Patent ID: 8185030

Claim:
A fixer for fixing an image on a sheet of recording media, comprising: a fixing member including a rotary heat generator; a pressure member to form a nip with the fixing member to sandwich the sheet therebetween; an excitation coil disposed facing a heat generation layer of the rotary heat generator, to generate magnetic flux that inductively heats the heat generation layer; a loop-shaped demagnetization coil unit disposed facing the heat generation layer, to generate magnetic flux that partly counteracts the magnetic flux generated by the excitation coil; a first area enclosed by both the excitation coil and the demagnetization coil unit; a first magnetic core disposed in the first area; a second area located outside a loop of the demagnetization coil unit and enclosed by the excitation coil; and a second magnetic core disposed in the second area, the second magnetic core being magnetically continuous with the first magnetic core in a rotary axial direction of the rotary heat generator.