Microwave oven door screen

Details Microwave oven door screen Microwave oven door screen

1976-05-03

1977-09-27

Grimley, Arthur T.

Electric heating

Metal heating

Of cylinders

174 35MS, H05B 906

Patent

active

040513416

ABSTRACT:
A structure of a microwave oven door screen which facilitates the observation of the inside of a heating cavity and enhances the safety against the electromagnetic wave leakage and durability. A door screen of this type generally comprises a pair of transparent plates and an electromagnetic wave shielding material interposed therebetween. The present door screen uses a punched metal plate as the electromagnetic shielding material made of aluminum having a thickness of 0.1 to 0.35 mm, an aperture diameter of 1.2 mm or less and a ratio of the aperture diameter to a center-to-center distance of an aperture of 0.67 to 0.85, these parameters being chosen such that an aperture rate of more than 40% is assured and the electromagnetic wave leakage through the door screen is effectively prevented (to meet the Regulations of U.S. Department of Health, Education, and Welfare) and a strain due to continuous mechanical treatment of the punched metal plate is minimized.

REFERENCES:
patent: 2920174 (1960-01-01), Haagensen
patent: 2958754 (1960-11-01), Hahn
patent: 3088453 (1963-05-01), Grahn et al.
patent: 3177334 (1965-04-01), Kinkle
patent: 4008383 (1977-02-01), Tanaka et al.
patent: 4010343 (1977-03-01), Tanaka et al.

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