Cooking appliance and method with a light sensor

Details Cooking appliance and method with a light sensor Cooking appliance and method with a light sensor

1993-06-04

1994-11-29

Leung, Philip H.

Electric heating

Microwave heating

With control system

219685, 219763, 219518, 219502, 99325, H05B 668

Patent

active

053692527

ABSTRACT:
A microwave oven has a photosensor to detect an objected in a cooking compartment. The photosensor, including a light emitter and a light receiver, detects whether a turntable is absent or present in the cooking compartment. The light emitter projects a plurality of pulses of light in sequence. A controller counts the number of pulses of light detected by the light receiver and controls the oven based on the number of pulses of light detected as compared to the number of pulses of light emitted.

REFERENCES:
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patent: 4187545 (1980-02-01), Wallace et al.
patent: 4195522 (1980-04-01), Anderson et al.
patent: 4426572 (1984-01-01), Tachikawa et al.
patent: 4591708 (1986-05-01), Shu
patent: 4868357 (1989-09-01), Serikawa et al.
Patent Abstracts of Japan, vol. 15, No. 143, (E-1054) Jan. 1991, JP3020990.
Patent Abstracts of Japan, vol. 13, No. 591, (M-913) Oct. 1989, JP1247915.
Patent Abstracts of Japan, vol. 13, No. 13, (M-783) Sep. 1988, JP63223423.

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