EP 0639848 B1 19970910 - Oxide cathode for electron tube
Title (en)
Oxide cathode for electron tube
Title (de)
Oxydkathode für Elektronenröhre
Title (fr)
Cathode à oxyde pour tube à électrons
Publication
Application
Priority
- KR 930016231 A 19930820
- KR 930021670 A 19931019
- KR 930022124 A 19931023
- KR 930022490 A 19931027
Abstract (en)
[origin: EP0639848A1] In an oxide cathode comprising a metal base, an electron emissive material layer containing at least Ba formed on the metal base, and a means for heating the electron emissive material layer, the electron emissive material layer further comprises at least one of a lanthanum oxide and a terbium oxide, and forms a needle-shaped crystal structure, or the electron emissive material layer further comprises at least one of a lanthanum oxide and a terbium oxide, and the metal base is subject to a heat treatment under vacuum. The oxide cathode has an effect on lengthening the lifetime, and has a manufacturing procedure interchangeable with a conventional one.
IPC 1-7
IPC 8 full level
H01J 1/14 (2006.01); H01J 1/144 (2006.01); H01J 1/20 (2006.01); H01J 9/04 (2006.01)
CPC (source: EP)
H01J 1/144 (2013.01)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0639848 A1 19950222; EP 0639848 B1 19970910; CN 1061462 C 20010131; CN 1099185 A 19950222; DE 69313845 D1 19971016; DE 69313845 T2 19980402; JP H0765692 A 19950310; SG 44617 A1 19971219; TW 259877 B 19951011
DOCDB simple family (application)
EP 93310036 A 19931213; CN 93121498 A 19931229; DE 69313845 T 19931213; JP 7484094 A 19940413; SG 1996004185 A 19931213; TW 82110980 A 19931224