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US 4,878,866 AGranted
Thermionic cathode structure
AssigneeDenki Kagaku Kogyo Kabushiki Kaisha
InventorsYoshiharu Mori, Suzuya Yamada, Mitsuaki Saito, Hirotoshi Hagiwara, Kenichi Ehara
Life of this patent
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Abstract
A thermionic cathode structure comprises two parallel thermionic electron emitter elements which are made of a heat resistant and electric conductive inorganic compound. Each of them has one end electrically closed and the other end functioning as a current feeding port.
Claims5
A method of making a thermionic cathode structure comprising the steps of:
- cutting by a wire cut method a heat resistant and electrically conducting inorganic tubular substrate such that two parallel thermionic electron emitting elements are formed in a reverse-helical manner which are arranged so that their emissive surfaces are parallel to each other and wherein one end of each said elements is connected to the one end of the other elements and providing current feeding ports on the remaining end of each of said elements.
A method of making a thermionic cathode structure selected from the group of a vortex form, a snaky form or a zig-zag form comprising the steps of:
- cutting a heat resistant and electrically conductive inorganic plate or disc by wirecut electric discharging;
- and attaching end parts of thus obtained thermionic cathode to supporting electrodes;
- and
- covering the current feeding ports with an insulating cover member at the terminal sections of said thermionic electron emitter elements.
1 more element
Dependencies are inferred from the claim text.