| 摘要 |
A laser beam (LB) emitted from a laser diode (39) of each of detectors (60a, 60b) is applied to a partly cut region (27a, 27b) of a photosensitive sheet film (12) which is spread toward the detectors (60a, 60b) by a film bending roller (58). Part of the laser beam (LB) which is reflected from the partly cut region (27a, 27b) is detected by an amount-of-light sensor (45). The laser beam (LB) that is applied to a surface of the photosensitive sheet film (12) other than the partly cut region (27a, 27b) is reflected outside of a light-detecting area of the amount-of-light sensor (45), and is not detected by the amount-of-light sensor (45). ® KIPO & WIPO 2007
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