Foreign object detecting apparatus in a bill passageway
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United States of America Patent
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Jun 19, 2012
Grant Date -
Oct 28, 2010
app pub date -
Jun 9, 2009
filing date -
Apr 28, 2009
priority date (Note) -
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Abstract
A foreign object detecting apparatus in bill passageway includes a laser light source, a first light detector and a second light detector. The laser light source is arranged in a first lateral side to emit a coherent laser beam toward a second lateral side. The first light detector is arranged in the second lateral side to receive the coherent laser beam and to measure the intensity of the coherent laser beam. The second light detector is arranged in one of a top side and a bottom side, wherein when a foreign object is presence in the bill passageway, the intensity of the coherent laser beam received by the first light detector is decreased by the blocking of the foreign object, and at least a portion of the coherent laser beam which is reflected, refracted, diffracted or scattered by the foreign object is received by the second light detector.
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