Tdk Corporation

Hiraku Harada

Katsuhiko Wakayama

Makoto Takahashi

Dai Matsuoka

Masatada Yodogawa

Munemitsu Hamada

Akira Takeishi

Takaya Ishigaki

Yoshikazu Fujishiro

An electron-emitting electrode for discharge lamps etc. uses an electron-emitting material which contains a first metal component selected from Ba, Sr and Ca and a second metal component selected from Ta, Zr, Nb, Ti and Hf and also contains oxynitride perovskite. The electron-emitting material has restrained evaporation during electric discharge and a high resistance to ion sputtering.

Electrode

An electron-emitting material contains a first metal component selected from Ba, Sr and Ca and a second metal component selected from Ta, Zr, Nb, Ti and Hf and also contains oxynitride perovskite. The electron-emitting material has improved electron emission characteristics, restrained evaporation at elevated temperatures, and minimized consumption by ion sputtering. The electron-emitting material is prepared by firing a metal component-containing raw material disposed in proximity to carbon in a nitrogen gas-containing atmosphere to thereby create oxynitride perovskite.

Electron-emitting material and preparing process

The invention decreases crosstalk due to capacitive coupling between through type capacitor elements in a multilayer through type capacitor array. On dielectric sheets between electrodes, which constitute a multi capacitor array, through-holes filled with conductive materials are formed, where a central conductor is not present. By electrically connecting conductive materials filled in the through-holes, electrostatic shielding is provided between the through type capacitor elements. Electrical connection is achieved through conductive layers formed outside or inside the through type capacitor elements.

Multilayer through type capacitor array

A magnetic fluid comprising metal fine particles of iron, 50 to 100 wt % of the metal particles of a surface-active agent selected from phospholipids, and 100 to 800 wt % of the metal particles of a medium in the form of a diester of an aliphatic dicarboxylic acid exhibits remarkably high saturation magnetization.

Magnetic fluid

A magnetic fluid comprising metal fine particles of cobalt, a nonionic or oil-soluble anionic surface-active agent, and a low-volatile solvent exhibits remarkably high saturation magnetization.

Magnetic fluid and process for preparing the same

A magnetic fluid comprising metal fine particles of cobalt, 25 to 60% based on the weight of the metal particles of a surface-active agent selected from the group consisting of polyglycerine fatty acid esters, sorbitan fatty acid esters, and mixtures thereof, and 50 to 250% based on the weight of the metal particles of a low boiling hydrocarbon medium exhibits remarkably high saturation magnetization.

Growing community of inventors

Tokyo, Japan

Hiraku Harada