Coin validator
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United States of America Patent
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-
Jun 4, 2002
Grant Date -
N/A
app pub date -
Oct 5, 1999
filing date -
Feb 24, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An oval-shaped sensor is used to measure the material content of the outer ring of a bicolour coin, the coil being mounted on a ferrite whose inner portion has a diameter which is wider than the inner disc of the bicolour coin so that eddy currents are confined to the outer ring. A thickness sensor may be mounted within the oval sensor, and a separate coil is used for measuring the material content of the inner disc. The thickness sensor may also be used for measuring material down to a different depth, for validating clad coins. The oval sensor is used also for diameter measurement.
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