High intensity lamp containing arc extinguishing base

Claim 2

A jacketed high intensity arc lamp comprising: a vitreous outer envelope having a neck and a pair of inleads sealed therein at the neck end through a press; an inner arc tube containing a discharge medium and having electrodes sealed into its ends and requiring a starting voltage high enough to start a discharge between spaced conductors in air; means supporting said arc tube within said outer envelope and including conductors connecting said electrodes to said inleads; a base attached to the neck of said outer envelope and comprising a metal shell, and end insulator, and an end contact centrally mounted thereon; one of said leads extending through said shell and being connected to said end contact and the other of said inleads being connected to said shell; and a sleeve within said base, said sleeve being of refractory insulating material which retains its shape and does not become conductive at high temperatures up to 1,000*C, said one inlead being passed through said sleeve which serves to assure a minimum breakdown voltage therefrom to said shell and facilitates arc extinguishment by drawing the arc up into the sleeve as said one inlead shortens until the arc is lengthened and constricted into extinction.

Claim 3

A laMp as in claim 1 including another sleeve of said refractory insulating material within said base, said other inlead being passed therethrough.

Claim 4

A lamp as in claim 1 wherein said sleeve is made of quartz-like material.

Claim 5

A lamp as in claim 1 including an end insulator made of ceramic material capable of serving as a firewall.

Claim 6

A jacketed high intensity arc lamp comprising: an evacuated vitreous outer envelope having a neck end closed by a re-entrant stem terminating in a press having a pair of inleads sealed therethrough side by side and extending through said stem; an inner elongated arc tube containing metal vapor and having electrodes sealed into its ends; said arc tube requiring a starting voltage high enough to start a discharge between spaced conductors in air; means supporting said arc tube within said outer envelope and including conductors connecting said electrodes to said inleads; a base attached to the neck end of said outer envelope and comprising a metal shell, and end insulator, and an end contact centrally mounted thereon; one of said inleads extending through said shell and being connected to said end contact and the other of said inleads being connected to said shell; and a sleeve within said base, said sleeve being of refractory insulating material which retains its shape and does not become conductive at high temperatures up to 1,000*C, said one inlead being passed through said sleeve to assure a minimum breakdown voltage therefrom to said shell and facilitate arc extinguishment by drawing the arc up into the sleeve as said one inlead shortens until the arc is lengthened and constricted into extinction.

Claim 7

A jacketed high intensity arc lamp comprising: an evacuated vitreous outer envelope having a neck end closed by a re-entrant stem terminating in a press having a pair of inleads sealed therethrough side by side and extending through said stem; an inner elongated arc tube containing metal vapor and having electrodes sealed into its ends; said arc tube requiring a starting voltage high enough to start a discharge between spaced conductors in air; means supporting said arc tube within said outer envelope and including conductors connecting said electrodes to said inleads; a base attached to the neck end of said outer envelope and comprising a metal shell, and end insulator, and an end contact centrally mounted thereon; one of said inleads extending through said shell and being connected to said end contact and the other of said inleads being connected to said shell; and a sleeve within said base, said sleeve being of refractory insulating material which retains its shape and does not become conductive at high temperatures up to 1,000*C, said one inlead being passed through said sleeve to assure a minimum breakdown voltage therefrom to said shell and facilitate arc extinguishment by drawing the arc up into the sleeve as said one inlead shortens until the arc is lengthened and constricted into extinction.

Claim 8

A lamp as in claim 5 wherein said sleeve extends from the end insulator of the base through the stem substantially all the way to the press.

Claim 9

A lamp as in claim 5 wherein said sleeve extends from the end insulator of the base through the stem substantially all the way to the press and including within said base another sleeve of said refractory insulating material through which said other inlead is passed.

Claim 10

A lamp as in claim 5 including an end insulator made of ceramic material capable of serving as a firewall.

Claim 11

A lamp as in claim 5 wherein said sleeve extends from the end insulator of the base into the stem opening only, and including means for restraining said sleeve in such position, and including within said base another sleeve of said refractory insulating material through which said other inlead is passed and extending all the way into the stem.

Claim 12

A lamp as in claim 9 wherein said sleeve is restrained in such position by a kink in said one lead wire passing through it.