U.S. Philips Corporation

Jan Olov Appelquist

Kurt H Carlsson

Frans C De Ronde

Conny Holger Lindwall

Bengt U Imberg

An energy supply arrangement for feeding microwave energy from a microwave source to the oven cavity of a microwave oven. The energy supply arrangement comprises a transmission line of the type having a conductor arranged at a small distance from a ground plane, a so-called micro-strip line. This micro-strip line is arranged within the oven cavity near the bottom wall and is, for example, in the shape of a spiral conductor disposed about a central energy feed point and dimensioned such that it radiates energy into the cavity at the same time that energy propagates along the line.

Microwave oven

A safety interlock system for microwave ovens comprising first and second interconnected switches activated by the oven door. Each switch has make-and-break contacts. The first switch interrupts the current to the microwave source when the door is opened and the second switch monitors the operation of the first switch. The switches are connected in series with a fuse so that a malfunction of either of the switches makes the oven immediately unusable. A delay element is connected within one switch and the first switch is arranged to operate before the second switch when the door is initially opened. The delay element is a negative temperature coefficient (N.T.C) resistor.

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Norrkoping, Sweden

Jan Olov Appelquist