CN2509654Y

CN2509654Y - Scanning apparatus

Info

Publication number: CN2509654Y
Application number: CN01266892U
Authority: CN
Inventors: 陈琰成
Original assignee: Avision Inc
Current assignee: Avision Inc
Priority date: 2001-11-07
Filing date: 2001-11-07
Publication date: 2002-09-04
Anticipated expiration: 2011-11-07

Abstract

The utility model discloses a scanning apparatus that can calibrate the step angle difference of the step motor and consists of a shell, a transparent platform, a scanning module, a step motor and a calibration paper, wherein, the transparent platform is arranged on the shell and is used for placing documents awaiting scanning, the scanning module is installed inside the shell and is used for scanning documents by moving back and forth. The step motor is arranged inside the shell and is used for driving the scanning module, and the calibration paper is arranged at the front end of the shell and is provided with a straight line that is used for calibrating the step angle difference of the step motor.

Description

Scanister

Technical field

The utility model relates to a kind of scanister of recoverable minimum angles error, particularly relates to a kind of scanister of stepping angular error (step angle error) of recoverable step motor.

Background technology

Scanister is very general computer peripheral product, it not only can be used to scanning document and produces corresponding view data, some additional function can also be provided, can view data be faxed to other facsimile units by telephone wire as scanister, or connect a network and send view data to other people with the form of Email (e-mail), or reach copy function etc. by connecting a printer.Therefore, the function of scanister maximum is a duplicating image, and along with the prosperity day by day of Information technology, the user is also more and more high to the quality requirements of scan image, so it is very important avoiding error because of hardware in the scanister or software to cause the error of scan image.

Please refer to Fig. 1, Fig. 1 is the synoptic diagram of an existing scanister 10.Scanister 10 includes a housing 12, one transparent platform 14 is arranged on the housing 12, be used for placing a file 20 to be scanned, one scan module 16 is arranged in the housing 12, can move forward and backward to scan a file 20 to be scanned, and producing corresponding document image signal, a step motor 18 is arranged in the housing 12 and is electrically connected on scan module 16, is used for moving forward and backward to carry out scanning work with the mode driven sweep module 16 of stepping.

Step motor 18 moves forward and backward to scan file 20 to be scanned with the mode driven sweep module step by step 16 of stepping, in theory, the step motor 18 revolutions theoretical span that institute's driven sweep module 16 advances that moves a step should equate, theoretical span is that step motor 18 rotates the number of steps purpose merchant that distance that a circle institute driven sweep module 16 advances and step motor 18 rotate a circle.But in fact because the error of making often makes step motor 18 have the stepping angular error, the span that each the step institute's driven sweep module 16 during promptly step motor 18 turns around is advanced is also inequality.

Please refer to Fig. 2 a and Fig. 2 b, Fig. 2 a is the synoptic diagram of file to be scanned, and Fig. 2 b is the synoptic diagram of the image after the file scan to be scanned among Fig. 2 a.Shown in Fig. 2 a, three parallel lines 21 are arranged on the file to be scanned, the distance 22 and 24 of being separated by between line and the line equates.Because step motor 18 existing stepping angular errors, the document image that makes scanning come out will have the difference of some with the image of reality.Shown in Fig. 2 b, the distance 26 of between the image of three parallel lines 21 on the microcosmic, being separated by and 28 and unequal.Hence one can see that, and the stepping angular error of step motor 18 will cause the distortion of scan image.Except step motor, other have angular error similar in appearance to step motor too as servo motor, and the light and dark angle of spoke wheel often exists small angular error in the servo motor, and this minute angle error will make the image fault of scanning gained.Under the not high situation of the image resolution ratio of scanister, the image error that this stepping angular error is caused is perhaps also not obvious, but under the very high situation of image resolution ratio, the image error that this stepping angular error is caused just becomes clearly, require more and more high information society for image quality, the error of this scan image becomes and is difficult to accept.

The utility model content

The purpose of this utility model is to provide a kind of scanister of stepping angular error of recoverable step motor, to address the above problem.

The purpose of this utility model is achieved in that promptly provides a kind of scanister, and it comprises: a housing; One is used for placing the transparent platform of a file to be scanned, is located on the described housing; One is used for being installed in the described housing can the mode of moving forward and backward to scan the scan module of described file to be scanned; One drives the motor of described scan module before and after being used for, and is installed in the described housing; One standard paper (calibrationpaper) is located at the front end of described housing, and described standard paper is provided with one and is used for proofreading and correct the figure of described motor stepping error that angle produces; Wherein said scan module first figure on the described standard paper of scanning before the described file to be scanned of scanning, and proofread and correct the image that described scan module is produced behind the described file to be scanned of scanning according to the difference that described scan module scans the real image of image that figure produced on the described standard paper and described figure.

The advantage of the utility model device is that it makes the straight line that scans earlier on its standard paper by the setting of standard paper when beginning to scan, produce image difference thus, and it is proofreaied and correct, thereby improve the sharpness and the accuracy of scan image, improve quality of scanning.

Description of drawings

Fig. 1 is the synoptic diagram of an existing scanister;

Fig. 2 a is the synoptic diagram of file to be scanned;

Fig. 2 b is the synoptic diagram of the image after the file scan to be scanned among Fig. 2 a;

Fig. 3 is the synoptic diagram of the utility model scanister;

Fig. 4 is the top view of the utility model scanister;

Fig. 5 scans the image that obtains behind the straight line for Fig. 4 scanister.

Embodiment

Please refer to Fig. 3, Fig. 3 is the synoptic diagram of the utility model scanister 50.Scanister 50 includes a housing 52, one transparent platform 54 is arranged on the housing 52, be used for placing a file 60 to be scanned, one scan module 56 is arranged in the housing 52, can move forward and backward to scan a file 60 to be scanned, and produce corresponding document image signal, one step motor 58 is arranged in the housing 52 and is electrically connected on scan module 56, be used for moving forward and backward to carry out scanning work with the mode driven sweep module 56 of stepping, one control circuit 57 is located in the housing 52, be used for the operation of gated sweep device 50, and one standard paper (calibration paper) 62 be arranged at the front end of housing 52, which is provided with a straight line 64, the straight line 64 on the first scanning standard paper 62 of meeting before the scan module 56 scannings file 60 to be scanned.

Please refer to Fig. 4 and Fig. 5, Fig. 4 is the top view of scanister 50, and Fig. 5 scans the image that obtains behind the straight lines 64 for scanister 50.As shown in Figure 4, straight line 64 on the standard paper 62 is 4 to 7 degree with the angle of the horizontal side of standard paper 62, generally between 5 to 6 degree, straight line 64 needs greater than step motor 58 distance that the scan module that drives 56 advances that turns around in the projected length 66 of the vertical side edge of standard paper 62.Scan module 56 is straight line 64 on the first scanning standard paper 62 of meeting before scanning file 60 to be scanned, because the stepping angular error of step motor 58, so the straight line 64 that obtains after making scanister 50 scan can be unequal zigzag as shown in Figure 5.Scanister 50 includes a storer 72 in addition, stores a comparison sheet 74 in the storer 72, and it has write down the theoretical span t that each the step institute's driven sweep module 56 during step motor 58 turns around is advanced respectively ₁, and during step motor 58 driven sweep modules 56 scanning straight lines 64, the actual stride t that scan module 56 advances ₂, this actual stride t ₂Can get by unequal zigzag amount.The bottom centre of standard paper 62 has one with reference to black patch 70, the left front end of transparent platform 54 also has a reference point 68, storer 72 has write down from reference black patch 70 to reference point 68 vertical range y, and its purpose just can enter scanning area for inform the scan module 56 y distance that readvances after leaving with reference to black patch 70.

When scan module 56 scanning straight lines 64 and allow comparison sheet 74 in the storer 72 obtain the step motor 58 actual stride t that drive scan module 56 advances that whenever takes a step forward ₂After, step motor 58 can continue driven sweep module 56 and advance, and storer 72 can write down the step number n that step motor 58 advances.Then, scan module 56 can be through with reference to black patch 70, and this moment, storer 72 can continue the step number n that record step motor 58 advance, and the actual range that advances after leaving with reference to black patch 70 of scan module 56.The actual range that advances after scan module 56 leaves with reference to black patch 70 just is equal to or greater than y value back (being after scan module 56 begins to enter scanning area), when step motor 58 driven sweep modules again 56 take a step forward, scanister 50 just can begin to come with 74 recorded data of the comparison sheet in the storer 72 image of correct scan module 56 scannings, so just, can guarantee the authenticity of institute's scan image, wherein in the comparison sheet 74, n is a step number, t ₁Be theoretical span; t ₂Be actual stride.

Scan module 56 leaves with reference to the actual range that advances to scanning area behind the black patch 70 and can be learnt by following method: suppose that scan module 56 forwards m at step motor 58 and leaves with reference to black patch 70 during the step, so ensuing step motor 58 can change the m+1 step, and step motor 58 is found out in storer 72 meetings this moment from comparison sheet 74 change the m+1 actual stride t that the scan module that drives 56 advances during the step ₂, suppose this actual stride t ₂Being x1, is that to leave the actual ranges that advanced with reference to black patch 70 back be x1 to scan module 56 so.Then, step motor 58 will change the m+2 step, and similarly, storer 72 can be found out step motor 58 from comparison sheet 74 change the actual stride t that m+2 time in step institute's driven sweep module 56 is advanced ₂, suppose this actual stride t ₂Be x2, so at this time scan module 56 leaves with reference to the actual range that is advanced behind the black patch 70 and just is x1+x2, and then step motor 58 can go on foot by commentaries on classics m+3, and similarly storer 72 can be found out m+3 and go on foot pairing actual stride t from comparison sheet 74 ₂Be x3, scan module 56 left with reference to the actual range that is advanced behind the black patch 70 and just was x1+x2+x3 this moment.So step motor one step of 58 revolutions, storer 72 just can be corresponding actual stride t ₂Add in the actual range, just be equal to or greater than y value back (being after scan module 56 begins to enter scanning area) until this actual range, when step motor 58 driven sweep modules again 56 took a step forward, scanister 50 just can begin to come with 74 recorded data of the comparison sheet in the storer 72 image of correct scan module 56 scannings.

In addition, when the straight line 64 on the scan module 56 scanning standard paper 62, storer 72 also can be chosen step motor 58 and rotate two circles or the actual stride t that advances of multi-turn institute driven sweep module 56 more ₂, again these actual stride t ₂Be recorded in the comparison sheet 74 after average, to increase the accuracy of timing.

The above is for being example with the step motor, but also can same method proofread and correct its angular error for the device that servo motor etc. has a minimum angles error.

With existing scanister 10, the utility model scanister 50 has a standard paper 62, and the straight line 64 when scanister 50 begins to scan on the first scanning standard paper 62 of meeting is to obtain the actual stride t that step motor 58 driven sweep modules 56 are advanced ₂In addition, the comparison sheet 74 in the utility model scanister 50 will write down the theoretical span t that step motor 58 driven sweep modules 56 are advanced respectively ₁And actual stride t ₂, so, when scan module 56 begins to scan file 60 to be scanned, just can come the image after the scanning is proofreaied and correct according to the data on this comparison sheet 74, so just can increase the authenticity of scan image.

Except image do is proofreaied and correct, mode that also can circuit control, the correction of motor being made minute angle drives, and makes actual stride t ₂With theoretical span t ₁Equate.

Though the foregoing description be with a straight line as reference pattern, the utility model is not defined in this, as long as use any known pattern, all effect of attainable cost utility model.

Claims

1. a scanister is characterized in that, comprising: a housing; One is used for placing the transparent platform of a file to be scanned, is located on the described housing; One is used for being installed in the described housing can the mode of moving forward and backward to scan the scan module of described file to be scanned; One drives the motor of described scan module before and after being used for, and is installed in the described housing; One standard paper (calibration paper) is located at the front end of described housing, and described standard paper is provided with one and is used for proofreading and correct the figure of described motor stepping error that angle produces; Wherein said scan module first figure on the described standard paper of scanning before the described file to be scanned of scanning, and proofread and correct the image that described scan module is produced behind the described file to be scanned of scanning according to the difference that described scan module scans the real image of image that figure produced on the described standard paper and described figure.

2. scanister as claimed in claim 1 is characterized in that, described figure is for becoming the straight line at an oblique angle with the horizontal side of described standard paper.

3. scanister as claimed in claim 2 is characterized in that, the horizontal side of described straight line and described standard paper is 4 to 7 degree.

4. scanister as claimed in claim 1, it is characterized in that, other comprises that one is used for writing down the storer of described figure and described transparent platform front end distance, store a comparison sheet in the described storer, it scans the image that figure produced on the described standard paper and the real image of described figure according to described scan module, writes down the theoretical span t that described motor in fact whenever takes a step forward and makes actual stride t2 that described scan module produces and described motor whenever take a step forward in theory described scan module is produced ₁, described scan module is by the distance of the front end of described figure and described transparent platform and each actual stride t that described comparison sheet write down ₂With theoretical span t ₁, proofread and correct the image that described scan module is produced behind the described file to be scanned of scanning.

5. scanister as claimed in claim 4 is characterized in that, the distance of the front end of described figure and described transparent platform is the distance of the front end of nearest end of the described transparent platform of described Graph Distance and described transparent platform.

6. scanister as claimed in claim 4 is characterized in that, described theoretical span t ₁Equal described revolution one circle and moved the distance of described scan module and the number of steps purpose merchant of described revolution one circle.

7. scanister as claimed in claim 1 is characterized in that, described figure equals the distance that described revolution one circle is moved described scan module at least in the length of vertical direction.

8. scanister as claimed in claim 1 is characterized in that, described motor is a step motor (step motor).

9. scanister as claimed in claim 1 is characterized in that, described motor is a servo motor (servomotor).