| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fixing device in which the induction heating of the total width of a member to be heated is forcibly prevented when a magnetic flux shield part different in the shield width of a magnetic flux by a rotation position is freely turned, and to provide an image forming apparatus. Ž<P>SOLUTION: In the fixing device capable of changing the width of the path of the magnetic flux by turning a center core 55 by a prescribed drive means, at least a shield part D1 where the shield width of the path of the magnetic flux acting on a heating roller 53 is the total width of the heating roller 53 is provided in the center core 55 and the position of the centroid 55g of the center core 55 and the position of the shield part D1 (total width shield part) in the center core 55 are set so that when the center core 55 is freely turned, the center core 55 may be turned by gravity until the shield part D1 (total width shield part) is interposed on the path of the magnetic flux between an induction coil 54 and the heating roller 53. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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