Patent ID: 8973730
Filing Date: 2015-03-10
Classification: G07D

Abstract:
1. A paper sheet processing apparatus comprising: an insertion slot into which a paper sheet is inserted; a sensor which detects insertion of the paper sheet from the insertion slot; a traveling route in which the paper sheet inserted from the insertion slot is conveyed; a first light emitting part which is disposed on an upper side of the traveling route and irradiates an upper side of the paper sheet to be conveyed with light; a second light emitting part which is disposed on a lower side of the traveling route and irradiates a lower side of the paper sheet to be conveyed with light; a light receiving part which receives light that is transmitted through the paper sheet by the first light emitting part and light that is reflected from the paper sheet by the second light emitting part; a black calibration part which sets a reference value for lowest brightness of light with respect to light received by the light receiving part in a state where emission by the light emitting part is made ineffective; an authenticity judgment processing part which judges an authenticity of the paper sheet by comparing a plurality of pixel data obtained by converting the lights received by the light receiving part into data per unit pixel having a predetermined size and including color information having brightness as the first and second light emitting parts irradiate the paper sheet traveling in the traveling route with the lights with reference pixel data with respect to a legitimate paper sheet based on the reference value set by the black calibration part; and a multi-feed judging part which judges whether the paper sheet having been inserted into the insertion slot is in an overlapped condition based on a comparison result between predetermined brightness and brightness of the converted plurality of pixel data after setting of the reference value is executed, wherein the black calibration part can set the reference value before the authenticity judgment processing part judges the authenticity after the sensor detects the insertion of the paper sheet every time when the paper sheet is inserted, and wherein after the paper sheet is read for a predetermined distance, the multi-feed judging part calculates a total density value of the converted plurality of pixel data in an leading end area of the read paper sheet and compares the total density value with a density value of the reference pixel data in a same area as the leading end area, to determine whether the paper sheet having been inserted into the insertion slot is in the overlapped condition based on a predetermined threshold.