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    • 24. 发明授权
    • Method and furnace for drawing optical fibers
    • 拉丝光纤的方法和炉
    • US5637130A
    • 1997-06-10
    • US403765
    • 1995-07-13
    • Katsuya NagayamaKohei KobayashiHiroaki OhtaIchiro Tsuchiya
    • Katsuya NagayamaKohei KobayashiHiroaki OhtaIchiro Tsuchiya
    • C03B37/027C03B37/029
    • C03B37/029C03B2205/63C03B2205/90C03B2205/92
    • A furnace and method for drawing an optical fiber is provided. The furnace included a furnace core chamber in which a preform is inserted into the chamber through the upper end thereof and a drawn optical fiber is pulled out of the chamber through an opening positioned at the lower end thereof. The furnace also includes a gas-supply means for introducing an inert gas into the furnace core chamber to thus establish an inert gas atmosphere within the chamber, and a heater for heating the preform so that the lower part of the preform is molten and drawn into the optical fiber, which is positioned around the outer periphery of the furnace core chamber. The furnace further includes an inner furnace core tube, which is positioned within the furnace core chamber and which has a cylindrical part whose lower part is communicated to the opening of the furnace core chamber and a funnel-like part which is positioned on the upper end of the cylindrical part. The funnel-like part has a diameter gradually and upwardly increased so as to surround the lower portion of the molten portion of the preform.
    • PCT No.PCT / JP94 / 01132 Sec。 371日期1995年7月13日 102(e)1995年7月13日PCT PCT 1994年7月12日PCT公布。 公开号WO95 / 02560 日期:1995年1月26日提供了一种用于拉制光纤的炉和方法。 炉子包括炉芯室,其中预制件通过其上端插入室中,并且拉出的光纤通过位于其下端的开口从室中拉出。 该炉还包括用于将惰性气体引入炉芯室以便在室内建立惰性气体气体的气体供应装置,以及用于加热预制件的加热器,使得预成型件的下部熔化并拉入 该光纤位于炉芯室的外周周围。 该炉还包括内炉芯管,其位于炉芯室内,并具有圆筒部,其下部与炉芯室的开口连通,漏斗状部位于上端 的圆柱形部分。 漏斗状部分的直径逐渐向上增加,以便包围预成型件的熔融部分的下部。