INDUCTION HEATER

摘要

An induction heater in which an electric conductor for reducing a buoyancy produced in an article being heated is provided with a central opening having a small diameter to reduce the buoyancy due to the increased area of the electric conductor. A pectinate part is provided around the opening in order to block a circulation-current flow generated in the electric conductor. Since the periphery of the opening is not heated abnormally even if a concave pot is used, a heating coil can ensure a high output over a long time.