| 摘要 |
<p>PURPOSE:To obtain an electric signal image superposed on an exposure electrostatic positive image by exposing an original to be copied and forming an electrostatic positive image, then drawing a static charge image by the electric signal. CONSTITUTION:A photosensitive drum 1 is electrostatically charged uniformly by an electrostatic charger 2 and exposes the original 4 by an optical system 3 to form the electrostatic positive image. The electrostatic image is superposed on the image by an electrostatic image writing mechanism 6 and they are developed by a developing mechanism 8 to transfer a toner image to a form 9. An ion flow control type electrostatic image writing mechanism impresses a high volage to a corona 13 to generate corona ions, which are converged by an electrode for ion flow convergence; and a pulse voltage is impressed to an electrode 15 for ion flow on-off control from a voltage generating circuit 16 to control the ion flow, forming the static charge image on the drum 1. Only the electric signal of the mechanism 6 may be used only for the exposure copying of the original 4 to form an image.</p> |
