Capacitance sensor for coin evaluation
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United States of America Patent
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Jun 21, 2005
Issued Date -
N/A
app pub date -
Apr 10, 2000
filing date -
Jan 28, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A capacitance sensor measures a coin to determine geometrical parameters thereof and to allow assessment of different geometrical parameters of a coin which influence the measured capacitance. In a preferred arrangement, a mechanical arrangement alters the capacitance between two electrodes as a function of the diameter of the coin. This assessment is used in combination with a further measured capacitance which is a function of coin diameter, coin thickness and surface relief of the coin. The initial evaluation of diameter is useful in determining the separate influences of coin thickness and surface relief. The invention is also directed to the method of coin evaluation.
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