Charging device, process cartridge and image forming device

摘要

A charging unit, used for an image forming device, is provided, which comprises a conductive base, and a single-layered resistant layer, covering on a surface of the conductive base. The charging unit is in contact with an electrified body, and by applying a voltage to the conductive base, a charging process is performed in a contact charging manner. Furthermore, the single-layered resistant layer has a thickness equal to or below 0.7 mm, and has a surface resistance between 1x10³ (Omega/□) and 1x10¹⁵ (Omega/□). Therefore, a charging roller can be made with a very simple structure of the single-layered resistant layer surrounding the core metal, so that a cheap conductive roller can be provided. In addition, the charging unit can be spaced from the electrified body by a small gap and the resistant layer can include nylon.