Method and apparatus for discriminating different coins in free fall
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United States of America Patent
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Aug 8, 2000
Issued Date -
N/A
app pub date -
Oct 19, 1998
filing date -
Sep 30, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for identifying a coin in free fall employs a coin sensor that has a pair of drive coils for generating a horizontally elongated magnetic field across a free-fall path of the coin. The drive coils are driven by a square wave, and ringing waveforms induced in a pair of sensor coils disposed on the two sides of the free-fall path are measured when the coin passes through the magnetic field. A digitized signature is derived from the measured ringing waveforms and compared to a set of pre-stored reference signatures to find a match. A diverter mechanism directs the coin to an accept path when a match is found and to a reject path when a match is not found.
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