Sheet-through type document reader
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United States of America Patent
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May 13, 2003
Grant Date -
N/A
app pub date -
Nov 17, 1999
filing date -
Dec 25, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A sheet-through document reader for reading an image formed on a surface of a document original being transported through a reading position. The document reader includes: a reading mechanism for performing main scanning to scan the surface of the document original in a direction perpendicular to a document transport direction at the reading position thereby to read an optical image of the document original, and converting the optical image into image signals; an abnormal value detection circuit for determining whether or not any abnormal value is present in image signals obtained by performing the main scanning by means of the reading mechanism, for example, before the document is read; and a reading position shifting mechanism for shifting the reading position in the document transport direction when the abnormal value detection circuit detects an abnormal value.
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