GB1569905A - Cables - Google Patents

Cables Download PDF

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Publication number
GB1569905A
GB1569905A GB4162477A GB4162477A GB1569905A GB 1569905 A GB1569905 A GB 1569905A GB 4162477 A GB4162477 A GB 4162477A GB 4162477 A GB4162477 A GB 4162477A GB 1569905 A GB1569905 A GB 1569905A
Authority
GB
United Kingdom
Prior art keywords
fibre
cable
optical fibre
sheath
plastics
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4162477A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB4162477A priority Critical patent/GB1569905A/en
Priority to AU40370/78A priority patent/AU4037078A/en
Publication of GB1569905A publication Critical patent/GB1569905A/en
Expired legal-status Critical Current

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
    • G02B6/443—Protective covering
    • G02B6/4432—Protective covering with fibre reinforcements
    • 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
    • G02B6/4402—Optical cables with one single optical waveguide

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Description

(54) CABLES (71) We STANDARD TELEPHONES AND CABLES LIMITED a British Company of 190 Strand, London W.C.2. England. do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to optical fibre cables.
According to the present invention there is provided a sheathed optical fibre containing but a single fibre extending the length thereof, which fibre is an optical fibre, wherein the cable has an outer sheath made of a thermo-plastics matrix material loaded with carbon fibre.
There follows a description of a preferred embodiment of the invention. The description refers to the accompanying drawing depicting schematically a cross section through the cable.
Referring to the accompanying drawing, a glass optical fibre 1, which may be made of silica having a doped silica central core of higher refractive index to provide waveguiding properties, is provided with a primary plastics coating 2. This primary coating is provided on-line with drawing the fibre in order to minimise the time that the surface of the freshly drawn fibre is exposed to atmospheric attack. A typical fibre 1 is 0.1 mm in diameter with a 30 Can diameter core region. The primary coating 2 is typically a two-part room temperature vulcanising silicone resin 0.05 mm thick. This primary coating is then covered with a secondary plastics coating 3 typically provided by extrusion of for instance a layer of polypropylene to bring the overal diameter up to 1.0 mm.
Suitable alternatives to polypropylene include polycarbonate, polyurethane, polyethylene, thermo-plastic rubber, and polyamide.
The optical fibre 1 complete with its primary and secondary plastics coatings 2 and 3 is then made into a cable by the provision of a cable sheath 4 by extrusion. In this particular instance the cable sheath, which has an external diameter of 2.0 mm, is made of 40% carbon-fibre-loaded polyamide sold under the designation THERM OCOMP (Registered Trade Mark) R.C.
1008 by James Furguson & Sons Ltd under licence from LNP Corporation USA. A typical cable constructed in this manner may have a breaking stress in excess of 50 Kg.
The preferred matrix material of the sheath is a polyamide because such materials have been shown to be capable of forming relatively strong bonds with the fibre dispersed therethrough. Other materials such as polysulphone thermoplastic polyesters and polycarbonate could be used in its place, provided that adequate bonding can be achieved with the fibre dispersed therethrough.
WHAT WE CLAIM IS: 1. A sheathed optical fibre cable containing but a single fibre extending the length thereof, which fibre is an optical fibre, wherein the cable has an outer sheath made of a thermo-plastics matrix material loaded with carbon fibre.
2. A cable as claimed in claim 1 wherein the outer sheath contains 40% carbon fibre.
3. A cable as claimed in claim 1 or 2 wherein the matrix material of the fibre loaded sheath is a polyamide material.
4. A cable substantially as hereinbefore described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (4)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    (54) CABLES (71) We STANDARD TELEPHONES AND CABLES LIMITED a British Company of 190 Strand, London W.C.2. England. do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to optical fibre cables.
    According to the present invention there is provided a sheathed optical fibre containing but a single fibre extending the length thereof, which fibre is an optical fibre, wherein the cable has an outer sheath made of a thermo-plastics matrix material loaded with carbon fibre.
    There follows a description of a preferred embodiment of the invention. The description refers to the accompanying drawing depicting schematically a cross section through the cable.
    Referring to the accompanying drawing, a glass optical fibre 1, which may be made of silica having a doped silica central core of higher refractive index to provide waveguiding properties, is provided with a primary plastics coating 2. This primary coating is provided on-line with drawing the fibre in order to minimise the time that the surface of the freshly drawn fibre is exposed to atmospheric attack. A typical fibre 1 is 0.1 mm in diameter with a 30 Can diameter core region. The primary coating 2 is typically a two-part room temperature vulcanising silicone resin 0.05 mm thick. This primary coating is then covered with a secondary plastics coating 3 typically provided by extrusion of for instance a layer of polypropylene to bring the overal diameter up to 1.0 mm.
    Suitable alternatives to polypropylene include polycarbonate, polyurethane, polyethylene, thermo-plastic rubber, and polyamide.
    The optical fibre 1 complete with its primary and secondary plastics coatings 2 and 3 is then made into a cable by the provision of a cable sheath 4 by extrusion. In this particular instance the cable sheath, which has an external diameter of 2.0 mm, is made of 40% carbon-fibre-loaded polyamide sold under the designation THERM OCOMP (Registered Trade Mark) R.C.
    1008 by James Furguson & Sons Ltd under licence from LNP Corporation USA. A typical cable constructed in this manner may have a breaking stress in excess of 50 Kg.
    The preferred matrix material of the sheath is a polyamide because such materials have been shown to be capable of forming relatively strong bonds with the fibre dispersed therethrough. Other materials such as polysulphone thermoplastic polyesters and polycarbonate could be used in its place, provided that adequate bonding can be achieved with the fibre dispersed therethrough.
    WHAT WE CLAIM IS: 1. A sheathed optical fibre cable containing but a single fibre extending the length thereof, which fibre is an optical fibre, wherein the cable has an outer sheath made of a thermo-plastics matrix material loaded with carbon fibre.
  2. 2. A cable as claimed in claim 1 wherein the outer sheath contains 40% carbon fibre.
  3. 3. A cable as claimed in claim 1 or 2 wherein the matrix material of the fibre loaded sheath is a polyamide material.
  4. 4. A cable substantially as hereinbefore described with reference to the accompanying drawing.
GB4162477A 1977-10-06 1977-10-06 Cables Expired GB1569905A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4162477A GB1569905A (en) 1977-10-06 1977-10-06 Cables
AU40370/78A AU4037078A (en) 1977-10-06 1978-10-03 Optical fibre cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4162477A GB1569905A (en) 1977-10-06 1977-10-06 Cables

Publications (1)

Publication Number Publication Date
GB1569905A true GB1569905A (en) 1980-06-25

Family

ID=10420557

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4162477A Expired GB1569905A (en) 1977-10-06 1977-10-06 Cables

Country Status (2)

Country Link
AU (1) AU4037078A (en)
GB (1) GB1569905A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2139779A (en) * 1983-05-10 1984-11-14 Standard Telephones Cables Ltd Optical fibre cables
GB2153548A (en) * 1984-01-27 1985-08-21 Pirelli Cavi Spa Improvements in or relating to joining optical fibres
US4720368A (en) * 1983-06-28 1988-01-19 Ube-Nitto Kasei Co., Ltd. Method for forming a rod-like molding
US4781434A (en) * 1986-07-24 1988-11-01 Ube-Nitto Kasei Co., Ltd. Spacer of optical fiber cable and method for forming the same
US4814133A (en) * 1986-07-24 1989-03-21 Ube-Nitto Kasei Co., Ltd. Method of forming the spacer of an optical fiber cable
US4976906A (en) * 1984-01-24 1990-12-11 Ube-Nitto Kasei Co., Ltd. Method and apparatus for shaping a continuous rod-like molding
GB2240189A (en) * 1990-01-17 1991-07-24 Telephone Cables Ltd Optical cables

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2139779A (en) * 1983-05-10 1984-11-14 Standard Telephones Cables Ltd Optical fibre cables
US4720368A (en) * 1983-06-28 1988-01-19 Ube-Nitto Kasei Co., Ltd. Method for forming a rod-like molding
US4976906A (en) * 1984-01-24 1990-12-11 Ube-Nitto Kasei Co., Ltd. Method and apparatus for shaping a continuous rod-like molding
GB2153548A (en) * 1984-01-27 1985-08-21 Pirelli Cavi Spa Improvements in or relating to joining optical fibres
US4781434A (en) * 1986-07-24 1988-11-01 Ube-Nitto Kasei Co., Ltd. Spacer of optical fiber cable and method for forming the same
US4814133A (en) * 1986-07-24 1989-03-21 Ube-Nitto Kasei Co., Ltd. Method of forming the spacer of an optical fiber cable
GB2240189A (en) * 1990-01-17 1991-07-24 Telephone Cables Ltd Optical cables

Also Published As

Publication number Publication date
AU4037078A (en) 1980-04-17

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee