EP 0421372 A3 19911121 - ELECTRON TUBE CATHODE AND METHOD OF ITS MANUFACTURE
Title (en)
ELECTRON TUBE CATHODE AND METHOD OF ITS MANUFACTURE
Publication
Application
Priority
JP 26236889 A 19891006
Abstract (en)
[origin: EP0421372A2] An electrode tube cathode (1) having improved electron emission properties is produced by suspending an alkaline earth metal carbonate powder and scandium oxide powder in a solution of nitrocellulose, regulating their particle size, applying the suspension on a nickel base metal surface (1b) such that the coating density is not greater than 2 mg/mm<3>, and heating the layer of the carbonate in vacuum to a temperature of 800 - 1200 DEG C to decompose to the oxide, thereby forming a porous electron emission layer (30) wherein scandium oxide is dispersed in an alkaline earth metal oxide on the base metal. The resultant electron emission layer (30) has a porous structure, and hence the stress between the layer and the base is reduced. This appears to suppress the swelling of the layer and the peeling of it away from the surface of the base.
IPC 1-7
IPC 8 full level
H01J 1/20 (2006.01); H01J 1/28 (2006.01); H01J 9/04 (2006.01); H01J 29/04 (2006.01)
CPC (source: EP KR)
H01J 1/14 (2013.01 - KR); H01J 1/28 (2013.01 - EP); H01J 9/042 (2013.01 - EP)
Citation (search report)
- [AD] EP 0204477 A1 19861210 - MITSUBISHI ELECTRIC CORP [JP]
- [A] US 2726178 A 19551206 - HERBERT NELSON, et al
- [A] US 4411827 A 19831025 - CORNEILLE DAVID M [US]
- [A] EP 0327074 A2 19890809 - MITSUBISHI ELECTRIC CORP [JP]
Designated contracting state (EPC)
DE FR NL
DOCDB simple family (publication)
EP 0421372 A2 19910410; EP 0421372 A3 19911121; EP 0421372 B1 19940914; DE 69012494 D1 19941020; DE 69012494 T2 19950126; JP H03127427 A 19910530; JP H0828183 B2 19960321; KR 910008766 A 19910531; KR 940009756 B1 19941017
DOCDB simple family (application)
EP 90118910 A 19901003; DE 69012494 T 19901003; JP 26236889 A 19891006; KR 900007760 A 19900529