EP 0162673 A2 19851127 - Improvements in tungsten halogen incandescent lamps.
Title (en)
Improvements in tungsten halogen incandescent lamps.
Title (de)
Wolframhalogenglühlampen.
Title (fr)
Lampes à incandescence à tungstène-halogène.
Publication
Application
Priority
GB 8412842 A 19840519
Abstract (en)
A tungsten halogen incandescent lamp having a filament support structure made of molybdenum and a filament shield, also of molybdenum, to provide an assymetric passing beam in an automobile headlight. When operating with the halogen bromine small changes in the design or positioning of the shield can be critical and can cause darkening. This can be prevented by applying a small amount of the metal platinum to the back of the shield by plating, by means of a paste or in any convenient manner. In a specific example 13 microgrammes of platinum were used in a 55-60W H4 automobile headlight having a fill of bromine and krypton.
IPC 1-7
IPC 8 full level
H01K 1/26 (2006.01); H01K 1/54 (2006.01); H01K 1/56 (2006.01); H01K 9/08 (2006.01)
CPC (source: EP)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0162673 A2 19851127; EP 0162673 A3 19870422; GB 8412842 D0 19840627; JP S60254552 A 19851216
DOCDB simple family (application)
EP 85303466 A 19850517; GB 8412842 A 19840519; JP 10417485 A 19850517