Patent ID: 6056105
Filing Date: 2000-05-02
Classification: G07D

Abstract:
A device for verifying a circular plate body comprising:a housing including a passage to pass a body falling in a direction therethrough;a first coil wrapped about the housing;a first oscillating circuit to energize the first coil to generate a first magnetic flux through said passage;first and second cores covering the first coil at each side of the passage;second and third coils wrapped about said first and second cores about axes parallel to said direction;a second oscillating circuit to energize the second and third coils to generate a second magnetic flux through said passage crossing said first magnetic flux, said body when falling through said passage crossing said magnetic fluxes;means for detecting the oscillation amplitudes of said first and second circuits in response to passage of the body through said passage and generating first and second signals in response thereto; anda processor including a memory structure storing data corresponding to said first and second signals for an authentic body, said processor adapted to compare said first and second signals to said stored data to verify the authenticity of the body.