Electric lamp and discharge devices – Electrode and shield structures – Indirectly heated cathodes
Patent
1987-08-10
1989-02-07
DeMeo, Palmer C.
Electric lamp and discharge devices
Electrode and shield structures
Indirectly heated cathodes
313346DC, H01J 128, H01J 1922
Patent
active
048033979
ABSTRACT:
A dispenser cathode such as a metal capillary cathode for electrical discharge devices which has a hollow cylindrical head portion 1 which carries a porous emission wafer 3 of a refractive material at its upper end and covers a cathode cartridge 2 which contains an active material supply 4 and comprises an epoxy helical heater 5 surrounded by a metal sleeve 6. Two part division of the structure allows separate testing possibility of the emission wafer and the heater/supply cartridge and also allows an improvement in the heat transmission from the heater to the emission wafer. For this purpose, a hollow cylindrical head portion 1 is conically-shaped and expands outwardly toward the cathode cartridge 2 and the upper part of the cathode cartridge 2 is conically tapered so as to mate with the hollow cylindrical head portion and the two portions are connected together wherein their conical side walls are attached by welding in the upper portion of the drawn up metal sleeve. The dispenser cathode can be used in travelling wave tubes for example.
REFERENCES:
patent: 2830218 (1958-04-01), Beggs
patent: 3676731 (1972-07-01), Hofmann et al.
patent: 3821589 (1974-06-01), Katz et al.
Abstract, vol. 9 No. 173 (E329) 1896 Jul. 18, 1985 Impregnated Type Cathode 60-47331.
Hauser Josef
Heynisch Hinrich
Hubner, deceased Erwin
DeMeo Palmer C.
Siemens Aktiengesellschaft
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