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1. 发明专利

JPS589839A COATING OF OPTICAL FIBER 失效
公开(公告)号：JPS589839A
公开(公告)日：1983-01-20
申请号：JP10426281
申请日：1981-07-03
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： KIMURA TAKAO , NISHIMURA MASAO , NISHIMOTO MASAYUKI , FUSE KENICHI
IPC分类号： C03C25/10 , C03C25/12 , G02B6/44
摘要： PURPOSE:To improve the uniformity of the coating thickness and to prevent the damage of an optical fiber with external force, by passing the optical fiber before the coating operation through a device for aligning the fiber using the flow of gas, thereby keeping the optical fiber to the proper position in the coating vessel. CONSTITUTION:The perform rod 10 as raw material of an optical fiber is heated and molten in a spinning furnace 1 and drawn to an optical fiber 11. The fiber 11 is passed through the aligning device 2 and the coating vessel 3, and coated with a coating material such as silicone rubber, epoxy resin, etc. In the above procedure, an inert gas such as Ar, He, N, etc. is introduced into the aligning device 2 from the gas inlets 6A and 6B and blasted through the upper and the lower aligning orifices 8A and 8B. The optical fiber 11 is supported stably at the center of the aligning orifices 8A and 8B by the flow of the gas, and is passed accurately at the center of the die 4 of the coating vessel 2 aligned with the aligning device 2. Accordingly, the uniformity of the thicknss of the coating layer 13 is improved, and the damage of the optical fiber caused by the contact with the inner wall of the die can be prevented.

2. 发明专利

JPS6061709A COVERED OPTICAL FIBER 失效
公开(公告)号：JPS6061709A
公开(公告)日：1985-04-09
申请号：JP17018683
申请日：1983-09-14
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NISHIMURA MASAO , KITAMURA AKIRA , HORI HISAKO , WADA NAOYUKI , ORIMO KATSUMI , INAGAKI NOBUO , KIMURA TAKAO
IPC分类号： C03C25/10 , G02B6/44
摘要： PURPOSE:To prevent an increase of a transmission loss caused by hydrogen of a covered layer of a quartz compound optical fiber by making the covered layer contain a compound having a reactivity to hydrogen. CONSTITUTION:In a covered optical fiber 10, a covered layer 4 is formed on the outside circumference of a covered layer 2. The covered layer 2 has one or both functions of primary coat and buffer coat, and the covered layer 4 has a protective function whose mechanical characteristic is excellent. When a prescribed compound is contained in the covered layer 2 and/or the covered layer 4, the prescribed compound reacts to hydrogen and comes to catch it, and accordingly, even if a lattice defect exists in an optical fiber, the caught hydrogen cannot invade into its optical fiber 1, by which an OH radical is not generated, therefore, a covered optical fiber whose transmission characteristic is stable is obtained extending over a long period of time in which an increase of a transmission loss is scarcely generated. As for the prescribed compound, namely, a compound having a reactivity to hydrogen, it is desirable to use that of a suit able material quality by adjusting it to a suitable quantity, and an organic peroxide can be exemplified. As for a content of the organic peroxide, 0.01- 5wt% is desirable against the covered layer containing it.

3. 发明专利

JPS58104046A COATING METHOD OF GLASS FIBER 失效
公开(公告)号：JPS58104046A
公开(公告)日：1983-06-21
申请号：JP20310881
申请日：1981-12-16
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： KIMURA TAKAO , NISHIMURA MASAO , YOSHIDA KAZUAKI , NAMIKAWA TAKASHI , SATOU TSUGIO
IPC分类号： B01D15/08 , B05D1/36 , C03B37/075 , C03B37/10 , C03C25/10 , G01N30/60 , G02B6/44
摘要： PURPOSE:To form a coating layer of uniform thickness on the outer periphery of a glass fiber without causing flaws on the surface of the glass fiber due to the contact accidents, etc., by passing the glass fiber through a coating material prepared in the form of a liquid droplet or liquid film by the surface tension thereof. CONSTITUTION:A rod-like base material (10a) for glass is spun into, an optical fiber or glass fiber (10b), e.g. a capillary tube, by a heating furnace 1, passed through a liquid droplet material (11a) of a coating material 11, fed from a storage tank 7 of a coating apparatus 6, and kept at the tip of a feed capillary 8 and then heat-treated in a curing or drying heating furnace 2 to give a primarily coated fiber (10c). The resultant coated fiber (10c) is then passed through a high polymeric coating material 12 in a coating tank 3 having a die 4 and heat-treated in a curing heating furnace 5 to afford the secondarily coated fiber (10d). The coating material 11 to be kept in the feed capillary 8 may be formed in a liquid film, and the glass fiber (10b) may be passed perpendicularly through the liquid film. A surfactant, releasing agent, high polymer, etc. may be used if necessary as the coating material 11.

4. 发明专利

JPS57140333A COATING METHOD FOR OPTICAL FIBER 失效
公开(公告)号：JPS57140333A
公开(公告)日：1982-08-30
申请号：JP2531881
申请日：1981-02-23
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： KIMURA TAKAO , SHIBUYA SEIJI , KOMATSU WATARU , SATOU TSUGIO
IPC分类号： C03C25/10 , C03B37/027 , C03C25/18 , G02B6/44
摘要： PURPOSE:To reduce the size of an apparatus and to obtain a coated layer with no change in thickness by passing an optical fiber immediately after spinning through a fluid for cooling and a coating agent packed in the same die container in 2 layers. CONSTITUTION:A perform rod 1 is melted by heating at about 2,000 deg.C with a heating furnace 2 and spun into an optical fiber 3 having about 1mm. outside diameter. The hot fiber 3 immediately after the spinning is passed through a die container 4 having a die at the outlet at about 15m/min drawing speed. The container 4 is supplied with a coating agent 6 such as silicone resin from a supply inlet 7 under pressure with a pump or the like, and a fluid 5 for cooling such as ethanol which has lower specific gravity than the agent 6 and does not react with the agent 6 is circulated between an inlet 8 and an outlet 9 while cooling. By feeding gaseous N2 from an inlet 10, the ignition of the fluid 5 is prevented.

5. 发明专利

JPS5795844A MANUFACTURE OF DIES FOR COATING OPTICAL FIBER 失效
公开(公告)号：JPS5795844A
公开(公告)日：1982-06-14
申请号：JP17069580
申请日：1980-12-03
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： KIMURA TAKAO , SATOU TSUGIO , KOMATSU WATARU
IPC分类号： C03C25/12 , B29C45/00 , B29C55/00 , B29C61/00 , B29C61/02 , B29C61/06 , G02B6/44
摘要： PURPOSE:To manufacture accurately and inexpensively dies capable of coating an optical fiber without deteriorating various characteristics of the fiber by heating and working part of a heat shrinkable plastic tube to form a smaller diameter part having a desired length and by using the other parts as larger diameter parts. CONSTITUTION:A core wire 2 made of heat resistant metal, glass or the like is put in a heat shrinkable plastic tube 1 made of fluororesin, cross-linked polyolefin or the like, and an intermediate part of the tube 1 in the longitudinal direction is heated to a prescribed temp. with a heater 3. At the same time, the tube 1 is extended in the arrow directions to actively heat-shrink the intermediate part. This tube 1 is then cut to obtain 2 dies 6 each consisting of a smaller diameter part 4 having an inside diameter decided by the wire 2 and of a larger diameter part 5. By attaching the die to the outlet of a coating vessel set between a heating furnace for spinning an optical fiber and a coat curing furnace, the optical fiber can be coated desirably.

6. 发明专利

JPS6046953A TREATMENT OF COVERED OPTICAL FIBER 失效
公开(公告)号：JPS6046953A
公开(公告)日：1985-03-14
申请号：JP15524383
申请日：1983-08-25
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NISHIMURA MASAO , WADA NAOYUKI , YOSHIDA KAZUAKI , ORIMO KATSUMI , KIMURA TAKAO , NAKAHARA MOTOHIRO , INAGAKI NOBUO
IPC分类号： C03C25/10 , G02B6/44
摘要： PURPOSE:To obtain covered optical fiber having reliability for a long period, by subjecting covered optical fiber coated with a thermosetting resin to contact reaction with water, heat-treating it. CONSTITUTION:The outer periphery of the optical fiber 2 consisting of core and clad is covered with a thermosetting or photosetting resin (e.g., two-pack cold- vulcanizable silicone rubber) to form the covered layer 3, it is subjected to contact reaction with water at 100-150 deg.C for 2-200hr, so that >=0.1wt% water is absorbed in the covered layer 3. The optical fiber 2 is introduced to the outer cylinder 11 of the furnace 10, heated in an inert gas atmosphere sent throught the gas inlet pipe 15 by the heater 19, it is fed to the inner cylinder 12, sucked through the suction pipe 18, volatile components evolved in the covered layer 3 are removed, and the covered layer 4 consisting of a thermoplastic resin is then formed on the outer periphery of the covered layer 3.

7. 发明专利

JPS6046512A PLASTIC COATED OPTICAL FIBER 失效
公开(公告)号：JPS6046512A
公开(公告)日：1985-03-13
申请号：JP15524283
申请日：1983-08-25
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NISHIMURA MASAO , ODA MIKIO , KOKAYU MIKIO , YOSHIDA KAZUAKI , ORIMO KATSUMI , KIMURA TAKAO , NAKAHARA MOTOHIRO , INAGAKI NOBUO
IPC分类号： C03C25/10 , G02B6/44
摘要： PURPOSE:To decrease considerably the transmission loss that may increase as a result of long-term holding at elevated temp. by forming buffer layer of a silicone resin which is a specific organosiloxane compsn. having a reactive group. CONSTITUTION:A buffer layer 12 of a coated optical fiber 10 consists of a silicone resin such as silicone rubber which may be of a thermosetting type and for which a resin of a photosetting type is mainly used. The layer 12 consists of the hardened matter of an organosiloxane compsn. having a reactive group. The compsn. which is liquid in an uncured state but the group expressed by the formula is not substantially included in the molecules of said organosiloxane. The transmission loss that may increase as a result of long-term holding, etc. at elevated temp. is thus considerably decreased.

8. 发明专利

JPS589840A PRIMARY COATING OF OPTICAL FIBER 失效
公开(公告)号：JPS589840A
公开(公告)日：1983-01-20
申请号：JP10426381
申请日：1981-07-03
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： KIMURA TAKAO , NISHIMURA MASAO , OOISHI YOSHIAKI
IPC分类号： C03C25/10 , C03B37/10 , G02B6/44
摘要： PURPOSE:To apply a coating layer having uniform thickness to an optical fiber, by passing an optical fiber heated at or above the melting point of the coating resin through a die filled with powdery thermoplastic coating resin. CONSTITUTION:The glass preform 1 used as the raw material of an optical fiber is heated and molten with a heating furnace 2 and drawn to an optical fiber 3. The fiber 3 is heated at or above the melting point of the coating material 6 with a preheating furnace 4 and passed through the die 5. The die is filled with a powdery thermoplastic resin 6 such as nylon, polyethylene, etc. as the coating material. The coating resin powder 6 is pressed to the surface of the running optical fiber 3 with the rollers 8, 9, molten with the heat of the fiber 3, and applied to the surface. The coated fiber is passed through the heating furnace 10 to smoothen the surface of the coating layer and to form a thin uniform coating layer.

9. 发明专利

JPS6090854A METHOD FOR COATING OPTICAL FIBER 失效
公开(公告)号：JPS6090854A
公开(公告)日：1985-05-22
申请号：JP19713083
申请日：1983-10-21
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NISHIMURA MASAO , NISHIMOTO MASAYUKI , KATOU KOUJI , YOSHIDA KAZUAKI , KIMURA TAKAO , INAGAKI NOBUO
IPC分类号： C03C25/10 , G02B6/44
摘要： PURPOSE:To improve the temp. characteristics of an optical fiber by coating the fiber with uncured photosetting resin and curing the resin at a prescribed temp. CONSTITUTION:An uncured coating layer of photosetting resin is formed around an optical fiber after primary coating. The coating layer is kept at

10. 发明专利

JPS57135739A MANUFACTURING OF OPTICAL FIBER 失效
公开(公告)号：JPS57135739A
公开(公告)日：1982-08-21
申请号：JP1943481
申请日：1981-02-12
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： KIMURA TAKAO , NISHIMURA MASAO
IPC分类号： C03B37/027 , C03C13/04 , G02B6/44
摘要： PURPOSE:To anneal the surface flaws of an optical fiber without causing the change of diameter nor deterioration of the transmission characteristics, and to improve the strength of the optical fiber, by spinning a preform rod cladded with a low-softening point layer, and reheating the spun fiber. CONSTITUTION:A preform rod is manufactured by the vapor-phase deposition of the layer 11 which forms a part of clad and the core part 12 to the inside of the quartz tube 10 used as starting raw material. The outer surface of the quartz tube 10 is clad with the low-softening point layer consisting of quartz glass doped with P2O5 etc. and having lower softening point than the quartz tube 10. Then, the cavity 14 is collapsed and at the same time, the low-softening point layer 13 is vitrified, and the preform rod is molten and drawn to a small diameter fiber. The fiber is reheated at a temperature higher than the softening point of the low-softening point layer 13 to obtain an optical fiber.

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