| 摘要 |
A method of controlling AC voltages applied to a charging member to bring a photoreceptor to a state of uniform charging, with reduced time required for setting AC voltage value. The method includes the steps of determining a relational expression between AC voltage and AC current flowing into the charge receptor member using a discharge onset voltage Vth, a first detection current flowing into the charge receptor member under a first AC voltage of 2xVth or larger, a second detection current under a second AC voltage, which is 2xVth or larger and different from the first AC voltage; and obtaining a third AC voltage by substituting a predetermined standard AC current value into the relational expression. When the third AC current under the third AC voltage, which is actually applied to the charging member, is within a predetermined range, the third AC voltage is set as the AC voltage to be applied to the charging member.
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