EP 0477668 B1 19950419 - High pressure metal halide discharge lamp.
Title (en)
High pressure metal halide discharge lamp.
Title (de)
Metallhalogenid-Hochdruckentladungslampe.
Title (fr)
Lampe à décharge aux halogénures métalliques à haute pression.
Publication
Application
Priority
DE 4030202 A 19900924
Abstract (en)
[origin: EP0477668A1] In the high-pressure metal-halide discharge lamp (14) for stage, film and TV lighting systems, the discharge bulb (15) contains, in addition to mercury, at least one noble gas, caesium and dysprosium halide, in particular nickel halide and, optionally, gadolinium halide as filling. Advantageously, the bulb volume contains per cm<3> 0.03 to 3 mg of dysprosium, 0.002 to 0.5 mg of nickel and, optionally, 0.002 to 0.1 mg of gadolinium. The halogens used for the halide compounds are iodine and bromine in a molar ratio of between 0.2 and 1.5. The metals nickel and gadolinium limit the drop in colour temperature over the mean service life of the lamp (14) to not more than 1 K per operating hour. <IMAGE>
IPC 1-7
IPC 8 full level
H01J 61/18 (2006.01); H01J 61/20 (2006.01)
CPC (source: EP US)
H01J 61/20 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0477668 A1 19920401; EP 0477668 B1 19950419; DE 4030202 A1 19920326; DE 59105242 D1 19950524; JP H04249058 A 19920904; US 5264760 A 19931123
DOCDB simple family (application)
EP 91115371 A 19910911; DE 4030202 A 19900924; DE 59105242 T 19910911; JP 25438691 A 19910906; US 73206191 A 19910718