Electric lamp and discharge devices – With gas or vapor – Having particular electrode structure
Patent
1995-12-29
1999-11-09
Patel, Nimeshkumar
Electric lamp and discharge devices
With gas or vapor
Having particular electrode structure
313491, 313632, 313633, 313346R, H01J 6104
Patent
active
059820977
ABSTRACT:
Novel emitter materials, electrode assemblies amd lamps comprisinfg the same are provided in which, in accordance with the invention, novel electrodes are provided having a lamp electrode structure, preferably including a hollow ferrule for sealing in a lamp to permit evacuation; an emitter material of the invention on at least one surface thereof, preferably on a protrusion attached to the hollow ferrule; a thermal isolator, preferably in the form of a low thermal conductivity wire or an incised or cut-out portion of the hollow ferrule body, for thermally isolating the protrusion from the ferrule to maintain a sufficiently high temperature for thermionic emission, and further comprising an emitter material requiring no in-lamp processing. The emitter materials are a mixed oxide of Ba, Sr and mixtures thereof with one or more of the metals from the series comprising Ta, Ti, Zr, Sc, Y, and La, are preferably selected from the group consisting of Ba.sub.4 Ta.sub.2 O.sub.9, Ba.sub.5 Ta.sub.4 O.sub.15, BaY.sub.2 O.sub.4, BaCeO.sub.3, Ba.sub.x Sr.sub.1-x Y.sub.2 O.sub.4, Ba.sub.2 TiO.sub.4, BaZrO.sub.3, Ba.sub.x Sr.sub.1-x TiO.sub.3, and Ba.sub.x Sr.sub.1-x ZrO.sub.3, wherein x ranges from a value of 0 to 1, and are most preferably one or more mixed oxides selected from the group consisting of Ba.sub.4 Ta.sub.2 O.sub.9, BaY.sub.2 O.sub.4, BaCeO.sub.3, Ba.sub.0.5 Sr.sub.0.5 Y.sub.2 O.sub.4, Ba.sub.0.75 Sr.sub.0.25 Y.sub.2 O.sub.4, Ba.sub.2 TiO.sub.4, BaZrO.sub.3, Ba.sub.0.5 Sr.sub.0.5 TiO.sub.3, and Ba.sub.0.5 Sr.sub.0.5 ZrO.sub.3.
REFERENCES:
patent: 2686274 (1954-08-01), Rooksby
patent: 2806970 (1957-09-01), Meister et al.
patent: 2911376 (1959-11-01), Rudolph
patent: 3563797 (1971-02-01), Young et al.
patent: 3953376 (1976-04-01), Kern
patent: 3969279 (1976-07-01), Kern
patent: 4031426 (1977-06-01), Kern
patent: 4409517 (1983-10-01), Van Der Sande et al.
patent: 4797593 (1989-01-01), Saito et al.
patent: 5103133 (1992-04-01), Misomo
patent: 5111108 (1992-05-01), Goodman et al.
patent: 5258687 (1993-11-01), Duggan et al.
patent: 5387837 (1995-02-01), Roelevink et al.
Langevoort Jeroen
McGee Susan
McGee Thomas F.
Mehrotra Vivek
Young Edward
Bartlett Ernestine C.
Patel Nimeshkumar
Philips Electronics North America Corporation
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