F - Mech Eng,Light,Heat,Weapons – 24 – C
Patent
F - Mech Eng,Light,Heat,Weapons
24
C
327/2.51
F24C 7/02 (2006.01) H05B 6/68 (2006.01) H05B 6/80 (2006.01)
Patent
CA 1142602
Abstract of the Disclosure A microwave oven comprising a magnetron emitting microwaves, a heating chamber body holding food being heated, an infrared transmitting section to transmit infrared rays from the food being formed in the top wall of the heating chamber body, infrared detecting means disposed over the infrared transmitting section, the infrared detecting means including a horn member disposed at the upper portion of the infrared transmitting section and formed of material capable of cutting off microwaves, the horn member having a hollow which extends toward the heating chamber body, has its diameter increasing toward the heating chamber body, and has its minimum opening size smaller than the wavelength of microwaves, and an infrared detecting element to detect infrared rays condensed by the hollow, the hollow having a spread angle so set that only infrared rays emitted from the food being heated may be allowed to be applied to the infrared detecting element and that infrared rays emitted from other regions than the food may be returned after repeated reflection within the hollow, and a processing circuit for calculating the temperature of the food being heated on the basis of a detection signal provided by the infrared detecting means.
363488
Fukuda Norisuke
Mori Leo
Ridout & Maybee Llp
Tokyo Shibaura Denki Kabushiki Kaisha
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