Patent ID: 8410408

Claim:
An induction heating unit comprising a magnetizing coil attached on a coil bobbin which is disposed outside of an annular body to be heated, the unit comprising: a first layer of elastic adhesive provided on an outer surface of the coil bobbin; the magnetizing coil provided on the first layer of elastic adhesive, the magnetizing coil being wound beforehand following an attaching surface; a second layer of elastic adhesive provided on the magnetizing coil; a first insulating sheet provided on a part of the second layer of elastic adhesive; a third layer of elastic adhesive provided on the first insulating sheet; a first demagnetizing coil provided on the third layer of elastic adhesive, the demagnetizing coil being wound beforehand following an attaching surface; a fourth layer of elastic adhesive provided on the first demagnetizing coil; a second insulating sheet provided on a part of the fourth layer of elastic adhesive; a fifth layer of elastic adhesive provided on the second insulating sheet; a second demagnetizing coil provided on the fifth layer of elastic adhesive, the demagnetizing coil being wound beforehand following an attaching surface; and a sixth layer of elastic adhesive provided on the second demagnetizing coil.