Patent ID: 6967749
Filing Date: 2005-11-22
Classification: H04N

Abstract:
1. A duplex scanner capable of calibrating a two-sided document, comprising: an automatic document feeder; an upper carriage installed in the automatic document feeder; an upper calibration paper installed under the upper carriage; a case; a transparent platen fixed on the case for receiving a to-be-scanned document; a lower calibration paper fixed to the transparent platen; and a lower carriage installed inside the case, the lower carriage having an extending board for attaching the upper calibration paper, and the upper calibration paper simultaneously moving with the lower carriage along the same direction; wherein the upper calibration paper is moved under the upper carriage by moving the lower carriage, so that the upper carriage is capable of scanning a plurality of scan lines on the upper calibration paper for calibrating the light beam information before image scanning.