WO2005091037A1 - 光ファイバコード - Google Patents
光ファイバコード Download PDFInfo
- Publication number
- WO2005091037A1 WO2005091037A1 PCT/JP2005/005087 JP2005005087W WO2005091037A1 WO 2005091037 A1 WO2005091037 A1 WO 2005091037A1 JP 2005005087 W JP2005005087 W JP 2005005087W WO 2005091037 A1 WO2005091037 A1 WO 2005091037A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical fiber
- cover
- fiber cord
- cord according
- adhesive
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
Definitions
- the present invention relates to an optical fiber cord, and more particularly, to an optical fiber cord configured to regulate a bending radius of an optical fiber housed therein so as not to be less than a predetermined value.
- optical fiber cord that houses an optical fiber
- the optical fiber cord must be bent so that it does not bend with a bending radius smaller than its allowable bending radius. It is to regulate. If the optical fiber is bent below the allowable bending radius, the optical fiber core wire may be broken. For this reason, various structures have been proposed and put to practical use, in which the bending radius is regulated so as not to be less than a predetermined value, and the bending of the optical fiber is effectively prevented.
- Japanese Patent Application Laid-Open No. 3-231707 discloses that an optical fiber is inserted into a flexible tube composed of a row of metal blocks connected to each other so as to be displaceable.
- An optical fiber cable is disclosed. By housing the optical fiber in a flexible metal tube, the optical fiber is protected from being bent below the minimum bending radius of the flexible tube.
- the shape is maintained, that is, the optical fiber cord is plastically deformable.
- the optical fiber cord be bent to a shape conforming to the wall and then be maintained in that shape; Returning to the original shape later complicates the work of wiring the optical fiber cord.
- a repulsive force against the shrinkage of the inner peripheral portion acts when bent, and tends to return the bent state to a stable linear state.
- a known optical fiber cable often loses its wiring state after being wired in a field of actual use. Disclosure of the invention
- an object of the present invention is to provide an optical fiber cord having excellent shape retention (that is, plastically deformable) while suppressing the bending radius from being less than a predetermined value. It is in.
- the optical fiber cord includes: an optical fiber; a spring cover covering an outer periphery of the optical fiber; a mesh-shaped blade cover covering an outer periphery of the spring cover; And an outer cover for covering the outer periphery of the cover.
- the spring cover is made of a flat, elastic metal plate formed in a spiral shape.
- the spring covers are maintained in a state in which the adjacent side edges are close to each other while being wound in a spiral shape.
- the blade cover is formed of a net formed by knitting a metal wire.
- the optical fiber cord preferably further includes a reinforcing fiber inserted between the spring cover and the blade cover and provided in a direction along the optical fiber.
- the blade cover and the data cover are bonded by a bonding agent, which is preferably bonded.
- a bonding agent which is preferably bonded.
- a heat-curable adhesive can be used.
- a one-part heat-curable silicone adhesive is used as the adhesive.
- the adhesive may be a room temperature-curable adhesive.
- a one-component RTV rubber or a two-component RTV rubber is used as the adhesive.
- the outer cover is preferably formed from a heat-shrinkable resin.
- the outer diameter of the outer cover is preferably not more than 3. Omm. More preferably, the outer diameter of the outer cover is 2.Omm or more.
- FIG. 1 is a perspective view showing a configuration of an optical fiber cord according to a first embodiment of the present invention.
- FIG. 2A is a partial sectional view showing a position of an undesired optical fiber inside an optical fiber cord
- FIG. 2B is a partial cross-sectional view showing a preferred position of the optical fiber inside the optical fiber cord.
- FIG. 3 is a perspective view showing a configuration of an optical fiber cord according to a second embodiment of the present invention.
- FIG. 4 is a perspective view showing a configuration of an optical fiber cord according to a third embodiment of the present invention.
- FIG. 1 is a perspective view showing a configuration of an optical fiber cord 10 according to a first embodiment of the present invention.
- the optical fiber cord 10 includes an optical fiber 12, a spring cover 14 covering the outer periphery of the optical fiber 12, and a mesh-like blade cover 16 covering the outer periphery of the spring cover 14. And an outer cover 18 that covers the outer periphery of the blade cover 16.
- the optical fiber 12 an optical fiber having a general configuration can be used.
- the optical fiber 12 has a core 12A made of pure silica glass having optical waveguide properties and extending in one direction, and a cladding layer 1 having a refractive index slightly higher than that of the core 12A. 2B and a protective layer 12C that covers the entire outer peripheral surface of the clad layer 12B to protect the core 12A and the clad layer 12B.
- the core 12A and the cladding layer 12B are not limited to being made of pure silica glass.
- the core 12A and the cladding layer 12B are not limited to being made of pure silica glass.
- the optical waveguide property is ensured and the durability (life) is ensured, it is made of transparent plastics. It may be made of multi-component glass.
- the protective layer 12C is formed of a polymer synthetic resin, for example, UV atarilate or pie mouth coat (trade name: Lucent 'Specialty' Fiber Co., Ltd., Connecticut, USA). .
- the protective layer 12C is made of a synthetic resin having a predetermined mechanical strength, for example, Teflon. Zel (trade name: Lucent's Specialty Fiber Technology, Inc., Connecticut, USA). Note that the protective layer 12C is not an essential component of the optical fiber 12, and the optical fiber 12 can be configured even in a state where it is omitted.
- the spring cover 14 is formed by winding a long flat metal piece 14A having a spring property in a spiral shape around the protective layer 12C of the optical fiber 12 and forming it into a tube shape so that it can be bent together with its flexibility. This makes it possible to have elasticity.
- the side edges adjacent to each other are kept close to each other, and a state where a slight gap is generated is maintained.
- the widths of the gaps 14B, 14C, 14D, 14E, 14F, 14G, 14H, and 1J between the adjacent side edges in FIG. 1 are almost the same when the optical fiber cord 10 is placed in a straight line. is there.
- stainless steel such as SUS304AB, which can be easily bent, is suitable. In addition to iron, aluminum, other steel, etc., may be used.
- the blade cover 16 is for covering the outer periphery of the spring cover 14, and has a structure in which thin metal wires are assembled in a net shape. Suitable materials are high tensile strength and stainless steel such as SUS304.
- the outer cover 18 is excellent in elasticity and covers the outer periphery of the blade cover 16.
- a heat-shrinkable resin such as soft vinyl chloride excellent in waterproofness and oil resistance is used.
- flame-retardant vinyl chloride, heat-resistant vinyl chloride, polyethylene, fluorine resin, polyurethane, silicone rubber and the like can also be used.
- the outer cover 18 and the blade cover 16 are adhered. That is, the blade cover 16 contains an adhesive before the outer cover 18 is covered, and after the outer power bar 18 is covered, the adhesive covers the outer cover 18 and the blade cover 16. Glued.
- the adhesive includes a heating type adhesive and a room temperature curing type adhesive, and any of these adhesives can be used.
- a heat-type adhesive a one-part heat-curable silicone adhesive which cures in a short time by heating is suitable.
- RTV Room Temperature Vulcanizing
- two-component RTV rubber which have low viscosity and excellent workability, and are excellent in heat resistance and cold resistance
- the spring cover 14 spirally wound around the protective layer 12 C of the optical fiber 12 is also formed. Bendable. In this case, the width of the gap between the adjacent side edge of the spring cover 14 changes, and the width G of the gap 14B 14C 14D 14E located at the outer periphery of the bend increases, and the width G of the gap located at the inner periphery of the bend increases. The width of the section 14F 14G 14H 14J becomes narrower.
- Matching the minimum bending radius at which the width of 14H1J becomes zero with the minimum bending radius at which the optical fiber 12 does not break is determined by setting the width of the gap of the spring cover 14 that has been placed in a straight line in advance. This is possible.
- the width of the long flat metal piece 14A of the spring cover 14 is set to w
- the winding radius of the spring cover 14 spirally wound around the protective layer 12C of the optical fiber 12 is set to r
- the spring cover 14 is straightened before being bent.
- the minimum bending radius Rmin is given by the following formula:
- Rmin r- (w / d + 1).
- the spring cover 14 has a longer flat plate width w, and a smaller width d between the side edges of the spring cover 14 and the spring d.
- the winding radius r of the cover 14 can be reduced.
- the diameter of the optical fiber cord 10 that is spirally wound by the spring cover 14 can be easily reduced.
- the optical fiber 12 remains inside the optical fiber cord 10 even when the optical fiber cord 10 is bent. It is preferably located at the heart. As shown in FIG. 2A, if the optical fiber 12 is displaced from the center of the optical fiber cord 10 when the optical fiber cord 10 is bent, the optical fiber 12 bends inside the optical fiber cord 10 and the optical fiber 12 is bent. The bending radius force of the fiber 12 may be larger than the bending radius of the optical fiber code 10. This is not suitable for protecting the optical fiber 12. On the other hand, as shown in FIG. 2B, even when the optical fiber cord 10 is bent, if the optical fiber 12 is located at the center of the optical fiber cord 10, the bending radius of the optical fiber 12 becomes: The bending radius of the optical fiber cord 10 is kept the same.
- the blade cover 16 formed by assembling a thin metal wire in a mesh shape covers the outer periphery of the spring cover 14, gaps 14B, 14C, and 14D located on the outer periphery of the bend of the spring cover 14 are provided.
- the mesh-shaped thin metal wire shrinks in the width direction and extends in the vertical direction, and in the gaps 14F, 14G, 14H, and 14J, the mesh-shaped metal wire in the width direction Extends and contracts in the vertical direction.
- Such expansion and contraction of the blade cover 16 makes it possible to realize the minimum bending radius of the spring cover 14.
- the outer cover 18 is adhered to the blade cover 16. For this reason, it is possible to prevent the outer cover 18 from pulling the optical fiber 12 too much to damage the optical fiber 12 and to prevent the coating around the neck of the optical connector connected to the end of the optical fiber cord. Come out.
- the minimum bending radius of the spring cover 14 is such that the width of the gaps 14F, 14G, 14H, and 14J at the inner peripheral portion of the bending of the spring cover 14 is zero, and the adjacent side edges are in contact with each other. Is realized. Furthermore, the blade cover 16 is constructed by assembling a thin metal wire in a net shape, and the outer cover 18 is made of an elastic heat-shrinkable resin, so that even if the optical fiber cord 10 is bent with a minimum radius, it is bent. There is almost no repulsion at the inner circumference of the. More specifically, when an external force is applied to the optical fiber cord 10 in order to bend the optical fiber cord 10 into a desired shape, the position of the wire constituting the blade cover 16 moves minutely.
- the outer cover 18 Since the outer cover 18 has the function of holding the position of the wire, the optical fiber cord 10 remains bent in a desired shape even when the action of the external force is stopped. Therefore, even if the optical fiber cord 10 is wired at a place where the bending radius is small, it is possible to surely achieve the shape maintaining property without breaking the wiring state.
- the spring cover 14 that is spirally wound around the protective layer 12 C of the optical fiber 12 can be easily realized by a usual spiral forming coiling machine, so that an inexpensive optical fiber cord 10 can be manufactured.
- a condition of about 0.15 to about 0.15 is the most suitable condition for production.
- the minimum bending radius Rmin of the optical fiber 12 is about 10 mm, if this value is defined as the minimum bending radius of the spring cover 14, the winding radius r of the spring cover 14 is obtained by substituting the above value into the equation (1). 9 mm to 1.3 mm, and 1 mm to 1.5 mm in consideration of the thickness of the blade cover 16 and the outer cover 18. Therefore, the outer diameter of the optical fiber cord 10 is suitably 2 mm or more and 3 mm or less.
- FIG. 3 is a perspective view showing a configuration of an optical fiber cord 10A according to a second embodiment of the present invention.
- a reinforcing fiber 15 is inserted between the spring cover 14 and the blade cover 16 so that the outside of the spring force bar 14 extends in the same direction as the optical fiber 12.
- the optical fiber cord 10A of the second embodiment has the same configuration as the optical fiber cord 10 of the first embodiment.
- the reinforcing fiber 15 is for increasing the tensile strength of the optical fiber cord 10 by making the outside of the spring cover 14 along the same direction as the optical fiber 12, and is excellent in cut wound resistance, friction resistance and heat resistance.
- Aromatic polyamide fibers are preferably used. A plurality of thin aromatic polyamide fibers are bundled into a single bundle, and a plurality of bundles of reinforcing fibers 15 are incorporated in the optical fiber cord 10 according to purpose.
- FIG. 2 shows a case where the reinforcing fiber 15A, the reinforcing fiber 15B, the reinforcing fiber 15C, and the back side bundle (not shown), that is, a total of four bundles, are provided. It will be obvious to those skilled in the art that the number of bundles of the reinforcing fibers 15 is not limited.
- FIG. 4 is a cross-sectional view illustrating a configuration of an optical fiber cord 10B according to a third embodiment of the present invention.
- the outer cover 18 is adhered to the outer surface of the blade cover 16 .
- the blade force bar 16 is held in the outer cover 18. I have.
- the optical fiber cord 10B of the third embodiment has the same configuration as the optical fiber cord 10 of the first embodiment.
- the structure in which the blade cover 16 is embedded in the aperture cover 18 is effective for improving shape retention. As described above, when an external force is applied to the optical fiber cord 10 to bend the optical fiber cord 10 into a desired shape, the position of the wire constituting the blade cover 16 slightly moves.
- the outer cover 18 has the function of holding the position of the wire.
- the structure in which the blade cover 16 is embedded in the outer cover 18 enhances the action of the outer cover 18 for holding the wires constituting the blade cover 16, thereby effectively improving the shape retention of the optical fiber cord 10.
- the blade cover 16 does not need to be entirely embedded in the outer cover 18. However, as shown in FIG. 4, the fact that the entire blade cover 16 is embedded in the outer cover 18 enhances the action of the outer cover 18 to hold the wires of the blade cover 16 and increases the shape of the optical fiber cord 10. This is suitable for effectively improving the retentivity.
- the blade cover 16 is embedded in the outer cover 18 and the blade cover 16 is adhered to the outer cover 18 with an adhesive is effective for further improving shape retention.
- the blade cover 16 is molded with a resin, whereby the blade cover 16 is embedded in the outer cover 18.
- the adhesive one-part heat-curable silicone adhesive, one-part RTV rubber, and two-part RTV rubber can be suitably used.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Insulated Conductors (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006511263A JPWO2005091037A1 (ja) | 2004-03-22 | 2005-03-22 | 光ファイバコード |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004002091U JP3104147U (ja) | 2004-03-22 | 2004-03-22 | 光ファイバコード |
JP2004-002091U | 2004-03-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005091037A1 true WO2005091037A1 (ja) | 2005-09-29 |
Family
ID=34993850
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/005087 WO2005091037A1 (ja) | 2004-03-22 | 2005-03-22 | 光ファイバコード |
Country Status (2)
Country | Link |
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JP (2) | JP3104147U (ja) |
WO (1) | WO2005091037A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014199295A (ja) * | 2013-03-29 | 2014-10-23 | 古河電気工業株式会社 | 光ファイバケーブル |
WO2014169391A1 (en) * | 2013-04-19 | 2014-10-23 | S.A.T. Investment Inc. | Dental curing light with flexible tip |
KR20160113577A (ko) * | 2013-10-16 | 2016-09-30 | 서티케이블, 인크. | 외장형 가요성 광섬유 조립체 |
EP4202520A1 (en) * | 2021-12-21 | 2023-06-28 | Sterlite Technologies Limited | Optical fiber cable with coil elements |
Citations (10)
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JPS608915U (ja) * | 1983-06-30 | 1985-01-22 | 株式会社 須田製作所 | ケ−ブルグリツプ |
JPS6050815A (ja) * | 1983-08-25 | 1985-03-20 | アルカテル ナ−ムロゼ ベノ−トスハツプ | 耐火・耐油性ケ−ブル |
JPS62218911A (ja) * | 1986-03-20 | 1987-09-26 | Fujitsu Ltd | 光フアイバ心線およびその製造方法 |
JPH05159637A (ja) * | 1991-06-03 | 1993-06-25 | Deutsche Airbus Gmbh | 伝導構成体 |
JPH06273637A (ja) * | 1993-03-22 | 1994-09-30 | Sumitomo Electric Ind Ltd | 光コネクタ用接着剤及び該接着剤を用いた光コネクタ |
JPH08201441A (ja) * | 1995-01-27 | 1996-08-09 | Toshiba Corp | 光による計測装置及びその製造方法 |
JPH11174293A (ja) * | 1997-12-12 | 1999-07-02 | Nippon Steel Weld Prod & Eng Co Ltd | 可とう管入り光ファイバケーブル |
JP2001272556A (ja) * | 2000-03-23 | 2001-10-05 | Hitachi Ltd | 光デバイス |
JP2002372650A (ja) * | 2001-06-15 | 2002-12-26 | Shin Etsu Chem Co Ltd | 光モジュール |
JP2004215494A (ja) * | 2002-12-18 | 2004-07-29 | Sumitomo Electric Ind Ltd | 通信ケーブル及び通信線用保護管 |
-
2004
- 2004-03-22 JP JP2004002091U patent/JP3104147U/ja not_active Expired - Fee Related
-
2005
- 2005-03-22 JP JP2006511263A patent/JPWO2005091037A1/ja not_active Withdrawn
- 2005-03-22 WO PCT/JP2005/005087 patent/WO2005091037A1/ja active Application Filing
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS608915U (ja) * | 1983-06-30 | 1985-01-22 | 株式会社 須田製作所 | ケ−ブルグリツプ |
JPS6050815A (ja) * | 1983-08-25 | 1985-03-20 | アルカテル ナ−ムロゼ ベノ−トスハツプ | 耐火・耐油性ケ−ブル |
JPS62218911A (ja) * | 1986-03-20 | 1987-09-26 | Fujitsu Ltd | 光フアイバ心線およびその製造方法 |
JPH05159637A (ja) * | 1991-06-03 | 1993-06-25 | Deutsche Airbus Gmbh | 伝導構成体 |
JPH06273637A (ja) * | 1993-03-22 | 1994-09-30 | Sumitomo Electric Ind Ltd | 光コネクタ用接着剤及び該接着剤を用いた光コネクタ |
JPH08201441A (ja) * | 1995-01-27 | 1996-08-09 | Toshiba Corp | 光による計測装置及びその製造方法 |
JPH11174293A (ja) * | 1997-12-12 | 1999-07-02 | Nippon Steel Weld Prod & Eng Co Ltd | 可とう管入り光ファイバケーブル |
JP2001272556A (ja) * | 2000-03-23 | 2001-10-05 | Hitachi Ltd | 光デバイス |
JP2002372650A (ja) * | 2001-06-15 | 2002-12-26 | Shin Etsu Chem Co Ltd | 光モジュール |
JP2004215494A (ja) * | 2002-12-18 | 2004-07-29 | Sumitomo Electric Ind Ltd | 通信ケーブル及び通信線用保護管 |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014199295A (ja) * | 2013-03-29 | 2014-10-23 | 古河電気工業株式会社 | 光ファイバケーブル |
WO2014169391A1 (en) * | 2013-04-19 | 2014-10-23 | S.A.T. Investment Inc. | Dental curing light with flexible tip |
US20160067026A1 (en) * | 2013-04-19 | 2016-03-10 | S.A.T. Investment Inc. | Dental curing light with flexible tip |
US10080634B2 (en) | 2013-04-19 | 2018-09-25 | S.A.T. Investment Inc. | Dental curing light with flexible tip |
KR20160113577A (ko) * | 2013-10-16 | 2016-09-30 | 서티케이블, 인크. | 외장형 가요성 광섬유 조립체 |
JP2016537668A (ja) * | 2013-10-16 | 2016-12-01 | サーティケーブル インコーポレイテッド | 装甲された可撓性光ファイバーアセンブリ |
JP2019164369A (ja) * | 2013-10-16 | 2019-09-26 | サーティケーブル インコーポレイテッド | 装甲された可撓性光ファイバーアセンブリ |
KR102469509B1 (ko) * | 2013-10-16 | 2022-11-23 | 서티케이블, 인크. | 외장형 가요성 광섬유 조립체 |
JP7199301B2 (ja) | 2013-10-16 | 2023-01-05 | サーティケーブル インコーポレイテッド | 装甲された可撓性光ファイバーアセンブリ |
EP4202520A1 (en) * | 2021-12-21 | 2023-06-28 | Sterlite Technologies Limited | Optical fiber cable with coil elements |
Also Published As
Publication number | Publication date |
---|---|
JPWO2005091037A1 (ja) | 2008-02-07 |
JP3104147U (ja) | 2004-09-02 |
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