Reflective optical sensor for bill validator
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United States of America Patent
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-
Sep 18, 2007
Grant Date -
Jun 16, 2005
app pub date -
Dec 13, 2004
filing date -
Dec 12, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A simple high optical efficiency reflective optical sensor for bill validator uses an inexpensive bulb having a case which is transparent to efficient luminous radiation. This case is used as a wave guide to return reflected radiation to at least one photo detector situated directly under the transparent bottom of the case. The bulb emits a narrow beam of light and is positioned in close proximity and perpendicular to a bill surface and illuminates it. The light reflected or fluoresced by the bill is collected widely with a convex lens end of the bulb case and this collected radiation is transmitted through the bulb case to the at least one photo detector. Preferably, the bulb is a light emitting diode.
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