Check-actuated control mechanisms – Including means to test validity of check – By testing material composition
Patent
1990-05-18
1992-10-27
Bartuska, F. J.
Check-actuated control mechanisms
Including means to test validity of check
By testing material composition
194317, 324225, 324227, G07D 508
Patent
active
051581663
ABSTRACT:
A coin validator includes improved compensation circuitry for compensating for ambient conditions such as temperature or the presence of metallic objects, includes a path (1) for passage for coins under test, sensor coils (2, 3, 4) which form an inductive coupling with coins under test during their passage along the path, detectors (DM1, ADC) responsive to the impedance presented by the coil in the absence of a coin, for producing an ambient condition signal which is a function of an ambient condition such as temperature of the presence of metallic objects a controller (MPU 17) responsive to the inductive coupling between a coin travelling along the path past the coil, for providing signal which is a function of a characteristic of the coin, and a microprocessor (MPU) for modifying operation of the controller in dependence upon the ambient condition signal.
REFERENCES:
patent: 4538719 (1985-09-01), Gray et al.
patent: 4754862 (1988-07-01), Rawicz-Szczerbo et al.
Bartuska F. J.
Coin Controls Limited
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