Linear sodium lamp arc tube centering means

Details Linear sodium lamp arc tube centering means Linear sodium lamp arc tube centering means

1986-11-07

1988-04-12

Moore, David K.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313631, 313634, 313253, H01J 61073, H01J 6134

Patent

active

047376775

ABSTRACT:
A high pressure sodium vapor discharge lamp of the type having a discharge tube with a feed-through tube and an internal electrode at each end of the tube. An outer envelope encompasses the arc tube and there is an arc tube centering means disposed within the outer envelope and electrically coupled to the arc tube. The arc tube centering means is comprised of a geometric configuration which compensates for thermal expansion differences between the arc tube and the outer envelope during lamp sealing and, more importantly, lamp operation. The arc tube centering means includes a pair of offset lead wires, at least one of which has a twisted loop disposed along its length. The offset lead wires are preferably made of niobium.

REFERENCES:
patent: 3662203 (1972-05-01), Kuhl et al.
patent: 3882346 (1975-05-01), Mc Vey
patent: 3932781 (1976-01-01), Peeters et al.
patent: 4254355 (1981-03-01), Taylor
patent: 4401913 (1983-08-01), Koza et al.

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