Electrodeless fluorescent lamp with optimized amalgam positionin

Details Electrodeless fluorescent lamp with optimized amalgam positionin Electrodeless fluorescent lamp with optimized amalgam positionin

1993-10-04

1995-07-18

Pascal, Robert J.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Induction-type discharge device load

315 57, 315267, 313493, 313490, H05B 4116

Patent

active

054344824

ABSTRACT:
An amalgam is accurately placed and retained in an optimal location near the cold spot of an electrodeless SEF lamp for operation at a mercury vapor pressure in the optimum range from approximately four to seven millitorr. The amalgam is positioned at the tip of an extended exhaust tube near the apex of the lamp envelope by forming an indentation in the exhaust tube and, in some embodiments, a dose locating member in combination therewith. An evacuation hole is formed below the indentation for evacuation of the lamp envelope, or bulb, during lamp fabrication. In an alternative embodiment, the extension of the exhaust tube is situated perpendicular to the main portion of the tube to allow for lateral adjustment of the position of the amalgam, thereby allowing for even further control of the amalgam operating temperature.

REFERENCES:
patent: 4010400 (1977-03-01), Hollister
patent: 4017764 (1977-04-01), Anderson
patent: 4262231 (1981-04-01), Anderson et al.
patent: 4437041 (1984-03-01), Roberts
patent: 4622495 (1986-11-01), Smeelen
patent: 4728867 (1988-03-01), Postma et al.

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