Electrophotographic apparatus.

摘要

An electrophotographic apparatus capable of forming image of excellent quality by using a photosensitive drum of a small diameter. The photosensitive drum has a small outer diameter drum having a circumferential length shorter than 1/2 of the image size in the drum rotating direction, the photosensitive drum and the image-forming cycle are so related to each other that a piece of image is formed after the drum is revolved many times, and the amount of discharge is so set that in forming a piece of image, the residual potential is 10% or less of the charged surface potential after the discharge of the first time of revolution, and an increase in the residual potential is not more than 30% after the discharge of the last time of revolution.