Heater cover for microwave ovens using light wave heaters

Details Heater cover for microwave ovens using light wave heaters Heater cover for microwave ovens using light wave heaters

1999-08-30

2000-11-28

Leung, Philip H.

Electric heating

Microwave heating

With diverse-type heating

219738, 219756, H05B 676

Patent

active

061538671

ABSTRACT:
A heater cover for microwave ovens using halogen heaters in addition to magnetrons is disclosed. The above heater cover is designed to have an optimal opening ratio while effectively protecting the halogen heaters from microwaves and having a desired structural strength. On the heater cover, a plurality of perforations are formed along a plurality of rows with both the same interval between the perforations and a radius "r" of each perforation being three times or more of the interval. The interval between horizontal phantom lines, passing through the centers of the perforations arranged on the rows, is shorter than the diameter "2r" of each perforation. The relation between the radius "r" of each perforation and the wavelength ".lambda." of microwaves is expressed by the expression, .lambda./64 .ltoreq.2r .ltoreq..lambda./8. The interval between the perforations ranges from 0.5 mm to 2 mm.

REFERENCES:
patent: 4051341 (1977-09-01), Tanaka et al.
patent: 5313036 (1994-05-01), Chartrain et al.
patent: 5406057 (1995-04-01), Komatsu et al.

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