| 摘要 |
To enhance the cleaning efficiency of an image carrier due to an oscillating to be applied to a developing means, and suppress a ground fogging phenomenon, in an image forming device of simultaneously developing and cleaning system by a contact type developing. ! In the image formation applying simultaneous developing and cleaning system, at the time of developing, as the oscillating bias voltage for applying to the developing roller of a developing device held in contact with a photoreceptor drum, this image forming device applys the oscillating voltage alternately repeating the first peak voltage Va provided with a potential level between the back ground part potential VD of the electrostatic latent image on the photosensitive drum and the image part potential VL, and the second peak voltage Vb provided with the potential level located on the side opposite to the back ground potential VD with respect to the image part potential VL on the photoreceptor drum 1. ! (C)2000,JPO |
