Coin discrimination system

Details Coin discrimination system Coin discrimination system

1996-12-19

1998-09-15

Bartuska, F. J.

Check-actuated control mechanisms

Including means to test validity of check

By testing material composition

G07D 508

Patent

active

058066519

ABSTRACT:
A coin-sensing system wherein at least two sensor coils are electrically connected in series and physically arranged so that a coin deposited into the apparatus may pass sequentially through each sensor coil and thereby change the impedance of the coil. A sensor oscillator circuit incorporates the sensor coils to output an oscillating sensor signal at a frequency dependent on the impedance of the sensor coils. Counters measure the frequency of the sensor signal to obtain a frequency signature for the deposited coin which can be compared with frequency signatures of valid coins. The oscillator circuit may produce a lower frequency oscillating sensor signal or a higher frequency oscillating sensor signal and electronic switches are included in the circuit for switching from one of the frequency levels to the other after the deposited coin encounters a first sensor coil and before the deposited coin encounters a second sensor coil.

REFERENCES:
patent: 4705154 (1987-11-01), Masho et al.
patent: 4754862 (1988-07-01), Rawicz-Szczerbo et al.
patent: 5180046 (1993-01-01), Hutton et al.
patent: 5244070 (1993-09-01), Carmen et al.
patent: 5353906 (1994-10-01), Takami et al.

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