Patent ID: 6068102
Filing Date: 2000-05-30
Classification: G07D

Abstract:
A coin identification device for detecting a change in magnetic field due to eddy currents produced in a coin and identifying the coin on the basis of the detected change, said coin identification device comprising:(a) a path along which the coin moves;(b) a sensor including:two coils juxtaposed at a predetermined interval along said path and disposed such that a central axis of each of said two coils is in line with a direction perpendicular to an obverse or reverse of the coin moving along said path; andtwo magnetic impedance elements disposed respectively within said two coils to extend along the central axes of said two coils; and(c) an identification circuit for outputting an identification signal for identification of the coin by differentially amplifying outputs of said two magnetic impedance elements, wherein each of an interval between said two coils and an interval between said two magnetic impedance elements is within a range from 3 mm to 6 mm.