| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic induction heating coil which can shorten a warm-up time and makes a quick start, suppress falls in the temperature on both end sides of a heating roller, and obtain a uniform temperature distribution, and is suitable for a heat fixing device with superior picture quality. SOLUTION: The electromagnetic induction heating coil 2, arranged in a heat roller constituting the heat fixing device comprises a large-loop main coil 2A constituted by winding a heat-resisting coil bobbin 3 with an insulating electric conductor 7 such as collective twisted wire and Litz wires and two small-loop subordinate coils 2B and 2C, which are wound continuously to the main coil 2A or individually so that they are positioned above or below both end sides of the main coil 2A.
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