| 摘要 |
PURPOSE:To reduce the influence by the wear of a photoreceptor with a simple structure. CONSTITUTION:A charging means 11 for charging the surface of a photoreceptor 10, an AC power source for supplying an AC current to the charging means, a DC power source 14 for supplying a DC current to the charging means 11 in superposition to the AC current, a control means 21 for controlling the DC power source 14 on the basis of detection signals from a voltage detecting means 17 and a current detecting means 18, and an environment detecting means 19 for detecting temperature and humidity and outputting these detection signals to the control means 21 are provided. Thus, the change of charge potential by deterioration of the photoreceptor can be prevented. Further, since the control is conducted on the basis of detection signals such as temperature and humidity from the environment detecting means, the fluctuation of impedance of the charging means by the influence of temperature and humidity can be prevented. |
