| 摘要 |
PROBLEM TO BE SOLVED: To prevent a sandy-surface image from being formed extending over the use of a long term and to minimize the chip of a photoreceptor drum. SOLUTION: A process cartridge 10 is provided with an NVRAM 14 storing information related on the using amount of the photoreceptor drum 3. Besides, a device main body is provided with a read-out/write means 16, a judgement means 17 and a high-voltage power source 11 impressing a vibration voltage obtained by superimposing an AC voltage on a DC voltage with respect to an electrostatic charge roller 4. Then, the voltage impressed on the roller 4 is changed according to the using amount of the drum 3. |
