Microwave oven door having a microwave shielding structure

Details Microwave oven door having a microwave shielding structure Microwave oven door having a microwave shielding structure

1995-12-11

1999-10-26

Leung, Philip H.

Electric heating

Microwave heating

Radiation protection

174 35GC, H05B 676

Patent

active

059733055

ABSTRACT:
A choke structure of microwave oven door which can effectively protect a human body by shielding the microwave leakage to outside is disclosed. The choke structure comprises a drawn side wall provided by bending from the sealing surface opposite to the front panel, a lower choke wall bent by extending outwards from an end of the drawn side wall, an outer choke wall bending by extending from an end of the lower choke wall toward the sealing surface, and an upper choke wall bent by extending from an end of the outer choke wall toward the drawn side wall. The length of the microwave transmission path is 1/4..lambda..sub.0 wherein, .lambda..sub.0 is the free space wavelength of microwave. The choke structure has a plurality of slits for dividing the choke structure into a plurality of chokes to form plural open longitudinal paths. The holes for reinforcing impedance are formed at portions of the lower choke wall opposite to the slits formed at the choke structure. A large impedance is formed in view of circuitry between the front panel of a cooking chamber and a sealing surface of a door frame contacted thereto. Thus, almost the leaked microwave disappears by short-circuiting at the inner surface of the final short longitudinal surface from the opening of the choke structure as a starting point.

REFERENCES:
patent: 3668357 (1972-06-01), Kobayashi
patent: 4645892 (1987-02-01), Gustafsson
patent: 4822968 (1989-04-01), Chin
patent: 4868359 (1989-09-01), Iwabuchi et al.
patent: 5206478 (1993-04-01), Lee

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