Microwave oven comprising a defrosting detector

Details Microwave oven comprising a defrosting detector Microwave oven comprising a defrosting detector

1988-10-17

1989-09-26

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055E, 374149, H05B 668

Patent

active

048702340

ABSTRACT:
A microwave oven which includes a defrosting detector in the oven cavity in the proximity of a frozen product to be defrosted, the detector including a material which absorbs microwave energy, the absorption of microwave energy by the detector and by the product causing their temperatures to rise. Variations in the detector temperature are measured by a measuring element producing an electrical signal corresponding thereto, such signal being used to control the defrosting process. The microwave absorbent material is in the form of a layer deposited on a carrier which is positioned behind the product so that most of the detector area can only receive microwave energy through the product, whereby the rate of change of detector temperature with time decreases as the product defrosts and becomes constant when defrosting has been completed. The carrier may be one of the walls of the oven cavity or the oven tray. The material may be a resistive ink deposited on the oven tray by screen-process printing.

REFERENCES:
patent: 3527915 (1970-09-01), Haagensen et al.
patent: 4093841 (1978-06-01), Dills
patent: 4162381 (1979-07-01), Buck
patent: 4341937 (1982-07-01), Staats

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