Patent 7142334 was granted and assigned to Keba Group on November, 2006 by the United States Patent and Trademark Office.
The invention relates to a reading unit (1) for a document (2) having a control and/or evaluation device (44), incorporating a scanner device (25) for reading the document (2), and a guide mechanism (6) for the document (2) and a conveyor device (17) to effect a relative displacement between document (2) and scanner device (25). The control and/or evaluation device (44) cooperates with a compensating device (39) containing corrective values to correct the image signals (37) emitted by an optoelectric transducer (34) of the scanner device (25) in real time.