Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
1978-10-25
1981-04-14
Segal, Robert
Electric lamp and discharge devices
With luminescent solid or liquid material
With gaseous discharge medium
313180, H01J 6302, H01J 1726
Patent
active
042622310
ABSTRACT:
A lead-tin-bismuth alloy is disposed within a solenoidal electric field lamp to control the mercury vapor pressure. In accordance with one embodiment of the present invention, the alloy is placed within the tip-off region of the lamp envelope. The alloy is fixed within the tip-off region by a means of wetting the alloy to a metal wire structure such as a helix or a cylindrical screen. Alternatively, the alloy may be placed on an interior surface of the envelope by first wetting the glass with a layer of indium. Additionally, methods for wetting the lead-tin-bismuth alloy to the metal wire include firing the alloy in contact with the wire in a hydrogen atmosphere at a sufficiently high temperature to wet the alloy to the wire. The present invention permits the control of mercury vapor pressure in solenoidal electric field discharge lamps.
REFERENCES:
patent: 3860852 (1975-01-01), Latassa et al.
patent: 4017764 (1977-04-01), Anderson
patent: 4035682 (1977-07-01), Bubar
patent: 4105910 (1978-08-01), Evans
Bloem et al., "Some New Mercury Alloys for use in Fluorescent Lamps," IES Transaction, vol. 6, #3, Apr. 1977, pp. 141-147.
Anderson John M.
Johnson Peter D.
Davis James C.
General Electric Company
Gerasimow Alexander M.
Segal Robert
Snyder Marvin
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