| 摘要 |
PROBLEM TO BE SOLVED: To provide a detector for a translucent sheet body that can stably detect the presence or absence of the translucent sheet body, with high accuracy. SOLUTION: Light sources 100a-100c are set, in the way, that an incident angleθwith respect to a film F is 65 degree or larger, where light beams L emitted from the light sources 100a-100c are received by photoreceivers 102a-102c through the films F, and the received signals are then processed by a signal processing circuit 110. Then decision for the presence or the absence of the films F is made by a decision part 112 for presence or absence of the translucent sheet body. |
