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US 7,733,026 B2Granted
Lamp with an improved lamp behaviour
AssigneeKoninklijke Philips Electronics N.V.
InventorsGerhard Hebbinghaus, Jozef Merx
Life of this patent
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Abstract
The invention relates to a Hg free high pressure discharge lamp having a quartz envelope and a halide filling, wherein the lamp comprises at least one electrode which comprises tungsten and ≧0 wt. % and ≦0.5 wt. % thorium and whereby the lamp comprises at least one Mo-containing lead-in wire and/or foil whereby the Mo containing wire and/or foil comprises TiO2 and having a characteristic life time of ≧2500 h and ≦7500 h according to the EU Carmaker cycle test.
Claims9
A Hg free high pressure discharge lamp having a quartz envelope and a halide filling, comprising:
- at least one electrode which comprises tungsten and 0.0001% and ≦0.5 wt.-% thorium;
- and
- at least one lead-in wire comprising molybdenum (Mo) and TiO2, or a foil comprising Mo and TiO2, or both.
Dependencies are inferred from the claim text.