| 摘要 |
PROBLEM TO BE SOLVED: To provide a charging device and an image forming apparatus which suppresses contamination by external additives, etc. while maintaining the charging capability.SOLUTION: A brush position change part 23 arranges a shaft 21 at a position where biting of electrostatic transplanted hair of a brush 22 with respect to a photoreceptor 10 is a biting area Ka with a length of 0.5 mm in the rotation direction when the number of sheets used in an image forming apparatus 1 is 10,000 or less. The brush position change part 23 changes the position of the shaft 21 so as to make the biting of the electrostatic transplanted hair of the brush 22 with respect to the photoreceptor 10 be a biting area Kb with a length of 1.25 mm in the rotation direction when the number of sheets used in the image forming apparatus is more than 10,000 but no more than 20,000. Further, the brush position change part 23 changes the position of the shaft 21 so as to make the biting of the electrostatic transplanted hair of the brush 22 with respect to the photoreceptor 10 be a biting area with a length of 2.0 mm in the rotation direction when the number of sheets used in the image forming apparatus is more than 20,000 but no more than 30,000. |
