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US 4,053,807 AGranted
Thermionic cathode and heater structure on ceramic base plate
AssigneeSony Corporation
InventorsTorao Aozuka, Akio Ohkoshi, Shoichi Muramoto, Akira Nakayama, Koichiro Sumi
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Abstract
A thermionic cathode structure includes a ceramic base plate, a heater layer of tungsten coated on the ceramic base plate, a cathode lead layer of tungsten formed on a ceramic insulating layer covering the heater layer, a base metal layer coated on the cathode lead layer, and a cathode material coated on the base metal layer.
Claims10
A thermionic cathode structure, comprising:
- a. a ceramic base plate;
- b. a heater layer of tungsten coated on a predetermined area of said ceramic base plate;
- c. a ceramic insulating layer coated on said ceramic base plate and covering said heater layer;
- d. a cathode lead layer of tungsten coated on a portion of said ceramic insulating layer superposed over said area of the ceramic base plate;
- e. a base metal layer coated on said cathode lead layer;
- and
- f. a cathode material coated on said base metal layer, said heater layer, ceramic insulating layer, cathode lead layer, base metal layer and cathode material forming a cathode member.
4 more elements
Dependencies are inferred from the claim text.