Bill discriminating apparatus

Abstract

A bill discriminating apparatus having a light emitter for emitting light onto bills and two color detectors for selectively and photoelectrically detecting light components contained in light emitted from the light emitter and transmitted through or reflected by the bills to be discriminated and having different wavelengths, each being for outputting signals corresponding to a detected amount of the light component, the bill discriminating apparatus including two reference color detectors for selectively and photoelectrically detecting light contained in light emitted from the light emitter and having different wavelengths, each being for outputting signals corresponding to a detected amount of light, a correction value calculator for calculating a ratio of signals output from the two reference color detectors, a corrector for correcting the signals output from one of the two color detectors based upon signals output from the correction value calculator, a differential amplifier for differentially amplifying a difference between signals output from the corrector and the signals output from the other of the two color detectors, a divider for dividing signals output from the differential amplifier by the signals output from the other of the two color detectors and a discriminator for discriminating denominations and/or genuineness of the bills based upon signals output from the divider. The thus constituted apparatus makes it possible to discriminate denominations and/or genuineness of bills without fail.