NON-CONTACT TYPE CHARGING ROLLER, ITS FORMING METHOD, CHARGING DEVICE EQUIPPED WITH NON-CONTACT TYPE CHARGING ROLLER AND IMAGE FORMING APPARATUS EQUIPPED WITH THE CHARGING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a non-contact type charging roller whose irregular charge is restrained and which imparts AC voltage to be superposed at low voltage by reflecting the surface shape of a photoreceptor in the charge potential imparting surface of the charging roller and further making mechanical accuracy in a shaft direction high, thereby maintaining and securing a charging gap. SOLUTION: The non-contact type charging roller coming into contact with both ends of the photoreceptor of the image forming apparatus and forming the charging gap in a range being the charging surface of the photoreceptor so as to impart charge potential to the surface of the photoreceptor is a roller having a base layer containing synthetic rubber or synthetic resin and conductive substance on a shaft member made of metal and a surface covering layer containing fluororesin and conductive substance on the base layer, and is formed in the shape of an hourglass by making the diameter of the center part in the shaft direction smaller. COPYRIGHT: (C)2006,JPO&NCIPI