PAPER-LIKE SHEET DISCRIMINATOR FOR PERFORMING HIGHLY ACCURATE GENUINENESS/SPURIOUSNESS DISCRIMINATION

摘要

PURPOSE: A paper-like sheet discriminator for performing highly accurate genuineness/spuriousness discrimination is provided to reduce advantageously an installation area by providing the paper-like sheet discriminator having the compact size and making a paper conveyance path with the going and returning conveyance path. CONSTITUTION: A paper-like sheet discriminator includes a paper-like sheet thickness detection device(1-8,41-47) for detecting a thickness of a paper-like sheet(9). Wavelength components less than a specified wavelength are extracted from a thickness signal detected by the paper-like sheet thickness detection device. Appearance positions on the paper-like sheet are determined at which the extracted wavelength components are less than the specified wavelength and have amplitude not less than a constant value. The determined appearance positions are collated with stored appearance positions on the paper-like sheet in order to discriminate genuineness/spuriousness of the paper-like sheet.