| 摘要 |
PURPOSE:To eliminate difference in image density due to irregularity of the potential of a photosensitive body by setting the quantity of preexposure nearly >=10 times the quantity of preexposure for obtaining the same potential as the mean potential of a light part of an electrostatic latent image as to a laser beam printer. CONSTITUTION:A photosensitive body 1 which is irradiated by a preexposure source 2 and charged electrostatically uniformly by an electrifier 3 is scanned with a laser beam L which is modulated with an image signal. The quantity of preexposure is set >= 10 times the quantity P0 of exposure required to obtain the light part potential of the electrostatic latent image after the image exposure. Consequently, a ghost is eliminate completely and the potential difference of the photosensitive body which is generated according to whether a transfer member is present or not is reduced, thereby obtaining an image having no density irregularity. |
