| 摘要 |
PURPOSE:To remove unnecessary toner stuck on a part where there is no image is formed and obtain a sharp toner image having no ground fogging by charging uniformly a charge holder which carries toner and making the toner equal in polarity, and producing an electric field between an electrode and the charge holder which are provided opposite each other. CONSTITUTION:The selenium photosensitive body 1 formed by vapor-depositing selenium 3 on a conductive base 2 is charged positively and then exposed to an image to form a positive electrostatic latent image. Then, a developer obtained by mixing an iron powder carrier and toner is scattered over the photosensitive body 1 and then removed with a magnet, so that negative charged toner 4 is stuck on an image part having the electrostatic image and positive charged toner 5 with the opposite polarity; 5 and uncharged toner 6 are stuck on a no-image part. Then, the photosensitive body 1 is charged uniformly and negativelyu by a corona charger 7 to obtain negatively charged toner particles 5' and 6', and an AC voltage is applied between the electrode 8 and base 2 which are arranged opposite each other, thereby removing the toner particles 5' and 6' from the no-image part. |
