Title:
画像形成装置
Document Type and Number:
Japanese Patent JP4110886
Kind Code:
B2
Abstract:
An electrophotographic image forming apparatus having a photosensitive member 1, a charging roller 2 and a developing roller 31, and including an output variable power source 8 common to the charging and the developing rollers 2 and 31 for applying voltages to the charging and developing rollers 2 and 31, respectively, a power source output control portion 9, and a voltage changing device (Zener diode D1) interposed between the developing roller 31 and the power source 8, wherein, when the voltages applied to the charging and developing rollers 2 and 31 are raised to and lowered from voltages required for image formation, respectively, the control portion 9 controls an output of the power source 8 to perform the raising and lowering of the applied voltages for a predetermined time while keeping a potential difference for suppressing movement of developer onto the photosensitive member 1 between the voltages applied to the charging and developing rollers 2 and 31.
Inventors:
Takayuki Takai
Application Number:
JP2002248292A
Publication Date:
July 02, 2008
Filing Date:
August 28, 2002
Export Citation:
Assignee:
Konica Minolta Business Technologies Co., Ltd.
International Classes:
G03G21/00; G03G15/00; G03G15/02; G03G15/06
Domestic Patent References:
| JP7253693A | ||||
| JP5045958A | ||||
| JP7114319A |
Attorney, Agent or Firm:
Masao Tanikawa