Device for authenticating authenticity of paper sheet and method for determining authenticity of paper sheet

摘要

It is an object to realize strict bill discrimination while suppressing cost by simplifying the sensor configuration. Using a line sensor (120) for irradiating excitation light to a banknote having characteristics of emitting phosphorescence by irradiation with excitation light and detecting afterglow of phosphorescence emitted from the banknote and transmitted light from the banknote , The lighting-time image data (132) acquired during the excitation light irradiation, the afterglow intensity image data (134) generated based on the afterglow intensity after the excitation light is turned off, and the afterglow intensity after the excitation light is turned off The afterglow attenuation factor image data (135) generated on the basis of the attenuation factor, the lighting time reference image corresponding to the genuine note stored in advance, the afterglow intensity reference image, the afterglow attenuation rate reference image To evaluate the authenticity of the banknote.