EP 0444591 A3 19911106 - METAL VAPOUR DISCHARGE LAMP
Title (en)
METAL VAPOUR DISCHARGE LAMP
Publication
Application
Priority
JP 4441490 A 19900227
Abstract (en)
[origin: EP0444591A2] Disclosed is a metal vapor discharge lamp having mercury and iron filled therein, in which the iron is prevented from depositing on the internal surface of the bulb of said lamp and forming a thin iron film. Namely, in the metal vapor discharge lamp according to this invention, the amount of thallium to be incorporated relative to iron is 1/200 to 1/2 in terms of gram atom number ratio, whereby formation of thin iron film can be prevented without affecting the spectrum outputs of mercury and iron.
IPC 1-7
IPC 8 full level
H01J 61/20 (2006.01); H01J 61/18 (2006.01)
CPC (source: EP)
H01J 61/18 (2013.01)
Citation (search report)
- [A] DE 3632430 A1 19870409 - USHIO ELECTRIC INC [JP]
- [A] FR 712075 A 19310924 - SIEMENS AG
- [A] PATENT ABSTRACTS OF JAPAN, vol. 1, no. 68, 4th July 1977, page 1171 M 77; & JP-A-52 16 887 (IWASAKI) 08-02-1977
Designated contracting state (EPC)
DE GB IT NL
DOCDB simple family (publication)
EP 0444591 A2 19910904; EP 0444591 A3 19911106; JP H03250549 A 19911108
DOCDB simple family (application)
EP 91102795 A 19910226; JP 4441490 A 19900227