High pressure sodium lamp with sodium amalgam of controlled amou

Details High pressure sodium lamp with sodium amalgam of controlled amou High pressure sodium lamp with sodium amalgam of controlled amou

1988-11-30

1990-08-21

DeMeo, Palmer C.

Electric lamp and discharge devices

Having vapor generating material

313624, 313625, 313638, H01J 6130, H01J 6136, H01J 6128, H01J 6122

Patent

active

049509535

ABSTRACT:
A high pressure sodium lamp including a light permeable arc tube and an electrode extending into the arc tube via a central aperture provided in the arc tube. The electrode is supported in the aperture by means of a glass solder sealing composition. Sodium amalgam is seated in the arc tube and condensed at a corner thereof. To prevent sodium amalgam condensed at the corner of the arc tube from contacting the glass solder filled in the central aperture of the arc tube, sodium amalgam including sodium of 10-30 (wt %) is sealed in the arc tube at a prescribed volume V (mm.sup.3) which substantially satisfies the following relationship: ##EQU1## where D (mm) is the diameter of the arc tube, d (mm) is the diameter of the central aperture, Vo (mm.sup.3) is the volume of the sodium amalgam sealed in the arc tube when the shortest distance between the sodium amalgam condensed at the corner and the glass solder filled in the central aperture is given by ##EQU2## and WL (W) is the lamp power.

REFERENCES:
patent: 4156550 (1979-05-01), Furukubo et al.
patent: 4539511 (1985-09-01), Denbigh et al.
patent: 4560903 (1985-12-01), Sneijers et al.
IEEE Proc., Vol. 128, Pt. A, No. 6, Sep. 1981, J. A. J. M. van Vliet, Ir., and J. J. de Groot, Dr. Ir. "High-Pressure Sodium Discharge Lamps".

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