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    • 2. 发明公开
    • OPTICAL FIBER PRODUCTION METHOD AND PRODUCTION DEVICE, AND OPTICAL FIBER
    • GLASFASERHERSTELLUNGSVERFAHREN UND -ORRICHTUNG SOWIE GLASFASER
    • EP2803643A1
    • 2014-11-19
    • EP13736334.7
    • 2013-01-09
    • Sumitomo Electric Industries, Ltd.
    • ENOMOTO, TadashiOKAZAKI, IwaoYAMAZAKI, TakashiHAYAKAWA, MasatoshiSHIOZAKI, ManabuUENOYAMA, NorihiroFURUSYOU, Masaru
    • C03B37/027G02B6/00
    • C03B37/029C03B37/0253C03B37/027C03B37/02727C03B2205/30C03B2205/40C03B2205/56C03B2205/63C03B2205/70C03B2205/92G02B6/10G02B2006/12166Y02P40/57
    • The present invention provides a method and an apparatus for producing an optical fiber in which the increase in transmission loss is reduced while the variation in the diameter of a glass fiber is suppressed using an inexpensive inert gas or the like and inexpensive auxiliary devices, and provides an optical fiber to be produced using the method and the apparatus. The apparatus is equipped with a susceptor (13) into which an optical fiber preform (11) is inserted and a heater (15) disposed outside the susceptor to heat the susceptor from the outside and produces an optical fiber by drawing a glass fiber (12) while the optical fiber preform is heated and melted and by drawing out the fiber through the outlet at the lower section of the susceptor to the outside. A gas containing 50% or more of argon or nitrogen is used as a gas to be supplied into the susceptor, and a protective pipe (17) with a length of Da (mm) is provided under the susceptor, the protective pipe having a heat insulating region (17a) enclosed with a heat insulator (18) with a length of Db (mm) at the upper section thereof and a non-heat insulating region (17b) not enclosed with any heat insulators at the lower section thereof, and settings are made so that the temperature of the glass fiber at the outlet of the protective pipe becomes 1700°C or less and so that the outer diameter of the glass fiber at the outlet of the protective pipe is within a range of the target outer diameter of the glass fiber + 6 µm or less.
    • 本发明提供了一种用于制造光纤的方法和装置,其中使用便宜的惰性气体等和便宜的辅助装置来抑制玻璃纤维的直径的变化,从而降低了传输损耗的增加,并提供了 使用该方法和装置制造的光纤。 该装置配备有一个基座(13),光纤预制件(11)插入该基座中,并且设置在基座外部的加热器(15),以从外部加热基座,并通过拉伸玻璃纤维(12 ),同时光纤预制件被加热和熔化,并且通过将基座的下部的出口向外拉出纤维。 使用含有50%以上的氩气或氮气的气体作为供给到基座的气体,并且在基座下方设置长度为Da(mm)的保护管(17),保护管具有热量 在其上部具有长度为Db(mm)的绝热体(18)封闭的绝缘区域(17a)和在其下部没有被任何绝热体封闭的非绝热区域(17b),以及设置 使得保护管出口处的玻璃纤维的温度变为1700℃以下,使保护管出口处的玻璃纤维的外径在目标外径的范围内 玻璃纤维+6μm以下。