Coin validating apparatus and method
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United States of America Patent
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Jun 26, 1990
Grant Date -
N/A
app pub date -
Oct 11, 1988
filing date -
Oct 11, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and method for evaluating a conductive coin to verify its authenticity and to determine its denomination. A first oscillator circuit generates a first oscillating signal for energizing a first coil producing a first magnetic field. The first oscillating signal has a first parameter which is a function of disturbances in the first magnetic field when the coin to be evaluated is located within the first magnetic field. A second oscillator circuit generates a second oscillating signal for energizing a second coil producing a second magnetic field. The second oscillating signal has a second parameter which is a function of disturbances in the second magnetic field when the coin to be evaluated is located within the second magnetic field. The parameters are converted to digital signals and provided to a computer which indicates the acceptability and denomination of the coin when a ratio or other arithmetic relationship of the first and second parameters is within an acceptable range.
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