CN108132573A - Floodlighting module - Google Patents
Floodlighting module Download PDFInfo
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- CN108132573A CN108132573A CN201810037174.3A CN201810037174A CN108132573A CN 108132573 A CN108132573 A CN 108132573A CN 201810037174 A CN201810037174 A CN 201810037174A CN 108132573 A CN108132573 A CN 108132573A
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- light source
- light
- light beam
- floodlighting
- diffraction
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
The present invention provides a kind of floodlighting module, including：Light source, for emitting light beam；Diffraction optical element replicates and extends the light beam to cover the illuminated space of filling；The angle of divergence for the incident beam that the light beam is formed on diffraction optical element is not less than the angle between the neighboring diffraction light beam formed after the diffraction optical element.The present invention to light source by being configured diffraction optical element, and the diffraction optical element meets：The angle of divergence of incident beam that the light beam of light source transmitting is formed on diffraction optical element is not less than the angle between the neighboring diffraction light beam formed after the diffraction optical element, so as to be replicated and be extended the light beam of light source transmitting, so that the area of outgoing beam is much larger than the beam area of primary source transmitting, Landfill covering fills illuminated space.The floodlighting module has small, low in energy consumption, but the characteristics of emittance area is big, illumination zone is wide, is conducive to be integrated into smart machine, provides floodlighting.
Description
Technical field
The present invention relates to field of semiconductor illumination more particularly to a kind of floodlighting modules.
Background technology
Visual information is increasingly becoming smart machine and obtains information, the important channel for perceiving the world, with smart machine work(
Can be on the increase, application scenarios diversification, the demand that view-based access control model information is realized is also more and more extensive.For example, based on people
The unlock of face identification the functional requirements such as interacts, while these functions also need with payment, based on the gesture of human body information with acting
Will under different scenes, have higher reliability under varying environment illumination condition.In traditional equipment cromogram is obtained using camera
As information has been difficult to meet these demands, based on the acquisition of vision information of active optical illumination, such as infrared image, then can be promoted not
The reliability of same scene, varying environment illumination condition acquisition of vision information, and depth camera is utilized to obtain depth image then can be with
Realize the function that common color image is difficult to realize, such as high-precision recognition of face, gesture interaction.In addition, utilize depth camera
The situations such as recognition of face are carried out, in night occasion, need to carry out floodlighting to target, to realize high-precision identification.
Infrared illumination, infrared camera, depth camera etc. will more and more be applied in smart machine with obtain it is infrared,
The visual informations such as depth image.However, thus also bring some problems.Being miniaturized of smart machine, lightening trend causes
Integrating so many device becomes particularly difficult.On the one hand, more devices can bring higher power consumption thus can reduce intelligence
The cruising ability of equipment；On the other hand, the requirement of the pairs of packaging technology of collection of more devices is substantially improved so that under product yield
Drop, the production cost increases.
Invention content
To solve the above problems, the present invention provides a kind of frivolous floodlighting module, with small, low in energy consumption
Advantage is more advantageous to being integrated into smart machine, provides floodlighting.
Floodlighting module provided by the invention, including：Light source, for emitting light beam；Diffraction optical element is replicated and is expanded
Light beam described in exhibition fills illuminated space to cover；The angle of divergence for the incident beam that the light beam is formed on diffraction optical element
Not less than the angle between the neighboring diffraction light beam formed after the diffraction optical element.
In some embodiments, the floodlighting module further includes lens, and the lens are located at the light source and institute
Between stating diffraction optical element, for dissipating or converging the light beam.
In some embodiments, the light source includes array light source.The lens include microlens array, the lenticule
Each unit in array is corresponding with the sub-light source in the array light source.
In some embodiments, the diffracted beam covers the illuminated space in the form of regular array.
In some embodiments, the diffracted beam covers the illuminated space in the form of irregular alignment.
In some embodiments, the diffracted beam covers the illuminated space in a neighboring manner.
In some embodiments, the diffracted beam covers the illuminated space in an overlapping manner.
In some embodiments, the arranging density of the diffracted beam is uneven.High order diffraction light in the diffracted beam
The arranging density of beam is more than the arranging density of Lower diffraction orders light beam.
Beneficial effects of the present invention：The present invention to light source by being configured diffraction optical element, and the diffraction optical element is expired
Foot：The angle of divergence of incident beam that the light beam of light source transmitting is formed on diffraction optical element is not less than through diffraction optics member
Angle between the neighboring diffraction light beam formed after part, so as to be replicated and be extended the light beam of light source transmitting so that outgoing
The area of light beam is much larger than the beam area of primary source transmitting, and Landfill covering fills illuminated space.The floodlighting module has
Have small, low in energy consumption, but the characteristics of emittance area is big, illumination zone is wide, is conducive to be integrated into smart machine, provide general
Optical illumination.
Description of the drawings
Fig. 1 is floodlighting module schematic diagram in one embodiment of the invention.
Fig. 2 is the floodlighting module schematic diagram for including lens in one embodiment of the invention.
Fig. 3 is focus illumination schematic diagram in one embodiment of the invention.
Fig. 4 a are regular flood light pattern schematic diagram in one embodiment of the invention.
Fig. 4 b are regular speckle patterns schematic diagram in one embodiment of the invention.
Fig. 5 a are irregular flood light pattern schematic diagram in one embodiment of the invention.
Fig. 5 b are irregular speckle patterns schematic diagram in one embodiment of the invention.
Fig. 6 is overlapping arrangement flood light pattern schematic diagram in one embodiment of the invention.
Fig. 7 is one embodiment of the invention Midst density variation arrangement flood light pattern schematic diagram.
Fig. 8 is the floodlighting module schematic diagram of the modulator containing beam shape in one embodiment of the invention.
The flood light pattern schematic diagram that Fig. 9 is formed by square beam of light in one embodiment of the invention.
Figure 10 a are the irregular flood light pattern schematic diagram that array light source is formed in one embodiment of the invention.
Figure 10 b are the irregular speckle patterns schematic diagram that array light source is formed in one embodiment of the invention.
Figure 11 is floodlight and Structured Illumination module schematic diagram in one embodiment of the invention.
Figure 12 is light source schematic diagram in one embodiment of the invention.
Figure 13 is array light source schematic diagram in one embodiment of the invention.
Figure 14 is floodlight and Structured Illumination module schematic diagram in one embodiment of the invention.
Figure 15 is imaging device schematic diagram in one embodiment of the invention.
Figure 16 is dynamic projection schematic diagram in one embodiment of the invention.
Specific embodiment
Fig. 1 is floodlighting module schematic diagram according to an embodiment of the invention.Module 10 includes light source 11, diffraction light
Element (DOE) 12 is learned, light source 11 can be the light sources such as LED, laser, for emitting the light beams such as infrared, ultraviolet, visible ray.Light source
11 launch light beam, form incident beam in the plane of incidence of DOE12, DOE12 spreads out incident beam after receiving incident beam
Broader space 13 is diffused into after penetrating to realize floodlighting, DOE12 plays the role of beam splitting, Ji Jiangdan in one embodiment
A incident beam replicates in the case where not changing essential attribute and is extended to multiple outgoing beams, and essential attribute here includes
Beam sizes, polarization direction, phase, angle of divergence etc..As shown in Figure 1, light source 11 emit light beam formed after DOE12 diffraction it is more
The outgoing beam of a order of diffraction (- 1,0,1 order diffraction light beam is only shown in figure), multiple outgoing beams illuminate space 13.
In order to achieve the purpose that floodlighting, multiple outgoing beams need basic covering to fill illuminated space 13, base mentioned here
This covering filling refers to that multiple outgoing beams need to cover space to be illuminated so that the illuminated each region in space is shone
It is bright, there is not apparent non-illuminable area, it is a kind of desirably so that the light distribution in illuminated space is basic
Uniformly, Fig. 4 (a), Fig. 5 (a), Fig. 6 and Fig. 7 are specifically referred to, without apparent gap, outgoing beam between adjacent outgoing beam
It is adjacent or overlapped.
In some embodiments, for illumination module for providing active infrared optical illumination, light source 11 can be edge emitting laser
Transmitter, vertical cavity surface laser emitter (VCSEL) etc., in contrast, beam shape, angle of divergence of different lasers etc. are deposited
It is distinguishing, therefore, according to different laser emitter types, is realizing that there is also differences, such as side for requirement of the floodlighting to DOE
The angle of divergence for emitting laser emitter is big compared with vertical cavity surface laser emitter, therefore using DOE to edge emitting Laser emission
When the light beam that device is launched is split, the angle between the light beam of adjacent diffraction orders can be set when carrying out DOE designs
It is larger.In addition, edge emitting laser emitter often emit be elliptic cross-section light beam, therefore in order to realize floodlight shine
It is bright, it can will be set smaller than when carrying out DOE designs along the angle between the adjacent diffraction orders light beam on transverse direction
Angle along ellipse short shaft direction between adjacent diffraction orders light beam.
In some embodiments, in order to carry out further modulation to light beam of light source to realize required floodlighting, also
Lens can be increased between light source and DOE.As shown in Fig. 2, lens 20 are arranged between light source and DOE, light source 11 is launched
Light beam, lens 20 reflect the light beam of light source transmitting to realize convergence, divergent beams, from the light beam that lens reflect entering in DOE
It penetrates face and forms incident beam, DOE will be diffused into object space region after receiving incident beam after incident beam progress diffraction.Lens
Can be concavees lens, convex lens etc., concavees lens are to realize the diverging of light beam, and convex lens is realizing the convergence of light beam.Such as
In one embodiment, in order to increase the distance of floodlighting, by the way that plus lens 20 is set to be incident on incident light on DOE to reduce
The sectional area of beam, while increase the luminous intensity in unit area, from there through farther space region can be irradiated to after DOE beam splitting
Domain；It can realize illumination closely by setting divergent lens 20 on the contrary.
In some embodiments, DOE incidences/emergent light can also be realized by setting the distance between light source and lens
The control of area of beam product, further controls beam intensity.By taking convex lens as an example, the distance between light source and convex lens is less than convex
In the range of the focal length of lens, the distance between light source and lens are bigger, and the beam cross section product for being incident on DOE surfaces is bigger, instead
It, the beam cross section product for being incident on DOE surfaces is smaller.Shown in Fig. 3 is focus illumination according to an embodiment of the invention
Schematic diagram.When the distance between light source and lens are not less than the focal length of lens, diffracted beam can be realized on the position of space
Collimation focuses on.With Fig. 1,2 different, what the illumination module was projected at this time will be speckle patterns light beam, should
Speckle patterns light beam can be used for carrying out structured light projection.
Speckle patterns light beam is generated other than light beam being controlled to focus on using lens, by controlling DOE beam splitting effects
It can realize.According to DOE diffraction equations：
sinθx=mxλ/Px (1)
sinθy=myλ/Py (2)
In above-mentioned equation, θx、θyIt respectively refers to along the angle of diffraction on x, y direction, mx、myIt respectively refers to along spreading out on x, y direction
Series is penetrated, λ refers to the wavelength of light beam, Px、PyRespectively refer to sizes of the DOE along the period on x, y direction, i.e. basic unit.
According to more than diffraction equation it is found that the period of the angle and basic unit on DOE of diffracted beam is inversely proportional, therefore
It is controlled when being designed to DOE by controlling the period of basic unit come the angle between neighboring diffraction light beam, generally
Ground, when the angle between neighboring diffraction light beam is more than the angle of divergence of incident beam on DOE, it is possible to see between adjacent beams
There is apparent gap, so as to separate light beam to generate speckle patterns light beam.Due to optical system, there are errors, realize
Relationship when speckle patterns illuminate between adjacent diffracted beam between angle and incident beam divergence does not need to strictly meet
Above-mentioned relation has a little discrepancy to be allowed.In addition, if incident beam is focus on light beam, it is sent out after diffraction optical element
It is constant to dissipate angle, and light beam may be speckle patterns near focussing plane, and continue to dissipate due to light beam in place farther out,
It may be such that the overlapping between light beam causes to obscure, for this situation, speckle patterns generated in the space of specific range
Angle will not strictly meet above-mentioned relation between its incident beam divergence and neighboring diffraction light beam when changing light beam.Further
Ground, incident beam divergence here more accurately can be understood as diffracted beam in a certain surface in space (formation spot figure
The surface of case) on the angle that is formed relative to diffraction optical element of the hot spot that is formed, such as the angle a in Fig. 12It is shown.Due to
The surface for forming pattern is significantly larger than the distance between diffraction optical element and light source from the distance between diffraction optical element, because
This incident beam divergence a1With angle a2It is almost equal.As angle a2During less than angle between neighboring diffraction light beam, adjacent light
There is gap between beam, speckle patterns are formed, as angle a2During not less than angle between neighboring diffraction light beam, between adjacent beams
Overlapping forms flood light pattern.It is understood, therefore, that the relationship between above-mentioned angle is to realize patterned beam (hereinafter
There is also flood beam) best illustration, as exemplary representation, other are due to slight poor caused by error or other reasons
It is different to be also contained in technical scheme of the present invention.
Fig. 4 is realization flood light pattern respectively and speckle patterns schematic diagram according to an embodiment of the invention.Fig. 4 (a) is
Diffracted beam covers filling space to realize the flood light pattern of floodlighting substantially, and Fig. 4 (b) is diffracted beam by focusing on reality
The speckle patterns of existing structured light projection.Each light beam is adjacent in flood light pattern, and illuminated space is filled in basic covering.Spot figure
There is apparent gap in case between each light beam, to form the speckle patterns independently arranged.In embodiment shown in Fig. 4, DOE will
Light beam diffraction in a manner of regularly arranged, regularly arranged advantage are flood light pattern intensity point is designed and be conducive to convenient for DOE
Cloth is more uniform, and disadvantage is that speckle patterns are unfavorable for the calculating of successive depths image.Therefore in some embodiments, by right
The design of DOE is so that being arranged as irregularly for light beam, the floodlight formed as shown in figure 5, Fig. 5 (a) is irregularly arranged by light beam
Pattern, Fig. 5 (b) are irregularly arranged the speckle patterns formed by light beam.
The more uniform acquired picture quality of intensity distribution of flood light pattern is better.In some embodiments, in order to obtain
The more uniform flood light pattern of intensity distribution, by the way that light beam is overlapped to fill illuminated space, as shown in Figure 6.Pass through
It is overlapped can be to avoid the gap between adjacent beams during arranged adjacent, so as to increase the uniformity of pattern intensity distribution.
As diffraction progression increases, the intensity of light beam can weaken, therefore in order to obtain the relatively uniform floodlight of intensity distribution
Pattern, the arranging density of light beam are set as uneven form, in one embodiment, by the row for increasing high order diffraction grade light beam
Row density obtains the relatively uniform flood light pattern of intensity distribution, as shown in Figure 7.
In some embodiments, it is also possible to by obtaining the relatively uniform figure of intensity distribution to the modulation of beam shape
Case.Fig. 8 is the illumination module schematic diagram of the modulator according to an embodiment of the invention containing beam shape.Module include light source,
Beam shape modulator 80, DOE, light source form predetermined pattern, DOE after launching light beam after the modulation of beam shape modulator 80
Illuminated space is filled after predetermined pattern is replicated to form the relatively uniform flood light pattern of beam intensity.Such as Fig. 9
In shown embodiment, beam shape is modulated squarely by beam shape modulator, can also be modulated into other embodiments
Other shapes.Beam shape modulator 80 can be comprising one kind in the optical elements such as refraction, reflection, diffraction, transmission, mask
Or combination.It is understood that all can be applied in the present invention optical element that light beam is modulated.
In some embodiments, directly the light emitting properties of light source in itself can be configured, for example changes the aperture that shines
Size and shape final pattern is modulated.For example, the light source of configuration transmitter-side light beam can be thus achieved such as Fig. 9
Shown flood light pattern.
Often power is relatively low for single source, and after the beam splitting of DOE, the energy of single light beam declines to become apparent from.For
This problem can utilize array of source.In one embodiment, by the use of VCSEL array as light source, VCSEL array exists
To arrange that multiple VCSEL light sources are formed on semiconductor base, it is specific small, low in energy consumption the advantages that.VCSEL array is launched
Array beams, array beams fill illuminated space to form flood light pattern after DOE beam splitting, as shown in Figure 10 (a).Pass through control
The factors such as the focal length of lens processed, light source and lens distance can then realize that the structure light speckle patterns as shown in Figure 10 (b) illuminate.Figure
In pattern shown in 10, dotted line frame, which is only used as, to be illustrated, and the pattern in dotted line frame is corresponding with VCSEL array light source, typically, if not
It is containing lens, then generally identical with the arrangement pattern of VCSEL array light source；If containing lens, generally with VCSEL array light source
Arrangement pattern relationship in a center of symmetry.It is understood that after substituting single light source with array light source, single dotted line frame can
It regards as " single light beam ", therefore its arrangement mode also can be similar with single light source illumination module, it both can be regularly arranged or can
With irregular alignment, both can with arranged adjacent can also overlapping arrangement, arranging density can also be different.Implementation as shown in Figure 10
In example, pass through the covering of rule, arranged adjacent realization to illuminated space between adjacent dotted line frame.
Above-described each embodiment mainly elaborate using light source and DOE realize floodlighting or Structured Illumination/
Projection generally requires same equipment and has both floodlighting and structured light projection both work(at present in some smart machines
Can, one or both of floodlighting, Structured Illumination are called when needed.Such as mobile phone, tablet, apparatus such as computer
Middle needs realize high-precision recognition of face by acquiring infrared image and depth image, thus need infrared floodlighting
And structure light depth camera.It will be apparent that independent infrared floodlight and independent structure light depth camera are integrated into equipment
In this function can be thus achieved, however thus can increase equipment cost, increase manufacturing process difficulty, particularly intelligent miniature set
It is standby, such as mobile phone, the space that can accommodate these devices be extremely limited.In order to solve this problem, the present invention will provide one kind
Have both the illumination module of floodlighting and structured light projection, can realize floodlighting and the switching of Structured Illumination or
Synchronization realizes floodlighting and Structured Illumination.
Figure 11 is floodlight according to an embodiment of the invention and Structured Illumination module schematic diagram, can realize floodlight
Illumination or Structured Illumination, can free switching therebetween.Module includes light source 111, lens 112, DOE113 and adjusting
Device 114, adjuster 114 is connected with one or more of light source 111, lens 112, DOE113 to be adjusted with realizing.Adjuster
114 are adjusted one or more of light source, lens, DOE to realize floodlighting or structure light by the control of processor
Illumination.
In some embodiments, adjuster realizes different illuminations by controlling movement, the focal length variations of lens 112,
For example adjuster includes voice coil motor, lens are zoom lens, and voice coil motor is for controlling zoom lens to carry out zoom, if currently
When focal length is more than the distance between light source and lens, light beam that lens are emitted by divergent light source, the light beam after diverging spreads out through DOE
Floodlighting is more appropriate for after penetrating；If current focus is less than the distance between light source and lens, lens are by focusing on light
Beam, the light beam after focusing can be used for Structured Illumination after DOE diffraction.Therefore, lens are controlled by using adjuster
Focal length can be so that single illumination module has floodlighting and Structured Illumination both functions.According to practical application
It needs, the required light illumination mode of current application is transmitted to adjuster with signal form, adjuster controls the focal length of lens therewith
Corresponding illumination can be thus achieved in variation.
In some embodiments, adjuster realizes different illuminations by controlling DOE.For example two kinds are configured on DOE
Different diffraction patterns is respectively used to generate floodlighting and Structured Illumination, and diffraction pattern determines that light beam is multiple after diffraction
System and the mode of extension, when the angle between adjacent diffracted beam is less than or equal to the angle of divergence of incident beam on DOE
Achievable copying beam is adjoined each other or is overlapped so as to generate floodlighting, and the angle between adjacent diffracted beam is more than
During the angle of divergence of the upper incident beams of DOE, you can to realize that copying beam is alternatively arranged to generate speckle patterns Structured Illumination.
Two kinds of diffraction patterns are configured simultaneously in same lens substrate, in actual use, according to concrete application demand (floodlighting
Or Structured Illuminations), the modes such as movement, rotation that adjuster can be by controlling DOE are by corresponding diffraction pattern and light source
It corresponds to realize floodlighting or Structured Illumination.Such as：It is divided into left and right two parts in the same plane of incidence of DOE, two parts quilt
Different diffraction patterns is configured and is respectively used to generate floodlighting and Structured Illumination, adjuster is by controlling the level of DOE
Movement is corresponding with light source by corresponding diffraction pattern.Alternatively, the two adjacent surfaces in DOE set different diffraction patterns to use respectively
In generating floodlighting and Structured Illumination, adjuster is by controlling the rotation of DOE by corresponding diffraction pattern and light source
It is corresponding.
In some embodiments, adjuster realizes different illuminations by controlling light source.It specifically refers to following to figure
12nd, 13,14 explanation.
Figure 12 is light source schematic diagram according to an embodiment of the invention.Light source by substrate 121, the first sub-light source 123 with
And second sub-light source 122 form, substrate can be semiconductor base, and the first sub-light source 123 and the second sub-light source 122 are arranged on this
In substrate, a typical light source example such as VCSEL array chip light source.The hair of first sub-light source 123 and the second sub-light source 122
A kind of difference in the attributes such as light area, beam divergence angle.In one embodiment, the light-emitting area of the second sub-light source 122 compared with
It is small, when having apparent gap between adjacent beams by being projected in space after DOE diffraction so as to fulfill Structured Illumination, first
The light-emitting area of sub-light source 123 is larger, transmitting light beam it is adjacent between adjacent beams after DOE diffraction beam splittings or overlapping with
Form flood light pattern；In some embodiments, the angle of divergence of the second sub-light source 122 transmitting light beam is smaller so that is incident on DOE
The angle of divergence of incident beam be less than angle between neighboring diffraction light beam so that have between light beam in pattern it is apparent between
Gap, so as to form speckle patterns, and the angle of divergence of the 2nd 1 light source 123 transmitting light beam is larger so that being incident on the incidence on DOE
The angle of divergence of light beam is more than the angle between adjacent beams, so that adjacent between light beam in pattern or overlapping, general so as to be formed
Light pattern.It is understood that lens can be included in the illumination module based on this light source can not also include lens, carrying out
During illumination, adjuster in module is by the independent control to sub-light sources different in light source to realize that floodlighting or structure light are shone
It is bright.In specific application, when needing to realize floodlight/Structured Illumination, the processor in equipment transfers signals to adjuster
And it controls to adjust device and is adjusted to realize floodlight/Structured Illumination.
Figure 13 is the light source schematic diagram according to this another bright embodiment.Unlike light source in Figure 12, in substrate 131
On, the first sub-light source 132 and the second sub-light source 133 are the forms of array.It is understood that it is used to implement floodlighting
It first sub-light source and is used to implement the second sub-light source of Structured Illumination and quantitatively may be the same or different；First
Sub-light source can both be separated with the second sub-light source and was uniformly distributed, can also cross-distribution.In one embodiment, only 1
One sub-light source is used for floodlighting, and utilizes multiple second sub-light sources for Structured Illumination.First light source and second light source can
It, can also be in different substrates in same substrate.
In some embodiments, the first sub-light source and the second sub-light source light source that may also be light emitting properties identical, based on this
In the illumination module of light source, carry out realizing that floodlighting and structure light are shone by the lens and light source that set different attribute
It is bright.Figure 14 is according to the floodlight of another embodiment of the invention and Structured Illumination module schematic diagram, and module is included by substrate
141st, the light source of the first sub-light source 143, the second sub-light source 142 composition, the lens being made of the first lens 145, the second lens 144
And DOE146.Here lens can also be the lenticule unit in microlens array MLA, MLA and the son in array of source
Light source corresponds to.Floodlighting, the second sub-light can be achieved via after the first lens 145 in first sub-light source 143 after DOE146 diffraction
Structured Illumination can be achieved via after the second lens 144 in source 142 after DOE146 diffraction.Adjuster in module can pass through control
Make being turned on and off come the floodlighting for realizing module or structure light photograph of the first sub-light source 143 and the second sub-light source 144
It is bright.It in some embodiments, can also be in illumination module by setting the DOE of different attribute corresponding with first and second sub-light source
To implement floodlighting and Structured Illumination.For example first DOE corresponding with the first sub-light source is being split phase to light beam
Adjacent light beam adjoining, and the corresponding 2nd DOE adjacent beams when being split to light beam of the second sub-light source have certain interval, by
This realizes floodlight and Structured Illumination, and the first DOE and the 2nd DOE here can be fabricated in same substrate.
In some embodiments, first light source and second light source in addition to attribute difference to generate floodlighting and knot respectively
Outside structure optical illumination, first light source is different from the wavelength of second light source, for example, first light source is near infrared light and second light source is remote
Infrared light.Due to wavelength difference, first light source can be opened simultaneously with second light source to realize floodlighting and structure light
The synchronous lighting of illumination.
Illumination module is illustrated above, the present invention also provides the imaging devices based on the illumination module.Figure 15
Shown is imaging device schematic diagram according to an embodiment of the invention.Device include illumination module 159, processor 153 with
And acquisition module 158, illumination module 159 illuminate space with realizing by emitting the light of certain wavelength, acquire module 158
Optical filter corresponding with the wavelength is typically contained to be imaged so as to fulfill to the light reflected by object in space.Wherein, it shines
Bright module 159 includes adjuster 154, light source 155, lens 156 and DOE157, which sends out phase in processor 153
After the illumination sign answered, by adjuster 154 realize to light source, lens, DOE it is one or more be adjusted it is corresponding to realize
Illumination, such as floodlighting or Structured Illumination.Imaging modules 158 include imaging sensor 151, lens 152, through object in space
The light of reflection is imaged on after penetrating lens 152 on imaging sensor 151, and imaging sensor 151 can be CCD or CMOS etc., figure
Processing formation image is carried out as sensor 151 converts optical signals into after electric signal to be transferred in processor 153.Acquire module
Image processor can also be included in 151, for example DSP, electric signal are formed after DSP is handled in image transmitting to processor.Place
Device 153 is managed by the control to illumination module 159 and acquisition module 158 to realize the floodlight Image Acquisition of imaging device and knot
Structure hot spot dot pattern acquires.In addition, processor 153 further can calculate depth image using speckle patterns.In a reality
It applies in example, processor can also merge with floodlight image depth image to export simultaneously comprising depth, texture information
Image.
For the situation of floodlighting and Structured Illumination synchronous lighting, multiple acquisition modules can be set with synchronous acquisition
Floodlight image and structure light image.Preferably, in single acquisition module, allow first light source and second light source pair by being configured
The optical filter of wavelength is answered, to realize synchronous acquisition floodlight and structure optical information on single image sensor, passes through later image
It handles to be partitioned into floodlight image and structure light image.
When carrying out Image Acquisition using imaging device, some problems are often encountered.Such as floodlight Image Acquisition, when
When the light beam identical with optical source wavelength is equally existed in ambient light, and ambient light variation it is apparent when, then influence whether floodlight image
Acquisition；Depth image is acquired for another example, when the change in depth of target is apparent, the spot size at target different depth
Difference can equally influence subsequent depth image computational accuracy.The present invention provides a kind of imaging device based on dynamic lighting.It should
Imaging device can be realized：Dynamic projection under floodlighting, dynamic projection and floodlighting and knot under Structured Illumination
The switching at runtime projection of structure illumination central bay.
Figure 16 is dynamic projection schematic diagram according to an embodiment of the invention.By taking the projection of structure light speckle patterns as an example
(being equally applicable to floodlighting) in using module acquisition image process is acquired, is controlled by processor in illumination module
One or more of light source, lens, DOE are to realize dynamic lighting, in one embodiment, processor by control to adjust device with
It realizes dynamic lighting, so as to acquire multiple image, finally collected multiple image is merged by processor to generate one
The image of panel height quality.
In one embodiment, adjuster is used to control the focal length of lens, so as to being carried out in object space different distance
Focusing, and acquires corresponding image simultaneously, for example, in Figure 16 in different distance the image collected 161,162,163, image
In near the plane where the part on target object is placed exactly in current focus when, project spot on the part the most
It concentrates, corresponding speckle contrast's degree highest (such as spot 166) in acquired image, without pair of the spot in focal length plane
(such as spot 165) then more relatively low than degree.After multiple image is collected, pass through the identification to speckle patterns and blending algorithm
The image 164 of single width high quality can be obtained.
In one embodiment, device can also be controlled to adjust using processor in single-frame images collection period to be adjusted
Section, i.e., within the time for exposure of single-frame images, illumination module constantly changes its illumination condition, thus acquired image relative to
Unique illumination possesses better image quality.Compared to above-mentioned frames fusion mode, this mode is follow-up without carrying out
It calculates.Such as floodlighting, in above example replicate and extension light beam by way of cover the illuminated space of filling
Lighting system, since the intensity distribution between the intensity distribution and light beam of single light beam is difficult to realize substantially uniformity, because
The effect of this floodlighting is unable to reach most preferably, therefore when carrying out floodlighting, in the single frame exposure period of imaging sensor
It is interior, the variation of the factors such as the focal length of lens, light source power in illumination module is controlled using processor so that strong in illuminated space
Dynamic change occurs for degree, can improve the problem of intensity of illumination as caused by single illumination is unevenly distributed.In addition, for structure
For optical illumination, the focusing problem of target in space in different distance is equally faced, i.e., distance is different, between the contrast of spot
Variant, contrast difference is larger in collected structure light image under single lighting condition.For this problem, equally may be used
Within the single frame exposure period of imaging sensor, the variation of the factors such as focal length of lens in illumination module is controlled using processor,
To increase the contrast of spot in the structure light image finally acquired.
The above content is combine specific/preferred embodiment further description made for the present invention, it is impossible to recognize
The specific implementation of the fixed present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs,
Without departing from the inventive concept of the premise, some replacements or modification can also be made to the embodiment that these have been described,
And these are substituted or variant should all be considered as belonging to protection scope of the present invention.
Claims (10)
1. a kind of floodlighting module, which is characterized in that including：
Light source, for emitting light beam；
Diffraction optical element replicates and extends the light beam to cover the illuminated space of filling；
The angle of divergence for the incident beam that the light beam is formed on diffraction optical element is not less than after the diffraction optical element
Angle between the neighboring diffraction light beam of formation.
2. floodlighting module as described in claim 1, which is characterized in that further include lens, the lens are located at the light
Between source and the diffraction optical element, for dissipating or converging the light beam.
3. floodlighting module as described in claim 1, which is characterized in that the light source includes array light source.
4. floodlighting module as claimed in claim 3, which is characterized in that the lens include microlens array, described micro-
Each unit in lens array is corresponding with the sub-light source in the array light source.
5. floodlighting module as described in any one of claims 1-3, which is characterized in that the diffracted beam is with regular array shape
Formula covers the illuminated space.
6. floodlighting module as described in any one of claims 1-3, which is characterized in that the diffracted beam is with irregular alignment
Form covers the illuminated space.
7. floodlighting module as described in any one of claims 1-3, which is characterized in that the diffracted beam is in a neighboring manner
Cover the illuminated space.
8. floodlighting module as described in any one of claims 1-3, which is characterized in that the diffracted beam is in an overlapping manner
Cover the illuminated space.
9. floodlighting module as described in any one of claims 1-3, which is characterized in that the arranging density of the diffracted beam is not
Uniformly.
10. floodlighting module as claimed in claim 9, which is characterized in that high order diffraction light beam in the diffracted beam
Arranging density is more than the arranging density of Lower diffraction orders light beam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810037174.3A CN108132573A (en) | 2018-01-15 | 2018-01-15 | Floodlighting module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810037174.3A CN108132573A (en) | 2018-01-15 | 2018-01-15 | Floodlighting module |
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| CN108132573A true CN108132573A (en) | 2018-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810037174.3A Pending CN108132573A (en) | 2018-01-15 | 2018-01-15 | Floodlighting module |
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