EP 0506182 A3 19921230 - HIGH PRESSURE GAS DISCHARGE LAMPS
Title (en)
HIGH PRESSURE GAS DISCHARGE LAMPS
Publication
Application
Priority
US 67693091 A 19910328
Abstract (en)
[origin: EP0506182A2] An improved high pressure gas discharge lamp. The lamp contains a standard arc tube (10) having electrodes (13) disposed at each end. The outer surface of at least one end of the arc tube is coated with a layer (14) of high radiative emissive material such as graphite or carbon. The coating serves to increase the radiative output of the arc tube at its so-called cold spot so as to cool the cold spot. The coating greatly decreases the voltage variation from lamp to lamp and permits manufacture of lamps within tighter voltage tolerances than have hitherto been achieved. <IMAGE>
IPC 1-7
IPC 8 full level
H01J 61/24 (2006.01); H01J 61/30 (2006.01); H01J 61/35 (2006.01); H01J 61/52 (2006.01)
CPC (source: EP)
H01J 61/24 (2013.01); H01J 61/35 (2013.01); H01J 61/523 (2013.01)
Citation (search report)
- [YD] US 3842304 A 19741015 - BEYER L, et al
- [A] EP 0366187 A1 19900502 - PHILIPS NV [NL]
- [Y] PATENT ABSTRACTS OF JAPAN vol. 005, no. 141 (E-073)5 September 1981 & JP-A-56 078 058 ( MITSUBISHI ) 26 June 1981
- [A] PATENT ABSTRACTS OF JAPAN vol. 012, no. 146 (E-605)6 May 1988 & JP-A-62 262 357 ( MITSUBISHI ) 14 November 1987
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
EP 0506182 A2 19920930; EP 0506182 A3 19921230; EP 0506182 B1 19960911; CA 2063961 A1 19920929; DE 69213523 D1 19961017; DE 69213523 T2 19970313; JP H07169442 A 19950704
DOCDB simple family (application)
EP 92200786 A 19920319; CA 2063961 A 19920325; DE 69213523 T 19920319; JP 6708292 A 19920325