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

1982-07-19

1985-02-12

Moore, David K.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

313490, H01J 6302

Patent

active

044994001

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: 4017764 (1977-04-01), Anderson
patent: 4047071 (1977-09-01), Busch et al.
patent: 4105910 (1978-08-01), Evans
patent: 4157485 (1979-06-01), Wesselink et al.

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