| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus where the wearing of a photoreceptor is reduced by omitting an auxiliary AC apply process, also, the occurrence of a defective image is prevented, and also, an easy electrification control is attained. <P>SOLUTION: The image forming apparatus is equipped with the photoreceptor 2 whose surface is coated with a photoreceptive layer where an electrostatic latent image is formed, and a contact type electrifying roll 3 to which a bias obtained by superposing an AC component on a DC component is applied so as to electrify the photoreceptor 2 at a prescribed potential. The image forming apparatus includes: a film thickness detecting means 3 for detecting the film thickness of the photoreceptive layer on the photoreceptor 2; an environment detecting means S for detecting the environment; and a contact area changing means 35 for changing a contact area of the contact type electrifying roll 3 with the photoreceptor 2 based on the detection results by the film thickness detecting means 33 and the environment detecting means S. <P>COPYRIGHT: (C)2007,JPO&INPIT |
