Electric lamp and discharge devices – With gas or vapor – Electrode composition
Patent
1998-12-11
2000-04-04
Patel, Nimeshkumar D.
Electric lamp and discharge devices
With gas or vapor
Electrode composition
313570, 313346R, H01J 1704
Patent
active
060465441
ABSTRACT:
The high-pressure metal halide discharge lamp comprises a quartz-glass lamp vessel (1) with an ionizable filling and two electrodes (2) which are connected to current conductors (3). The electrodes are provided with an emitter (6) which contains tungsten as a main component and at least three oxides, a first oxide which is chosen from hafnium oxide and zirconium oxide, a second oxide being lanthanum oxide, and a third oxide which is chosen from yttrium oxide.
REFERENCES:
patent: 5530317 (1996-06-01), Willemsen et al.
Daemen Catharina J. M.
Smolders Ann M. M.
Vandijck Francis J. C.
Faller F. Brice
Hopper Todd Reed
Patel Nimeshkumar D.
U.S. Philips Corporation
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