Apparatus for detecting the open or closed condition of a microw

Details Apparatus for detecting the open or closed condition of a microw Apparatus for detecting the open or closed condition of a microw

1990-12-28

1992-07-21

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055B, 219 1055D, H05B 668

Patent

active

051325039

ABSTRACT:
A door condition sensing apparatus for a microwave oven includes a mechanical switch and a photodetector, each of which is separately responsive to the closing of the door. A microprocessor receives signals from both the switch and the photo-detector to determine whether the door is closed. The photo-detector is actuated by a lever which is swung by the door as it closes. The lever comprises an actuator arm of a second switch connected to the microprocessor.

REFERENCES:
patent: 4638137 (1987-01-01), Kazumi
patent: 4760229 (1988-07-01), Steers et al.
patent: 4982063 (1989-01-01), Tsunekawa et al.

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