| 摘要 |
PURPOSE:To surely reproduce an excellent image over a long period, without increasing the resistance value of an electric conductive member even if it is operated for a long time by applying a current to reverse the positive and negative of tame current flowing in the conductive member by a specific charge amount at each prescribed interval. CONSTITUTION:The roller-like conductive member (electrifying roller) 1 is brought into contact with a body to be electrified 2, to apply a voltage between the electrifying roller 1 and the body to be electrified 2 by a power source 3 and genet-ate an electric field between the body 2 and the roller 1. Thus, when the body to be electrified 2 is electrified, electrifying operation is repeated while the positive and negative of ant applied current are reversed by the specific charge amount at each prescribed interval. At this time, it is preferable that the integrated value of the current in the reverse direction by the reverse is set 25-175% of an integrated current value in the forward direction. It is ideally preferable that the current in the reverse direction substantially having the same quantity as that in the forward direction is imparted. In other words, the conductive member 1 is operated by a cycle that the integrated current value in the reverse direction only for suppressing the rising rate of resistance by the application of the voltage is applied, the rising of the resistance value of the conductive member 1 can be suppressed. |
