| 摘要 |
A laser beam (LB) emitted from a laser diobe of each of detectors is applied to a partly cut region of a photosensitive sheet film which is spread toward the detectors by a film bending roller. Part of the laser beam (LB) which is reflected from the partly cut region is detected by an amount-of-light sensor. The laser beam (LB) that is applied to a surface of the photosensitive sheet film other than the partly cut region is reflected outside of a light-detecting area of the amount-of light sensor, and is not detected by the amount-of-light sensor.
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