| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a positive reflection image detection device for eliminating any unnecessary positive reflection and a paper sheet discrimination device on which the positive reflection image detection device is loaded. <P>SOLUTION: When a paper sheet 101 is conveyed to the direction of an arrow 102a as shown in the figure in parallel with a glass surface, the rays of light of an optical path 501 are positively reflected on the paper sheet 101, and made incident to a photoelectric sensor 305. Also, the rays of light of the optical path 502 are positively reflected on the paper sheet 307 conveyed with the top end faced upward, and the rays of light of the optical path 503 are positively reflected on the paper sheet 308 conveyed with the top end faced downward, and made incident to the photoelectric sensor 305. That is, even when the paper sheets 101 are conveyed so as to be relatively tilted, the positively reflected image is obtained from any virtual light source on a diffusion plate 302. Also, masks 507 and 508 through which any ray of light is not transmitted are disposed at specific positions on the diffusion plate 302 so that any unnecessary positive reflection from a glass 303 is prevented. When optical scaling factor is 1 time, the width of the mask may be equal to or more than the width of the light receiving sensor 305. <P>COPYRIGHT: (C)2009,JPO&INPIT |
