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
1984-07-10
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 46, 315 73, 315108, 315116, H05B 4116
Patent
active
044595131
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 and which are supplied by electric current other than the lamp current responsive to a rise in the lamp operating voltage to reduce the quantity of amalgam being vaporized during lamp operation to help maintain said lamp operation at a relatively constant voltage. In a preferred embodiment, said resistance heater means comprises a refractory metal coil wound around the tungsten shank at one thermionic electrode and electrically insulated therefrom, with said thermionic electrode including a tubular metal inlead serving as the amalgam reservoir, and with the electric current being supplied at a lower value to said refractory metal coil than being supplied to said thermionic electrode.
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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