| 摘要 |
PURPOSE:To execute printing at a high speed, and to prevent a drop of sensitivity by providing an electrostatically charged corotron on the pre-stage of every developing part corresponding to each color, and executing an exposure corresponding to each color between the charged corotron and a developing machine. CONSTITUTION:An electrostatically charged corotron 10a charges a photosensitive dum 5, and a control signal is ouputted to a step-motor 17 from a control part 19. A displacement mirror 18 is displaced at a prescribed angle, and optical beam 1 is polarized by a fixed mirror 16a, and an exposure is executed to a position of A. The exposure at the point A is executed by a color component of green, and its electrostatic latent image is developed by a magneta toner by a developing part 11a. In this same way, at the point B, the exposure is executed by a component of blue color, and the electrostatic laten image is developed by a yellow toner. The exposure at the point C is executed by a component of red color and the development is executed by a cyan toner. In this way, printing is executed at a high speed, and degeadation of sensitivity can be prevented by using a photosensitive drum whose dark attenuation is comparatively large. |
