CN108332082A - Illumination module - Google Patents
Illumination module Download PDFInfo
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- CN108332082A CN108332082A CN201810036240.5A CN201810036240A CN108332082A CN 108332082 A CN108332082 A CN 108332082A CN 201810036240 A CN201810036240 A CN 201810036240A CN 108332082 A CN108332082 A CN 108332082A
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- light source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
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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
- F21V19/00—Fastening of light sources or lamp holders
-
- 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
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
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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
-
- 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
- F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
- F21V5/004—Refractors for light sources using microoptical elements for redirecting or diffusing light using microlenses
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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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
The present invention provides a kind of illumination module, including：Light source, for emitting light beam；Lens, for dissipating or converging the light beam；Diffraction optical element replicates and extends the light beam to illuminated space；Processor is connected and is controlled one or more to realize floodlighting or Structured Illumination in the light source, lens, diffraction optical element.By one or more in processor adjusting light source, lens, diffraction optical element, to meet the condition of floodlighting or Structured Illumination, to realize floodlighting or Structured Illumination.Floodlighting and structured light projection both functions are fused in a module by the illumination module, can at any time be switched to realize floodlighting or Structured Illumination as needed, and have the characteristics that small, low in energy consumption, are conducive to be integrated into smart machine.
Description
Technical field
The present invention relates to field of semiconductor illumination more particularly to a kind of illumination modules.
Background technology
Visual information is increasingly becoming the important channel that smart machine obtains information, perceives 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, being based on people
The unlock of face identification the functional requirements such as interacts with payment, based on the gesture of human body information with acting, while these functions also need
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 utilizing depth camera 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, utilizing 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 bringing some problems.Being miniaturized of smart machine, lightening trend makes
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 illumination module, by floodlighting and structured light projection both
Function is fused in a module, can be switched at any time as needed to realize floodlighting or Structured Illumination, and have volume
Advantage small, low in energy consumption.
Illumination module provided by the invention, including：Light source, for emitting light beam；Lens, for dissipating or converging the light
Beam；Diffraction optical element replicates and extends the light beam to illuminated space；Processor, connect and control the light source, thoroughly
It is one or more to realize floodlighting or Structured Illumination in mirror, diffraction optical element.
In some embodiments, the lens are zoom lens, and the focal length that the processor is used to control the lens becomes
Change to realize floodlighting or Structured Illumination.
In some embodiments, the diffraction optical element includes the first diffraction pattern and the second diffraction pattern, through described
Angle between the neighboring diffraction light beam formed after first diffraction pattern diffraction is not more than the angle of divergence of incident beam, general to realize
Optical illumination；Angle between the neighboring diffraction light beam formed after the second diffraction pattern diffraction is more than the diverging of incident beam
Angle, to realize Structured Illumination.
In some embodiments, the light source includes the first sub-light source and the second sub-light source, and the processor controls institute
It states the first sub-light source and emits the first beamlet, first beamlet is covered after the diffraction optical element replicates and extends and filled out
The illuminated space is filled to realize floodlighting；The adjuster controls second sub-light source and emits the second beamlet, institute
It states the second beamlet and forms speckle patterns Structured Illumination after the diffraction optical element replicates and extends.The light source packet
Array light source is included, the array light source includes substrate, and first sub-light source is arranged with second sub-light source in the substrate
On.First sub-light source is different from one or more of the light-emitting area of the second sub-light source, the angle of divergence, quantity attribute.Institute
It is microlens array to state lens, and the lenticule unit in the microlens array is corresponding with the sub-light source.
The present invention also provides a kind of imaging device, including illumination module as described above, for providing floodlighting or knot
Structure optical illumination；Imaging sensor and processor, the processor are connect with the illumination module and described image sensor, and
It controls the illumination module and acquires floodlight image using imaging sensor under floodlighting, and the control illumination module exists
Under Structured Illumination structure light image is acquired using imaging sensor.
In some embodiments, the processor calculates depth image based on the structure light image.The processor
For merging the depth image and the floodlight image.Beneficial effects of the present invention：The present invention adjusts light by processor
It is one or more in source, lens, diffraction optical element, to meet the condition of floodlighting or Structured Illumination, to realize
Floodlighting or Structured Illumination.Floodlighting and structured light projection both functions are fused to a mould by the illumination module
In group, can at any time switch to realize floodlighting or Structured Illumination as needed, and have the characteristics that it is small, low in energy consumption,
Be conducive to be integrated into smart machine.
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 variable density arrangement flood light pattern schematic diagram in one embodiment of the invention.
Fig. 8 is the floodlighting module schematic diagram of the modulator containing beam shape in one embodiment of the invention.
Fig. 9 is that square beam of light is formed by flood light pattern schematic diagram 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 implementation mode
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 light.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 in one embodiment, i.e., will be single
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 arranged 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, the angle between the adjacent diffraction orders light beam on transverse direction can be set smaller than when carrying out DOE designs
Angle along ellipse short shaft direction between adjacent diffraction orders light beam.
In some embodiments, it in order to carry out further modulation to light beam of light source to realize required floodlighting, goes back
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, light beam the entering in DOE reflected from lens
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, incident light on DOE is incident on to reduce by the way that plus lens 20 is arranged
The sectional area of beam, while increasing the luminous intensity in unit area, from there through farther space region can be irradiated to after DOE beam splitting
Domain；It can realize the illumination of short distance by the way that divergent lens 20 is arranged on the contrary.
In some embodiments, DOE incidences/emergent light can also be realized by the way that the distance between light source and lens is arranged
The control of area of beam product, further controls beam intensity.By taking convex lens as an example, it is less than at a distance from light source is between convex lens 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 the surfaces DOE is bigger, instead
It, the beam cross section product for being incident on the surfaces DOE 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.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 controlling light beam focusing using lens, passes through and controls DOE beam splitting effects
It may be implemented.According to DOE diffraction equations：
sinθx=mxλ/Px (1)
sinθy=myλ/Py (2)
In above-mentioned equation, θx、θyRespectively refer to the angle of diffraction on the direction x, y, mx、myRespectively refer to spreading out on the direction x, y
Series is penetrated, λ refers to the wavelength of light beam, Px、PyRespectively refer to periods of the DOE on the direction x, y, the i.e. size of basic unit.
According to the above 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 come the angle between neighboring diffraction light beam when being designed to DOE by controlling the period of basic unit, generally
Ground, when the angle between neighboring diffraction light beam is more than the angle of divergence of incident beam on DOE, so that it may to see between adjacent beams
There is apparent gap, to separate light beam to generate speckle patterns light beam.Since there are errors for optical system, realize
Relationship of speckle patterns when illuminating 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 hot spot that is formed be formed by angle relative to diffraction optical element, 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 a2When less than angle between neighboring diffraction light beam, adjacent light
There is gap between beam, speckle patterns is formed, as angle a2When 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
It is diffracted beam by focusing with reality that diffracted beam covers filling space to realize the flood light pattern of floodlighting, Fig. 4 (b) substantially
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 that 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 light beam is irregular, as shown in figure 5, Fig. 5 (a) is that irregularly arrangement is formed by floodlight to light beam
Pattern, Fig. 5 (b) are that irregularly arrangement is formed by speckle patterns to 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 when arranged adjacent, 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
The arranging density of pattern, light beam is 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 obtain the relatively uniform figure of intensity distribution by the modulation to 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
Shown in 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 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 in 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, using 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, as shown in Figure 10 (a) after DOE beam splitting.Pass through control
The factors such as the focal length of lens, light source and lens distance processed then may be implemented the structure light speckle patterns as shown in Figure 10 (b) and illuminate.Figure
In pattern shown in 10, dotted line frame is only used as signal, and the pattern in dotted line frame is corresponding with VCSEL array light source, typically, if not
It is containing lens, then generally identical as 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, the covering between adjacent dotted line frame by rule, arranged adjacent realization to illuminated space.
Above-described each embodiment mainly elaborate using light source and DOE realize floodlighting or Structured Illumination/
Projection generally requires the 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
It is middle to need to 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, especially 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
Floodlighting and the switching of Structured Illumination may be implemented in the illumination module for having both floodlighting and structured light projection, or
Synchronization realizes floodlighting and Structured Illumination.
Figure 11 is floodlight according to an embodiment of the invention and Structured Illumination module schematic diagram, and floodlight may be implemented
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 by processor control by one or more of light source, lens, DOE being adjusted to realize floodlighting or knot
Structure optical 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 carries out zoom for controlling zoom lens, if currently
When focal length is more than the distance between light source and lens, the 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 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 adjoins each other or is overlapped to generate floodlighting, and the angle between adjacent diffracted beam is more than
When 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), adjuster can be by controlling the modes such as movement, rotation of DOE 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 to be respectively used to generate floodlighting and Structured Illumination, the level that adjuster passes through control DOE
Movement is corresponding with light source by corresponding diffraction pattern.Alternatively, the two adjacent surfaces in DOE are arranged different diffraction patterns and 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
12,13,14 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 is with the setting of the second sub-light source 122 at 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 to realize Structured Illumination, first
The light-emitting area of sub-light source 123 is larger, transmitting light beam via 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 the angle between neighboring diffraction light beam so that have between light beam in pattern it is apparent between
Gap, 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 to be formed
Light pattern.It is understood that can include that lens can not also carried out comprising lens in the illumination module based on this light source
When illumination, the adjuster in module is by the independent control to different sub-light sources 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 for realizing floodlighting
It first sub-light source and quantitatively may be the same or different for realizing the second sub-light source of Structured Illumination；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 the same substrate.
In some embodiments, the first sub-light source and the second sub-light source can also be the identical light source of light emitting properties, based on should
In the illumination module of light source, carried out by lens and light source that different attribute is arranged to realize that floodlighting and structure light are shone
It is bright.Figure 14 is according to the floodlight and Structured Illumination module schematic diagram of another embodiment of the invention, and module includes by substrate
141, 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 microlens array MLA, the lenticule unit in 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
It makes the first sub-light source 143 and being turned on and off for the second sub-light source 144 is shone come the floodlighting for realizing module or structure light
It is bright.It in some embodiments, can also be corresponding with the first and second sub-light source by the way that the DOE of different attribute is arranged in illumination module
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 are 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 in be 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 the light reflected by object in space to realize.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
It can also be formed in image transmitting to processor after DSP is handled comprising image processor, such as DSP, electric signal in 151.Place
Reason device 153 realizes the floodlight Image Acquisition and knot of imaging device by the control to illumination module 159 and acquisition module 158
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, it includes depth, texture information simultaneously that processor, which can also merge depth image to export with floodlight image,
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 individually acquisition module, allow first light source and second light source pair by configuring
The optical filter for answering wavelength passes through later image to realize synchronous acquisition floodlight and structure optical information on single image sensor
Processing is 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 equally existing light beam identical with optical source wavelength 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 may be implemented：Dynamic projection under floodlighting, the dynamic projection and floodlighting under Structured Illumination and knot
The switching at runtime of structure illumination central bay projects.
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) is controlled by processor in illumination module in using acquisition module acquisition image process
One or more of light source, lens, DOE are to realize dynamic lighting, in one embodiment, processor by control to adjust device with
Realize that dynamic lighting finally merges to generate one collected multiple image by processor to acquire multiple image
The image of panel height quality.
In one embodiment, adjuster is used to control the focal length of lens, 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 collecting multiple image, pass through 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 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 specific/preferred embodiment further description made for the present invention is combined, cannot 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 all shall be regarded as belonging to protection scope of the present invention.
Claims (10)
1. a kind of illumination module, which is characterized in that including：
Light source, for emitting light beam；
Lens, for dissipating or converging the light beam；
Diffraction optical element replicates and extends the light beam to illuminated space；
Processor, connect and control in the light source, lens, diffraction optical element it is one or more with realize floodlighting or
Structured Illumination.
2. illumination module as described in claim 1, which is characterized in that the lens are zoom lens, and the processor is used for
The focal length variations of the lens are controlled to realize floodlighting or Structured Illumination.
3. illumination module as described in claim 1, which is characterized in that the diffraction optical element include the first diffraction pattern with
Second diffraction pattern, the angle between the neighboring diffraction light beam formed after the first diffraction pattern diffraction are not more than incident light
The angle of divergence of beam, to realize floodlighting；Folder between the neighboring diffraction light beam formed after the second diffraction pattern diffraction
Angle is more than the angle of divergence of incident beam, to realize Structured Illumination.
4. illumination module as described in claim 1, which is characterized in that the light source includes the first sub-light source and the second sub-light
Source, the processor control first sub-light source and emit the first beamlet, and first beamlet is through diffraction optics member
Covering fills the illuminated space to realize floodlighting after part is replicated and extended；The adjuster controls second sub-light
Source emits the second beamlet, and second beamlet forms speckle patterns knot after the diffraction optical element replicates and extends
Structure optical illumination.
5. illumination module as claimed in claim 4, which is characterized in that the light source includes array light source, the array light source
Including substrate, first sub-light source is arranged on the substrate with second sub-light source.
6. illumination module as claimed in claim 4, which is characterized in that the light-emitting surface of first sub-light source and the second sub-light source
One or more of product, the angle of divergence, quantity attribute is different.
7. illumination module as claimed in claim 4, which is characterized in that the lens are microlens array, the lenticule battle array
Lenticule unit in row is corresponding with the sub-light source.
8. a kind of imaging device, which is characterized in that including：
Illumination module as described in claim 1~7 is any, for providing floodlighting or Structured Illumination；
Imaging sensor and processor, the processor is connect with the illumination module and described image sensor, and is controlled
The illumination module acquires floodlight image, and the control illumination module in structure under floodlighting using imaging sensor
Under optical illumination structure light image is acquired using imaging sensor.
9. illumination module as claimed in claim 8, which is characterized in that the processor is calculated based on the structure light image
Depth image.
10. illumination module as claimed in claim 9, which is characterized in that the processor for merge the depth image with
And the floodlight image.
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