| 摘要 |
PURPOSE:To securely prevent the disorder and irregularity of an image due to a memory effect area formed in an electrostatic latent image non-formation area on an image carrier owing to the peeling discharge of the tail end part of a transfer material by charging the memory effect area electrostatically and exposing the area. CONSTITUTION:When the surface of the photosensitive drum 1 is charged primarily to charge the electrostatic latent image non-formation area to a -800V surface potential higher than the potential of an electrostatic latent image formation area, the potential of the memory effect area is about -600V. Then even when a laser beam exposure device 3 exposes the non-formation area uniformly to decreases the -800V surface potential of the uniformly exposed area to -400V equal to a conventional potential, the surface potential of the memory effect area only drops to -290V and is higher than a -250V developing bias voltage, so no developing electric field is produced and the disorder of the image due to the usual transfer of a toner image, formed in the memory effect area, to a transfer material P is eliminated. |
