Image heating device and image forming device using the same

摘要

An image heating device comprises a cylindrical heating roller 21 with a Curie temperature of 210 DEG C, a magnetization coil 23 for magnetizing the heating roller 21 with an alternating magnetic field, which is arranged inside the heating roller 21, and a nip portion 27 for heating a recording material 15 that carries a toner image with heat from the heating roller 21, while the recording material 15 is being conveyed along said nip portion 27. The ratio between the amount of heat generated in said heating roller 21 at Curie temperature or higher to the amount of heat generated at room temperature is not more than 1 / 2. With this configuration, the heating roller 21 can regulate its own temperature to stabilize at a temperature that is suitable for fixing, and the problems of partial overheating or underheating, unstable heat generation, or damage of the device can be eliminated.