Patent ID: 6900419

Claim:
A fixing apparatus comprising: a heat-producing member which has a hollow cylindrical shape or an endless belt-like shape, is formed in such a manner that a peripheral surface thereof can move at a predetermined speed if it has the cylindrical shape and a belt surface thereof can move at a predetermined speed if it has the belt-like shape, and can supply a predetermined heat to a material having a thermofusion property and a base material holding the material having the thermofusion property; a pressure provision mechanism which is arranged so as to be capable of providing a predetermined pressure to the heat-producing member with the material having the thermofusion property and the base material being interposed between itself and the heat-producing member, and can move in accordance with the peripheral surface and the belt surface of the heat-producing member when the peripheral surface and the belt surface of the heat-producing member are moved at a predetermined speed; a heating mechanism which is arranged in a predetermined positional relationship with respect to the heat-producing member and arranged in such a manner that at least two coil members to which different resonance frequencies are given have a predetermined positional relationship in a direction orthogonal to a direction along which the peripheral surface and the belt surface of the heat-producing member are moved, and can generate a predetermined power or a magnetic flux required to cause the heat-producing member to output a predetermined quantity of heat when a current having a first frequency, a second frequency or a third frequency which is different from the first and second frequencies is supplied; a temperature detection mechanism which detects a temperature at a predetermined position of the heat-producing member; and a setting mechanism which sets a frequency of the power of the magnetic flux outputted from the heating mechanism to any of the first to third frequencies based on the temperature at the predetermined position of the heat-producing member detected by the temperature detection mechanism.