METHOD AND DEVICE FOR CHECKING COINS,申请号HU19920003510-传众专利搜索

METHOD AND DEVICE FOR CHECKING COINS

申请公布号：HU9203510(D0)

申请号：HU19920003510

申请日期：1991.04.29

申请公布日期：1993.03.01

申请人：

MARS INC.,US

发明人：FURNEAUX,DAVID MICHAEL,GB

分类号：G07D5/08

主分类号：G07D5/08

摘要：PCT No. PCT/GB91/00680 Sec. 371 Date Nov. 6, 1992 Sec. 102(e) Date Nov. 6, 1992 PCT Filed Apr. 29, 1991 PCT Pub. No. WO91/17527 PCT Pub. Date Nov. 14, 1991.A method and apparatus for testing coins is described. In particular, the resistance introduced into a tuned circuit by the proximity of a coin while it is moving past an inductor of the circuit is determined by changing the amount of phase shift present in a feedback path associated with the circuit and measuring the resulting change in frequency of oscillation, which is dependent upon the resistance in the tune circuit.