| 摘要 |
PURPOSE:To perform uniform printing with high density by applying a first voltage of a prescribed frequency to a control electrode and applying a second voltage of a higher frequency than the prescribed frequency per printing information to a segment electrode plural times. CONSTITUTION:A toner carrier 12 holding a toner layer on its surface carries toner T along a prescribed path. A common electrode body 8 is rotatably disposed on the opposite side to the toner carrying surface of the toner carrier 12 and a spiral electrode 9 is provided on its periphery. On the other hand, a signal electrode body 3 is oppositely disposed on the toner carrying surface of the toner carrier 12 and constituted of plural segment electrodes 3b1 and 3b2, while control electrodes 13a to 13c are provided inside of the toner carrier 12. The first voltage of the prescribed frequency is applied to the control electrodes 13a to 13c and the second voltage of higher frequency than the prescribed frequency per printing information is applied to the segment electrodes 3b1 and 3b2 plural times, so that the toner T on the toner carrier 12 can be transferred to recording material P fed between the toner carrier 12 and the signal electrode body 3. The uniform printing with high density can thus be performed. |
