High pressure arc discharge lamp having concave shaped outer...

Details High pressure arc discharge lamp having concave shaped outer... High pressure arc discharge lamp having concave shaped outer...

H - Electricity

01

J

313/135

H01J 61/34 (2006.01) H01J 5/12 (2006.01) H01J 61/30 (2006.01)

Patent

CA 1164037

- 5 - HIGH PRESSURE ARC DISCHARGE LAMP HAVING CONCAVE SHAPED OUTER JACKET In a high pressure arc discharge lamp of the type comprising an elongated arc tube having electrodes at its ends and disposed substantially axially within a glass outer jacket, the improvement which comprises the portion of the outer jacket surrounding the arc tube having a concave shape longer than the internal length of the arc tube, the pressure in the arc tube during normal operation being greater than one atmosphere. This shape is such that it contains arc tube fragments in the event of violent failure of the arc tube.

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