Patent ID: 8571458

Claim:
A fixing device that fixes an image on a recording medium, the fixing device comprising: a coil disposed along an outer surface of a heating member and configured to generate magnetic flux for heating the heating member through induction heating; and a core unit being configured to constitute a part of a magnetic path around the coil, wherein the core unit includes a plurality of core bodies arranged in a width direction of the recording medium to be conveyed, the core bodies being made of magnetic material; and a shaft having an outer surface on which the plurality of core bodies are arranged, a length of the outer surface being longer than a sum of lengths of the plurality of core bodies arranged on the outer surface, the core body lengths including axial tolerances of the plurality of core bodies, wherein a gap is provided between any adjacent ones of the plurality of core bodies arranged on the shaft, and wherein the gap is located in or around a center of a sheet passing region of a recording medium having a minimum printable size.