Device for protecting the turntable shaft of microwave ovens fro

Details Device for protecting the turntable shaft of microwave ovens fro Device for protecting the turntable shaft of microwave ovens fro

1987-10-28

1989-01-24

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055D, H05B 678

Patent

active

048002461

ABSTRACT:
A device for protecting a turntable shaft in a microwave oven to prevent the turntable shaft, which is made out of a resinous material, from fusing during the operation of the microwave oven. A protective plate is formed on the lower surface of the turntable in such a manner that a supplementary cavity is formed having its impedance at a maximum at its inlet and a choke cavity is formed having its impedance at a minimum at its inlet. The phenomenon of microwaves concentrating around the shaft is eliminated by fixing the exact dimensional range of both cavities in accordance with the characteristics of the microwaves used.

REFERENCES:
patent: 4211909 (1980-07-01), Yoshida et al.
patent: 4591682 (1986-05-01), Takeuji
patent: 4595827 (1986-06-01), Hirai et al.

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