PURPOSE: To make the electric discharge of a high pressure electric-discharge lamp to be easily initiated by connecting electrically a starting auxiliary body to a main electrode so that they have the same electric potential, adjusting appropriately the shortest distance between the outer wall of the emission tube and the metallic body of the said auxiliary body, and installing the said auxiliary body above the central axis of the emission tube.
CONSTITUTION: In a lamp which is lighted in any position but vertically, a starting auxiliary body 15 prepared by coating a metallic body 16 with an insulating body 17 is electrically connected to a main electrode 2 so that the body 15 has the same electric potential as the electrode 2. In addition, the shortest distance between the outer wall of an emission tube 1 and the metallic body 16 of the body 15 is restricted to below 7mm, and the body 15 is located above the central axis of the tube 1. When voltage is applied to the lamp through a ballast, pulse voltage sent from the ballast is applied across the main electrodes 2 and 3 and across the electrode 3 and the body 15 having the same electric potential as the electrode 2, and electric discharge is initiated easily.
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WATANABE KEIJI
DOBASHI MASAHIRO
SAITOU MASATO
