公开(公告)号：JPS5761962A

公开(公告)日：1982-04-14

申请号：JP13788180

申请日：1980-09-30

Applicant: Fujitsu Ltd

Inventor： OKAMURA KOUJI ,  NAKAMURA OSAMU ,  GOTOU JIYUNJIROU ,  TSUKAMOTO MAKOTO

IPC: G01R31/08 ,  G01D5/353 ,  G01K11/00 ,  G01M11/02 ,  G01T1/06 ,  G02B6/02 ,  H02H5/10

CPC classification number: G01K11/00 ,  G01D5/3537 ,  G01T1/06

Abstract: PURPOSE:to realize the monitoring of the environmental change over a long distance, by using a photoconductor formed by covering the outer circumference of a core with a cladding layer and a environment-sensitive member that senses optically the environmental change, then varies the optical characteristics. CONSTITUTION:A photoconductor 1 formed by covering the outer circumference of a core with a cladding layer is set on a substrate 21 made of quartz, etc. and in a direction where the cut-away face 4 is vertical to the surface of the substrate 21. An environment-sensitive member 22 made of a material which is sensitive to the environmental change such as the temperature, radioactive rays, etc. and has a change of optical characteristics like the wax-type paraffin that changes the light transmittance by the change of temperature is adhered to the face 4. In addition, a reporting means is adhered to the side face of the member 22. In such constitution, the environmental change is monitored over a long distance for a disconnection of the electric power transmission wire, etc.

Abstract translation: 目的：通过使用通过用包覆层覆盖芯的外周形成的感光体和感光环境变化的环境敏感部件来实现对长距离的环境变化的监视，然后改变光学特性 。 构成：在由石英等制成的基板21上并且在切除面4垂直于基板21的表面的方向上设置通过用包覆层覆盖芯的外周而形成的感光体1 由环境变化如温度，放射线等敏感的材料制成的环境敏感部件22，具有如蜡型石蜡那样的光学特性变化，其通过改变光线透射率 温度附着在面部4上。此外，报告单元附着在构件22的侧面上。在这种结构中，对于输电线等的断开，长时间地监视环境变化。

公开(公告)号：JPS5751140A

公开(公告)日：1982-03-25

申请号：JP12543280

申请日：1980-09-09

Applicant: Fujitsu Ltd

Inventor： OKAMURA KOUJI ,  GOTOU JIYUNJIROU ,  TSUKAMOTO MAKOTO ,  NAKAMURA OSAMU

IPC: C03B37/018 ,  G02B6/00

CPC classification number: C03B37/01815 ,  C03B37/01876

Abstract: PURPOSE:To obtain the titled base material for an optical fiber having a core glass layer of uniform thickness in depositing a glass layer on the inner surface of a reactor tube by the modified (internal) CVD method, by heating an introductory end for a raw material gas with an auxiliary heating burner provided separately from a main heating burner for heating the reactor tube. CONSTITUTION:An auxiliary heating burner 12 is provided and fixed at an introductory end 2 for a raw material gas of a reactor tube 5 separately from a main heating burner 11 to be transferred from the introductory end 2 for the raw material forming glass to a gas discharge end 6. The raw material for forming glass is then introduced from the gas introductory end 2 into the reactor tube 5, and only the main heating burner 11 is reciprocated from the gas introductory end 2 to the gas discharge end 6. The heating power of the auxiliary heating burner 12 is weakened on transferring the main heating burner 11 from the gas introductory end 2 to the gas discharge end 6, and the heating power of the auxiliary heating burner 12 is increased on returning the main heating burner 11 from the gas discharge end 6 to the gas introductory end 2 to form a glass layer of uniform thickness on the inner surface of the reactor tube 5.

Abstract translation: 目的：为了获得具有均匀厚度的芯玻璃层的光纤的标题基材，通过改进的（内部）CVD方法在反应器管的内表面上沉积玻璃层，通过加热原料的介绍端 与主加热燃烧器分开设置的辅助加热燃烧器的材料气体用于加热反应管。 构成：辅助加热燃烧器12设置并固定在与主加热燃烧器11分开的反应器管5的原料气体的介绍端2处，以从原料形成玻璃的介绍端2转移到气体 然后将用于形成玻璃的原料从气体导入端2引入反应器管5中，并且只有主加热燃烧器11从气体导入端2往气体排出端6往复运动。加热功率 在将主加热燃烧器11从气体导入端2输送到气体排出端6时辅助加热燃烧器12的加热力减弱，辅助加热燃烧器12的加热功率在从主加热燃烧器11返回时增加 排出端6到气体导入端2，以在反应器管5的内表面上形成均匀厚度的玻璃层。

公开(公告)号：JPS5747736A

公开(公告)日：1982-03-18

申请号：JP12036580

申请日：1980-08-29

Applicant: Fujitsu Ltd

Inventor： GOTOU JIYUNJIROU ,  OKAMURA KOUJI ,  NAKAMURA OSAMU ,  TSUKAMOTO MAKOTO

IPC: C03B37/00 ,  C03B37/018 ,  G02B6/00

CPC classification number: C03B37/01815 ,  C03B37/01846 ,  C03B2207/46

Abstract: PURPOSE:To make the thickness of a deposited glass layer uniform in the longitudinal direction by setting a cooling means for the outer wall of a reaction tube in the vicinity of a burner heating the outer wall of the tube so that the cooling means is moved in the moving direction of the burner in synchronism with the burner. CONSTITUTION:Ar carrying SiCl4 and GeCl4 and gaseous O2 introduced into a reaction tube 1 from the introducing end 2, and a burner 3, a cooling nozzle 12 and an electrically heating furnace 13 are moved from the end 2 to the gas exhausting end 5. Since the outer wall of the tube 1 is cooled with a refrigerant from the nozzle 12, most of oxide soot 14 produced at a high temp. in the vicinity of the burner 3 is stuck to the inner wall of the tube 1 within a small region in the moving direction of the burner 3. The sticking of the residual soot to the inner wall of the tube 1 is avoided since the wall is heated with the furnace 13 adjacent to the nozzle 12. Accordingly, deposition with a trail left in the moving direction of the burner 3 is prevented and a glass layer having a uniform thickness is obtd.

Abstract translation: 目的：通过在加热管外壁的燃烧器附近设置用于反应管外壁的冷却装置，使得沉积玻璃层的厚度在纵向上均匀，从而使冷却装置移动 燃烧器与燃烧器同步的移动方向。 构成：将从引入端2导入反应管1的SiCl 4和GeCl 4和气态O 2携带的Ar和燃烧器3，冷却喷嘴12和电加热炉13从端部2移动到排气端5。 由于管1的外壁由来自喷嘴12的制冷剂冷却，所以在高温下产生的大部分氧化物烟灰14。 在燃烧器3的附近，在燃烧器3的移动方向的小的区域内，将燃烧器3的内壁粘贴在管1的内壁。由于壁是壁，因此避免残留的烟灰粘附到管1的内壁 与喷嘴12相邻的炉13加热。因此，防止沿着燃烧器3的移动方向留下痕迹的沉积，并且可以获得具有均匀厚度的玻璃层。

公开(公告)号：JPS56120526A

公开(公告)日：1981-09-21

申请号：JP1504180

申请日：1980-02-08

Applicant: FUJITSU LTD

Inventor： NAKAMURA OSAMU ,  AKAMATSU TAKESHI ,  GOTOU JIYUNJIROU

IPC: C03B5/225 ,  C03B19/12 ,  C03B37/016 ,  C03B37/023 ,  C03C3/062 ,  C03C3/064 ,  C03C3/16 ,  C03C13/04 ,  G02B6/00

Abstract: PURPOSE:To mass-produce the titled glass in a high yield by adding liq. phosphoric acid to hydrolyzates of halides of positive elements constituting glass to form a phosphoric acid compound and vitrifying the compound by heat melting. CONSTITUTION:GaCl3 and NH4OH are introduced into reactor R to precipitate Ca(OH)3 by hydrolysis. Next, SiCl4, GeCl4, etc. are introduced into reactor R to precipitate SiO2, GeO2, etc. by hydrolysis, and H3PO4 is introduced into reactor R, where it is reacted with the precipitates to form phosphate glass contg. Si, Ge and Ga. This glass is precipitated in glass melting crucible 2 under reactor R. Crucible 2 is then separated, and the glass is freed of water by heating and further heated in a furnace at about 1,400 deg.C. The resulting transparent glass is dehydrated and drawn out of the bottom of crucible 2 to obtain a glass fiber for an optical fiber.

公开(公告)号：JPS5673642A

公开(公告)日：1981-06-18

申请号：JP15091879

申请日：1979-11-20

Applicant: FUJITSU LTD

Inventor： NISHIJIMA YOSHINDO ,  KAWABATA YOSHIO ,  NAKAMURA OSAMU

IPC: C03B37/023 ,  G02B6/00

Abstract: PURPOSE:To manufacture an optical fiber while easily controlling the core to outside diameter ratio by introducing core forming material glass and clad forming material glass into a multiple crucible, melting them, and carrying out spinning while pressurizing the higher viscosity side glass. CONSTITUTION:Core forming glass rod 1 is put into melting crucible 2, clad forming glass rod 3 into melting crucible 4, and rods 1, 3 are melted by heating with heating furnace 5A. Core glass 9 is fed into spinning crucible 6 through U-shaped conduit 7. Clad glass 10 is introduced into the 2nd chamber 13 through central conduit 14 of partition plate 11 of the 1st chamber 12 of crucible 4, and it is fed into crucible 6 through U-shaped conduit 7 while being pressurized by oxygen gas supplied from gas introducing pipe 15. Glass 9 and glass 10 are then heated with heating furnace 5B and spun to obtain an optical fiber. This fiber is irradiated with laser beams, and on the basis of the pattern of the reflected beams the core to outside diameter ratio is detected to control the pressure of oxygen gas supplied to chamber 13. Thus, the core to outside diameter ratio is controlled.

公开(公告)号：JPS569239A

公开(公告)日：1981-01-30

申请号：JP8574679

申请日：1979-07-05

Applicant: FUJITSU LTD

Inventor： NAKAMURA OSAMU ,  NISHIJIMA YOSHINDO ,  KAWABATA YOSHIO

IPC: C03B37/014 ,  C03C3/16 ,  G02B6/00

Abstract: PURPOSE:To obtain glass for an optical transmission line whose transmission loss is less than that of a conventional method, by introducing SOCl2 supporting carrier gas to perform agitation, while vitrifying phosphoric acid type glass forming oxide. CONSTITUTION:When a starting material composite for an optical transmission line manufactured by reaction with phosphoric acid is heated melted and vitrified in quartz crucible 1 in quartz furnace core tube 6 provided with heating furnace 7, at least one kind of carrier gas such as O2, He, N2 or Ar supporting SOCl2 in evaporator 4 is introduced into crucible 1 through pipe 3 to perform agitation. Thus, atomic Cl formed by the reaction of SOCl2 and O2 reacts with OH group in the molten material to efficiently remove them, and glass for an optical transmission line whose optical transmission loss is less than that of a conventional method is obtd.

公开(公告)号：JPS5595643A

公开(公告)日：1980-07-21

申请号：JP13063479

申请日：1979-10-08

Applicant: FUJITSU LTD

Inventor： INOUE KOUZOU ,  AKAMATSU TAKESHI ,  NAKAMURA OSAMU

IPC: C03B8/04 ,  C03B19/14 ,  C03C3/16 ,  C03C3/253 ,  G02B6/00

Abstract: PURPOSE:To obtain high purity phosphate glass with superior optical properties and high water resistance for a light transmission line by vapor-phase-reacting a III group element cpd. such as a Ga, B or Al cpd. with a P cpd. and melting the reaction product together with a Ge or Si cpd. CONSTITUTION:Liquid POCl3 in container 1 and liquid GaCl3 in container 2 are taken out of pipes 5, 6 with bubbling gases 3, 4 such as Ar and mixed. O2 gas 7 is added to the mixed gas and introduced into torch 9. By a high temp. of oxyhydrogen flame 12 formed by igniting O2 gas 10 and H2 gas 11 introduced into torch 9, the POCl3 and GaCl3 are vapor-phase-reacted to deposite GaPO4 soot 13 on the inside of crucible 14. This GaPO4 is then melted together with a Ge or Si cpd. and vitrified.

公开(公告)号：JPS5587918A

公开(公告)日：1980-07-03

申请号：JP16250278

申请日：1978-12-26

Applicant: FUJITSU LTD

Inventor： NAKAMURA OSAMU ,  NISHIJIMA YOSHINDO

IPC: G01F23/14 ,  C03B37/023 ,  G02B6/00

Abstract: PURPOSE:To enable to detect the liquid level of fused glass and to continuously spin the optical fiber wherein the outer diameter ratio of the core glass to the coating glass is constant by measuring a change of the liquid level in the U-shaped pipe mounted on the outside of the heating furnace. CONSTITUTION:Fixed quantities of the glass materials 9, 10 are fused in the core and coating glass crucibles 2, 3 of the spinning crucible 1. Also the fused glass 11, 12 is communicated to the U-shaped pipe 5 with the communicating vessel 6, the liquid level in the U-shaped pipe is set to the same level as that of the fused glass in the crucible by the leak valve 7. When the spinning rate of the optical fiber 8 and the feeding rate of glass materials 9, 10 are unbalanced, air pressure in the communicating vessel 6 changes, the level difference DELTAh is develops on the liquid level in the U-shaped pipe. Since the difference DELTAh is proportional to a change of the liquid level of fused glass, change of the liquid level in the U-shaped pipe mounted on the outside of the furnace is detected and the feeding rate of the glass material is controlled to keep the liquid level constant at all times, and the optical fiber wherein the outer diameter ratio of the core glass to the coating glass is fixed can be spinned.

公开(公告)号：JPS5515965A

公开(公告)日：1980-02-04

申请号：JP8864778

申请日：1978-07-19

Applicant: FUJITSU LTD

Inventor： NAKAMURA OSAMU ,  NISHIJIMA YOSHINDO

IPC: C03B37/018 ,  C03B37/023 ,  G02B6/00

Abstract: PURPOSE:To stably produce high quality optical fiber using high yield glass by sticking high viscosity glass formed by plasma oxidation of raw gases to the inner walls of heat resistant reactors; lowering the viscosity by heating; and letting the resulting low viscosity glass flow out of the reactor bottoms. CONSTITUTION:Inner reactor 1 and outer reactor 2 are evacuated to, e.g. 10 Torr from lower funnel-shaped outflow holes 1a,2a. POCl3, GaCl3 and GeCl4 stored in separate vapor phase generators are supported on inert gas such as Ar, mixed with O2, and fed 4 into reactor 1. SiCl4, BBr3, POCl3 and GaCl3 are fed 5 into reactor 2 together with O2 gas by the entirely same method. Next microwave oscillation coils 3 are actuated to stick P2O5-Ga2O3-SiO2-B2O3 four component glass layers 7,8 of high viscosity to the inner walls of reactors 1,2 by plasma oxidation. The whole reactors are shifted into an electric furnace for spinning, and by controlling heating furnace 6 the viscosity is lowered. The resulting low viscosity glass is spun to produce optical fiber.

公开(公告)号：JPS54142321A

公开(公告)日：1979-11-06

申请号：JP5141178

申请日：1978-04-28

Applicant: FUJITSU LTD

Inventor： INOUE KOUZOU ,  AKAMATSU TAKESHI ,  NAKAMURA OSAMU ,  GOTOU JIYUNJIROU

IPC: C03B37/023 ,  C03B37/027 ,  G02B6/00

Abstract: PURPOSE:To prevent the crystallization and devitrification of glass, by maintaining the phosphate glass raw material above the liquid-phase temperature, and by cooling the glass to the spinning temperature after disappearance of crystal nuclei. CONSTITUTION:Phosphate glass raw material is heated to a temperature T1, e.g. 1,300 deg.C, above the liquid-phase temperature, and maintained at T1 for a given time to make crystal nuclei formed below T1 disappear. The glass is then cooled to the spinning temperature T2, e.g. 950 deg.C, and spun into the objective glass fiber.