Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure
Patent
1992-08-07
1995-02-28
Yusko, Donald J.
Electric lamp and discharge devices
With gas or vapor
Envelope with particular structure
313637, 313638, 220 21R, H01J 6135, H01J 1716
Patent
active
053940571
ABSTRACT:
An arc tube of fused silica for a metal halide arc discharge lamp including a fill for the arc tube comprised of a sodium halide, at least one additional metal halide, and an inert starting gas, the arc tube including a tube of fused silica having an inner wall defining an arc chamber, the inner wall of the tube having provided thereon a metal silicate coating which is vitreous and light-transmissive, and which is comprised of a silicate of at least one metal selected from the group consisting essentially of scandium, yttrium, and a rare earth element, and preferably which is the same metal as that of the at least one additional metal halide. Protection of the fused silica arc tube with the metal silicate coating reduces loss of the metallic portion of the fill by diffusion or reaction and corresponding buildup of free halogen in the arc tube.
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Datta Ranajit K.
Kaliszewski Mary S.
Mathews Paul G.
Russell Timothy D.
Scott Curtis E.
Corcoran Edward M.
Corwin Stanley C.
General Electric Company
Patel N. D.
Yusko Donald J.
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