| 摘要 |
PURPOSE:To enhance the efficiency of a metal vapor electric-discharge lamp by preparing an emission tube from a polycrystalline or monocrystalline ceramic member, and sealing both ends of the emission tube with sealing ceramic members in each of which a metallic thin-film electric conductor connected to an electrode is sealed. CONSTITUTION:An emission tube 1 is prepared from a material such as alumina ceramic. Sealing members 4 used for airtightly sealing both ends of the tube 1 also are made of a material such as alumina ceramic. A metallic thin-film electric conductor 5, which is made of tungsten or the like, connected to an electrode 3, and supplies current to the electrode 3 from outside the emission tube 1, is airtightly sealed in each sealing member 4 by sintering work. The internal space of the tube 1 may be charged with a metal halide as well as with a metal such as Na or Hg. It also is charged with Xe gas or the like. As a result, the luminous efficiency of the lamp can be enhanced by reducing heat leaving from the ends of the tube 1 outside the tube 1. |
