| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high quality image of small endurance fluctuation using simple and low-priced constitution, without providing an exclusive sensor or the like. SOLUTION: A cartridge C is provided with a memory 22 and time, when the cartridge C is driven in an image forming device main body is stored. Threshold information about the used amount determined by characteristics of a photosensitive material of a photoreceptor drum 1 used for individual cartridges and coefficient information of an operation formula, determined by contacting pressure between the photoreceptor drum 1 and a cleaning blade 10 and the electrical characteristics of an electrostatic charging roller 2 are stored in the memory 22 at the time of manufacturing. Amount of the cartridge C to be used is calculated by the drive time and the coefficient information stored in the memory 22 and the calculated value is compared with the threshold information of amount of the photoreceptor drum to be used in the memory 22 of the cartridge. When the calculated value reaches the threshold, quantity of exposed light is changed. |
