Patent ID: 9310731
Filing Date: 2016-04-12
CPC Classification: G03G

Claim Text:
1. An image heating apparatus configured to heat an image formed on a recording material, the image heating apparatus comprising: a cylindrical rotatable member including a conductive layer; a coil including a helically shaped portion which is helically wound in a generatrix direction of the rotatable member inside the rotatable member, wherein the coil includes a number of turns and is configured to produce an alternating magnetic field for causing the conductive layer to generate heat by electromagnetic induction; and a magnetic core disposed inside the helically shaped portion, wherein the magnetic core includes a plurality of divided cores into which the magnetic core is divided in the generatrix direction, and wherein the number of turns of the coil per unit length, at a region that corresponds to a boundary between the plurality of divided cores, is larger than the number of turns of the coil at a region that corresponds to the plurality of divided cores.