| 摘要 |
PURPOSE:To enable detection of the position of a traveling image-recording transparent film with a photosensor using IR rays by attaching, to its surface, a film capable of transmitting the visible light but not transmitting IR rays. CONSTITUTION:The film transmitting the visible light but not transmitting IR rays is attached to the surface of the transparent film used for the image-recording device. When this transparent film reaches the position of the photosensor using IR rays, the IR rays emitted from the light-emitting body in the image- recording device are interrupted with said attached film, and do not reach the photodetector sensitive to the IR rays, thus permitting passage of the transparent film to be detected. |
