CN112630986B - Speckle suppression movement device based on flexible diffractive optical element - Google Patents
Speckle suppression movement device based on flexible diffractive optical element Download PDFInfo
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- CN112630986B CN112630986B CN202011579646.1A CN202011579646A CN112630986B CN 112630986 B CN112630986 B CN 112630986B CN 202011579646 A CN202011579646 A CN 202011579646A CN 112630986 B CN112630986 B CN 112630986B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/4233—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/06—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the phase of light
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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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Abstract
A speckle suppression movement device based on a flexible diffractive optical element comprises a flexible film with a diffractive optical microstructure and a transmission system for driving the flexible film to move, wherein the flexible film comprises a middle part and two side parts, the diffractive optical microstructure is carved on the middle part, and the two side parts are adhesion structures; the adhesion structure is linked with the transmission system. The speckle suppression movement device provided by the invention has the advantages of high transmission efficiency, good stability, long service life of the flexible diffractive optical element and capability of eliminating the influence of abutted seams.
Description
Technical Field
The invention belongs to the field of laser display projection, and particularly relates to an adaptive movement device for inhibiting laser speckle by using a flexible diffractive optical element.
Background
With the development of society and economy, people have higher and higher requirements on viewing, and home viewing is from black and white televisions in the same year, to current large-screen liquid crystal televisions and more popular laser projectors.
The laser is a light source with high brightness and wide color gamut, and has the advantages of long service life, energy conservation, environmental protection and the like. The laser is applied to the projector, so that the projector is smaller in size, abundant and bright colors of an objective world can be truly reproduced, and more shocking expressive force is provided.
But meanwhile, the quality of a projected image is reduced due to speckles generated by the coherence of laser, and the laser speckles become a main obstacle for obtaining a high-quality image by a laser source projection display system. To date, researchers around the world have proposed a number of methods for speckle suppression, such as introducing polarization diversity, moving screens, broadband lasers, eliminating beam coherence, and the like. In order to obtain a good speckle suppression effect, the methods often need mechanical motion modes such as vibration, linear displacement, rotary motion and the like for components.
The closest techniques to the present invention are: a flexible variable-angle array diffraction optical microstructure and a crawler type movement method thereof (patent number: ZL201710998312. X) and a speckle suppression movement device based on a diffraction optical element (patent application number: 201811274730.5).
In a flexible variable angle array diffraction optical microstructure and a crawler type movement method (ZL201710998312. X) thereof, a flexible film with the diffraction optical microstructure is sleeved on two rotating vertical columns in an end-to-end connection mode, wherein one rotating vertical column is connected with two springs, and the springs apply tension to the rotating vertical columns, so that the flexible variable angle array diffraction optical microstructure is always in a stretching state. Two rotating columns are installed on a crawler-type conveying device based on gear transmission, after the device drives the rotating columns to rotate, the flexible variable-angle array diffraction optical microstructure performs crawler-type motion along with friction force between the flexible variable-angle array diffraction optical microstructure and the rotating columns, a dynamically-changed diffraction optical structure is generated, phase distribution of laser beams is changed, spatial coherence of the laser is damaged, and the effect of inhibiting speckles is achieved. However, the technical scheme has the following defects: 1) The flexible film rotates only by friction force and is continuously contacted with the upright column, so that the problems of film slipping, optical structure abrasion, deformation, displacement and the like can occur in long-term use, the accuracy of the diffractive optical microstructure is reduced, and the service life of the flexible film is prolonged; 2) The flexible film is bonded end to end into a ring shape, so that a relatively obvious seam is bound to exist, and the subsequent projection imaging is greatly influenced due to the fact that the transmittance and the flatness of the seam are different from those of other places on the film.
A speckle suppression movement device based on a diffractive optical element (patent application number: 201811274730.5) is characterized in that a transmission device in the technology is improved, a flexible film with a diffractive optical microstructure is divided into a flexible variable-angle array diffractive optical microstructure and a transmission section, wherein the transmission section is a single-sided synchronous belt structure with trapezoidal teeth or arc teeth and is sleeved on two rotating stand columns capable of being meshed with the transmission section, one stand column is connected with a motor, and the other stand column is connected with a spring to tension the flexible film. The device adopts the tooth to mesh with the tooth's socket of stand to transmit power, has avoided the stand to the wearing and tearing of diffraction optical microstructure when only relying on frictional force transmission, has prolonged the life of the flexible film that has diffraction optical microstructure. However, this technique has the following disadvantages: 1) The transmission structure of trapezoidal teeth or arc teeth is difficult to manufacture on the flexible film, and the depth of the teeth is too shallow, the flexible film is soft, and the teeth are difficult to mesh with tooth grooves on the upright posts to transmit power; 2) The spring is connected with the stand column to strain the flexible film, so that the film is deformed, the diffraction optical microstructure is greatly damaged, and the speckle suppression effect is influenced.
In a word, the prior art has the problems of low transmission efficiency of the flexible film, large damage of the diffraction optical microstructure and influence of the abutted seams on projection imaging.
Disclosure of Invention
In order to overcome the defects of low transmission efficiency of a flexible film, large damage of a diffraction optical microstructure and influence of seam splicing on projection imaging of the conventional speckle eliminating device, the invention provides the speckle inhibiting movement device which has high transmission efficiency, good stability and long service life of a flexible diffraction optical element and can eliminate the influence of seam splicing.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a speckle suppression movement device based on a flexible diffractive optical element comprises a flexible film with a diffractive optical microstructure and a transmission system for driving the flexible film to move, wherein the flexible film comprises a middle part and two side parts, the diffractive optical microstructure is carved on the middle part, and the two side parts are of adhesion structures; the adhesion structure is linked with the transmission system.
Further, the width of the two side edge parts of the flexible film is the same, and the width of the two conveyor belts is the same as that of the side edge parts. The two side parts are not provided with diffraction optical microstructures, and are smooth and suitable for adhesion.
Still further, the flexible film is made of a material with good elasticity and high light transmittance, and the flexible film can be made of, but not limited to, polyvinyl chloride (PVC), polypropylene (PP), polyethylene terephthalate (PET), and polymethyl methacrylate (PMMA).
Furthermore, the transmission system comprises a crawler-type moving conveyor belt and rotating wheels driving the conveyor belt to rotate, an output shaft of the driving motor is connected with the driving shaft, two driving rotating wheels are mounted on the driving shaft, two driven rotating wheels are mounted on the driven shaft, and the distance between the two driving rotating wheels and the distance between the two driven rotating wheels are the same as the distance between the middle parts of the flexible films; the driven shaft is rotatably installed on the rack, the driving rotating wheel and the driven rotating wheel are sleeved with the conveying belt, and the two side parts are bonded on the conveying belt.
The outer sides of the conveying belts are flat surfaces suitable for adhesion, the length of one circle of the conveying belts is the same as that of the flexible thin film, two side portions of the flexible thin film are tightly adhered to the outer sides of the two conveying belts respectively, one circle of the flexible thin film is adhered around the conveying belts, the flexible thin film is tightly connected end to end but not adhered together, and the transmittance, the flatness and the diffractive optical microstructure at the position where the flexible thin film is connected end to end are the same as those at other positions of the flexible thin film. The flexible film can be in crawler-type movement together with the two conveyor belts after being firmly bonded, and laser can be transmitted through the part engraved with the diffractive optical microstructure.
Preferably, the conveyor belt is made of a material which is wear-resistant, flat, high in surface friction coefficient, high in tensile strength and suitable for adhesion, and the material can be made of, but is not limited to, rubber.
Preferably, the two side portions of the flexible film and the outer side of the conveyor belt can be tightly bonded by, but not limited to, glue.
Preferably, the diameters of the driving shaft and the driven shaft are smaller than the diameter of the rotating wheel, so that the part, in the middle of which the diffractive optical microstructure is carved, is prevented from contacting with the driving shaft or the driven shaft when the film and the two conveyor belts move together in a crawler type.
Preferably, the surface of the rotating wheel is knurled, so that the friction force between the rotating wheel and the conveying belt is increased, and the conveying belt is prevented from slipping.
The technical conception of the invention is as follows: the flexible film both sides are respectively around two conveyer belt outsides bonding round, and the flexible film end to end is closely connected but not the bonding together, and the flexible film can carry out crawler-type motion with the conveyer belt after gluing firmly, and laser is carved with the partial transmission of diffraction optical microstructure from the film in the middle, and the flexible film that moves produces dynamic change's diffraction optical structure, changes laser beam's phase distribution, destroys the spatial coherence of laser, reaches the effect that suppresses the speckle.
Compared with the prior art, the invention has the following beneficial effects: 1) The flexible film is adhered to the conveying belt to perform crawler-type movement along with the conveying belt, so that the film does not slip during working, and the stability is better; 2) The flexible film can perform crawler-type motion without being in a tightly pulled state, so that the deformation of the film is avoided, and the service life of the diffraction optical element is prolonged; 3) The part of the flexible film, which is carved with the diffractive optical microstructure, is not in frictional contact with any device, so that the damage to the diffractive optical microstructure is eliminated, and the speckle suppression effect is better: 4) The flexible films are closely connected end to end but are not bonded together, so that the problem of seam splicing when the flexible films are bonded into a ring shape in the prior art is solved, and the influence on subsequent projection imaging is eliminated.
Drawings
FIG. 1 is a schematic representation of a flexible film with diffractive optical microstructures. 101 is a middle portion engraved with a diffractive optical microstructure, and 102 is both side portions bonded to the conveyor belt.
Fig. 2 is a schematic diagram of a speckle reduction motion device. Reference numeral 103 denotes a conveyor belt, 104 denotes a runner, 105 denotes a driving shaft, 106 denotes a driven shaft, and 107 denotes a driving motor.
Fig. 3 is a front view of a speckle reduction motion device with a flexible membrane. 108 are laser spots that impinge on the flexible film.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 3, a speckle suppression movement device based on a flexible diffractive optical element comprises a flexible film with a diffractive optical microstructure and a transmission system for driving the flexible film to move, wherein the flexible film comprises a middle part 101 and two side parts 102, the diffractive optical microstructure is engraved in the middle part 101, and the two side parts 102 are adhesion structures; the adhesion structure is linked with the transmission system.
Further, the width of both side edge portions of the flexible film is the same, and the width of both the conveyor belts 103 is the same as the width of the side edge portions. The two side portions 102 are not engraved with diffractive optical microstructures and are flat and suitable for adhesion.
Still further, the flexible film is made of a material with good elasticity and high light transmittance, and the flexible film can be made of, but not limited to, polyvinyl chloride (PVC), polypropylene (PP), polyethylene terephthalate (PET), and polymethyl methacrylate (PMMA).
The transmission system comprises a crawler-type moving conveyor belt 103 and a rotating wheel 104 for driving the conveyor belt to rotate, an output shaft of a driving motor 107 is connected with a driving shaft 105, two driving rotating wheels are installed on the driving shaft 105, two driven rotating wheels are installed on a driven shaft 106, and the distance between the two driving rotating wheels and the distance between the two driven rotating wheels are the same as the distance between the middle parts 102 of the flexible films; the driven shaft is rotatably arranged on the rack, the transmission belt 103 is sleeved on the driving rotating wheel and the driven rotating wheel, and the two side parts 102 are bonded on the transmission belt 103.
The outer sides of the conveyor belts 103 are flat surfaces suitable for adhesion, the length of one circle of the conveyor belts 103 is the same as that of the flexible film, two side portions 102 of the flexible film are tightly adhered to the outer sides of the two conveyor belts respectively, one circle of the flexible film is adhered around the conveyor belts, the flexible film is tightly connected end to end but is not adhered together, and the transmittance, the flatness and the diffraction optical microstructure at the positions where the end to end are connected are the same as those at other positions of the flexible film. The flexible film can be in crawler-type movement together with the two conveyor belts after being firmly bonded, and laser can be transmitted through the part engraved with the diffractive optical microstructure.
Preferably, the conveyor belt 103 is made of a material which is wear-resistant, flat, has a large surface friction coefficient and a large tensile strength, and is suitable for adhesion, and the material can be made of, but is not limited to, rubber.
Preferably, the two sides of the flexible film and the outer side of the conveyor belt can be tightly adhered by using, but not limited to, glue.
Preferably, the diameters of the driving shaft 105 and the driven shaft are smaller than the diameter of the rotating wheel 104, so as to avoid the contact between the middle part engraved with the diffractive optical microstructure and the rotating shaft when the film and the two conveyor belts perform crawler-type motion.
Preferably, the surface of the rotating wheel 104 is knurled to increase the friction between the rotating wheel and the conveyor belt, so as to prevent the conveyor belt from slipping.
When the moving device is used, two side parts 102 of the flexible film are respectively bonded around the outer sides of the two conveyor belts 103 for a circle, the flexible film is closely connected end to end but is not bonded together, after the driving shaft 105 is driven by the driving motor 107 to rotate, the flexible film and the conveyor belts 103 move in a crawler-type manner, laser is transmitted through the middle part 101 of the film, which is engraved with a diffractive optical microstructure, the moving flexible film generates a dynamically-changed diffractive optical structure, the phase distribution of laser beams is changed, the spatial coherence of the laser is damaged, and the effect of inhibiting speckles is achieved.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.
Claims (7)
1. A speckle suppression movement device based on a flexible diffractive optical element is characterized by comprising a flexible film with a diffractive optical microstructure and a transmission system for driving the flexible film to move, wherein the flexible film comprises a middle part and two side parts, the diffractive optical microstructure is carved on the middle part, and the two side parts are of adhesion structures; the adhesion structure is linked with the transmission system;
the transmission system comprises a crawler-type moving conveyor belt and a rotating wheel for driving the conveyor belt to rotate; an output shaft of the driving motor is connected with a driving shaft, two driving rotating wheels are installed on the driving shaft, two driven rotating wheels are installed on the driven shaft, and the distance between the two driving rotating wheels and the distance between the two driven rotating wheels are the same as the distance between the middle parts of the flexible films; the driven shaft is rotatably arranged on the rack, the driving rotating wheel and the driven rotating wheel are sleeved with the conveying belt, and the two side parts are bonded on the conveying belt;
the outer sides of the conveying belts are flat surfaces suitable for adhesion, the length of one circle of the conveying belts is the same as that of the flexible film, two side parts of the flexible film are tightly adhered to the outer sides of the two conveying belts respectively, one circle of the flexible film is adhered around the conveying belts, the flexible film is tightly connected end to end but not adhered together, and the transmittance, the flatness and the diffraction optical microstructure at the position where the end to end is connected are the same as those at other positions of the flexible film.
2. The speckle-suppressing motion device based on a flexible diffractive optical element according to claim 1, wherein the widths of both side portions of the flexible film are the same, and the widths of both the conveyor belts are the same as the widths of the side portions.
3. The speckle reduction movement apparatus based on the flexible diffractive optical element according to claim 1 or 2, wherein the flexible film is made of a material with good elasticity and high light transmittance, and the material of the flexible film is polyvinyl chloride, polypropylene, polyethylene terephthalate or polymethyl methacrylate.
4. The speckle-suppression motional device based on flexible diffractive optical elements as claimed in claim 1, wherein said conveyor belt is made of a material which is wear-resistant, flat, has a high surface friction coefficient and a high tensile strength, and is suitable for adhesion, and said conveyor belt is made of rubber.
5. The speckle-suppressing motion device based on a flexible diffractive optical element as claimed in claim 1, wherein the two side portions of the flexible film are tightly adhered to the outside of the conveyor belt by glue.
6. The speckle-suppressing motion apparatus based on a flexible diffractive optical element as claimed in claim 1, wherein the diameters of the driving and driven shafts are smaller than the diameter of the rotating wheel.
7. The speckle-suppressing motion device based on a flexible diffractive optical element as claimed in claim 1, wherein the surface of the wheel is knurled.
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| CN202011579646.1A CN112630986B (en) | 2020-12-28 | 2020-12-28 | Speckle suppression movement device based on flexible diffractive optical element |
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| CN202011579646.1A CN112630986B (en) | 2020-12-28 | 2020-12-28 | Speckle suppression movement device based on flexible diffractive optical element |
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| CN112630986B true CN112630986B (en) | 2023-03-31 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5784200A (en) * | 1993-05-27 | 1998-07-21 | Dai Nippon Printing Co., Ltd. | Difraction grating recording medium, and method and apparatus for preparing the same |
| CN102385239A (en) * | 2011-10-12 | 2012-03-21 | 江苏尚阳数字科技有限公司 | Stereoscopic image showing system and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107678171B (en) * | 2017-10-20 | 2019-03-12 | 浙江工业大学 | A kind of laser speckle suppressing method based on flexible varied angle slot array diffraction optical device |
| CN109270700A (en) * | 2018-10-30 | 2019-01-25 | 浙江工业大学 | Speckle based on diffraction optical element inhibits telecontrol equipment |
| CN212060848U (en) * | 2020-02-27 | 2020-12-01 | 浙江工业大学 | Laser projection system based on flexible diffractive optical element |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5784200A (en) * | 1993-05-27 | 1998-07-21 | Dai Nippon Printing Co., Ltd. | Difraction grating recording medium, and method and apparatus for preparing the same |
| CN102385239A (en) * | 2011-10-12 | 2012-03-21 | 江苏尚阳数字科技有限公司 | Stereoscopic image showing system and method |
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