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1. 发明专利

JPS63267905A PRODUCTION OF OPTICAL FIBER CABLE 失效
公开(公告)号：JPS63267905A
公开(公告)日：1988-11-04
申请号：JP10181787
申请日：1987-04-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FUCHIGAMI TATSUYA , KAWASE MASAAKI , NIHEI FUMIHIRO
IPC分类号： G02B6/44
摘要： PURPOSE:To suppress the reduction in the breaking life and the increase in the loss of light to obtain a required excess length with a high precision by arranging an intermediate winder, which has a drum whose diameter is smaller than that of a take-up drum, between a cooling device and a take-up device. CONSTITUTION:An intermediate winder 19 which has a winding drum 20 around which an optical fiber cable 10 should be wound is arranged following a tractive device 12. The outside diameter of this winding drum 20 is smaller than that of a take-up drum 15 (the body diameter of the take-up drum) arranged in a take-up device 14 which takes up the optical fiber cable 10 finally. If the optical fiber cable 10 is wound in one layer when being wound around the winding drum 20 of the intermediate winder 19, a certain excess length rate is secured. Thus, an excess length of the optical fiber is given with a high precision, and the reliability of the breaking life or the like is secured.

2. 发明专利

JPS63265511A HOLLOW PIPE FOR AND METHOD OF PREVENTING CABLE DUCT FREEZING TROUBLE 失效
公开(公告)号：JPS63265511A
公开(公告)日：1988-11-02
申请号：JP9849887
申请日：1987-04-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KAWASE MASAAKI , FUCHIGAMI KENYA , NIHEI FUMIHIRO
IPC分类号： H02G9/06
摘要： PURPOSE:To obtain a method which is effective also for a cable already provided in a duct, by taking a pipe having a nonselfstanding pipe wall into said duct and thereafter by filling a hollow granular material, which absorbs a cubical expansion pressure of water due to its freezing, into said pipe through air pressure. CONSTITUTION:First, an internal pressure is applied by a compressor 10 to a pipe 9 folded and taken into a duct and composed of a high strength member 7 and a flexible member 8 so that said pipe 9 is formed into a hollow pipe shape in said duct. After that, a hollow granular material 11 is sent into the hollow pipe 9 through compressed air. In this manner, when water enters the duct in a cold area, a gap 4 is filled with water, of which volume increases at the time of its freezing. However, a freezing pressure can be reduced by compression and deformation of said hollow granular material 11.

3. 发明专利

JPS62172306A METHOD FOR FORMING FILM ON END SURFACE OF OPTICAL FIBER 失效
公开(公告)号：JPS62172306A
公开(公告)日：1987-07-29
申请号：JP1351286
申请日：1986-01-24
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OYAMADA YAHEI , NIHEI FUMIHIRO
IPC分类号： G02B6/02 , G02B6/24 , G02B6/42
摘要： PURPOSE:To attain partial formation of a film on the end surface of an optical fiber so as to make it appropriate for mass production by forming a regist film on one end surface of the optical fiber and irradiating light upon the other end surface. CONSTITUTION:An optical fiber A1 is cut off at first, and after grinding one end surface of the optical fiber A1 in accordance with necessity, a regist solution is applied to the whole surface of the other end surface to form a regist film 4. Then, light is made incident upon the other end surface and the film 4 formed on a core part is exposed by the light transmitted through the core 1 to form a deteriorated regist film 7. An unexposed film 4 is removed by a developer. Then, a reflecting film material is sticked to the whole end surface of the fiber A1 including residual film part 7 to form a reflecting film 3. Finally, the residual film 7 is removed by a solvent together with the reflecting film 3 formed on the film 7.

4. 发明专利

JPS5827104A HIGH-DENSITY OPTICAL CABLE UNIT 失效
公开(公告)号：JPS5827104A
公开(公告)日：1983-02-17
申请号：JP12503881
申请日：1981-08-10
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： NIHEI FUMIHIRO , HATANO NORIMI , OOTAKE AKIHIRO , SHIRASAKA ARIO , ODA MIKIO , FUSE KENICHI
IPC分类号： H01B7/17 , G02B6/44
摘要： PURPOSE:To decrease the increase in transmission loss and to permit high density containing of optical fibers by contg. plural pieces of optical fiber strands produced by cladding primary coating or buffer coating on optical fibers in a pipe at specific occupying rates without twisting the strands. CONSTITUTION:An optical cable unit1 is of the constitution wherein plural pieces of optical fiber strands 3 are contained in a straight state without twisting in a pipe 2 of plastics or metal. Thin primary coating of a silicone resin or the like is applied on the respective strands 3, and if necessary buffer coating having elasticity is provided on the outside thereof. If the occupying rate E of the optical fiber strands in the pipe 2, expressed by the equation (I), is so set as to attain 10-17%, the optical cable unit having the highest density and less transmission loss is constituted.

5. 发明专利

JPS5827103A OPTICAL FIBER CORE 失效
公开(公告)号：JPS5827103A
公开(公告)日：1983-02-17
申请号：JP12465081
申请日：1981-08-11
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KAWASE MASAAKI , NIHEI FUMIHIRO , KATOU YOSHINORI
IPC分类号： H01B7/17 , C03B37/028 , G02B6/44
摘要： PURPOSE:To tune the strains generated by a temp. change and to prevent the increase in loss by disposing a protective covering material for a glass fiber for optical communication in a pipe, heating the same to one body and drawing said body. CONSTITUTION:Glass fibers 1 are applied with primary cladding 2 to form optical fibers for optical communication. A spacer (or cushion material) 9 is disposed to the fibers and the fibers are put in a glass pipe 7. Inexpensive glass having no relations with signal transmission can be used as a material for the pipe 7. The outer side of the pipe 7 is heated to form one body and the pipe is drawn to produce the fibers 1. A fiber base material 10 is melted in an electric furnace 11, and is passed through a melt well 12 of metal or the like whereby primary cladding is applied. The glass pipe 7 is melt in a crucible B to be clad, and is then clad with plastics. Since the optical fiber core is formed of the pipe consisting essentially of glass as a protecting layer, the protecting layer and the glass fibers behave similarly with a change in temp., thus preventing the increase in loss.

6. 发明专利

JPS5811904A OPTICAL CABLE 失效
公开(公告)号：JPS5811904A
公开(公告)日：1983-01-22
申请号：JP10999281
申请日：1981-07-16
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： ISHIDA YUKINORI , NIHEI FUMIHIRO , OOTAKE AKIHIRO , KOKAYU MIKIO
IPC分类号： H01B7/17 , G02B6/44
摘要： PURPOSE:To prevent optical fiber strands from being broken by coating with the external surface of a pipe in which plural optical fiber strands are loosely stored with plastic fiber having highly expanding force and then the plastic fiber is coated with a plastic covering. CONSTITUTION:An optical cable 10 consists of a plastic pipe 14 in which plural optical fiber strands 12 are loosely stored, plastic fiber 16 having highly expanding force with which the pipe 14 is coated and a plastic covering 18 applied to the fiber 16 so as to form a unit code 20. Each optical fiber strand 12 is composed of an optical fiber consisting of a core and a clad, a protective primary coat formed on the surface of the optical fiber and a buffer layer. Since these optical fibers are loosely stored, the initial slack of the highly expanding plastic fiber 16 can be compensated.

7. 发明专利

JPS57209854A DIE FOR COATING OPTICAL FIBER 失效
公开(公告)号：JPS57209854A
公开(公告)日：1982-12-23
申请号：JP9397881
申请日：1981-06-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUKIDA JIYUUZOU , NIHEI FUMIHIRO
IPC分类号： B05C3/02 , C03C25/12
摘要： PURPOSE:To make the thickness of a plastic coating uniform, and to apply a uniform coating to an optical fiber, by attaching a flexible conical supporting member furnished with a tip having split structure to a die-holding base, and making the tip to follow the deviation of the running optical fiber. CONSTITUTION:A conical supporting member 5 made of a thin flexible plastic film is attached to the die-holding base 8. The tip 6 of the conical supporting member 5 has a split structure, and the upper end is attached closely to the supporting member 5. A coating thickness controlling part 7 is formed as a part of the tip 6, and an optical fiber is passed through said part 7. When the path of the running optical fiber 1 is deviated from the normal path, the tip 6 including the coating thickness controlling part 7 follows freely the optical fiber 1, and the fiber 1 runs always at the center of the coating thickness controlling part 7. By this process, the damage of the optical fiber 1 by the contact with the die can be prevented, and a uniform coating of the plastic material 2 can be applied to the fiber.

8. 发明专利

JPS55134803A MAKING METHOD OF OPTICAL FIBER BRANCHING CIRCUIT 失效
公开(公告)号：JPS55134803A
公开(公告)日：1980-10-21
申请号：JP4203479
申请日：1979-04-09
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KASHIMA GIYUU , NIHEI FUMIHIRO
IPC分类号： G02B6/28
摘要： PURPOSE:To lower cost, make productivity high and make possible branching to three or more fibers by passing the exposed cores in a glass pipe, into which a number of fibers can be passed, and applying tensile force while heating the same from outside to melt. CONSTITUTION:Two optical fibers 4 whose cores are exposed are passed in a pipe 11 made of glass. While the pipe is being heated from the outside, tensile force is applied at the same time in the direction of the arrow 8. The two cores fusion-bond to each other and the pipe 11 fusion-bond as well, thereby providing the taper-form fusion-bonded core. Where this outside diamter becomes equal to the outside diameter of the original cores, it is cut. After this, the other core 10 is joined and is fusion-bonded while these are being again heated. As a result of this, the core diameter increases gradually and is branched to two fibers and therefore the branching circuit of less insertion losses, through which light is difficult to be radiated to the outside, may be made. Since there is no polishing work, the cost is low and even the branching circuit of more than three fibers may be readily manufactured.

9. 发明专利

JPS5311562A WAVEGUIDE CONNECTION STRUCTURE 失效
公开(公告)号：JPS5311562A
公开(公告)日：1978-02-02
申请号：JP8576276
申请日：1976-07-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NIHEI FUMIHIRO , MIYAUCHI MITSURU , TAMURA YASUTSUGU
IPC分类号： H01P1/04
摘要： PURPOSE:To obtain a waveguide connection structure which eliminates a complicated operation to have an electrical confirmation for the connection which uses the waveguide flange or joint.

10. 发明专利

JPS63287918A PRODUCTION OF OPTICAL FIBER CABLE 失效
公开(公告)号：JPS63287918A
公开(公告)日：1988-11-25
申请号：JP12245187
申请日：1987-05-21
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FUCHIGAMI KENYA , KAWASE MASAAKI , NIHEI FUMIHIRO
IPC分类号： C03C25/10 , G02B6/44
摘要： PURPOSE:To impart a surplus length to an optical fiber strand in a cable by applying a back tension to a tensile body to previously impart a required elongation strain to the cable and relieving this strain at the time of taking up. CONSTITUTION:The required back tension Tt is applied on the tensile body 3 by a tensile body letting off device 9 and a pulling device 15. The elongation strain epsilont satisfying the equation epsilont=epsilonm+epsilonf+epsilons is thereby imparted on the optical fiber cable 13 formed of the tensile body 3 and the optical fiber unit 1 imparted with the back tension Tf by an extruder 11. In the equation epsilonm: the surplus length are possessed by the unit 1; epsilonf, epsilons: respectively the elongation strain generated in the unit 1 and the elongation strain in the cable 13 taken out of the extruder 12. The surplus length is imparted to the optical fiber strand in the cable by relieving of this strain epsilont and the cable is taken up on a take-up drum 18. The elongation strain of the optical fiber during the use of the optical cable is suppressed by this surplus length.

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