High-pressure sodium lamp

Details High-pressure sodium lamp High-pressure sodium lamp

1980-11-19

1983-08-02

Smith, Alfred E.

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

313333, 313616, H01J 1704, H01J 6106

Patent

active

043968562

ABSTRACT:
Each of the electrodes at the ends of an arc tube filled with a buffer gas, metal and sodium comprises an electrode core, an electrode coil wound around the core, an electron-emitting means disposed in the annular space between the electrode core and electrode coil and a shielding means disposed in said annular space in such a way that the electron-emitting means is shielded from exposure to the discharge space in the arc tube. The ratio h/d is determined such that 0.8.ltoreq.h/d.ltoreq.5.4, where h is the length in mm of the portion of the electrode core extended beyond the inner end of the shielding means or the innermost coil of the electrode coil; and d is the diameter in mm of the electrode core.
The arc spots can be held to remain on the end faces of the electrode cores during lamp operation so that variations in electrical and optical characteristics can be almost eliminated.

REFERENCES:
patent: 3170081 (1965-02-01), Rokosz
patent: 3670195 (1972-06-01), Kamegaya et al.
patent: 4052634 (1977-10-01), Kok
patent: 4321503 (1982-03-01), Bhalla

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