CN110275313A - A kind of the speckle inhibition device and laser light projection display system of static state - Google Patents
A kind of the speckle inhibition device and laser light projection display system of static state Download PDFInfo
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- CN110275313A CN110275313A CN201910671441.7A CN201910671441A CN110275313A CN 110275313 A CN110275313 A CN 110275313A CN 201910671441 A CN201910671441 A CN 201910671441A CN 110275313 A CN110275313 A CN 110275313A
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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
- G02B27/12—Beam splitting or combining systems operating by refraction only
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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
- G02B27/48—Laser speckle optics
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
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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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/206—Control of light source other than position or intensity
Abstract
This application provides a kind of speckles of static state to inhibit device, and it includes: laser, collimation lens, refraction optical element and multimode lightguide component that the speckle, which inhibits device, and the multimode lightguide component includes that optics is coupled into end and multimode lightguide；Wherein, the laser is for issuing laser beam；The collimation lens is for carrying out collimation processing to the laser beam；The refraction optical element is divided into multi beam for the laser beam that will collimate that treated and is parallel to each other the sub- laser beam with different optical path delay；The sub- laser beam that the multimode lightguide component is used to that multi beam to be made to be parallel to each other spatially is overlapped.The speckle inhibits device that single laser beam is spatially divided into multiple sub- laser beams by refraction optical element, to destroy the spatial coherence of laser, and the purpose for reducing speckle is realized by sub- laser beam in space overlapping in conjunction with the multiple total internal reflection of multimode lightguide.The speckle inhibits device to have many advantages, such as that structure is simple and drives without motor.
Description
Technical field
The present invention relates to technical field of laser display, inhibit device more specifically to a kind of speckle of static state and swash
Light projection display system.
Background technique
Laser light source was widely used in laser display and interior peeps due to the advantages that its color is pure, brightness is high and the service life is long
The fields such as mirror illumination.After laser is by scattering from rough surface, due to the very strong temporal coherence of laser and spatial coherence, it can generate
The graininess light distribution of light and shade distribution, referred to as speckle.The strong and weak journey of speckle effect is usually measured with speckle contrast C
Degree:
Wherein, σIWithIt is the standard deviation and average value of Speckle Intensity respectively, speckle contrast C is higher, and speckle effect is tighter
Weight.
Currently, main speckle suppression technology was produced within the time of integration of light intensity detector (such as human eye and camera)
Raw different speckle picture (such as rotation diffusion sheet), is then superimposed, to realize the purpose of speckle reduction by time domain.
But the technological means is needed using the driving devices such as mechanical motor, is had and is needed external power supply and structure is complicated
The disadvantages of.
Summary of the invention
In view of this, to solve the above problems, the speckle that the present invention provides a kind of static state inhibits device and laser projection aobvious
Show that system, technical solution are as follows:
A kind of speckle inhibition device of static state, it includes: laser, collimation lens, refractive optics that the speckle, which inhibits device,
Element and multimode lightguide component；
Wherein, the laser is for issuing laser beam；
The collimation lens is for carrying out collimation processing to the laser beam；
The refraction optical element is divided into multi beam for the laser beam that will collimate that treated and is parallel to each other with different light paths
The sub- laser beam of delay；
The sub- laser beam that the multimode lightguide component is used to that multi beam to be made to be parallel to each other spatially is overlapped；
The multimode lightguide component includes: that optics is coupled into end and multimode lightguide；
The optics is coupled into the input terminal that end is located at the multimode lightguide.
Preferably, inhibit in device in above-mentioned speckle, it is engineering diffuser, the multimode lightguide that the optics, which is coupled into end,
For light siphunculus；
Wherein, the refraction optical element is transmission-type refraction optical element；
The sub- laser scattering beam that the engineering diffuser is used to for multi beam being parallel to each other is the sub- laser of different angle
Beam；
The smooth siphunculus is for making the sub- laser beam of different angle carry out total internal reflection inside the smooth siphunculus.
Preferably, inhibit in device in above-mentioned speckle, the angle of scattering of the engineering diffuser is less than connecing for the smooth siphunculus
Receive angle.
Preferably, inhibit in device in above-mentioned speckle, it is convergent lens that the optics, which is coupled into end, and the multimode lightguide is
Multimode fibre；
Wherein, the refraction optical element is transmission-type refraction optical element；
The size reduction for the sub- laser beam that the convergent lens is used to for multi beam being parallel to each other；
The multimode fibre is used to that the sub- laser beam after size reduction to be made to carry out inside the multimode fibre in complete
Reflection.
Preferably, above-mentioned speckle inhibit device in, the optics be coupled into end be spectroscope and engineering diffuser, it is described more
Mould optical waveguide is light siphunculus；
Wherein, the refraction optical element is reflective refraction optical element；
Treated that laser beam passes through the spectroscope first is incident to the refraction optical element for collimation；
The refraction optical element is used to laser beam being divided into multi beam and be parallel to each other the sub- laser with different optical path delay
Beam, and reflex to the spectroscope；
The sub- laser beam that the spectroscope is used to for multi beam being parallel to each other reflexes to the engineering diffuser；
The sub- laser scattering beam that the engineering diffuser is used to for multi beam being parallel to each other is the sub- laser of different angle
Beam；
The smooth siphunculus is for making the sub- laser beam of different angle carry out total internal reflection inside the smooth siphunculus.
Preferably, inhibit in device in above-mentioned speckle, treated that laser beam passes through the spectroscope first for the collimation
It is incident to the refraction optical element, comprising:
The optical path angle at 45 ° of the spectroscope and collimation treated laser beam is arranged, so that collimation treated laser
Beam is incident to the spectroscope with 45° angle；
The optical path of the refraction optical element and collimation treated laser beam is arranged at an angle of 90, so as to pass through described point
The laser beam of light microscopic is incident to the refraction optical element with 90 ° of angles.
Preferably, inhibit in device in above-mentioned speckle, the refraction optical element back is coated with high reflecting metal film.
Preferably, inhibit in device in above-mentioned speckle, the refraction optical element is the step-like light of one-dimensional square arrangement
Learn the space overlapping of structure or two kinds of one-dimensional step-like optical textures or the step-like optical texture of two-dimensional directional arrangement.
Preferably, inhibit in device in above-mentioned speckle, the step-like optical texture is by transparent glass or transparent plastic
It is made.
Preferably, inhibit in device in above-mentioned speckle, the material of the transparent glass is N-BK7 optical glass；
The material of the transparent plastic is PMMA material.
Preferably, inhibit in device in above-mentioned speckle, difference in height is set at random between the step of the step-like optical texture.
Preferably, inhibit in device in above-mentioned speckle, the step surface of the step-like optical texture is plane or curved surface.
Preferably, inhibit in device in above-mentioned speckle, the light path that the speckle inhibits device to introduce the sub- laser beam
Delay be less than or equal to or greater than laser coherence length.
A kind of laser light projection display system, the laser light projection display system include: speckle suppression described in any of the above embodiments
Device, relay lens, micro display chip, projection lens and screen processed；
Wherein, the speckle inhibits device to be used to export the speckle light field after being suppressed；
The relay lens is used to the speckle light field after the inhibition illuminating the micro display chip；
The micro display chip is for generating image information；
The projection lens is used for described image information amplification imaging to the screen.
Compared to the prior art, what the present invention realized has the beneficial effect that
The speckle inhibits device by introducing refraction optical element, single laser beam is spatially divided into multiple with not
With the sub- laser beam of optical path delay, to destroy the spatial coherence of laser, and the multiple complete interior of multimode lightguide is combined
Reflection realizes the purpose for reducing speckle by sub- laser beam in space overlapping.
The speckle inhibits device to have many advantages, such as that structure is simple and drives without motor.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structural schematic diagram that a kind of speckle provided in an embodiment of the present invention inhibits device；
Fig. 2 is the structural schematic diagram that another speckle provided in an embodiment of the present invention inhibits device；
Fig. 3 is the speckle schematic diagram that sub- laser beam provided in an embodiment of the present invention is 1；
Fig. 4 is the speckle schematic diagram that sub- laser beam provided in an embodiment of the present invention is 36；
Fig. 5 is the structural schematic diagram that another speckle provided in an embodiment of the present invention inhibits device；
Fig. 6 is the structural schematic diagram that another speckle provided in an embodiment of the present invention inhibits device；
Fig. 7 is a kind of structural schematic diagram of laser light projection display system provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Multimode lightguide such as light siphunculus (also referred to as optical tunnel or photoconductive tube) and multimode fibre are the common components in optics.
Light siphunculus is mainly used in Projection Display, realizes beam homogenization.It can be divided into solid light siphunculus and hollow light is logical from structure
Pipe.
Solid light siphunculus is will to be incident on the light inside light siphunculus through excessive using the total internal reflection principle of the materials such as glass
Secondary total internal reflection generates Optical Field Superposition, realizes even light.
Hollow smooth siphunculus is coated with high reflecting metal film by its inner wall, will be incident on light using the high reflecting metal film of inner wall
Light beam multiple reflections inside siphunculus generate Optical Field Superposition, realize even light.
Multimode fibre is generally made of the covering of the fibre core of high refractive index and low-refraction, within the scope of fiber optic acceptance angle,
Light experiences total internal reflection in fibre core is coupled, realizes the low-loss transmission purpose of light.
It is existing the study found that increasing the mode dispersion (model dispersion) of multimode fibre can inhibit multimode fibre and goes out
The laser speckle of mouth.By taking step optical fiber as an example, maximum time delay of the incident light in step optical fiber is writeable are as follows:
Wherein, Δ τ is maximum time delay in step optical fiber, and l is the length of step optical fiber, n1And n2Respectively step light
The refractive index of long and slender core and covering, c are the light velocity of light in a vacuum.
The numerical aperture NA=n of step optical fiber1(2Δ)1/2, formula (2) can further be written as:
By formula (3) it is found that the increase of numerical aperture NA and length l with step optical fiber, couple light in step light
Maximum time delay Δ τ in fibre becomes larger.If coupling light is single longitudinal mode laser, the speckle in step optical fiber exit is compared
Degree are as follows:
Wherein, Δ λ is the peak half breadtgh of single longitudinal mode laser, and λ is the central wavelength of single longitudinal mode laser.
Therefore, when the maximum time delay Δ τ when light in step optical fiber becomes larger, the speckle comparison in step optical fiber exit
Spending C reduces, i.e. the numerical aperture NA and length l of increase step optical fiber can realize the purpose that speckle inhibits.
In the prior art, time and the spatial coherence of laser light source are reduced by diffraction optical device and multimode lightguide
Property, realize that speckle inhibits.That is, the laser after collimated after diffraction optical device, generates high order diffraction, is then coupled into more
Mould optical waveguide realizes that speckle inhibits.The working principle of the technology is that the angle of divergence of laser is made to become larger, and increases multimode lightguide
The diffracted beam of effective numerical aperture, i.e., different diffraction progressions generates different time delays, such as time after multimode lightguide
Delay is greater than the coherence time of laser, then the temporal coherence of laser reduces, and achievees the purpose that speckle contrast reduction.
According to Fresnel reflection formula, two kinds of dielectric refractive index are respectively n1And n2, they are by planar interface point
It opens, from the incidence of 1 side of medium, at interface reflection and refraction occur for directional light, we are (parallel incident by p electric vector in light beam
Face) and s (vertical incidence face) decomposed, obtain the formula of reflectivity and transmissivity:
Wherein, rpAnd rsThe respectively reflectance formula of p light and s light, tpAnd tsRespectively the transmissivity of p light and s light is public
Formula.
By taking glass as an example, refractive index n2=1.5, in glass surface, reflectivity is normal incidence light from air
4%, transmissivity 96%.When incidence angle increases, the transmissivity of light can reduce, and reflectivity will increase.
Therefore, above-mentioned technological means by diffraction optical element increase the more waveguides of multimode effective numerical aperture, air and
The interface reflection of optical waveguide fibre core will cause additional light loss.Also, when incidence angle increases to connecing greater than multimode lightguide
When receiving angle, incident light is not able to satisfy the condition of the total internal reflection inside multimode lightguide, can from multimode lightguide sidewall leakage, into
One step increases light loss.
In the prior art, diffusion sheet is also rotated by using motor, in conjunction with light siphunculus, realizes the even light of laser beam and dissipate
Spot is eliminated.Its particular technique means receives light beam with truncated cone-shaped light siphunculus, and incident light is being exported in light siphunculus multiple reflection inside
Place forms annulus shaped laser spot.After outgoing beam is scattered via motor-driven rotation diffusion sheet, scattered beam is incident on prismatic table shape
Light siphunculus incidence end, after light siphunculus multiple reflection inside, shaping is rectangular.The quick rotation of diffusion sheet, produces different moments
Raw different speckle pictures inhibit speckle after superposition because of the visual persistence effect (or time for exposure of camera) of human eye.
But technological means the disadvantages of needing external power supply and complicated system structure there are motor.
In order to solve the problems in the existing technology, the speckle provided by the present application inhibits device by introducing refraction light
Element is learned, single laser beam is spatially divided into multiple sub- laser beams with different optical path delay, to destroy laser
Spatial coherence, and combine the multiple total internal reflection of multimode lightguide, by sub- laser beam in space overlapping, realize to reduce and dissipate
The purpose of spot.The speckle inhibits device to have many advantages, such as that structure is simple and drives without motor.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
With reference to Fig. 1, Fig. 1 is the structural schematic diagram that a kind of speckle provided in an embodiment of the present invention inhibits device.
It includes: laser 1, collimation lens 2, refraction optical element 3 and multimode lightguide component that the speckle, which inhibits device,
4；
Wherein, the laser 1 is for issuing laser beam；
The collimation lens 2 is for carrying out collimation processing to the laser beam；
The refraction optical element 3 is divided into multi beam for the laser beam that will collimate that treated and is parallel to each other with different light paths
The sub- laser beam of delay；
The sub- laser beam that the multimode lightguide component 4 is used to that multi beam to be made to be parallel to each other spatially is overlapped；
The multimode lightguide component 4 includes: that optics is coupled into end and multimode lightguide；
The optics is coupled into the input terminal that end is located at the multimode lightguide.
In this embodiment, laser coherence is reduced by refraction optical element 3 and multimode lightguide component 4, realizes and dissipates
Spot inhibits.The temporal coherence of laser can pass through coherence time τcWith coherence length LcIt indicates:
Wherein, Δ λ is the full width at half maximum (FWHM) of laser, and λ is the central wavelength of laser, and c is the light velocity of laser in a vacuum.
Laser Time coherence can be characterized by Michelson interference experiment, when an arm of Michelson's interferometer moves
When dynamic length is more than or equal to the coherence length of laser, the striped in interference pattern disappears, and fringe visibility zero, two-beam becomes
Incoherent light.Therefore, the coherence length of laser is larger than by changing optical path delay between two-beam or time delay
Or coherence time, the temporal coherence of laser can be reduced in this way.
Refraction optical element is three-dimensional optical structure in the application, can be the step-like optics knot of one-dimensional square arrangement
The step-like optical texture of space overlapping or the two-dimensional directional arrangement of structure or two kinds of one-dimensional step-like optical textures.
Specifically, difference in height is set at random between the step of the step-like optical texture, the difference in height between step can phase
Deng can also be unequal.
Also, the step surface of the step-like optical texture is plane or curved surface.That is, the difference in height variation between step can be with
It is step, is also possible to continuous.
By etc. step heights difference transmission-type refraction optical element for, as step height difference be Δ h, numbers of steps M,
For laser via M beam laser beam is divided into after the refraction optical element, the optical path delay between sub- laser beam is writeable are as follows:
Δ L=(n2-n1)Δh (8)
Wherein, Δ L is the optical path delay that the refraction optical element step introduces, n1And n2Respectively air and the folding
Penetrate the refractive index of optical element.
The refraction optical element is produced on transparent glass or transparent plastic material, the transparent glass or transparent plastic
Refer to the material transparent to the visible light wave range including red, green, blue.
Optionally, the transparent glass material includes but is not limited to N-BK7 optical glass, the transparent plastic material packet
It includes but is not limited to PMMA (polymethyl methacrylate).
The speckle provided by the present application inhibits device by introducing refraction optical element, and single laser beam is spatially divided
For multiple sub- laser beams with different optical path delay, to destroy the spatial coherence of laser, and multimode light wave is combined
The multiple total internal reflection led realizes the purpose for reducing speckle by sub- laser beam in space overlapping.The speckle inhibits device to have knot
The advantages that structure is simple and drives without motor.
Further, it is based on the above embodiment of the present invention, with reference to Fig. 2, Fig. 2 is provided in an embodiment of the present invention another scattered
The structural schematic diagram of spot inhibition device.
It is engineering diffuser 4.1 that the optics, which is coupled into end, and the multimode lightguide is light siphunculus 4.2；
Wherein, the refraction optical element 3 is transmission-type refraction optical element 3.1；
The engineering diffuser 4.1 is used to swash the son that the sub- laser scattering beam that multi beam is parallel to each other is different angle
Light beam；
The smooth siphunculus 4.2 is for carrying out the sub- laser beam of different angle inside the smooth siphunculus 4.2 in complete
Reflection.
In this embodiment, the laser beam that laser 1 is emitted vertical incidence to transmission-type after the collimation of collimation lens 2 is rolled over
It penetrates on optical element 3.1, by the even light of engineering diffuser 4.1 and light siphunculus 4.2, as the even light for inhibiting function with speckle
Lighting source.It is assumed that laser beam is divided into M=6 beam laser beam after the transmission-type refraction optical element 3.1, by the M
The spatial distribution for the speckle light field that=6 beam laser beams generate is separated from each other, M=6 on the direction of propagation perpendicular to light
The speckle light field that beam laser beam generates is not superimposed spatially, and subjective speckle is not suppressed at this time.
However, when M=6 beam laser beam impinges perpendicularly on engineering diffuser 4.1, and pass through inside light siphunculus 4.2
Multiple reflections, the speckle light field that M=6 beam laser beam generates carry out space overlapping in the exit of the smooth siphunculus, dissipate at this time
Spot can be suppressed.
It is the speckle schematic diagram that sub- laser beam provided in an embodiment of the present invention is 1 with reference to Fig. 3, Fig. 3, is with reference to Fig. 4, Fig. 4
The speckle schematic diagram that sub- laser beam provided in an embodiment of the present invention is 36.
Wherein, in Fig. 3, in speckle contrast C=0.67, Fig. 4, speckle contrast C=0.22.
Therefore, laser beam is divided by multiple sub- laser beams with different optical path delay by the refraction optical element,
The purpose that laser speckle inhibits can be achieved.
It should be noted that the engineering diffuser will respectively be parallel to each other when the smooth siphunculus is solid light siphunculus
Sub- laser scattering beam is the light of different angle, to improve the even light effect of the smooth siphunculus.The angle of scattering of the engineering diffuser
Less than the acceptance angle of the smooth siphunculus, make the sub- laser beam being incident to inside the smooth siphunculus on the boundary of the smooth siphunculus and air
Face experiences total internal reflection.Since the sub- laser beam of multiple dispersion angles passes through multiple total internal reflection, it is equal beam distribution can be reached
Even purpose, and then realize the even light effect of light siphunculus.
When the smooth siphunculus is hollow smooth siphunculus, splice structure by four side walls that inner wall is coated with high reflecting metal film
At, using the high reflecting metal film on inner wall will go into the sub- laser beam inside light siphunculus carry out multiple reflections.Due to multiple
The light beam of dispersion angle passes through multiple reflections, can reach the uniform purpose of beam distribution, and then realize the even light efficiency of light siphunculus
Fruit.Since hollow smooth siphunculus is to carry out even light by high reflecting metal film reflection light, so the angle of scattering of engineering diffuser can
To become larger, increase the angle of hollow smooth siphunculus inlet incident light, reaches better even light effect.
Further, be based on the above embodiment of the present invention, with reference to Fig. 5, Fig. 5 be it is provided in an embodiment of the present invention another dissipate
The structural schematic diagram of spot inhibition device.
It is convergent lens 4.3 that the optics, which is coupled into end, and the multimode lightguide is multimode fibre 4.4；
Wherein, the refraction optical element 3 is transmission-type refraction optical element 3.1；
The size reduction for the sub- laser beam that the convergent lens 4.3 is used to for multi beam being parallel to each other；
The multimode fibre 4.4 be used to making the sub- laser beam after size reduction inside the multimode fibre 4.4 into
Row total internal reflection.
In this embodiment, the laser beam that laser 1 is emitted impinges perpendicularly on transmission-type folding after the collimation of collimation lens 2
It penetrates on optical element 3, after concentrated lens 4.3, is coupled into multimode fibre 4.4.
For multimode fibre 4.4 compared with light siphunculus 4.2, the core size of multimode fibre 4.4 is smaller (micron order), therefore needs
To use convergent lens 4.3 by the size reduction of sub- laser beam, sub- laser beam is inside the multimode fibre 4.4 by repeatedly complete
After internal reflection, the speckle light field that sub- laser beam generates carries out space overlapping in the exit of the multimode fibre 4.4, at this time speckle
It can be suppressed.
Further, be based on the above embodiment of the present invention, with reference to Fig. 6, Fig. 6 be it is provided in an embodiment of the present invention another dissipate
The structural schematic diagram of spot inhibition device.
It is spectroscope 4.5 and engineering diffuser 4.1 that the optics, which is coupled into end, and the multimode lightguide is light siphunculus 4.2；
Wherein, the refraction optical element 3 is reflective refraction optical element 3.2；
Treated that laser beam passes through the spectroscope 4.5 first is incident to the refraction optical element 3.2 for collimation；
The refraction optical element 3.2, which is used to for laser beam to be divided into multi beam with different optical path delay that is parallel to each other, to swash
Light beam, and reflex to the spectroscope 4.5；
The sub- laser beam that the spectroscope 4.5 is used to for multi beam being parallel to each other reflexes to the engineering diffuser 4.1；
The engineering diffuser 4.1 is used to swash the son that the sub- laser scattering beam that multi beam is parallel to each other is different angle
Light beam；
The smooth siphunculus 4.2 is for carrying out the sub- laser beam of different angle inside the smooth siphunculus 4.2 in complete
Reflection.
In this embodiment, which is that beam of laser can be spatially divided into multi beam with not by one kind
With the optical element of the sub- laser beam of optical path delay, further, as long as meet beam of laser can be spatially divided into it is more
Beam has the optical element of the sub- laser beam of different optical path delay, such as plates high reflecting metal at the refraction optical element back
Reflective refraction optical element etc. is made in film.
It should be noted that the optical path of the spectroscope and collimation treated laser beam is arranged at unspecified angle, it is optional
, the optical path angle at 45 ° of the spectroscope and collimation treated laser beam is arranged；
The optical path of the refraction optical element and collimation treated laser beam is arranged at unspecified angle, optionally, described
The optical path of refraction optical element and collimation treated laser beam is arranged at an angle of 90.
The laser beam of laser emitting is incident on spectroscope 4.5 after the collimation of collimation lens 2 with 45° angle, and vertical
It is incident on reflective refraction optical element 3.2, the reflective refraction optical element 3.2 spatially divides single laser beam
For multiple sub- laser beams, the sub- laser beam formed after being reflected passes through engineering diffuser 4.1 after reflecting using spectroscope 4.5
With the even light of light siphunculus 4.2, as with speckle inhibit function even optical illumination light source.
Laser beam is primary in the incident reflection of the reflective refraction optical element 3.2, and the optical path delay of generation is Xiang Tongtai
Twice of the transmission-type refraction optical element 3.1 of rank height, the optical path delay between sub- laser beam increase, and speckle inhibitory effect is more
It is good.
It should be noted that the multimode lightguide not only includes the smooth siphunculus and the multimode fibre, it further include it
He has the optical element of even light action.
Also, the optical path delay that the speckle inhibits device to introduce sub- laser beam can be less than, greater than or equal to laser
Coherence length.
Specifically, the temporal coherence of sub- laser beam weakens, and speckle contrast reduces when optical path delay increases.It is preferred that
, when optical path delay is greater than the coherence length of laser, sub- laser beam is complete incoherent light each other, and speckle contrast is down to most
It is low.
Based on the above-mentioned whole embodiments of the present invention, a kind of laser projection also provided in an alternative embodiment of the invention is shown
System, with reference to Fig. 7, Fig. 7 is a kind of structural schematic diagram of laser light projection display system provided in an embodiment of the present invention.
The laser light projection display system includes: that speckle inhibits device, relay lens 5, micro display chip 6, projection lens 7
With screen 8；
Wherein, the speckle inhibits device to be used to export the speckle light field after being suppressed；
The relay lens 5 is used to the speckle light field after the inhibition illuminating the micro display chip 6；
The micro display chip 6 is for generating image information；
The projection lens 7 is used for described image information amplification imaging to the screen 8.
In this embodiment, the speckle inhibits the structure of device to be illustrated by taking Fig. 2 as an example.
Laser light projection display system after being inhibited by speckle, can high degree raising Projection Display effect.
Device and laser light projection display system is inhibited to carry out in detail a kind of speckle of static state provided by the present invention above
Thin to introduce, used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For the device disclosed in the embodiment, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, phase
Place is closed referring to method part illustration.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the element that the process, method, article or equipment including a series of elements is intrinsic,
It further include either the element intrinsic for these process, method, article or equipments.In the absence of more restrictions,
The element limited by sentence "including a ...", it is not excluded that in the process, method, article or equipment including the element
In there is also other identical elements.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (14)
1. the speckle of static state a kind of inhibits device, which is characterized in that the speckle inhibit device include: laser, collimation lens,
Refraction optical element and multimode lightguide component；
Wherein, the laser is for issuing laser beam；
The collimation lens is for carrying out collimation processing to the laser beam；
The refraction optical element is divided into multi beam for the laser beam that will collimate that treated and is parallel to each other with different optical path delay
Sub- laser beam；
The sub- laser beam that the multimode lightguide component is used to that multi beam to be made to be parallel to each other spatially is overlapped；
The multimode lightguide component includes: that optics is coupled into end and multimode lightguide；
The optics is coupled into the input terminal that end is located at the multimode lightguide.
2. speckle according to claim 1 inhibits device, which is characterized in that it is engineering diffuser that the optics, which is coupled into end,
The multimode lightguide is light siphunculus；
Wherein, the refraction optical element is transmission-type refraction optical element；
The sub- laser scattering beam that the engineering diffuser is used to for multi beam being parallel to each other is the sub- laser beam of different angle；
The smooth siphunculus is for making the sub- laser beam of different angle carry out total internal reflection inside the smooth siphunculus.
3. speckle according to claim 2 inhibits device, which is characterized in that the angle of scattering of the engineering diffuser is less than institute
State the acceptance angle of light siphunculus.
4. speckle according to claim 1 inhibits device, which is characterized in that it is convergent lens, institute that the optics, which is coupled into end,
Stating multimode lightguide is multimode fibre；
Wherein, the refraction optical element is transmission-type refraction optical element；
The size reduction for the sub- laser beam that the convergent lens is used to for multi beam being parallel to each other；
The multimode fibre is for making the sub- laser beam after size reduction carry out total internal reflection inside the multimode fibre.
5. speckle according to claim 1 inhibits device, which is characterized in that it is spectroscope and engineering that the optics, which is coupled into end,
Diffuser, the multimode lightguide are light siphunculus；
Wherein, the refraction optical element is reflective refraction optical element；
Treated that laser beam passes through the spectroscope first is incident to the refraction optical element for collimation；
The refraction optical element is used to laser beam being divided into multi beam and be parallel to each other the sub- laser beam with different optical path delay, and
Reflex to the spectroscope；
The sub- laser beam that the spectroscope is used to for multi beam being parallel to each other reflexes to the engineering diffuser；
The sub- laser scattering beam that the engineering diffuser is used to for multi beam being parallel to each other is the sub- laser beam of different angle；
The smooth siphunculus is for making the sub- laser beam of different angle carry out total internal reflection inside the smooth siphunculus.
6. speckle according to claim 5 inhibits device, which is characterized in that treated that laser beam is logical first for the collimation
It crosses the spectroscope and is incident to the refraction optical element, comprising:
The optical path angle at 45 ° of the spectroscope and collimation treated laser beam is arranged so that collimation treated laser beam with
45° angle is incident to the spectroscope；
The optical path of the refraction optical element and collimation treated laser beam is arranged at an angle of 90, so as to pass through the spectroscope
Laser beam be incident to the refraction optical element with 90 ° of angles.
7. speckle according to claim 5 inhibits device, which is characterized in that the refraction optical element back is coated with high anti-
Penetrate metal film.
8. speckle according to claim 1 inhibits device, which is characterized in that the refraction optical element is one-dimensional square row
The step-like optical texture of column or the space overlapping of two kinds of one-dimensional step-like optical textures or the step-like light of two-dimensional directional arrangement
Learn structure.
9. speckle according to claim 8 inhibits device, which is characterized in that the step-like optical texture is by transparent glass
Or transparent plastic is made.
10. speckle according to claim 9 inhibits device, which is characterized in that the material of the transparent glass is N-BK7 light
Learn glass；
The material of the transparent plastic is PMMA material.
11. speckle according to claim 8 inhibits device, which is characterized in that between the step of the step-like optical texture
Difference in height is set at random.
12. speckle according to claim 8 inhibits device, which is characterized in that the step surface of the step-like optical texture
For plane or curved surface.
13. speckle according to claim 1 inhibits device, which is characterized in that the speckle inhibits device to swash the son
Light beam introduce optical path delay be less than or equal to or greater than laser coherence length.
14. a kind of laser light projection display system, which is characterized in that the laser light projection display system includes: such as claim 1-
13 described in any item speckles inhibit device, relay lens, micro display chip, projection lens and screen；
Wherein, the speckle inhibits device to be used to export the speckle light field after being suppressed；
The relay lens is used to the speckle light field after the inhibition illuminating the micro display chip；
The micro display chip is for generating image information；
The projection lens is used for described image information amplification imaging to the screen.
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| CN112099248A (en) * | 2020-09-28 | 2020-12-18 | 中国华录集团有限公司 | Laser speckle weakening device and method based on magneto-optical effect depolarization |
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