Optical path monitoring circuit for a document scanner
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United States of America Patent
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-
Oct 26, 1982
Grant Date -
N/A
app pub date -
Mar 11, 1981
filing date -
Mar 11, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The light levels reflected from a predetermined blank portion of an optically scanned document are monitored. The presence of dirt or smudges in the optical path which could adversely affect the validity of the information read from the document.
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Cited Art Landscape
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