Patent ID: 9057993
Filing Date: 2015-06-16
Classification: G03G

Abstract:
1. An image heating apparatus comprising: a rotatable heating member configured to heat a toner image on a recording material; an exciting coil configured to generate magnetic flux for causing said rotatable heating member to generate heat through electromagnetic induction heating; a plurality of magnetic cores, provided outside said rotatable heating member and arranged in a longitudinal direction of said rotatable heating member, configured to guide the magnetic flux toward said rotatable heating member; a magnetic flux suppressing member configured to suppress the magnetic flux actable from said exciting coil to a part of said rotatable heating member; a moving mechanism configured to move, when the toner image is heated on a predetermined recording material having a width narrower than a maximum width of the recording material usable in said image heating apparatus, said magnetic flux suppressing member depending on the width of the predetermined recording material; and a retracting mechanism configured to retract, from said exiting coil, at least one of the plurality of magnetic cores, wherein, when said magnetic flux suppressing member is placed in a positional relationship by said moving mechanism such that said magnetic flux suppressing member opposes a part of a non-contact region of the rotatable heating member with the predetermined recording material, said retracting mechanism retracts some of the magnetic cores of the plurality of magnetic cores, in a positional relationship such that the retracted magnetic cores do not oppose said magnetic flux suppressing member but oppose the non-contact region of said heat rotatable member.