Patent ID: 9563159
Date: 2017-02-07
CPC Classifications: G03G

Claim:
1. An image heating apparatus for heating an image formed on a recording material, said image heating apparatus comprising: a cylindrical rotatable member including a base layer and an electroconductive layer; a helical coil disposed in a hollow portion of said rotatable member, said coil having a helical portion of which a helical axis extends along a generatrix direction of said rotatable member; and a magnetic core disposed in the helical portion of said coil, wherein an AC magnetic field, formed by an alternating current flowing through said coil, causes the electroconductive layer to generate heat through electromagnetic induction heating, wherein the base layer has a volume resistivity higher than that of the electroconductive layer, and a specific gravity smaller than that of the electroconductive layer, and wherein the electroconductive layer is formed of at least one of silver, aluminum, and austenitic stainless steel.