Patent ID: 7305113
Filing Date: 2007-12-04
Classification: G07D

Abstract:
1. A paper-like sheet discriminator having a paper-like sheet thickness detection device for detecting a thickness of a paper-like sheet on paper-like sheet conveyance along the total length of said paper-like sheet, said paper-like sheet discriminator comprising: wavelength extracting means for extracting signal waveform with less than a specified wavelength from a thickness signal detected by said paper-like sheet thickness detection device, appearance positions extracting means for extracting appearance positions at which amplitude of the signal waveform extracted by the wavelength extracting means has amplitude not less than a constant value appear, collating means for collating the thus determined appearance positions by the said appearance position extracting means with precedently stored appearance positions on said paper-like sheet at which the amplitude of the signal waveform with less than said specified wavelength has the amplitude not less than the constant value appear, and judging means to judge genuineness/spuriousness of said paper-like sheet, wherein said judging means judge whether or not the appearance positions extracted by said appearance positions extracting means with the appearance positions on said paper-like sheet at which the amplitude of the signal waveform with less than said specified wavelength has the amplitude not less than the constant value appear so as to discriminate genuineness/spuriousness of said paper-like sheet.