# US 2011/0032580 A1 · Scanning device and scanning method thereof

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- Number: US 2011/0032580 A1
- Document ID: US20110032580A1
- Status: Published application
- Kind: A1
- Application number: 12/814,480
- Filed: 2010-06-13
- Published: 2011-02-10
- Earliest claimed: 2009-08-07
- Assignees: QISDA (SUZHOU) CO., Ltd.
- Inventors: Yong-Xiang Yi
- Web page: https://patentgrep.com/patent/US20110032580A1

## CPC

- H04N 1/1215: {Feeding using one or more cylindrical platens or rollers in the immediate vicinity of the main scanning line}
- H04N 1/00002: {Diagnosis, testing or measuring; Detecting, analysing or monitoring not otherwise provided for (error detection, error correction or monitoring in digital computers or digital computer components G06F11/00)}
- H04N 1/00013: {Reading apparatus}
- H04N 1/00023: {Colour systems}
- H04N 1/00034: {Measuring, i.e. determining a quantity by comparison with a standard (H04N1/00031 takes precedence)}
- H04N 1/00045: {using a reference pattern designed for the purpose, e.g. a test chart}
- H04N 1/0005: {in service, i.e. during normal operation}
- H04N 1/00055: {automatically on a periodic basis}
- H04N 1/00063: {using at least a part of the apparatus itself, e.g. self-testing}
- H04N 1/00087: {Setting or calibrating (picture signal circuits H04N1/40)}
- H04N 1/02835: {in combination with a light guide, e.g. optical fibre, glass plate (light-guides per se G02B6/00)}
- H04N 1/125: {the sheet feeding apparatus serving an auxiliary function, e.g. as a white reference}
- H04N 1/193: using electrically scanned linear arrays {, e.g. linear CCD arrays}
- H04N 2201/0081: Image reader (H04N2201/0091 - H04N2201/0094 take precedence)
- H04N 2201/0096: Portable devices
- H04N 2201/03112: Light source
- H04N 2201/03125: Light guide upstream of the scanned picture elements
- H04N 2201/03141: Photodetector lens
- H04N 2201/03145: Photodetector
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A scanning device and a scanning method thereof are provided. The scanning device includes a scanning group, a paper-feed roller and a calibration portion. The scanning group includes a line light source generating module and a scanning module. The line light source generating module includes a point light source, a light-guiding plate and a casing. The light emitted by the point light source along a first direction is converted into a line light source through a light-guiding plate disposed in the casing. The light emitted by the line light source along a second direction is emitted from an opening of the casing. The scanning module, along the first direction, includes a scan document region and a calibration region. The light reflected through the to-be-scanned document is received in the scan document region. The calibration portion disposed on the casing or the paper-feed roller corresponds to the calibration region.

## Claims

### Claim 1

A scanning device, comprising:
a scanning group comprising a line light source generating module and a scanning module, wherein the line light source generating module comprises a point light source, a light-guiding plate and a casing, a light emitted by the point light source along a first direction is converted into a line light source through the light-guiding plate disposed in the casing, the light emitted by the line light source along a second direction is emitted from an opening of the casing, the scanning module comprises a scan document region and a calibration region along the first direction, and the light reflected through a to-be-scanned document is received in the scan document region;
a paper-feed roller disposed adjacent to the scanning group for driving the to-be-scanned document;
a calibration portion disposed on the casing or the paper-feed roller, wherein the calibration portion corresponds to the calibration region of the scanning module and the reflected light is received in the calibration region through the calibration portion.

### Claim 2 (depends on 1)

The scanning device according to claim 1, wherein the calibration portion is a reflection layer disposed around the paper-feed roller.

### Claim 3 (depends on 1)

The scanning device according to claim 1, wherein the calibration portion and the casing are integrally formed in one piece.

### Claim 4 (depends on 1)

The scanning device according to claim 1, further comprising:
a light source control circuit for controlling the illumination parameters of the line light source generating module;
a calibration control system electrically connected to the scanning module and the light source control circuit for adjusting the light source control circuit according to the signal feedbacked from the calibration region.

### Claim 5 (depends on 1)

The scanning device according to claim 1, wherein the point light source is red/green/blue (RGB) light emitting diodes (LEDs).

### Claim 6 (depends on 1)

The scanning device according to claim 1, wherein the scanning module comprises a cylindrical lens array and a CIS array, and the reflected light is received by the CIS array through the cylindrical lens array.

### Claim 7

A scanning method, comprising the following steps:
A. providing a calibration portion corresponding to a calibration region of a scanning module;
B. pre-scanning a document, wherein a light emitted by a light source is reflected through the calibration portion and received in the calibration region, and, at the same time, a first brightness signal is generated;
C. comparing the first brightness signal to a pre-determined signal;
D. adjusting the light source and repeating the step B if a difference between the first brightness signal and the pre-determined signal is greater than a reference value;
E. formally scanning the document if the difference between the first brightness signal and the pre-determined signal is smaller than or equal to the reference value.

### Claim 8 (depends on 7)

The scanning method according to claim 7, wherein the scanning module further comprises a scan document region along the first direction, and the light emitted by the light source is reflected through a to-be-scanned document and received in the scan document region.

### Claim 9 (depends on 7)

The scanning method according to claim 7, wherein before the step B, a brightness or an exposure time of the light source is pre-determined.

### Claim 10 (depends on 7)

The scanning method according to claim 7, wherein in the step D, an exposure time of the light source is increased or decreased.