Patent ID: 8019266

Claim:
A fixing device comprising: a first rotary body, the first rotary body being a belt, having a heat generating layer from which heat is generated by action of a magnetic field and formed in a substantially circular cylindrical shape, a thermal capacity of the first rotary body is in the range of from equal to or approximately 5 J/K to equal to or approximately 60 J/K; a second rotary body contacting the first rotary body; a magnetic field generating unit for generating a magnetic field, the magnetic field generating unit being arranged to have a predetermined separation from the inner circumferential face of the first rotary body or to have a predetermined separation from the outer circumferential face of the first rotary body; and a heat generation controlling member which is arranged facing the magnetic field generating unit, with the first rotary body being between the heat generation controlling member and the magnetic field generating unit, the heat generation controlling member comprising a temperature-sensitive magnetic material which is a non-heat generating body having a Curie temperature and controlling generation of heat of the heat generating layer.