Coin discrimination apparatus with compensation for external ambient conditions
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United States of America Patent
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Oct 27, 1992
Grant Date -
N/A
app pub date -
May 18, 1990
filing date -
May 26, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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