Motion sensor for flat objects
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United States of America Patent
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Apr 20, 2004
Grant Date -
Jan 22, 2004
app pub date -
Jul 10, 2002
filing date -
Jun 20, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A simple method and apparatus for contactless rapid and inexpensive motion checking of flat objects, preferably of currency papers. The objects need not be identical in size, thickness, surface appearance, configuration nor deterioration. The checking is carried out by detecting of airflow oscillation under unexpected stoppage of testing object or air movement around the object especially on its front and back edges.
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