In some embodiments, the collimating element includes multiple lens, and multiple lens are successively set on described
In the luminous light path of light source, the light shaft offset of the optical axises of at least one lens relative to lens described in other.
In some embodiments, the collimating element includes multiple lens, and the optical center of at least two lens is located at
On the same plane vertical with first direction, the first direction is by the light source to the direction of the diffraction optical element.
In some embodiments, the optical axis of at least one lens is parallel with the optical axis of lens described in other.
In some embodiments, the light source is vertical cavity surface emitting laser；Or the light source swashs for edge emitting
Light device.
In some embodiments, the light source is edge-emitting laser, and the light source includes light-emitting surface, the light-emitting surface
Towards the collimating element.
The depth camera of embodiment of the present invention, including：
Laser projection module described in any of the above-described embodiment；
Image acquisition device, described image collector project after the diffraction optical element into object space for acquiring
Laser pattern；With
The processor being connect respectively with the laser projection module and described image collector, the processor is for locating
The laser pattern is managed to obtain depth image.
The electronic device of embodiment of the present invention, including：
Shell；And
Depth camera described in any of the above-described embodiment, the depth camera are arranged in the shell and from the shells
Body is exposed to obtain depth image.
In the laser projection module of embodiment of the present invention, depth camera and electronic device, the lens of collimating element by
Plastic material is made, and cost is relatively low, is convenient for volume production.
The additional aspect and advantage of embodiment of the present invention will be set forth in part in the description, partly will be from following
Become apparent in description, or practice through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention can be from the description in conjunction with following accompanying drawings to embodiment
It will be apparent and be readily appreciated that, wherein：
Fig. 1 is the structural schematic diagram of the laser projection module of certain embodiments of the present invention；
Fig. 2 to Fig. 4 is the part-structure schematic diagram of the laser projection module of certain embodiments of the present invention；
Fig. 5 to Figure 16 is the part-structure signal of the collimating element of the laser projection module of certain embodiments of the present invention
Figure；
Figure 17 is the structural schematic diagram of the depth camera of certain embodiments of the present invention；
Figure 18 is the structural schematic diagram of the electronic device of certain embodiments of the present invention；
Main element and symbol description：
Laser projection module 100, board unit 10, substrate 11, heat emission hole 111, circuit board 12, via 121, lens barrel 20,
Host cavity 21, bottom 23, through-hole 24, plummer 25, the first segment structure 26, the first segment structure 27, protective cover 30, supports top 22
Contacting surface 31, loophole 32, light source 40, light-emitting surface 41, side 42, collimating element 50, the first lens 51, the first incidence surface 511,
One light-emitting surface 512, the second lens 52, the second incidence surface 521, the second light-emitting surface 522, the third lens 53, third incidence surface 531,
Third light-emitting surface 532, the 5th lens 55, the 6th lens 56, diffraction optical element 60, diffraction exit facet 61, spreads out at the 4th lens 54
Penetrate the plane of incidence 62, sealing 70, supporting block 80, depth camera 400, projection window 401, acquisition window 402, image acquisition device 200,
Processor 300, electronic device 1000, shell 500.
Specific implementation mode
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein identical
Or similar label indicates same or similar element or element with the same or similar functions from beginning to end.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining embodiments of the present invention, and should not be understood as to this hair
The limitation of bright embodiment.
In the description of embodiments of the present invention, it is to be understood that term "center", " longitudinal direction ", " transverse direction ", " length
Degree ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner",
The orientation or positional relationship of the instructions such as "outside", " clockwise ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, only
It is embodiments of the present invention and simplified description for ease of description, does not indicate or imply the indicated device or element is necessary
With specific orientation, with specific azimuth configuration and operation, therefore should not be understood as the limitation to embodiments of the present invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance or implicit
Indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or impliedly wrap
Include one or more feature.In the description of embodiments of the present invention, the meaning of " plurality " is two or two
More than, unless otherwise specifically defined.
In the description of embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, term
" installation ", " connection ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, can also be to be electrically connected or can mutually communicate；Can be directly connected to, can also lead to
It crosses intermediary to be indirectly connected with, can be the interaction relationship of the connection or two elements inside two elements.For ability
For the those of ordinary skill in domain, it can understand that above-mentioned term in embodiments of the present invention specific contains as the case may be
Justice.
Following disclosure provides many different embodiments or example is used for realizing embodiments of the present invention not
Same structure.In order to simplify the disclosure of embodiments of the present invention, hereinafter the component of specific examples and setting are described.When
So, they are merely examples, and is not intended to limit the present invention.In addition, embodiments of the present invention can be in different examples
Repeat reference numerals and/or reference letter in son, this repetition are for purposes of simplicity and clarity, itself not indicate to be begged for
By the relationship between various embodiments and/or setting.In addition, the various specific techniques that embodiments of the present invention provide
With the example of material, but make those of ordinary skill in the art may realize that the application of other techniques and/or other materials
With.
Referring to Fig. 1, the laser projection module 100 of embodiment of the present invention includes board unit 10, lens barrel 20, protective cover
30, light source 40, collimating element 50 and diffraction optical element 60.
Board unit 10 includes the circuit board 12 of substrate 11 and carrying on the substrate 11.The material of substrate 11 can be modeling
Material, for example, polyethylene terephthalate (Polyethylene Glycol Terephthalate, PET), poly- methyl-prop
E pioic acid methyl ester (Polymethyl Methacrylate, PMMA), makrolon (Polycarbonate, PC), polyimides
Any one or more in (Polyimide, PI).In this way, the lighter weight of substrate 11 and have enough support strengths.Electricity
Road plate 12 can be hardboard, soft board or Rigid Flex.Via 121 is offered on circuit board 12.Light source 40 is solid by via 121
It is fixed to be electrically connected on the substrate 11 and with circuit board 12.Heat emission hole 111,12 work of light source 40 or circuit board can be offered on substrate 11
The heat for making to generate can be shed by heat emission hole 111, heat-conducting glue can also be filled in heat emission hole 111, to further increase substrate
The heat dissipation performance of component 10.
Lens barrel 20 is arranged on board unit 10 and host cavity 21 is collectively formed with board unit 10.Light source 40, collimation member
Part 50 and diffraction optical element 60 are housed in host cavity 21.Collimating element 50 is successively set on diffraction optical element 60
In the luminous light path of light source 40.Lens barrel 20 includes opposite top 22 and bottom 23.Lens barrel 20 is formed through top 22 and bottom
The through-hole 24 in portion 23.Bottom 23 is carried on board unit 10, can specifically be fixed on the circuit board 12 by glue.Lens barrel 20
Inner wall is extended with annular plummer 25 to the center of through-hole 24, and diffraction optical element 60 is carried on plummer 25.
Protective cover 30 is arranged on top 22, and protective cover 30 includes in host cavity 21 and the conflict opposite with substrate 11
Face 31.Protective cover 30 and plummer 25 contradict diffraction optical element 60 from the opposite both sides of diffraction optical element 60 respectively.It contradicts
Face 31 is the surface inconsistent with diffraction optical element 60 of protective cover 30.Laser projection module 100 is contradicted using protective cover 30
Diffraction optical element 60 is so that diffraction optical element 60 is housed in host cavity 21, and prevents diffraction optical element 60 along light extraction side
To falling off.
In some embodiments, protective cover 30 can be made of metal material, such as silver nanowire, metal silver wire, copper sheet
Deng.Protective cover 30 offers loophole 32.Loophole 32 is aligned with through-hole 24.Loophole 32 is for being emitted diffraction optical element 60
The laser pattern of projection.The pore size of loophole 32 be less than width or at least one of length of diffraction optical element 60 with
Diffraction optical element 60 is limited in host cavity 21.
In some embodiments, protective cover 30 can be made of translucent material, such as glass, polymethyl methacrylate
(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 30 can not have to open
If loophole 32.In this way, protective cover 30 can avoid diffraction optical element 60 while preventing diffraction optical element 60 from falling off
It is exposed in the outside of lens barrel 20, play the role of waterproof and dustproof to diffraction optical element 60.
Light source 40 is for emitting laser.Light source 40 can be vertical cavity surface emitting laser (Vertical Cavity
Surface Emitting Laser, VCSEL) or edge-emitting laser (edge-emitting laser, EEL).Such as scheming
In embodiment shown in 1, light source 40 is edge-emitting laser, and specifically, light source 40 can be distributed feedback laser
(Distributed Feedback Laser, DFB).Light source 40 into host cavity 21 for emitting laser.Incorporated by reference to Fig. 2, light
Source 40 is whole to be in the form of a column, and an end face of the light source 40 far from board unit 10 forms light-emitting surface 41, and laser is sent out from light-emitting surface 41,
Light-emitting surface 41 towards collimating element 50 and light-emitting surface 41 it is vertical with the collimation optical axis of collimating element 50, collimation optical axis pass through light-emitting surface
51 center.Light source 40 is fixed on board unit 10, and specifically, light source 40 can be bonded in board unit 10 by sealing 70
On, such as the opposite with light-emitting surface 41 of light source 40 be bonded on one side on board unit 10.Incorporated by reference to Fig. 1 and Fig. 3, light source 40
Side 42 can also be bonded on board unit 10, and sealing 70 wraps the side 42 of surrounding, can also only bond side 42
Some face and board unit 10 or certain several face of bonding and board unit 10.Sealing at this time 70 can be heat-conducting glue, by light
The heat that the work of source 40 generates is conducted into board unit 10.
The light source 40 of above-mentioned laser projection module 100 use edge-emitting laser, one side edge-emitting laser compared with
The temperature drift of VCSEL array is smaller, on the other hand, since edge-emitting laser is single-point light emitting structure, is not necessarily to array of designs structure,
It makes simply, 40 cost of light source of laser projection module 100 is relatively low.
The laser of distributed feedback laser obtains the gain of power by the feedback of optical grating construction when propagating.It carries
The power of high distributed feedback laser is needed by increasing Injection Current and/or increasing the length of distributed feedback laser,
Since increase Injection Current can make the power consumption of distributed feedback laser increase and serious problem of generating heat occurs,
In order to ensure that distributed feedback laser can work normally, the length for increasing distributed feedback laser is needed, causes to be distributed
Feedback laser is generally in elongate strip structure.When the light-emitting surface 41 of edge-emitting laser is towards collimating element 50, edge emitting
Laser is placed in vertical, since edge-emitting laser is in elongate strip structure, edge-emitting laser be susceptible to fall, shift or
Shaking etc. is unexpected, therefore can be fixed edge-emitting laser by the way that sealing 70 is arranged, and prevents edge-emitting laser from falling
Fall, displacement or shaking etc. it is unexpected.
In some embodiments, light source 40 can also be fixed on board unit 10 using fixed form as shown in Figure 4
On.Specifically, laser projection module 100 includes multiple supporting blocks 80, and supporting block 80 can be fixed on board unit 10, multiple
Light source 40, can be directly installed between multiple supporting blocks 80 by 80 common ambient light source 40 of supporting block when mounted.At one
In example, light source 40 is clamped in multiple supporting blocks 80 jointly, to further prevent light source 40 to shake.
Collimating element 50 is used for the laser that collimated light source 40 emits.Collimating element 50 is fixed on lens barrel 20, plummer 25
Between collimating element 50 and diffraction optical element 60.Collimating element 50 includes one or more lens, one or more saturating
Mirror is arranged in the luminous light path of light source 40, and lens are made of plastic material.Due to the collimating element of embodiment of the present invention
50 lens are made of plastic material, and cost is relatively low, is convenient for volume production.
Also referring to Fig. 1 and Fig. 5, in some embodiments, collimating element 50 can only include the first lens 51, and first
Lens 51 include the first incidence surface 511 and the first light-emitting surface 512 opposite to each other.First incidence surface 511 is that the first lens 51 lean on dipped beam
The surface in source 40, the first light-emitting surface 512 are the first lens 51 close to the surface of diffraction optical element 60.First incidence surface 511 is
Concave surface, the first light-emitting surface 512 are convex surface.The face type of first lens 51 can be aspherical, spherical surface, Fresnel surface or binary optical
Face.Diaphragm is arranged between light source 40 and the first lens 51, for providing constraints to light beam.
In some embodiments, collimating element 50 may include multiple lens, and multiple lens are coaxial to be successively set on light source
In 40 luminous light path.The face type of each lens can be any one in aspherical, spherical surface, Fresnel surface, binary optical face
Kind.
Such as：Also referring to Fig. 1 and Fig. 6, multiple lens may include the first lens 51 and the second lens 52.First lens
51 and second lens 52 coaxial be successively set in the luminous light path of light source 40.First lens 51 include the first incidence surface opposite to each other
511 and first light-emitting surface 512.First incidence surface 511 is the surface that the first lens 51 lean on close to sources 40, and the first light-emitting surface 512 is
First lens 51 are close to the surface of diffraction optical element 60.Second lens 52 include that opposite the second incidence surface 521 and second goes out
Smooth surface 522.Second incidence surface 521 is the surface that the second lens 52 lean on close to sources 40, and the second light-emitting surface 522 is that the second lens 52 lean on
The surface of nearly diffraction optical element 60.The vertex of first light-emitting surface 512 and the vertex of the second incidence surface 521 contradict, and first enters light
Face 511 is concave surface, and the second light-emitting surface 522 is convex surface.Diaphragm is arranged on the second incidence surface 521, makees for playing limitation to light beam
With.Further, the first light-emitting surface 512 and the second incidence surface 521 can be convex surface.In this way, convenient for the top of the first light-emitting surface 512
The vertex of point and the second incidence surface 521 contradicts.The radius of curvature of first light-emitting surface 512 is less than the curvature of the second incidence surface 521.
Also referring to Fig. 1 and Fig. 7, multiple lens may also include the first lens 51, the second lens 52 and the third lens
53.First lens 51, the second lens 52 and the third lens 53 are coaxial is successively set in the luminous light path of light source 40.First thoroughly
Mirror 51 includes the first incidence surface 511 and the first light-emitting surface 512 opposite to each other.First incidence surface 511 is that the first lens 51 lean on close to sources
40 surface, the first light-emitting surface 512 are the first lens 51 close to the surface of diffraction optical element 60.Second lens 52 include opposite
The second incidence surface 521 and the second light-emitting surface 522.Second incidence surface 521 be the second lens 52 lean on close to sources 40 surface, second
Light-emitting surface 522 is the second lens 52 close to the surface of diffraction optical element 60.The third lens 53 include opposite third incidence surface
531 and third light-emitting surface 532.Third incidence surface 531 is the surface that the third lens 53 lean on close to sources 40, and third light-emitting surface 532 is
The third lens 53 are close to the surface of diffraction optical element 60.Third incidence surface 531 is concave surface, and third light-emitting surface 532 is convex surface.Light
Door screen is arranged on third light-emitting surface 532, for providing constraints to light beam.Further, the first incidence surface 511 can be convex surface,
First light-emitting surface 512 is concave surface, and the second incidence surface 521 is concave surface, and the second light-emitting surface 522 is concave surface.
In some embodiments, collimating element 50 includes multiple lens.Multiple lens are successively set on the hair of light source 40
In light light path, the light shaft offset of the optical axises of at least one lens relative to other lenses.At this point, the structure of lens barrel 20 can be in one section
Or multi-segment structure, per segment structure for installing corresponding lens.
Such as：Also referring to Fig. 8 to Figure 12, collimating element 50 includes that the first lens 51, the second lens 52 and third are saturating
Mirror 53.First lens 51, the second lens 52 and the third lens 53 are successively set in the luminous light path of light source 40.Second lens 52
Light shaft offset of the optical axis relative to the first lens 51, the optical axis of the first lens 51 and optical axis coincidence (such as Fig. 8 of the third lens 53
It is shown), further, the optical axis of the second lens 52 can be parallel with the optical axis of the first lens 51, at this point, the structure of lens barrel 20 can be in
Two-stage structure, the first segment structure 26 is for installing the first lens 51 and the second lens 52, and the second segment structure 27 is for installing third
Lens 53,27 ramp interface of the first segment structure 26 and the second segment structure, the second lens 52 are mounted on the first segment structure 26 and second
The joint of segment structure 27, in this way, the structure of multiple lens forming bents is conducive to increase light path, to reduce laser projection
The inner wall of the whole height of module 100, the first segment structure 26 and the second segment structure 27 is coated with reflectance coating, and reflectance coating is used for
Reflection light, so that the light that light source 40 emits can enter by the first incidence surface 511, the first light-emitting surface 512, second successively
Smooth surface 521, the second light-emitting surface 522, third incidence surface 531 and third light-emitting surface 532；Certainly, in other embodiments,
First segment structure 26 and the second segment structure 27 are alternatively the reflecting element independently of lens barrel 20, and reflecting element is arranged in lens barrel 20
On, reflecting element is prism or face mirror etc., and reflecting element is for reflection light to change the direction of light path；Alternatively, the first lens
Light shaft offset of 51 optical axis relative to the second lens 52, the optical axis of the second lens 52 and the optical axis coincidence of the third lens 53 are (such as
Shown in Fig. 9), further, the optical axis of the first lens 51 can be parallel with the optical axis of the second lens 52；Alternatively, the third lens 53
Light shaft offset of the optical axis relative to the first lens 51, optical axis coincidence (such as Figure 10 of the optical axis of the first lens 51 and the second lens 52
It is shown), further, the optical axis of the third lens 53 can be parallel with the optical axis of the first lens 51；Alternatively, the optical axis of the second lens 52
Relative to the light shaft offset of the first lens 51, the light shaft offset of the optical axises of the third lens 53 relative to the first lens 51, second thoroughly
The optical axis of mirror 52 and the optical axis of the third lens 53 are located at the homonymy (as shown in figure 11) of the optical axis of the first lens 51, further,
The optical axis of first lens 51 can be parallel with the optical axis of the second lens 52, and the optical axis of the first lens 51 is flat with the optical axis of the third lens 53
Row, the optical axis of the second lens 52 are parallel with the optical axis of the third lens 53；Alternatively, the optical axis of the second lens 52 is relative to the first lens
51 light shaft offset, the light shaft offset of the optical axises of the third lens 53 relative to the first lens 51, the optical axis of the second lens 52 and
The optical axis of three lens 53 is located at the heteropleural (as shown in figure 12) of the optical axis of the first lens 51, further, the light of the first lens 51
Axis can be parallel with the optical axis of the second lens 52, and the optical axis of the first lens 51 is parallel with the optical axis of the third lens 53, the second lens 52
Optical axis it is parallel with the optical axis of the third lens 53.
Preferably, light shaft offset of the optical axis of the second lens 52 relative to the first lens 51, the optical axis phase of the third lens 53
For the light shaft offset of the first lens 51, the optical axis of the second lens 52 and the optical axis of the third lens 53 are located at the light of the first lens 51
The heteropleural of axis.In this way, the structure of multiple lens forming bents is conducive to increase light path, increase focal length, reduces laser projection mould
The height of group 100.Certainly, collimating element 50 can also include more lens, for example, please referring to Fig.1 3, collimating element 50 wraps
Include the first lens 51, the second lens 52, the third lens 53, the 4th lens 54, the 5th lens 55 and the 6th lens 56.First thoroughly
Mirror 51, the second lens 52, the third lens 53, the 4th lens 54, the 5th lens 55 and the 6th lens 56 are successively set on light source 40
Luminous light path on.Light shaft offset of the optical axis of second lens 52 relative to the first lens 51, the optical axis of the third lens 53 are opposite
In the light shaft offset of the first lens 51, the optical axis of the second lens 52 and the optical axis of the third lens 53 are located at the optical axis of the first lens 51
Heteropleural, the optical axis coincidence of the optical axis of the 4th lens 54 and the second lens 52, the optical axises of the 5th lens 55 and the third lens 53
Optical axis coincidence, the optical axis coincidence of the optical axis of the 6th lens 56 and the first lens 51.
It should be pointed out that in the laser projection module 100 shown in Fig. 9 to Figure 13, shown in the structure and Fig. 8 of lens barrel 20
Lens barrel 20 structure it is same or like, the structure of lens barrel 20 can be in one or more snippets structure, and details are not described herein.
In some embodiments, collimating element 50 includes multiple lens, and the optical center of at least two lens is located at and first
On the vertical same plane in direction, first direction is by light source 40 to the direction of diffraction optical element 60.
Such as：Also referring to Figure 14 to Figure 16, collimating element 50 includes that the first lens 51, the second lens 52 and third are saturating
Mirror 53.The optical center of the optical center of first lens 51 and the second lens 52 is in the same plane (as shown in figure 14), the first lens 51
Optical axis and the second lens 52 optical axis can be located at the third lens 53 optical axis heteropleural；Alternatively, the optical center of the second lens 52 with
The optical center of the third lens 53 is in the same plane (as shown in figure 15), the optical axis of the optical axis and the third lens 53 of the second lens 52
The heteropleural of the optical axis of the first lens 51 can be located at；Alternatively, the optical center of the first lens 51 and the optical center of the third lens 53 are positioned at same
In plane；Alternatively, the optical center of the optical center of the first lens 51, the second lens 52 and the optical center of the third lens 53 are respectively positioned on same put down
On face (as shown in figure 16).Further, the optical axis of the first lens 51 can be parallel with the optical axis of the second lens 52, the first lens 51
Optical axis it is parallel with the optical axis of the third lens 53, the optical axis of the second lens 52 is parallel with the optical axis of the third lens 53.
Referring to Fig. 1, diffraction optical element 60 is for the laser after the collimation of diffraction collimating element 50 to form laser
Pattern.Diffraction optical element 60 includes opposite diffraction exit facet 61 and the diffraction plane of incidence 62.Protective cover 30 can pass through glue
It is pasted onto on top 22, resistance surface 31 is contradicted with diffraction exit facet 61, and the diffraction plane of incidence 62 is contradicted with plummer 25, to diffraction
Optical element 60 will not fall off along light direction from host cavity 21.Diffraction optical element 60 can be made of glass material, also may be used
To be made of composite plastic (such as PET).
When assembling above-mentioned laser projection module 100, along light path from the bottom of lens barrel 20 23 successively into through-hole 24
It is put into collimating element 50 and installs the board unit 10 of light source 40.Light source 40 can be first mounted on board unit 10, then
The board unit 10 for being equipped with light source 40 is fixed with bottom 23 again.Against light path direction from top 22 by diffraction optical element
60 are put into through-hole 24 and are carried on plummer 25, then install protective cover 30 again, and make the diffraction of diffraction optical element 60
Exit facet 61 is contradicted with protective cover 30, and the diffraction plane of incidence 62 is contradicted with plummer 25.Laser projection module 100 is simple in structure, group
Dress is convenient.
7 are please referred to Fig.1, the depth camera 400 of embodiment of the present invention includes the laser projection of any of the above-described embodiment
Module 100, image acquisition device 200 and processor 300.Image acquisition device 200 is for acquiring after diffraction optical element 50 to mesh
The laser pattern projected in mark space.Processor 300 is connect with laser projection module 100 and image acquisition device 200 respectively.Place
Reason device 300 is for handling laser pattern to obtain depth image.
Specifically, laser projection module 100 projects the laser figure projected into object space outward by projecting window 401
Case, image acquisition device 200 are acquired by acquisition window 402 by the modulated laser pattern of target object.Image acquisition device 200 can
For infrared camera, processor 300 is calculated in the laser pattern using image matching algorithm in each pixel and reference pattern
The deviation value of corresponding each pixel, the depth image of the laser pattern is further obtained further according to the deviation value.Wherein, image
Matching algorithm can be related (Digital Image Correlation, the DIC) algorithm of digital picture.It is of course also possible to use its
Its image matching algorithm replaces DIC algorithms.
In the depth camera 400 of embodiment of the present invention, the lens of collimating element 50 are made of plastic material, cost compared with
It is low, be convenient for volume production.
8 are please referred to Fig.1, the electronic device 1000 of embodiment of the present invention includes the depth of shell 500 and the above embodiment
Spend camera 400.The setting of depth camera 400 exposes in shell 500 and from shell 500 to obtain depth image.Electronic device
1000 include but not limited to for mobile phone, tablet computer, laptop, Intelligent bracelet, smartwatch, intelligent helmet, Brilliant Eyes
Mirror etc..
In the electronic device 1000 of embodiment of the present invention, the lens of collimating element 50 are made of plastic material, cost
It is relatively low, be convenient for volume production.
In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically implementation
The description of mode ", " example ", " specific example " or " some examples " etc. means the tool described in conjunction with the embodiment or example
Body characteristics, structure, material or feature 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, the specific features of description, knot
Structure, material or feature can be combined in any suitable manner in any one or more embodiments or example.
Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiment is
Illustratively, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be right
The above embodiment is changed, changes, replacing and modification.
Claims (14)
1. a kind of laser projection module, which is characterized in that including：
Light source, the light source is for emitting laser；
Collimating element, the collimating element is for collimating the laser, and the collimating element includes one or more lens, one
Or multiple lens are arranged in the luminous light path of the light source, the lens are made of plastic material；And
Diffraction optical element, the diffraction optical element is for the laser after collimating element collimation described in diffraction to form laser figure
Case.
2. laser projection module according to claim 1, which is characterized in that the collimating element includes the first lens, institute
The first incidence surface and the first light-emitting surface that the first lens include opposite are stated, first incidence surface is concave surface, first light extraction
Face is convex surface.
3. laser projection module according to claim 1, which is characterized in that the collimating element includes multiple lens, more
A lens are coaxial to be successively set in the luminous light path of the light source.
4. laser projection module according to claim 3, which is characterized in that multiple lens include the first lens and the
Two lens, first lens include opposite the first incidence surface and the first light-emitting surface, and second lens include opposite
Two incidence surfaces and the second light-emitting surface, the vertex of first light-emitting surface and the vertex of second incidence surface contradict, and described first
Incidence surface is concave surface, and second light-emitting surface is convex surface.
5. laser projection module according to claim 4, which is characterized in that first light-emitting surface and described second enters light
Face is convex surface.
6. laser projection module according to claim 3, which is characterized in that multiple lens include the first lens, the
Two lens and the third lens, first lens include opposite the first incidence surface and the first light-emitting surface, the second lens packet
Including opposite the second incidence surface and the second light-emitting surface, the third lens include opposite third incidence surface and third light-emitting surface,
The third incidence surface is concave surface, and the third light-emitting surface is convex surface.
7. laser projection module according to claim 6, which is characterized in that first incidence surface is convex surface, described the
One light-emitting surface is concave surface, and second incidence surface is concave surface, and second light-emitting surface is concave surface.
8. laser projection module according to claim 1, which is characterized in that the collimating element includes multiple lens, more
A lens are successively set in the luminous light path of the light source, and the optical axis of at least one lens is relative to described in other
The light shaft offset of lens.
9. laser projection module according to claim 1, which is characterized in that the collimating element includes multiple lens, until
The optical center of few two lens is located on the same plane vertical with first direction, the first direction for by the light source extremely
The direction of the diffraction optical element.
10. laser projection module according to claim 8 or claim 9, which is characterized in that the optical axis of at least one lens with
The optical axis of other lens is parallel.
11. laser projection module according to claim 1, which is characterized in that the light source is vertical cavity surface-emitting laser
Device；Or the light source is edge-emitting laser.
12. laser projection module according to claim 1, which is characterized in that the light source is edge-emitting laser, described
Light source includes light-emitting surface, and the light-emitting surface is towards the collimating element.
13. a kind of depth camera, which is characterized in that including：
Laser projection module described in claim 1-12 any one；
Image acquisition device, described image collector be used to acquire projected into object space after the diffraction optical element it is sharp
Light pattern；With
The processor being connect respectively with the laser projection module and described image collector, the processor is for handling institute
Laser pattern is stated to obtain depth image.
14. a kind of electronic device, which is characterized in that including：
Shell；And
Depth camera described in claim 13, the depth camera are arranged in the shell and are exposed from the shell to obtain
Take depth image.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810200425.5A CN108508619B (en) | 2018-03-12 | 2018-03-12 | Laser projection module, depth camera and electronic device |
| US16/467,145 US10962870B2 (en) | 2018-03-12 | 2019-02-18 | Laser projection unit, depth camera and electronic device |
| PCT/CN2019/075377 WO2019174433A1 (en) | 2018-03-12 | 2019-02-18 | Laser projection module, depth camera, and electronic device |
| EP19725917.9A EP3567426B1 (en) | 2018-03-12 | 2019-02-18 | Laser projection module, depth camera, and electronic device |
| TW108108331A TWI683138B (en) | 2018-03-12 | 2019-03-12 | Laser projection module, depth camera and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810200425.5A CN108508619B (en) | 2018-03-12 | 2018-03-12 | Laser projection module, depth camera and electronic device |
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| Publication Number | Publication Date |
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| CN108508619A true CN108508619A (en) | 2018-09-07 |
| CN108508619B CN108508619B (en) | 2020-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810200425.5A Active CN108508619B (en) | 2018-03-12 | 2018-03-12 | Laser projection module, depth camera and electronic device |
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Cited By (1)
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|---|---|---|---|---|
| WO2019174433A1 (en) * | 2018-03-12 | 2019-09-19 | Oppo广东移动通信有限公司 | Laser projection module, depth camera, and electronic device |
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|---|---|
| CN108508619B (en) | 2020-01-10 |
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