F - Mech Eng,Light,Heat,Weapons – 24 – C
Patent
F - Mech Eng,Light,Heat,Weapons
24
C
240/100, 327/2.4
F24C 7/02 (2006.01) F21S 8/00 (2006.01) F24C 15/00 (2006.01) H05B 6/80 (2006.01)
Patent
CA 1215432
ABSTRACT: Illuminating arrangement in microwave ovens. An arrangement for illuminating the interior of a microwave oven cavity comprises a lamp (21) mounted in a lamp holder (19, 20) which is disposed outside the oven cavity behind a window in a cavity wall (10). The lamp holder (19, 20) is arranged axially within an elec- trically conductive sleeve (12) mounted on the outside of the cavity wall (10) and connected to cavity wall parts surrounding an aperture (11) in the cavity wall bounding the window so that the lamp (21) is axially ar- ranged within the sleeve (12). The sleeve (12) constitut- es a waveguide having the aperture (11) as input and hav- ing a cut-off wavelength smaller than the operating wave- length of the microwave oven, and the mounted lamp (21) has its filament (22) at a sufficient distance (H) from the aperture (11) for leaking microwave energy reaching the filament (22) to have been considerably attenuated. Microwave energy leakage is thereby substantially pre- vented both if the lamp (21) is mounted and if the lamp (21) is absent. The lamp (21) is readily accessible from the interior of the cavity for replacement.
450262
Almgren Per H.i.
Durne Christian
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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