Patent ID: 8862009
Filing Date: 2014-10-14
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 generated by said exciting coil toward said rotatable heating member; a first moving mechanism configured to move at least one of said plurality of magnetic cores so as to be capable of taking a first position and a second position remoter from said exiting coil than the first position: 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 second moving mechanism configured to move said magnetic flux suppressing member; and a controller configured to control said first moving mechanism and said second moving mechanism depending on a width of the recording material, wherein 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 controller places said magnetic flux suppressing member in a positional relationship such that said magnetic flux suppressing member opposes a magnetic core located in the first position, the magnetic core located at the first position being adjacent to a magnetic core located in the second position.