INDUCTION HEATING COIL, INDUCTION HEATING DEVICE, AND HEATING METHOD

摘要

An induction heating coil (3) provided with a primary coil (4) that is supplied with power, and an annular secondary coil (5) that forms a closed circuit. The primary coil (4) has a base end side that covers the outer periphery of the secondary coil (5), and a tip end side that is continuous with the base end side in the central axis direction of the secondary coil (5) when the secondary coil (5) is covered by the base end side. The width of the base-end side opening is greater than the width of the tip-end side opening. The secondary coil (5) can be inserted into and withdrawn from the interior of the primary coil (4) from the base end side of the primary coil (4).