CN110877456B - High-efficiency rotary scanning plane imaging device and method - Google Patents
High-efficiency rotary scanning plane imaging device and method Download PDFInfo
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- CN110877456B CN110877456B CN201911258576.7A CN201911258576A CN110877456B CN 110877456 B CN110877456 B CN 110877456B CN 201911258576 A CN201911258576 A CN 201911258576A CN 110877456 B CN110877456 B CN 110877456B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005452 bending Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 abstract description 11
- 230000000750 progressive effect Effects 0.000 description 5
- 241000226585 Antennaria plantaginifolia Species 0.000 description 4
- 238000000016 photochemical curing Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/124—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified
- B29C64/129—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask
- B29C64/135—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using layers of liquid which are selectively solidified characterised by the energy source therefor, e.g. by global irradiation combined with a mask the energy source being concentrated, e.g. scanning lasers or focused light sources
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/264—Arrangements for irradiation
- B29C64/268—Arrangements for irradiation using laser beams; using electron beams [EB]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/386—Data acquisition or data processing for additive manufacturing
- B29C64/393—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
Abstract
The invention relates to a high-efficiency rotary scanning plane imaging device and a method, wherein the device comprises a linear module, a rigid support is arranged on a moving platform of the linear module, a rotating mirror motor and a laser are arranged on the rigid support, an output shaft of the rotating mirror motor is tightly matched with a central hole of a polygon mirror, a plurality of reflecting surfaces are distributed on the circumference of the polygon mirror in an equal-dividing manner, and the rotating mirror motor can drive the polygon mirror to rotate continuously; the laser beam emitted by the laser device is opposite to the positive section of the polygon mirror and obliquely points to the central axis of the polygon mirror, and the formed reflected beam forms a light spot on an imaging surface above the linear module; when the rotating mirror motor drives the polygon mirror to continuously rotate, the reflected light beams are sequentially deflected by a plurality of reflecting surfaces, so that light spots are scanned back and forth on the imaging surface to generate a curved scanning line; an image sensor is disposed above the imaging surface for converting the curved scan line into a digitized pixel map to determine the line and column positions of each projected pixel in the curved scan line in the rectangular imaging region. The invention has simple light path and small energy loss of laser beam, the maximum optical scanning angle is close to 2 times of the circumferential indexing angle of the reflecting surface, and the influence of the pillow shape distortion of the scanning line on the imaging precision can be effectively solved.
Description
Technical Field
The invention relates to the field of three-dimensional printers, in particular to a high-efficiency rotary scanning plane imaging device and method.
Background
The polygon mirror rotary scanning device adopts a prism mirror with a regular polygon cross section, and can output hundreds to thousands of laser scanning lines per second in cooperation with a high-speed spindle, so that the polygon mirror rotary scanning device is widely applied to equipment such as a laser printer, high-resolution optical image acquisition and the like, has the advantages of high scanning speed, stable operation, small motor heating, low noise and the like. In order to eliminate pincushion distortion of scanning lines on a planar imaging surface, conventional polygon mirror rotary scanning devices commonly employ normal-section incident light paths. The pincushion distortion is derived from a deflection reflection structure of a polygon mirror, when an included angle alpha exists between an incident light beam and the positive section of the mirror, and when the reflected light beam reaches an imaging surface, a projection height h is arranged on the imaging light spot relative to the positive section at the incident point, and h is the product of a reflection light path d and a sine function value of the included angle alpha; because the reflected optical path d changes along with the deflection of the polygon mirror, the imaging light spot scanning line presents a pillow-shaped bending form with central symmetry on the plane imaging surface, and the imaging light spot scanning line is a straight line only when the included angle alpha is zero, namely, a normal-section incident optical path is adopted. However, in practice, the use of a normal-section incident light path is extremely prone to cause geometric interference between the laser light source and the reflected beam, and for this reason, the effective deflection angle of the polygon mirror has to be limited, so that the laser scanning window is narrowed. This not only reduces the scan bandwidth, but also directly leads to low laser power utilization.
In recent years, the rapidly developed additive technology promotes an ultraviolet laser scanning imaging device with a wavelength of 355nm to 405nm to be widely applied to various photo-curing three-dimensional printers. The most common is a galvanometer type two-axis linkage scanning galvanometer, the vector scanning mode has high utilization rate of the nominal power of the laser, but when complex patterns are processed, the average scanning line speed is greatly reduced by frequent vector turning and idle stroke jumping, so that the high-speed printing of complex parts is difficult to realize. Recently, patent documents and media data disclose photo-curing three-dimensional printing technologies based on Micro Electro Mechanical Systems (MEMS) high-speed micro-mirrors and multi-mirror rotary scanning devices, but printing precision and precision stability of the former are still to be improved, and the problem of low utilization efficiency of lasers by the latter still exists, particularly the occupation ratio of ultraviolet lasers in the total cost of the photo-curing three-dimensional printer is high for a long time, so that the cost efficiency of the whole machine is low. There are also reports of technical schemes for correcting pincushion distortion by adopting a multi-reflection optical path and improving the utilization efficiency of a laser, but the problems of energy loss caused by the multi-reflection of laser beams due to complex optical path structure are still to be solved. At present, aiming at the urgent need of further improving the utilization efficiency of a laser, in the field of laser scanning imaging, a high-efficiency rotary scanning plane imaging method which has the advantages of simple light path, small energy loss of laser beams and wide scanning window and can effectively solve the influence of pillow shape distortion of scanning lines on imaging precision is lacking.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a high-efficiency rotary scanning plane imaging device and a high-efficiency rotary scanning plane imaging method, wherein the optical path is simple, the energy loss of a laser beam is small, the maximum optical scanning angle is close to 2 times of the circumferential indexing angle of a reflecting surface, and the influence of the pincushion distortion of a scanning line on the imaging precision can be effectively solved.
The invention solves the technical problems by adopting the technical scheme that: the high-efficiency rotary scanning plane imaging device comprises a linear module, wherein a rigid support is arranged on a moving platform of the linear module, a rotating mirror motor and a laser are arranged on the rigid support, an output shaft of the rotating mirror motor is tightly matched with a central hole of a polygon mirror, a plurality of reflecting surfaces are distributed on the circumference of the polygon mirror in an equal-division manner, and the rotating mirror motor can drive the polygon mirror to continuously rotate; the laser beam emitted by the laser device is opposite to the positive section of the polygon mirror and obliquely points to the central axis of the polygon mirror, and the formed reflected beam forms a light spot on an imaging surface above the linear module; when the rotating mirror motor drives the polygon mirror to continuously rotate, the reflected light beams are sequentially deflected by a plurality of reflecting surfaces, so that light spots are scanned back and forth on the imaging surface to generate a curved scanning line; an image sensor is disposed above the imaging surface for converting the curved scan line into a digitized pixel map to determine the line and column positions of each projected pixel in the curved scan line in the rectangular imaging region.
Preferably, three reflecting surfaces are equally distributed on the circumference of the polygon mirror.
Preferably, the scanning controller is respectively connected with the linear module, the rotary mirror motor, the laser and the image sensor.
Preferably, the scanning controller is internally provided with a first decoder module, a second decoder module, a line scanning control module, a column scanning control module, a line correcting module and a laser control module, the rotating mirror motor is connected with the first decoder module, the first decoder module is connected with the line scanning control module, the linear module is connected with the second decoder module, the second decoder module is connected with the column scanning control module, the line scanning control module and the column scanning control module are connected with the line correcting module, the line correcting module is connected with the laser control module, and the laser control module is connected with the laser.
A high-efficiency rotary scanning plane imaging method comprises the steps that a linear module drives a multi-surface reflecting mirror rotary scanning device formed by combining a rigid support, a rotary mirror motor, a laser and a multi-surface reflecting mirror to move from a scanning starting line to a scanning ending line; during the movement of the linear module, the curved scanning lines projected by the polygon mirror are arranged on the imaging surface line by line along the movement direction of the linear module to form a scanning area; the linear module continues to move and reaches the scanning termination time, and the scanning area extends forwards along the movement of the linear module until the rectangular imaging area of the imaging surface is completely covered; in the moving process of the linear module, when the instantaneous imaging pixels in the curved scanning line are positioned in the rectangular imaging area, the scanning controller outputs the pixel gray value of the corresponding position of the current scanning plane image as the brightness control signal of the laser, so that the brightness of each imaging pixel in the rectangular imaging area is consistent with that of the plane image.
The rotary mirror motor is internally provided with a rotary encoder, the rotary mirror motor drives the polygon mirror to rotate for 1 circle, and the rotary encoder outputs m increment pulses and 1 synchronization pulse to the scanning controller; the scan controller decodes the incremental pulse signal and the synchronization pulse of the rotary encoder: each increment pulse count register value is increased by 1, when the count register value is increased to m, the reset is carried out, and when the synchronization pulse is received, the count register is set as an initial value; when the value of the counting register is {0, m/n,2m/n … (n-1) ×m/n }, the scanning controller generates row synchronizing signals of the reflecting surfaces 1 to n, and the scanning controller adjusts the initial value of the counting register between 1 and m/n so that the row synchronizing signals coincide with the initial scanning angles of the reflecting surfaces; the scanning line comprises k pixels, and the scanning controller performs equidistant division on the system clock number of the line synchronization signal period according to the reflected light path parameters to obtain a clock interval table of pixels from No. 1 to k; the scanning controller inquires the position of the system clock count value in the clock interval table in real time in each line synchronizing signal period to determine the pixel number of the projection pixel in the scanning line, and calculates the line position of the scanning line in the imaging plane in real time according to the linear module position signal to determine the column number of the projection pixel in the plane image data; and the scanning controller outputs the gray value of the corresponding pixel in the current projection plane image data as a laser brightness control signal according to the obtained pixel number and the column number.
The laser beam emitted by the laser device is directed to the polygon mirror at an included angle alpha relative to the positive section of the polygon mirror; when the linear module is static, the reflected light beam generates a curved scanning line with central symmetry on an imaging surface, and in order to compensate imaging distortion generated by the curved scanning line, a rotating mirror imaging calibration is required; for this reason, the scanning controller sends the locating signal to the straight line module first, control the straight line module to locate the line position of the crooked scanning line under the image sensor; the scan controller projects k specially constructed single row pixel maps in sequence: only 1 pixel gray value of each single-row pixel map is the maximum value, the gray values of the rest pixels are all 0, and the numbers of the pixels with the maximum gray values are arranged from 1 to k according to the projection sequence; the scanning controller controls the image sensor, and converts a curved scanning line of the imaging surface into a digital pixel map during the process of projecting each single-line pixel map by the rotating mirror, so as to identify the actual pixel position of a highlight light spot in the map on the imaging surface, and establish a row-column deviation table of the projected pixel position (row position and pixel number) and the imaging pixel position (row position and column position); the motion direction of the linear module is orthogonal to the rotation scanning direction of the rotating mirror, and when the linear module drives the rotating mirror and the bending scanning line to be positioned at different line positions, the line-row deviation table of the projection pixel position of the scanning controller and the imaging pixel position of the imaging surface is unchanged.
When the rotating mirror performs continuous progressive scanning, the total line number of the imaging surface is q, the scanning controller sends a motion signal to the linear module, and the linear module is controlled to drive the rotating mirror and the curved scanning line to stably move from the 1 st line to the q line of the imaging surface; during the movement of the linear module, the scanning controller calculates the line position of the curved scanning line in real time according to the position of the linear module and the line spacing, comprehensively obtains the line and row positions of real-time projection pixels in the curved scanning line according to the system clock count value of the line synchronizing signal period, and further inquires a line and row deviation table established in the imaging calibration link of the rotating mirror to obtain line and row deviation values of the real-time projection pixels and the imaging pixel positions; the scanning controller compensates the row and column deviation value obtained by inquiry to a real-time projection pixel position, obtains the row and column position of the actual imaging pixel position in the projection plane image data, and outputs the gray value of the pixel at the row and column position as a laser brightness control signal; the process of outputting the pixel gray value as the laser brightness control signal is continuously carried out in the process of moving the linear module to q rows until all pixels of the projected planar image data are output according to the moving sequence of scanning light spots on the imaging surface, so that the planar image is reconstructed on the imaging surface through progressive scanning movement of single-point imaging light spots.
When the reflecting surface of the rotating mirror deflects and reflects an incident light beam, the reflected light beam and the incident light beam are distributed on two sides of the normal section of the rotating mirror at a reflecting point, and the reflected light beam does not overlap and interfere with the incident light beam within the deflection angle range of the reflecting surface; when the light spot width is not counted, the maximum optical scanning angle of the reflecting surface of the rotating mirror can be 2 times of the circumferential indexing angle of the reflecting surface, correspondingly, the maximum duty ratio of the line synchronizing signal of the reflecting surface of the rotating mirror can be 100 percent, namely, at any moment in the progressive scanning period of the rotating mirror, the output light beams of the laser are all used for reconstructing the plane image to be projected on the imaging surface, and the brightness of the real-time light beams of the laser are all in one-to-one correspondence with the pixel gray value of the plane image to be projected; the laser of the present invention is not forced to be turned off because the reflected beam cannot reach the imaging surface.
When the linear module drives the rotary mirror to scan continuously line by line, the curved scanning lines are arranged line by line and cover a rectangular imaging area of an imaging surface, when instantaneous imaging pixels of the curved scanning lines enter the rectangular imaging area, the scanning controller outputs gray values of corresponding pixels in the projected planar image data as laser brightness control signals according to row-column positions of the instantaneous imaging pixels in the rectangular imaging area, so that the brightness of the instantaneous imaging pixels of the rectangular imaging area is consistent with the gray values of the planar image data all the time, and a scanning image with brightness distribution consistent with the planar image data is reconstructed in the imaging area;
according to the high-efficiency rotary scanning plane imaging method, a curved scanning line of the rotary mirror on the imaging surface is not required to be corrected into a straight line by adopting a precise optical element, and the direction of the scanning line in the rectangular imaging area is not required to be accurately adjusted, so that the scanning line direction is overlapped with the row direction of the rectangular imaging area; the invention has simple light path, and the mounting deviation of the laser and the imaging surface relative to the rotating mirror can be compensated through the imaging calibration link of the rotating mirror; the laser beam emitted by the laser device is directly imaged after being reflected by the rotating mirror for 1 time, so that the laser beam energy loss is small and the efficiency is high; the laser has short passive closing time and high utilization rate in the continuous progressive scanning process, has reasonable scheme and can be popularized and applied in various laser scanning photocuring three-dimensional printers.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a control signal connection diagram of an embodiment of the present invention;
FIG. 3 is a schematic view of progressive scan planar imaging in accordance with an embodiment of the present invention;
FIG. 4 is a logic diagram of laser brightness control according to an embodiment of the present invention;
reference numerals illustrate: the laser device comprises a linear module 1, a rigid support 2, a rotating mirror motor 3, a laser 4, a laser beam 41, a reflected beam 42, a polygon mirror 5, a first reflecting surface 51, a second reflecting surface 52, a third reflecting surface 53, an imaging surface 6, a light spot 61, a curved scanning line 62, a rectangular imaging area 63, an image sensor 7, a scanning controller 100, a first decoder module 101, a second decoder module 102, a line scanning control module 103, a column scanning control module 104, a line and column correction module 105 and a laser control module 106.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
examples:
as shown in fig. 1, a high-efficiency rotary scanning plane imaging device is provided, a rigid support 2 is arranged on a moving platform of a linear module 1, a rotary mirror motor 3 and a laser 4 are arranged on the rigid support 2, an output shaft of the rotary mirror motor 3 is tightly matched with a central hole of a polygon mirror 5 (the polygon mirror in the embodiment is 3 faces), a first reflecting face 51, a second reflecting face 52 and a third reflecting face 53 are equally distributed on the circumference of the polygon mirror 5, and the rotary mirror motor 3 can drive the polygon mirror 5 to continuously rotate; the laser beam 41 emitted by the laser 4 is obliquely directed to the central axis of the polygon mirror 5 relative to the normal section of the polygon mirror 5, and the reflected beam 42 forms a light spot 61 on the imaging surface 6 above the linear module 1; when the rotating mirror motor 3 drives the polygon mirror 5 to continuously rotate, the reflected light beams 42 are sequentially deflected by the reflecting surfaces 51, 52 and 53, so that the light spots 61 are scanned back and forth on the imaging surface 6 to generate curved scanning lines 62, and each time the polygon mirror 5 rotates for 1 turn, the reflecting surfaces 51, 52 and 53 respectively drive the light spots 61 to perform 1 scanning movement on the imaging surface 6; above the imaging surface 6 is an image sensor 7. The image sensor 7 can convert the curved scan line 62 on the imaging surface 6 into a digitized pixel map to determine the line and column positions of the projected pixels in the curved scan line 62 in a rectangular imaging area 63.
As shown in fig. 2, a scanning controller 100 is connected with a linear module 1, the scanning controller 100 is connected with a turning mirror motor 3, the scanning controller 100 is connected with a laser 4, and the scanning controller 100 is connected with an image sensor 7; the scanning controller 100 sends out an electric signal to the linear module 1 to control the linear module 1 to drive a polygon mirror rotary scanning device formed by combining the rigid support 2, the rotating mirror motor 3, the laser 4 and the polygon mirror 5 to continuously move, and further, the rectangular imaging area 63 of the imaging surface 6 is scanned line by line through the curved scanning line 62; the scanning controller 100 sends out an electric signal to the rotary mirror motor 3 to control the rotary mirror motor 4 to drive the polygon mirror 5 to continuously rotate so as to drive the reflected light beam 42 to deflect and scan, so that the light spot 61 generates a curved scanning line 62 on the imaging surface 6; the scanning controller 100 sends out an electric signal to the image sensor 7 to control the image sensor 7 to collect the curved scanning line 62 on the imaging surface 6, and the collected digital pixel map is transmitted back to the scanning controller 100;
as shown in fig. 4, the scan controller 100 includes a first decoder module 101, a second decoder module 102, a row scan control module 103, a column scan control module 104, a row and column correction module 105, and a laser control module 106; the rotating mirror motor 3 outputs a rotating pulse signal to the first decoder module 101, and the first decoder module 101 outputs an angular position signal of the polygon mirror 5 to the line scanning control module 103; the linear module 1 outputs a displacement pulse signal to the decoder module two 102, and the decoder module two 102 outputs a position signal of the linear module 1 to the column scanning control module 104; the line scanning control module 103 outputs a real-time projection pixel number to the line and line correction module 105, the line scanning control module 104 outputs a curved scanning line position to the line and line correction module 105, and the line and line correction module 105 outputs a line position of a real-time imaging pixel to the laser control module 106 according to the pixel number of the real-time projection pixel and the line position of the curved scanning line; the laser control module 106 extracts the gray value of the corresponding pixel from the current projection plane image data according to the inputted row and column positions, and further converts the gray value into a brightness control signal to output to the laser 4.
As shown in fig. 3, a high-efficiency rotary scanning plane imaging method is that a linear module 1 drives a polygon mirror rotary scanning device formed by combining a rigid bracket 2, a rotating mirror motor 3, a laser 4 and a polygon mirror 5 to move from a scanning start line to a scanning end line; during the movement of the linear module 1, the curved scanning lines 62 projected by the polygon mirror 5 are arranged line by line on the imaging surface 6 along the movement direction of the linear module to form a scanning area 64; the linear module 1 continues to move and reaches the scan termination line, and the scan area 64 also expands forward along the movement of the linear module 1 until it completely covers the rectangular imaging area 63 of the imaging surface 6; when the instantaneous imaging pixels in the curved scanning line 62 are located in the rectangular imaging area 63 during the movement process of the linear module 1, the scanning controller 100 outputs the pixel gray scale value of the corresponding position of the current scanning plane image as the brightness control signal of the laser 4, so that the brightness of each imaging pixel in the rectangular imaging area 63 is consistent with that of the plane image.
According to the high-efficiency rotary scanning plane imaging method, the rotary encoder in the rotary mirror motor rotates for 1 circle, the output pulse signals are only used for generating row synchronous signals which are consistent with the quantity of reflecting surfaces, the pulse resolution of the encoder is irrelevant to the pixel density of a scanning line, and a low-resolution encoder can be adopted, so that the cost is low and the working rotation speed is high; the maximum duty ratio of the line synchronizing signal of the reflecting surface of the polygon mirror can reach 100%, the number of system clocks of the line synchronizing signal period is more, and the density of the partitionable pixels of the scanning line is higher under the same rotating speed and the same system clock frequency; the scanning controller of the invention can calibrate the imaging distortion caused by the bending scanning line on line through the image sensor, and can effectively avoid the imaging deviation caused by the structural deformation and displacement of the optical component of the scanning device in the long-term operation process.
In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention.
Claims (3)
1. The utility model provides a high efficiency rotation scanning plane image device, includes sharp module (1), characterized by: a rigid support (2) is arranged on a moving platform of the linear module (1), a rotating mirror motor (3) and a laser (4) are arranged on the rigid support (2), an output shaft of the rotating mirror motor (3) is tightly matched with a central hole of the polygon mirror (5), a plurality of reflecting surfaces are distributed on the circumference of the polygon mirror (5) in an equal-dividing manner, and the rotating mirror motor (3) can drive the polygon mirror (5) to continuously rotate; a laser beam (41) emitted by the laser (4) is opposite to the positive section of the polygon mirror (5) and is obliquely directed to the central axis of the polygon mirror (5), and the formed reflected beam (42) forms a light spot (61) on the imaging surface (6) above the linear module (1); when the rotating mirror motor (3) drives the polygon mirror (5) to continuously rotate, the reflected light beams (42) are sequentially deflected by a plurality of reflecting surfaces, so that light spots (61) are scanned back and forth on the imaging surface (6) to generate curved scanning lines (62); an image sensor (7) is arranged above the imaging surface (6) and is used for converting the bending scanning line (62) into a digital pixel diagram so as to determine the row and column positions of each projection pixel in the bending scanning line (62) in the rectangular imaging area (63); the scanning controller (100) is respectively connected with the linear module (1), the rotating mirror motor (3), the laser (4) and the image sensor (7), a first decoder module (101), a second decoder module (102), a row scanning control module (103), a column scanning control module (104), a row and column correction module (105) and a laser control module (106) are arranged in the scanning controller (100), the rotating mirror motor (3) is connected with the first decoder module (101), the first decoder module (101) is connected with the row scanning control module (103), the linear module (1) is connected with the second decoder module (102), the second decoder module (102) is connected with the column scanning control module (104), the row scanning control module (103), the column scanning control module (104) are connected with the row and column correction module (105), the row and column correction module (105) is connected with the laser control module (106), and the laser control module (106) is connected with the laser (4).
2. The high efficiency rotary scanning planar imaging apparatus of claim 1, wherein: three reflecting surfaces are equally distributed on the circumference of the polygon mirror (5).
3. A method of high efficiency rotational scan plane imaging using the apparatus of claim 1, characterized by: the linear module (1) drives a polygon mirror rotary scanning device formed by combining a rigid support (2), a rotating mirror motor (3), a laser (4) and a polygon mirror (5) to move from a scanning starting line to a scanning ending line; during the movement of the linear module (1), curved scanning lines (62) projected by the polygon mirror (5) are arranged on the imaging surface (6) line by line along the movement direction of the linear module (1) to form a scanning area (64); the linear module (1) continues to move and reaches the scanning termination time, and the scanning area (64) also extends forwards along the movement of the linear module (1) until the rectangular imaging area (63) of the imaging surface (6) is completely covered; when the instantaneous imaging pixels in the bending scanning line (62) are positioned in the rectangular imaging area (63) in the moving process of the linear module (1), the scanning controller (100) outputs the pixel gray value of the corresponding position of the current scanning plane image as a brightness control signal of the laser (4), so that the brightness of each imaging pixel in the rectangular imaging area (63) is consistent with that of the plane image.
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Denomination of invention: An efficient rotating scanning plane imaging device and method Granted publication date: 20230808 Pledgee: Zhejiang Jinhua Chengtai Rural Commercial Bank Co.,Ltd. Pledgor: HANGZHOU DEDI INTELLIGENT TECHNOLOGY Co.,Ltd. Registration number: Y2024980002475 |