Dosing composition for high pressure sodium lamps

Electric lamp and discharge devices – Having vapor generating material – Mercury vapor material

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313639, 313642, H01J 6120

Patent

active

046911413

ABSTRACT:
The present invention relates to a dosing composition useful in high pressure sodium lamps. The invention relates specifically to new multicomponent alloy fills for HPS lamps and the design of such fills. The present invention provides an HPS lamp dosing composition that will supply the required amount of sodium and mercury for proper lamp operation, but which will have a lower vapor pressure during the sealing operation, such that mercury loss from the composition will be lower than that from the presently used sodium amalgam. In the present invention, either one of the compounds, Ti.sub.3 Hg or Zr.sub.3 Hg, is mixed with an intermetallic compound of sodium that has a melting point above about 600.degree. C., such that both the mercury and sodium metal are stabilized to avoid melting or vaporization at about 600.degree. C. The preferred sodium compound is Na.sub.3 Bi, which melts at 755.degree. C., although Na.sub.3 Sb and Na.sub.2 Te with higher melting points may be used. The dosing mixture for HPS lamps is preferably a mixture of Ti.sub.3 Hg and Na.sub.3 Bi.

REFERENCES:
patent: 3318649 (1963-10-01), Keller et al.
patent: 3384798 (1968-05-01), Schmidt
patent: 3657589 (1972-04-01), Porta et al.
patent: 3733194 (1973-05-01), Porta et al.
patent: 3926832 (1975-12-01), Barosi
patent: 4107565 (1978-08-01), Isojima et al.

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