Patent ID: 6529269
Filing Date: 2003-03-04
Classification: G07D

Abstract:
A device for identifying paper sheets, comprising:a carrying unit which conveys a paper sheet along a predetermined path; a radiation unit, provided near said carrying unit and having a switching unit which selectively operates at least two lights having different wavelengths and a light source thereof, the radiation unit sequentially radiating the light from said light source onto the paper sheet being conveyed on said carrying unit; a signal producing unit which converts light permeated through or light reflected from said paper sheet to a signal, the light having been detected after being radiated onto said paper sheet by said radiation unit; a change detection unit which codes a change in direction of the strength of the signal from said signal producing unit, and produces detected data therefrom; and a determination unit which has predetermined reference data, and determines the authenticity of the paper sheet by comparing the detected data from said change detection unit with said reference data.