| 摘要 |
PURPOSE:To obtain hermetically sealing parts of a luminous tube by keeping a luminous tube bulb airtight by molten glass solder and next additionally putting a starting inert gas into the bulb and enlarging its pressure and sealing off opening parts of the bulb by the use of a closing matter. CONSTITUTION:An opening part 1a on one end of a luminous tube bulb 1 made of transmitting ceramics is first sealed off through glass solder 4 by the use of a ceramic closing matter 3A which supports an electrode 2. Sodium amalgam 5 is projected on a surface of the closing matter 3A from an opening part 1b on the other end 1b of the bulb 1. The bulb 1 with several members disposed on an opening part 1b is housed into a manufacturing device. After an enclosed container 9 is exhausted, the same gas as a starting inert gas (e.g., Xe) is introduced into the bulb 1. Next, a heater 10 is operated by a high-frequency heating device while the Xe gas is introduced into the bulb, so that the glass solder 4A is molten to seal off a via hole 6 of a closing matter 3B and a gap part formed between the closing matter 3B and the opening part 1b. At that time, a pressure of the gas in the container 9 is enlarged, and the container is heated, and thereafter it is cooled.
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