Patent ID: 6851541
Filing Date: 2005-02-08
Classification: G07D

Abstract:
1. A coin discriminator for a coin containing a first portion and a second portion made of at least one of different metals, metal alloys and combinations thereof, said coin discriminator comprising: (a) a coin path along which said coin is arranged to pass; (b) a coil means positioned adjacent said coin path; (c) electrical means electrically connected to said coil means for supplying time varying drive signals to said coil means; and (d) detection means disposed in a position for detecting eddy currents induced in said coin by said coil means, said coil means being arranged to induce in said coin an eddy current loop, which in a predetermined region of the coin crosses a bond between the first and second portions of said coin, said coil means includes a first and a second coil frame, wherein said first and said second coil frame has an essentially semicircular sectional shape, and said first and said second coil frame are symmetrically arranged at either side of a coil center plane situated between said coil means.