| 摘要 |
PROBLEM TO BE SOLVED: To keep safety even if a temperature control sensor breaks down by eliminating a danger that an accident such as a fire breaks out because a fixing roller is heated beyond the set temperature of fixing in the case of utilizing an induction heating fixing device which uses a heating member having high heating efficiency and small heat capacity and thus shortens warm-up time. SOLUTION: In the induction heating fixing device where transfer material to which a toner image has been transferred is heated by the heating member, the heating member is constituted of a supporting body layer and a surface layer, and, in the supporting body layer, a non-magnetic metallic layer having lower resistivity than that of a magnetic compensating alloy is formed on the outer periphery of a rotating body consisting of the magnetic compensating alloy. Furthermore, in the induction heating fixing device, an induction coil is arranged inside the heating member, and the thickness of the magnetic compensating alloy of the supporting body layer satisfies a relational expression among the specific resistance of the magnetic compensating alloy, the power source frequency of the induction coil and the relative magnetic permeability equal to or under the Curie temperature of the magnetic compensating alloy. COPYRIGHT: (C)2004,JPO
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