Exposure to light body electric potential control manner

摘要

PURPOSE:To prevent a copy from being stained owing to the residual potential of a photosensitive body by charging the photosensitive body electrostatically with a potential lower than the electrostatic charging potential at the time of normal copying operation prior to the formation of a visible pattern, and erasing the potential and then forming a visible pattern with the residual potential of the photosensitive body. CONSTITUTION:The photosensitive body is charged electrostatically with the potential lower than the electrostatic charging potential at the time of normal copying operation prior to the formation of the visible pattern, this potential is erased, and then the visible pattern is formed with the residual potential of the photosensitive body. A visible pattern detection sensor 5 is connected to a copying process control unit 100, a developing device 4 is connected to the bias output terminal OUTB of a high-voltage current unit 200, and the respective electrodes of an electrostatic charger 2, a transfer device 6, and a separator 7 are connected to the output terminals OUTC, OUTT, and OUTD of the high-voltage power source unit 200 respectively. This high voltage power source unit 200 supplies electric power to the respective electrodes at specific timing according to an indication from the copying process control unit 100. Consequently, the correction quantity of the potential of the photosensitive body is optimized and a copy is prevented from being stained owing to the residual potential of the photosensitive body.