Surface reflectivity discriminating device
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United States of America Patent
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Nov 30, 2004
Grant Date -
Mar 25, 2004
app pub date -
Dec 10, 2002
filing date -
Sep 23, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and method for discriminating between plate and interleave paper in a CTP device having a cassette with printing plates and interleave paper. The device uses a light source for illuminating the topmost object in the cassette, a first optical sensor for receiving direct light reflected from the topmost object, a second optical sensor for receiving dispersed light reflected from the topmost object, means for comparing light received by the second optical sensor with light received by the first optical sensor, and means for determining the topmost object type based on the comparison.
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