| 摘要 |
PURPOSE:To reduce an amount of impurities inside a lamp after an evacuation process by decomposing carbonate by heating in a mounted state while sealing an electrode, from which an impurity gas is evacuated, in a glass tube for being translated to an evacuation process. CONSTITUTION:A globe 2 is set up on the electrode mount part such as the mounts 1, 1' or the like on a conveyer before sealing while the pipes 3, 3' or the like are passed thereinto for making N2 to flow in and the leading-in wires 4, 4' or the like are held between the electric contactors 5, 5' or the like at an index stop for conducting an electrode 6 to which carbonate is applied. Thereafter, the mounts are translated to a sealing process for being sealed in a glass tube 9 while making N2 to flow from a nozzle 8 having a closing plate. The mounts on the opposite side having no evacuation pipes are also sealed in the tube 9 by the same method. Accordingly, the electrodes, where N2 fills the inside of the tube 9 while carbonate is decomposed and oxidized, are sealed on both sides. Thereafter, the bulb inside is once evacuated with heating the glass tube wall while the tube is circularized in a state, where N2 of one atmospheric pressure is sealed, for again evacuating N2 and conducting a filament in order to evacuate the impurity gas and to activate the electrodes. |
