Microwave oven with a door-closing safety device

Details Microwave oven with a door-closing safety device Microwave oven with a door-closing safety device

1987-05-21

1988-07-26

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1055C, 219 1055B, 126197, 324 96, H05B 676

Patent

active

047602295

ABSTRACT:
A microwave oven with a door-closing safety device is provided wherein a movable door comprises a device wherein the beam of at least one light emitter is guided by means of light guides towards a light beam detector. The light guides are arranged along a substantial portion of at least one side of the oven door frame. The beam of light in its non-guided path between the emitter and the detector passes through diaphragms, integral with the oven door, each diaphragm having an aperture such that the light beam passes through it when the door is properly closed but wherein the light beam is intercepted by the edge of the diaphragm when the door is not properly closed. The detector activates a signal that actuates the magnetron when the light beam is received; however, when the beam is intercepted, activation of the magnetron is prevented thereby preventing leakage of microwave energy.

REFERENCES:
patent: 3604783 (1971-09-01), Roth
patent: 3746824 (1973-07-01), Prucha
patent: 3955060 (1976-05-01), Laszlo
patent: 4065655 (1977-12-01), Wong et al.
patent: 4371869 (1983-02-01), Davidson
patent: 4565967 (1986-01-01), Eisenbrandt et al.

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