| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for discriminating paper sheets which is small in shape, low in cost and can discriminate the paper sheets precisely, and to provide a method therefor. SOLUTION: This device is provided with: a light source 2 for irradiating the paper sheet 1 with illuminating lights L; diffraction grating 3 for dispersing reflected light rays R1 and R2 reflected at different angles; four light receiving elements 21 to 24 for outputting electric signals corresponding to the strength of detected lights (dispersed light rays D1 to D4) received through the diffraction grating 3; and an arithmetic processing unit 20 connected to the respective light receiving elements 21 to 24. Also, the paper sheet 1 is conveyed to a predetermined direction to a light source 2. The arithmetic processing unit 20 is configured to calculate the intensity rate of the light rays whose wavelength approximate to each other based on an electric signals in proportion to light quantity P1 to P4 outputted from the two sets of light receiving elements 21, 22 and 23, 24 to discriminate the authenticity of the paper sheet 1 having a color changing part 10. COPYRIGHT: (C)2005,JPO&NCIPI
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