Coin detecting apparatus for distinguishing genuine coins from s

Details Coin detecting apparatus for distinguishing genuine coins from s Coin detecting apparatus for distinguishing genuine coins from s

1979-03-15

1982-06-15

Spar, Robert J.

Check-actuated control mechanisms

Including noncontacting, relatively movable parts connected...

73163, G07F 302

Patent

active

043346049

ABSTRACT:
A coin, spurious coin and the like is passed in close proximity with the inductance of the resonant tank circuit of an oscillator and varies the losses of the tank circuit and thereby the amplitude of a signal produced by the oscillator in accordance with the metal content of the coin, and the like. The signal produced by the oscillator is converted to a control signal having an amplitude which when in a predetermined range indicates an acceptable coin and which when outside the range indicates a rejectable spurious coin, and the like. After passing the inductance, the coin is selectively directed to an accepted location or a rejected location in accordance with the amplitude of the control signal. A passive resonant circuit is also provided in close proximity to but electrically unconnected to the resonant tank circuit for sensing the dimensions of the coin.

REFERENCES:
patent: 2642974 (1953-06-01), Ogle
patent: 3317016 (1967-05-01), Turillon
patent: 3453532 (1969-07-01), Gardiner
patent: 3587809 (1971-06-01), Meloni
patent: 3901368 (1975-08-01), Klinger
patent: 3956692 (1976-05-01), Weinberg
patent: 4105105 (1978-08-01), Braum
patent: 4108296 (1978-08-01), Hayashi et al.
patent: 4151904 (1979-05-01), Levasseur et al.
Electrical Fundamentals for Technicians, 2nd edition, Robert L. Schrader, pp. 405 to 413.

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