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    Method for producing glass preform for optical fiber
    3.
    发明授权
    Method for producing glass preform for optical fiber 失效
    光纤玻璃预制棒的制造方法

    公开(公告)号：US5330548A

    公开(公告)日：1994-07-19

    申请号：US913965

    申请日：1992-07-17

    申请人： Toshio Danzuka ,  Masumi Ito ,  Ichiro Tsuchiya

    发明人： Toshio Danzuka ,  Masumi Ito ,  Ichiro Tsuchiya

    IPC分类号： C03B37/014 ,  C03B37/023

    CPC分类号： C03B37/0146 ,  C03B37/01446

    摘要： A transparent glass preform for an optical fiber is produced by heating a glass soot preform to remove gas from the soot preform at a temperature at which the soot preform is not vitrified under reduced pressure, and then heating the preform at a temperature at which the preform is vitrified under reduced pressure, whereby the transparent glass preform containing no or little bubbles and having a uniform outer diameter is produced.

    摘要翻译： 用于光纤的透明玻璃预制件通过加热玻璃烟炱预制件以在烟灰预制件在减压下未玻璃化的温度下从烟炱预制件中除去气体，然后在预成型件的温度下加热预成型件 在减压下进行玻璃化，由此产生不含或少量气泡且具有均匀外径的透明玻璃预制件。

    Process for consolidation of porous preform for optical fiber
    4.
    发明授权
    Process for consolidation of porous preform for optical fiber 失效
    用于光纤多孔预型件的固结工艺

    公开(公告)号：US5470369A

    公开(公告)日：1995-11-28

    申请号：US197534

    申请日：1994-02-16

    申请人： Ichiro Tsuchiya ,  Toshio Danzuka ,  Masumi Ito

    发明人： Ichiro Tsuchiya ,  Toshio Danzuka ,  Masumi Ito

    IPC分类号： C03B37/014 ,  G02B6/00 ,  C03B37/018

    CPC分类号： C03B37/01446 ,  C03B37/0146

    摘要： There is provided a process for the consolidation of a porous glass preform for an optical fiber by heating the preform under an increasing pattern of a heating temperature in a vacuum furnace comprising a muffle tube therein characterized in that the increasing pattern is divided into two steps consisting of a first step and a second step with regard to time, and the first step has a pattern in which the heating temperature is increased under a reduced pressure atmosphere and a gas comprising at least an inert gas is supplied to the vacuum furnace under the reduced pressure atmosphere and the second step has a pattern in which the heating temperature is increased under a reduced pressure atmosphere in which a gas comprising a smaller amount of an inert gas than that of the first step is supplied to the vacuum furnace or under a vacuum pressure atmosphere in which no gas is supplied to the vacuum furnace.

    摘要翻译： 提供了一种通过在包括马弗管的真空炉中以加热温度升高的模式加热预成型件来固化光纤的多孔玻璃预制件的方法，其特征在于，将增加的图案分为两个步骤： 关于时间的第一步骤和第二步骤，并且第一步骤具有在减压气氛下加热温度升高的模式，并且至少包含惰性气体的气体在减压下供给到真空炉中 第二步骤是在减压气氛中加热温度升高的模式，其中将包含比第一步骤少的惰性气体的气体供给至真空炉或真空压力 没有气体供应到真空炉的气氛。

    Method for elongating glass preform
    5.
    发明授权
    Method for elongating glass preform 失效
    拉伸玻璃预制件的方法

    公开(公告)号：US5755849A

    公开(公告)日：1998-05-26

    申请号：US756483

    申请日：1996-11-26

    申请人： Sumio Hoshino ,  Yuichi Ohga ,  Masumi Ito ,  Toshio Danzuka ,  Tatsuhiko Saito

    发明人： Sumio Hoshino ,  Yuichi Ohga ,  Masumi Ito ,  Toshio Danzuka ,  Tatsuhiko Saito

    IPC分类号： C03B23/047 ,  C03B37/012 ,  C03B37/014 ,  C03B37/07

    CPC分类号： C03B23/047 ,  C03B37/0124 ,  C03B37/01466

    摘要： The present invention relates to a method for precisely elongating a glass preform of an optical fiber body having a desired outer diameter. In this method, a predetermined part of the glass preform is elongated as tensile stress is applied to one end of the glass preform while a predetermined part of the glass preform is heated and softened successively from one end toward the other end of the glass preform. In this elongating operation, while the outer diameter of the softening portion of the glass preform is measured, the tensile stress is adjusted such that the outer diameter of the softening portion coincides with a preset value of the control outer diameter. In particular, this method is characterized in that the preset value of the control outer diameter is changed at least during a predetermined period until termination of elongation or during a predetermined period from the start of elongation.

    摘要翻译： 本发明涉及一种精确拉伸具有所需外径的光纤体的玻璃预制件的方法。 在这种方法中，玻璃预成型件的预定部分是细长的，因为拉伸应力被施加到玻璃预制件的一端，同时玻璃预制件的预定部分从玻璃预制件的一端向另一端依次加热软化。 在该拉伸操作中，在测量玻璃预制件的软化部分的外径的同时，调整拉伸应力使得软化部分的外径与控制外径的预设值一致。 特别地，该方法的特征在于，控制外径的预设值至少在延伸终止的预定时段期间或从伸长开始的预定时段期间改变。

    Method of manufacturing single-mode optical fiber
    6.
    发明授权
    Method of manufacturing single-mode optical fiber 失效
    单模光纤制造方法

    公开(公告)号：US5676725A

    公开(公告)日：1997-10-14

    申请号：US623736

    申请日：1996-03-29

    申请人： Masumi Ito ,  Sumio Hoshino ,  Toshio Danzuka

    发明人： Masumi Ito ,  Sumio Hoshino ,  Toshio Danzuka

    IPC分类号： C03B37/014 ,  C03B37/018 ,  C03B37/07

    CPC分类号： C03B37/0148 ,  C03B37/01413 ,  C03B37/0142 ,  C03B37/01466 ,  C03B2201/31 ,  C03B2203/24 ,  C03B2207/50 ,  C03B2207/54 ,  C03B2207/70

    摘要： A method of manufacturing an optical fiber in which the deviation of a cutoff wavelength from a design value can be minimized. It is found that, upon diameter reduction of a porous core glass body by heat treatment, when the diameter reduction ratio is set to a value larger than 0.90, a "spike" in the refractive index distribution curve of a core can be prevented, and the deviation of the cutoff wavelength from the design value can be minimized. Therefore, there is provided a method comprising the first step of depositing fine SiO.sub.2 particles and fine GeO.sub.2 particles, which are produced by a core formation burner, to grow a porous core glass body from a distal end of a rotating starting rod in an axial direction, the second step of performing diameter reduction by heating the grown porous core glass body by heating means while growing the porous core glass body, and the third step of depositing fine SiO.sub.2 particles produced by a cladding formation burner to form a porous cladding glass layer on an outer surface of the diameter-reduced porous core glass body while performing growing and diameter reduction of the porous core glass body, wherein an outer diameter of the porous core glass body after the third step of depositing is larger than 0.90 times an outer diameter before diameter reduction.

    摘要翻译： 制造其中截止波长与设计值的偏差可以最小化的光纤的方法。 发现通过热处理使多孔芯玻璃体直径减小时，当直径减小率设定为大于0.90的值时，可以防止芯的折射率分布曲线中的“尖峰”，并且 截止波长与设计值的偏差可以最小化。 因此，提供了一种方法，该方法包括沉积由芯形燃烧器产生的细SiO 2颗粒和细小的GeO 2颗粒的第一步骤，以从旋转起始杆的远端沿轴向方向生长多孔芯体玻璃体 第二步，通过在生长多孔芯玻璃体的同时通过加热装置加热生长的多孔芯玻璃体进行直径减小，以及第三步骤，沉积由包层形成燃烧器产生的细SiO 2颗粒，以形成多孔包层玻璃层 在减小多孔芯玻璃体的外表面，同时进行多孔芯玻璃体的生长和直径减小，其中在第三沉积步骤之后的多孔芯玻璃体的外径大于之前的外径的0.90倍 直径减小。

    Apparatus for vitrifying soot preform for optical fiber
    7.
    发明授权
    Apparatus for vitrifying soot preform for optical fiber 失效
    玻璃化用于光纤的烟灰预制件的装置

    公开(公告)号：US5513983A

    公开(公告)日：1996-05-07

    申请号：US255875

    申请日：1994-06-08

    申请人： Masumi Ito ,  Ichiro Tuchiya ,  Toshio Danzuka ,  Yuichi Ohga ,  Sumio Hoshino

    发明人： Masumi Ito ,  Ichiro Tuchiya ,  Toshio Danzuka ,  Yuichi Ohga ,  Sumio Hoshino

    IPC分类号： C03B8/00 ,  C03B8/04 ,  C03B20/00 ,  C03B37/014 ,  F27B5/04

    CPC分类号： C03B37/0146 ,  Y02P40/57

    摘要： An apparatus for vitrifying a soot preform from which an optical fiber is produced by drawing, is composed of a main vacuum chamber 20 in which a muffle tube 70 for vitrifying the soot preform PF is located, and an auxiliary vacuum chamber 30 mounted on the main vacuum chamber 20 and communicated therewith through a passage, and a gate valve 60 for opening and closing the passage. The muffle tube 70 has a inner surface covered with silicon carbide layer 70a.

    摘要翻译： 用于玻璃化烟灰预制件的装置由拉丝制成光纤的装置由主真空室20组成，主真空室20中安装用于玻璃化烟灰预成型体PF的马弗管70和安装在主体上的辅助真空室30 真空室20并通过通道与其连通，以及用于打开和关闭通道的闸阀60。 马弗管70具有覆盖有碳化硅层70a的内表面。

    Process for production of glass preform for optical fiber including consolidating in a furnace with a temperature gradient
    9.
    发明授权
    Process for production of glass preform for optical fiber including consolidating in a furnace with a temperature gradient 失效
    生产用于光纤的玻璃预制棒的方法，包括在具有温度梯度的炉中固结

    公开(公告)号：US5693115A

    公开(公告)日：1997-12-02

    申请号：US204100

    申请日：1994-03-02

    申请人： Masumi Ito ,  Toshio Danzuka ,  Yuichi Ohga ,  Sumio Hoshino ,  Ichiro Tsuchiya

    发明人： Masumi Ito ,  Toshio Danzuka ,  Yuichi Ohga ,  Sumio Hoshino ,  Ichiro Tsuchiya

    IPC分类号： C03B8/04 ,  C03B20/00 ,  C03B37/014 ,  G02B6/00 ,  C03B37/012

    CPC分类号： C03B37/01446

    摘要： In order to provide an improved process for the production of a glass preform for an optical fiber which includes substantially no bubble formation therein and also has a substantially uniform shape, the present invention provides a process for the production of a glass preform which is at least partially formed from silica. In particular, a body is formed on a rod by depositing fine glass particles thereon, preferably by the vapor phase reactions, and heating the body to vitrify under a reduced atmosphere or a vacuumed atmosphere so that the glass preform is produced. According to this process, the heating includes a first heating step of degassing the body at a first heating temperature, a second heating step of shrinking the body at a second heating temperature which is higher than the first heating temperature and which is lower than a third heating temperature, and a third heating step of vitrifying the shrunken body at the third temperature which corresponds to a vitrification temperature of the fine glass particles so as to produce the glass preform.

    摘要翻译： 为了提供用于生产用于光纤的玻璃预制棒的改进方法，其包括基本上不形成气泡并且还具有基本上均匀的形状，本发明提供了一种用于生产玻璃预制件的方法，所述玻璃预制件至少是 部分由二氧化硅形成。 特别地，通过优选通过气相反应在其上沉积微细玻璃颗粒而在棒上形成主体，并且在还原气氛或真空气氛下将体加热至玻璃化，从而制备玻璃预制件。 根据该方法，加热包括在第一加热温度下使本体脱气的第一加热步骤，在比第一加热温度高于第三加热温度的第二加热温度下使本体收缩的第二加热步骤， 加热温度，第三加热步骤，在与玻璃微细玻璃微粒的玻璃化温度对应的第三温度下使收缩体玻璃化，制成玻璃预制件。