CN2447863Y - Scanner with duplex scan correction - Google Patents

Abstract

A scanner with double-sided scanning correction function comprises an automatic paper feeder, an upper optical machine and upper correction paper, wherein the upper optical machine is fixed in the automatic paper feeder, and the upper correction paper is arranged below the upper optical machine; or the upper optical machine is arranged in the automatic paper feeding device and is movable, and the upper correction paper is fixed in the scanner and corresponds to the upper optical machine. Before the scanning, produce relative movement between upper portion ray apparatus and upper portion correction paper for rectify the light information, the utility model discloses can reduce the influence of the spot of upper portion correction paper to the correction of light information, and improve the quality of scanning image.

Description

Scanner with duplex scan correction

The utility model relates to a scanner with the function of double-sided scanning and correction, in particular to a scanner with double-sided scanning and correction which can correct optical information well.

With the rapid development of scanners, users' requirements on the quality of scanned images are also increasing. Please refer to FIG. 1 , which shows a schematic diagram of a conventional flatbed scanner. The flatbed scanner 100 has a housing 102, on which a glass platform 104 for scanning documents (not shown in the figure) is placed, and a lower optical machine (Carriage) 106 is arranged inside the outer housing 102, and a light source is arranged on the lower optical machine 106 device 108 . The flatbed scanner 100 uses the pulling (dragging) element 110 to drive the lower optical machine 106 to move back and forth in the Y direction, and the connection device 112 is used to connect the lower optical machine 106 and the pulling element 110 .

When the scanning operation starts, the pulling element 110 drives the lower optical machine 106 and the light source device 108 disposed on the lower optical machine 106 through the connecting device 112 . At this time, the light source device 108 emits light, which is reflected by the scanned document on the glass platform 104, then reflected by a plurality of mirrors 114, and concentrated by the lens 116, then the light signal is received by the photoelectric sensor 118 and converted into The flatbed scanner 100 then processes the electrical signal, and so on in order to complete the scanning action.

Wherein, the photoelectric sensing element 118 can be a charge coupled device (Charge Coupled Device, CCD), a contact image sensor (Contact Image Sensor, CIS), or other sensing elements that can convert optical signals into electrical signals. The traction element 110 can be a steel rope, a belt, or other elements that can drive the lower optical machine 106 to move. The traction element 110 is also connected to a transmission device (not shown in the figure). The transmission device is, for example, composed of a reduction gear set and a motor.

Please refer to FIG. 2 , which shows a top view of the flatbed scanner in FIG. 1 when correcting optical information (information). Please refer to Figure 1 and Figure 2 at the same time. Before performing the above-mentioned scanning operation, the scanner 100 must perform optical information correction, including color correction, brightness correction and contrast correction, and so on. In FIG. 1 , the scanner 100 further includes a lower calibration paper (Calibration Paper) 120, and the lower calibration paper 120 is fixed on the glass platform 104. The lower calibration paper 120 is the same as the lower optical machine 106 and both extend along the X direction. The lower calibration paper 120 has multiple uses. Besides optical information calibration, it can also be used to perform other calibrations, such as scanning start point calibration and so on.

Taking color calibration as an example, the lower calibration paper 120 includes a white area for the scanner 100 as standard white, or a black area as standard black, and the present invention uses standard white for illustration. When performing color correction, the pulling element 110 moves the lower optical machine 106 to the lower part of the calibration paper 120 through the connecting device 112 . The lower optical machine 106 then scans a scan line 202 on the lower calibration paper 120 . The scan line 202 is parallel to the lower optomechanic 106 . When the light source device 108 emits light, the light is reflected by the lower calibration paper 120, and the light signal is received by the photoelectric sensor 118, and then converted into an analog electrical signal for processing. The analog electrical signal corresponding to standard white is converted into a standard white digital value. In this way, the action of color correction is completed. Wherein, all sensing units in the photoelectric sensing element 118 respectively correspond to a standard white digital value. The standard white digital value corresponding to each sensing unit may be different.

After obtaining the standard white digital value of each sensing unit in the photoelectric sensing element 118, the analog electrical signal of the document to be scanned obtained by each sensing unit in the photoelectric sensing element 118 can be compared with The digital value corresponding to each pixel (pixel) in the file to be scanned can be obtained by comparing the standard white analog electrical signals of each sensing unit. Because the brightness of the two ends of the light source device 108 is relatively dark, after converting each pixel of the document to be scanned into a digital value, digital signal processing can be used to process the scanned image near the two ends of the light source device 108 in the document to be scanned. The corresponding digital value performs a compensation action to improve the quality of the scanned image.

However, in the process of fixing and pasting the lower calibration paper 120 on the glass platform 104, it is likely that the lower calibration paper 120 will be damaged due to the adhesive sticking to the lower calibration paper 120 or dust impurities on the lower calibration paper 120. Stains are generated, which affect the light intensity reflected by the lower calibration paper 120 . In this way, color correction will be wrong. Therefore, the general practice is to make the lower optical machine 106 scan a plurality of scanning lines 202 on the lower calibration paper 120, for example, 50, and then use the standard white numbers corresponding to each sensing unit obtained by each scan Values are averaged to reduce the influence of the smear of the lower calibration paper 120, so as to reduce the error of color calibration.

Please refer to FIG. 3 , which is a schematic diagram of a conventional scanner with double-sided scanning function corresponding to FIG. 1 . In order to achieve the double-sided scanning function, the existing method is to install an automatic document feeder (Automatic Document Feeder, ADF) 302 with an upper optical machine 308 on the flatbed scanner 100 . After the paper (not shown in the figure) is fed from the paper feeding frame 304 of the automatic paper feeding device 302 , the paper will be transported to the paper output frame 306 along the paper guide track (not shown in the figure). When the paper is conveyed in the paper guide track, the upper optical machine 308 in the automatic paper feeding device 302 can scan the first side of the paper. The lower optical machine 106 can scan the second side of the paper from the bottom of the paper. In this way, the function of duplex scanning can be achieved. Wherein, the upper optical machine 308 is permanently fixed in the automatic paper feeding device 302 .

Similarly, before the upper optical machine 308 scans the paper, the correction of the optical information must be completed first. Taking color correction as an example, the light source device 310 in the upper light engine 308 emits light, which is reflected by the upper correction paper 314 fixed on the glass platform 104, and then reflected by a plurality of mirrors 318, and concentrated by the lens 320 After that, it is received by the photoelectric sensor 316 in the upper optical engine 308, and the photoelectric sensor 316 converts the optical signal into an analog electrical signal. The standard white analog electrical signal corresponding to the upper calibration paper 314 is replaced with a standard white digital value corresponding to the upper optical machine 308 .

However, for the scanner 100 with the automatic document feeding device 302 , there will be situations where the upper optical machine 308 in the automatic document feeding device 302 cannot scan the upper calibration paper 314 with multiple scanning lines. Because the upper optical machine 308 is fixed in the automatic paper feeding device 302 , and the upper calibration paper 314 is also fixed on the glass platform 104 , there is no relative movement between the two. Therefore, when the upper optical machine 308 performs calibration of optical information, it can only scan to a certain specific scanning line on the upper calibration paper 314, but cannot scan multiple scanning lines on the upper calibration paper 314. , to obtain the average value of the standard white digits. When the upper calibration paper 314 is stained or poor in quality, the obtained standard white digital value of the upper optical machine 308 will have a large error. In this way, the quality of the scanned image will be greatly affected.

The purpose of this utility model is to provide a scanner with double-sided scanning and correction function, which can enable the upper optical mechanism of the automatic paper feeding device to perform multiple scanning lines on the upper correction paper to obtain the average value of the correction value. In this way, it is possible to reduce the influence of the upper correction paper from affecting the correction of optical information due to its stains, and improve the quality of scanned images.

The purpose of this utility model is achieved by providing a scanner with double-sided scanning correction function, including an automatic paper feeding device, the scanner includes: an upper optical machine, which is arranged in the automatic paper feeding device; And an upper calibration paper which has relative movement between the upper optical machine and the upper optical machine before scanning is arranged under the upper optical machine, so as to correct the optical information.

Below in conjunction with accompanying drawing, describe the embodiment of the utility model in detail, wherein:

FIG. 1 is a schematic diagram of an existing flatbed scanner;

FIG. 2 is a top view of the flatbed scanner of FIG. 1 when correcting optical information;

FIG. 3 is a schematic diagram corresponding to FIG. 1 of an existing scanner with a double-sided scanning function;

FIG. 4 is a schematic diagram of a scanner with double-sided scanning correction function according to the first embodiment of the present invention;

FIG. 5 is a schematic diagram of a scanner with double-sided scanning correction function according to the second embodiment of the present invention.

In order to achieve the purpose of the utility model, relative motion can be generated between the upper optical machine and the upper calibration paper in the scanner with double-sided scanning correction function of the utility model, so that the automatic document feeder (Automatic Document Feeder, ADF ) The upper optical engine in the upper calibration paper can scan the upper calibration paper with multiple scanning lines for calibration of optical information.

The scanner with double-sided scanning and correction function of the utility model includes an automatic paper feeding device, and further includes an upper optical machine and an upper correction paper. The upper optical machine is fixed in the automatic paper feeding device. The upper calibration paper is set under the upper optical machine. Before scanning, there is relative movement between the upper optical machine and the upper calibration paper for calibration of optical information.

Another way to achieve the purpose of the utility model is to set the upper optical machine in the automatic paper feeding device, and the upper calibration paper is fixed in the scanner and corresponds to the upper optical machine. Before scanning, there is relative movement between the upper optical machine and the upper calibration paper for optical information calibration. Its embodiment is as follows.

Please refer to FIG. 4 , which shows a schematic diagram of a scanner with double-sided scanning correction function according to a first embodiment of the present invention. The scanner 400 has a housing 402 on which a glass platform 404 for scanning documents (not shown in the figure) is placed. The housing 402 has a lower optical unit (Carriage) 406 inside, and a light source device 408 is arranged on the lower optical unit 406. . The scanner 400 uses the pulling element 410 to drive the lower optical machine 406 to move back and forth in the Y direction, and the connecting device 412 is used to connect the lower optical machine 406 and the pulling element 410 . The traction element 110 can be a steel rope, a belt, or other elements that can drive the lower optical machine 406 to move. The traction element 410 is also connected with a transmission device (not shown in the figure). The transmission device is, for example, composed of a reduction gear set and a motor.

The scanner 400 equipped with an automatic document feeder 416 with an upper optical engine 422 has a duplex scanning function. The automatic paper feeding device 416 is mounted on the casing 402 . After the paper (not shown in the figure) is fed from the paper feeding frame 418 of the automatic paper feeding device 416 , the paper will be transported to the paper output frame 420 along the paper guide track (not shown in the figure). When the paper is conveyed in the paper guide track, the upper optical machine 422 in the automatic paper feeding device 416 can scan the first side of the paper. The lower optical engine 406 can scan the second side of the paper. Wherein, the upper optical machine 422 is fixed in the automatic paper feeding device 416 .

Before the lower optical engine 406 performs the scanning operation, the correction of the optical information must be completed first. That is, the pulling element 410 will move the lower optical machine 406 to the lower part of the calibration paper 414 to perform optical information calibration. Wherein, the lower calibration paper 414 is fixed on the glass platform 404 .

Similarly, before the upper optical machine 422 scans the paper, the correction of the optical information must be completed first. In order to achieve the purpose of the present invention, relative movement must occur between the upper optical machine 422 and the upper calibration paper 428 to correct optical information. Therefore, an extension platform 426 can be extended on the lower optical machine 406 , and the upper calibration paper 428 can be fixed on the extension platform 426 . The upper calibration paper 428 is driven by the movement of the lower optical machine 406 to achieve the purpose of relative movement between the upper optical machine 422 and the upper calibration paper 428 .

Taking color correction as an example, when the light source device 424 in the upper optical machine 422 emits light, the light is reflected by the upper calibration paper 428 fixed on the extension platform 426 of the lower optical machine 406, and then reflected by a plurality of reflectors 432, After being condensed by the lens 434, the light is received by the photoelectric sensing element 430 in the upper optical machine 422, and then converted into an analog electrical signal for processing. This analog electrical signal corresponding to the standard white on the upper calibration paper 428 is converted into a digital value corresponding to the standard white on the upper optical machine 422 .

Wherein, the photoelectric sensing element 430 can be a charge coupled device (Charge Coupled Device, CCD), a contact image sensor (Contact Image Sensor, CIS), or other sensing elements that can convert optical signals into electrical signals.

In FIG. 4 , since the upper calibration paper 428 is fixed on the extension platform 426 of the lower optical machine 406 , when the traction element 410 drives the lower optical machine 406 , the upper calibration paper 428 can also move along with the lower optical machine 406 . In this way, relative motion can be generated between the upper optical machine 422 and the upper calibration paper 428 in the automatic paper feeding device 416 , so that the upper optical machine 422 can scan multiple scanning lines on the upper calibration paper 428 . Each scanning line can correspond to a standard white digital value, and multiple scanning lines can correspond to multiple standard white digital values. After averaging the multiple standard white digit values, the average value of the standard white digit values with high accuracy can be obtained.

After the upper optical machine 422 finishes correcting the optical information, the pulling element 410 continues to move the lower optical machine 406 under the lower calibration paper 414 so that the lower optical machine 406 can correct the optical information.

Please refer to FIG. 5 , which is a schematic diagram of a scanner with double-sided scanning correction function according to the second embodiment of the present invention. The scanner 500 has a casing 502 on which a glass platform 504 for scanning documents (not shown in the figure) is placed. The casing 502 has a lower optical engine 506 inside, and a light source device 508 is disposed on the lower optical engine 506 . The scanner 500 uses the pulling element 510 to drive the lower optical machine 506 to move back and forth in the Y direction, and the connecting device 512 is used to connect the lower optical machine 506 and the pulling element 510 . The traction element 510 can drive the lower optical machine 506 to move under the lower calibration paper 514 for optical information calibration.

The scanner 500 equipped with an automatic document feeder 516 with an upper optical machine 522 has a duplex scanning function. In the automatic paper feeding device 516 , when the paper (not shown in the figure) is fed from the paper feeding frame 518 , the paper will be transported to the paper output frame 520 along the paper guide track (not shown in the figure). When the paper is conveyed in the paper guide track, the upper optical machine 522 in the automatic paper feeding device 516 can scan the first side of the paper, and the lower optical machine 506 can scan the second side of the paper. Wherein, the upper light engine 522 includes a light source device 524 .

Before the upper optical machine 522 scans the paper, the correction of the optical information must be completed first. In order to achieve the purpose of the present invention, the upper optical machine 522 and the upper calibration paper 528 must move relative to each other for optical information calibration. Therefore, the upper optical machine 522 can be movably installed in the automatic paper feeding device 516, and the upper calibration paper 428 is fixed in the scanner 500, such as on the glass platform 504, so that the upper optical machine 522 can be aligned with the upper calibration paper. The purpose of generating relative movement among the papers 528 . Wherein, the upper optical machine 522 is movable.

Furthermore, in FIG. 5 , in order to cause relative movement between the upper optical machine 522 in the automatic paper feeding device 516 and the upper calibration paper 528 fixed on the glass platform 504 , the upper optical machine 522 can be connected via a The device 534 is connected to the traction element 532 . The traction element 532 is used to drive the upper optical machine 522 so that the upper optical machine 522 can move back and forth in the Y direction. In this way, the upper optical machine 522 is driven by the traction element 532, so that the upper optical machine 522 can scan the fixed upper calibration paper 528 with multiple scanning lines to obtain the average value of the standard white digital value with high accuracy.

The upper optical machine 522 scans the upper calibration paper 528 for 50 scanning lines to obtain the average value of the standard white digital value as an example for illustration. If the resolution of the scanner is 600dpi (dot perinch), 50 scanning lines correspond to 50/600 inches. Therefore, under this condition, the traction element 532 only needs to achieve the purpose of moving the upper optical machine 522 by 50/600 inches. Therefore, although there is not much space in the automatic paper feeder 516, the automatic paper feeder 516 is equipped with a traction element 532 that can move the upper optical machine 522 for 50/600 inches and its corresponding transmission (not shown in the figure). ) is indeed feasible. Wherein, the transmission device is composed of, for example, a reduction gear set and a motor.

The advantage of the device of the present invention is that it has a double-sided scanning correction function, which can make the upper optical machine in the automatic paper feeding device perform multiple scanning lines on the upper correction paper to obtain the average value of the correction value. In this way, It can reduce the impact on the correction of optical information due to the stain quality of the correction paper, and improve the quality of the scanned image; in addition, the utility model can also cause relative movement between the upper optical machine and the upper correction paper in the automatic paper feeding device, The above effect can also be achieved.

Claims (4)

1. the scanner with duplex scanning calibration function comprises an automatic document feeder, it is characterized in that, described scanner comprises: a top ray machine is arranged in the described automatic document feeder; And before the one scan and between the ray machine of described top the upper correction paper of relative motion is arranged, be arranged at the below of described top ray machine.

2. scanner as claimed in claim 1 is characterized in that, described scanner also comprises: a shell; One is used to place the glass platform of a file to be scanned, is fixed on the described shell; Paper is proofreaied and correct in one bottom, is fixed on the described glass platform; And a bottom ray machine, be movably located on the inside of described shell.

3. scanner as claimed in claim 2 is characterized in that, also is provided with one on the ray machine of described bottom with extending and extends platform, and described upper correction paper is fixed on the described extension platform.

4. scanner as claimed in claim 2 is characterized in that, described upper correction paper is fixed on the described glass platform.

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