| 摘要 |
An image forming apparatus includes a photoconductive drum, a charging roller to charge the photoconductive drum, a thermistor to detect an ambient temperature of the photoconductive drum. A ROM stores impedance characteristics data that is obtained in advance by experiments and that represent a relationship between the ambient temperature of the photoconductive drum and an impedance between the charging roller and the photoconductive drum. Current ambient temperature of the photoconductive drum detected, current impedance between the charging roller and the photoconductive drum is calculated from the current ambient temperature of the photoconductive drum and the impedance characteristics data, and a voltage applied to the charging roller is adjusted based on the current impedance.
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