Mitsubishi Denki Kabushiki Kaisha

Kiyoshi Saitou

Akira Yamada

Keiji Fukuyama

Hisao Watarai

Takuya Ohira

Hiroyuki Teramoto

Toshihisa Honda

Yoshikazu Utsumi

A cathode for an electron tube provided with a base containing at least one kind of reducing agent, a metal layer whose main component is tungsten formed on the base, and an electron emission material layer whose main component is an alkaline-earth metal oxide including barium formed thereon, deformation of the base in operation is controlled by composing the metal layer with a porous metal layer and limiting the thickness and the porosity of the metal layer. As a result, it is possible to achieve a cathode for an electron tube applicable to a cathode-ray tube for a display in which the cutoff voltage is liable to change.

Cathode for electron tube

The present invention provides microwave ceramic dielectric materials having large relative dielectric constant, very large Q, and stable and small temperature coefficient. The ceramic dielectric materials of the present invention are expressed by the general formula:

Ceramic dielectric materials for microwave use and a method for

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Tokyo, Japan

Kiyoshi Saitou