| 摘要 |
PURPOSE:To execute printing at a high speed by providing a single corotron which is common to plural developing parts corresponding to a color toner, and plural exposing parts peculiar to the plural developing parts, so that the printing can be executed by rotation of once of a photosensitively body. CONSTITUTION:A photosensitve drum 5 is charged by an electrostatically charged corotron 10, and a control signal is outputted to a step-motor 17 from a control part 19. As a result, a displacement mirror 18 is displaced at a prescribed angle, an optical beam 1 is polarized by a fixed mirror 16a, and the fixed mirror 16a executes an exposure to a position of X. An electrostatic latent image of magenta generated by an exposure at the point X is developed by a magenta toner. An electrostatic latent image of yellow generated by an exposure at a point Y is developed by a yellow toner by a developing part 11b. At a point Z, an electrostatic latent image is developed by a cyan toner at a developing part 11c. Images of X, Y and Z are transferred to a form 8 by a transfer corotron 6a in a tansfer part 6, fixed in a fixing part 14 and discharged. In this way, printing can be executed by rotation of once of the photosensitive body, the printing is executed at a high speed, and degradation of sensitivity caused by a dark attenuation can be prevented. |
