HIGH-FREQUENCY HEATING COIL OF INDUCTION HEATER

PROBLEM TO BE SOLVED: To provide an induction heater that does not cause the counterbalance among induced currents generated on an irregular-surfaced workpiece and can therefore efficiently and uniformly harden the workpiece. SOLUTION: A high-frequency coil 1 has a plurality of workpiece opposition parts 3 that approach a workpiece and generate induced currents on the workpiece and in which the workpiece opposition parts 3 are arranged in parallel with each other and each pair of specified workpiece opposition parts 3 are linked together through a link part 4, and the workpiece opposition parts 3 and the link parts 4 constitutes a series of electrical circuits as a whole. The high-frequency coil 1 has concurrent juxtaposition parts 11 where the currents on the adjoining workpiece opposition parts are concurrent and countercurrent juxtaposition parts 12 where the currents are countercurrent under conditions that a direct current is passed through the high-frequency heating coil 1. The distance between the workpiece opposition parts in the countercurrent juxtaposition part 12 is wider than that between the workpiece opposition parts in the concurrent juxtaposition parts 11, and there are two or more concurrent juxtaposition parts 11. COPYRIGHT: (C)2009,JPO&INPIT