| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of top image density unevenness and development ghost in an image forming apparatus adopting a touchdown developing system. SOLUTION: A control part 100 for the image forming apparatus sets the rotational speed of a developing roller 72 so that the density of a solid image formed by one rotation of the developing roller 72 is a predetermined first value or more based on the density of a solid image formed on an intermediate transfer member. Then, it sets the potential difference of the voltages to be applied on the developing roller 72 and a magnetic roller 73 by a voltage applying part 80 so that the density difference of the density of the solid image formed by one rotation of the developing roller 72 and the density of the solid image formed by two rotations of the developing roller 72 is a predetermined second value or less. COPYRIGHT: (C)2010,JPO&INPIT |
