| 摘要 |
PURPOSE:To detect exactly a peeling error without exerting the influence on a photosensitive body by providing a means for on-and-off-controlling a light from a light emitting element as necessary, and also storing a detected result of the peeling error by a storage means. CONSTITUTION:A light emitting element 2 of an LED, etc. for emitting a light having its wavelength in an absorbing wavelength area of a photosensitive layer of a photosensitive body 1, in its surface direction, and a photodetector 3 of a phototransistor TR, etc. for photodetecting a light from this LED 2 and a reflected light from the surface of the photosensitive body are provided in the vicinity opposed to the surface of the photosensitive body 1. The incident optical axis and the photodetecting axis of said LED2 and TR3 are held by a holding member 4 so as to cross each other at a prescribed angle theta1 in the incident point. In this way, a peeling error can be detected exactly without exerting influence on the photosensitive body. |
