公开(公告)号：JPS5659637A

公开(公告)日：1981-05-23

申请号：JP13478879

申请日：1979-10-18

Applicant: FUJITSU LTD

Inventor： NISHIJIMA YOSHINDO ,  NAKAMURA OSAMU ,  KAWABATA YOSHIO ,  TATSUTA TAKASHI

IPC: C03B19/14 ,  C03B37/023 ,  G02B6/00

Abstract: PURPOSE:To inexpensively obtain a crucible capable of manufacturing a low-loss glass fiber contg. little impurities for optical transmission by using a natural quartz pipe with a synthetic quartz coat stuck to the inner wall. CONSTITUTION:Quartz guide tube 22 with one end tapered is welded to one end of natural quartz pipe 21. Oxygen gas is introduced from oxygen gas feed pipe 23 into evaporator 25 filled with an Si-contg. glass forming compound such as silicon tetrachloride, and the gas carrying the compound is introduced into pipe 21 through gas introduction pipe 26. On the other hand, by uniformly heating the outer wall of pipe 21 at about 1,800-2,000 deg.C with oxyhydrogen burner 27, the glass forming compound is oxidized to form synthetic quartz coat 28 of high purity on the inner wall of pipe 21. Various kinds of such quartz pipes are formed and united to a body by welding to obtain a multilayered quartz crucible.

公开(公告)号：JPS5480140A

公开(公告)日：1979-06-26

申请号：JP14790477

申请日：1977-12-08

Applicant: FUJITSU LTD

Inventor： KAWABATA YOSHIO ,  TATSUTA TAKASHI ,  GOTOU JIYUNJIROU ,  NISHIJIMA YOSHINDO

IPC: C03B37/018 ,  C03B19/14 ,  C03B37/014 ,  G02B6/00

Abstract: PURPOSE:To enable the soot be become multicomponent system galss stock to be formed at specified composition by repeatedly changing over different kinds of raw material vapors thereby causing them to react. CONSTITUTION:As a 3-way cock 4 is operated, POCl3, GeCl4 and carrier gas are introduced into a central nozzle 10 through conduit 2. Mixed soot 91' of P2O5, GeO2 then forms at a specified amount on the inside surface of a crucible 8 through flame hydrolysis. Next, the cock 4 is changed over, then GaCl3 which causes chemical reaction with POCl3 to form composite oxides and is liable to cause inconveniences in the burner part and carrier gas are introduced through conduit 3. Soot 92' of Ga2O3 then forms on the inside surface of the soot 91'. The crucible 8 which have been formed with respectively desired amounts of (P2O5+GeO2) and Ga2O3 alternately through repetition of such operations is heated, whereby the glass stock of 3 elements is obtained.

公开(公告)号：JPS53120447A

公开(公告)日：1978-10-20

申请号：JP3598577

申请日：1977-03-29

Applicant: FUJITSU LTD

Inventor： MIKI MASAJI ,  GOTOU JIYUNJIROU ,  TATSUTA TAKASHI

IPC: C03B37/023 ,  G02B6/00

Abstract: PURPOSE:To make the refractive index profile including that of a cladding correctly in accordance with the design, while maintaining the radius of a core glass at a preset value, by spinning after a crucible for core glass is inserted intoa crucible having glass material under a low viscous condition.

公开(公告)号：JPS63380B2

公开(公告)日：1988-01-06

申请号：JP7380581

申请日：1981-05-15

Applicant: FUJITSU LTD

Inventor： OKAMURA KOJI ,  TATSUTA TAKASHI

IPC: C03B20/00 ,  C03B37/012 ,  C03B37/018 ,  G02B6/00 ,  G02B6/024

公开(公告)号：JPS5973447A

公开(公告)日：1984-04-25

申请号：JP18583282

申请日：1982-10-21

Applicant: Fujitsu Ltd

Inventor： OKAMURA KOUJI ,  TATSUTA TAKASHI

IPC: C03B8/04 ,  C03B20/00 ,  C03B37/018 ,  G02B6/00

CPC classification number: C03B37/01846 ,  C03B37/01861

Abstract: PURPOSE:To obtain an optical fiber preform having high numerical aperture, in high yield, without causing cracking, by forming a solid preform after temporarily removing the exhaust-side supporting tube attached to the exhaust-side end of a reaction tube, at the deposition stage of the glass layer. CONSTITUTION:A glass layer constituting the optical path is formed on the inner surface of a reaction tube 1 used as a starting material by the chemical vapor deposition process, and the tube is collapsed to a rod having smaller cross- section by heating and melting to obtain an optical fiber preform. In the above process, the exhaust-side supporting tube 21 attached to the exhaust-side end of the reaction tube 1 is removed temporarily at the deposition stage of the glass layer, and the solid preform is formed. Thereafter, the tube is attached again to the revolving means 3 to continue the collapsing process.

Abstract translation: 目的：为了获得具有高数值孔径，高产率而不引起开裂的光纤预制件，通过在临时移除附着在反应管的排气侧端部的排气侧支撑管之后形成固体预制件，在沉积 玻璃层的阶段。 构成：通过化学气相沉积工艺在作为起始材料的反应管1的内表面上形成构成光路的玻璃层，并且通过加热熔化将管折叠成具有较小横截面的棒 获得光纤预制件。 在上述过程中，在玻璃层的沉积阶段临时移除安装在反应管1的排气侧的排气侧支撑管21，并形成固体预成型件。 此后，管再次附接到旋转装置3以继续塌缩处理。

公开(公告)号：JPS5832034A

公开(公告)日：1983-02-24

申请号：JP13135881

申请日：1981-08-20

Applicant: FUJITSU LTD

Inventor： OKAMURA KOUJI ,  GOTOU JIYUNJIROU ,  TATSUTA TAKASHI

IPC: C03B37/027 ,  C03B20/00 ,  C03B37/012 ,  G02B6/00 ,  G02B6/024

Abstract: PURPOSE:To prepare elliptical core type optical fibers having constant polarized waves easily, by fusing a form adjusting glass member to a base material for the optical fibers having a core and a clad parts having different refractive indexes in the long direction thereof, and drawing the resultant fused fibers under heating while integrating them. CONSTITUTION:Round bar form adjusting members 4 of the same material as a base material 3 are passed along both opposite sides in the long direction on the same diameter of the performed bar-shaped solid base material 3 for optical fibers constituted of a core part 1 and a clad part 2 and fused thereto. Assistant form adjusting glass members 5 of the same material as the form adjusting glass members 4 are passed along interstices 6 on both sides of the base material 3 and the form adjusting glass members 4 and fused thereto the give an assembly 7. The resultant assembly 7 is then fed into a heating furnace from the one end thereof gradually and spun at a given spinning speed while molten integrally under heating to afford the desired elliptical core type optical fibers having constant polarized waves.

公开(公告)号：JPS5820749A

公开(公告)日：1983-02-07

申请号：JP11552881

申请日：1981-07-22

Applicant: FUJITSU LTD

Inventor： GOTOU JIYUNJIROU ,  TATSUTA TAKASHI ,  TSUKAMOTO MAKOTO

IPC: C03C25/42 ,  C03B37/10 ,  G02B6/44

Abstract: PURPOSE:In passing an optical fiber through a molten metal in a crucible for covering, to apply a metal film with a uniform thickness to the continuous optical fiber successively, by inserting a rod for adjusting the liquid level of a molten metal to it so that the height of the light level is controlled. CONSTITUTION:A metal material is fed to the crucible 4 for covering until the molten metal 7 has the given height h of the liquid level and it is adjusted. The crucible 4 is heated by the furnace 8 at the desired temperature, and the optical fiber 3 drawn by the spinning means is inserted into a through hole at a constant speed. The liquid level of the molten metal 7 in the crucible 4 is reduced by this covering process, the rod 21 for adjusting the liquid level is inserted into the metal 8 by a distance corresponding to the reduction in the liquid level through the rod sending mechanism 22, so that the liquid level is kept at the given height h. Consequently, the amount of the metal sent to the insertion hole 6 is made constant, and the fiber 3 is covered with the metal having a uniform thickness.

公开(公告)号：JPS5820748A

公开(公告)日：1983-02-07

申请号：JP11552781

申请日：1981-07-22

Applicant: FUJITSU LTD

Inventor： GOTOU JIYUNJIROU ,  TATSUTA TAKASHI ,  OKAMURA KOUJI ,  TSUKAMOTO MAKOTO

IPC: C03C25/42 ,  C03B37/10 ,  G02B6/44

Abstract: PURPOSE:To cover the surface of optical fiber uniformly with a metal, by setting plural nozzles of outlet pipes of crucibles for metal covering at the same plane that is perpendicular to the optical fiber with placing the optical fiber to be coated with the metal at the center. CONSTITUTION:The optical fiber 3 to be coated is placed at the center, and the metal melting crucibles 4 and 4' charged with the metal covering material 7 and 7' set in the electric furnaces 8 and 8' respectively, for example, are positioned symmetrically on the supporting base 21 with putting the finely adjusting bases 22 and 22' finely movable in the horizontal direction and the supporting members 23 and 23 between them. The nozzles 6 and 6' of the outlet pipes 5 and 5' from the crucibles 4 and 4' are opposed each other with setting the fiber 3 at the center, and the bases 22 and 22' are adjusted in such a way that the protrusion parts 9 and 9' of molten metal projected from the nozzles 6 and 6' are integrated. The optical fiber 3 is inserted through the integrated protrusion part, to give easily the optical fiber 3' uniformly coated with the metal.

公开(公告)号：JPS5773704A

公开(公告)日：1982-05-08

申请号：JP15093080

申请日：1980-10-27

Applicant: Fujitsu Ltd

Inventor： GOTOU JIYUNJIROU ,  OKAMURA KOUJI ,  TATSUTA TAKASHI

IPC: C03B37/012 ,  C03B37/15 ,  G02B6/04 ,  G02B6/06

CPC classification number: C03B37/15

Abstract: PURPOSE:To form an optical fiber bundle having superior image transmission characteristics by blocking one terminal part of a glass pipe into which optical thin rods are inserted and by making through holes for discharging etching gas near the terminal part in the manufacture of the optical fiber bundle by bundling may optical thin rods in one body. CONSTITUTION:On the terminal part of a quartz glass pipe 1 is blocked with a blocking plate 21 and in a circumferential tube wall near it, small-diameter through holes 22 are made; and optical thin rods 3 each consisting of a core glass layer and a cladding glass layer are arrayed and inserted into the glass pipe 1 and at the other terminal part of the glass pipe 1, a gas introduction opening 5 is formed. Then, the glass pipe 1 is heated and etching gas (e.g. BBr3) is introduded from the introduction opening 5 and discharged from the through holes 22 to each away dirt on the surface of the optical thin rod 3, and the pipe is made solid by being heated by a heating means (e.g. oxyhydrogen burner) 6 to form an optical bundle having none of mixed air bubbled, foregin matter, etc.

Abstract translation: 目的：通过在光纤束的制造中封闭插入有光学细棒的玻璃管的一个端子部和通过在端子部附近排出蚀刻气体的通孔来形成具有优异的图像传输特性的光纤束 通过捆绑可以将光学细棒放在一体内。 构成：在石英玻璃管1的端子部分被阻挡板21封闭，并在其周围的圆周管壁上形成小直径的通孔22; 将由芯玻璃层和包层玻璃层构成的光学细棒3排列并插入到玻璃管1中，在玻璃管1的另一端部形成有气体导入开口5。 然后，玻璃管1被加热，并且从引入开口5引入蚀刻气体（例如BBr3），并且从通孔22排出到每个远离光学薄棒3的表面上的污垢，并且通过 被加热装置（例如氢氧化物燃烧器）6加热以形成没有混合空气鼓泡，前体物质等的光束。

公开(公告)号：JPS5735806A

公开(公告)日：1982-02-26

申请号：JP11152180

申请日：1980-08-12

Applicant: Fujitsu Ltd

Inventor： OKAMURA KOUJI ,  GOTOU JIYUNJIROU ,  TATSUTA TAKASHI

IPC: C03B37/028 ,  G02B6/04

CPC classification number: C03B37/028

Abstract: PURPOSE:To make the intermediate part of an optical fiber bundle flexible by a simple method by forming a linear melt-sticking part between multicore rods while controlling spinning temperature low, and by decomposing and separating the melt- sticking part with fluoric acids, etc., after spinning. CONSTITUTION:Quartz-thread multicore rods 1 are bundled in two stages each of five rods, and then spinned into a sheet in an electric furnace 2 while the turning speeds of rollers 3 are adjusted. In this case, the spinning temperature is controlled low enough to limit melt-sticking between the multicore rods, and the multicore rods are connected linearly. The intermediate part of the thus spinned optical fiber bundle is dipped in a fluoric acid solution to be dissolved. Consequently, the connection part is dissolved easily without spoiling the functions of the optical fiber to provide flexibility.

Abstract translation: 目的：通过简单的方法使光纤束的中间部分通过在多芯棒之间形成线性熔融粘合部分，同时控制纺丝温度低，并通过氟化酸分解和分离熔融部分等来实现柔性。 ，旋转后。 构成：石英螺纹多芯棒1分两个阶段捆扎成五个棒，然后在电炉2中旋转成片，同时调整辊3的转动速度。 在这种情况下，纺丝温度被控制得足够低以限制多芯棒之间的熔融粘附，并且多芯棒线性连接。 将如此旋转的光纤束的中间部分浸入氟酸溶液中以溶解。 因此，连接部分容易溶解，而不损害光纤的功能以提供灵活性。