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Method of discriminating coins

  • US 4,989,714 A
  • Filed: 11/13/1989
  • Issued: 02/05/1991
  • Est. Priority Date: 11/15/1988
  • Status: Expired due to Term
First Claim
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1. A method of discriminating coins by use of a pair of oval sensor coils opposedly arranged at both sides of a coin passage in a coin acceptor with the longitudinal axis of the coils extended along a coin guide rail in the coin passage, the method comprising steps of detecting a variation of coil reactance caused by a coin rolling on the guide rail, counting clock pulses in a pass time from a start point to a final point of the variation of coil reactance, reading the whole variation of the coil reactance from the start point to the final point thereof by a microcomputer, providing a plurality of variation divided data by dividing the pass time by an integral number and comparing the variation data with corresponding reference data of a genuine coin previously stored in the microcomputer.

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