| 摘要 |
There is provided an inductor for heating the inner circumference of a hole, by which induction heating of the inner circumference of a hole and so on can be realized rapidly and uniformly in the direction of the.circumference, and there is no risk of a short-circuit between a solenoidal coil and transition conductor passing therethrough. According to a configuration in which a magnetic core 12 with a cylindrical shape is arranged inside of a solenoidal coil 11a which forms the inductor 10, and a transition conductor 11c extending from one end of the solenoidal coil 11a to a feeding terminal through the inside of the solenoidal coil is arranged in an inserted manner into a hollow portion of the magnetic core 12, a risk of the short circuit is avoided by using an insulating material for the magnetic core 12, assuming that the magnetic core 12 with a large cross-sectional area is concentrically arranged in the solenoidal coil 11a.
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