CN109579728A - Pattern light projective module group based on holographical wave guide - Google Patents
Pattern light projective module group based on holographical wave guide Download PDFInfo
- Publication number
- CN109579728A CN109579728A CN201811294220.4A CN201811294220A CN109579728A CN 109579728 A CN109579728 A CN 109579728A CN 201811294220 A CN201811294220 A CN 201811294220A CN 109579728 A CN109579728 A CN 109579728A
- Authority
- CN
- China
- Prior art keywords
- hoe
- wave guide
- waveguide
- module group
- holographic optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- G01B11/254—Projection of a pattern, viewing through a pattern, e.g. moiré
-
- 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
- G02B27/48—Laser speckle optics
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The present invention relates to 3D topography measurement fields.The present invention provides a kind of pattern light projective module group based on holographical wave guide, including holographical wave guide unit, array laser light source, collimation lens and diffraction optical element, and wherein holographical wave guide unit is made of holographic optical elements (HOE) and waveguide base material.Holographic optical elements (HOE) is as coupling input and output modulator part, the first speckle patterns that it issues array laser light source are modulated to intrabasement total reflection waveguide transmission, and coupling is exported to collimation lens after a certain distance, diffraction optical element receives collimated light beam and illuminates highdensity speckle dot matrix is formed after the duplication extension of the first speckle patterns, projection to scene to be measured.Laser array light source and other optical modulating devices can be spatially separated a certain distance by using the mode of holographical wave guide transmission, in order to increase radiator for light source, guarantee good heat dissipation characteristics while realization structure frivolous Miniaturization Design.
Description
Technical field
The present invention relates to 3D topography measurement fields, more particularly to a kind of pattern light projective module based on holographical wave guide
Group.
Background technique
3D topography can acquire the depth coordinate information of object in scene, provide additional data for rear end exploitation
Handle freedom degree.Universal with mobile terminal device and intelligent interaction device, 3D measuring technique increasingly becomes people of new generation
Machine interaction core technology, industrial detection, security protection retail, somatic sensation television game, mobile payment and in terms of suffer from
Broad application prospect.
Pattern light technology is the 3D data acquisition plan being currently widely used.It is using random, pseudorandom after coding
Or the spot light cluster of regular array is projected to spatial scene as optical probe, by comparing spot shift amount, is surveyed by triangle
Amount principle obtains specific depth information of scene.Preset structure optical mode is projected to actual scene by projective module group, is speckle
The hardware foundation of structure light depth camera.Usual mould group includes laser light source, collimation lens and diffraction optical element
(Diffractive Optical Element, DOE).
As application of the depth perception technology in terms of mobile device is further extensive, therefore for projective module group and depth phase
The volume size requirements of machine are higher and higher.Compact-sized frivolous projective module group and depth camera become research urgent in field
Demand；In addition, it is all more compact by the installation of each element in the inner and arrangement in the projective module group of miniaturization, lead to it again
The problem of light source heat radiation can be faced, seriously constrains the development of speckle projection mould group.
In summary, in pattern light 3D topography measurement, how to design structure it is frivolous miniaturization and again convenient for into
The speckle projection mould group of line light source heat dissipation becomes current one of the technical problems that are urgent to solve.
Summary of the invention
The purpose of the embodiment of the present invention is that a kind of pattern light projective module group based on holographical wave guide is provided, so that speckle
Projective module group can also have good heat dissipation characteristics while meeting structure frivolous Miniaturization Design.
To achieve the goals above, on the one hand the embodiment of the present invention provides a kind of pattern light throwing based on holographical wave guide
Shadow mould group, the array light source of the laser beam including holographical wave guide unit and for emitting corresponding first speckle patterns, wherein institute
Stating holographical wave guide unit includes waveguide-based bottom, the first holographic optical elements (HOE) and the second holographic optical elements (HOE), first holographic optical
The first end that element fits in the waveguide-based bottom is learned, second holographic optical elements (HOE) fits in the second of the waveguide-based bottom
End；Wherein, second holographic optical elements (HOE) is used to access to the laser beam coupling that the array light source is emitted described
Waveguide-based bottom, the laser beam can carry out waveguide transmission in the waveguide-based bottom, and pass through first holographic optics
Element output.
On the other hand the embodiment of the present invention provides a kind of pattern light projective module group based on holographical wave guide, including holography
The array light source of Wave guide unit and the laser beam for emitting corresponding first speckle patterns, wherein the holographical wave guide unit packet
Waveguide-based bottom and the first holographic optical elements (HOE) are included, first holographic optical elements (HOE) fits in the first end at the waveguide-based bottom；
Wherein, plane of the waveguide-based bottom at the second end is cut into inclined surface, to be coupled by the inclined surface wait hold
The laser beam of row waveguide transmission so that the laser beam can carry out waveguide transmission in the waveguide-based bottom, and leads to
Cross the first holographic optical elements (HOE) output.
Through the above technical solutions, proposing, holographical wave guide unit and array light are set in pattern light projective module group
Source, holographical wave guide unit includes waveguide-based bottom, the first holographic optical elements (HOE) and the second holographic optical elements (HOE), in location arrangements side
Face, the laser beam that satisfaction is issued by array light source are coupled into through second holographic optical elements (HOE) of one end and can be in waveguide-based bottoms
Waveguide transmission is carried out by the first holographic optical elements (HOE) output in the waveguide-based bottom other end.It as a result, can by waveguide transmission
Light source is separated into relatively long distance with other optical modulating devices, and can also allow individually to increase radiator for light source, in reality
There can also be very good heat dissipation characteristics while existing structure frivolous Miniaturization Design.
The other feature and advantage of the embodiment of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
Attached drawing is to further understand for providing to the embodiment of the present invention, and constitute part of specification, under
The specific embodiment in face is used to explain the present invention embodiment together, but does not constitute the limitation to the embodiment of the present invention.Attached
In figure:
Fig. 1 is the structural principle signal of the pattern light projective module group based on holographical wave guide of one embodiment of the invention
Figure；
Fig. 2 is the structural schematic diagram of the pattern light projective module group based on holographical wave guide of first embodiment of the invention；
Fig. 3 is that the pattern light based on holographical wave guide configured with hololens decoupling of second embodiment of the invention is thrown
The principle schematic diagram of shadow mould group；
Fig. 4 is the pattern light based on holographical wave guide configured with compound HOE decoupling of third embodiment of the invention
The principle schematic diagram of projective module group；
Fig. 5 is being coupled into holographic grating decoupling configured with hololens based on holographical wave guide for fourth embodiment of the invention
Pattern light projective module group principle schematic diagram；
Fig. 6 A is the pattern based on holographical wave guide configured with inclined surface coupling input of first embodiment of the invention
The principle schematic diagram of light projective module group；
Fig. 6 B is the pattern based on holographical wave guide configured with inclined surface coupling input of second embodiment of the invention
The principle schematic diagram of light projective module group；
Fig. 6 C is the pattern based on holographical wave guide configured with inclined surface coupling input of third embodiment of the invention
The principle schematic diagram of light projective module group.
Specific embodiment
It is described in detail below in conjunction with specific embodiment of the attached drawing to the embodiment of the present invention.It should be understood that this
Locate described specific embodiment and be merely to illustrate and explain the present invention embodiment, is not intended to restrict the invention embodiment.
As shown in Figure 1, the pattern light projective module group based on holographical wave guide of one embodiment of the invention, including array light
Source 11 and holographical wave guide unit 20, wherein the array light source 11 can emit the laser beam of corresponding first speckle patterns, holographic
Wave guide unit 20 includes waveguide-based bottom 13, the first holographic optical elements (HOE) 201 and the second holographic optical elements (HOE) 202, the first holographic optical
The first end that element 201 fits in waveguide-based bottom 13 is learned, the second holographic optical elements (HOE) 202 fits in the second of waveguide-based bottom 13
End, and array light source 11 is set to the top of the second end at waveguide-based bottom 13, and the laser light issued by array light source 11
Beam can via the second holographic optical elements (HOE) 202 couple access waveguide-based bottom 13, laser beam can in waveguide-based bottom 13 into
Row waveguide transmission, and exported by the first holographic optical elements (HOE) 201；Although Fig. 1, which is shown, is set to waveguide-based for array light source
The example of the top of the second end at bottom, but it is understood that, by array light source setting in other positions, such as waveguide-based bottom
The positions such as lower section are also to allow, and can be the design according to system structure and flexible modulation.
It should be noted that holographical wave guide (Holographic Waveguide, HW) is using holographic optical elements (HOE)
(Holographic Optical Element, HOE) be used as coupling input or output device, by light control glass or its
A kind of integrated optics technique of waveguide transmission is carried out in his optical medium.Wherein HOE is to use holographic interference methods processing and fabricating
Made of optical component, can also be required be fabricated to the form of holographic grating or hololens according to coupling function, be fitted in
The surface of glass or other optical mediums.Waveguide transmission is light in the medium with total reflection (Total Internal
Reflection, TIR) mode modulate conduction optical signal a kind of mode, making in this way can be expeditiously by optics
The light shaft offset of system input and output end.
In addition, correspondence the first speckle patterns pattern for needing to export array light source by pattern light projective module group
Light be modulated, such as collimation modulation and optical grating diffraction processing, the speckle for meeting expectation and demand can be exported.Scheming
The first holographic optical elements (HOE) 201 in 1 pattern light projective module group realizes the decoupling by light in waveguide-based bottom, and
Second holographic optical elements (HOE) 202 realizes being coupled into waveguide-based bottom by light, to carry out waveguide transmission in waveguide-based bottom.It needs
Illustrate, can also be additional in the pattern light projective module group of Fig. 1 and other Light modulation elements are set, with realization pair
Light modulation element can be preferably arranged far from the second end of light source by the modulation of light beam at this time, that is, close to the first optics
The position of element 201, to realize outstanding heat dissipation performance, detail will be also unfolded in other embodiments below.?
In the embodiment of the present invention, by introducing holographical wave guide unit 20, light source and other optics member are arranged using the characteristic of light shaft offset
Part will not increase the volume of module while realizing heat sinking function, ensure the frivolous of its structure and miniaturization, Neng Gouguang
It is general and be preferably employed in electronic equipment.
Although the first holographic optical elements (HOE) 201 is bonded shown in Fig. 1 first end and the second holographic optical elements (HOE)
202 second ends that are bonded are waveguide-based bottom is arranged in ipsilateral, but it is understood that, it can also be according to the design needs
First holographic optical elements (HOE) 201 and the second holographic optical elements (HOE) 202 are arranged in the heteropleural at waveguide-based bottom；It should also be noted that
Array light source side is also required for the coupling modulation of holographic optical elements (HOE), to form waveguide transmission, if not having to holographic optical elements (HOE)
Coupling then can be waveguide-based undercutting being cut into inclined-plane.It is understood that the first holographic optical elements (HOE) 201 and second is holographic
The type selecting of optical element 202 be also possible to it is diversified, such as the two can be using transmission-type holographic optical elements (HOE) and/
Or reflecting HOE；Allow neatly arranging system component, as a result, to realize expected heat dissipation effect.
Although what Fig. 1 was provided is the projective module group designed using transmission-type HOE, but it is understood that, the present invention is implemented
Mould group in example can still use reflecting HOE HOE, and correspondingly also only need the module position of adjustment mould group
?.
In order to ensure light good waveguide transmission effect in waveguide-based bottom, it can be and enable laser beam at waveguide-based bottom
Being transmitted according to preset light propagation angle in 13, to meet total reflection condition, it may be assumed that
Wherein,For preset light propagation angle,For the angle of total reflection, n is the light refractive index at waveguide-based bottom.
As shown in Fig. 2, the pattern light projective module group based on holographical wave guide of another embodiment of the present invention, wherein by portion
On the other end for the waveguide matrix that light splitting modulation element is arranged far from light source, good heat dissipation performance is realized.Specifically, base
It include array light source 11 in the pattern light projective module group of holographical wave guide, it, which is arranged, is designed to the point source array that shines, and is used for
The illumination of preset first speckle patterns, 12 form is provided, can be using vertical cavity surface laser emitter (Vertical
Cavity Surface Emitting Lasers, VCSEL), and it is set to the array light of two-dimentional rule or random arrangement
Source, the high wavelength window of the infrared light or other efficiencies of transmission that wavelength is 940nm；13 be waveguide-based bottom, is n's by refractive index
Glass or other optical medium materials are made；142 be coupling output HOE (Holographic Optical Element, holography
Optical element), in addition, the mould group can also include coupling input HOE141, coupling element HOE is only a tunic system, therefore its
Volume is frivolous to be convenient for Miniaturization Design；15 be collimation lens, and the beam modulation for issuing holographical wave guide is after collimated light beam
It projects, simple lens, compound lens, microlens array or Fresnel Lenses can be used to realize；16 be diffraction optical element
DOE for receiving the first speckle patterns 12, and replicates and is extended to the second speckle patterns, form the speckle light cluster of large area array, throws
Shadow is into practical scene to be measured；17 be object scene to be measured；18 the second final speckle patterns being projected out for mould group, to realize
Second speckle patterns are projected to object scene to be measured.In the present embodiment, by waveguide transmission by light source and other optics tune
Device isolation certain distance processed can individually increase radiator for light source, this is very beneficial for as system integral heat sink.
It should be noted that collimation lens 15 can also be placed on before coupling input HOE 141, sent out with coupling array light source
The laser beam penetrated, and row waveguide transmission will be coupled into again after source light beam collimation.Furthermore it is possible to be set according to specific system
The position of meter scheme flexible choice collimation lens 15 and focal length make its matching complete alignment function.
As shown in figure 3, the pattern light projective module group based on holographical wave guide of another embodiment of the present invention comprising battle array
Column light source 11, it, which is arranged, is designed to the point source array that shines, for providing the illumination of preset first speckle patterns, 12 form；13
For waveguide-based bottom, it is made of refractive index of the glass of n or other optical medium materials；141 be coupling input HOE；143 for
The HOE of the lens factor, the function of its existing coupling output, while collimation can also be played the role of, it can be by laser beam tune
It is made as collimated light beam；16 be DOE, for receiving the first speckle patterns 12, and is replicated and is extended to the second speckle patterns, is formed
The speckle light cluster of large area array is projected into scene to be measured；17 be object scene；18 the second final spots being projected out for mould group
Dot pattern.
Compared with embodiment shown in Fig. 2, the coupling output HOE 143 in Fig. 3 is hololens formula HOE (i.e. holographic saturating
Mirror optical element), it can be and carry out what interference was process by using plane wave and spherical wave.As a result, by collimation lens
A modulation device is merged into coupling elements, the lightening degree of system is improved, is convenient for miniaturized projection mould
Group design.In addition, the collimation lens factor in Fig. 3 can also add in coupling input HOE, embodiment of above can be root
Flexible modulation is carried out according to requirement of system design.
As shown in figure 4, the pattern light projective module group based on holographical wave guide of another embodiment of the present invention, which employs
Compound HOE element 144.Wherein, which includes array light source 11, it, which is arranged, is designed to luminous point
Source array, for providing the illumination of preset first speckle patterns, 12 form；13 be waveguide-based bottom, the glass for being n by refractive index
Or other optical medium materials are made；141 be coupling input HOE；Coupling output HOE 144 is to have both collimation lens and duplication light
The effect of grid, and it is also used as coupling elements use, it can be used to receive the first speckle patterns 12, and replicated
The second speckle patterns are extended to, form the speckle light cluster of large area array, projection is into practical scene to be measured；17 be object scene；
18 the second final speckle patterns being projected out for mould group.
Compared with embodiment shown in Fig. 3, the coupling output HOE 144 in Fig. 4 is to have both collimation lens and replica
Effect HOE, laser beam can either be modulated to collimated light beam, but can be realized speckle pattern modulation extension.By
Collimation lens, replica and coupling elements are merged into a modulation device, improve the lightening journey of system by this
Degree, is convenient for miniaturized projection module design.
As shown in figure 5, the pattern light projective module group based on holographical wave guide of another embodiment of the present invention, it will collimation
The lens factor and replica be added separately coupling input HOE with couple in output HOE.Specifically, holographical wave guide should be based on
Pattern light projective module group include array light source 11, it be arranged is designed to shine point source array, it is preset for providing
The illumination of first speckle patterns, 12 form；13 be waveguide-based bottom, the glass or other optical medium material systems for being n by refractive index
At；145 be the coupling input HOE with collimation lens function；146 export HOE for the coupling with replica function, are used for
The first speckle patterns 12 are received, and is replicated and is extended to the second speckle patterns, form the speckle light cluster of large area array, projection is extremely
In practical scene to be measured；17 be object scene；The 18 final speckle patterns being projected out for mould group.It is higher thereby, it is possible to realize
The lightening degree of system, is more convenient for miniaturized projection module design.
As shown in figs 6 a-6 c, the pattern light projective module group based on holographical wave guide of another embodiment of the present invention, thus
Substrate of glass can be cut into inclined surface, plane of the waveguide-based bottom at the second end is cut into inclined surface, to pass through
The laser beam that inclined surface couples pending waveguide transmission is stated, directly can replace coupling using the mode of inclined surface coupling input
HOE is inputted, realizes the raising to the energy utilization efficiency of system, and also a save modular manufacture cost.Specifically, such as Fig. 6 A
In the provided pattern light projective module group based on holographical wave guide, coupling output HOE 142 can be only have coupling it is defeated
Function out, and collimating effect is realized by the collimation lens of one side 15 and realizes that the modulation duplication of light beam is made by DOE 16
With；In pattern light projective module group as provided by Fig. 6 B based on holographical wave guide, coupling output HOE 143 can be holography
Lens optics thereto, and realize that the modulation duplication of light beam acts on by DOE 16；Holographical wave guide is based on as provided by Fig. 6 C
Pattern light projective module group in, coupling output HOE 143 can be the element for having both lens function and replica function.
It is furthermore preferred that antireflective film can also be coated in the inclined plane, thus increase coupling efficiency.It is based on shown in Fig. 6 A-6C
Members in the pattern light projective module group of holographical wave guide are referred to the associated description of foregoing embodiments, therefore herein just
It repeats no more.
In some preferred embodiments, coupling input HOE and/or coupling output HOE can be and exposed by laser interference
Made of light processing and fabricating.The holographic optical elements (HOE) as made of laser interference exposure processing and fabricating is applied as a result, compared to current
The pattern of DOE design of the application based on etching technics in the related technology, so that pattern light projective module in the present embodiment
Group uses the holographic optical elements (HOE) being process by laser interference exposure, and no ghost line interference problem simultaneously reduces spuious background
Light, and compared to etching technics production can more efficiently and cost it is lower.
It is prepared specifically, the hololens HOE with collimation lens function can be by plane wave and spherical surface wave interference
Made of hololens.Preferably, wave-front compensation technique also can be used in process and picture is carried out to interference process
Poor optimization design, to obtain the hololens of high imaging quality.Wherein, the focal length of hololens HOE and when preparation, are used
The coordinate parameters of spherical wave are related, therefore the focal length value of hololens can be controlled by setting the relevant parameter of interfering spherical wave,
And matched design is carried out in system design, reach the collimating effect of high quality.
Holographic grating HOE with grating replication extension function is to be prepared using the plane wave of corresponding wavelength through interference
's.Preferably, it in order to enable projection module can avoid mutually overlapping between each diffraction time speckle obtained, is making
It can also be in Preparation Method and customize screen periods by controlling.Corresponding holographic optics can be enabled specifically, can be and first obtain
Avoid the target screen periods mutually overlapped between the speckle of multiple diffraction times of element, such as the target screen periods should can
With the inputted collimated light beam that is that is matched with array light source can enable, (the second speckle pattern) in each diffraction time is exported
It is avoided between speckle mutually overlapping；Then, angle periodic model and target screen periods are based on, are determined during laser interference
Angle between two beam interferometer light beams, wherein the angle periodic model includes the pass between the angle of interfering beam and screen periods
System.
The diffraction time position for preparing HOE is determined by grating equation:
Wherein,WithRespectively laterally with vertical angle of diffraction, m and n are respectively lateral and vertical diffraction time,
Δ x and Δ y is respectively HOE in lateral and vertical screen periods.In order to realize in detectable depth bounds, HOE is each
It should be avoided between the VCSEL speckle patterns replicated in a diffraction time and mutually overlap, therefore can be needs to control in the processing of HOE
The angle theta of interfering beam.
The embodiment of the present invention also proposes that angle periodic model can be and meets the following conditions as a result:
Wherein, Δ is objective holographic screen periods, and λ is the wavelength of laser beam, and θ is the angle of interfering beam；As a result, may be used
To be the screen periods for controlling holographic grating by the angle theta between control interfering beam.
In addition, compound HOE has the function of that collimation lens and replica, preparation method can be by multiple simultaneously
Technology of preparing is closed, that is, double exposure record can be divided into, the lens factor and optical grating construction are processed together with a piece of
On HOE；Compound HOE can advanced optimize mould group as a result, achieve the purpose that more lightening design.
Being coupled into the two panels HOE of decoupling is holographic grating, by laser interference exposure processing and fabricating, before two interference waves
It is plane wave, the grating distribution of light intensity distribution that interference is formed are as follows:
I1=| exp (ik1·r)+exp(ik2·r)|2
=2+2cos [(k1-k2)r]
In formula, I1For interference optical field intensity, i is imaginary unit, k1And k2Respectively the wave vector of two beam collimated light beams, r are
The coordinate system of light beam.
On the other hand, there is hololens formula hololens formula HOE can be to carry out by using plane wave and spherical wave
Interference processing, interferes the distribution of light intensity formed are as follows:
In formula, I2For interference optical field intensity, i is imaginary unit, k3And k4The respectively wave vector of plane wave and spherical wave, r
For the coordinate system of light beam.Therefore, the focal length of made collimation lens HOE is related with the coordinate parameters of spherical wave, therefore can pass through
Set the focal length value of collimation lens HOE prepared by the relevant parameter control of interfering spherical wave.
In some embodiments, photosensitive used in holographic optical elements (HOE) HOE (including being coupled into HOE and decoupling HOE) preparation
Material also can also be light-sensitive material sensitive under the wavelength of the laser beam that array light source is issued, such as can be
940nm.And holographic optical elements (HOE) HOE can also be using opposite with the wavelength for the laser beam that array light source 11 is issued
The holographic grating that the light beam answered is prepared through interference exposure processing；For example, working as light source used in projective module group uses wavelength
When the infrared laser of 940nm, corresponding HOE also needs work under the conditions of corresponding wavelength 940nm, therefore dry when HOE preparation
Relate to the wavelength of light beam also Ying Xiangtong.
In embodiments of the present invention, it proposes and realizes frivolous structure, miniaturization and the speckle for being convenient for light source heat radiation again
A variety of design implementations of projective module group.Wherein, the first design implementation includes four parts: first part is array
Light source, preferably VCSEL light source, to export the first speckle patterns；Second part is holographical wave guide unit, by glass or other light
Learn medium substrate with as be coupled into and the two panels HOE of decoupling device form；Part III is collimation lens, it issues light source
Laser beam is modulated to collimated light beam；Part IV is DOE, it, which receives the first speckle patterns and is replicated, is expanded into not phase
Mutually the second speckle patterns that overlapping and spot density are evenly distributed, are projected on object scene to be measured.
For the frivolous degree of miniaturization for further increasing system, collimation lens being designed to, hololens formula HOE is bonded
In in waveguide medium substrate, used as coupling elements.Therefore second of design implementation includes three parts: first
Part is array light source, preferably VCSEL light source, to export the first speckle patterns；Second part is holographical wave guide unit, by glass
Glass or other optical medium substrates with as being coupled into and the two panels HOE of decoupling device is formed；Part III is DOE, it receives the
One speckle patterns and being replicated, which are expanded into, not to be overlapped and the second speckle patterns that spot density is evenly distributed, is projected to
On object scene to be measured.
For the frivolous degree of miniaturization for further improving system, also collimation lens can be designed to HOE with DOE and be bonded
In in waveguide medium substrate, used as coupling elements, or the two is respectively designed to coupling input and output function
HOE use.Therefore the third design implementation includes two parts: first part is VCSEL array light source, constitutes first
Speckle patterns；Second part is holographical wave guide unit, by glass or other optical medium substrates with as being coupled into and decoupling device
Two panels HOE composition, receive the first speckle patterns and being replicated and be expanded into and do not overlap and spot density is evenly distributed
The second speckle patterns, be projected on object scene to be measured.
It is furthermore preferred that decoupling HOE had both included the collimation lens factor or included DOE modulated structure, the two is uniformly designed to
A piece of compound HOE, so that the compound HOE has the function of collimation lens and duplication extension grating simultaneously.It is multiple about this
The preparation of mould assembly HOE, can be divided into double exposure record and complete, the lens factor and DOE optical grating construction are added together
For work on a piece of HOE, specific processing can refer to the interference of completely new lens optics thereto and holographic grating optical element above
Exposure process.
In addition, can be when being coupled into HOE as hololens formula HOE and decoupling HOE includes DOE optical grating construction by coupling
Enter HOE and decoupling HOE is fabricated separately.
Three of the above designs in implementation: for the energy utilization efficiency for improving system, can be cut into substrate of glass and incline
Inclined-plane directly replaces HOE using inclined surface coupling and the mode of input.If the side that the third implementation uses inclined surface to be coupled into
Formula is then needed collimation lens and DOE being designed to a piece of compound HOE, is fitted on waveguide-based bottom as unified decoupling function
Device uses.For the imaging effect for improving system, also above-mentioned slanted glass basal surface further can be designed as free form surface etc.
Face type, with optimization system aberration.
As a result, in the speckle projection mould group provided by the embodiment of the present invention, not only have compact-sized frivolous, small-sized
Change the high advantage of design degree, and light source can be separated centainly with the optical axis of other optical elements by the transfer function of waveguide
Distance individually increases radiator for light source, is conducive to the integral heat sink design of system.
The optional embodiment of the embodiment of the present invention is described in detail in conjunction with attached drawing above, still, the embodiment of the present invention is simultaneously
The detail being not limited in above embodiment can be to of the invention real in the range of the technology design of the embodiment of the present invention
The technical solution for applying example carries out a variety of simple variants, these simple variants belong to the protection scope of the embodiment of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the embodiment of the present invention pair
No further explanation will be given for various combinations of possible ways.
In addition, any combination can also be carried out between a variety of different embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is violated, equally should be considered as disclosure of that of the embodiment of the present invention.
Claims (13)
1. a kind of pattern light projective module group based on holographical wave guide, including holographical wave guide unit and for emitting corresponding first
The array light source of the laser beam of speckle patterns, wherein the holographical wave guide unit includes waveguide-based bottom, the first holographic optics member
Part and the second holographic optical elements (HOE), first holographic optical elements (HOE) fit in the first end at the waveguide-based bottom, and described second
Holographic optical elements (HOE) fits in the second end at the waveguide-based bottom；
Wherein, second holographic optical elements (HOE) is used to access to the laser beam coupling that the array light source is emitted described
Waveguide-based bottom, the laser beam can carry out waveguide transmission in the waveguide-based bottom, and pass through first holographic optics
Element output.
2. the pattern light projective module group according to claim 1 based on holographical wave guide, wherein the pattern light
Projective module group further includes the collimation lens for the laser beam to be modulated to collimated light beam, wherein
The collimation lens is disposed in proximity to the position of the first end, for modulating through the first holographic optical elements (HOE) institute
The laser beam of output, or
The collimation lens is disposed in proximity to the position of the second end, to be swashed for modulating by what the array light source was emitted
Light light beam.
3. the pattern light projective module group according to claim 2 based on holographical wave guide, wherein the collimation lens packet
It includes using one or more of following: simple lens, compound lens, microlens array and Fresnel Lenses.
4. the pattern light projective module group according to claim 1 based on holographical wave guide, wherein first holographic optical
Element is hololens optical element, for laser beam to be modulated to collimated light beam；Or
Second holographic optical elements (HOE) is hololens optical element, for laser beam to be modulated to collimated light beam.
5. the pattern light projective module group according to any one of claim 2-4 based on holographical wave guide, wherein described
Pattern light projective module group further include:
Diffraction optical element is extended to the second speckle patterns for receiving first speckle patterns and replicating, projects to be measured
In scene.
6. the pattern light projective module group according to any one of claim 2-4 based on holographical wave guide, wherein described
First holographic optical elements (HOE) is also equipped with grating replication function, be used to modulate extension collimated light beam to form the second speckle patterns,
And second speckle patterns are projected on object scene to be measured.
7. the pattern light projective module group according to claim 1 based on holographical wave guide, wherein first holographic optical
Learning element and the second holographic optical elements (HOE) includes transmission-type holographic optical elements (HOE) and/or reflecting HOE, and
First holographic optical elements (HOE) and second holographic optical elements (HOE) fit in the ipsilateral or heteropleural at the waveguide-based bottom.
8. the pattern light projective module group according to claim 1 based on holographical wave guide, wherein the laser beam exists
Being transmitted according to preset light propagation angle in the waveguide-based bottom, and meet following condition:
Wherein,For preset light propagation angle,For the angle of total reflection, n is the light refractive index at waveguide-based bottom.
9. a kind of pattern light projective module group based on holographical wave guide, including holographical wave guide unit and for emitting corresponding first
The array light source of the laser beam of speckle patterns, wherein the holographical wave guide unit includes waveguide-based bottom and the first holographic optics member
Part, first holographic optical elements (HOE) fit in the first end at the waveguide-based bottom；
Wherein, plane of the waveguide-based bottom at the second end is cut into inclined surface, to be coupled by the inclined surface
The laser beam of pending waveguide transmission, so that the laser beam can carry out waveguide transmission in the waveguide-based bottom,
And it is exported by first holographic optical elements (HOE).
10. the pattern light projective module group according to claim 9 based on holographical wave guide, wherein the pattern
Light projective module group further includes the collimation lens close to the first end, with for will be defeated through first holographic optical elements (HOE) institute
Laser beam out is modulated to collimated light beam.
11. the pattern light projective module group according to claim 9 based on holographical wave guide, wherein described first is holographic
Optical element is hololens optical element, for laser beam to be modulated to collimated light beam.
12. the pattern light projective module group described in 0 or 11 based on holographical wave guide according to claim 1, wherein the speckle
Structured light projection mould group further include:
Diffraction optical element is extended to the second speckle patterns for receiving first speckle patterns and replicating, projects to be measured
In scene.
13. the pattern light projective module group described in 0 or 11 based on holographical wave guide according to claim 1, wherein described first
Holographic optical elements (HOE) is also equipped with grating replication function, is used to modulate extension collimated light beam to form the second speckle patterns, and will
Second speckle patterns are projected on object scene to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811294220.4A CN109579728B (en) | 2018-11-01 | 2018-11-01 | Speckle structure light projection module based on holographic waveguide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811294220.4A CN109579728B (en) | 2018-11-01 | 2018-11-01 | Speckle structure light projection module based on holographic waveguide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109579728A true CN109579728A (en) | 2019-04-05 |
| CN109579728B CN109579728B (en) | 2021-11-30 |
Family
ID=65921041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811294220.4A Active CN109579728B (en) | 2018-11-01 | 2018-11-01 | Speckle structure light projection module based on holographic waveguide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109579728B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020015541A1 (en) * | 2018-07-16 | 2020-01-23 | 深圳市光鉴科技有限公司 | Light projection method and device |
| CN111649623A (en) * | 2020-06-11 | 2020-09-11 | 周扬斌 | Holographic sighting telescope |
| CN111708175A (en) * | 2020-06-29 | 2020-09-25 | 国科光芯(海宁)科技股份有限公司 | Structured light projection device |
| CN113534477A (en) * | 2020-04-14 | 2021-10-22 | 蒋晶 | Optical assembly, display system and manufacturing method |
| CN113740865A (en) * | 2021-08-31 | 2021-12-03 | 上海悠睿光学有限公司 | Structured light projection module and electronic equipment |
| CN113767331A (en) * | 2019-05-03 | 2021-12-07 | 奥迪股份公司 | Device for detecting color-related image content, and computing device and motor vehicle having such a device |
| CN113785248A (en) * | 2019-05-03 | 2021-12-10 | 奥迪股份公司 | Exterior lighting device for a motor vehicle |
| CN116500799A (en) * | 2023-06-29 | 2023-07-28 | 深圳市安思疆科技有限公司 | Structured light projector and structured light module |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103315A (en) * | 2011-01-04 | 2011-06-22 | 梁坚平 | Separated optical fiber light source device of mobile phone micro projector |
| CN104536088A (en) * | 2015-01-24 | 2015-04-22 | 上海理湃光晶技术有限公司 | Dentiform embedded planar waveguide optical device |
| CN104614858A (en) * | 2015-01-25 | 2015-05-13 | 上海理湃光晶技术有限公司 | Saw tooth structure plane waveguide visual optical display device for enhancing reality |
| CN105137598A (en) * | 2015-07-24 | 2015-12-09 | 浙江大学 | Transparent display screen, manufacturing method thereof, optical system and applications |
| CN105549150A (en) * | 2016-03-04 | 2016-05-04 | 东南大学 | Holographic waveguide display device |
| US20160139328A1 (en) * | 2013-06-20 | 2016-05-19 | Koninklijke Philips N.V. | Light emitting device |
| CN105929545A (en) * | 2016-06-20 | 2016-09-07 | 东莞市长资实业有限公司 | Waveguide type head-mounted display optical device |
| CN108594455A (en) * | 2018-03-23 | 2018-09-28 | 深圳奥比中光科技有限公司 | A kind of structured light projection module and depth camera |
-
2018
- 2018-11-01 CN CN201811294220.4A patent/CN109579728B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103315A (en) * | 2011-01-04 | 2011-06-22 | 梁坚平 | Separated optical fiber light source device of mobile phone micro projector |
| US20160139328A1 (en) * | 2013-06-20 | 2016-05-19 | Koninklijke Philips N.V. | Light emitting device |
| CN104536088A (en) * | 2015-01-24 | 2015-04-22 | 上海理湃光晶技术有限公司 | Dentiform embedded planar waveguide optical device |
| CN104614858A (en) * | 2015-01-25 | 2015-05-13 | 上海理湃光晶技术有限公司 | Saw tooth structure plane waveguide visual optical display device for enhancing reality |
| CN105137598A (en) * | 2015-07-24 | 2015-12-09 | 浙江大学 | Transparent display screen, manufacturing method thereof, optical system and applications |
| CN105549150A (en) * | 2016-03-04 | 2016-05-04 | 东南大学 | Holographic waveguide display device |
| CN105929545A (en) * | 2016-06-20 | 2016-09-07 | 东莞市长资实业有限公司 | Waveguide type head-mounted display optical device |
| CN108594455A (en) * | 2018-03-23 | 2018-09-28 | 深圳奥比中光科技有限公司 | A kind of structured light projection module and depth camera |
Non-Patent Citations (2)
| Title |
|---|
| 丁全心: "《中航工业首席专家技术丛书机载瞄准显示系统》", 30 November 2015 * |
| 曾飞等: ""全息波导头盔显示技术"", 《中国光学》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020015541A1 (en) * | 2018-07-16 | 2020-01-23 | 深圳市光鉴科技有限公司 | Light projection method and device |
| CN113767331A (en) * | 2019-05-03 | 2021-12-07 | 奥迪股份公司 | Device for detecting color-related image content, and computing device and motor vehicle having such a device |
| CN113785248A (en) * | 2019-05-03 | 2021-12-10 | 奥迪股份公司 | Exterior lighting device for a motor vehicle |
| CN113767331B (en) * | 2019-05-03 | 2023-05-05 | 奥迪股份公司 | Device for color-dependent image content detection, and computing device and motor vehicle having such a device |
| CN113534477A (en) * | 2020-04-14 | 2021-10-22 | 蒋晶 | Optical assembly, display system and manufacturing method |
| CN113534477B (en) * | 2020-04-14 | 2023-12-26 | 北京意链科技有限公司 | Optical assembly, display system and manufacturing method |
| CN111649623A (en) * | 2020-06-11 | 2020-09-11 | 周扬斌 | Holographic sighting telescope |
| CN111708175A (en) * | 2020-06-29 | 2020-09-25 | 国科光芯(海宁)科技股份有限公司 | Structured light projection device |
| WO2022000925A1 (en) * | 2020-06-29 | 2022-01-06 | 国科光芯(海宁)科技股份有限公司 | Structured light projection device |
| CN113740865A (en) * | 2021-08-31 | 2021-12-03 | 上海悠睿光学有限公司 | Structured light projection module and electronic equipment |
| CN116500799A (en) * | 2023-06-29 | 2023-07-28 | 深圳市安思疆科技有限公司 | Structured light projector and structured light module |
| CN116500799B (en) * | 2023-06-29 | 2023-08-22 | 深圳市安思疆科技有限公司 | Structured light projector and structured light module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109579728B (en) | 2021-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109579728A (en) | Pattern light projective module group based on holographical wave guide | |
| CN108957911A (en) | Pattern light projective module group and 3D depth camera | |
| CN105372824B (en) | A kind of bore hole 3D laser display apparatus | |
| CN104884862B (en) | Lighting apparatus | |
| US10739607B2 (en) | Light source module, sensing device and method for generating superposition structured patterns | |
| CN108873350A (en) | A kind of waveguide display device | |
| CN103488036B (en) | Holographic three-dimensional projection screen and projecting method thereof | |
| CN102854630B (en) | Three-dimensional display device based on constructive interferences | |
| CN208351151U (en) | Projective module group, depth camera and electronic equipment | |
| CN108828786A (en) | A kind of 3D camera | |
| CN109212773A (en) | Close-coupled speckle projection mould group and depth camera | |
| CN102947736A (en) | Diffractive combiner for a color head-up display (hud) device | |
| CN208188393U (en) | Waveguide assemblies and display device | |
| CN103105634B (en) | Thin flat type convergence lens | |
| CN111812841B (en) | Volume holographic grating two-dimensional pupil expansion waveguide piece and pupil expansion method thereof | |
| CN101275818A (en) | Holographic gun aiming light path system | |
| CN110505402A (en) | Control method, depth camera and electronic device | |
| CN107367795A (en) | The fiber coupling device of perfect optical eddy orbital angular momentum multiplex/demultiplex | |
| CN109581795A (en) | A kind of optical projection mould group, sensing device and equipment | |
| CN111381301B (en) | Method for calculating exposure parameters in preparation process of color holographic waveguide grating | |
| CN108828780A (en) | A kind of nearly eye display Optical devices based on holographic grating | |
| CN101408680B (en) | Four-range multiplication system far-field monitoring device and collimating method thereof | |
| CN108803067A (en) | A kind of optical depth camera and its signal optical source processing method | |
| CN208705580U (en) | A kind of nearly eye display Optical devices based on holographic grating | |
| CN209728341U (en) | Light splitting optical mould group and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |