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US 4,061,939 AGranted
Low noise sodium vapor lamp for sonic pulse operation
AssigneeGeneral Electric Company
InventorJack M. Strok, Jr.
Life of this patent
Estimating the term…
Abstract
Jacketed high pressure sodium vapor lamps of conventional construction operated on sonic frequency pulses with short duty cycles in order to raise the color temperature produce excessive acoustic noise. The noise level is reduced by using non-magnetostrictive material for the inleads extending from the base into the outer envelope and including the portions embedded in the press of the stem, and for the frame parts that support the arc tube within the outer envelope.
Claims6
A jacketed high pressure sodium vapor lamp for operation at low noise levels on sonic pulses of short duty cycle comprising:
- an elongated light-transmitting ceramic arc tube having conductive electrode-supporting closures sealed to opposite ends and containing an ionizable filling including sodium, said electrodes and closures comprising only non-magnetostrictive material,
- an evacuated outer vitreous envelope surrounding said arc tube, said envelope having a vitreous stem at one end including a press through which extend a pair of inleads, all portions of said inleads including an intermediate portion sealed through the press, an inner portion passing into the outer envelope, and an outer portion being of non-magnetostrictive metal,
- a metal wire frame within said envelope for supporting and making electrical connections to said arc tube, said frame comprising a long side rod extending from the inner portion of one inlead to the other end of said envelope, and a short rod extending from the inner portion of the other inlead, both said rods being of non-magnetostrictive metal,
- and attachments between said arc tube closures and said rods.
1 more element
Dependencies are inferred from the claim text.