OPTICAL SENSOR, IMAGE FORMING APPARATUS AND DETERMINATION METHOD
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United States of America Patent
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Issued Date -
Mar 7, 2013
app pub date -
Sep 5, 2012
filing date -
Sep 5, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An optical sensor includes a first illuminating system, a second illuminating system, a first regular reflected light detection system, a second regular reflected light detection system and so forth. The first illuminating system is disposed at the −X side of the opening in the dark box, and the second illuminating system is disposed at the +X side of the opening in the dark box. The first and second illuminating systems emit light to the opening. The incidence angles of irradiation light from the first and second illuminating systems relative to the surface of the stage are set equal to each other. The first regular reflected light detection system detects the light emitted from the first illuminating system and regularly reflected by the recording paper, and the second regular reflected light detection system detects the light emitted from the second illuminating system and regularly reflected by the recording paper.
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