Electric heating – Microwave heating – With control system
Patent
1993-09-08
1995-06-06
Leung, Philip H.
Electric heating
Microwave heating
With control system
219518, 177210C, H05B 678
Patent
active
054224640
ABSTRACT:
A food weight sensing device of a microwave oven using a variable capacitor of which the capacitance is varied in accordance with pressure applied thereto. The device comprises of first and second electrodes placed on a side portion of a lower surface of a cooking chamber, the side portion being included in a rotating trail of a roller applied with part of the food weight, each of the electrodes comprising a metal plate spring. A spacer is interposed between the first and second electrodes to space out the electrodes from each other at a predetermined interval. A rubber plate engages with the first electrode for transmitting the food weight to the first electrode. The first electrode comprises a center circular push part, an outer flange part and at least two arcuate ribs connecting the center circular push part to the outer flange part. The spacer is made of a metal so as to electrically connect the first electrode to a printed circuit board. This device precisely and easily senses the food weight by sensing a varied capacitance of the variable capacitor.
REFERENCES:
patent: 4825967 (1989-05-01), Sakamoto et al.
patent: 4875533 (1989-10-01), Mihara et al.
patent: 4970374 (1990-11-01), Ueda et al.
patent: 5050034 (1991-09-01), Hegner et al.
Goldstar Co. Ltd.
Leung Philip H.
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