Method and apparatus for measuring the diameter of coins
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United States of America Patent
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-
Sep 12, 2006
Grant Date -
Feb 20, 2003
app pub date -
Jul 31, 2002
filing date -
Aug 16, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for measuring the diameter of coins in coin validators, comprising the steps below: The coins traverse an electromagnetic field which is formed such as to partially hide the field, at least also by their upper area. The field is generated between at least one transmitter coil and a receiver coil. The transmitter coil is periodically acted on by a short transmission pulse the duration of which is small as compared to the time of coin passage. The maximal attenuation values are determined for different times of the transmission pulse. The attenuation values measured are extrapolated into time 0. The measured value determined by extrapolation is compared to a predetermined acceptance band or a predetermined characteristic line for coin diameters for comparison to a stored setting.
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