Partition and front wall forming choke structure for a microwave oven

Claim 1

High-frequency heating equipment comprising a. a heating chamber having top and front walls, said front wall having an access opening therein, b. means for generating electromagnetic waves and transmitting the generated electromagnetic waves into said heating chamber, c. a partition wall secured to the top wall of said heating chamber and positioned substantially parallel to said front wall, the length of the front wall facing said partition wall being equal approximately to an odd number times one-quarter of the fundamental wavelength of the electromagnetic waves generated by said generating means, and d. a door for closing the access opening in the front wall of said heating chamber, said door having a cavity in the outer peripheral portion thereof defined by a forward member, spaced upper and lower members extending substantially perpendicular to said forward member, and an inner member positioned substantially parallel to and spaced from said forward member and, when said door is closed, substantially parallel to and spaced from the front wall of said heating chamber, a gap being formed between said inner and upper members, the total distance defined by the length of said inner member opposing said front wall added to the length of said inner member between said lower member and said gap being equal approximately to an integer times one-half of the fundamental wavelength of said electromagnetic waves, the space defined by said front wall and inner member and by said cavity comprising a first electromagnetiC wave labyrinth and the space defined by said partition, top and front wall comprising a second electromagnetic wave labyrinth.