CN1700724A - Scanner and exposure control method thereof - Google Patents
Scanner and exposure control method thereof Download PDFInfo
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- CN1700724A CN1700724A CN 200410018559 CN200410018559A CN1700724A CN 1700724 A CN1700724 A CN 1700724A CN 200410018559 CN200410018559 CN 200410018559 CN 200410018559 A CN200410018559 A CN 200410018559A CN 1700724 A CN1700724 A CN 1700724A
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Abstract
This invention relates to scanner, which comprises scanning platform, optical module, power driver and exposure control unit, wherein, the platform is to support the scanning files to be supported; the optical module comprises sensitive components to sense the N scanning lines of the files; power source is to drive the optical module with coder to output relative optical module position signals; the exposure control unit comprises timer to control light sense components to sense each scanning line exposure time as fixed; the power source driving optical module is to graduate sense each scanning line and to output relative position signals; the light sensitive components exposes each scanning line according to the position signal and repeats the above steps.
Description
Technical field
The invention relates to a kind of scanner and exposal control method thereof, and particularly relevant for uneven scanner of a kind of solution power source speed and exposal control method thereof.
Background technology
Please refer to Figure 1A, it shows known scanner structure schematic diagram.Scanner 100 comprises scanning platform 110, optical module 120, power source 130 and Application Specific Integrated Circuit (Application Specific Integrated Circuit, ASIC) 140.Power source 130 is to move at the uniform velocity to drive optical module 120, simultaneously by the optical sensing subassembly in the optical module 120 122, for example be that (Charge Coupled Device CCD), carries out the image capture of multi-strip scanning line to Charged Coupled Device to the file to be scanned on the scanning platform 110 111.Power source 130 has encoder 132, is used for outgoing position coherent signal PF.ASIC 140 is according to position coherent signal PF control power source 130, is used for the mobile precise positioning of doing to optical module 120.Therefore, can guarantee that the image width that each bar scan line captured is very even.
Yet, because the variation a little in the control of power source 130 constant speed can make that the different scan line time for exposure is inconsistent.Shown in Figure 1B, scanner 100 is to utilize the triggering of position coherent signal PF to decide time for exposure T1, T2, the T3 of optical sensing subassembly 122 sensings file 111 to be scanned.When the speed of power source 130 driving optical modules 120 was the constant speed of presetting, the time for exposure of a scan line of sensing was made as T1=t2-t0; When the speed of a certain scan line of power source 130 driving optical module 120 sensings was faster slightly than default constant speed, the time for exposure of this scan line of sensing was made as T2=t1-t0; And when the speed of a certain scan line of power source 130 driving optical module 120 sensings was slower slightly than default constant speed, the time for exposure of this scan line of sensing was made as T3=t3-t0.Because time for exposure T1, T2, the T3 of different scanning line are inconsistent, and according to formula: response coefficient (Responsibility) * time for exposure * AFE (analog front end) (Analog Front End, the AFE) yield value of the optical density of exposure=file 111 to be scanned (Light Density) * optical sensing subassembly 122.Therefore, put all by under the position feedback control at exposure start time point and concluding time, the exposure of each bar scan line of sensing is also inequality, thereby reduces the quality of scan-image.
Please refer to Fig. 1 C, it shows that United States Patent (USP) case case numbers 6037584 is disclosed based on the scanner line block diagram of d.c. motor as position feedback control.Because the optical density of file 111 to be scanned and the response coefficient of optical sensing subassembly 122 are generally definite value in whole scanning process, for the inconsistent problem of the exposure that solves above-mentioned different scanning line, this patent case is dynamically adjusted the AFE yield value and is compensated the inconsistent of time for exposure, makes the exposure unanimity of each bar scan line.
Scanner 150 utilizes d.c. motor 160 to drive optical module 170 and scans file to be scanned (not showing in the drawings).D.c. motor 160 has encoder 162, is used for the timer 182 of outgoing position coherent signal PF to ASIC 180.Exposure control unit 184 is controlled the time for exposure that CCD 172 treats each bar scan line of scanning document in the optical module 170 according to position coherent signal PF.The data of CCD 172 sensings file gained to be scanned exports simulation amplifying unit 174 to and is amplified.The ASIC 180 of this patent case also comprises gain control unit 186, accept the control of exposure control unit 184 and timer 182, dynamically adjust the AFE yield value of simulation amplifying unit 174, cause exposure inconsistent because of the time for exposure difference with compensation CCD 172 sensing different scanning lines.
Yet the disclosed scanner of above-mentioned patent case must add the complicated circuit of gain control unit 186 grades in order dynamically to adjust the AFE yield value in ASIC 180, increase design and manufacture cost; And the disclosed AFE gain compensation of this patent case is in analog compensation signal, need digital signal to convert time of analog signal to, and analog signal is subjected to external interference easily in transport process.In addition, the linearity of this kind analog compensation signal is also relatively poor, can't improve the scan-image quality.
Summary of the invention
In view of this, purpose of the present invention just provides a kind of scanner and exposal control method thereof.By the position feed back signal of exposure control unit according to power source, the time for exposure unanimity of each bar scan line of control optical sensing subassembly sensing is to provide stable scan-image quality.
According to purpose of the present invention, a kind of scanner is proposed, it comprises optical module, power source, arrangement for detecting and exposure control unit.Optical module comprises optical sensing subassembly, is used for the multi-strip scanning line of sensing one file to be scanned.Power source is to be used for making optical module and file to be scanned to produce one to relatively move.Arrangement for detecting is used for detecting the relative-movement state of optical module and file to be scanned generation, and exports a position coherent signal in view of the above to the exposure control unit.The exposure control unit comprises timer, is used for according to the position coherent signal, and the time for exposure of every scan line of control optical sensing subassembly sensing is a fixed value.Utilize exposure control unit internal control signal to control optical sensing subassembly, can make the exposure unanimity of each bar scan line of sensing, line construction is simple and can effectively improve the scan-image quality.
Optical sensing subassembly can have shutter, and timer is that the control shutter makes that the time for exposure is a fixed value.The exposure control unit is according to the position coherent signal, the exposure zero-time of each bar scan line of control optical sensing subassembly sensing.This fixed value is the difference less than the exposure zero-time of wantonly two adjacent scanning lines in the optical sensing subassembly sensing scan line.Optical sensing subassembly also comprises a plurality of optical diodes (Photo Diode) and shifts lock, and the exposure control unit comprises signal generator, is used for exporting control signal, triggers to shift lock charges accumulated in the optical diode is shifted out.According to purpose of the present invention, a kind of scan method is proposed, be used in scanner, be used for scanning file to be scanned.Scanner comprises an optical module and a power source.Power source is used for making optical module and file to be scanned to produce one and relatively moves.Arrangement for detecting is used for detecting the relative-movement state between optical module and file to be scanned.The exposure control unit is used for controlling the time for exposure of each bar scan line of optical sensing subassembly sensing.Optical module has at least one optical sensing subassembly, is used for the N bar scan line of sensing file to be scanned, and wherein N is a natural number, and the step of this method is summarized as follows: setting the K value is 1; Make optical module and file to be scanned be in the K relative position by power source; Arrangement for detecting is detected the K relative position and is produced K relative position coherent signal in view of the above; According to K relative position coherent signal, decision is to the K start time point of K bar scan line exposure; The control optical sensing subassembly carries out the exposure of set time according to start time point to K bar scan line; And whether judge the K value less than N, less than N, then the K value adds up 1 as if the K value, and gets back to the step that drives optical module.
The step of exposing of K bar scan line being carried out the set time also comprises the shutter that utilizes optical sensing subassembly, and the control optical sensing subassembly is to the K concluding time of K bar scan line exposure.The wherein difference of K concluding time and K zero-time set time for this reason, and set time is the difference less than (K+1) zero-time and K zero-time.
The step of exposing of K bar scan line being carried out the set time also can comprise: K bar scan line is exposed, and accumulate the K quantity of electric charge in optical sensing subassembly; And expose through after this set time, the transfer lock of the K quantity of electric charge from optical sensing subassembly shifted out.Coherent signal is directly controlled the time for exposure unanimity of optical sensing subassembly to each bar scan line, can reach stable scan-image quality.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. elaborates.
Description of drawings
Figure 1A shows known scanner structure schematic diagram based on power source;
Figure 1B shows CCD exposure time series control chart among Figure 1A;
Fig. 1 C shows United States Patent (USP) case case number 6037584 disclosed scanner line block diagrams based on d.c. motor;
Fig. 2 A shows the structural representation according to a preferred embodiment of the present invention scanner;
Fig. 2 B shows the structural representation according to another preferred embodiment scanner of the present invention;
Fig. 2 C shows the method flow diagram according to the embodiment scanner of Fig. 2 A of the present invention;
Fig. 2 D shows the method flow diagram according to the embodiment scanner of Fig. 2 B of the present invention;
Fig. 2 E shows the expose structural representation of control unit control optical sensing subassembly according to the present invention;
Fig. 2 F shows known and controls comparison diagram according to optical sensing subassembly exposure time series of the present invention.
Embodiment
Please refer to Fig. 2 A, it shows the structural representation according to a preferred embodiment of the present invention scanner.Scanner 200 comprises scanning platform 210, optical module 220, power source 230 (is example with a direct current motor at this) and exposure control unit 240.Exposure control unit 240 be one use special integrated circuit (Application Specific Integrated Circuit, ASIC).Scanning platform 210 is to be used for carrying file 211 to be scanned (is example with reflective file).Optical module 220 comprises light source 222, speculum 224 and optical sensing subassembly 226, wherein optical sensing subassembly 226 for example be CCD or contact image sensor (Contact Image Sensor, CIS).File to be scanned 211 reflections, are received by optical sensing subassembly 226 after speculum 224 reflections from light L that light source 222 is launched, and wherein optical sensing subassembly 226 is to be used for N (N is a natural number) the bar scan line (not being shown among the figure) of sensing file 211 to be scanned.For example: for resolution is the scanner of 600dpi, and per inch has 600 scan lines on the file 211 to be scanned.
Please refer to Fig. 2 B, be the structural representation of its demonstration according to another preferred embodiment scanner of the present invention.Scanner 200 comprises paper carrier 212, optical module 220, power source 230 (is example with a direct current motor at this) and exposure control unit 240.The place different with the embodiment of Fig. 2 A is that power source 230 is to drive paper carrier 212 to present file 211 to be scanned and make it and a fixed optical module generation one relatively moves.All the other exposure control sections are identical with the embodiment of Fig. 2 A, do not giving unnecessary details at this.
Please refer to Fig. 2 C, it shows the scan method flow chart according to the embodiment of Fig. 2 A of the present invention.At first, in step 300, setting the K value is 1.Then, in step 310, utilize power source 230 to drive optical module 220 and move to the K position, with the K bar scan line of sensing file 211 to be scanned.In step 320,, and export the K position coherent signal PF of corresponding K position by arrangement for detecting 234 these K positions of detecting.In step 330, according to K position coherent signal PF, decision is to the K start time point of K bar scan line exposure by the timer 2 42 of ASIC 240.Then step 340 is controlled optical sensing subassembly 226 according to the K start time point, and K bar scan line is carried out the exposure of set time T.At last,, whether judge the K value, if the K value less than N, then in step 360, adds up 1 with the K value, and gets back to step 310 less than N in step 350.If the K value is not less than N, then finish scanning motion.
Please refer to Fig. 2 D, it shows the scan method flow chart according to the embodiment of Fig. 2 B of the present invention.Be in step 410 different with Fig. 2 C is to utilize the drive power source paper carrier to present file to the K to be scanned position, allows the K bar scan line of optical module sensing file 211 to be scanned.All the other steps are all roughly the same with above-mentioned Fig. 2 C, do not giving unnecessary details at this.
As previously mentioned, though because power source 230 drives optical module 220 with constant speed, in fact, optical module 220 whenever moves a step pitch and has difference a little from institute's time spent.Therefore, the time for exposure difference of each bar scan line of optical sensing subassembly 226 sensings, thereby exposure is also different, and then influence the quality of scan-image.Purpose of the present invention is exactly to make that the time for exposure of each bar scan line of sensing is identical, to reach identical exposure.
Please refer to Fig. 2 E, it shows the expose structural representation of control unit 240 control optical sensing subassemblies 226 according to the present invention.Optical sensing subassembly 226 comprises electronic shutter (Shutter) 223, optical diode 225 and simulation offset buffer (ShiftRegister) 229, and optical diode 225 has transfer lock (Transfer Gate) 227.Electronic shutter 223 is to be used for controlling the time point that optical diode 225 receives light.When 223 one-tenth channel status of electronic shutter, the electric charge on the optical diode 225 is constantly to flow out, and this moment, optical diode 225 can't stored charge.When electronic shutter became closed circuit state, optical diode 225 could begin stored charge.Exposure control unit 240 comprises signal generator 241 and timer 2 42.Signal generator 242 is to be used for sending control signal TG to give transfer lock 227, and control is accumulated in the electric charge of optical diode 225 and transfers to offset buffer 229.
Please also refer to Fig. 2 F, it shows optical sensing subassembly 226 exposure time series control comparison diagram known and according to Fig. 2 A embodiment of the present invention.Timer 2 42 is according to position coherent signal PF, via the exposure zero-time t of every scan line of signal generator 241 control optical sensing subassembly 226 sensings
ON(k), k=1 ~ N wherein.In the known technology, the end exposure time t of sensing k bar scan line
OFF(k), be the exposure zero-time t of sensing (k+1) bar scan line simultaneously
ON(k+1), shown in first figure among Fig. 2 F.The end exposure time t of corresponding each bar scan line
OFF(k) can be because power source 230 drives speed difference that optical modules 220 move difference, thereby cause time for exposure Te (k) (=t
OFF(k)-t
ON(k)) inconsistent.
Yet the present invention utilizes timer 2 42 control electronic shutters 223, and determines end exposure time t with closing of electronic shutter 223
OFF' (k).Therefore, (k) (=t of time for exposure Te '
OFF' (k)-t
ON(k)) may be controlled to fixed value, shown in second figure among Fig. 2 F.And this fixed value Te ' is the exposure zero-time interval that is slightly smaller than wantonly two adjacent scanning lines of optical sensing subassembly 226 sensings, i.e. t (k)
ON(k+1)-t
ON(k), k=1 ~ N wherein.Therefore, can guarantee that the time for exposure of each bar scan line of optical sensing subassembly 226 sensings is enough and consistent, improve the scan-image quality.In the above embodiments, though be that example explains with reflective file to be scanned 211, right the present invention is also applicable to the file to be scanned of transmission-type.Power source used herein is not limited to d.c. motor, and every relative position state that can be detected optical module and file to be scanned all is applicable to the present invention.
Spirit of the present invention is to utilize the relative position state of optical module that arrangement for detecting detects and file to be scanned and produces a position coherent signal, and determines the exposure start time point of optical sensing subassembly in view of the above.And utilize the time for exposure of the exposure control unit control optical sensing subassembly in the scanner is a fixed value.
Advantage of the present invention has not only solved the uneven problem of motor speed of known technology, and the dynamic accent AFE yield value circuit design that need not set up a complexity in addition as U.S. case US6037584 has increased design and manufacture cost in scanner.Reach stable scan-image quality simultaneously.In sum; though the present invention discloses as above with a preferred embodiment; so it is not to be used for limiting the present invention; anyly have the knack of those skilled in the art; without departing from the spirit and scope of the present invention; when can doing various changes and modification, so protection scope of the present invention is as the criterion when the scope of the content that look claims of the present invention.
The drawing reference numeral explanation
100,150,200: scanner
110,210: scanning platform
111,211: file to be scanned
120,170,220: optical module
122,226: optical sensing subassembly
130,230: power source
132,162: encoder
140、180、240：ASIC
160: d.c. motor
172：CCD
174: the simulation amplifying unit
182,242: timer
184: the exposure control unit
186: gain control unit
211: file to be scanned
212: paper carrier
222: light source
223: electronic shutter
224: speculum
225: optical diode
227: shift lock
229: the simulation offset buffer
232: the sequential band
234: arrangement for detecting
241: signal generator
Claims (18)
1. a scanner is used for scanning the multi-strip scanning line of a file to be scanned, it is characterized in that described scanner comprises:
One optical module comprises at least one optical sensing subassembly, is used for multi-strip scanning line exposing to described file to be scanned, produces corresponding image data in view of the above;
One power source is used for making described optical module and described file to be scanned to produce one and relatively moves;
One arrangement for detecting is used for detecting the relative-movement state between described optical module and described file to be scanned, and produces a corresponding signal in view of the above; And
One exposure control unit comprises a timer, and the time for exposure that is used for controlling described these scan lines of optical sensing subassembly sensing is a fixed value;
Wherein, described exposure control unit is the start time point according to the described described time for exposure of signal deciding.
2. scanner as claimed in claim 1, it is characterized in that, described optical sensing subassembly comprises that a plurality of optical diodes and shift lock, and described exposure control unit comprises a signal generator, be used for exporting a control signal, migrate out charges accumulated in described a plurality of optical diode to trigger described transfer lock.
3. scanner as claimed in claim 1 is characterized in that described optical sensing subassembly comprises a shutter, and described exposure control unit be control described shutter, make that the described time for exposure is described fixed value.
4. scanner as claimed in claim 1 is characterized in that, described power source is a direct current motor.
5. scanner as claimed in claim 1 is characterized in that, described signal is the relative position coherent signal between described optical module and described file to be scanned.
6. scanner as claimed in claim 5 is characterized in that described arrangement for detecting comprises an encoder, is used for exporting described position feed back signal to described exposure control unit.
7. scanner as claimed in claim 1 is characterized in that, described fixed value is less than the difference of the described exposure zero-time of wantonly two adjacent scanning lines in described these scan lines of optical sensing subassembly sensing.
8. scanner as claimed in claim 1 is characterized in that, described optical sensing subassembly is a Charged Coupled Device.
9. scanner as claimed in claim 1 is characterized in that, described optical sensing subassembly is a contact image sensor.
10. scanner as claimed in claim 1 is characterized in that, described relatively moving is to be produced by the described optical module of described drive power source.
11. scanner as claimed in claim 1 is characterized in that, also comprises a paper carrier, wherein said relatively moving is to be presented described file to be scanned and produced by the described paper carrier of described drive power source.
12. scan method, be used in the one scan instrument, be used for scanning a file to be scanned, described scanner comprises an optical module, one power source, one arrangement for detecting and an exposure control unit, described power source is used for making described optical module and described file to be scanned to produce one and relatively moves, described arrangement for detecting is used for detecting the described relative-movement state between described optical module and described file to be scanned, described exposure control unit is used for controlling a time for exposure of described these scan lines of optical sensing subassembly sensing, described optical module has at least one optical sensing subassembly, be used for the N bar scan line of the described file to be scanned of sensing, wherein N is a natural number, and described method comprises:
Setting a K value is 1;
Make described optical module and described file to be scanned be in the K relative position of corresponding K bar scan line by described power source;
Described arrangement for detecting is detected described K relative position and is produced K relative position coherent signal in view of the above;
According to described K relative position coherent signal, decision is to the K start time point of described K bar scan line exposure;
Control described optical sensing subassembly described K bar scan line is carried out the exposure of set time according to described K start time point; And
Whether judge described K value less than N, less than N, then described K value adds up 1 as if described K value, and gets back to the described step that drives described power source.
13. method as claimed in claim 12 is characterized in that, described K bar scan line is carried out the step of exposing of set time also comprise:
Utilize the shutter of described optical sensing subassembly, control the K concluding time of described optical sensing subassembly to described K bar scan line exposure, the difference of wherein said K concluding time and described K zero-time is the described set time.
14. method as claimed in claim 12 is characterized in that, the described set time is less than the difference of described (K+1) zero-time and described K zero-time.
15. method as claimed in claim 12 is characterized in that, described K bar scan line is carried out the step of exposing of set time comprise:
Described K bar scan line is exposed, and in described optical sensing subassembly, accumulate a K quantity of electric charge; And
Exposure is shifted lock with the described K quantity of electric charge from one of described optical sensing subassembly and is shifted out through after the described set time.
16. method as claimed in claim 12 is characterized in that, described power source is a direct current motor, and described arrangement for detecting is an encoder, is used for producing described K relative position coherent signal.
17. method as claimed in claim 12 is characterized in that, described K relative position by the described optical module of described drive power source with respect to described file to be scanned move form.
18. method as claimed in claim 12 is characterized in that, described K relative position be by described power source drive described file to be scanned with respect to described scan module move form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100185593A CN100515013C (en) | 2004-05-21 | 2004-05-21 | Scanner and exposure control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100185593A CN100515013C (en) | 2004-05-21 | 2004-05-21 | Scanner and exposure control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1700724A true CN1700724A (en) | 2005-11-23 |
| CN100515013C CN100515013C (en) | 2009-07-15 |
Family
ID=35476570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100185593A Expired - Fee Related CN100515013C (en) | 2004-05-21 | 2004-05-21 | Scanner and exposure control method thereof |
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| Country | Link |
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| CN (1) | CN100515013C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736421A (en) * | 2011-03-31 | 2012-10-17 | 上海微电子装备有限公司 | Proximity contact scan exposure device and method |
| CN106954001A (en) * | 2017-02-17 | 2017-07-14 | 杭州朔天科技有限公司 | A kind of scanning sequence control method for multi-function printer chip |
| US20230353692A1 (en) * | 2020-09-15 | 2023-11-02 | Weihai Hualing Opto-Electronics Co., Ltd. | Contact image sensor |
-
2004
- 2004-05-21 CN CNB2004100185593A patent/CN100515013C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736421A (en) * | 2011-03-31 | 2012-10-17 | 上海微电子装备有限公司 | Proximity contact scan exposure device and method |
| CN102736421B (en) * | 2011-03-31 | 2015-06-17 | 上海微电子装备有限公司 | Proximity contact scan exposure device and method |
| CN106954001A (en) * | 2017-02-17 | 2017-07-14 | 杭州朔天科技有限公司 | A kind of scanning sequence control method for multi-function printer chip |
| CN106954001B (en) * | 2017-02-17 | 2019-05-31 | 杭州朔天科技有限公司 | A kind of scanning sequence control method for multi-function printer chip |
| US20230353692A1 (en) * | 2020-09-15 | 2023-11-02 | Weihai Hualing Opto-Electronics Co., Ltd. | Contact image sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100515013C (en) | 2009-07-15 |
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Granted publication date: 20090715 |