Patent ID: 7978991
Filing Date: 2011-07-12
Classification: G03G

Abstract:
1. An image forming apparatus including an image carrier, the image forming apparatus comprising: a charging member disposed in contact with or close to the image carrier so as to charge the image carrier, said charging member having a resistance value which varies according to at least one of an environmental temperature or an environmental humidity of the image forming apparatus; a high voltage generating circuit that applies an oscillating voltage to the charging member, wherein the oscillating voltage comprises a DC voltage and an AC voltage superimposed on each other; a voltage control portion that controls the high voltage generating circuit such that a peak-to-peak voltage value of the AC voltage reaches a target voltage value; and the voltage control portion having an initial voltage adjusting portion that is configured to perform a target voltage setting operation to set the target voltage value upon determination that power to the image forming apparatus is turned on and upon determination that the image forming apparatus returns from a power saving mode, the target voltage setting operation including: