CN202075495U - Speckle eliminating device based on Mie scatter and optical element - Google Patents
Speckle eliminating device based on Mie scatter and optical element Download PDFInfo
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- CN202075495U CN202075495U CN2011200307401U CN201120030740U CN202075495U CN 202075495 U CN202075495 U CN 202075495U CN 2011200307401 U CN2011200307401 U CN 2011200307401U CN 201120030740 U CN201120030740 U CN 201120030740U CN 202075495 U CN202075495 U CN 202075495U
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- optical reflection
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Abstract
The utility model relates to the display technology field taking coherent light as light source, particularly relates to a speckle eliminating device based on a Mie scatter and an optical element to solve the problems of poor speckle eliminating effect, complexity in structure, high possibility of damaging, high cost and the like existing in the existing speckle eliminating method. The speckle eliminating device comprises an optical reflection cavity and the optical element, wherein the optical reflection cavity is provided with an incidence light coupling device and a transmission emergent surface; the optical element is right opposite to the incidence light coupling device of the optical reflection cavity and can change the incidence angle of a light beam when the light beam is subject to incidence in the incidence light coupling device of the optical reflection cavity; except for the inner wall of the transmission emergent surface, the inner walls of the optical reflection cavity are all mirror-surface inner walls; the optical reflection cavity is internally provided with transparent solid matters which fill the whole optical reflection cavity to the full; and insulating particles with the size capable of causing incidence laser to generate Mie scattering are scattered in the transparent solid matters. The speckle eliminating device has a reasonable and compact structure, good speckle eliminating effect, high laser utilization rate, stable performance, safety, reliability, and a dodging function.
Description
Technical field
It is the display technique field of light source that the utility model relates to the coherent light, specifically is a kind of speckle cancellation element based on Mie scattering and optical device, is primarily aimed at the optics speckle phenomena that exists in laser display technology and the optical instrument.
Background technology
When being the light source irradiation screen,, cause human eye to see the image that is covered by speckle, have a strong impact on image displaying quality, hinder the observer and from image, extract useful information because the coherence of laser and screen is coarse with laser.Therefore, how to eliminate speckle is to be the optical instrument field of light source and the research and development focus in the display technique field with laser always.And with regard to present result of study, roughly can be divided into two big classes for eliminating the used method of speckle: one, the temporal coherence by the control LASER Light Source reduces speckle, its principle is to produce the boiling speckle by adjusting optical maser wavelength (perhaps frequency) and multi wave length illuminating source, successfully eliminates hot spot by control Laser Time coherence at present and reaches the practical technical scheme that requires and be superposed to the master with multiple light courcess basically; Two, eliminate speckle by control laser beam spatial coherence, it is the main method of eliminating speckle at present, ultimate principle is to adjust the PHASE DISTRIBUTION of primitive light wave in the laser beam, thereby change the space distribution of speckle, a plurality of speckle images are superimposed in integral time at human eye, obtain the image that a luminous energy is evenly distributed, and then realize eliminating the purpose of speckle.Concrete method has: adopt rotation scatterer, vibration screen, vibration to have Hadamard figure scatterer, dither optical fiber etc.Said method, or will be, even need high frequency or significantly vibration, or want integrated multiple light courcess by mechanical vibration, the implementation structure complexity, fragile, cost is high, main is that speckle is eliminated poor effect.
Technical scheme by mechanical vibration is also arranged not, for example: the patent No. is that 200820122639.7 Chinese patent discloses " a kind of decohering and shimming device based on scattering ", require to use contain diameter must be less than the scattering medium of the particle of lambda1-wavelength 1/10th, to realize that incident laser is formed Rayleigh scattering.Utilize inorganic salts or organic alcohol solution (as NaCl, KCl, KNO in the patent
3Or ZnSO
4Aqueous solution) as scattering medium, existence form based on inorganic salts or organic alcohol solution is hydrated ion or big molecule, little a lot of with respect to optical maser wavelength, can form Rayleigh scattering to incident laser, realize the incident laser beam splitting with this, and in photoconductive tube, conduct, eliminate speckle in the hope of the coherence who reduces incident laser, utilize the mixed light effect of photoconductive tube simultaneously, above-mentioned beam splitting light is carried out homogenize come the shimming eliminating coherence.But test by the described technical method of this application, at room temperature, utilize length to eliminate speckle for 50mm, the photoconductive tube that is full of saturated NaCl aqueous solution, result's speckle contrast is 70%, does not almost play the effect that reduces speckle.
Summary of the invention
The utility model provides a kind of speckle cancellation element based on Mie scattering and optical device for problems such as the elimination speckle poor effect that solves existing speckle removing method and exist, implementation structure complexity, fragile, cost height.
The utility model is to adopt following technical scheme to realize: based on the speckle cancellation element of Mie scattering and optical device, and the optical device that comprises the optical reflection chamber which is provided with incident light coupling device and transmission exit facet, is provided with over against optical reflection chamber incident light coupling device; Described optical device is the optical device of the incident angle in the time of changing light beam beam incident optical reflection cavity incident light coupling device; It (is that inwall has the high reflectance characteristic that the inwall of optical reflection chamber except that transmission exit facet inwall is all " minute surface " inwall, energy " total reflection " is incident in the laser beam in the optical reflection chamber), be provided with the transparent solid matter that fills up whole optics reflection cavity in the optical reflection chamber, and be scattered with the insulating particles that its dimension can cause incident laser generation Mie scattering in the transparent solid matter.
Described optical device can adopt scanning micro-mirror or variable focus microlens.
During application, as Fig. 4,5,6, shown in 7, by the LASER Light Source emission laser beam after optical device (scanning micro-mirror or variable focus microlens) modulation, passing incident light coupling device on the optical reflection chamber with different incidence angles incides in the transparent solid matter in the optical reflection chamber, with the insulating particles effect generation Mie scattering of scattering in the transparent solid matter (as shown in Figure 3, when Mie scattering takes place in incident laser 101 irradiation insulating particles 402, scattered light light distribution after incident laser 101 scatterings is in a very wide angular range, mainly concentrate on forward scattering light 104,105,106, generally account for total scattering more than 90%; 102 of rear orientation lights account for very fraction, usually less than 10%; Scattered light 105 light intensity along the incident laser working direction are the strongest, the scattered light 103,107 of vertical direction is the most weak, therefore incident laser is after insulating particles 402 scatterings, be beamed into the scattered light that a plurality of intensity do not wait, the scattered light scattering angle distributes and enlarges simultaneously), be beamed into the scattered light that a plurality of intensity do not wait, or reflect through the optical reflection cavity wall, or once more with transparent solid matter in the insulating particles effect generation Mie scattering of scattering, the scattered light beam splitting is more scattered light, after Mie scattering repeatedly, by the transmission exit facet outgoing in optical reflection chamber; And the incident angle of optical device when making laser beam beam incident optical reflection cavity changes continuously, cause each constantly incident laser light beam through the scattered light direction of propagation, path change in transparent solid matter that scattering obtains, finally in PHASE DISTRIBUTION, the scattering angle distribution random variation of the scattered light of optical reflection chamber exit facet outgoing.And the outgoing scattered light in the different moment has different PHASE DISTRIBUTION, scattering angle distributes, and after projection, can correspondingly produce a speckle image respectively; In human eye integral time (50ms), a plurality of speckle images are superimposed, can obtain the image that a luminous energy is evenly distributed, and then realized eliminating the purpose of speckle phenomena.
Compared with prior art, the utility model is provided with the optical reflection chamber, in the optical reflection chamber, incident laser is carried out Mie scattering, carry out the scattering beam splitting, and continuously change the angle of laser beam incident optical reflection cavity with optical device, and then the direction of propagation and the path of randomly changing scattered beam in the optical reflection chamber, make optical reflection chamber exit facet at the scattered light of different time with different PHASE DISTRIBUTION and scattering angle distribution outgoing incident laser; Thereby produce the space distribution of speckle after the change projection, make a plurality of speckle images superimposed in integral time, obtain the image that a luminous energy is evenly distributed, and then effectively eliminate speckle at human eye.And through experimental test, use device described in the utility model after, the speckle contrast of image can be lower than 4%, the speckle contrast of image reaches 3.72% and 3.91% respectively, speckle is eliminated works very well; And can improve speckle by the modulation condition (as: scanning micro-mirror angle amplitude of variation, variable focus microlens focal length variations amplitude) of insulating particles concentration in the transparent solid matter of raising and optical device and eliminate effect; The utility model carries out " total reflection " to incident laser in the optical reflection chamber, the overall light loss of energy of incident laser is very little, has guaranteed the high usage of laser, and has realized even light purpose in " total reflection " process; Each ingredient of device described in the utility model is solid-state, does not have problems such as leak of liquid, suspending liquid sedimentation, and stable performance is safe and reliable.
The utility model is rational in infrastructure, compact, and speckle is eliminated effective, laser utilization factor height, and stable performance, safe and reliable, and have even light function.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model;
Fig. 2 is an another kind of structural representation of the present utility model;
Fig. 3 is the light intensity angle distribution plan of Mie scattering;
Fig. 4 is the scanning micro-mirror view of device described in the utility model during incident laser at an angle;
Fig. 5 changes the view of device described in the utility model after the incident laser incident angle for scanning micro-mirror;
The view of device described in the utility model when Fig. 6 is a variable focus microlens with a certain focal length incident laser;
Fig. 7 is the view of device described in the utility model behind the variable focus microlens varifocal incident laser;
Fig. 8 is for adopting the application synoptic diagram of device shown in Figure 1 in the spot scan display system;
Fig. 9 is for adopting the application synoptic diagram of device shown in Figure 2 in the full frame display system;
Among the figure: the 101-incident laser; 102,103,104,105,106,107-scattered light;
300-speckle cancellation element; 301-incident light coupling device; 302-optical reflection chamber; 303-transmission exit facet; The 304-entrance pupil; 305,306,307-speckle cancellation element; The 308-optical device;
The transparent solid matter of 401-; The 402-insulating particles;
501,502,503-laser instrument; 504,505,506-mirror;
601,602,603-signal source;
The 700-lens; The 701-relay lens; 702-photomodulator DLP; The 703-TIR prism; The 704-relay lens; The 705-TIR prism; 706-photomodulator DLP; The 707-relay lens; The 708-level crossing; The 709-TIR prism; 710-photomodulator DLP; The 711-prism; 712-micro scanning mirror;
The 800-screen.
Embodiment
As shown in Figure 1, 2, based on the speckle cancellation element of Mie scattering and optical device, comprise the optical reflection chamber 302 which is provided with incident light coupling device 301 and transmission exit facet 303, the optical device 308 that 302 incident light coupling devices 301 are provided with over against the optical reflection chamber; Described optical device 308 is the optical device of the incident angle in the time of changing light beam beam incident optical reflection cavity 302 incident light coupling devices 301; It (is that inwall has the high reflectance characteristic that the inwall of optical reflection chamber 302 except that transmission exit facet 301 inwalls is all " minute surface " inwall, energy " total reflection " is incident in the laser beam in the optical reflection chamber), be provided with the transparent solid matter 401 that fills up whole optics reflection cavity 302 in the optical reflection chamber 302, and be scattered with the insulating particles 402 that its dimension can cause incident laser generation Mie scattering in the transparent solid matter 401.Described optical device 308 can adopt scanning micro-mirror or variable focus microlens.
During concrete enforcement, described scanning micro-mirror adopts one-dimensional scanning micro mirror or two-dimensional scan micro mirror all can; Described variable focus microlens adopts varifocal convex lens or varifocal concavees lens all can; Described transparent solid matter 401 should be the transparent solid matter that incident laser is not had transmission loss, as: high-molecular gel etc.; Described insulating particles 402 can adopt polystyrene microsphere, TiO 2 particles (TiO
2) wait insulating particles; Described optical reflection chamber 302 multiselects are made of metal, level crossing, transparent plastic or glass processing, and its shape need not special qualification, the general tubular housings that adopt more; Transmission exit facet 303 multiselects in optical reflection chamber 302 are made of transparent plastic or glass processing, and mostly are rectangle plane, and the surface is provided with the anti-reflection film that mates with the incident beam wave band.Incident light coupling device 301 on the described optical reflection chamber 302 can be realized by following structure: adopt the transmission plane of incidence, and be provided with the anti-reflection film that mates with the incident beam wave band on the surface; Perhaps adopt the entrance pupil structure, also can on entrance pupil 304, be equipped with optical coupling element, as: lens.
Speckle cancellation element described in the utility model can be applied in the laser projection display technology, for example: as shown in Figure 8, be applied to spot scan projection (Raster-Scanned Displays) system, signal source 601,602,603 is modulated tricolor laser device 501,502,503 output powers respectively according to the information of each pixel on the two dimensional image; Three incident lasers are derived in exit facet after modulating by mirror 504,505,506 coupling incidents speckle cancellation element 300 described in the utility model, and scioptics 700 and micro scanning mirror (Scan Mirror) 701 projects to screen 800.Under the driving of electric signal, micro scanning mirror 701 pursues picture element scan to screen according to two dimensional image.Should be applicable to that the laser-projector of spot scan and laser television show with example.
As shown in Figure 9, be applied to full frame Display projector (Full-Frame Displays) system, tricolor laser device 501,502,503 output firm power laser beams, coupling imports speckle cancellation element 305,306,307 described in the utility model respectively; After modulation, by relay lens 701,704,707, level crossing 708 and TIR prism 703,705,709 converge to photomodulator DLP 702,706,710; Photomodulator DLP 702,706,710 generates monochrome image according to every frame 2 dimension image information modulation; Tristimulus image is warm through prism 711, is projected to screen 800 by lens 700.Should be applicable to based on DMD that the laser-projector of optical modulation devices such as LCOS and laser television show with example.
Claims (5)
1. speckle cancellation element based on Mie scattering and optical device is characterized in that: the optical device (308) that comprises the optical reflection chamber (302) which is provided with incident light coupling device (301) and transmission exit facet (303), is provided with over against optical reflection chamber (302) incident light coupling device (301); Described optical device (308) is the optical device of the incident angle in the time of changing light beam beam incident optical reflection cavity (302) incident light coupling device (301); The inwall of optical reflection chamber (302) except that transmission exit facet (301) inwall is all " minute surface " inwall, be provided with the transparent solid matter (401) that fills up whole optics reflection cavity (302) in the optical reflection chamber (302), and be scattered with the insulating particles (402) that its dimension can cause incident laser generation Mie scattering in the transparent solid matter (401).
2. the speckle cancellation element based on Mie scattering and scanning micro-mirror according to claim 1 is characterized in that: transmission exit facet (303) surface of optical reflection chamber (302) is provided with the anti-reflection film with incident beam wave band coupling.
3. the speckle cancellation element based on Mie scattering and scanning micro-mirror according to claim 1 is characterized in that: described optical device (308) can adopt scanning micro-mirror or variable focus microlens.
4. the speckle cancellation element based on Mie scattering and scanning micro-mirror according to claim 1 is characterized in that: described transparent solid matter (401) is not for there being the transparent solid matter of transmission loss to incident laser.
5. the speckle cancellation element based on Mie scattering and scanning micro-mirror according to claim 1 is characterized in that: described insulating particles (402) adopt polystyrene microsphere or TiO 2 particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200307401U CN202075495U (en) | 2011-01-29 | 2011-01-29 | Speckle eliminating device based on Mie scatter and optical element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200307401U CN202075495U (en) | 2011-01-29 | 2011-01-29 | Speckle eliminating device based on Mie scatter and optical element |
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| CN202075495U true CN202075495U (en) | 2011-12-14 |
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| CN2011200307401U Expired - Lifetime CN202075495U (en) | 2011-01-29 | 2011-01-29 | Speckle eliminating device based on Mie scatter and optical element |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053382A (en) * | 2011-01-29 | 2011-05-11 | 中北大学 | Speckle elimination device based on Mie scattering and optical device |
| CN108508626A (en) * | 2018-03-16 | 2018-09-07 | 山西大学 | A kind of static diffusion sheet and dissipation spot method of movement scattering particles |
| CN112984461A (en) * | 2014-11-07 | 2021-06-18 | 大日本印刷株式会社 | Lighting device |
-
2011
- 2011-01-29 CN CN2011200307401U patent/CN202075495U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102053382A (en) * | 2011-01-29 | 2011-05-11 | 中北大学 | Speckle elimination device based on Mie scattering and optical device |
| WO2012100643A1 (en) * | 2011-01-29 | 2012-08-02 | 中北大学 | Speckle removal device based on mie scattering and optical part |
| CN102053382B (en) * | 2011-01-29 | 2013-06-05 | 中北大学 | Speckle elimination device based on Mie scattering and optical device |
| CN112984461A (en) * | 2014-11-07 | 2021-06-18 | 大日本印刷株式会社 | Lighting device |
| CN112984461B (en) * | 2014-11-07 | 2024-02-02 | 大日本印刷株式会社 | Lighting device |
| CN108508626A (en) * | 2018-03-16 | 2018-09-07 | 山西大学 | A kind of static diffusion sheet and dissipation spot method of movement scattering particles |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xia Yun Inventor after: Chen Xuyuan Inventor after: Gao Wenhong Inventor after: Shi Yunbo Inventor after: Zhang Wendong Inventor before: Chen Xuyuan Inventor before: Gao Wenhong Inventor before: Shi Yunbo Inventor before: Zhang Wendong |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: CHEN XUYUAN GAO WENHONG SHI YUNBO ZHANG WENDONG TO: XIA YUN CHEN XUYUAN GAO WENHONG SHI YUNBO ZHANG WENDONG |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20111214 Effective date of abandoning: 20130605 |
|
| RGAV | Abandon patent right to avoid regrant |