Use of amalgams in solenoidal electric field lamps

Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium

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445 31, 228220, H01J 1928, B23K 3100

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active

044108290

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: 4262231 (1981-04-01), Anderson et al.

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