Microwave oven having a source of infra-red radiation
AssigneeThorn EMI Appliances Limited
InventorsGeoffrey I. Bell, Peter W. Crossley, Alex L. Halberstadt, Stephen J. Newton, Susan M. Crocker
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Abstract
A microwave oven consists of an oven cavity containing a turntable, a source of microwave energy and a waveguide for directing microwave energy into the oven cavity. Two lamp units accommodate tungsten-halogen lamps for browning food cooked by the microwave energy. To inhibit arcing through the lamps due to exposure to the microwave energy, support coils supporting the filament of each lamp are each formed from an incomplete turn of the coil to inhibit arcing between adjacent regions thereof. Other modifications to the lamps and/or the units may also be provided to protect the lamps from exposure to the microwave energy.
Claims7
A microwave oven comprising a source of microwave energy and at least one source of infra-red radiation, said at least one source of infra-red radiation including an infra-red emissive lamp comprising a halogenated tubular envelope having an internal surface, a tungsten filament and a number of spaced support members supporting the tungsten filament on, or adjacent to, a longitudinal axis of the envelope wherein each said support member consists of a coil of wire of which one part only bears against said internal surface of the envelope and the remaining portion is attached to the filament and extends to said internal surface, said one part extending part-way only around said longitudinal axis of the envelope so as to make an incomplete turn about said axis and thereby inhibit arcing between adjacent regions of the coil during exposure thereof to microwave radiation.
Dependencies are inferred from the claim text.