Use of amalgams in solenoidal electric field lamps

Details Use of amalgams in solenoidal electric field lamps Use of amalgams in solenoidal electric field lamps

1984-09-04

1985-07-09

Silverberg, Sam

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 66, 4273835, H01J 6128

Patent

active

045282099

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 or other metallic wetting agent. 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: 3392298 (1968-07-01), Menlley
patent: 3629641 (1971-12-01), Hofman
patent: 4093889 (1978-06-01), Bloem
patent: 4145634 (1979-03-01), Evans
patent: 4157485 (1979-06-01), Wesselink

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