Capacitance sensor for coin evaluation

Details Capacitance sensor for coin evaluation Capacitance sensor for coin evaluation

2005-06-21

2005-06-21

Walsh, Donald P. (Department: 3653)

Check-actuated control mechanisms

Including means to test validity of check

By testing material composition

C194S330000, C194S335000, C194S337000

Reexamination Certificate

active

06907977

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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