| 摘要 |
PROBLEM TO BE SOLVED: To reduce cost, by reducing the number of sensors, by accurately discriminating the existence of a mark, only by adjusting the quantity of light, before carrying a film. SOLUTION: A reference level for adjusting an irradiated light level of a light emitting element 10 by a stopping time light quantity control part 8, is set to a level higher by a significant difference than a mark detecting threshold value level. A carrying time light quantity control part 9 is arranged so that a light receiving level does not exceed the reference level by lowering the irradiated light level of the light emitting element 10, when a level of the light received by a light receiving element 6 exceeds this reference level, when the film 1 is put in a carrying state. Such a constitution can surely detect the existence of the mark, regardless of whether or not to be a place printed with the mark in stopping. COPYRIGHT: (C)2008,JPO&INPIT
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