Matsushita Electric Industrial Co., Ltd.

Yohzoh Ishimura

Okihiko Nakano

Toyotsugu Matsukura

Shinichi Sakai

Kazuho Sakamoto

Makoto Mihara

Toshiaki Kanaoka

A primary winding ( ) and a secondary winding ( ) are layered concentrically with a magnetic substance forming a main magnetic circuit ( ) and the magnetic resistance of a subordinate magnetic circuit ( ) placed between the primary winding ( ) and the secondary winding ( ) is adjusted, whereby a concentric multilayer winding transformer having an arbitrary coupling coefficient can be provided.

Magnetron drive step-up transformer and transformer of magnetron drive power supply

A high frequency heating apparatus has an oven-defining structure having an access opening in communication with a heating chamber defined therein, and a hingedly supported metallic door for selectively opening and closing over the access opening. The door has its peripheral area formed with a groove open towards the heating chamber. The bottom of the groove is situated frontwardly of the door with respect to the apparatus. An outerside wall extending from the groove is formed with a plurality of cutouts and a plurality of generally rectangular openings alternating with the cutouts. Each of the cutouts and each of the rectangular openings have one edge positioned on one side of a setup portion, protruding from the bottom of the groove, adjacent the oven-defining structure. The outer wall has a portion bent to protrude transversely into the groove to define a partitioning wall.

Door assembly for microwave heating apparatus

In a microwave heating oven, a safety switch 301 is disposed in an external position relative to a heating chamber 100. A displacement rod 302, which is made of polyprophylene or the like low dielectric constant plastic substance, is disposed through and across the heating chamber 100. Displacement rod 302 serves as a thermal switch, so that at an abnormally high temperature displacement rod 302 melts down, thereby opening the safety switch 301 and disengaging the microwave generator.

Combination thermal and mechanical safety switch for microwave heating

Fail-safe device for use in a heating apparatus

Growing community of inventors

Kashihara, Japan

Yohzoh Ishimura