Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Filament – electric heater – or resistance in shunt with the...
Patent
1982-07-30
1984-04-10
Laroche, Eugene R.
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Filament, electric heater, or resistance in shunt with the...
315 73, 315108, 315116, H05B 4116, H01J 6156
Patent
active
044423799
ABSTRACT:
An improved high pressure sodium vapor lamp is described having resistance heater means contained within a tubular light-transmitting ceramic envelope that further contains a reservoir of sodium-mercury amalgam in excess of the quantity vaporized during lamp operation in order to increase the quantity of amalgam being vaporized during lamp operation and thereby help maintain the desired lamp color temperature. In a preferred embodiment, said resistance heater means comprises a refractory metal coil wound around the tungsten shank of one thermionic electrode and electrically insulated therefrom with said thermionic electrode including a tubular metal inlead serving as the amalgam reservoir.
REFERENCES:
patent: 3851207 (1974-11-01), McVey
patent: 4182976 (1980-01-01), Larson
Frey Robert G.
McVey Charles I.
General Electric Company
Jacob Fred
LaRoche Eugene R.
McDevitt John F.
Schlamp Philip L.
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