Inductive coin validation system and payphone using such system
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United States of America Patent
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Mar 25, 2003
Grant Date -
N/A
app pub date -
Jan 14, 2000
filing date -
Nov 19, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A coin validation arrangement, usable for example in pay telephones, uses one or more inductive sensors having a small effective magnetic field so that the inductive sensor responds only to the material of a strip across the coin. Preferably a plurality of inductive sensors are used, mounted at different heights above the floor of a coin guide, at different positions along the coin path. At each position along the coin path there may be either one or a plurality of inductive sensors. Preferably the inductive sensors are surface mount inductors on a printed circuit board which forms part of one wall of the coin guide. Such arrangements are particularly useful for recognizing coins having an outer ring made of a different material from the central disc, and for distinguishing such coins from uniform composition coins.
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