Sanyo Electric Co., Ltd.

Kuniyasu Kubo

Yoshiharu Omori

Katsuaki Hayami

Takashi Fukuda

Yuichi Otsuki

Eiji Fukunaga

Yoshihito Fukuda

Chizuko Konishi

Yoshihiro Wada

Yoshitsugu Kawamura

Ryota Isshiki

Yukihiro Kitada

Hideo Fujii

Yoshitsugu Takada

Microwave heating device

An opening is formed in a right side of a heating chamber. The opening is covered by a protection cover. A waveguide is connected to the opening. A magnetron is connected to the waveguide. The magnetron has a magnetron antenna. An emission antenna is arranged around the magnetron antenna. A rotating plate is mounted to the protection cover. A plurality of diffusion antennas are mounted to the rotating plate. The diffusion antennas are arranged from the waveguide to the heating chamber.

Microwave oven including antenna for properly propagating microwaves oscillated by magnetron

A microwave oven includes a cavity in which food is accommodated, a magnetron for generating microwaves, and a waveguide to supply microwaves generated from the magnetron into the cavity. The waveguide has substantially a truncated cone configuration in which the cross sectional area at the cavity side is greater than the cross sectional area at the magnetron side, and an output antenna of the magnetron is disposed to project from the bottom of the waveguide at the magnetron side into the inner space of the waveguide. The microwave oven further includes a flat radiation antenna fixed in the inner space of the waveguide around the output antenna of the magnetron while maintaining distances from the waveguide and the output antenna of the magnetron in which no spark is generated. Therefore, the radiation area for emitting the microwaves is increased significantly to improve heating nonuniformity within the cavity.

Microwave oven including antenna for radiating microwave

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Kusatsu, Japan

Kuniyasu Kubo