| 摘要 |
PROBLEM TO BE SOLVED: To provide a fixing device that can further reduce the time required to start printing. ! SOLUTION: A fixing device includes heat and pressure application means that has a heating member and a pressure member; the heating member has a cylindrical rotating body having a conductive layer, a coil arranged inside the rotating body, having a spiral shape part with a screw axis substantially parallel to a generating direction of the rotating body, and forming an alternating field causing electromagnetic induction heating of the conductive layer, and a core arranged inside the spiral shape part to guide the lines of magnetic force of the alternating field; the magnetic resistance of the core is 30% or less of the composite magnetic resistance of the magnetic resistance of the conductive layer and the magnetic resistance of an area between the conductive layer and the core, in a section across one end to the other end of the maximum passage area of the image on the recording material with res |
