| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of a defective image such as image fogging and uneven density due to moisture absorption by installing a moisture absorption control means for controlling the moisture absorption of an electrostatic charging member at the time of not forming an image. SOLUTION: A photoreceptor drum 1 is rotated in a direction shown by an arrow R1, and the drum 1 is uniformly discharged by exposing 3 by an exposure light source 4. By impressing an electrostatic charging voltage on an electrostatic charging roller 2 which is arranged in contact with the surface of the drum 1 and which is rotated in a direction shown by an arrow R2, the surface of the discharged drum is electrostatically charged with a prescribed polarity at a prescribed potential. An electrostatic latent image corresponding to the image information is formed on the electrostatically charged photoreceptor drum 1 by image exposure 5. An air duct 14 is formed adjacent to the electrostatic charging roller 2, air dehumidified by a dehumidifier 13 is made to uniformly blow in the longitudinal direction of the roller 2 through an air sending fan 12. By continuously putting dry air to the roller 2 in such a way, the humidification of the electrostatic charging roller 2 is suppressed, and water is prevented from sticking to the electrostatic charging roller 2 and conductive material lying inside is prevented from being deposited due to the reaction to water. |
