EP 0401068 A1 19901205 - Impregnated thermionic cathode for electron tube.
Title (en)
Impregnated thermionic cathode for electron tube.
Title (de)
Imprägnierte thermiorische Kathode für Elektronenröhre.
Title (fr)
Cathode thermo-électronique imprégnée pour tube électronique.
Publication
Application
Priority
FR 8907084 A 19890530
Abstract (en)
Cathode comprising a matrix (4) made of a porous material impregnated with an emissive product (aluminates of barium and of calcium). The porous body (4) is covered with a layer (5) of a non-porous refractory material and has prescribed porosity thanks to a set of narrow slots (6) obtained by etching. This layer is advantageously obtained by chemical vapour-phase deposition (C.V.D.) and has a thickness of the order of one to several hundred micrometres. <IMAGE>
IPC 1-7
IPC 8 full level
H01J 1/28 (2006.01)
CPC (source: EP)
H01J 1/28 (2013.01)
Citation (search report)
- [Y] US 4379979 A 19830412 - THOMAS RICHARD E, et al
- [Y] US 2864028 A 19581209 - COPPOLA PATRICK P
- [AD] EP 0052047 A1 19820519 - THOMSON CSF [FR]
- [X] INTERNATIONAL ELECTRON DEVICES MEETING, INSTITUTE OF ELECTRICAL & ELECTRONICS ENGINEERS, IEDM'83, Washington, 5-7 décembre 1983, pages 448-451, IEEE, New York, US; L.R. FALCE: "Dispenser cathodes: the current state of the technology"
- [A] INTERNATIONAL ELECTRON DEVICES MEETING, INSTITUTE OF ELECTRICAL & ELECTRONICS ENGINEERS, Washington, 4-6 décembre 1978, pages 156-159; L.R. FALCE et al.: "Controlled porosity dispenser cathode: iridium-barium oxide"
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0401068 A1 19901205; FR 2647952 A1 19901207; JP H0317929 A 19910125
DOCDB simple family (application)
EP 90401216 A 19900507; FR 8907084 A 19890530; JP 14121490 A 19900530