| 摘要 |
A fixing device is provided with a heating member, a pressing member, a coil, a fixed core, a movable core and a shielding member provided on the movable core and a position switching unit moving the shielding member between a shielding position where a ring part shields magnetism and a retracted position where the ring part does not shield magnetism. A first area requiring magnetic shielding and a second area not requiring magnetic shielding are selectively set in the heating member. The shielding member includes a first annular portion provided at a position corresponding to a boundary part between the first and second areas, and the first annular portion has a shape closed in a circumferential direction and is electrically insulated at a circumferential part when viewed in an axial direction of the movable core.
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