EP 0461990 B1 19941019 - Micropoint cathode electron source.
Title (en)
Micropoint cathode electron source.
Title (de)
Elektronenquelle mit Mikropunktkathoden.
Title (fr)
Source d'électrons à cathodes émissives à micropointes.
Publication
Application
Priority
FR 9007347 A 19900613
Abstract (en)
[origin: JPH04229922A] PURPOSE: To prevent an electric breakdown without increasing the thickness of a resistance coating material in an electron emission source which has a microdot discharge cathode. CONSTITUTION: Since a lattice-like negative electrode is used so that the negative electrode and the related resistance coating material may be arranged in almost the same surface, a breakdown resistance does not depend on the thickness of a resistance coating material 7, but depends on the distance between a cathode conductor 5 and microdots 12. Therefore, an adequate distance is kept between the cathode conductor 5 and microdots 12 to prevent the resistance breakdown, and, meanwhile, the resistance coating material 7 keeps a uniformity effect of an electron emission.
IPC 1-7
IPC 8 full level
H01J 1/30 (2006.01); H01J 1/304 (2006.01)
CPC (source: EP KR US)
H01J 1/3042 (2013.01 - EP US); H01L 29/40 (2013.01 - KR); H01J 2201/319 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE GB IT LI NL SE
DOCDB simple family (publication)
EP 0461990 A1 19911218; EP 0461990 B1 19941019; DE 69104653 D1 19941124; DE 69104653 T2 19950504; FI 912802 A0 19910611; FI 912802 A 19911214; FR 2663462 A1 19911220; FR 2663462 B1 19920911; JP 2657984 B2 19970930; JP H04229922 A 19920819; KR 100204327 B1 19990701; KR 920001744 A 19920130; US 5194780 A 19930316
DOCDB simple family (application)
EP 91401536 A 19910611; DE 69104653 T 19910611; FI 912802 A 19910611; FR 9007347 A 19900613; JP 13895991 A 19910611; KR 910009509 A 19910610; US 70368491 A 19910531