CN101360169A - Image forming accuracy control system and control method thereof - Google Patents
Image forming accuracy control system and control method thereof Download PDFInfo
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- CN101360169A CN101360169A CNA2007101371545A CN200710137154A CN101360169A CN 101360169 A CN101360169 A CN 101360169A CN A2007101371545 A CNA2007101371545 A CN A2007101371545A CN 200710137154 A CN200710137154 A CN 200710137154A CN 101360169 A CN101360169 A CN 101360169A
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Abstract
The invention discloses an imaging precision control system as well as a control method thereof, and the system is provided with a sensing module for extracting images of an object to be imaged, the sensing module extracts benchmark images of the object to be imaged before moving and updated images after moving, the images are converted into digital signals through an analog/digital converter and then the signals are transmitted to a processing unit, the processing unit compares the digital signals of the updated images and the benchmark images and then produces a reference displacement value, after the processing unit compares the reference displacement value with a difference value between benchmark displacement values stored in a memory cell, a PWM circuit is controlled according to the difference value, so the PWM circuit can adjust the frequency of the output pulse signals. Therefore, the imaging precision control system controls the rotating speed of a paper feed roller and the scanning speed of a scanning module in an imaging apparatus through the output pulse signals of the PWM circuit, so as to further control the imaging speed of the imaging apparatus.
Description
Technical field
The present invention relates to a kind of image forming accuracy control system, relate in particular to the image forming accuracy control system and the control method thereof of the sweep speed of a kind of rotating speed of the paper feed roller of controlling imaging device and scan module.
Background technology
Along with the fast development of electronic technology, personal computer has become indispensable product in daily life and the operational environment, the user by personal computer can handle the document data, watch image, listoning music be connected internet etc.In addition, more can realize multiple function after personal computer product mix peripheral with it uses.For example, the user by personal computer and printer collocation printable data and image, can with file and image change into e-file by personal computer and scanner collocation by personal computer and considerable the seeing a film of projector's collocation.
In above-mentioned product, computer-related products of choosing for user's override with the scanner especially.Generally speaking, when heap file is changed into e-file, then need to expend the many time as if word for word importing by personal computers such as keyboard and mouse periphery product, but user only need can change into a large amount of files e-file by scanner and be stored in the personal computer, therefore, the user can save the typewriting time.And scanner now all has the function of chromoscan, can not only the scanning black-white file, but also scanning colour file and picture etc.
Scanner now can be divided into palm formula scanner, falt bed scanner, paper feeding scanner, film scanner, large scale scanner, photographing scanning instrument and drum type scanner etc.In above-mentioned scanner kind, what the user used always is falt bed scanner and paper feeding scanner.During usage platform formula scanner, need to treat that the imaging thing places on the scanning platform, when scanning, CD-ROM drive motor and driving belt drive powerful fluorescent tube, with strong illumination to treating on the imaging thing, can pass on the photosensory assembly after the light reflection, ccd sensor for example, afterwards, the electric current that the power that the photosensory assembly light beams that difference is strong and weak transfers to differs also reaches analog/digital converter, analog/digital converter changes into digital signal with the analog signal of electric current again, and this digital signal can be shown on the screen and be stored in the personal computer.
But when scanning document, falt bed scanner once can only scan a file.When many files are to be scanned, need file is replaced one by one and placed on the scanning platform, so the user need expend many times in the replacement and ornaments of file.For improving the shortcoming of above-mentioned falt bed scanner, so the generation of paper feeding scanner is arranged.Paper feeding scanner drives roller with motor, utilizes roller one by one in the feed-in scanner, to make file to be scanned pass through ccd sensor in regular turn file to be scanned.Therefore, the user can save alternate file and the time of placing file.
But, the roller of paper feeding scanner must drive file to be scanned with certain speed, make file to be scanned pass through ccd sensor in regular turn, when the roller loss, its speed that drives file to be scanned is also slack-off along with consumption, file to be scanned also can be slack-off by the speed of ccd sensor, thereby influence scan magnification, and then cause the poor image quality for the treatment of the imaging thing.
So image forming accuracy control system how to design the sweep speed of a kind of rotating speed of paper feed roller of gated sweep instrument and scan module is the scanner manufacturer problem that must face now.
Summary of the invention
One of purpose of the present invention is to provide a kind of image forming accuracy control system, the rotating speed of the paper feed roller of may command imaging device or the sweep speed of scan module.
For achieving the above object, image forming accuracy control system provided by the present invention has sensing module, analog/digital converter, memory cell, processing unit and pwm circuit.Sensing module comprises luminous element and photoinduction body, luminous element provides projecting beam and light beam is projected to and treats on the imaging thing, the photoinduction body receives treats that imaging thing beam reflected treats the image of imaging thing and image is reached analog/digital converter with extraction, analog/digital converter receives from the image of photoinduction body and this image is changed into digital signal by analog signal, cell stores one benchmark image and a basis displacement value, processing unit receives the digital signal of analog/digital converter output, processing unit relatively produces a reference displacement values behind this digital signal and the benchmark image, processing unit is according to the difference control pwm circuit of this reference displacement values and basis displacement value, make the frequency of the pulse signal that the pwm circuit adjustment is produced also this pulse signal be delivered to stepper motor and scan module, with the rotating speed of control paper feed roller and the sweep speed of scan module.
Described imaging device has housing, has the one scan path in the housing, be sequentially provided with pickup roller, comber, paper feed roller, stepper motor, scan module and move back paper roller on scanning pattern, described luminous element and photoinduction body all are arranged on the scanning pattern and are arranged between paper feed roller and the scan module.
Described pwm circuit connects the stepper motor of imaging device and the velocity of rotation of control step motor, makes stepper motor control paper feed roller drive the imaging thing speed for the treatment of.
Described pwm circuit connects described scan module and controls the sweep speed of this scan module.
Another object of the present invention is to provide a kind of imaging precision control method, the rotating speed of the paper feed roller of may command imaging device or the sweep speed of scan module.
For achieving the above object, imaging precision control method provided by the present invention may further comprise the steps: step 1: set the basis displacement value and the basis displacement value is stored in the memory cell; Step 2: utilize sensing module to extract the analog image for the treatment of the imaging thing, this analog image is stored in the memory cell after changing into benchmark image by analog/digital converter; Step 3: utilize sensing module to extract the analog image for the treatment of the imaging thing once more, this analog image is delivered to processing unit after changing into update image by analog/digital converter; Step 4: relatively produce a reference displacement values behind update image and the benchmark image that is stored in memory cell; Step 5: utilize processing unit to judge whether reference displacement values equals to be stored in the basis displacement value of memory cell, when reference displacement values equals the basis displacement value, execution in step seven, when reference displacement values is not equal to the basis displacement value, execution in step six; Step 6: processing unit is adjusted the output pulse signal of pwm circuit according to the difference of reference displacement values and basis displacement value; And step 7: replace benchmark image and be stored in the memory cell with update image, execution in step three afterwards.
Establish the one scan path at described imaging device, pickup roller, comber, paper feed roller, stepper motor, scan module are set on scanning pattern in regular turn and move back paper roller, luminous element and photoinduction body are being set on the scanning pattern and between paper feed roller and scan module.
Described pwm circuit is connected the velocity of rotation of the stepper motor of imaging device with the control step motor, make stepper motor control paper feed roller drive the speed for the treatment of the imaging thing.
Described pwm circuit is connected the sweep speed of scan module with the gated sweep module.
Therefore, image forming accuracy control system of the present invention extracts benchmark image and the update image for the treatment of the imaging thing by sensing module, afterwards, the difference of processing unit benchmark image and update image, and according to this difference control pwm circuit, make the frequency of the pulse signal that the pwm circuit adjustment is exported also this pulse signal be delivered to paper feed roller and scan module, with the rotating speed of control paper feed roller and the sweep speed of scan module.
Description of drawings
The schematic diagram that Fig. 1 is connected with scanner for image forming accuracy control system of the present invention.
Fig. 2 is the circuit block diagram of image forming accuracy control system first embodiment of the present invention.
Fig. 3 is the flow chart of imaging precision control method of the present invention.
When Fig. 4 A, Fig. 4 B and Fig. 4 C rotated for paper feed roller constant speed in the image forming accuracy control system of the present invention, sensing module is the schematic diagram from the image correlation for the treatment of to extract on the imaging thing in the different periods.
When Fig. 5 rotates for paper feed roller constant speed in the image forming accuracy control system of the present invention, the triggering signal schematic diagram of the output pulse signal of pwm circuit and sensing module.
Fig. 6 A, Fig. 6 B and Fig. 6 C are that the paper feed roller is not when constant speed is rotated in the image forming accuracy control system of the present invention, and sensing module is the schematic diagram from the image correlation for the treatment of to extract on the imaging thing in the different periods.
Fig. 7 for paper feed roller in the image forming accuracy control system of the present invention when constant speed is not rotated, the triggering signal schematic diagram of the output pulse signal of pwm circuit and sensing module.
Fig. 8 is the circuit block diagram of image forming accuracy control system second embodiment of the present invention.
When Fig. 9 rotates for paper feed roller constant speed in the image forming accuracy control system of the present invention, the output pulse signal of pwm circuit and the triggering signal of sensing module.
Figure 10 for the present invention when paper feed roller in imaging accuracy control system when constant speed is rotated, the output pulse signal of pwm circuit and the triggering signal of sensing module.
Wherein, description of reference numerals is as follows:
100 image forming accuracy control systems, 1 sensing module
10 luminous elements, 11 photoinduction bodies
2 amplifiers, 3 analog/digital converters
4 processing units, 5 memory cell
6 pwm circuits, 90 housings
91 pickup rollers, 92 combers
93 paper feed rollers, 94 stepper motors
95 scan modules 96 move back paper roller
97 treat the imaging thing
Embodiment
By describing technology contents of the present invention, structural feature in detail, realized purpose and effect, below describe in detail especially exemplified by embodiment and conjunction with figs..
See also Fig. 1, image forming accuracy control system 100 of the present invention can apply in the electronic products such as scanner and photocopier, in the present embodiment, is the example explanation with the scanner.Scanner has housing 90, and definition has the one scan path in housing 90, is sequentially provided with pickup roller 91, comber 92, paper feed roller 93, stepper motor 94, scan module 95 and moves back paper roller 96 on scanning pattern.Treat imaging thing 97, tablets such as paper, photo or card for example, at first brought in the scanning pattern through pickup roller 91, afterwards, pass through comber 92 and paper feed roller 93 in regular turn, drive paper feed roller 93, make and treat that imaging thing 97 is brought to scan module 95 by stepper motor 94, after scan module 95 has scanned and treated imaging thing 97, move back paper roller 96 drives and treat imaging thing 97 and will treat that imaging thing 97 bands are from scanning pattern.
Please consult Fig. 2 simultaneously, Fig. 2 is the circuit block diagram of image forming accuracy control system 100 first embodiment of the present invention.Image forming accuracy control system 100 of the present invention has sensing module 1, amplifier 2, analog/digital converter 3, processing unit 4, memory cell 5 and pwm circuit 6.Originally execute in the example, sensing module 1 is arranged on the scanning pattern of scanner and is arranged between paper feed roller 93 and the scan module 95, and sensing module 1 has luminous element 10 and photoinduction body 11, in the present embodiment, luminous element 10 is a light-emitting diode, and photoinduction body 11 can be ccd sensor.
When treating imaging thing 97 by sensing module 1, luminous element 10 provides projecting beam and light beam is projected to treats on the imaging thing 97 that afterwards, photoinduction body 11 extracts the image for the treatment of imaging thing 97.Amplifier 2 connects sensing module 1 and analog/digital converter 3 respectively, amplifier 2 receives the image from photoinduction body 11 extractions of sensing module 1, and will reach analog/digital converter 3 after this image amplification, afterwards, analog/digital converter 3 changes into digital signal with the analog image that receives.Processing unit 4 connects analog/digital converter 3, memory cell 5 and pwm circuit 6 respectively.
See also Fig. 2 and Fig. 3, the step of imaging precision control method of the present invention is as described below.
Step S01: set the basis displacement value and the basis displacement value is stored in the memory cell 5;
Step S02: utilize sensing module 1 to extract the analog image for the treatment of imaging thing 97, this analog image is stored in the memory cell 5 by processing unit 4 after changing into benchmark image by analog/digital converter 3;
Step S03: utilize sensing module 1 to extract the analog image for the treatment of imaging thing 97 once more, this analog image reaches processing unit 4 after changing into update image by analog/digital converter 3;
Step S04: processing unit 4 relatively produces a reference displacement values behind update image and the benchmark image that is stored in memory cell 5;
Step S05: processing unit 4 judges whether reference displacement values equals to be stored in the basis displacement value of memory cell 5, and when reference displacement values equals the basis displacement value, execution in step S07 is when reference displacement values is not equal to basis displacement value, execution in step S06;
Step S06: processing unit 4 is adjusted the output pulse signal of pwm circuit 6 according to the difference of reference displacement values and basis displacement value; And
Step S07: replace benchmark image and be stored in the memory cell 5 with update image, afterwards execution in step S03.
In first embodiment of the invention, pwm circuit 6 connects stepper motor 94, and stepper motor 94 connects paper feed roller 93.Pwm circuit 6 is delivered to the also velocity of rotation of control step motor 94 of stepper motor 94 with this pulse signal, make stepper motor 94 drive paper feed rollers 93, and 93 drives of paper feed roller treats that imaging thing 97 moves towards moving back paper roller 96.
See also Fig. 4 A to Fig. 4 C and Fig. 5, when Fig. 4 A to Fig. 4 C is the rotation of paper feed roller 93 constant speed, sensing module 1 is the schematic diagram from the image correlation for the treatment of to extract on the imaging thing 97 in the different periods, when Fig. 5 is the rotation of paper feed roller 93 constant speed, the triggering signal of the output pulse signal of pwm circuit 6 and sensing module 1.In an embodiment, per 3 microseconds of triggering signal produce a trigger impulse, and each trigger impulse all triggers sensing module 1, make sensing module 1 extract the image of once treating on the imaging thing 97.
When 100 actions of imaging accuracy control system, the preset reference shift value is 0.6 micron of every microsecond, the basis displacement value is stored in the memory cell 5, and pwm circuit 6 can send the pulse signal of a predeterminated frequency according to the basis displacement value, this pulse signal may command stepper motor 94 drives paper feed roller 93, make paper feed roller 93 drive and treat that imaging thing 97 moves towards sensing module 1, in the present embodiment, each pulse signal can drive paper feed roller 93 and move 0.6 micron.(label a) among Fig. 5 when triggering signal produces first trigger impulse, sensing module 1 extracts the image of once treating on the imaging thing 97 (shown in Fig. 4 A), afterwards, this image that extracts for the first time is as benchmark image, when triggering signal produces second trigger impulse (label b among Fig. 5), sensing module 1 extracts the image for the treatment of on the imaging thing 97 (shown in Fig. 4 B) once more, and afterwards, this image that extracts for the second time is as update image.
Continue to send pulse signal by pwm circuit 6, make paper feed roller 93 continue to drive and treat that imaging thing 97 moves, therefore, by calculating the difference of update image and benchmark image, processing unit 4 can be calculated a reference displacement values.In the present embodiment, image is made up of the grid of 8x8, and each grid is all represented 0.6 micron gap.Therefore, update image (shown in Fig. 4 B) is 1.8 microns with the reference displacement values of benchmark image (shown in Fig. 4 A).
Treat once that by calculating sensing module 1 per 3 microseconds extraction the image of imaging thing 97 and the reference displacement values of front and back time image are 1.8 microns, therefore, the real rotary speed of paper feed roller 93 is 0.6 micron of every microsecond, and it equates with the basis displacement value.Therefore, pwm circuit 6 continues to produce the pulse signal of predeterminated frequency, makes that paper feed roller 93 continues to treat that according to present speed drive imaging thing 97 moves.And treat that imaging thing 97 also passes through scan module 95 according to pre-set velocity.Afterwards, update image replaces benchmark image and is stored in the memory cell 5.According to above-mentioned explanation, when sensing module 1 extract once more treat imaging thing 97 images after (shown in Fig. 4 C), pwm circuit 6 and processing unit 4 are also according to above-mentioned explanation action.
See also Fig. 6 A to Fig. 6 C and Fig. 7, Fig. 6 A to Fig. 6 C is that paper feed roller 93 is not when constant speed is rotated, sensing module 1 is the schematic diagram from the image correlation for the treatment of to extract on the imaging thing 97 in the different periods, Fig. 7 is a paper feed roller 93 when constant speed is not rotated, the triggering signal of the output pulse signal of pwm circuit 6 and sensing module 1.(label a) among Fig. 7 when triggering signal produces first trigger impulse, sensing module 1 extracts the image of once treating on the imaging thing 97 (as shown in Figure 6A), afterwards, this image that extracts for the first time is as benchmark image, when triggering signal produces second trigger impulse (label b among Fig. 7), sensing module 1 extracts the image for the treatment of on the imaging thing 97 (shown in Fig. 6 B) once more, and afterwards, this image that extracts for the second time is as update image.
Continue to send pulse signal by pwm circuit 6, make paper feed roller 93 continue to drive and treat that imaging thing 97 moves, therefore, by calculating the difference of update image and benchmark image, processing unit 4 can be calculated a reference displacement values.In the present embodiment, update image (shown in Fig. 6 B) is 1.2 microns with the reference displacement values of benchmark image (as shown in Figure 6A).
Treat once that by calculating sensing module 1 per 3 microseconds extraction the image of imaging thing 97 and the reference displacement values of front and back time image are 1.2 microns, therefore, the real drive speed of paper feed roller 93 is 0.4 micron of every microsecond, itself and basis displacement value is unequal, and itself and the speed of 0.6 micron minimizing 1/3rd of the every microsecond of preset reference shift value.Therefore, processing unit 4 control pwm circuits 6 are adjusted output pulse signal.In the present embodiment, processing unit 4 control pwm circuits 6 make it export 4 subpulse signals in 3 microseconds, make the speed of paper feed roller 93 liftings 1/3rd supply the speed of original deficiency.Afterwards, update image replaces benchmark image and is stored in the memory cell 5.
According to above-mentioned explanation, when sensing module 1 extract once more treat imaging thing 97 images after (shown in Fig. 6 C), pwm circuit 6 and processing unit 4 are also according to above-mentioned explanation action.In the present embodiment, update image (shown in Fig. 6 C) is 1.8 microns with the reference displacement values of benchmark image (shown in Fig. 6 B).
Treat once that by calculating sensing module 1 per 3 microseconds extraction the image of imaging thing 97 and the reference displacement values of front and back time image are 1.8 microns, therefore, the real drive speed of paper feed roller 93 is 0.6 micron of every microsecond, and it equates with the basis displacement value.Therefore, pwm circuit 6 continues to produce pulse signal with the frequency of upgrading, and makes paper feed roller 93 lasting drives according to the speed of upgrading treat that imaging thing 97 moves.And treat that imaging thing 97 also passes through scan module 95 according to the speed of upgrading.
As mentioned above, image forming accuracy control system 100 of the present invention is controlled paper feed roller 93 by the frequency of adjusting pwm circuit 6 output pulse signals and is driven the speed for the treatment of imaging thing 97, make and treat that imaging thing 97 passes through scan module 95 according to required speed, further the imaging precision of gated sweep module 95.
See also Fig. 8, Fig. 8 is the circuit block diagram of second embodiment of image forming accuracy control system 100 of the present invention.In the present embodiment, pwm circuit 6 connects scan module 95, and this pulse signal is delivered to scan module 95 to pwm circuit 6 and gated sweep module 95 scans the frequency for the treatment of imaging thing 97.
See also Fig. 4 A to Fig. 4 C and Fig. 9, when Fig. 9 is the rotation of paper feed roller 93 constant speed, the triggering signal of the output pulse signal of pwm circuit 6 and sensing module 1.When 100 actions of imaging accuracy control system, the preset reference shift value is 0.6 micron of every microsecond, the basis displacement value is stored in the memory cell 5, and pwm circuit 6 can send the pulse signal of a predeterminated frequency according to the basis displacement value, but this pulse signal driver sweep module 95 makes scan module 95 scannings treat imaging thing 97.In the present embodiment, default pwm circuit 6 per 1 microseconds produce a pulse signal and driver sweep module 95, make scan module 95 per 1 microsecond scannings treat imaging thing 97 once.
In the present embodiment, per 3 microseconds of triggering signal produce pulsatile once to trigger sensing module 1, make sensing module 1 per 3 microseconds extract the image of once treating on the imaging thing 97.(label a) among Fig. 9 when triggering signal produces first pulse, sensing module 1 extracts the image of once treating on the imaging thing 97 (shown in Fig. 4 A), afterwards, this image that extracts for the first time is as benchmark image, when triggering signal produces second pulse (label b among Fig. 9), sensing module 1 extracts the image for the treatment of on the imaging thing 97 (shown in Fig. 4 B) once more, and afterwards, this image that extracts for the second time is as update image.
By calculating the difference of update image and benchmark image, processing unit 4 can be calculated a reference displacement values.In the present embodiment, image is made up of the grid of 8x8, and each grid is all represented 0.6 micron gap.Therefore, update image (shown in Fig. 4 B) is 1.8 microns with the reference displacement values of benchmark image (shown in Fig. 4 A).Treat once that by calculating sensing module 1 per 3 microseconds extraction the image of imaging thing 97 and the reference displacement values of front and back time image are 1.8 microns, therefore, the real drive speed of paper feed roller 93 is 0.6 micron of every microsecond, and it equates with the basis displacement value.
Therefore, pwm circuit 6 continues to produce a pulse signal and driver sweep module 95 with per 1 microsecond, makes that scan module 95 continues to treat imaging thing 97 once with per 1 microsecond scanning.Afterwards, update image replaces benchmark image and is stored in the memory cell 5.According to above-mentioned explanation, when sensing module 1 extract once more treat imaging thing 97 images after (shown in Fig. 4 C), pwm circuit 6 and processing unit 4 are also according to above-mentioned explanation action.
See also Fig. 6 B to Fig. 6 C and Figure 10, Figure 10 is a paper feed roller 93 when constant speed is rotated, the triggering signal of the output pulse signal of pwm circuit 6 and sensing module 1.(label a) among Figure 10 when triggering signal produces first trigger impulse, sensing module 1 extracts the image of once treating on the imaging thing 97 (as shown in Figure 6A), afterwards, this image that extracts for the first time is as benchmark image, when triggering signal produces second trigger impulse (label b among Figure 10), sensing module 1 extracts the image for the treatment of on the imaging thing 97 (shown in Fig. 6 B) once more, and afterwards, this image that extracts for the second time is as update image.
By calculating the difference of update image and benchmark image, processing unit 4 can be calculated a reference displacement values.In the present embodiment, update image (shown in Fig. 6 B) is 1.2 microns with the reference displacement values of benchmark image (as shown in Figure 6A).Treat once that by calculating sensing module 1 per 3 microseconds extraction the image of imaging thing 97 and the reference displacement values of front and back time image are 1.2 microns, therefore, the real drive speed of paper feed roller 93 is 0.4 micron of every microsecond, it is mutually unequal with the basis displacement value, and itself and the every microsecond of preset reference shift value reduce by 1/3rd speed for 0.6 micron.
Therefore, processing unit 4 control pwm circuits 6 are adjusted output pulse signal.In the present embodiment, processing unit 4 control pwm circuits 6 make pwm circuit 6 per 1.33 microseconds export 1 subpulse signal, and the sweep speed that makes scan module 95 minimizings 1/3rd is to supply the speed of original deficiency.Afterwards, update image replaces benchmark image and is stored in the memory cell 5.As mentioned above, image forming accuracy control system 100 of the present invention scans the speed for the treatment of imaging thing 97 by the frequency of adjusting pwm circuit 6 output pulse signals with gated sweep module 95, further the imaging precision of gated sweep module 95.
According to above-mentioned explanation, when sensing module 1 extract once more treat imaging thing 97 images after (shown in Fig. 8 C), pwm circuit 6 and processing unit 4 are also according to above-mentioned explanation action.In the present embodiment, update image (shown in Fig. 8 C) is 1.8 microns with the reference displacement values of benchmark image (shown in Fig. 6 B).Treat once that by calculating sensing module 1 per 3 microseconds extraction the image of imaging thing 97 and the reference displacement values of front and back time image are 1.8 microns, therefore, the real drive speed of paper feed roller 93 is 0.6 micron of every microsecond, and it equates with the basis displacement value.Therefore, pwm circuit 6 continues to produce pulse signal with the frequency of upgrading, and makes scan module 95 continue to treat imaging thing 97 according to the velocity scanning of upgrading.
Through above-mentioned explanation as can be known, after image forming accuracy control system 100 of the present invention is treated the image of imaging thing 97 by sensing module 1 extraction, analog/digital converter 3 changes into benchmark image with this image and is stored in the memory cell 5, after sensing module 1 extracts once more and treats the image of imaging thing 97, analog/digital converter 3 changes into update image with this image, afterwards, processing unit 4 calculates the difference of benchmark image and update image and calculates reference displacement values, after processing unit 4 calculates the difference of reference displacement values and the basis displacement value that is stored in memory cell 5, according to this difference control pwm circuit 6, make pwm circuit 6 adjust the pulse signal of output.
This pulse signal may be output to stepper motor 94, and further the velocity of rotation of control step motor 94 makes stepper motor 94 control paper feed rollers 93 drive the speed for the treatment of imaging thing 97.In addition, this pulse signal also may be output to scan module 95, further the sweep speed of gated sweep module 95.Therefore, the sweep speed of image forming accuracy control system 100 may command paper feed roller 93 velocities of rotation of the present invention and scan module 95, the further imaging precision of gated sweep module 95.
Claims (8)
1. image forming accuracy control system is used to control the image taking speed of an imaging device, it is characterized in that, comprising:
One luminous element provides projecting beam and light beam is projected to one and treats on the imaging thing;
One photoinduction body receives and to treat that imaging thing beam reflected treats the image of imaging thing with extraction;
One analog/digital converter connects the photoinduction body, also this image is changed into digital signal in order to the image that receives from described photoinduction body;
One memory cell is in order to store a benchmark image and a basis displacement value;
One processing unit, connect described analog/digital converter and memory cell, this processing unit receives the digital signal of described analog/digital converter output and relatively behind this digital signal and the benchmark image, this processing unit produces a reference displacement values, and this processing unit calculates the difference between this reference displacement values and the basis displacement value; And
One pwm circuit connects described processing unit and imaging device, and this pwm circuit calculates the frequency of the pulse signal that gained reference displacement values and difference adjustment between the basis displacement value produced to control the image taking speed of imaging device according to described processing unit.
2. image forming accuracy control system as claimed in claim 1, it is characterized in that: described imaging device has housing, has the one scan path in the housing, be sequentially provided with pickup roller, comber, paper feed roller, stepper motor, scan module and move back paper roller on scanning pattern, described luminous element and photoinduction body all are arranged on the scanning pattern and are arranged between paper feed roller and the scan module.
3. image forming accuracy control system as claimed in claim 2 is characterized in that: described pwm circuit connects the stepper motor of imaging device and the velocity of rotation of control step motor, makes stepper motor control paper feed roller drive the imaging thing speed for the treatment of.
4. image forming accuracy control system as claimed in claim 2 is characterized in that: described pwm circuit connects described scan module and controls the sweep speed of this scan module.
5. imaging precision control method is used to control the image taking speed of an imaging device, it is characterized in that, comprises the steps:
At first, set basis displacement value and the basis displacement value is stored in the memory cell;
Secondly, utilize a sensing module to extract the analog image for the treatment of the imaging thing, this analog image is stored in the memory cell after changing into benchmark image by an analog/digital converter;
Then, sensing module extracts the analog image for the treatment of the imaging thing once more, and this analog image reaches processing unit after changing into update image by analog/digital converter;
Then, processing unit produces a reference displacement values after comparing update image and benchmark image;
Then, processing unit judges whether reference displacement values equals to be stored in the basis displacement value of memory cell, when reference displacement values equals the basis displacement value, update image replaces benchmark image and is stored in the memory cell, when reference displacement values is not equal to the basis displacement value, processing unit is adjusted the frequency of the output pulse signal of a pwm circuit according to the difference of reference displacement values and basis displacement value, with the image taking speed of control imaging device; And
At last, sensing module extracts the analog image for the treatment of the imaging thing once more.
6. imaging precision control method as claimed in claim 5, it is characterized in that: establish the one scan path at described imaging device, pickup roller, comber, paper feed roller, stepper motor, scan module are set on scanning pattern in regular turn and move back paper roller, luminous element and photoinduction body are being set on the scanning pattern and between paper feed roller and scan module.
7. imaging precision control method as claimed in claim 6 is characterized in that: described pwm circuit is connected the velocity of rotation of the stepper motor of imaging device with the control step motor, make stepper motor control paper feed roller drive the speed for the treatment of the imaging thing.
8. imaging precision control method as claimed in claim 6 is characterized in that: described pwm circuit is connected the sweep speed of scan module with the gated sweep module.
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| CNA2007101371545A CN101360169A (en) | 2007-07-30 | 2007-07-30 | Image forming accuracy control system and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102117128B (en) * | 2009-12-31 | 2013-03-27 | 敦南科技股份有限公司 | High resolution image sensing device and image sensing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102117128B (en) * | 2009-12-31 | 2013-03-27 | 敦南科技股份有限公司 | High resolution image sensing device and image sensing method thereof |
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