| 摘要 |
PURPOSE:To weaken the ionic wind and to prevent deterioration of a photosensitive body by dividing a grid of an electrostatic charging device into plural grids, and impressing each different voltage which becomes higher successively in the advancing direction of the photosensitive body. CONSTITUTION:A grid extended between a discharge electrode 1 and a photosensitive body 3 is divided into two, namely, G1 and G2, and voltages of 300V and 600V are impressed to the grid G1 and G2, respectively. As for an electrostatic charging device of this constitution, the surface potential of the photosensitive body 3 has two stages, rises up to the potential of the grid G2, a charging current becomes a distribution having two peaks, and a peak value of its current is suppressed low. In a place where the charging current is large, ions flow in large quantities, activated particles increase, and the photosensitive body is deteriorated, but since the peak value of the charging current is low in this way, the ionic wind is weakened and deterioration of the photosensitive body can be prevented. |
