CN107678170A - A kind of flexible varied angle slot array diffraction optical device realizes system - Google Patents

Abstract

A realization system of a flexible variable-angle array diffractive optical device, including a mechanical module, an electrical control module, and an optical module, and the optical module includes a laser, a calibration lens, an aperture, a flexible variable-angle array diffractive optical device, an imaging lens, and a projection screen and a CCD camera and a computer processing system, the laser is a monochromatic laser of any wavelength in the visible light range, the laser, the calibration lens, the diaphragm, the flexible variable-angle array diffractive optical device and the imaging lens are located on the same optical axis; The mechanical module includes a crawler conveyor; the electrical control module includes a drive motor for driving the crawler conveyor to rotate and then drive the flexible variable-angle array diffractive optical device to realize the crawler movement. The present invention has good full-band speckle suppression effect, simple movement mode, easy realization, system versatility, good robustness and low cost.

Description

Realization system of a flexible variable-angle array diffractive optical device

technical field

The invention belongs to the field of laser display projection, and in particular relates to a realization system of a flexible variable-angle array diffractive optical device, which uses a movable diffractive optical device to suppress laser speckle.

Background technique

Laser projection display system is getting more and more attention and welcome because of its rich colors, high picture quality, long life, high reliability, high efficiency, low energy consumption and other advantages. However, since laser light is highly coherent light, a picture noise called laser speckle will inevitably be generated. Speckle appears as black spots randomly distributed in the laser spot, and its essence is the random coherent superposition of signals. The existence of speckle seriously affects the quality of images and information. In the field of laser projection display, speckle will degrade the image quality of projection display, cause viewers to experience symptoms such as fatigue and dizziness, seriously affect the experience of laser projector users, and become the core factor restricting the development of laser projection display systems and instruments . Therefore, it is necessary to develop laser speckle suppression technology and devices.

The most commonly used method for laser speckle suppression in the prior art is to use a moving diffractive optical device. Over the years, researchers have reported a variety of diffractive optical devices, including constant-period grating structures; micro-optical structures based on pseudo-random codes, M-sequence codes, and Barker codes; micro-optical structures based on Hadamard matrices, etc. The laser beam passes through these diffractive optical devices to form a diffractive light field, and the superposition of the dynamically changing diffractive light field can destroy the coherence of the laser light, and then play a role in suppressing laser speckle. In order to form the superposition of dynamically changing diffractive light fields, it is necessary to perform mechanical motions such as vibration, linear displacement, and rotational motion on the diffractive optical device. However, such a movement mode is not only complex and bulky in mechanical parts and operating mechanism, but also has impact damage to the laser projection display instrument. In addition, due to the need for reciprocating motion, it is impossible to ensure that the diffractive optical device is in a state of uniform motion, so the effect of speckle suppression is not ideal. The diffractive optical device and its implementation system closest to the present invention in the above-mentioned prior art, for example, Jahja I.Trisnadi adopted for the first time in the article "Hadamard speckle contrastreduction" (2004, Opt. Diffractive optical device based on Hadamard matrix structure and the implementation method is given; in "Full speckle suppression inlaser projectors using two Barker code-type diffractive optical elements" (2013, J.Opt.Soc.Am.A 30,22-31) In a paper, Lapchuk et al. adopted two diffractive optical devices based on the Barker code structure and made them move in a direction at a certain angle to the horizontal plane on a plane perpendicular to the optical axis. Laser speckle suppression experiments were carried out; Le Zichun, Xiong Qiyuan, Dong Wen and Fu Minglei proposed the use of binary optics in motion in the Chinese invention patent "A laser speckle suppression method based on optical diffraction elements" (CN 106896520A) Diffractive elements to suppress laser speckle.

However, the above-mentioned prior art methods based on motion diffractive optics all have drawbacks. Either the degree of speckle suppression is not enough; or full-band speckle suppression cannot be performed; or the structural design is too difficult, and the system's fault tolerance, robustness, and versatility are poor, which cannot meet the needs of practical applications; or it needs to reciprocate Type of mechanical movement has a large mechanical impact on the laser projection display instrument, poor stability, complex structure, high energy consumption, low efficiency, and the need to change the speed during the movement, resulting in poor speckle suppression effect and so on.

Contents of the invention

In order to overcome the insufficient effect of speckle suppression in the existing technology, the inability to perform full-band speckle suppression, the number and types of devices used in the system, the complexity of moving parts and impact damage to the instrument, large size, complex structure of the instrument, high energy consumption, However, due to the disadvantages of low efficacy and other disadvantages, the present invention provides a realization system of a flexible variable-angle array diffractive optical device with good full-band speckle suppression effect, simple movement mode, easy implementation, system versatility, good robustness, and low cost. Made of flexible materials, through the variable-angle array diffraction structure, a crawler-type movement mode that can circulate infinitely at a constant speed is constructed, and a system is used to achieve red, green, and blue full-band laser speckle suppression.

The technical solution adopted by the present invention to solve its technical problems is:

A realization system of a flexible variable-angle array diffractive optical device, including a mechanical module, an electrical control module, and an optical module, and the optical module includes a laser, a calibration lens, an aperture, a flexible variable-angle array diffractive optical device, an imaging lens, and a projection screen and a CCD camera and a computer processing system, the laser can be a monochromatic laser of any wavelength in the visible light range, and the laser, calibration lens, diaphragm, flexible variable-angle array diffractive optics and imaging lens are located on the same optical axis; The mechanical module includes a crawler conveyor; the electrical control module includes a drive motor for driving the crawler conveyor to rotate and then drive the flexible variable-angle array diffractive optical device to realize the crawler movement.

Further, the mechanical module includes a frame, two rotating columns and a spring, one rotating column can be translated left and right and rotatably set on one side of the frame, one end of the spring is connected to the one rotating column, the The other end of the spring is fixed on the frame; the other rotating column is rotatably set on the other side of the frame, and the other rotating column is connected with the output shaft of the drive motor, and the flexible variable angle array The diffractive optical device is wound on the two rotating columns, and the tension of the spring makes the flexible variable-angle array diffractive optical device always in a stretched state.

Still further, a driving gear is installed on the output shaft of the driving motor, a driven gear is installed on the outer end of the other rotating column, and the driving gear meshes with the driven gear. Of course, other transmission modes are also possible.

The driving motor is a stepping motor.

The optical module may include, but is not limited to, a red laser and its calibration lens, a green laser and its calibration lens, a blue laser and its calibration lens, a spectroscopic sheet that transmits red light and reflects green light and blue light, and transmits red light and green light. A spectroscopic sheet that reflects blue light; the red laser and its calibration lens, a spectroscopic sheet that reflects green light and blue light through red light, a spectroscopic sheet that reflects blue light through red light and green light, an aperture, and the variable angle array diffraction The optical device and the imaging lens are located on the same optical axis and are on the main optical axis, the optical axes of the green laser and its collimating lens, the blue laser and its collimating lens are perpendicular to the main optical axis, and the green laser emitted by the green laser The laser light enters the main optical path through the spectroscopic sheet that transmits red light and reflects green light and blue light, and the blue laser light emitted by the blue laser enters the main optical path through the spectroscopic sheet that transmits red light and green light and reflects blue light.

The flexible variable-angle array diffractive optical device is fabricated on a flexible material, and is composed of N groups of one-dimensional binary diffractive optical structures connected end to end. The one-dimensional binary diffractive optical structure includes a grating structure and an optical microstructure. The one Dimensional means that the diffractive optical structure is a one-dimensional pattern, and binary means that the optical path difference formed due to the depth of the diffractive optical structure is binarized.

The one-dimensional binary diffractive optical structure pattern is represented by a parameter T, and the parameter T is the minimum unit width of the optical microstructure, and the width of all optical microstructures is represented by an integer multiple of T, and the one-dimensional binary diffractive The total width of the optical structure pattern is represented by T ₀ ; the depth of the one-dimensional binary diffractive optical structure is h, and the inclination angle between the one-dimensional binary diffractive optical structure and the X axis is θ ₀ .

The optical microstructure is an optical microstructure based on a pseudo-random sequence, an optical microstructure based on an M sequence or an optical microstructure based on a Barker code.

The N is a positive integer, representing the number of arrays contained in the flexible variable-angle array diffractive optical device, N=1, 2, 3...∞, when N=1, the flexible variable-angle used for laser speckle suppression The array diffractive optical device is a single diffractive optical device, that is, a diffractive optical device unit, and each diffractive optical device unit includes m periods of one-dimensional binary diffractive optical structure patterns with the same structural parameters; when N≧2, the The flexible variable-angle array diffractive optical device for laser speckle suppression is a diffractive optical device comprising N arrays; the N diffractive optical device units in the array are fabricated on a single piece of flexible material at one time, and the N arrays in the array The patterns of the one-dimensional binary diffractive optical structures inside the diffractive optical device unit are the same or different, and the N groups of one-dimensional binary diffractive optical structures are connected end to end, and the heads of the first group of diffractive optical structures and the Nth Group of Diffractive Optical Structures Tail Connected.

The N diffractive optical device units in the array are different from the inclination angle of the X axis, expressed as θ _±i , where θ _±i = θ ₀ ±(N-1)2·Δθ±i·Δθ, Δθ represents the adjacent diffractive optical The change range of the tilt angle between the device unit and the X axis.

The depth h of the binary diffractive optical structure is related to the refractive index of the flexible material, which ranges from 350nm to 650nm.

The flexible material refers to a material that is transparent to visible light bands including red, green, and blue light, soft and bendable, and includes thermoplastic or photoresist materials.

The thermoplastics include polyethylene terephthalate PET, polyvinyl chloride PVC or polycarbonate PC.

The photoresist material includes polydimethylsiloxane PDMS or photosensitive polyimide photoresist PSPI.

The technical idea of the present invention is to change the phase distribution of the laser beam by making a variable-angle array diffractive optical device on a single piece of flexible material, using the moving diffractive optical microstructure, and destroying the spatial coherence of the laser, thereby achieving the effect of suppressing speckle Effect.

Furthermore, by using the bending of the flexible material, N groups of different one-dimensional binary diffractive optical structures are superimposed on each other to form a two-dimensional optical code based on the double-sided one-dimensional diffractive optical microstructure; The optical structure changes dynamically to achieve the full-band laser speckle suppression effect and improve the laser speckle suppression rate.

Furthermore, since the crawler transmission is repeated, it effectively avoids the change of the movement speed during the reciprocating mechanical movement, and reduces the system damage caused by the impact of the mechanical movement and the interference noise caused by the change of the movement speed.

Furthermore, by inventing the variable-angle array structure, the technical effect of two-dimensional displacement is realized when only one-dimensional movement is required.

The beneficial effects of the present invention are mainly manifested in: (1) The use of flexible materials makes crawler-type continuous movement possible. (2) Multiple groups of diffractive optical microstructures are fabricated on a single sheet material, with small size and high efficiency. (3) Using the bending of flexible materials and continuous crawler movement, N groups of different one-dimensional binary diffractive optical structures are superimposed and dynamically changed, theoretically achieving full-band laser speckle suppression. (4) By inventing the variable-angle array structure, the technical effect of two-dimensional displacement is realized when only one-dimensional movement is required. (5) The crawler movement is used instead of the reciprocating mechanical movement, which has a more stable speckle suppression effect and less noise interference, and also makes the whole structure more stable. (6) The entire speckle suppression system includes red, green, and blue laser light sources. The hardware realizes full-band laser speckle suppression, and the system structure is simple and compact, stable, good versatility, high efficiency, and low energy consumption.

Description of drawings

Fig. 1 is a schematic diagram of the diffractive device unit in the flexible variable-angle array diffractive optical device of the present invention (the optical microstructure is M sequence as an example).

Fig. 2 is a schematic diagram of the array arrangement of the flexible variable-angle array diffractive optical device of the present invention.

Fig. 3 is a schematic diagram of a flexible variable-angle array diffractive optical device and its realization system of the present invention, wherein, 1 is a red laser and its calibration lens; 2 is a green laser and its calibration lens; 3 is a blue laser and its calibration lens; 4 5 is a spectroscopic sheet that transmits red light and reflects green light and blue light; 5 is a spectroscopic sheet that transmits red light and green light and reflects blue light; 6 is an aperture; 7 is a flexible variable-angle array diffractive optical device and its crawler transmission device of the present invention; 8 is an imaging lens; 9 is a projection screen; 10 is a CCD camera and its computer processing system.

Fig. 4 is a schematic diagram of the flexible variable-angle array diffractive optical device of the present invention and its crawler-type transmission device and transmission mode, wherein, 1 is the position where the laser is irradiated on the flexible variable-angle array diffractive optical device of the present invention; 3 is the gear connected to the stepping motor; 4 is two springs that provide tension for the flexible variable-angle array diffractive optical device of the present invention; 5 is the track that controls the flexible variable-angle array diffractive optical device of the present invention to perform crawler movement The electrical control module; 6 indicates that the second rotating column is fixed with a spring, so that the flexible variable-angle array diffractive optical device of the present invention is always in a stretched state.

Fig. 5 is a technical principle diagram of realizing two-dimensional displacement effect by using one-dimensional direction movement in the present invention.

Fig. 6 is the result diagram of the speckle suppression of the red laser by the flexible variable-angle array diffractive optical device and its realization system of the present invention, Fig. 6 (a) the light field distribution before speckle suppression, Fig. 6 (b) after speckle suppression light field distribution.

Fig. 7 is the result diagram of speckle suppression for green laser by the flexible variable-angle array diffractive optical device and its realization system of the present invention, Fig. 7(a) light field distribution before speckle suppression, Fig. 7(b) after speckle suppression light field distribution.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 to 7, a realization system of a flexible variable-angle array diffractive optical device includes a mechanical module, an electrical control module, and an optical module. The optical module includes a laser, a calibration lens, an aperture, and a flexible variable-angle array diffractive optical device. device, imaging lens, projection screen and CCD camera and computer processing system, the laser can be a monochromatic laser of any wavelength in the visible light range, the laser, calibration lens, aperture, flexible variable-angle array diffractive optics and imaging The lenses are located on the same optical axis; the mechanical module includes a crawler conveyor; the electrical control module includes a driving motor for driving the crawler conveyor to rotate and then drive the flexible variable-angle array diffractive optical device to realize the crawler movement.

Further, the mechanical module includes a frame, two rotating columns and a spring, one rotating column can be translated left and right and rotatably set on one side of the frame, one end of the spring is connected to the one rotating column, the The other end of the spring is fixed on the frame; the other rotating column is rotatably set on the other side of the frame, and the other rotating column is connected with the output shaft of the drive motor, and the flexible variable angle array The diffractive optical device is wound on the two rotating columns, and the tension of the spring makes the flexible variable-angle array diffractive optical device always in a stretched state.

Still further, a driving gear is installed on the output shaft of the driving motor, a driven gear is installed on the outer end of the other rotating column, and the driving gear meshes with the driven gear. Of course, other transmission modes are also possible.

The driving motor is a stepping motor.

The diameter of the two columns is 4 millimeters; the two springs are installed on a rotating column, and the electrical control module includes a stepper motor and a controller for driving the stepper motor, and the controller is programmed in advance The control program control, the main control parameters are to start the crawler transmission, stop the crawler transmission and the speed of the crawler transmission, and the speed of the crawler transmission is 100rpm/min.

The optical module may include, but is not limited to, a red laser and its calibration lens, a green laser and its calibration lens, a blue laser and its calibration lens, a spectroscopic sheet that transmits red light and reflects green light and blue light, and transmits red light and green light. A spectroscopic plate reflecting blue light, an aperture, the flexible variable-angle array diffractive optical device, an imaging lens, a projection screen, a CCD camera and a computer processing system thereof. The red laser and its calibration lens, the spectroscopic sheet that transmits red light and reflects green light and blue light, the spectroscopic sheet that transmits red light and green light and reflects blue light, the aperture, the flexible variable-angle array diffractive optical device and the imaging lens are located at On the same optical axis and the main optical axis, the optical axes of the green laser and its calibration lens, the blue laser and its calibration lens are perpendicular to the main optical axis; the green laser emitted by the green laser passes through the red light The spectroscopic sheet reflecting green light and blue light enters the main optical path, and the blue laser light emitted by the blue laser enters the main optical path through the spectroscopic sheet reflecting blue light through red light and green light.

When only the red laser is turned on, the red laser beam is incident on the flexible variable-angle array diffractive optical device of the present invention through the spectroscopic sheet that transmits red light and reflects green light and blue light, the spectroscopic sheet that transmits red light and green light reflects blue light, and the aperture Above, the controller in the electrical module drives the stepping motor, and the stepping motor drives the crawler conveyor in the mechanical module to perform crawler movement. The different diffractive optical microstructures on the front and rear layers of the flexible variable-angle array diffractive optical device dynamically superposition, modulating the red laser beam. The projection screen records laser projection images and allows direct visual observation. The CCD camera records the laser projection imaging on the projection screen and inputs it into a computer for subsequent data processing.

When only the green laser is turned on, the green laser beam is reflected into the main optical path by the beam splitter that transmits red light and reflects green light and blue light, and then enters the flexible On the variable-angle array diffractive optical device, the controller in the electrical module drives the stepping motor, and the stepping motor drives the crawler conveyor in the mechanical module to perform crawler movement. The front and rear layers of the flexible variable-angle array diffractive optical device Different diffractive optical microstructures are dynamically superimposed to modulate the green laser beam. The projection screen records laser projection images and allows direct visual observation. The CCD camera records the laser projection imaging on the projection screen and inputs it into a computer for subsequent data processing.

When only the blue laser is turned on, the blue laser beam is reflected by the beam splitter that passes through the red light and green light and reflects the blue light into the main optical path, and then passes through the diaphragm and is incident on the flexible variable-angle array diffractive optical device of the present invention. The electrical module The controller in the system drives the stepping motor, and the stepping motor drives the crawler conveyor in the mechanical module to perform crawler movement. The different diffractive optical microstructures on the front and rear layers of the flexible variable-angle array diffractive optical device are dynamically superimposed, and the blue modulated laser beams. The projection screen records laser projection images and allows direct visual observation. The CCD camera records the laser projection imaging on the projection screen and inputs it into a computer for subsequent data processing.

When the red and green lasers are turned on at the same time, the red laser beam passes through the spectroscopic sheet that transmits red light and reflects green light and blue light, and mixes with the green laser beam that enters the main optical path reflected by the spectroscopic sheet that transmits red light and reflects green light and blue light to form yellow light. , the yellow light passes through the red light and green light and reflects the blue light through the beam splitter and the aperture, and is incident on the flexible variable angle array diffractive optical device of the present invention, the controller in the electrical module drives the stepping motor, and the stepping motor drives the mechanical The crawler conveyor in the module performs crawler movement, and the different diffractive optical microstructures on the front and rear layers of the flexible variable-angle array diffractive optical device are dynamically superimposed to modulate the yellow light. The projection screen records laser projection images and allows direct visual observation. The CCD camera records the laser projection imaging on the projection screen and inputs it into a computer for subsequent data processing.

When the red, green and blue lasers are turned on at the same time, the red laser beam passes through the spectroscopic sheet that reflects green and blue light through red light, and mixes with the green laser beam that is reflected by the spectroscopic sheet that reflects green and blue light through red light and enters the main optical path Yellow light is formed, and the yellow light passes through the spectroscopic sheet that reflects blue light through red light and green light, and is mixed with the blue laser beam reflected into the main optical path by the spectroscopic sheet that passes through red light and green light and reflects blue light to form white light, and the white light is then Through the aperture, it is incident on the flexible variable-angle array diffractive optical device of the present invention, the controller in the electrical module drives the stepping motor, and the stepping motor drives the crawler-type transmission device in the mechanical module to perform crawler movement. Different diffractive optical microstructures on the front and rear layers of the angular array diffractive optical device are dynamically superimposed to modulate white light. The projection screen records laser projection images and allows direct visual observation. The CCD camera records the laser projection imaging on the projection screen and inputs it into a computer for subsequent data processing.

The flexible variable-angle array diffractive optical microstructure of the present invention is made on PDMS flexible material, and is formed by connecting three groups of one-dimensional binary diffractive optical structures head to tail. The one-dimensional binary diffractive optical structure is an optical microstructure based on M sequence (see accompanying drawing 1 and accompanying drawing 2), and its one-dimensional binary diffractive optical structure pattern is represented by parameter T, and described parameter T is optical microstructure The minimum unit width of , the widths of all optical microstructures are represented by integer multiples of T, and the total width of the one-dimensional binary diffractive optical structure pattern is represented by T ₀ . The depth of the one-dimensional binary diffractive optical structure is h, and the inclination angle between the one-dimensional binary diffractive optical structure and the X axis is θ ₀ .

The T parameter is 4 microns, the depth h of the one-dimensional binary diffractive optical structure is 400 nanometers, and the M sequence code is a 31-bit code, that is, 1111100110100100001010111011000. The inclination angles between the three groups of one-dimensional binary diffractive optical structures and the X-axis are 44.4°, 45°, and 45.6° respectively, and the head of the first group of diffractive optical structures and the The tail connection of the third group of diffractive optical structures.

Referring to accompanying drawings 1, 3 and 5, the flexible variable-angle array diffractive optical device is bent along the Y axis and connected end to end to form a crawler structure. The crawler-type flexible variable-angle array diffractive optical device includes two layers, front and rear, and each layer contains (N/2) groups of one-dimensional binary diffractive optical microstructures. When the laser beam is irradiated on the crawler-type flexible variable-angle array diffractive optical device, the light beam passes through the front and rear two layers of flexible variable-angle array diffractive optical microstructures, although the N one-dimensional The binary diffractive optical microstructures are all one-dimensional structures, but the superposition of the front and rear flexible variable-angle array diffractive optical microstructures turns the original one-dimensional diffractive optical device into a two-dimensional diffractive optical device. When performing crawler movement, the front and rear flexible variable-angle array diffractive optical microstructures move at the same speed and in opposite directions. Therefore, the flexible variable-angle array diffractive optical device of the present invention can realize red, green, and blue full-band lasers. Speckle suppression.

Still further, the crawler-type flexible variable-angle array diffractive optical device is fixed on two rotating columns, and the two rotating columns are installed on a crawler conveyor based on gear transmission, and one of the two rotating columns Two springs are connected to the root, and the springs exert tension on the rotating column, so that the crawler-type flexible variable-angle array diffractive optical device is always in a stretched state. The gears are mounted on the bottom of the rotating column and controlled by an electrical control module. The electrical control module is driven by a stepping motor to control the flexible variable angle array diffractive optical device to perform continuous crawler movement.

The working principle of the implementation system of a flexible variable-angle array diffractive optical device of the present invention is as follows:

1) Calculation formula of speckle contrast SC:

where σ is the standard deviation of the light intensity distribution, is the average light intensity distribution. The starting point of most speckle reduction methods is to average the light intensity distribution.

2) A flexible variable-angle array diffractive optical device of the present invention is composed of N groups of one-dimensional binary diffractive optical structures connected end to end. The one-dimensional binary diffractive optical structures include but not limited to grating structures, optical microstructures based on pseudo-random sequences, optical microstructures based on M sequences, and optical microstructures based on Barker codes. Taking the optical microstructure based on M-sequence as an example, the principle of the crawler-type flexible variable-angle array diffractive optical device to suppress speckle is: there are two basic factors that affect the effect of laser speckle suppression: the direction of motion and the direction of motion during motion. speed. Use the linear displacement in the X-axis direction and the Y-axis direction to determine the influence of the motion direction and speed on the speckle suppression effect. The theoretical calculation formula is as follows:

Where D is the projection width of the human eye resolution unit on the screen, x ₁ , x ₂ , y ₁ , y ₂ are the coordinates where the laser beam is projected onto the screen through two binary diffractive optical structures moving along different axes, H(x ₁ ,x ₂ ,y ₁ ,y ₂ ) and H(x ₁ ,x ₁ ,y ₁ ,y ₁ ) are the autocorrelation functions of the laser beam at the screen plane modulated by the M-sequence binary optical diffraction elements :

Where Δt is the exposure time of the human eye; V ₁ is the moving speed of the binary optical diffraction element image on the screen along the Y-axis direction, V ₂ is the moving speed along the X-axis direction; T ₀ is a period of the binary optical diffraction element The minimum unit length within ; M is a non-zero integer; T (x, y, V, t) is the transmission coefficient function of the binary optical diffraction element.

Referring to FIG. 6 , it is the implementation system of a flexible variable-angle array diffractive optical device of the present invention, and the speckle suppression result when only the red laser is turned on. Referring to FIG. 7 , it is the implementation system of a flexible variable-angle array diffractive optical device of the present invention, and the speckle suppression result when only the green laser is turned on.

Claims (10)

1. a kind of flexible varied angle slot array diffraction optical device realizes system, it is characterised in that：It is described to realize that system includes machine Tool module, electricity control module and optical module, the optical module include laser, calibration lens, diaphragm, flexible varied angle Array diffraction optical device, imaging len, projection screen and CCD camera and computer processing system, the laser are visible The mono-colour laser of any wavelength in optical range, the laser, calibration lens, diaphragm, flexible varied angle slot array diffraction light Learn device and imaging len is located in same optical axis；

The mechanical module includes crawler type conveyer；The electricity control module includes being used to drive crawler type conveyer The motor for rotating and then driving flexible varied angle slot array diffraction optical device to realize crawler type motion.

2. a kind of flexible varied angle slot array diffraction optical device as claimed in claim 1 realizes system, it is characterised in that：Institute Stating mechanical module includes frame, two Rotary cloumns and spring, and Rotary cloumn left and right translation and can be rotatably sleeved on The side of frame, the spring one end are connected with a Rotary cloumn, and the other end of the spring is fixed in frame；Separately A piece Rotary cloumn is rotatably sleeved on the opposite side of frame, and the output shaft of another Rotary cloumn and motor passes Dynamic connection, the flexible varied angle slot array diffraction optical device are wound on two Rotary cloumns, and the pulling force of the spring makes Obtain flexible varied angle slot array diffraction optical device and be in extended state all the time.

3. a kind of flexible varied angle slot array diffraction optical device as claimed in claim 2 realizes system, it is characterised in that：Institute State and driving gear is installed on the output shaft of motor, the outer end installation driven gear of another Rotary cloumn, the master Moving gear engages with the driven gear.

4. a kind of flexible varied angle slot array diffraction optical device as described in one of claims 1 to 3 realizes system, its feature It is：The motor is stepper motor.

5. a kind of flexible varied angle slot array diffraction optical device as described in one of claims 1 to 3 realizes system, its feature It is：The optical module includes red laser and its calibration lens, green (light) laser and its calibration lens, blue laser And its calibration lens, the light splitting piece through reflection to red light green glow blue light, the light splitting piece through feux rouges green reflection blue light；It is described red Light laser and its calibration lens, the light splitting piece through reflection to red light green glow blue light, the light splitting through feux rouges green reflection blue light Piece, diaphragm, the property varied angle slot array diffraction optical device and imaging len are located in same optical axis, and are primary optical axis, described The optical axis of green (light) laser and its calibration lens, blue laser and its calibration lens is vertical with primary optical axis, the green laser The green laser that device is sent enters main optical path by the light splitting piece through reflection to red light green glow blue light, and the blue laser is sent Blue laser by entering main optical path through the light splitting piece of feux rouges green reflection blue light.

6. a kind of flexible varied angle slot array diffraction optical device as described in one of claims 1 to 3 realizes system, its feature It is：The flexible varied angle slot array diffraction optical device is produced on flexible material, by N group one-dimensional binary diffractive optical structures Head and the tail are formed by connecting, and the one-dimensional binary diffractive optical structure includes optical grating construction and optical microstructures, described one-dimensional to refer to spread out It is one-dimensional patterns to penetrate optical texture, and the binary refers to because the optical path difference that diffractive optical structure depth is formed is binaryzation.

7. a kind of flexible varied angle slot array diffraction optical device as claimed in claim 6 realizes system, it is characterised in that：Institute One-dimensional binary diffractive optical structure pattern is stated to be represented by parameter T, the parameter T be optical microstructures minimum unit width, institute The width for having optical microstructures represents that the overall width of the one-dimensional binary diffractive optical structure pattern is used with T integral multiple T₀Represent；The depth of the one-dimensional binary diffractive optical structure is h, is inclined folded by the one-dimensional binary diffractive optical structure and X-axis Angle is θ₀。

8. a kind of flexible varied angle slot array diffraction optical device as claimed in claim 6 realizes system, it is characterised in that：Institute Optical microstructures are stated for the optical microstructures based on pseudo-random sequence, the optical microstructures based on M sequence or based on Barker code Optical microstructures.

9. a kind of flexible varied angle slot array diffraction optical device as claimed in claim 6 realizes system, it is characterised in that：Institute It is positive integer to state N, represents the array number included in flexible varied angle slot array diffraction optical device, N=1,2,3 ... ∞, works as N When=1, the flexible varied angle slot array diffraction optical device suppressed for laser speckle is single diffraction optical device, that is, is spread out Optical device unit is penetrated, the structural parameters identical one-dimensional binary that each diffraction optical device unit includes m cycle spreads out Penetrate optical texture pattern；As N≤2, the flexible varied angle slot array diffraction optical device suppressed for laser speckle is bag Diffraction optical device containing N number of array；N number of diffraction optical device unit in the array is disposably produced on monolithic flexibility material On material, the one-dimensional binary diffractive optical structure pattern inside N number of diffraction optical device unit in its array is identical or differs, N groups one-dimensional binary diffractive optical structure head and the tail connect, along Y direction by the head and N groups of the 1st group of diffractive optical structure The tail of diffractive optical structure is connected.

10. realizing system with a kind of flexible varied angle slot array diffraction optical device as claimed in claim 9, its feature exists In：N number of diffraction optical device unit in array is different from inclination angle folded by X-axis, is expressed as θ_±i, wherein θ_±i=θ₀±(N-1)/ 2 Δ θ ± i Δ θ, Δ θ represent neighboring diffraction optical device unit and the amplitude of variation at inclination angle folded by X-axis.