Patent ID: 8903292

Claim:
A fixing device comprising: an induction coil configured to generate a magnetic flux; a heating rotator disposed in a region through which the magnetic flux generated by the induction coil passes, the heating rotator being configured to rotate about a first rotational shaft; a pressurizing rotator disposed to face the heating rotator; a fixing nip formed between the heating rotator and the pressurizing rotator, where a recording medium is nipped and conveyed; and a magnetic core unit configured to form a magnetic path passing inside an inner peripheral edge and outside an outer peripheral edge of the induction coil such that the magnetic path circularly encloses the induction coil, wherein the magnetic core unit includes a plurality of arch core portions and a core supporting member supporting the arch core portions, the arch core portions each having an arch shape facing an outer surface of the heating rotator with the induction coil being interposed therebetween and being arranged at intervals in a direction of the first rotational shaft; each of the arch core portions has first engaging portions formed respectively at both ends thereof and a core main body formed between the first engaging portions; and the core supporting member has second engaging portions with which the first engaging portions are engageable, wherein the core supporting member has a second restriction portion configured to prevent the core main body of each of the arch core portions from moving in a thickness direction of the core main body, wherein the core supporting member has a third restriction portion that is formed integrally with the second restriction portion and configured to prevent the core main body of each of the arch core portions from moving in the direction of the first rotational shaft, and wherein the third restriction portion is shaped like a claw; and the core main body of each of the arch core portions has an engaging concave portion that is concave in the thickness direction of the core main body and with which the claw-shaped third restriction portion engages.