公开(公告)号：JPS57208509A

公开(公告)日：1982-12-21

申请号：JP9446781

申请日：1981-06-17

Applicant: FUJITSU LTD

Inventor： GOTOU JIYUNJIROU ,  TATSUTA TAKASHI ,  TSUKAMOTO MAKOTO

IPC: H01B13/22 ,  C03C25/20 ,  C03C25/42 ,  G02B6/44

Abstract: PURPOSE:To easily adjust the position of a molten metal outlet opening from a crusible in a heating furnace, and to uniform the metallic coating thickness of an optical fiber, by mounting the crusible on a fine adjustment table in such a way that the tip part of the lead-out pipe of the crusible is led out of the furnace. CONSTITUTION:At the side part of a crusible 4 for metal coating, a led-out pipe 5 having a molten metal outlet opening 6 at the tip is projected, and this crusible 13 is heated in a heating furnace 13 to melt a metal coating material 7 in the crusible 4; and an optical fiber wire 3 is passed through the molten metal swelling out of the outlet opening 6 of the lead-out pipe 5, and thus the optical fiber wire 3 is coated with metal to obtain a wire 3'. In this case, the crusible 4 is placed on a fine adjustment table 12 capable of moving finely and horizontally in the heating furnace 13 in such a way that the tip part 6 of the lead-out pipe 5 is led out of the furnace. Therefore, the thickness of the metallic coating of the wire 3 is made uniform.

公开(公告)号：JPS57188426A

公开(公告)日：1982-11-19

申请号：JP7380581

申请日：1981-05-15

Applicant: FUJITSU LTD

Inventor： OKAMURA KOUJI ,  TATSUTA TAKASHI

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

Abstract: PURPOSE:To easily manufacture an optical fiber having a desired elliptical core part by depositing a glass film for the core of the fiber on the inner wall of a hollow glass pipe, making the section of the pipe elliptical, grinding the outside to a perfectly round shape, and heating and drawing the pipe. CONSTITUTION:On the inner wall of a perfectly round hollow glass pipe a glass film for a core part having a higher refractive index than the glass pipe is deposited by a vapor phase chemical reaction, and after evacuating the glass pipe, the pipe is melted by heating and bonded to the glass film so as to make the cross-section of the pipe elliptical. Thus, a base material 3 composed of a solid rodlike core part 1 having the desired elliptical shape and a clad layer 2 is obtd. The outside of the material 3 is then polished to a perfectly round shape. By attaching the resulting base material 3' to a spinning device and spinning it at a prescribed drawing rate, and optical fiber composed of a perfectly round clad layer 22 and an elliptical core part 21 can be obtd. easily. This fiber can transmit a photo signal having a prescribed polarizing face without rotating the polarizing direction.

公开(公告)号：JPS57125908A

公开(公告)日：1982-08-05

申请号：JP1212781

申请日：1981-01-28

Applicant: Fujitsu Ltd

Inventor： OKAMURA KOUJI ,  GOTOU JIYUNJIROU ,  TATSUTA TAKASHI

IPC: C03B37/00 ,  G02B6/04 ,  G02B6/06 ,  G02B5/17

CPC classification number: G02B6/06

Abstract: PURPOSE:To provide high resolution with accurate configuration by forming a coating layer thicker than the outside diameter of an optical fiber on said fiber, aligning plural pieces of such coated optical fibers, and forming these into one body while pressurizing the parts near the end parts in the direction intersecting orthogonally with the long axis of the fibers and while holding the coating layers partly removed. CONSTITUTION:A coating layer 2 thicker than the outside diameter of an optical fiber made of quartz glass is provided with a synthetic resin or metal on the outside circumference of an optical fiber 1 consisting of a core 1a for said fiber and a low refractive index glass layer (clad) on the outside circumference thereof. Plural pieces of such coated optical fibers are aligned, and while the parts near the end parts thereof are pressurized in the direction intersecting orthogonally with the long axis direction of the fibers, the layers 2 are dissolved off. In the case of the synthetic resin layers 2, they are removed with a solvent for the same and in the case of the metallic layers 2, they are removed with an aq. soln. of acid or the like. Next, the layers 2 left without dissolution are heated to soften, whereby the end parts formed into one body are obtained. In this way, the bundle arranged accurately with a large number of the optical fibers in both end parts (a), (b) and suited for image transmission requiring high resolution and high fidelity is obtained.

Abstract translation: 目的：通过在所述纤维上形成比所述光纤的外径更厚的涂层来提供高分辨率的精确配置，将多片这样的涂覆光纤对准，并将其形成为一体，同时对端部附近的部分加压 在与纤维的长轴正交相交的方向上，同时保持涂层部分地被去除。 构成：比由石英玻璃制成的光纤的外径厚的涂层2在由用于所述纤维的芯1a和低折射率玻璃构成的光纤1的外周上设置有合成树脂或金属 层（包层）。 这些涂覆的光纤的多个片段被对准，而其端部附近的部分沿着与纤维的长轴方向正交交叉的方向加压，层2被溶解掉。 在合成树脂层2的情况下，用溶剂除去合成树脂层2，在金属层2的情况下，用水溶液除去。 索恩 的酸等。 接下来，将不溶解的层2加热软化，由此得到形成为一体的端部。 以这种方式，可以获得在两端部（a），（b）中准确地配置大量光纤并且适合于需要高分辨率和高保真度的图像传输的束。

公开(公告)号：JPS5742006A

公开(公告)日：1982-03-09

申请号：JP11889780

申请日：1980-08-27

Applicant: Fujitsu Ltd

Inventor： GOTOU JIYUNJIROU ,  OKAMURA KOUJI ,  TATSUTA TAKASHI

IPC: C03B37/00 ,  G02B6/04 ,  G02B6/06

CPC classification number: G02B6/06

Abstract: PURPOSE:To make the titled optical fiber bundle adaptable to heat resistant fiber scopes for high heat devices and the like by putting glass tubes or required length on both end parts bundled with plural pieces of optical fibers, and uniformly heating the outside circumferential walls of the tubes thereby melt-sticking the glass in one body to the optical fibers. CONSTITUTION:Striplike aggregate bundles 2, which are paralleled with optical fibers (particularly of silica system) 1, are tentatively secured and are cut, are put into a forming jig with both end parts being superposed, and further the respective bundles 2 are tentatively adhered and their end parts 3 are inserted into quartz glass tubes 4 of required length. The outside circumferences of the tubes 4 are then uniformly heated to soften and shrink with an oxyhydrogen burner or the like whereby they are melt-stuck to the outside circumferences of the end parts. This yields the end parts 3' which are formed in one body without deviation in the arrangement of the fibers 1. Both end faces are then precisely polished to make optical image transmission and reception surfaces, whereby the fire-resistant optical fiber bundle 5 having the heat resistant and mechanically tough receiving end faces for observation of the inside of blast furnaces and the like is obtained.

Abstract translation: 目的：通过将玻璃管或所需长度放置在与多根光纤捆绑在一起的两端部分上，使标题光纤束适用于高温装置等的耐热纤维范围，并均匀加热 从而将一个体中的玻璃熔融粘附到光纤上。 构成：与光纤（特别是二氧化硅系统）1并联的线状骨料束2暂时固定并切割，放入具有两个端部重叠的成形夹具中，并且进一步将各束2临时粘合 并将它们的端部3插入所需长度的石英玻璃管4中。 然后将管4的外圆周均匀地加热以用氢氧燃烧器等软化和收缩，由此它们熔融粘附到端部的外周。 这产生了在一个主体中形成的端部3'，而纤维1的布置没有偏差。然后两个端面被精确抛光以形成光学图像传输和接收表面，由此具有 获得用于观察高炉内部等的耐热和机械强度接收端面。

公开(公告)号：JPS5734041A

公开(公告)日：1982-02-24

申请号：JP10561780

申请日：1980-07-30

Applicant: Fujitsu Ltd

Inventor： NAKAMURA OSAMU ,  GOTOU JIYUNJIROU ,  TATSUTA TAKASHI

IPC: C03C3/06 ,  C03C3/062 ,  C03C3/16 ,  C03C13/00 ,  C03C13/04 ,  G02B6/00

Abstract: PURPOSE:To prepare an optical fiber having excellent water resistance and chemical stability and large numerical aperture, by covering the outer circumference of the core made of a specific phosphate glass with the clad layer made of quartz glass. CONSTITUTION:The core made of a phosphate glass devoid of the oxide of the I-group or II-group positive elements, is coated with a clad layer made of quartz glass to obtain a glass fiber for light transmission. For example, a slurry of glass- forming oxide obtained by adding highly pure Ga2O3, GeO2 and SiO2 to H3PO4 prepared by the reaction of POCl3 with pure water, is pressed into a quartz tube with high pressure O2 gas, and elongated from the bottom of the tube to obtain the optical fiber. The H3PO4 mixture forms the core. The transparency of the clad layer can be improved and the interface between the core and the clad can be maintained clean to obtain a low-loss optical fiber, by introducing SiCl4 and O2 gas into the quartz tube which becomes the clad layer, thereby coating the inner wall of the quartz tube with highly pure quartz glass layer.

Abstract translation: 目的：制备具有优异的耐水性，化学稳定性和大数值孔径的光纤，用由石英玻璃制成的包覆层覆盖由特定磷酸盐玻璃制成的芯的外周。 构成：由不含I族或II族正构元素的氧化物的磷酸盐玻璃制成的核被涂覆有由石英玻璃制成的覆层，得到用于透光的玻璃纤维。 例如，通过将POCl 3与纯水反应制备的H 3 PO 4加入高纯度的Ga 2 O 3，GeO 2和SiO 2获得的玻璃形成氧化物的浆料被压入具有高压O 2气体的石英管中，并且从底部延伸 管子获得光纤。 H3PO4混合物形成核心。 通过将SiCl 4和O 2气体引入作为包覆层的石英管中，可以提高包层的透明性，并且可以保持芯和包层之间的界面清洁以获得低损耗光纤，从而涂覆 石英管内壁采用高纯石英玻璃层。

公开(公告)号：JPS56167110A

公开(公告)日：1981-12-22

申请号：JP7208680

申请日：1980-05-28

Applicant: FUJITSU LTD

Inventor： GOTOU JIYUNJIROU ,  OKAMURA KOUJI ,  TATSUTA TAKASHI

IPC: C03B37/012 ,  G02B6/04 ,  G02B6/06 ,  G02B5/17

Abstract: PURPOSE:To transmit optical images with fidelity by preventing optical fibers from being disordered in array and deforming, by inserting optical transmission lines into each gap of an intermediate assembly consisting of many optical fibers. CONSTITUTION:Optical fibers 1 which are each composed of a core layer and cladding layer are bundled and elongated in one body to form intermediate assemblies 2-2''. Into each mutual gap of those intermediate assemblies 2-2'', optical transmission lines 21 less in diameter than the intermediate assemblies are inserted closely and then the entirety is united by thermal press-contacting. Thus, the transmission area of an optical fiber bundle, i.e. core parts avoid deformation and a disordered array, transmitting distortion-free optical images with fidelity.

公开(公告)号：JPS56161509A

公开(公告)日：1981-12-11

申请号：JP6562180

申请日：1980-05-16

Applicant: FUJITSU LTD

Inventor： GOTOU JIYUNJIROU ,  OKAMURA KOUJI ,  TATSUTA TAKASHI

IPC: C03B37/014 ,  C03B37/027 ,  C03B37/028 ,  G02B6/04

Abstract: PURPOSE:To obtain an optical fiber bundle having an even diameter without twist, by holding the upper end of a preform in which plural optical fibers are aligned and unified with a freely rotatable holding tool within a plane vertical to the shaft of the preform and then elongating by heating the upper end of the preform successively from the other end of the preform. CONSTITUTION:The upper end of a preform 1 in which several hundreds of optical fibers are bundled into a body is attached to a holding tool 2 on the face vertical to the shaft of the preform. The tool 2 is born by a fixed bearing 3 in a free rotating way ans within a horizontal face at its grip part 2a. The bearing 3 contains a ball bearing 8 at a contact part of the part 2a and the bearing 3 to ensure a smooth rotation. The preform 1 is heated and softened in a longitudinal electric oven 4 successively at the other end of the preform to be extended outside the oven through a lead-out roller 5 and then to be formed into a thin rod type intermediate aggregate 6 having an even diameter. Thus the tool 2 can follow the rotation of the aggregate 6 if caused by an irregular rotation, vibrations and the like of the roller 5. As a result, a twist is avoided for the aggregate 6.

公开(公告)号：JPS56138708A

公开(公告)日：1981-10-29

申请号：JP4326180

申请日：1980-03-31

Applicant: FUJITSU LTD

Inventor： GOTOU JIYUNJIROU ,  OKAMURA KOUJI ,  TATSUTA TAKASHI

IPC: C03C25/10 ,  C03B37/012 ,  G02B6/00 ,  G02B6/04

Abstract: PURPOSE:To obtain an optical fiber bundle having superior transmission characteristics by providing a porus glass partition plate at one end of a glass tube, inserting plural pieces of fine optical rods in a closely contacting state into the tube from the other end, then etching the surface of the fine optical rods to clean them, thence stretching these under heating. CONSTITUTION:In the production of optical fibers for constituting optical transmission lines having multicores, image guides of high resolution, etc., a porous glass partition plate 2 through which gas can flow is mounted to one end part of a hollow quartz tube or glass tube 1. Several hundred pieces of fine optical rods 3 having clad layers and core glass layers are densely inserted into the tube 1 from the other end. A gas inflow pipe 4 and an exhaust pipe 5 are provided to both ends of the tube 1, and the tube 1 is mounted to a glass lathe then the etching gas such as BBr3, BF3 or Cl2 is introduced. While the tube is being rotated, it is heated, to etch the surface of the fine bars 3 to remove their stains, flows, etc., thereafter, gaseous He or the like is fed therein and the gas is exhausted. Thence, the tube is made solid by a heating means 6 from the end part, whereby the superior optical fiber parent material free from any foreign material and foam is obtained. This parent material is stretched, whereby the superior optical fiber bundle is obtained.

公开(公告)号：JPS56111806A

公开(公告)日：1981-09-03

申请号：JP1504880

申请日：1980-02-08

Applicant: FUJITSU LTD

Inventor： GOTOU JIYUNJIROU ,  NAKAMURA OSAMU ,  OKAMURA KOUJI ,  TATSUTA TAKASHI

IPC: G02B6/04 ,  G02B6/06

Abstract: PURPOSE:To suit a light guide element to a fiberscope, etc., with excellent separation into the background and picture, by providing a metal-containing silica glass layer, absorbing light of specific wavelength, around a fibrous light transmission line. CONSTITUTION:Individual solid wire f1 in a group of light transmission wires f1-f4 is formed of core 1 consisting essentially of silica and coating layer 2 of sliica with added P2O5 and B2O3 and outside of it, light absorptive leakage-preventive layer 3 having added Ti , etc., is provided. A fiberscope or the like obtained by bundling this solid wire f1 allows a picture to be seen clearly enough because visible rays are transmitted through solid wires f1-f4, and also allows it to be seen nealry in violet because the existence of Ti permits the long-wavelength part of visible rays to be absorbed among solid wires f1-f4, so that it can be made clear to discriminate between the background and picture. Further, this leakage-preventive layer 3 adheres well to solid wires f1-f4 and its coefficient of thermal expansion is close to that of coating layer 2, so that it can easily be handled in the process of manufacture.

公开(公告)号：JPS5696222A

公开(公告)日：1981-08-04

申请号：JP17189379

申请日：1979-12-28

Applicant: FUJITSU LTD

Inventor： NISHIJIMA YOSHINDO ,  KAWABATA YOSHIO ,  TATSUTA TAKASHI

IPC: G01F23/292 ,  G01F23/28

Abstract: PURPOSE:To obtain easily an optical fiber controlled for OD ratio of a core to a cladding at a given value by detecting a position whereat a reflected light according to a change in a reflected light path which is resultant from fluctuation of a fused glass level arrives with a plurality of detecting elements. CONSTITUTION:There are provided a laser beam source 10 irradiating levels 11, 12 of a fused glass diagonally and a light receiving unit 13 consisting of a plurality of detecting elements which receives a light reflected on the level 11, 12. A position whereat the reflected light according to a change in a reflected light path which is result-and from the level 11 fluctuating to the level 12 is detected on the detecting elements. The levels 11, 12 of fused glass are thus detected easily, a rate of feeding a core forming glass rod and a cladding forming glass rod and a spinning rate of an optical fiber are adjusted according to the detected information, and thus the optical fiber controlled for OD ratio of a core to a cladding at a given value can be formed easily.