COIN DETECTOR
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United States of America Patent
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Issued Date -
Mar 29, 2012
app pub date -
Dec 1, 2011
filing date -
Feb 1, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A coin detector includes an oscillator circuit using an oscillator for generating a magnetizing signal of a predetermined oscillation frequency and an eddy current sensor for producing an AC magnetic field for sensing the variation of the inductance of an eddy current produced upon passing of a coin, a FM demodulator and an AM demodulator respectively electrically coupled to the oscillator circuit by a respective buffer for demodulating the voltage frequency and voltage amplitude of the oscillation signal outputted by the oscillator circuit, and a recognition logic unit for computing the demodulated FM signal outputted by the FM demodulator and the demodulated AM signal outputted by the AM demodulator by means of using time as a parameter to recognize the authenticity and value of the sensed coin.
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