CN117037876A - Digital film writing device and writing method - Google Patents
Digital film writing device and writing method Download PDFInfo
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- CN117037876A CN117037876A CN202310995800.0A CN202310995800A CN117037876A CN 117037876 A CN117037876 A CN 117037876A CN 202310995800 A CN202310995800 A CN 202310995800A CN 117037876 A CN117037876 A CN 117037876A
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
- G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
- G11C13/047—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using electro-optical elements
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/005—Reproducing
Abstract
The embodiment of the invention discloses a digital film writing device and a digital film writing method. The digital film writing device is used for exposing the gray-scale dot matrix image on the digital film and comprises a film motion unit, a controller, a displacement sensor, a film tooth hole detection sensor, a laser and an optical machine; the film movement unit is used for driving the digital film to move at a uniform speed; the film tooth hole detection sensor is used for detecting the number of the film tooth holes and providing a frame start signal for the controller; the displacement sensor is used for detecting the movement distance of the digital film and providing a trigger signal for the controller according to the movement distance of the digital film; and the controller controls the laser and the optical machine to expose at a preset position of the digital film according to the trigger signal. According to the technical scheme, the working mode of the core optical machine is changed, the digital film is adopted to run continuously at a constant speed, and the optical machine is used for scanning the line, so that flexible definition of the image size and improvement of the writing speed are realized, and the color gradation stability of the exposure pixels is optimized.
Description
Technical Field
The invention relates to the technical field of data storage, in particular to a digital film writing device and a digital film writing method.
Background
With the development of the Internet and big data technology, global data is explosively increased, and data storage becomes a research hotspot. The carriers currently available for long-term offline storage of data are digital film and glass media. The digital film and the glass medium are different from hard disk, CD and other modes depending on rotation access, and the storage area of the film, glass and other mediums can be utilized to the maximum by using the rectangular dot matrix image mode for storage, so as to achieve the purpose of mass storage.
In the field of digital films, a digital film writing device is a key device, a core optical machine of the device generally adopts a whole-frame writing mode, and the pixel width and height of each frame of image of the digital film exposed by the whole-frame writing mode are defined by the specification of an optical machine DMD chip, so that the following defects exist: the whole frame writing can not change the pixel specification of the image, has poor flexibility and has high requirement on the flatness stability of an exposure plane.
Disclosure of Invention
The embodiment of the invention provides a digital film writing device and a writing method, wherein the digital film writing device changes the working mode of a core optical machine, adopts the continuous uniform running of a digital film, and adopts the optical machine to carry out the line scanning working mode, thereby realizing flexible definition of the image size and improvement of the writing speed and optimizing the color gradation stability of an exposure pixel.
According to an aspect of the present invention, there is provided a digital film writing apparatus for exposing a gray-scale dot matrix image on a digital film, the digital film writing apparatus including a film moving unit, a controller, a displacement sensor, a film perforation detection sensor, a laser, and a light machine, the displacement sensor, the film perforation detection sensor, the laser, and the light machine being all connected to the controller;
the film motion unit is used for driving the digital film to move at a uniform speed;
the film perforation detection sensor is used for detecting the perforation number of the film and providing a frame start signal for the controller;
the displacement sensor is used for detecting the movement distance of the digital film and providing a trigger signal for the controller according to the movement distance of the digital film;
and the controller controls the laser and the optical machine to expose at a preset position of the digital film according to the trigger signal.
Optionally, the displacement sensor provides the trigger signal to the controller once every time the displacement sensor detects the movement of the digital film by a preset distance.
Optionally, the optical machine includes a digital micro-mirror device, and when the digital film is exposed, the light beam output by the laser is incident to the digital micro-mirror device, reflected by the digital micro-mirror device, and then incident to the digital film for exposure.
Optionally, the digital micromirror device includes a plurality of micromirrors arranged in an array, the micromirrors include a first state and a second state, when the micromirrors are in the first state, the light beam output by the laser is reflected to an exposure area of the digital film through the micromirrors, and when the micromirrors are in the second state, the light beam output by the laser is reflected to an area other than the exposure area of the digital film through the micromirrors.
Optionally, the digital micromirror device includes m×n columns of micromirrors, and the gray-scale dot matrix image includes n+1 gray scales;
wherein M, N are integers greater than or equal to 2.
Optionally, the controller outputs a row signal and a pulse width modulation signal according to the trigger signal;
the line signal is output to the optical machine to realize the line scanning control, the pulse width modulation signal is output to the laser to control the light emission of the laser, and the exposure of the digital film is realized in synchronization with the line signal.
Optionally, the controller controls the laser and the optical machine to expose a row of pixels on the digital film each time, and writes a whole frame of gray-scale dot matrix image after repeated cyclic exposure.
According to another aspect of the present invention, there is provided a digital film writing method, which is performed using the above digital film writing apparatus, the digital film writing method including:
s1, controlling the digital film writing device to start;
s2, the film motion unit drives the digital film to move at a uniform speed;
s3, detecting the number of film tooth holes by a film tooth hole detection sensor, triggering a frame start signal and transmitting the frame start signal to a controller;
s4, detecting the movement distance of the digital film by a displacement sensor, and providing a trigger signal to the controller according to the movement distance of the digital film;
and S5, the controller controls the laser and the optical machine to expose at the preset position of the digital film according to the trigger signal.
Optionally, the controller controls the laser and the light engine to expose a row of pixels on the digital film at a time, and after S5, the method further includes:
s6, executing S2-S5 circularly until the whole frame of gray-scale dot matrix image is written on the digital film.
Optionally, the optical bench includes a digital micromirror device, the digital micromirror device includes m×3 columns of micromirrors, the gray-scale dot matrix image includes 4 gray scales, and the exposure process of the 4 gray-scale image includes:
the controller receives a first trigger signal of the displacement sensor, a first row of micromirrors of the digital micromirror device exposes at the blank of the digital film, and other rows of micromirrors default to be dark;
the controller receives a second trigger signal of the displacement sensor, a first row of micromirrors of the digital micromirror device is arranged at a blank position of the digital film, a second row of micromirrors is overlapped in a first exposure area, the first row of micromirrors and the second row of micromirrors are exposed at the same time, and other rows of micromirrors are not light by default;
the controller receives a third trigger signal of the displacement sensor, the first row of micromirrors of the digital micromirror device is arranged at the blank of the digital film, the second row of micromirrors are overlapped on the last exposure area of the first row of micromirrors, the third row of micromirrors are overlapped on the last exposure area of the second row of micromirrors, the first row of micromirrors, the second row of micromirrors and the third row of micromirrors are simultaneously exposed, and other rows default no light;
and so on until all 3M rows of micromirrors of the whole digital micromirror device enter the exposure area, and then exit the exposure area;
and the digital micromirror device exits the exposure area, when the first row of micromirrors exceeds the exposure area, the first row of micromirrors defaults to be dark, other rows of micromirrors are exposed according to the gray-scale dot matrix image, and the like until all 3M rows of micromirrors of the digital micromirror device exceed the exposure area.
The digital film writing device provided by the embodiment of the invention is used for exposing gray-scale dot matrix images on a digital film, and comprises a film motion unit, a controller, a displacement sensor, a film tooth hole detection sensor, a laser and a light machine, wherein the displacement sensor, the film tooth hole detection sensor, the laser and the light machine are all connected with the controller. The digital film is driven to move at a uniform speed through the film moving unit; detecting the number of film tooth holes through a film tooth hole detection sensor, and providing a frame start signal for a controller; detecting the movement distance of the digital film by a displacement sensor, and providing a trigger signal to a controller according to the movement distance of the digital film; and the controller controls the laser and the optical machine to expose at a preset position of the digital film according to the trigger signal. The digital film writing device provided by the embodiment of the invention changes the working mode of the core optical machine, adopts the continuous uniform-speed running of the digital film, and adopts the optical machine to carry out the line scanning working mode, thereby realizing flexible definition of the image size and improvement of the writing speed and optimizing the color gradation stability of the exposure pixels.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a digital film writing device according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for writing digital films according to an embodiment of the present invention;
FIG. 3 is a flowchart of another digital film writing method according to an embodiment of the present invention;
FIG. 4 is a schematic view of an exposure principle according to an embodiment of the present invention;
FIG. 5 is a high density coded four tone gray scale map written by a digital film writing method according to an embodiment of the present invention;
fig. 6 is an enlarged schematic view of the area a in fig. 5.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a digital film writing device according to an embodiment of the present invention, where the digital film writing device is used for exposing a gray-scale dot matrix image on a digital film, and the gray-scale dot matrix image can be used for storing data, and referring to fig. 1, the digital film writing device includes a film motion unit 10, a controller 20, a displacement sensor 30, a film perforation detection sensor 40, a laser 50 and an optical machine 60, where the displacement sensor 30, the film perforation detection sensor 40, the laser 50 and the optical machine 60 are all connected to the controller 20; film motion unit 10 is used to move digital film 70 at a constant speed (shown in the direction of the arrow in fig. 1); the film perforation detection sensor 40 is used for detecting the perforation number of the film and providing a frame start signal to the controller 20; the displacement sensor 30 is used for detecting the movement distance of the digital film 70 and providing a trigger signal to the controller 20 according to the movement distance of the digital film 70; the controller 20 controls the exposure of the laser 50 and the light engine 60 at a predetermined position of the digital film 70 according to the trigger signal.
It can be understood that the digital film writing device provided in this embodiment adopts a line scanning mode to perform exposure, and compared with a whole frame writing mode, the line scanning writing mode can realize fixed height and unlimited width, and has greater flexibility. In the prior art, a small part of the laser line scanning mode is adopted, a laser device which moves at a constant speed during the stop motion of a film is adopted to realize the writing and the exposure of the digital film, the existing line scanning writing mode is limited, and the working principles of a mechanical device and a core optical machine of the digital film always have the problems of unstable exposure imaging pixel width and pixel color gradation change, so that the problem of the reduction of the decoding rate of a high-density image on the digital film is caused, the movement space of the laser device is limited, the imaging size specification is limited, and in addition, the movement speed of the laser device also limits the writing speed of the digital film.
In the embodiment, the function of accurately triggering and positioning the scanning and writing of the digital film row is realized. The machine detects the number of film perforations by using the film perforation sensor 40, and triggers a frame start signal written by the digital film every time; the displacement sensor 30 detects the movement distance of the film and generates a departure signal; the controller (MCU can be selected) controls the laser 50 and the optical machine 60 to synchronously operate according to the trigger signal, so as to realize film exposure.
Wherein, optionally, the controller 20 controls the laser 50 and the optical machine 60 to expose one line of pixels on the digital film 70 at a time, and writes the whole frame of gray-scale dot matrix image after multiple times of cyclic exposure.
According to the technical scheme, the digital film is driven to move at a uniform speed through the film moving unit; detecting the number of film tooth holes through a film tooth hole detection sensor, and providing a frame start signal for a controller; detecting the movement distance of the digital film by a displacement sensor, and providing a trigger signal to a controller according to the movement distance of the digital film; and the controller controls the laser and the optical machine to expose at a preset position of the digital film according to the trigger signal. The digital film writing device provided by the embodiment of the invention changes the working mode of the core optical machine, adopts the continuous uniform-speed running of the digital film, and adopts the optical machine to carry out the line scanning working mode, thereby realizing flexible definition of the image size and improvement of the writing speed and optimizing the color gradation stability of the exposure pixels.
Alternatively, based on the above embodiment, the displacement sensor 30 provides a trigger signal to the controller 20 each time the displacement sensor 30 detects the movement of the digital film 70 by a preset distance.
Optionally, the optical machine 60 includes a DMD, and when the digital film 70 is exposed, the light beam output by the laser 50 is incident on the DMD, reflected by the DMD, and then incident on the digital film for exposure.
Optionally, the controller 20 outputs a row signal and a pulse width modulation signal according to the trigger signal; the line signal is output to the optical machine 60 to realize line scanning control, the pulse width modulation signal is output to the laser 50 to control the light emission of the laser 50, and the exposure of the digital film 70 is realized in synchronization with the line signal.
Specifically, the working process of the digital film writing device provided in this embodiment is as follows: the digital film writing device is activated and the film moving unit 10 drives the digital film 70 at a speed V f At constant motion, the film perforation detection sensor 40 triggers a signal to the controller 20 indicating the start of a frame of image, at which time the controller 20 begins to detect the signal from the displacement sensor 30, whenever the displacement sensor 30 detects that the digital film 70 has moved a distance S x A trigger signal is generated to the controller 20, the controller 20 controls the DMD to turn over, and simultaneously generates a pulse signal for controlling the laser 50 to be turned on, and the duty ratio P of the pulse signal p The duration of the illumination is controlled such that exposure of a row of pixels on the digital film 70 is accomplished, and such that the cycle is repeated to complete writing of a frame of image.
Wherein the side length of each pixel is S r Then S x ＝S r +S r *P p The method comprises the steps of carrying out a first treatment on the surface of the If the pixel tone is C x Then S to the left of each pixel r *P p Within a distance, the tone scale is from 0 to C x Linearly increasing, S on the right r *P p Within the distance, the tone scale is from C x To 0 linearly decrements.
Optionally, the digital micromirror device includes a plurality of micromirrors arranged in an array, the micromirrors include a first state and a second state, when the micromirrors are in the first state, the light beam output by the laser is reflected to an exposure area of the digital film through the micromirrors, and when the micromirrors are in the second state, the light beam output by the laser is reflected to an area outside the exposure area of the digital film through the micromirrors.
The first state is that the micromirror is turned on, and the second state is that the micromirror is turned off.
Optionally, the digital micromirror device includes m×n columns of micromirrors, and the gray-scale dot matrix image includes n+1 gray scales; wherein M, N are integers greater than or equal to 2.
For example, when n=2, the gray-scale dot matrix image includes 3 gray scales, and when n=3, the gray-scale dot matrix image includes 4 gray scales, which may be designed according to practical situations, and the embodiment of the present invention is not limited thereto.
Based on the same inventive concept, fig. 2 is a schematic flow chart of a digital film writing method according to an embodiment of the present invention, where the digital film writing method is performed by using the digital film writing apparatus according to the above embodiment, and referring to fig. 2, the digital film writing method includes:
s1, controlling the digital film writing device to start.
Referring to fig. 1, the digital film writing device includes a film motion unit 10, a controller 20, a displacement sensor 30, a film perforation detection sensor 40, a laser 50 and an optical machine 60, wherein the displacement sensor 30, the film perforation detection sensor 40, the laser 50 and the optical machine 60 are all connected with the controller 20
S2, the film moving unit drives the digital film to move at a uniform speed.
S3, detecting the number of the film tooth holes by a film tooth hole detection sensor, triggering a frame start signal and transmitting the frame start signal to a controller.
And S4, detecting the movement distance of the digital film by a displacement sensor, and providing a trigger signal for the controller according to the movement distance of the digital film.
And S5, the controller controls the laser and the optical machine to expose at a preset position of the digital film according to the trigger signal.
According to the digital film writing method provided by the embodiment, the digital film is driven to move at a constant speed through the film moving unit; detecting the number of film tooth holes through a film tooth hole detection sensor, and providing a frame start signal for a controller; detecting the movement distance of the digital film by a displacement sensor, and providing a trigger signal to a controller according to the movement distance of the digital film; the controller controls the laser and the optical machine to expose at the preset position of the digital film according to the trigger signal, thus changing the working mode of the core optical machine, adopting the continuous uniform running of the digital film and the optical machine to carry out the line scanning working mode, realizing the flexible definition of the image size and the improvement of the writing speed, and optimizing the color gradation stability of the exposure pixels.
Fig. 3 is a flowchart of still another digital film writing method according to an embodiment of the present invention, referring to fig. 3, optionally, the controller controls the laser and the optical machine to expose a row of pixels on the digital film each time, and after S5, the method further includes:
s6, circularly executing S2-S5 until the whole frame of gray-scale dot matrix image is written on the digital film.
Fig. 4 is a schematic view of an exposure principle provided by an embodiment of the present invention, referring to fig. 4, optionally, the optical engine includes a digital micromirror device, the digital micromirror device includes m×3 columns of micromirrors, the gray-scale dot matrix image includes 4 gray scales, and the exposure process of the 4 gray-scale image includes:
the controller receives a first trigger signal of the displacement sensor, a first row of micromirrors of the digital micromirror device exposes at the blank of the digital film, and other rows of micromirrors default to be dark;
the controller receives a second trigger signal of the displacement sensor, the first row of micromirrors of the digital micromirror device is arranged at the blank of the digital film, the second row of micromirrors is overlapped in the first exposure area, the first row of micromirrors and the second row of micromirrors are exposed at the same time, and other rows of micromirrors are not light by default;
the controller receives a third trigger signal of the displacement sensor, the first row of micromirrors of the digital micromirror device is arranged at the blank of the digital film, the second row of micromirrors is overlapped at the last exposure area of the first row of micromirrors, the third row of micromirrors is overlapped at the last exposure area of the second row of micromirrors, the first row of micromirrors, the second row of micromirrors and the third row of micromirrors are simultaneously exposed, and other rows of micromirrors are default to be free of light;
and so on until all 3M rows of micromirrors of the whole digital micromirror device enter the exposure area, and then exit the exposure area;
the digital micromirror device exits the exposure area, when the first row of micromirrors exceeds the exposure area, default is no light, other rows are exposed according to the gray-scale dot matrix image, and so on until all 3M rows of micromirrors of the digital micromirror device exceed the exposure area.
Therefore, each column of the film is exposed by 3N times of DMDs, and each time of exposure, the DMDs have two states of being switched on and off, so that each pixel point on the film can form exposure times of 0 times, N times, 2N times and 3N times by controlling the switch state, and 4 color levels are formed in a superposition mode.
Exemplary, fig. 5 is a high-density coded four-tone gray scale map written by the digital film writing method according to the embodiment of the present invention, and fig. 6 is an enlarged schematic diagram of an area a in fig. 5.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The digital film writing device is characterized by comprising a film motion unit, a controller, a displacement sensor, a film tooth hole detection sensor, a laser and a light machine, wherein the displacement sensor, the film tooth hole detection sensor, the laser and the light machine are all connected with the controller;
the film motion unit is used for driving the digital film to move at a uniform speed;
the film perforation detection sensor is used for detecting the perforation number of the film and providing a frame start signal for the controller;
the displacement sensor is used for detecting the movement distance of the digital film and providing a trigger signal for the controller according to the movement distance of the digital film;
and the controller controls the laser and the optical machine to expose at a preset position of the digital film according to the trigger signal.
2. The digital film writing apparatus of claim 1, wherein said displacement sensor provides said trigger signal to said controller once every time said displacement sensor detects said digital film movement by a preset distance.
3. The digital film writing apparatus of claim 1, wherein the optical machine includes a digital micromirror device, and wherein the light beam output from the laser is incident on the digital micromirror device when the digital film is exposed, and is reflected by the digital micromirror device and then incident on the digital film for exposure.
4. The digital film writing apparatus of claim 3, wherein said digital micromirror device comprises a plurality of micromirrors arranged in an array, said micromirrors comprising a first state and a second state, wherein when said micromirrors are in said first state, the light beam output by said laser is reflected by said micromirrors to an exposed area of said digital film, and when said micromirrors are in said second state, the light beam output by said laser is reflected by said micromirrors to an area other than the exposed area of said digital film.
5. The digital film writing apparatus of claim 1, wherein said digital micromirror device comprises M x N columns of micromirrors, said gray scale dot matrix image comprises n+1 gray scale;
wherein M, N are integers greater than or equal to 2.
6. The digital film writing apparatus of claim 1, wherein said controller outputs a line signal and a pulse width modulation signal in accordance with said trigger signal;
the line signal is output to the optical machine to realize the line scanning control, the pulse width modulation signal is output to the laser to control the light emission of the laser, and the exposure of the digital film is realized in synchronization with the line signal.
7. The digital film writing apparatus of claim 1, wherein said controller controls said laser and said light engine to expose a line of pixels on said digital film at a time, and writes a full frame gray scale dot matrix image after a plurality of cyclical exposures.
8. A digital film writing method, characterized by being performed by the digital film writing apparatus according to any one of claims 1 to 7, comprising:
s1, controlling the digital film writing device to start;
s2, the film motion unit drives the digital film to move at a uniform speed;
s3, detecting the number of film tooth holes by a film tooth hole detection sensor, triggering a frame start signal and transmitting the frame start signal to a controller;
s4, detecting the movement distance of the digital film by a displacement sensor, and providing a trigger signal to the controller according to the movement distance of the digital film;
and S5, the controller controls the laser and the optical machine to expose at the preset position of the digital film according to the trigger signal.
9. The digital film writing method of claim 8, wherein said controller controls said laser and said light engine to expose a line of pixels on said digital film at a time, further comprising, after S5:
s6, executing S2-S5 circularly until the whole frame of gray-scale dot matrix image is written on the digital film.
10. The digital film writing method of claim 8, wherein the optical engine comprises a digital micromirror device comprising M x 3 columns of micromirrors, the gray-scale dot matrix image comprises 4 gray-scales, and the exposing of the 4 gray-scale map comprises:
the controller receives a first trigger signal of the displacement sensor, a first row of micromirrors of the digital micromirror device exposes at the blank of the digital film, and other rows of micromirrors default to be dark;
the controller receives a second trigger signal of the displacement sensor, a first row of micromirrors of the digital micromirror device is arranged at a blank position of the digital film, a second row of micromirrors is overlapped in a first exposure area, the first row of micromirrors and the second row of micromirrors are exposed at the same time, and other rows of micromirrors are not light by default;
the controller receives a third trigger signal of the displacement sensor, the first row of micromirrors of the digital micromirror device is arranged at the blank of the digital film, the second row of micromirrors are overlapped on the last exposure area of the first row of micromirrors, the third row of micromirrors are overlapped on the last exposure area of the second row of micromirrors, the first row of micromirrors, the second row of micromirrors and the third row of micromirrors are simultaneously exposed, and other rows default no light;
and so on until all 3M rows of micromirrors of the whole digital micromirror device enter the exposure area, and then exit the exposure area;
and the digital micromirror device exits the exposure area, when the first row of micromirrors exceeds the exposure area, the first row of micromirrors defaults to be dark, other rows of micromirrors are exposed according to the gray-scale dot matrix image, and the like until all 3M rows of micromirrors of the digital micromirror device exceed the exposure area.
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