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US 4,184,100 AGranted
Indirectly-heated cathode device for electron tubes
AssigneeTokyo Shibaura Electric Co., Ltd.
InventorsYukio Takanashi, Sakae Kimura, Takashi Kuse, Toshiharu Matsuki
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Abstract
An indirectly-heated cathode device for electron tubes, comprising a hollow cathode sleeve of thin wall, a base metal mounted to one end of the sleeve and having the surface coated with an electron-emitting material, and a heater mounted within the sleeve. The sleeve is made of Ni-Cr alloy containing 2 to 35% by weight of Cr and predetermined amounts of additives including Co, W, Mo and/or Fe.
Claims15
An indirectly-heated cathode device for electron tubes comprising a hollow cathode sleeve having a thin wall;
- a base metal having a layer of electron-emitting materials formed on the surface thereof and provided at one end of the sleeve;
- and a heater disposed within the sleeve for heating the sleeve, the sleeve being made of an alloy consisting essentially of 2 to 35% by weight of chromium, an additive metal selected from the group consisting of cobalt, tungsten, molybdenum, and mixtures thereof, and the balance of nickel, the cobalt content when present ranging from 3 to 30% by weight, the tungsten content when present ranging from 0.5 to 15% by weight, the molybdenum content when present ranging from 0.5 to 15% by weight.
Dependencies are inferred from the claim text.