# US 7,466,457 B2 · Sheet-fed scanner capable of scanning multiple scan lines for image signal calibration > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,466,457 B2 - Document ID: US7466457B2 - Status: Granted - Kind: B2 - Application number: 11/414,450 - Filed: 2006-05-01 - Published: 2006-11-09 - Granted: 2008-12-16 - Earliest claimed: 2005-05-04 - Assignees: Avision Inc. - Inventors: Ku Ming Chen - Web page: https://patentgrep.com/patent/US7466457B2 ## CPC - H04N 1/12: using the sheet-feed movement {or the medium-advance or the drum-rotation movement} as the slow scanning component, {e.g. arrangements for the main-scanning}({sheet-feed movement by translatory movement of a flat picture-bearing surface H04N1/1008; main-scanning using oscillating or rotating mirrors H04N1/113; } using multi-element arrays H04N1/19) - H04N 1/00018: {Scanning arrangements} - H04N 1/00045: {using a reference pattern designed for the purpose, e.g. a test chart} - H04N 1/191: the array comprising a one-dimensional [1D] array - H04N 1/193: using electrically scanned linear arrays {, e.g. linear CCD arrays} - H04N 2201/044: Moving a scanning element into cooperation with a calibration element, e.g. a grey-wedge mounted on the document support, or vice versa - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A sheet-fed scanner capable of scanning multiple scan lines for image signal calibration includes a housing, a sheet-feeding mechanism, a first scanning module, a first actuator and a first calibration sheet. The sheet-feeding mechanism disposed in the housing feeds a document across a scan region. The first scanning module rotatably mounted in the housing scans a front side of the document fed across the scan region. The first calibration sheet is fixed in the housing and disposed in the scan region. The first actuator drives the first scanning module to rotate such that the first scanning module senses a plurality of scan lines on the first calibration sheet to obtain a first calibration standard for calibrating a first image signal of the front side of the document. Thus, it is possible to avert any flaws in image quality caused by the contaminated calibration sheet. ## Claims ### Claim 1 A sheet-fed scanner, comprising: a housing; a sheet-feeding mechanism, which is disposed in the housing, for feeding a document across a scan region; a first scanning module, which is rotatably mounted in the housing, for scanning a front side of the document fed across the scan region; a first actuator for driving the first scanning module to move; and a first calibration sheet fixed in the housing and disposed in the scan region, wherein the first actuator drives the first scanning module to move such that the first scanning module senses a plurality of scan lines of the first calibration sheet to obtain a first calibration standard for calibrating a first image signal obtained after the first scanning module subsequently senses the front side of the document, and the scan lines are not parallel to one another or to each other. ### Claim 2 (depends on 1) The scanner according to claim 1, wherein the first calibration sheet has a level surface. ### Claim 3 (depends on 1) The scanner according to claim 1, wherein the first calibration sheet has an arc shape. ### Claim 4 (depends on 1) The scanner according to claim 1, wherein the first actuator is composed of a power source and a cam. ### Claim 5 (depends on 4) The scanner according to claim 4, wherein the power source is a motor. ### Claim 6 (depends on 1) The scanner according to claim 1, wherein the first actuator is made of a piezoelectric material, which deforms to drive the first scanning module to rotate when a voltage is applied to the piezoelectric material. ### Claim 7 (depends on 1) The scanner according to claim 1, wherein the first actuator is made of a bimetal material, which deforms to drive the first scanning module to rotate when a voltage is applied to the bimetal material to generate a current flowing through the bimetal material. ### Claim 8 (depends on 1) The scanner according to claim 1, wherein the first scanning module comprises a first image sensor, a first lens, at least one first reflecting mirror and a first light source. ### Claim 9 (depends on 1) The scanner according to claim 1, wherein the first scanning module is a contact image sensor (CIS) scanning module. ### Claim 10 (depends on 1) The scanner according to claim 1, further comprising: a second scanning module, which is rotatably mounted in the housing and opposite to the first scanning module, for scanning a back side of the document fed across the scan region; a second actuator for driving the second scanning module to rotate; and a second calibration sheet fixed in the housing and disposed in the scan region, wherein the second actuator drives the second scanning module to rotate such that the second scanning module senses a plurality of scan lines on the second calibration sheet to obtain a second calibration standard for calibrating a second image signal obtained after the second scanning module subsequently senses the back side of the document. ### Claim 11 (depends on 10) The scanner according to claim 10, wherein the second scanning module comprises a second image sensor, a second lens, at least one second reflecting mirror and a second light source. ### Claim 12 (depends on 10) The scanner according to claim 10, wherein the second scanning module is a contact image sensor (CIS) scanning module.