Method and apparatus for plural document detection
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United States of America Patent
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-
Apr 3, 2001
Grant Date -
N/A
app pub date -
Mar 8, 1999
filing date -
Mar 8, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The presence of overlapped sheets on a paper transport is detected by employing such sheets as an acoustic interference filter. A beam of ultrasonic energy of appropriate frequency, angularly oriented to the planar transport path, will be attenuated to a much greater extent than the attenuation calculated based on the attenuation of a single sheet, as a result of destructive combining of wavefronts reflected from the facing surfaces of the overlapped sheets.
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