US 4,475,024 AGranted

Wireless food temperature-sensing assembly

AssigneeSharp Kabushiki Kaisha

InventorKoichi Tateda

Life of this patent

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Abstract

The present invention is directed to a cooking utensil such as a microwave oven wherein a food temperature-sensing probe is inserted into a foodstuff for detecting the internal temperature of the food. The food temperature-sensing probe includes a resonance circuit the resonance frequency of which varies depending on the internal temperature. A first signal generator is provided for delivering a series of signals which contain a variety of frequencies inclusive of the signals of the resonance frequency. A second signal generator is employed to provide sweeping signals for the series of signals developed from the first signal generator. A selecting circuit is connected to the second signal generator for selecting a particular value in the sweeping signals relevant to the desired temperature of the foodstuff. A wireless controlled circuit is provided which determines the occurence of the dip phenomena in a relationship with the particular value in the sweeping signals under the radiation of the series of signals generated from the first signal generator.

Claims10

Dependent claims

A microwave oven for varying the temperature of a foodstuff, comprising:

microwave generation means for heating said foodstuff by application of microwaves thereto;
resonance circuit means having a resonance frequency which varies in response to the temperature of said foodstuff;
first transmitter means for providing a series of driving signals inclusive of signals of the various resonance frequencies of said resonance circuit means;
second means for selecting a particular frequency of said series of driving signals corresponding to a desired set temperature of said foodstuff;
said transmitter means having a parameter which varies in response to a condition of resonance in said resonance circuit means;
third means, responsive to said second means and the variation in said parameter of said transmitter means for detecting the coincidence of said variation and a said particular driving signal frequency representative of said desired set temperature and providing an output signal in response thereto;
and
means responsive to said output signal for controlling said microwave generation means to heat said foodstuff to said desired set temperature.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/456,669Filed 10 Jan 1983 · continuation
Priority: JP 53-4246210 Apr 1978
Granted: 2 Oct 1984
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H05B 6/6482
Aspects related to microwave heating combined with other heating techniques: combined with radiant heating, e.g. infrared heating
G01K 1/024
Means for indicating or recording specially adapted for thermometers: for remote indication
G01K 5/62
Constrained so that expansion or contraction causes a deformation of the solid: the solid body being formed of compounded strips or plates, e.g.…
G01K 5/72
Specially adapted for indicating or recording: with electric transmission means for final indication