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    • 9. 发明专利
    • HEATER FOR SEALING GLASS TUBE
    • JPS6364933A
    • 1988-03-23
    • JP21040186
    • 1986-09-06
    • FUJITSU GENERAL LTD
    • FUKUMA HIROSHIKURAI TERUO
    • H05B3/46C03B23/043C03B23/047C03B23/11C03B23/207H01J9/40
    • PURPOSE:To seal glass tubes readily and excellently, by heating a glass tube by a first heater having an insertion hole with a relatively larger diameter than that of the glass tube and cutting the glass tube by a second heater having an insertion hole with a somewhat large diameter. CONSTITUTION:A first heater 1 consists of a holder 2 made of ceramic and equipped with a glass tube insertion hole 3 having about 50-60% larger diameter than the outer diameter of a glass tube 16 to be sealed and of a coil-shaped heater 4 winding the holder 2. A second heater 5 equipped with an insertion hole 7 having about 5% larger diameter than that of the glass tube 16 is formed, both the heaters 1 and 5 are inserted through a spacer 11 into a casing 9 and the casing is closed with a cover 13. In the constitution, the glass tube 16 to be sealed is inserted through insertion holes 14, 3, 12, 7 and 10 into the casing. First electricity is sent to the first heater 1, the glass tube 16 is softened to produce a neck and electricity is changed to the second heater 5 to heat and cut the neck part. Then electricity is resent to the first heater 1 to finish the sealed part.