HIGH FREQUENCY HEATING DEVICE

摘要

PURPOSE: To uniformly heat a part to be heated on the whole by switching an opening easily passing electromagnetic wave and an opening hardly passing of a plurality of openings by the rotation of a rotating body so that the electric fields apparently generated from various feed points can be frequently switched. CONSTITUTION: An electromagnetic wave emitted from a magnetron 1 heats a food 5 on a turn table 4 within a heating chamber 3 through a waveguide 2. A plurality of opening parts 6 for guiding the electromagnetic wave from the waveguide 2 to the heating chamber 3 are covered with a transparent opening cover 7 consisting of a material with low loss which hardly absorb the electromagnetic wave. A metallic stirrer blade 8 is provided as a rotating body within the waveguide 2, and rotated by a stepping motor 9. Since the blade 8 has various operating patterns according to purposes, the moving distance from a standard point is regularly monitored by a blade position detector 10. A control part 11 switches the openings by the oration of the rotating body so that electric fields apparently generated from various feed points can be frequently switched.