Patent ID: 8536498

Claim:
An induction heating apparatus for heating a steel sheet traveling in a longitudinal direction that is in a non-magnetic state at a temperature above the Curie point or non-magnetic metal plate, comprising: an induction coil for surrounding the steel sheet or the metal plate, said induction coil including an upper induction coil for being located above the steel sheet or the metal plate and a lower induction coil for being located below the steel sheet or the metal plate, said upper induction coil being spaced from said lower coil in the longitudinal direction of the steel sheet or the metal plate, said spacing being a constant longitudinal distance across a transverse direction of the entire width of the steel sheet or of the metal plate, wherein each of the upper induction coil and the lower induction coil is arranged obliquely at an edge area of the steel sheet or the metal plate so as to form an oblique angle with the transverse direction of the steel sheet or the metal plate.