| 摘要 |
PURPOSE:To stabilize control in any environment and to perform uniform electrostatic charging and discharging by controlling a bias voltage between the bare electrode of an electrostatic discharging device and a member to be charged electrostatically by a control means within a predetermined range, and controlling an applied alternating voltage or its frequency when the bias voltage exceeds the control range. CONSTITUTION:Two buried electrodes 11 and 12 are buried in the electrostatic discharging member 1' of the electrostatic discharging device 1 and the bare electrode 13 is provided on the surface of a dielectric 10. Those electrodes 11 and 12 are applied with the voltage of an AC power source 14 to initiate electrostatic discharging. Then the electrode 13 is applied with the bias voltage which extracts ions generated by the electrostatic discharging toward the member 2 to be charged electrostatically. A detection part 20 which detects electrostatic charging and discharging currents flowing to the member 2 is provided between the electrode 13 and ground. A control circuit 21 is connected to the output side of this detection part 20 and the charging and discharging currents are controlled by the circuit 21 to preset values according to the output of the detection part 20. When the current exceeds the control range, the voltage or frequency of the power source 14 which applies the voltage to the electrodes 11 and 12 is controlled.
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