GB1328612A - Optical fibre manufacture - Google Patents

Optical fibre manufacture

Info

Publication number
GB1328612A
GB1328612A GB1328612DA GB1328612A GB 1328612 A GB1328612 A GB 1328612A GB 1328612D A GB1328612D A GB 1328612DA GB 1328612 A GB1328612 A GB 1328612A
Authority
GB
United Kingdom
Prior art keywords
glass
tube
crucible
rod
fibre
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
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
Publication of GB1328612A publication Critical patent/GB1328612A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/022—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from molten glass in which the resultant product consists of different sorts of glass or is characterised by shape, e.g. hollow fibres, undulated fibres, fibres presenting a rough surface
    • C03B37/023—Fibres composed of different sorts of glass, e.g. glass optical fibres, made by the double crucible technique
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/08—Bushings, e.g. construction, bushing reinforcement means; Spinnerettes; Nozzles; Nozzle plates
    • C03B37/081—Indirect-melting bushings

Abstract

1328612 Drawing glass fibres STANDARD TELEPHONES & CABLES Ltd 4 Jan 1972 227/72 Heading C1M An optical fibre 10 is produced by forming a glass rod 8 having a core region 7 of higher refractive index by causing molten glass 1 in a crucible 2 to flow under gravity over the rim of a tube 5 and out through its bore, the tube 5 extending vertically through the base of the crucible, the surface of the glass 1 in the crucible being in contact with a substance, such as a tube 4 of a modifying oxide, which reacts with the glass 1 to provide, at least in the region surrounding the rim of the tube 5, a surface layer 6 of higher refractive index than that of the underlying regions of glass 1, which surface layer 6 is entrained down the centre of the tube 5 to form the core 7 of the rod 8 which rod is drawn down to form the fibre 10. The substance may be a vapour, liquid or solid giving either a straight diffusion or an ion exchange. As shown, for a sodium calcium silicate glass 1, the tube 4 is of barium oxide. The crucible 2 is heated by a coil 3 and the level of glass 1 is maintained by the addition of a ring of powdered glass 11 outside the tube 4. Heaters 9 allow the final drawing of the fibre 10 from the rod 8.
GB1328612D 1972-01-04 1972-01-04 Optical fibre manufacture Expired GB1328612A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22772 1972-01-04

Publications (1)

Publication Number Publication Date
GB1328612A true GB1328612A (en) 1973-08-30

Family

ID=9700655

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1328612D Expired GB1328612A (en) 1972-01-04 1972-01-04 Optical fibre manufacture

Country Status (3)

Country Link
AU (1) AU462007B2 (en)
CH (1) CH549810A (en)
GB (1) GB1328612A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378724A1 (en) * 1977-01-27 1978-08-25 Nippon Sheet Glass Co Ltd METHOD AND APPARATUS FOR MANUFACTURING OPTICAL GLASS FIBERS
EP0004183A1 (en) * 1978-03-14 1979-09-19 The Post Office Method and apparatus for drawing optical fibres by means of a double crucible

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378724A1 (en) * 1977-01-27 1978-08-25 Nippon Sheet Glass Co Ltd METHOD AND APPARATUS FOR MANUFACTURING OPTICAL GLASS FIBERS
EP0004183A1 (en) * 1978-03-14 1979-09-19 The Post Office Method and apparatus for drawing optical fibres by means of a double crucible

Also Published As

Publication number Publication date
AU5065073A (en) 1974-07-04
CH549810A (en) 1974-05-31
AU462007B2 (en) 1975-05-23

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee