| 摘要 |
PROBLEM TO BE SOLVED: To provide an induction heating device capable of preventing an arc trace by suppressing the generation of spark between a material to be heated and a conveying means by surely reducing a leakage magnetic flux even in a constitution where the material to be heated itself serves as a magnetic core material so that the magnetic flux easily leaks outside, capable of obtaining a product with excellent quality and capable of contributing to an improvement of productivity. SOLUTION: A turn of a short circuit ring coil 9 is provided in an opening part 3 of an inductor 6 to surround a thick plate 1 to be heated. The short circuit ring coil 9 is made of a conductive member such as copper and has an upper edge part 10 and a lower end part 11 which are extended in parallel with a conveyance direction of the thick plate 1 to be heated. The short circuit ring coil 9 generates counter magnetomotive force against an internal penetration magnetic flux to substantially reduce the magnetic flux penetrating the thick plate 1 to be heated. Thereby, even if the thick plate 1 to be heated is made of a ferromagnetic material, the magnetic flux leaking from the thick plate 1 to the outside can be suppressed. COPYRIGHT: (C)2006,JPO&NCIPI
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