| 摘要 |
<p>An arc tube of a metal vapor discharge lamp, free from change in color characteristics at the initial stage and from color variation and having good color characteristics as a high color rendering type with no degradation of luminous flux due to blackening of the arc tube. The arc tube comprises a ceramic discharge enclosure, thin tube protrusions disposed on both ends of the discharge enclosure, and an electrode system secured to hollow portions of the protrusions. The electrode system includes a tungsten electrode rod having an electrode coil at its end, a halogen-resistant pipe fitted to a portion excepting the electrode coil of the electrode core and its vicinity, and a current lead having a tubular metal conductor jointed to the halogen-resistant pipe and one end of the electrode rod and an external lead arranged therein.</p> |
