Patent ID: 7081604

Claim:
An induction fixing device comprising: an excitation coil; a heat generating element for induction heat generation by magnetic flux generated by said excitation coil, wherein said heat generating element generates heat, substantially by the induction heat generation, at a position where said heat generating element is opposed to said excitation coil with a small gap therebetween; a magnetic flux adjustment member for adjusting an amount of the magnetic flux acting on said heat generating element among the magnetic flux generated by said excitation coil, said magnetic flux adjustment member being electroconductive and non-magnetic; moving means for moving said magnetic flux adjustment member; a magnetic core, disposed adjacent said excitation coil without interference with the gap, for increasing the magnetic flux acting on said heat generating element; wherein said moving means is effective to reduce the magnetic flux acting to said heat generation position by moving said magnetic flux adjustment member in between said magnetic core and said excitation coil.