Coin validator

Details Coin validator Coin validator

1989-05-19

1990-08-28

Bartuska, F. J.

Check-actuated control mechanisms

Including means to test validity of check

By testing material composition

194328, G07D 508

Patent

active

049518003

ABSTRACT:
A coin validator for discerning a thickness or a pattern of a coin in a non-contact manner. When the coin passes through a coin path, a coin sensor senses the passage of the coin to cause a change in a resonant frequency of a resonator and hence to fluctuate a resonant output voltage. The thickness and pattern of the coin are detected in accordance with that fluctuation. The resonator has a variable capacitance diode added thereto as a resonant element. If the resonant frequency of the resonator deviates out of a reference resonant frequency range, a voltage corresponding to the deviation is applied across the variable capacitance diode to provide feedback control such that the resonant frequency returns within the reference resonant frequency range.

REFERENCES:
patent: 3506103 (1970-04-01), Kuckens et al.
patent: 4334604 (1982-06-01), Davies
patent: 4846332 (1989-07-01), Quinlan

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