Patent ID: 7391538

Claim:
A sheet-fed scanner capable of scanning multiple scan lines for image signal calibration, the sheet-fed scanner comprising: a housing; a sheet-feeding mechanism for feeding a document across a scan region; a first scanning module, which is fixed in the housing, for scanning a front side of the document, wherein the first scanning module comprises a first image sensor, a first lens and at least one first reflecting mirror; a first actuator for actuating the at least one first reflecting mirror; and a first calibration sheet fixed in the housing and located in the scan region, wherein the first actuator actuates the at least one first reflecting mirror such that the first image sensor senses a plurality of scan lines of the first calibration sheet through the first lens and the at least one first reflecting mirror, as a calibration standard for first image signal obtained when the first image sensor senses the front side of the document, wherein the at least one first reflecting mirror is placed on a base having two projections in contact with a lower surface of the at least one first reflecting mirror and an elastic member presses against an upper surface of the at least one first reflecting mirror, such that when the first actuator pushes a side of the at least one first reflecting mirror upwards, the at least one first reflecting mirror parts from one of the projections and the at least one first reflecting mirror is rotated.