Coin discriminating device and method, and a coin handling machine including such a device and method
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United States of America Patent
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Feb 17, 2009
Grant Date -
Jul 8, 2004
app pub date -
Sep 22, 2003
filing date -
Mar 22, 2001
priority date (Note) -
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Abstract
A coin discriminating device has a sensor electrode and an oscillator. The oscillator is coupled to the sensor electrode. The oscillator generates an output signal with a frequency which is capacitively controllable. A frequency detector detects a frequency deviation in the oscillator output signal, caused by a variation in capacitance at the sensor electrode when a coin is positioned in the vicinity of the sensor electrode. A processing device determines the thickness of the coin from the frequency deviation. The coin discriminating device is arranged such that the variation in capacitance occurs between the sensor electrode and a surface of the coin.
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