| 摘要 |
PURPOSE:To prevent contamination of an optical system, electrically charging system and conveying system and to form a stable image for a long period of time by providing a means for sticking the developer scattering from a developing device to a latent image holding member. CONSTITUTION:A wind conducting path 19 of which the aperture is directed to a photosensitive drum 11 is provided to the lower part of a developing device. The flow of air i formed in the direction of an arrow (a) in the path 19 by a fan 20 which is an air blowing means driven by an electric power source. OPC or alpha-Si, alpha-Se or the like is used for the drum 11 so that even if the voltage VL in the bright part maintains a certain specified voltage without decreasing down to 0V in the stage of using a Carlson process. The toner scattered from a developing part A is flows into the aperture of the path 19 by gravity and drum wind. This toner is brought in proximity to the drum 11 by the wind delivered from the path 19 and is stuck to the drum 11 by the static force between the electric charge possessed by the toner and the surface potential of a photosensitive body and is thus prevented from scattering in the device and contaminating the inside of the machine. |
