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1. 发明专利

JPS60200820A MANUFACTURE OF SYNTHETIC QUARTZ 失效
公开(公告)号：JPS60200820A
公开(公告)日：1985-10-11
申请号：JP5375384
申请日：1984-03-21
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： SHIBUYA SEIJI , SATOU TSUGIO , KOMATSU WATARU , TAGUCHI EIICHI , INAGAKI NOBUO
IPC分类号： C01B33/12 , C03B37/014 , C03C3/06
摘要： PURPOSE:To obtain synthetic quartz contg. no residual Cl while using inexpensive SiCl4 easy to handle as a starting material by heat treating porous soot at a high temp. in a steam atmosphere. CONSTITUTION:Soot 3 formed by a VAD method using SiCl4 as a starting material is held in an electric furnace kept at 1,000 deg.C, and air passed through water 4 by bubbling is fed to the furnace 1 for 2hr. After stopping the feed, the furnace 1 is filled with an He atmosphere, the temp. of the furnace 1 is raised to 1,200 deg.C, and the soot 3 is allowed to stand for 2hr. The temp. of the furnace 1 is then raised to 1,500 deg.C at 100 deg.C/hr rate to convert completely the soot 3 into transparent glass. The concn. of OH groups in the resulting synthetic quartz is 10ppm, and Cl is not detected. When the synthetic quartz is formed into a fiber by a rod-in-tube method, the fiber has such radiation resistance that the loss is increased by 5dB/km at 0.85mum wavelength under 10 rad irradiated gamma-rays.

2. 发明专利

JPS58135148A METHOD OF GENERATING RAW MATERIAL GAS FOR GLASS 失效
公开(公告)号：JPS58135148A
公开(公告)日：1983-08-11
申请号：JP1735282
申请日：1982-02-05
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： SENDA KAZUNORI , SHIBUYA SEIJI , SATOU TSUGIO , KOMATSU WATARU
IPC分类号： C03B37/018 , B01J7/00 , B01J19/10 , C03B8/04 , C03B37/014 , C03C1/00 , C03C3/06 , C03C13/04 , G02B6/00
摘要： PURPOSE:To generate a raw material gas for glass used for preparing a base material for optical fibers, etc. efficiently without the contamination with impurities, by subjecting a solution of a raw material for glass in a raw material vessel indirectly to the ultrasonic vibration, and atomizing the solution of the raw material for the glass. CONSTITUTION:A raw material vessel 1 containing a solution 8 of a raw material for glass is dipped in a liquid tank 2 containing a liquid 9, e.g. water, and an ultrasonic vibrator 3' of an ultrasonic generator 3 is mounted in a recess 10 provided on the outer surface of the base of the liquid tank 2. The ultrasonic generator 3 is then operated to propagate the ultrasonic vibration energy from the ultrasonic vibrator 3' to the liquid 9 in the liquid tank 2, vibration propagating part 7 of the raw material vessel 1 and then the solution 8 of the raw material for the glass one after another and atomize the solution 8 of the raw material for the glass by the ultrasonic vibration. A carrier gas is simultaneously introduced from an introductory pipe 4 into the raw material vessel 1 to support the raw material for the glass on the atomized gas, and supply the raw material gas from an outlet pipe 5 to a given position.

3. 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.

4. 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.

5. 发明专利

BR8304221A 未知
公开(公告)号：BR8304221A
公开(公告)日：1984-03-13
申请号：BR8304221
申请日：1983-08-05
申请人： FURUKAWA ELECTRIC CO LTD
发明人： SHIBUYA SEIJI , SATO TUGUO , KOMATSU WATARU , SHIMIZU TAKEO
IPC分类号： G02B6/06 , G02B5/17

6. 发明专利

CA1247900A IMAGE FIBER AND METHOD OF FABRICATING BASE MATERIAL FOR THE SAME 未知
公开(公告)号：CA1247900A
公开(公告)日：1989-01-03
申请号：CA433969
申请日：1983-08-05
申请人： FURUKAWA ELECTRIC CO LTD
发明人： SHIBUYA SEIJI , SATOH TUGUO , KOMATSU WATARU , SHIMIZU TAKEO
IPC分类号： G02B6/06 , G02B6/00 , B29C73/00 , B29C73/34 , B29D11/00 , C03B37/014 , C03B37/018 , G02B6/04 , G02B6/10 , G02B6/16 , G02B6/42 , G02B6/44
摘要： The invention provides an image fiber and a method for fabricating a base material therefor. By arranging optical fiber strands at random pinholes or dislocations of the core arrangement, as seen in cross section of the image fiber, do not result. This gives a marked reduction in the moire produced when the image fiber is connected to a TV camera.

7. 发明专利

JP2003137587A METHOD FOR DRAWING OPTICAL FIBER 审中-公开
公开(公告)号：JP2003137587A
公开(公告)日：2003-05-14
申请号：JP2001338234
申请日：2001-11-02
申请人： FURUKAWA ELECTRIC CO LTD
发明人： KOMATSU WATARU , ITO KYOICHI
IPC分类号： G02B6/00 , C03B37/027 , C03B37/03 , C03B37/12
摘要： PROBLEM TO BE SOLVED: To optimize condition between drawing speed and twisting condition in a method of drawing an optical fiber while continuously twisting a coated optical fiber. SOLUTION: A 1st guiding roller 4 and a 2nd guiding roller 5 which regulate running positions of the coated optical fiber 1 are provided while keeping an interval to each other in a running direction Z of the coated optical fiber 1, and between the guide rollers are provided a 1st roller 2, and a 2nd roller 3 which are in contact with the coated optical fiber 1 while turning around the center axes O directing X direction, move reciprocally along X direction reversely to each other, so as to continuously twist the coated optical fiber 1. The coated optical fiber is depressed by the 2nd reciprocating roller 3 by an amount of depression d2 which is >=0.1% to =4% to =300 m/min.

8. 发明专利

JPH06115972A METHOD FOR DRAWING WIRE OF OPTICAL FIBER 失效
公开(公告)号：JPH06115972A
公开(公告)日：1994-04-26
申请号：JP26887392
申请日：1992-10-07
申请人： FURUKAWA ELECTRIC CO LTD
发明人： KOMATSU WATARU , MAEDA KEIGO
IPC分类号： C03C13/04
摘要： PURPOSE:To stabilize the gas flow and obtain optical fiber with hardly any warpage by making the sealing gas flow in the direction to draw a wire of optical fiber and regulating the flow velocity at the outlet within a specific range. CONSTITUTION:An optical fiber preform 1 is placed in the interior of a wire drawing furnace 5 having a structure equipped with a heater 3 on the outside of a furnace core tube 4, then heated with the heater 3, thereby melted and drawn into a wire. Thereby, the objective optical fiber 2 is obtained. In the process, the velocity of a sealing gas flowing in the furnace core tube 4 is measured with a current meter 7 installed in the interior of an outlet part 6 of the wire drawing furnace. The resultant information is then received with a mass flow controller 8 to control the flow rate of the sealing gas (e.g. Ar gas) and the pore diameter (e.g. 8-14mmphi) at the outlet part 6 of the wire drawing furnace is changed to control the flow velocity thereof so as to provide 1.4-5.0m/sec. Thereby, a wire of the optical fiber is drawn and formed into a tape core wire to measure the connection loss. The extent of warpage is 0.67-1.75mm and the connection loss of the tape core wire is 0.05-0.11dB/km. Thereby, the objective optical fiber with hardly any warpage is obtained.

9. 发明专利

JPH05310446A 失效
公开(公告)号：JPH05310446A
公开(公告)日：1993-11-22
申请号：JP11464792
申请日：1992-05-07
申请人： FURUKAWA ELECTRIC CO LTD
发明人： KOMATSU WATARU , WAKITA TORU
IPC分类号： C03C25/10 , G02B6/44 , C03C25/02
摘要： PURPOSE:To provide a method for producing a core fiber of an optical fiber capable of preventing the waste of a resin from stacking on the end face at outlet side of dice of a cross head. CONSTITUTION:Gas seal boxes 13a and 13b are provided at two stages so as to wholly cover the end face 4a at outlet side of dice of a cross head 2. An inert gas is fed from gas feed valves 14a and 14b in gas seal boxes 13a and 13b. An inert gas is fed from gas feed valves 14a and 14b in gas seal boxes 13a and 13b. In this state, a raw fiber 1 of an optical fiber is passed through a nipple 3 of the cross head 2 and a thermoplastic resin 6 fed from a flow path 5 of the resin between the nipple 3 and the dice 4 is applied to the raw fiber 1 of the optical fiber to provide the objective core fiber 7 of the optical fiber. At this time, dice outlet side of the cross head 2 is pressurized with the inert gas in the gas seal box 13a. Thereby, the waste of the resin is prevented from stacking on the end face at the outlet of dice of cross head.

10. 发明专利

JPH04310532A DRAWING OF OPTICAL FIBER 失效
公开(公告)号：JPH04310532A
公开(公告)日：1992-11-02
申请号：JP7487791
申请日：1991-04-08
申请人： FURUKAWA ELECTRIC CO LTD
发明人： KOMATSU WATARU
IPC分类号： C03B37/027 , C03B37/029 , G02B6/00
摘要： PURPOSE:To continuously produce an optical fiber having high strength in high stability while preventing the lowering of the optical fiber strength. CONSTITUTION:An optical fiber preform 7 in a furnace core tube 3 is heated and melted by a heater 2 placed at the outer circumference of a furnace core tube 3 in a furnace 1 and an optical fiber 8 is drawn from the molten part of the optical fiber preform 7. The furnace core tube 3 has a cooling chamber 9 under the heater 2. The drawing of the optical fiber 8 is carried out while cooling the cooling chamber 9 and forcedly exhausting gas from the cooling chamber 9.

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