EP 0254147 A3 19900321 - HOT CATHODE TYPE DISCHARGE LAMP APPARATUS
Title (en)
HOT CATHODE TYPE DISCHARGE LAMP APPARATUS
Publication
Application
Priority
- JP 10859486 U 19860715
- JP 10859686 U 19860715
Abstract (en)
[origin: EP0254147A2] Hot cathode type discharge lamp apparatus of the invention is composed of a tube for discharge lamp, a cathode electrode member in nearly cylindrical form made of a semiconductor porcelain and arranged within the tube and including a longitudinal circumferential surface made a discharge surface, and two lead wires connected to both longitudinal ends of the cathode electrode member and penetrating an end portion of the tube. In the discharge lamp apparatus, since an electron emission material is not used in the cathode electrode but the semiconductor porcelain is used, activation of the electron emission material due to heating is not produced, thereby blackening phenomenon of the tube wall of the discharge tube can be prevented and the life becomes long.
IPC 1-7
IPC 8 full level
H01J 61/06 (2006.01)
CPC (source: EP KR)
H01J 1/13 (2013.01 - KR); H01J 61/06 (2013.01 - EP KR)
Citation (search report)
- [X] US 3766423 A 19731016 - MENELLY R
- [X] US 2251045 A 19410729 - GEORG GAIDIES, et al
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0254147 A2 19880127; EP 0254147 A3 19900321; CN 1006343 B 19900103; CN 87104929 A 19880127; KR 880002216 A 19880429; KR 920001845 B1 19920305
DOCDB simple family (application)
EP 87109937 A 19870709; CN 87104929 A 19870715; KR 870006970 A 19870701