Patent ID: 6713961
Filing Date: 2004-03-30
Classification: H01J

Abstract:
A high-intensity discharge lamp, comprising:a lighting-source bulb provided with a light-transmissive ceramic discharge enclosure containing an enclosure defining a discharge space and a pair of small-diameter cylinders communicating with the enclosure at both ends thereof and having an inside diameter smaller than the enclosure, a first and a second slender electrodes extending through the small-diameter cylinders of the light-transmissive ceramic discharge enclosure in leaving narrow gaps between the inside surfaces of the small-diameter cylinders and the electrodes and discharge agent filled in the light-transmissive ceramic discharge enclosure; a first metallic coil which is wound on the outside surface of the one end of the small-diameter cylinder wherein the first electrode is inserted through and which is coupled to have the same potential as the second electrode; a second metallic coil which is wound on the other small-diameter cylinder through which the second electrode extends, and which is coupled to the first electrode to have the same potential as the electrode; a jacket-bulb which accommodates the lighting-source bulb and the first and the second metallic coils hermetically; and a pair of outer lead terminals which are coupled to the first and second electrodes and hermetically led outside the jacket-bulb.