CN109669271A - Light splitting optical mould group and its manufacturing method - Google Patents
Light splitting optical mould group and its manufacturing method Download PDFInfo
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- CN109669271A CN109669271A CN201910114770.1A CN201910114770A CN109669271A CN 109669271 A CN109669271 A CN 109669271A CN 201910114770 A CN201910114770 A CN 201910114770A CN 109669271 A CN109669271 A CN 109669271A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 128
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 230000010287 polarization Effects 0.000 claims abstract description 116
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- 238000012545 processing Methods 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 6
- 208000033748 Device issues Diseases 0.000 claims description 4
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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
- G02B27/10—Beam splitting or combining systems
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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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
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Abstract
The invention discloses a kind of light splitting optical mould groups, comprising: luminescent device；And diffraction optical element, the diffraction optical element is arranged on the light exit path of the luminescent device, and be configured to be modulated incident light to project at least two groups light beam and the corresponding at least two groups hot spot of number can be formed on the target surface, wherein polarization direction difference, and/or the light path difference from luminescent device to target surface that at least two groups light beam is mutual.
Description
Technical field
The present invention relates to optical technical field more particularly to the technical fields of diffraction optical element modulation and projection.
Background technique
Currently, cell phone manufacturer starts gradually using structural light three-dimensional sensing technology, structured light technique (Structured
It Light) is a kind of active triangulation technology, the basic principle is that: controllable photoelectricity, striation are projected by laser projecting apparatus
Or smooth surface forms characteristic point to body surface, and shoots image by video camera, the projectional angle of characteristic point is obtained, then according to calibration
Direction in space, location parameter out calculate the distance between characteristic point and camera lens principal point using triangulation principle,
The three-dimensional appearance of detection object is obtained, realizes recognition of face, three-dimensional modeling etc..Currently used structural light three-dimensional sensing technology includes
Pattern (dot matrix or speckle) projective module group and imaging modules.As described in the patent US9825425 of PrimeSense.Three-dimensional identification
It identifies that precision, which has, to be obviously improved compared to two dimension, approaches or surmount the accuracy of identification of human eye successively, and show huge business valence
Value.In Optics Express paper, Xiao Huang et al. proposes to utilize polarization structure pumped FIR laser, in the complex background ring of light
Under border, three-dimensional modeling accuracy of identification is improved.
Structure light scheme is mainly used in the unlock of Face ID face and payment, the mobile phones such as Apple Pay mobile payment at present
Class application and secure payment class product, such as cash register, recognition of face class product, such as certification comparison, gate, security type produce
Product, such as intelligent door lock, the unmanned superfine non-cell phone type application of quotient have the scene of higher demand to accuracy of identification, therefore how
Improving accuracy of identification is each manufacturer's urgent need.The primary structural element DOE of structured light projection mould group is limited to manufacture energy at present
Power, minimum feature size can not further reduce, and lead to the feature dot density of speckle pattern, and point size and number can not improve.
According to known technical solution, multimode group, or complicated system (such as LCD MODULE LCD) is usually utilized to generate polarization
Light generates dot matrix through DOE, then extracts more three-dimensional informations.Currently without compact, inexpensive polarization structure light solution party
Case.However, miniaturization, low cost solution is highly important for the consumer electronics industry.
The content of background technology part is only the technology that inventor is known, not the existing skill of natural representative this field
Art.
Summary of the invention
In view of this, the present invention proposes a kind of light splitting optical mould group, comprising: luminescent device；And diffraction optical element, it is described
Diffraction optical element is arranged on the light exit path of the luminescent device, and is configured to be modulated to project incident light
At least two groups light beam simultaneously can form the corresponding at least two groups hot spot of number on the target surface, wherein at least two groups light beam
Mutual polarization direction difference, and/or the light path from luminescent device to target surface are different.
According to an aspect of the present invention, polarization is provided between the luminescent device and the diffraction optical element to adjust
Element processed, the polarization modulation element be configured to the light modulation for being emitted the luminescent device at polarization direction it is different at least two
Group polarised light, number correspond at least two groups light beam, and the diffraction optical element is configured to modulate at least two groups inclined
Light shake to project at least two groups light beam, wherein the polarization modulation element is preferably polarization grating and/or light polarizing film, institute
It states luminescent device and is preferably vertical cavity surface emitting laser or edge-emitting laser or LED.The embodiment of the present invention utilizes polarization
The characteristic optimizing of light designs DOE, can reduce the size of characteristic point, and can increase characteristic point at double quantity, to mention
High accuracy of identification.The present invention makes diffraction optics knot by the chip surface in light emitting semiconductor device (such as VCSEL, LED)
Structure, control lighting cavity generate specific polarised light.For example, being directed to VCSEL light source point design diffraction grating structure, it is allowed to generate
Two groups of polarised lights.DOE of each group of polarised light by polarization optimization design can project one group of feature dot pattern.Relative to biography
The quantity of system scheme, point doubles, and may be implemented to greatly improve accuracy of identification.
According to an aspect of the present invention, the diffraction optical element is configured to project two groups of light beams and can be in object table
Two groups of hot spots are formed on face, or are projected four groups of light beams and can be formed four groups of hot spots on the target surface.
According to an aspect of the present invention, the light splitting optical mould group further includes beam splitting element, the beam splitting element setting
It between the luminescent device and the diffraction optical element, and is configured to for received light to be divided at least two groups beam splitting light, number
Mesh corresponds at least two groups light beam, and the diffraction optical element is configured to receive at least two groups beam splitting light, and modulates
With project at least two groups light beam.
According to an aspect of the present invention, it wherein the beam splitting element is polarization beam splitting element, is configured to received light
It is divided into the different at least two groups polarised light in polarization direction.
According to an aspect of the present invention, the beam splitting element is unpolarized optical splitter.
According to an aspect of the present invention, the diffraction optical element be configured to can be different by polarization direction incident light tune
It makes to form the pattern of distinguishing at least two groups hot spot on the target surface.
The present invention also provides a kind of light modulating methods, comprising: receives the light that luminescent device issues；It is first with diffraction optics is passed through
Part is modulated the light from the luminescent device, to project at least two groups light beam and can form number on the target surface
Corresponding at least two groups hot spot, wherein the mutual polarization direction of at least two groups light beam is different, and/or from photophore
The light path of part to target surface is different.
According to an aspect of the present invention, the light modulating method further includes being shone by polarization modulation element by described
The light modulation of the device outgoing at least two groups polarised light different at polarization direction, number correspond at least two groups light beam, institute
It states diffraction optical element and is configured to modulate at least two groups polarised light to project at least two groups light beam, wherein described inclined
The modulation element that shakes is preferably polarization grating and/or light polarizing film, and the luminescent device is preferably vertical cavity surface emitting laser or side
Emitting laser or LED
According to an aspect of the present invention, the diffraction optical element is configured to project two groups of light beams and can be in object table
Two groups of hot spots are formed on face, or are projected four groups of light beams and can be formed four groups of hot spots on the target surface.
According to an aspect of the present invention, the light modulating method further includes by being arranged in the luminescent device and institute
State the beam splitting element between diffraction optical element, received light be divided at least two groups beam splitting light, number correspond to it is described at least
Two groups of light beams, the diffraction optical element are configured to receive at least two groups beam splitting light, and modulate and project it is described at least
Two groups of light beams.
According to an aspect of the present invention, it wherein the beam splitting element is polarization beam splitting element, is configured to received light
It is divided into the different at least two groups polarised light in polarization direction；Or the beam splitting element is unpolarized optical splitter.
According to an aspect of the present invention, the diffraction optical element be configured to can be different by polarization direction incident light tune
It makes to form the pattern of distinguishing at least two groups hot spot on the target surface.
The present invention also provides a kind of electronic equipment, comprising: light splitting optical mould group as described above；Camera, the camera shooting
Head acquires the pattern that the hot spot is formed；And processing unit, the processing unit receive the pattern of camera acquisition and right
The pattern is handled.
The present invention also provides a kind of manufacturing methods of light splitting optical mould group, comprising: provides the substrate of optics module；Described
Luminescent device is prepared in substrate；Diffraction optical element, the diffraction optics are formed on the light exit path of the luminescent device
The pairs of incident light of element configuration is modulated to project at least two groups light beam and can to form on the target surface number corresponding
At least two groups hot spot, the mutual polarization direction of at least two groups light beam is different, and/or from luminescent device to object table
The light path in face is different.
According to an aspect of the present invention, the manufacturing method further include: in the luminescent device and the diffraction light
Learn and polarization modulation element be set between element, the polarization modulation element be configured to the light modulation for being emitted the luminescent device at
The different at least two groups polarised light in polarization direction, number correspond at least two groups light beam, the diffraction optical element configuration
At the modulation at least two groups polarised light to project at least two groups light beam, wherein the polarization modulation element is preferably inclined
Vibration grating and/or light polarizing film, the luminescent device are preferably vertical cavity surface emitting laser or edge-emitting laser or LED.
According to an aspect of the present invention, the manufacturing method further include: further include the luminescent device with it is described
Beam splitting element is set between diffraction optical element, and the beam splitting element simultaneously is configured to received light being divided at least two groups beam splitting
Light, number correspond at least two groups light beam, and the diffraction optical element is configured to receive at least two groups beam splitting light, and
Modulate and project at least two groups light beam.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows a kind of light splitting optical mould group according to a first embodiment of the present invention；
Fig. 2 shows light splitting optical mould groups according to a second embodiment of the present invention；
Fig. 3 shows an example of luminescent device；
Fig. 4 shows the pattern of the random light emission point of luminescent device in the case where no polarization modulation element；
After Fig. 5 shows setting polarization modulation element, the light that each luminescent device issues is modulated to both direction
Polarised light；
Fig. 6 shows the spot pattern according to an embodiment of the invention projected；
Fig. 7 spot pattern in accordance with another embodiment of the present invention projected；
Fig. 8 shows light splitting optical mould group in accordance with another embodiment of the present invention；
Fig. 9 shows light modulating method according to an embodiment of the invention；
Figure 10 shows electronic equipment according to another embodiment of the present invention；
Figure 11 shows a kind of manufacturing method of light splitting optical mould group according to an embodiment of the invention；With
Figure 12 shows light splitting optical mould group in accordance with another embodiment of the present invention.
Specific embodiment
Hereinafter, certain exemplary embodiments are simply just described.As one skilled in the art will recognize that
Like that, without departing from the spirit or scope of the present invention, described embodiment can be modified by various different modes.
Therefore, attached drawing and description are considered essentially illustrative rather than restrictive.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width
Degree ", " thickness ", " go up ", " under ", " preceding ", " afterwards ", " left side ", " right side ", " heavily fortified point, and directly ", " level ", " top ", " bottom ", " is interior ", " outside ", "
Clockwise ", " counterclockwise " wait the orientation or positional relationship of instructions to be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second " are only
For descriptive purposes, it is not understood to indicate or imply relative importance or implicitly indicates the number of indicated technical characteristic
Amount." first " is defined as a result, the feature of " second " can explicitly or implicitly include one or more spy
Sign.In the description of the present invention, " multiple " are meant that two or more, unless otherwise specifically defined.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected: can
To be mechanical connection, it is also possible to be electrically connected or can mutually communicate；It can be directly connected, it can also be by between intermediary
It connects connected, can be the connection inside two elements or the interaction relationship of two elements.For the ordinary skill of this field
For personnel, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature its " upper " or it " under "
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature second feature " on ", " top " and " above " include first spy
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and it is " following " including fisrt feature right above second feature and oblique upper, or be merely representative of
First feature horizontal height is less than second feature.
Following disclosure provides many different embodiments or example is used to realize different structure of the invention.In order to
Simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.Certainly, they are merely examples, and
And it is not intended to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or reference letter,
This repetition is for purposes of simplicity and clarity, itself not indicate between discussed various embodiments and/or setting
Relationship.In addition, the present invention provides various specific techniques and material example, but those of ordinary skill in the art can be with
Recognize the application of other techniques and/or the use of other materials.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Fig. 1 shows a kind of light splitting optical mould group 100 according to a first embodiment of the present invention.As shown in Figure 1, light splitting optical
Mould group 100 includes: luminescent device 101 and diffraction optical element DOE 103.Diffraction optical element 103 is arranged in luminescent device 101
Light exit path on, and be configured to be modulated incident light to project at least two groups light beam and can be in target surface 105
The corresponding at least two groups hot spot of upper formation number, wherein at least two groups light beam it is mutual polarization direction it is different and/
Or from luminescent device 101 to the light path of target surface 105 difference.It is detailed below.
As shown in Figure 1, luminescent device 101 can be polarized light source, it is also possible to unpolarized light source.Luminescent device 101
Light beam 102 is issued, diffraction optical element 103 is modulated incident light, and projects first group of light beam 104 and second group of light beam
106, corresponding two groups of hot spots are formed on target surface 105.Wherein first group of light beam 104 and second group of light beam 106 are certain
It is different in terms of optical characteristics, such as polarization direction difference, and/or not from luminescent device 101 to the light path of target surface 105
Together.Other than polarization direction, light path, those skilled in the art are contemplated that using other optical characteristics.These all exist
In the scope of the present invention.Wherein target surface 105 can be face or other to be identified or irradiation surfaces, both can be with
It is plane, is also possible to curved surface.Meanwhile it will be appreciated by those skilled in the art that first group of light beam in the present invention and
Two groups of light beams are opposite concepts.As described above, the light beam of different groups is different in terms of certain optical characteristics, and same group
Light in light beam is identical in terms of these optical characteristics, such as polarization direction is identical, and/from luminescent device 101 to object table
The light path in face 105 is identical.
Compared to the prior art, the light splitting optical mould group 100 of first embodiment of the invention can project the incident beam modulated
Two groups of hot spots out, this two groups of hot spots are not exclusively overlapped in position, while may be carried some other information and for example be polarized letter
Breath.The scheme of the feature dot density sum number amount of speckle pattern through the invention has obtained further raising, to improve identification
Precision.
Fig. 1 is illustrated by taking two groups of light beams, two groups of hot spots as an example.Those skilled in the art can adopt on this basis
With the technical solution of more multiple groups light beam, more multiple groups hot spot.These are within.
The preferred embodiment of light splitting optical mould group of the present invention is described below.
Fig. 2 shows light splitting optical mould groups 200 according to a second embodiment of the present invention.As shown in Fig. 2, luminescent device 201
Two groups of polarised lights 2021 and 2022 are emitted, wherein polarised light 2021 is, for example, the polarised light of X-direction, and polarised light 2022 is, for example, Y
The polarised light in direction.Polarised light 2021 and 2022 is incident on diffraction optical element 203, and diffraction optical element 203 is configured to root
According to the polarization state of incident light, two groups of polarised lights 2021 and 2022 are modulated to project two groups of light beams 204 and 206, in mesh
Mark forms two groups of hot spots on surface 205, and wherein the polarization direction of light beam 204 and 206 is different.
Fig. 3 shows an example of luminescent device 201.As shown in figure 3, luminescent device 201 includes vertical-cavity surface-emitting
Laser (VCSEL) 2011 and polarization modulation element 2013, what polarization modulation element 2013 was configured to for luminescent device 201 to be emitted
The light modulation at least two groups polarised light different at polarization direction, number corresponds at least two groups light beam, wherein the polarization
Modulation element 2013 is preferably polarization grating.It optionally, can also be more by being attached on vertical cavity surface emitting laser 2011
The light polarizing film in a direction realizes polarization modulation element 2013.It is readily appreciated that, in addition to vertical cavity surface emitting laser, luminescent device
201 may also include edge-emitting laser or LED.
The embodiment of the present invention can be made by the chip surface in light emitting semiconductor device (such as VCSEL, LED)
Diffractive optical structure (such as polarization grating), control lighting cavity generate specific polarised light.For example, being directed to VCSEL light source point
Diffraction grating structure is designed, it is allowed to generate two groups of polarised lights.Diffraction optics member of each group of polarised light by polarization optimization design
Part DOE can project one group of feature dot pattern.Quantity relative to traditional scheme, point doubles, and may be implemented substantially to mention
High accuracy of identification.The present embodiment relates generally to process diffractive optical structure in the upper surface of VCSEL emitting cavity, can make VCSEL
Issue the linearly polarized light of special polarization state.As shown in Fig. 2, processing grating in the upper surface VCSEL, realizing a single point light of VCSEL
Source exports both direction polarised light.The DOE element Jing Guo optimization design is combined, dot matrix as shown in FIG. 6 is formed.
The present embodiment makes full use of the characteristic of polarised light, and the surface of VCSEL random light emission source point is designed to super surface
(metasurface), it is made to issue the linearly polarized light of the linearly polarized light of X-direction and Y-direction, while excellent according to the direction of polarised light
Change design polarization DOE structure, generates two groups of polarization structure luminous point battle arrays.Compared with traditional design scheme, the quantity of characteristic point is doubled.
And the size of characteristic point can be reduced, the density of further lifting feature point.
It is readily appreciated that, the luminescent device of the present embodiment may include VCSEL light source dot matrix.
Scheme described in the present embodiment can increase project structured light mould group at double characteristic point quantity, and can
To reduce the size of characteristic point, to improve accuracy of identification.
If the trimmed book body that light source issues is non-polarized light, the Polarization Modulation member of the upper surface VCSEL can also be passed through
Part (such as polarization grating) becomes the polarised light of different directions, so as to form distinguishing dot matrix to different polarization directions
Pattern.
Fig. 3 shows the light modulation for issuing VCSEL 2011 by polarization modulation element 2013 at least two directions
Polarised light.The present invention is not limited to generate polarised light by individual polarization modulation element, it can also directly be arranged at least two
A polarized light source generates the polarised light at least two directions.These are all within the scope of the present invention.
Fig. 4 is shown in the case where no polarization modulation element 2013, vertical cavity surface emitting laser 2011 it is random
The pattern of luminous point.After Fig. 5 shows setting polarization modulation element 2013, each vertical cavity surface emitting laser 2011 is issued
Light be modulated to the polarised light of both direction, the respectively polarised light of the polarised light of X-direction and Y-direction.Fig. 6 shows polarization
After the light that modulation element 2013 is emitted is modulated by diffraction optical element 203, two groups of hot spots are formd on the target surface, because
The number of spots projected is increased one times by this.
Diffraction optical element 203 is configured to can be by the different the incident beam modulated in polarization direction to be formed on the target surface
The pattern of at least two groups hot spot of difference." distinguishing at least two groups hot spot " refers to that there are certain between two groups of hot spots in the present invention
The difference of a little aspects, such as the difference on facula position form difference between the polarization direction of the light of hot spot, light from light
Source to target surface light path difference etc..
It is to be illustrated by taking two groups of polarised lights as an example above, it should be readily apparent to one skilled in the art that the present invention can adopt
With more multiple groups polarised light.As shown in Figure 7, wherein the light that each vertical cavity surface emitting laser 2011 issues passes through Polarization Modulation
Element 2013 is modulated into the polarised light of four direction, the respectively direction α polarised light, the direction β polarised light, the direction γ polarised light
With the direction δ polarised light, a single point light source output four direction polarised light of VCSEL is realized.Diffraction optical element 2013 is for inclined
The polarization direction of vibration light is modulated, and four groups of hot spots is projected, wherein the polarization direction of the light of every group of hot spot is all different.This
Sample, compared to the light projection for directly issuing vertical cavity surface emitting laser 2011 to the technical solution of diffraction optical element 2013,
Each direction of polarized light forms a dot matrix, and the number of hot spot has become four times.
Above to be mainly illustrated by taking vertical cavity surface emitting laser as an example, luminescent device 201 is not limited to vertical cavity
Surface-emitting laser also may include other kinds of polarization or unpolarized light source.
Fig. 8 shows the light splitting optical mould group 300 of another preferred embodiment according to the present invention.As shown in figure 3, in addition to hair
Except optical device 301 and diffraction optical element 303, light splitting optical mould group 300 further includes beam splitting element 307, and beam splitting element 307 is set
It sets between the luminescent device 301 and the diffraction optical element 303, and is configured to for received light to be divided at least two groups point
Shu Guang, number correspond at least two groups light beam, and the diffraction optical element 303 is configured to receive at least two groups beam splitting
Light, and at least two groups light beam is modulated and projects, to form the corresponding at least two groups light of number on target surface 305
Spot.
According to a preferred embodiment, the beam splitting element 307 is polarization beam splitting element, is configured to for received light being divided into
The different at least two groups polarised light in polarization direction, is incident on diffraction optical element 303, with the corresponding at least two groups polarization side of number
To different beam projectings, the hot spot of corresponding number is formed.
According to a preferred embodiment of the present invention, as shown in figure 8, beam splitting element 307 is polarizing beam splitter, including polarization
Beam-splitting surface 3071 and reflecting surface 3072.Polarization beam splitting face 3071 may make incident light 302 to be separated according to its polarization direction, such as
X-direction polarised light 3022 is injected on diffraction optical element 303 by refraction；Y-direction polarised light 3021 is by polarization beam splitting face
3071 reflections, and then reflected by reflecting surface 3072, it is again incident on diffraction optical element 303.For Y-direction polarised light 3021,
Its light source virtual image is 301 ', as shown in figure 8, the light path of Y-direction polarised light 3021 is longer, the light path of X-direction polarised light 3022 compared with
It is short.
According to one embodiment, the beam splitting element 307 can be unpolarized optical splitter.
By the way that optical splitter/beam splitting element is arranged, luminescent device can reduce the distance between to diffraction optical element DOE,
Increase quantity a little simultaneously, is directly added into polarized light splitting device in light source and DOE.If the device uses refractive index for 1.5
Material, wherein the light path of the polarised light 3022 of polarization direction 1 will increase about 50%, the light path of the polarised light 3021 of polarization direction 2
About 100% will be increased.Long-focus can be formed in this way and dot matrix projective module group that short focus combines, be conducive to increase working distance
From.According to image relationship, the light beam of optical length corresponds to long-focus, and the short light beam of light path corresponds to short focus.If luminescent device is
Unpolarized, beam splitter is ordinary beamsplitter, and above-mentioned index path scheme is equally applicable.The light path of the separated light beam of optical splitter will
Difference causes focal length different.Illustrate by taking Fig. 8 embodiment as an example, for unpolarized luminescent device, diffraction optical element 303
Different zones can according to the light path length of different groups of incident beam (object distance is different) and with different microstructure (such as
In fig. 8, the microstructure of the microstructure of 303 upper half of diffraction optical element and lower half is different, respectively to being incident on it
On the different light beam of light path be modulated), incident beam is modulated accordingly according to light path length, to form difference
Focal length.And for the luminescent device of polarization, different microstructures can be set on diffraction optical element 303 with subregion to right
The polarised light in different polarization direction is modulated accordingly, and different microstructures is arranged it is also not necessary to subregion, similar
Fig. 1 and situation shown in Fig. 2, the light beam in different polarization direction are incident on diffraction optical element, and diffraction optical element can basis
It is modulated accordingly the polarization direction of incident light.If light source is divided into 2 or more light beams, above-mentioned index path scheme is also the same
It is applicable in.Two groups of hot spots are shown located in different planes in Fig. 8, are not construed as limiting the invention, two groups of hot spots
It can be located in identical plane.
The embodiment of Fig. 8 can be combined with the embodiment of Fig. 2-7, such as the luminescent device 301 of Fig. 8 may include that polarization is adjusted
Element processed, so that the light of single point light source is modulated to multiple directions polarised light, such as the polarised light of both direction, and in turn
It is incident on beam splitting element 307.
Fig. 9 shows light modulating method 400 according to an embodiment of the invention.As shown in figure 9, light modulating method 400
Include:
In step S401, the light that luminescent device issues is received.
In step S402, the light from the luminescent device is modulated by diffraction optical element, with project to
Few two groups of light beams simultaneously can form the corresponding at least two groups hot spot of number on the target surface, wherein at least two groups light beam phase
Polarization direction difference between mutually, and/or the light path from luminescent device to target surface are different.
The light modulating method 400 of the present embodiment can be carried out by light splitting optical mould group 100,200,300 as described above.
According to a preferred embodiment of the present invention, light modulating method 400 further include will be described by polarization modulation element
The light modulation of the luminescent device outgoing at least two groups polarised light different at polarization direction, number correspond at least two groups light
Beam, wherein diffraction optical element is configured to modulate at least two groups polarised light to project at least two groups light beam, wherein
The polarization modulation element is preferably polarization grating and/or light polarizing film, and the luminescent device is preferably vertical cavity surface-emitting laser
Device or edge-emitting laser or LED.The light of vertical cavity surface emitting laser outgoing is illustrated in figure 5 by polarization modulation element
The X-direction polarised light and Y-direction polarised light formed after (such as polarization grating or polarizing coating).Diffraction optical element is for inclined
Vibration light is designed, and is projected different light beams according to the difference of polarization direction, is formed corresponding hot spot.
The present invention is not limited to the numbers of light beam and hot spot, can be two groups of light beams and two groups of hot spots, are also possible to four groups of light
Beam and four groups of hot spots, can also be with other numbers.These are all within the scope of the present invention.
A preferred embodiment according to the present invention further includes by being arranged in the luminescent device and the diffraction light
The beam splitting element between element to be learned, received light is divided at least two groups beam splitting light, number corresponds at least two groups light beam,
The diffraction optical element is configured to receive at least two groups beam splitting light, and modulates and project at least two groups light beam.
Wherein the beam splitting element can be polarization beam splitting element, be configured to for received light to be divided into the different at least two groups in polarization direction
Polarised light.Beam splitting element may be unpolarized optical splitter.
A preferred embodiment according to the present invention, diffraction optical element are configured to incidence that can be different by polarization direction
Light modulation to form the pattern of distinguishing at least two groups hot spot on the target surface.
Figure 10 shows electronic equipment 500 according to another embodiment of the present invention, comprising: light splitting optical mould as described above
Group 100/200/300, camera 501 and processing unit 502.Electronic equipment 500 can be mobile phone, PAD, laptop,
Various types of electronic equipments such as desktop computer, monitoring system.Light splitting optical mould group projects at least two on the target surface
After group hot spot, camera 501 acquires the pattern that the hot spot is formed, and processing unit 502 is transferred to be handled and analyzed.This
The embodiment of invention can have various uses, such as be unlocked for acquiring spot pattern later by projective structure light, people
The applications such as face identification, monitoring.The receiver that can be polarization is also possible to common receiver.If it is common receiver,
Can simply gather together image processing.If it is polarized reception device, the polarization properties information of physics records together
Get off, as more accurately three-dimension sensor.
Figure 11 shows a kind of manufacturing method 600 of light splitting optical mould group according to an embodiment of the invention.Such as Figure 11
It is shown, in step S601, provide the substrate of optics module；In step S602, luminescent device is prepared on the substrate；In step
S603, forms diffraction optical element on the light exit path of the luminescent device, and the diffraction optical element is configured to entering
Light is penetrated to be modulated to project at least two groups light beam and the corresponding at least two groups hot spot of number can be formed on the target surface,
The mutual polarization direction difference of at least two groups light beam, and/or the light path difference from luminescent device to target surface.
According to one embodiment of present invention, manufacturing method 600 further include: in the luminescent device and the diffraction optics
Polarization modulation element is set between element, and the light modulation that the polarization modulation element is configured to for the luminescent device being emitted is at inclined
Shake the different at least two groups polarised light in direction, and number corresponds at least two groups light beam, and the diffraction optical element is configured to
At least two groups polarised light is modulated to project at least two groups light beam, wherein the polarization modulation element preferably polarizes
Grating and/or light polarizing film, the luminescent device are preferably vertical cavity surface emitting laser or edge-emitting laser or LED.
According to one embodiment of present invention, manufacturing method 600 further include: the luminescent device and diffraction optics member
Beam splitting element is set between part, and the beam splitting element simultaneously is configured to for received light to be divided at least two groups beam splitting light, and number is corresponding
In at least two groups light beam, the diffraction optical element is configured to receive at least two groups beam splitting light, and modulates and project
At least two groups light beam out.
Figure 12 shows light splitting optical mould group 700 in accordance with another embodiment of the present invention, with light splitting optical shown in Fig. 8
Mould group 300 is similar.Light splitting optical mould group 300 compared to Fig. 8, the light splitting optical mould group 700 of Figure 12 include multiple beam-splitting surfaces, example
Beam-splitting surface 1, beam-splitting surface 2, beam-splitting surface 3, beam-splitting surface 4 or more beam-splitting surfaces as illustrated in the drawing.By the way that multiple beam splitting are arranged
The light beam that light source issues can be divided into the different light beam of multiple groups light path, four groups of light beams are shown as in Figure 12, are incident on respectively by face
Different zones on diffraction optical element surface go out.Correspondingly, different zones on diffraction optical element surface are according to entering
The difference of irradiating light beam light path and have different microstructures, incident beam is modulated accordingly, to form different cokes
Away from projecting different groups of light beam and the corresponding hot spot of number can be formed on the target surface.Alternatively, each beam-splitting surface can be with
It is polarization beam splitting face, such as the light beam that light source issues is divided into the polarised light of multiple polarization directions.In the case, diffraction optics
Necessarily there is different microstructures in different zones on element surface, it is different inclined shown in situation as depicted in figs. 1 and 2
The light beam in vibration direction is incident on diffraction optical element, and diffraction optical element can carry out corresponding according to the polarization direction of incident light
Modulation.By increasing multiple beam-splitting surfaces, each light beam corresponds to different focal lengths, and long short focus combines, and can increase and cover
Range.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (17)
1. a kind of light splitting optical mould group, comprising:
Luminescent device；With
Diffraction optical element, the diffraction optical element are arranged on the light exit path of the luminescent device, and are configured to pair
Incident light is modulated to project at least two groups light beam and can form the corresponding at least two groups light of number on the target surface
Spot,
The wherein mutual polarization direction difference of at least two groups light beam, and/or the light from luminescent device to target surface
Cheng Butong.
2. light splitting optical mould group according to claim 1, which is characterized in that in the luminescent device and the diffraction optics
Be provided with polarization modulation element between element, the polarization modulation element be configured to the light modulation for being emitted the luminescent device at
The different at least two groups polarised light in polarization direction, number correspond at least two groups light beam, the diffraction optical element configuration
At the modulation at least two groups polarised light to project at least two groups light beam, wherein the polarization modulation element is preferably inclined
Vibration grating and/or light polarizing film, the luminescent device are preferably vertical cavity surface emitting laser or edge-emitting laser or LED.
3. light splitting optical mould group according to claim 1 or 2, which is characterized in that the diffraction optical element is configured to throw
It projects two groups of light beams and two groups of hot spots can be formed on the target surface, or project four groups of light beams and can be formed on the target surface
Four groups of hot spots.
4. light splitting optical mould group according to claim 1 or 2 or 3, which is characterized in that it further include beam splitting element, described point
Beam element is arranged between the luminescent device and the diffraction optical element, and is configured to received light being divided at least two groups
Beam splitting light, number correspond at least two groups light beam, and the diffraction optical element is configured to receive at least two groups beam splitting
Light, and modulate and project at least two groups light beam, the beam splitting element is preferably unpolarized optical splitter.
5. light splitting optical mould group according to claim 4, which is characterized in that wherein the beam splitting element is polarization beam splitting member
Part is configured to for received light to be divided into the different at least two groups polarised light in polarization direction.
6. light splitting optical mould group according to claim 1 or 2, which is characterized in that the diffraction optical element has and institute
Corresponding at least two region of number of spots is stated, the microstructure at least two region is different, is respectively configured in pairs
The different light beam of light path incident thereon is modulated.
7. light splitting optical mould group according to claim 1 or 2, which is characterized in that the diffraction optical element is configured to can
The different the incident beam modulated in polarization direction is formed to the pattern of distinguishing at least two groups hot spot on the target surface.
8. a kind of light modulating method, comprising:
Receive the light that luminescent device issues；With
The light from the luminescent device is modulated by diffraction optical element, to project at least two groups light beam and can be
The corresponding at least two groups hot spot of number is formed on target surface,
The wherein mutual polarization direction difference of at least two groups light beam, and/or the light from luminescent device to target surface
Cheng Butong.
9. light modulating method according to claim 8, which is characterized in that further include by polarization modulation element by the hair
The light modulation of the optical device outgoing at least two groups polarised light different at polarization direction, number correspond at least two groups light beam,
The diffraction optical element is configured to modulate at least two groups polarised light to project at least two groups light beam, wherein described
Polarization modulation element is preferably polarization grating and/or light polarizing film, the luminescent device be preferably vertical cavity surface emitting laser or
Edge-emitting laser or LED.
10. light modulating method according to claim 8 or claim 9, which is characterized in that the diffraction optical element is configured to project
Two groups of light beams and two groups of hot spots can be formed on the target surface out, or project four groups of light beams and can form four on the target surface
Group hot spot.
11. the light modulating method according to any one of claim 8-10, which is characterized in that further include by being arranged in institute
The beam splitting element between luminescent device and the diffraction optical element is stated, received light is divided at least two groups beam splitting light, number
Corresponding at least two groups light beam, the diffraction optical element is configured to receive at least two groups beam splitting light, and modulate and
Project at least two groups light beam.
12. the light modulating method according to any one of claim 8-11, which is characterized in that wherein the beam splitting element is
Polarization beam splitting element is configured to for received light to be divided into the different at least two groups polarised light in polarization direction；Or the beam splitting member
Part is unpolarized optical splitter.
13. the light modulating method according to any one of claim 8-12, which is characterized in that the diffraction optical element is matched
It is set to the pattern that the different the incident beam modulated in polarization direction can be formed on the target surface to distinguishing at least two groups hot spot.
14. a kind of electronic equipment, comprising:
Such as light splitting optical mould group of any of claims 1-7；
Camera, the camera acquire the pattern that the hot spot is formed；With
Processing unit, the processing unit receive the pattern of the camera acquisition and handle the pattern.
15. a kind of manufacturing method of light splitting optical mould group, comprising:
The substrate of optics module is provided；
Luminescent device is prepared on the substrate；
Diffraction optical element is formed on the light exit path of the luminescent device, the diffraction optical element is configured to incidence
Light is modulated to project at least two groups light beam and can form the corresponding at least two groups hot spot of number, institute on the target surface
State the mutual polarization direction difference of at least two groups light beam, and/or the light path difference from luminescent device to target surface.
16. manufacturing method as claimed in claim 15, which is characterized in that further include: in the luminescent device and the diffraction
Polarization modulation element is set between optical element, and the polarization modulation element is configured to the light modulation for being emitted the luminescent device
At the different at least two groups polarised light in polarization direction, number corresponds at least two groups light beam, and the diffraction optical element is matched
The modulation at least two groups polarised light is set to project at least two groups light beam, wherein the polarization modulation element is preferably
Polarization grating and/or light polarizing film, the luminescent device are preferably vertical cavity surface emitting laser or edge-emitting laser or LED.
17. manufacturing method according to claim 15 or 16, which is characterized in that further include: it further include in the photophore
Beam splitting element is set between part and the diffraction optical element, and the beam splitting element simultaneously is configured to received light being divided at least two
Group beam splitting light, number correspond at least two groups light beam, and the diffraction optical element is configured to receive at least two groups point
Shu Guang, and modulate and project at least two groups light beam.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910114770.1A CN109669271A (en) | 2019-02-14 | 2019-02-14 | Light splitting optical mould group and its manufacturing method |
| US17/431,060 US20220075200A1 (en) | 2019-02-14 | 2020-01-10 | Beam-splitting optical module and manufacturing method thereof |
| EP20756111.9A EP3926388A4 (en) | 2019-02-14 | 2020-01-10 | Beam-splitting optical module and manufacturing method therefor |
| PCT/CN2020/071453 WO2020164346A1 (en) | 2019-02-14 | 2020-01-10 | Beam-splitting optical module and manufacturing method therefor |
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| CN201910114770.1A CN109669271A (en) | 2019-02-14 | 2019-02-14 | Light splitting optical mould group and its manufacturing method |
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