Patent ID: 7427729
Filing Date: 2008-09-23
Classification: G03G

Abstract:
1. An image heating apparatus comprising: an annular heat-producing member having an inner peripheral surface and an outer peripheral surface that produce heat based on a magnetic flux; a coil facing the outer peripheral surface that generates magnetic flux that acts upon said heat-producing member; and a magnetic flux reduction section facing the inner peripheral surface and attached to a rotatable core which is made of a ferromagnetic material and is rotatably arranged inside the annular heat-producing member, said magnetic flux reduction section reducing, of the magnetic flux generated by said coil, magnetic flux that acts upon a paper non-passage area of said heat-producing member, wherein the magnetic flux reduction section is displaced between a first position in which the magnetic flux that acts upon the paper non-passage area is reduced and a second position in which the magnetic flux that acts upon the paper non-passage area is not reduced, by rotating said core.