Patent ID: 8229339
Filing Date: 2012-07-24
Classification: G03G

Abstract:
1. A fixing device comprising: a heating member; a pressing member; a coil arranged along an outer surface of the heating member and generating a magnetic field to induction heat the heating member; a magnetic core arranged around the coil to form a magnetic path between the heating member and the magnetic core, and guiding the magnetic field generated by the coil to the heating member; a path switching member switching the magnetic path between a first path in which the induction heating of the heating member is promoted and a second path in which the induction heating of the heating member is inhibited; and a magnetism adjustment member fixedly arranged over a range of the magnetic field including the first path and the second path; the magnetism adjustment member has a plurality of ring-shaped portions that are formed from a single wire material having an endless shape, and each of the ring-shaped portions extends in a longitudinal direction of the magnetic core according to a size of the sheet.