Patent ID: 8831500
Filing Date: 2014-09-09
Classification: G03G,H05B

Abstract:
1. A microwave heating device comprising: a microwave generating portion outputting a microwave; a conductive heating chamber into which the microwave is led and having a short-circuited terminal end in a traveling direction of the microwave; a tuner provided between the microwave generating portion and the heating chamber; and an electric field transformer which is a high dielectric having a higher dielectric constant than air, the transformer having a width more than (4N−3)λg′/8 and less than (4N−1)λg′/8 where λg′ is the wavelength of a standing microwave in the high dielectric and N (N>0) is a natural number, the transformer being interposed in a position including a node of the standing microwave between the tuner and the heating chamber, wherein the heating chamber has an opening for passing a member to be heated therethrough in the heating chamber in a direction non-parallel to the traveling direction of the microwave, the tuner re-reflects the microwave reflected at the terminal end of the heating chamber onto the heating chamber side, the microwave output end of the microwave generating portion and the tuner are connected by a first square tubular waveguide made of a conductive material, and the tuner and the terminal end of the heating chamber are connected by a second square tubular waveguide, the waveguide being made of a conductive material except for the opening for passing the member to be heated therethrough.