| 摘要 |
PURPOSE:To perform regular development in case of a copy mode and a reversal development in case of a printer mode selectively, by using a photoreceptor having photoconductivity consisting of amorphous silicone and switching a latent image forming means. CONSTITUTION:A photoreceptor 1 has a photoconductive layer consisting of amorphous silicone having optical sensitivity to positive and negative polarities for electric charge. A latent image forming means for copying is provided with a corona discharger 2 charging positively to the photoreceptor 1 and an exposing device for copying 4. A latent image forming means for printer is provided with a corona discharger 3 charging negatively to the photoreceptor 1 and a light source 17 and an optical image scanning device 5 for printer including a liquid crystal light shutter 16. By switching latent image forming means for a copy mode and a printer mode which are formed by the above mentioned arrangements, charging polarity of electrostatic latent images at both mode times is reversely changed. Then, a regular development in case of a copy mode time and a reversal development in case of a printer mode are performed selectively by a developing device 6. |
