Microwave oven door screen

Details Microwave oven door screen Microwave oven door screen

F - Mech Eng,Light,Heat,Weapons

24

C

327/2.3

F24C 7/02 (2006.01) H05B 6/76 (2006.01)

Patent

CA 1040716

MICROWAVE OVEN DOOR SCREEN ABSTRACT OF THE DISCLOSURE 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 trans- parent plates and an electromagnetic wave shielding material interposed therebetween. The present door screen uses a punched metal plate as the electro- magnetic 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 apertures 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.

252669

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