DISPOSITIF DE DEVELOPPEMENT AYANT UN CORPS DE TRANSPORT DE TONER ET PROCEDE DE FABRICATION D'UN CORPS DE TRANSPORT DE TONER.

摘要

The invention is applied to a developing device having a cylindrical toner carrying body. The cylindrical toner carrying body includes a cylindrical electrically conductive inner layer and a cylindrical semiconductor outer layer. The surface potential at the semiconductive outer layer is controlled by power supplies connected to the electrically conductive inner layer, so that particles of a single-component toner charged by friction can adhere to the semiconductive outer layer surface. In such a developing device having the thus constructed toner carrying body, the electrically conductive inner layer is formed of a cylindrical sleeve made of an electrically conductive metallic material, and the semiconductive outer layer not only is formed of a semiconductive resin layer coated on the outer peripheral surface of the cylindrical sleeve but also has uniform irregularities on its surface.