IMAGE FORMING APPARATUS, METHOD FOR APPLYING ELECTRIFYING VOLTAGE AND METHOD FOR APPLYING DEVELOPING BIAS VOLTAGE

摘要

PROBLEM TO BE SOLVED: To prevent fogging potential from arising when an image forming apparatus rises and falls, thereby preventing unnecessary toner adhesion and carrier deposition and stabilizing image density; and to shorten first copying time.;SOLUTION: An electrifying means has first electrifying voltage and second electrifying voltage for electrifying a photoreceptor, whose voltage values are different from each other. The surface potential of the photoreceptor electrified at the first electrifying voltage lower than the second electrifying voltage is measured by a measuring means, and the second electrifying voltage is adjusted based on the result of the measurement.;COPYRIGHT: (C)2008,JPO&INPIT