Heat cooking apparatus with photoconductive element and thermist

Details Heat cooking apparatus with photoconductive element and thermist Heat cooking apparatus with photoconductive element and thermist

1991-03-11

1992-12-08

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055E, 219494, 219504, 374131, 374149, 99325, H05B 668

Patent

active

051700247

ABSTRACT:
A heat cooking apparatus arranged to cook a food article through heating by projecting microwave energy generated by a magnetron and heat rays produced by an electric heating unit onto the food article placed in a heating chamber, and including a light source for projecting visible light rays onto the food article, a photo-detector for detecting a light amount of the visible light rays reflected by the food article, a temperature sensor for detecting temperature within the heating chamber, and a control unit which monitors variation with time of detection signals from the photo-detector and the temperature sensor during heating of the food article by the electric heating unit and controls to complete the heating of the electric heating unit by judging that the heating is to be terminated when the detection signal of the photo-detector is reduced by a predetermined value from a maximum value, and the detection signal of the temperature sensor is increased by a predetermined value from an initial value.

REFERENCES:
patent: 4220840 (1980-09-01), Barker
patent: 4426572 (1984-01-01), Tachikawa et al.
patent: 4433232 (1984-02-01), Tachikawa et al.
patent: 4488026 (1984-12-01), Tanabe
patent: 4499357 (1985-02-01), Kojima
patent: 4734553 (1988-03-01), Noda

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