H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 61/30 (2006.01) H01J 61/54 (2006.01)
Patent
CA 2267917
An arc tube for a discharge lamp comprises an hermetically sealed hollow body containing an arc generating and sustaining medium therein and having first and second ends. An electrode receiving capillary extends from each end and an electrode structure is positioned in each of the capillaries. Each of the electrode structures comprises a proximal, electrode end projecting into the interior of the hollow body, a distal end projecting exteriorly of the capillary, and an intermediate section therebetween, a first area of the intermediate section being sealed to the capillary in an hermetic manner and a second area of the intermediate section being exposed to the medium. A starting aid comprises an electrically conducting member surrounding the capillary extending from the first end at the second area of the intermediate section and is electrically connected to the distal end of the electrode structure positioned in the second end. The starting aid provides a capacitively coupled ionization mechanism for starting the lamp.
Fetherstonhaugh & Co.
Osram Sylvania Inc.
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