High pressure sodium vapor lamp having low starting voltage
First Claim
1. A HIGH PRESSURE SODIUM ARC DISCHARGE LAMP COMPRISING AN ALUMINA ARC TUBE DISPOSED WITHIN AN OUTER JACKET, THE ARC TUBE HAVING AN ELECTRODE AT EACH END AND CONTAINING A FILL INCLUDING SODIUM, AN MERCURY AND A PENNING GAS MIXTURE, A WIRE RING STARTING AID ENCIRCLING THE ARC TUBE, MORE PROXIMATE ONE ELECTRODE THAN THE OTHER, AND ELECTRICALLY CONNECTED TO SAID OTHER ELECTRODE THROUGH A TEMPERATURE ACTUATED SWITCH WHICH IS NORMALLY CLOSED AT ROOM TEMPERATURE AND WHICH IS OPEN DURING NORMAL LAMP OPERATION, THEREBY ELECTRICALLY DISCONNECTING THE WIRE RING STARTING AID.
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Accused Products
Abstract
The alumina arc tube of a high pressure sodium arc discharge lamp contains a Penning mixture gaseous filling and also has an encircling wire ring starting aid, in order to reduce lamp starting voltage. A temperature actuated circuit breaking device is in series with the starting aid in order to electrically remove it from the circuit after the lamp starts.
12 Citations
5 Claims
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1. A HIGH PRESSURE SODIUM ARC DISCHARGE LAMP COMPRISING AN ALUMINA ARC TUBE DISPOSED WITHIN AN OUTER JACKET, THE ARC TUBE HAVING AN ELECTRODE AT EACH END AND CONTAINING A FILL INCLUDING SODIUM, AN MERCURY AND A PENNING GAS MIXTURE, A WIRE RING STARTING AID ENCIRCLING THE ARC TUBE, MORE PROXIMATE ONE ELECTRODE THAN THE OTHER, AND ELECTRICALLY CONNECTED TO SAID OTHER ELECTRODE THROUGH A TEMPERATURE ACTUATED SWITCH WHICH IS NORMALLY CLOSED AT ROOM TEMPERATURE AND WHICH IS OPEN DURING NORMAL LAMP OPERATION, THEREBY ELECTRICALLY DISCONNECTING THE WIRE RING STARTING AID.
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2. The lamp of claim 1 wherein the gas mixture comprises neon and argon.
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3. The lamp of claim 2 wherein the gas mixture comprises at least 99% neon.
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4. The lamp of claim 1 wherein said arc tube has an arc length of 69 mm, said Penning gas mixture is 99% neon and 1% argon and said wire ring starting aid is 24.1 mm from said more proximate one electrode.
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5. The lamp of claim 1 wherein said arc tube has an arc length of 69 mm, said Penning gas mixture is 99.7% neon and 0.3% argon and said wire ring starting aid is 16.2 mm from said more proximate one electrode.
Specification
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Current AssigneeDonald A. Richardson
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Original AssigneeDonald A. Richardson
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InventorsRichardson, Donald A.
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Primary Examiner(s)Rolinec, R. V.
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Assistant Examiner(s)Hostetter, Darwin R.
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Application NumberUS05/473,613Time in Patent Office448 DaysField of Search313/198,201US Class Current313/594CPC Class CodesH01J 61/544 and an auxiliary electrode ...
