INDUCTION HEATING DEVICE, INDUCTION HEATING ROLLER DEVICE, HEATING ROLLER IN THE INDUCTION HEATING ROLLER DEVICE, FIXING DEVICE AND IMAGING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an induction heating device and an induction heating roller device of high electric power transmission efficiency and improved mechanical strength, eliminating unevenness in the temperature on the surface of a roller, the unevenness on the surface or radiation noise, and a heating roller in the induction heating roller device, and a fixing device and an imaging device using the above.;SOLUTION: The induction heating device comprises an induction coil device provided with a primary coil, a first secondary coil, disposed coaxially on the outside of the primary coil of the induction coil device, for generating heat by itself with the induced current as air-core transformer coupled to the magnetic field formed by the primary coil, and a second secondary coil, disposed coaxially on the outside of the first secondary coil; the second secondary coil is air-core transformer coupled to the magnetic field, formed by the primary coil but the quantity of the self-heating generation is smaller than that of the first secondary coil. It is preferable that the secondary side resistance Ra of the first secondary coil 1ws be nearly equalized to the secondary reactance Xa, and that the secondary resistance Ra of the second secondary coil 2ws be different from the secondary reactance Xa by a large amount. The induction coil device IC may have plural primary coils wp, and the primary coils wp can be connected to wire pairs WP parallel.;COPYRIGHT: (C)2002,JPO