Matsushita Electric Industrial Co., Ltd.

Kyocera Corporation

Yoshihiro Toda

Kimiaki Yamaguchi

Masahiro Nitta

Kazuyuki Inoue

Teruo Hirose

Youichiro Honda

A circuit board includes an insulating substrate having a first surface and a second surface opposite to the first surface, a solid conductor located inside the insulating substrate, a first via conductor connected to the solid conductor from a side of the first surface, and a second via conductor connected to the solid conductor from a side of the second surface. The solid conductor has a cutout that intersects a line segment that connects a node of the first via conductor and a node of the second via conductor to each other.

Circuit board and probe card

A high frequency heating device includes a high frequency oscillator, a heating chamber for accommodating an object to be heated, and a cylindrical wave guide for coupling the high frequency oscillator to the heating chamber. The output antenna for the high frequency oscillator is disposed at an input end portion of the cylindrical wave guide and along the center axis of the wave guide. The heating chamber has a wall which is coupled to the cylindrical wave guide, the wall being positioned in an end plane of the cylindrical wave guide opposite to the output antenna. An arcuate slit is formed in the wall with the center of curvature of the slit being centered at the center axis of the cylindrical wave guide. This construction suppresses higher harmonics, and furthermore impedance matching and adjustment of the heating performance are facilitated.

High frequency heating device having an energy feed system including a

An electromagnetic energy seal for use in a microwave oven comprises a first sealing cavity formed along at least one of a peripheral edge portion of an entrance opening of a heating chamber and a portion of a door for opening and closing the entrance opening of the heating chamber which is opposite to the peripheral edge portion of the entrance opening of the heating chamber, and a second sealing cavity disposed in the opening of the first sealing cavity. These first and second sealing cavities have a simple structure which produces high shield effects against the fundamental microwave frequency and the higher harmonic microwave frequency components thereof, respectively, and the adjustment and optimization of the choking frequency characteristics of the cavities can be made easy.

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Kyoto, Japan

Yoshihiro Toda