Induction heating fixing device with an extended pressure contact area for use with magnetic toner

Abstract

An induction fixing device is provided which uses a magnetic toner for image formation but is easy to reproduce a true image while preventing the toner from being moved even if influenced by a magnetic field generated for induction heating. In the induction heating fixing device of the present invention, a pressure contact area DS, through which a sheet of printing paper having a pattern of a magnetic toner is conveyed with the magnetic toner being fixed to the printing paper under the action of induction heating, is set to be broader than a range in which the magnetic toner receives a force that causes it to move under the influence of a magnetic field generated by an induction heating means 25. With this arrangement, when the printing paper is conveyed to reach a place where the magnetic toner on the surface of the printing paper is subjected to a moving force due to the magnetic field from the induction heating means 25, pressure has already been applied to the magnetic toner by a pressurizing means 10, 14, 20 so as to prevent movement of the magnetic toner. Thus, a true image can be easily reproduced without movement of the magnetic toner at the time of induction heating.

Dependencies are inferred from the claim text.