Title:
THORIUM-FREE ELECTRODE WITH IMPROVED COLOR STABILITY
Document Type and Number:
WIPO Patent Application WO/2004/105082
Kind Code:
A2
Abstract:
The present invention relates to an electrode (4) comprising thorium as a minor
component for a high-pressure discharge lamp, a high-pressure discharge lamp,
and a method of manufacturing therefore. The electrode (4) or the present invention
can be used for a high pressure discharge lamp, whereby - the electrode rod(l)
is free of thorium, preferably thorium oxide, or comprises thorium, preferably
thorium oxide, as a minor constituent, - a covering member (5) made of refractory
metal, free of thorium, preferably thorium oxide, is circumference coated on
said electrode rod(l) in a vicinity of the discharge side tip (3), whereby the
entire surface of the electrode rod(l) is completely coated over the range the
covering member (5) extends, - the electrode rod tip (3) of said electrode rod
Inventors:
HAACKE MICHAEL (DE)
DEPREZ FRANCIS MARTIN JOZEF (DE)
DEPREZ FRANCIS MARTIN JOZEF (DE)
Application Number:
PCT/IB2004/050769
Publication Date:
December 02, 2004
Filing Date:
May 25, 2004
Export Citation:
Assignee:
PHILIPS INTELLECTUAL PROPERTY (DE)
KONINKL PHILIPS ELECTRONICS NV (NL)
HAACKE MICHAEL (DE)
DEPREZ FRANCIS MARTIN JOZEF (DE)
KONINKL PHILIPS ELECTRONICS NV (NL)
HAACKE MICHAEL (DE)
DEPREZ FRANCIS MARTIN JOZEF (DE)
International Classes:
H01J61/073; H01J61/86; H01K9/00; F21Y101/00; (IPC1-7): H01K9/00
Domestic Patent References:
| WO1999033091A1 | 1999-07-01 | |||
| WO2003075310A1 | 2003-09-12 |
Foreign References:
| US5041041A | 1991-08-20 | |||
| US6218025B1 | 2001-04-17 | |||
| US4210840A | 1980-07-01 | |||
| EP1063681A2 | 2000-12-27 |
Attorney, Agent or Firm:
VOLMER, Georg (Weisshausstr. 2, Aachen, DE)
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