High pressure sodium vapor lamp of unsaturated vapor pressure ty

Details High pressure sodium vapor lamp of unsaturated vapor pressure ty High pressure sodium vapor lamp of unsaturated vapor pressure ty

1976-04-21

1978-02-21

Demeo, Palmer C.

Electric lamp and discharge devices

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

For plural electrodes of discharge device

313318, H01J 6120, H01J 6122, H01J 6130

Patent

active

040755304

ABSTRACT:
In a high pressure sodium vapor lamp, sufficiently small quantities of sodium and mercury are inserted therein so that all of the added sodium and mercury will be vaporized when the lamp is operated. The quantities are so selected that a completed lamp exhibits high efficiency, remarkable color rendition and durability. Also, the lamp can produce a suitable arc voltage by means of a less expensive ballast.
The small quantity of sodium added is accurately controlled by decomposing sodium azide NaN3. The small quantity of mercury is accurately controlled by decomposing Ti-Hg alloy or Al-Zr-Ti-Hg alloy. In order to assure the perfect vaporization of the sodium and mercury filling the lamp, the exterior portions of the ends of the arc tube have wound thereon heat insulatng sleeves composed of a refractory insulating packing material. Metal plates are tightly wound around the packing materials to hold the sleeves on the tube without any securing means.

REFERENCES:
patent: 3315116 (1967-04-01), Beese
patent: 3453477 (1969-07-01), Hanneman et al.

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