Invention Grant
- Patent Title: Thorium-free electrode with improved color stability
- Patent Title (中): 无电极的电极具有改善的颜色稳定性
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Application No.: US10557685Application Date: 2004-05-25
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Publication No.: US07808180B2Publication Date: 2010-10-05
- Inventor: Michael Haacke , Francis Martin Jozef Deprez
- Applicant: Michael Haacke , Francis Martin Jozef Deprez
- Applicant Address: NL Eindhoven
- Assignee: Koninklijke Philips Electronics N.V.
- Current Assignee: Koninklijke Philips Electronics N.V.
- Current Assignee Address: NL Eindhoven
- Priority: EP03101517 20030526; EP03103831 20031016
- International Application: PCT/IB2004/050769 WO 20040525
- International Announcement: WO2004/105082 WO 20041202
- Main IPC: H01H61/04
- IPC: H01H61/04

Abstract:
An electrode includes thorium as a minor component for a high-pressure discharge lamp, where the electrode rod is free of thorium/thorium oxide, or comprises thorium/thorium oxide, as a minor constituent. A covering member made of refractory metal, free of thorium/thorium oxide, is circumference coated on the electrode rod in the vicinity of the discharge side tip. The entire surface of the electrode rod is completely coated over the range where the covering member extends. The electrode rod tip of the electrode rod is not, or at least partly, coated with the covering member. The part of the electrode tip, which is not coated by the covering member, is free of thorium/thorium oxide.
Public/Granted literature
- US20070182332A1 Thorium-free electrode with improved color stability Public/Granted day:2007-08-09
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