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1. 发明专利

JPS5654238A DEVICE FOR ELONGATING GLASS ROD AS MATERIAL SUCH AS OPTICAL FIBER MATRIX 失效
公开(公告)号：JPS5654238A
公开(公告)日：1981-05-14
申请号：JP12704379
申请日：1979-10-02
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： EDAHIRO TAKAO , YOMOKARI SHIGEO , SASAGAWA TOSHIKATSU , SANADA KAZUO
IPC分类号： C03B23/06 , C03B37/012 , C03B37/018 , C03B37/027 , C03B37/029 , G02B6/00
摘要： PURPOSE:To provide a high-quality elongated rod having a good outer diameter accuracy by a method wherein a measurement is made on the temperature and outer diameter of a heated glass rod and the glass rod is elongated when its outer diameter is larger than the elongated outer diameter by pulling. CONSTITUTION:The gas burner 7 on the heater truck 6 is ignited, the truck 6 is moved to heat the glass rod 3 held by the chuck 12 of the truck 6 and the chuck 16 of the traction truck 15, the temperature of the rod 3 is measured by the thermometer 11 moving with the truck 6, the signal of measured temperature is output to the comparator 19 installed on the control circuit 17 on the traction device 14 and the signal is compared with the predefined temperature signal. When the temperature of the rod 3 gets equal to the predefined temperatue range, the outer diameter of rod 3 is measured by the instrument 12 and its signal is output to the comparator 18 on the circuit 17 to be compared with the predefined outer diameter signal. If the outer diameter of the rod 3 is larger than that of the elongation, the circuit 17 outputs a control signal to the truck 15 so that the truck runs to elongate the rod 3.

2. 发明专利

JPS5641844A MANUFACTURING APPARATUS FOR OPTICAL FIBER BASE MATERIAL 失效
公开(公告)号：JPS5641844A
公开(公告)日：1981-04-18
申请号：JP11465979
申请日：1979-09-06
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： SENDA KAZUNORI , YOMOKARI SHIGEO , SASAGAWA TOSHIKATSU , SANADA KAZUO
IPC分类号： C03B37/018 , C03B37/014 , G02B6/00
摘要： PURPOSE:To obtain a base material with less fluctuation in the refractive index distribution by setting a burner so that it is turned around the axial line of a rodlike substrate when sootlike glass fine particles are deposited and grown on the substrate tip with the burner. CONSTITUTION:Burner 46 is turned clockwise, and rodlike substrate 11 is rotated counterclockwise and pulled at a predetermined speed. Glass starting materials from hose 32 and fuel gas are fed to burner 46. The glass starting materials, etc. spouted from burner 46 turning along a circle drawn around rotating central shaft (l) of substrate 11 react and synthesize sootlike glass fine particles. The particles deposit on the lower end of substrate 11. By growing this deposit, porous glass preform 55 with uniform diameter and no unevenness for manufacturing an optical fiber is obtd.

3. 发明专利

JPS56109830A MANUFACTURING APPARATUS FOR BASE MATERIAL FOR OPTICAL FIBER 失效
公开(公告)号：JPS56109830A
公开(公告)日：1981-08-31
申请号：JP10324979
申请日：1979-08-14
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： SENDA KAZUNORI , YOMOKARI SHIGEO , SASAGAWA TOSHIKATSU , SANADA KAZUO
IPC分类号： C03B37/018 , C03B37/014 , G02B6/00
摘要： PURPOSE:To obtain a porous glass preform of uniform shape by enabling a burner supporting stand to be moved back and forth in the diametrical direction of a rodlike substrate by means of an eccentric collar in the manufacture of a base material for an optical fiber by a VAD method. CONSTITUTION:Burner 11 is set at the predetermined position, and the distance between burner 11 and the tip of a rodlike substrate is adjusted. by actuating motor 28, eccentric collar 37 inserted in long hole 36 of burner supporting stand 31 is rotated together wih rotating shaft 22, and burner 11 is moved back and forth in the diametrical direction of the substrate together with stand 31. At this time, glass starting materials, etc. are emitted from burner 11 to synthesize sootlike glass fine particles, and the particles are uniformly deposited on the lower part of the substrate to form a porous glass preform of uniform shape. Using this base material an optical fiber with little fluctuation in the refractive index distribution can be manufactured.

4. 发明专利

JPS5626738A MANUFACTURING APPARATUS OF OPTICAL FIBER BASE MATERIAL 失效
公开(公告)号：JPS5626738A
公开(公告)日：1981-03-14
申请号：JP10324879
申请日：1979-08-14
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： SENDA KAZUNORI , YOMOKARI SHIGEO , SASAGAWA TOSHIKATSU , SANADA KAZUO
IPC分类号： C03B37/018 , C03B37/014 , G02B6/00
摘要： PURPOSE:To obtain a porous glass preform having satisfactory characteristics for manufacturing an optical fiber by providing a glass preform manufacturing apparatus with a burner so that the burner is in parallel with the axial line of a rodlike substrate for sticking and depositing sootlike glass fine particles and can be moved circularly. CONSTITUTION:Sootlike glass fine particles are stuck and deposited on the tip of rodlike substrate 6 with burner 7, and they are grown to manufacture porous glass preform 40 as a base material for an optical fiber. At this time, this apparatus is provided with burner 7 so that burner 7 is in parallel with the axial line of substrate 6 and can be moved along a circular locus drawn round the axial line as the center. Porous glass preform 40 thus obtd. has uniform shape, is free from surface unevenness, and shows high reproduciblity. Accordingly, using this preform a high quality optical fiber having a steadier refractive index distribution is obtd.

5. 发明专利

JPS5626737A EXHAUST ADJUSTER FOR OPTICAL FIBER BASE MATERIAL MANUFACTURING APPARATUS 失效
公开(公告)号：JPS5626737A
公开(公告)日：1981-03-14
申请号：JP10324779
申请日：1979-08-14
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： SENDA KAZUNORI , YOMOKARI SHIGEO , SASAGAWA TOSHIKATSU , SANADA KAZUO
IPC分类号： C03B37/018 , C03B37/00 , C03B37/014 , G02B6/00
摘要： PURPOSE:To enhance the efficiency of porous glass preform manufacturing work by attaching an on-off valve to an air pipe communicating with the exhaust pipe of the body of an apparatus for manufacturing a porous glass preform as a base material for an optical fiber and by setting an on-off valve driving device, a pressure change detector, a controller, etc. CONSTITUTION:Air pipe 15 communicating with exhaust pipe 11 of body 10 of an apparatus for manufacturing a porous glass preform as a base material for an optical fiber on the tip of a rodlike substrate with a burner is provided with on-off valve 16 for adjusting the internal pressure of pipe 11, driving device 27 for opening or closing valve 16, detector 17 for detecting a change in the internal pressure of pipe 11 and controller 24 which receives the detection signal of detector 17 and controls device 27. Thus, the internal pressure of pipe 11 is automaticaly held within a preset exhaust pressure range, and a flame blown off from the burner is prevented from flickering, giving a porous glass preform of uniform shape.

6. 发明专利

JPH05105470A DEVICE FOR PRODUCING OPTICAL FIBER PREFORM 失效
公开(公告)号：JPH05105470A
公开(公告)日：1993-04-27
申请号：JP30223491
申请日：1991-10-22
申请人： FUJIKURA LTD
发明人： SASAGAWA TOSHIKATSU , NAKAYAMA KOYO , HARADA KOICHI
IPC分类号： C03B37/018 , C03B37/014 , G02B6/00
摘要： PURPOSE:To drastically shorten the producing time by vertically providing a soot blowing mechanism as a lower system and an upper system. CONSTITUTION:A lower soot blowing mechanism 2 and an upper soot blowing mechanism 3 are provided and moved in the axial direction of a target member 1 to blow and deposit soot. The lower mechanism 2 is formed with the soot blowing mechanisms 5 and 6 provided with a burner 4, the soot blowing mechanisms are moved (forward movement) from one end of the member 1 to the other end (from right end of member 1 in the figure to the left end) to blow soot, and then rapidly returned from the other end to the one end to repeat soot blowing (from left end of the member in the figure to the right end), and the process is repeated. The upper soot blowing mechanism 3 is provided with the soot blowing mechanisms 7 and 8 furnished with a burner 4 and used to deposit soot in the same way as the lower mechanism to produce an optical fiber preform.

7. 发明专利

JPH0219922B2 失效
公开(公告)号：JPH0219922B2
公开(公告)日：1990-05-07
申请号：JP15559580
申请日：1980-11-05
申请人： FUJIKURA LTD
发明人： SHIODA TAKAO , SASAGAWA TOSHIKATSU
IPC分类号： G02B1/02 , C03B37/012 , C03C13/00 , G02B6/00

8. 发明专利

JPS5997547A APPARATUS FOR MANUFACTURING OPTICAL FIBER 失效
公开(公告)号：JPS5997547A
公开(公告)日：1984-06-05
申请号：JP20721482
申请日：1982-11-26
申请人： FUJIKURA LTD
发明人： SASAGAWA TOSHIKATSU , HARADA KOUICHI , NAKAYAMA KOUYOU , KAWABATA MITSURU
IPC分类号： C03B37/03 , C03C25/12 , G02B6/44
摘要： PURPOSE:To save labor and to simplify operation by expanding the interval between coaters at the beginning of the working of the titled apparatus and by accumulating a drawn optical fiber around an accumulator between the coaters. CONSTITUTION:The 1st and the 2nd movable holders 13, 14 are driven along a guide rail 12 by the 1st and the 2nd driving means 15, 16, respectively to move a primary coater 4 upward and a secondary coater 5 downward, thereby expanding the interval between the coaters 4, 5. An accumulator 17 is moved upward by the 3rd driving means 18 and positioned under the coater 4. A furnace 1 for heating a base material is worked to draw an optical fiber 2. The tip of the fiber 2 is introduced into the 1st extruding die 8 and the 1st drying furnace 9 in order, and the primarily coated fiber 2 is accumulated around the accumulator 17. The accumulator 17 is slowly lowered to a position close to the coater 5. The fiber 2 is cut by a worker at a part above the accumulator 17, and the tip of the fiber 2 is introduced into the 2nd extruding die and the 2nd drying furnace 11.

9. 发明专利

JPH0710582A CUTTING METHOD AND DEVICE FOR OPTICAL FIBER PREFORM 失效
公开(公告)号：JPH0710582A
公开(公告)日：1995-01-13
申请号：JP17734693
申请日：1993-06-24
申请人： FUJIKURA LTD
发明人： OTAKE FUMIO , SASAGAWA TOSHIKATSU
IPC分类号： B26D1/14 , C03B33/06 , C03B37/012 , C03B37/014
摘要： PURPOSE:To eliminate the occurrence of cracking and residual stress in an optical fiber preform. CONSTITUTION:This cutting method for the optical fiber preform has a stage for holding and fixing the optical fiber preform 1 to a rotary cutter 5 in such a manner that the respective axial lines are paralleled, a stage for rotationally driving both of the optical fiber preform 1 and the rotary cutter 5 in the same direction or opposite directions at a proper rotating speed and a stage for feeding the optical fiber preform 1 at a proper cutting in speed while rotting the rotary cutter 5.

10. 发明专利

JPH04160028A DEVICE FOR PRODUCING OPTICAL FIBER PREFORM 失效
公开(公告)号：JPH04160028A
公开(公告)日：1992-06-03
申请号：JP28330090
申请日：1990-10-23
申请人： FUJIKURA LTD
发明人： SASAGAWA TOSHIKATSU , NAKAYAMA KOYO , HARADA KOICHI
IPC分类号： G02B6/00 , C03B37/014 , C03B37/018
摘要： PURPOSE:To improve working efficiency by providing >=2 systems of a soot spraying mechanism having a burner and successively and alternately reciprocating the systems. CONSTITUTION:A guide plate 7a inclined at a specified angle of theta to a target member 1 and a horizontal guide plate 15a parallel to the Y direction are fixed on bases 7 and 15 erected on traveling bodies 6 and 14 moving in the axial direction of the member 1 supported by a supporting member 4, and many bodies 8 and 16 furnished with burners 9 and 17 are fixed on the upper surfaces of guide plates 7a and 15a so that their centers are aligned with the center of the member 1. The member 1 is rotated by a motor 5 and a screw shaft 11 by a motor 10, hence the bases 7 and 15 are successively and alternately reciprocated, and soot is deposited on the member 1 from the burners 9 and 17. As the diameter of the member 1 gradually increases, racks 13 and 19 fixed to the upper surfaces of the guide plates 7a and 15a are moved by the pinions rotated by auxiliary driving motors 12 and 18, and the burners 9 and 17 are retreated to the rearmost parts of the many bodies 8 and 16.

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