A fixing device is formed by using a heat generating roller having magnetism
and
electric conductive characteristics and a magnetizing coil opposed to the outer
peripheral of the heat generating roller and generating heat on the heat generating
roller by an electromagnetic induction. The magnetizing coil is formed in such
a manner that 60 copper wires whose surfaces are insulated and have the outside
diameter of 0.2 mm are bundled to form a bundle of wires and the bundle of wires
is drawn in the direction of rotation axis of the heat generating roller and wound
in the direction of a circumference of the heat generating roller. Further, the
magnetizing coil is disposed so that the bundles of wires mutually come into close
contact along the circumference of the heat generating roller to cover the upper
half of the heat generating roller.
