| 摘要 |
PURPOSE:To prevent a voltage drop by a constant-voltage element even in case when a transfer material is converted to a low resistance at the time of high humidity, and to restrict an increase of a leak current quantity to a guide, by interposing the constant-voltage element between the guide and a ground side line of a high voltage power source. CONSTITUTION:A high voltage power source 6 makes applied voltage variable by a detecting means 7. By placing a constant-voltage element 11 between a guide 3 and a ground side connecting line 10' of the high voltage power source 6, a voltage drop is prevented by the constant-voltage element 11, and an increase of a leak current quantity to the guide is restricted, in a circuit which passes through a transfer material 5, the guide 3 and the constant-voltage element 11 even in case when the transfer material is converted to a low resistance at the time of high humidity. As a result, the control width is reduced with respect to the same environmental variation which requires a large control width, and also a good transfer control can be executed. |
