| 摘要 |
PURPOSE:To manufacture a mercury vapor discharge lamp with excellent optical flux start characteristics by enclosing amalgam formation metals in a tube, sealing the tube opening end, exhausting gas from an exhaust tube, and preventing the oxidation of amalgam. CONSTITUTION:An outer tube bulb 2 has opening section 4 on one end and two or more U-shaped inner tubes 6 fused so as to pass an electrode 5 through an inner part on the other end. A tube 8 whose one end is opened and whose other end is covered with a Ni wire mesh is fused on the bottom 3 by glass frit on the electrodeless end of this inner tube 6 so that the end can be protruded in the inner tube 6. In addition, when low melting point glass frit is used, the tube is enclosed tightly and sealed through the heating process. A fluorescent lamp 1 is taken out from a heating furnace in this sealing process so that the tube 8 can be located upward and indium metal is enclosed from the opening end. Then, the exhaust process is reached by using the tube 8 as the exhaust tube. |
