To eliminate the problem caused by the temperature rising of a paper non-passing part by preventing or mitigating the temperature rising of the paper non-passing part of an image heating device at the image heating device of an electromagnetic induction heating system and an image forming device provided with the image heating device.
In this image heating device which has a magnetic flux generating means having an exciting coil 3 and a magnetic material core 5 and an induction heating element 1 executing electromagnetic induction heat generation by the action of the generated magnetic flux of the magnetic flux generating means and which heats an image on a recording material by the heat of the induction heating element by introducing and carrying the recording material to a heating part N, the magnetic material core 5 is plurality divided into parts 5(b), 5(a) and 5(b) in a direction orthogonal with the carrying direction of the recording material, and is made movable by moving means 6(a), 7, 8, 9 and 10, and the core moving means incorporates a shape memory alloy member 10 or bimetal and moves a core by using displacement corresponding to the temperature of the shape memory alloy member 10.
HAYASHI YASUHIRO
FUJITA TAKESHI
OOTA TOMOICHIROU
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