Patent ID: 8588665

Claim:
A toner carrier that conveys toner particles hopping on an outer circumferential surface of the toner carrier to a development region facing a latent image carrier, the toner carrier comprising: a base member including at least an insulating layer made of an insulator in an outer surface of the base member; and at least one electrode in a ribbon shape helically formed on the outer surface of the base member, wherein the electrode is formed to have a cross section in which both sides of the electrode are inclined so that the electrode gradually tapers down from the base member toward an outmost side thereof, and is formed to be flat in a center portion in a width direction of the electrode so that an outer surface of the center portion is in parallel with the outer surface of the base member, wherein the electrode is provided as only a single electrode, and a voltage is applied to the electrode and a conductive core of the base member so that an alternating electric field is formed between the electrode and the core.