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Coin discrimination method

  • US 5,568,854 A
  • Filed: 10/04/1994
  • Issued: 10/29/1996
  • Est. Priority Date: 06/28/1991
  • Status: Expired due to Term
First Claim
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1. A coin detection method comprising the steps of:

  • establishing a magnetic flux across a coin path by providing an oscillating signal;

    passing a coin under test along the path;

    detecting the change in energy loss caused by the movement of the coin under test along the path;

    utilizing the change for the detection of an amplitude characteristic of the coin under test;

    determining the change of the amplitude characteristic with time of the coin under test;

    storing into memory a statistical variable determined from measurements of the amplitude-time characteristics of a plurality of coins of the same type as the coin under test;

    determining for the coin under test a deviation value in relation to the stored statistical variable; and

    providing a signal indicating acceptability of the coin under test if the deviation value is within a predetermined acceptable range.

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