WO2003102641A1 - Procede de production de fibre optique en plastique - Google Patents

Procede de production de fibre optique en plastique Download PDF

Info

Publication number
WO2003102641A1
WO2003102641A1 PCT/JP2003/006764 JP0306764W WO03102641A1 WO 2003102641 A1 WO2003102641 A1 WO 2003102641A1 JP 0306764 W JP0306764 W JP 0306764W WO 03102641 A1 WO03102641 A1 WO 03102641A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
heating furnace
base material
furnace
diameter
Prior art date
Application number
PCT/JP2003/006764
Other languages
English (en)
Japanese (ja)
Inventor
Tsuyoshi Onishi
Kenichi Ebata
Chikafumi Tanaka
Koji Koganezawa
Original Assignee
Asahi Glass Company, Limited
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 Asahi Glass Company, Limited filed Critical Asahi Glass Company, Limited
Priority to AU2003241912A priority Critical patent/AU2003241912A1/en
Priority to JP2004509466A priority patent/JPWO2003102641A1/ja
Publication of WO2003102641A1 publication Critical patent/WO2003102641A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00663—Production of light guides
    • B29D11/00721—Production of light guides involving preforms for the manufacture of light guides
    • 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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02033—Core or cladding made from organic material, e.g. polymeric material

Definitions

  • the present invention relates to a method for manufacturing a plastic optical fiber, and particularly to a method for manufacturing a plastic optical fiber having a multilayer structure, the method for manufacturing an optical fiber having excellent adhesion between layers, low transmission loss, and small variation in wire diameter.
  • a manufacturing method related to a manufacturing method. Background art
  • plastic optical fibers have been developed as optical fibers for communications.
  • a refractive index distribution type optical fiber is being put to practical use.
  • the graded index optical fiber made of plastic has a large diameter and is easy to connect, has excellent flexibility, and is suitable for high-bandwidth and high-speed communication. It is suitable as a short-distance communication medium, and its market is expanding.
  • a plastic refractive index distribution type optical fiber using a fluoropolymer has a low transmission loss over a wide wavelength range.
  • the optical fiber disclosed in Japanese Patent Application Laid-Open No. Hei 8-55848 has a low transmission loss of 100 dBBZ km or less over a wide wavelength range of 500 nm to 130 nm. It has high performance and is excellent in that various light sources that have already been put to practical use can be used.
  • Japanese Patent Application Laid-Open No. H11-109144 discloses that a fluorine-containing polymer is used in order to improve the tensile strength of the optical fiber ⁇ the abrasion resistance.
  • a technique for producing an optical fiber by spinning an optical fiber preform having an inner layer and an outer layer made of a resin having a high tensile modulus such as an acrylic resin is disclosed.
  • Ma Japanese Patent Application Laid-Open No. 2000-284141 also discloses a method for producing an optical fiber having a multilayer structure, in which a resin having a specific melt viscosity range is used, and a gap between adjacent layers is formed. A method of spinning while reducing the pressure is disclosed.
  • the wire diameter is the outer diameter of the optical fiber.
  • the variation in the wire diameter is a variation in the wire diameter in the longitudinal direction of the optical fiber, and is represented by a variation range with respect to the average wire diameter.
  • a method of suppressing the fluctuation of the wire diameter a method of controlling the surface temperature by flowing an inert gas over the surface of the preform is disclosed in Japanese Patent Application Laid-Open No. Hei 8-94460.
  • No. 45 discloses methods of providing low-temperature maintaining means at the lower part of the heating furnace, but none of them has a sufficient effect of suppressing the fluctuation of the wire diameter.
  • the spinning proceeds while the outer resin pulls the inner resin. Therefore, if the adhesiveness between the outer layer and the inner layer is not sufficient, it is considered that a small slip occurs at the interface, and that the influence of the influence is likely to make the production of the optical fiber unstable. Disclosure of the invention In the present invention, in order to solve the above-described problems and improve the adhesiveness between the inner layer and the outer layer of the resin, the respective SP values of the resin used and the heating conditions when the optical fiber preform is spun. I paid attention.
  • the SP value is a value obtained by the following formula (1) from the molar attractive constant ⁇ F (Molar Attraction ion Constant) by S mal 1, the molecular weight M, and the density.
  • the present invention is a method for producing a plastic optical fiber for producing a plastic optical fiber having a multilayer structure having an inner layer and at least one outer layer by spinning an optical fiber preform.
  • the selected resin A step of preparing a cylindrical molded body that can be arranged adjacent to the outside of the cylindrical molded body in the step (A) in the step (A); (C): the columnar molded body of the step (A) is placed in the innermost part; )) A process of preparing an optical fiber preform by placing one or more cylindrical molded bodies coaxially with an air gap outside, and (D): temperature control independently of each other A step of preparing a possible first heating furnace and a second heating furnace, (E): a step of reducing the gap of the base material by 1 to 1.4 kPa with respect to the atmospheric pressure, ( F): Assuming that the glass transition point of the fluoropolymer a1 is T al , the optical fiber preform is changed from T al to (T al + 40) using the first heating furnace.
  • a heating furnace having a center wavelength of emitted light of 0.5 to 1.5 im as the first heating furnace or the second heating furnace. According to this embodiment, stable production is possible even when a large-diameter base material is used.
  • the furnace body has a cylindrical shape, a seal portion is provided in one of the furnace openings, and at least two or more circular tubes are provided in the other of the furnace openings, and the seal portion has elasticity.
  • the seal portion has a circular opening centered on a central axis of the furnace body, and a plurality of small openings provided around the circular opening; and the two or more circular tubes Have the same central axis as the central axis of the furnace body, the circular tubes are arranged so as to have a gap, and one of the two or more circular tubes having the smallest inner diameter. It is preferable to use a heating furnace in which the opening is disposed inside the furnace body.
  • the furnace body is installed so that the above-mentioned seal portion is located at the top, and a base material having a diameter larger than the diameter of the circular opening of the seal portion is used.
  • the preform is heated in a furnace, and the optical fiber is taken out through a circular tube having a minimum inner diameter among the two or more circular tubes.
  • FIG. 1 is a cross-sectional view of an example of a second heating furnace.
  • FIG. 2 A top view of an example of the seal portion.
  • FIG. 3 is a schematic cross-sectional view illustrating a manufacturing method of the present invention.
  • 31 base material
  • 31a inner layer
  • 32b outer layer
  • optical fiber means “optical fiber made of plastic”.
  • the longer the optical fiber with low transmission loss the longer the signal transmission becomes possible, but usually the long-distance transmission is performed via a plurality of connections. Therefore, it is necessary to suppress the connection loss.
  • wire diameter fluctuation has a significant effect on connection loss. Therefore, the method for manufacturing an optical fiber disclosed in the present invention, in which the fluctuation of the wire diameter is extremely suppressed, is suitable for manufacturing an optical fiber made of a transparent fluororesin having a low transmission loss, and among them, the refractive index distribution It is particularly suitable for the production of optical fibers made of transparent fluororesin.
  • a plastic optical fiber is manufactured by heating and spinning an optical fiber preform (hereinafter, also simply referred to as a preform).
  • the optical fiber according to the present invention is made of resin and has a multilayer structure having an inner layer and at least one outer layer. That is, the base material also has a similar multilayer structure.
  • the inner layer is substantially a region through which light rays pass, and the outer layer plays a role of mainly reinforcing and protecting.
  • the polymer film (the thickness to be measured is preferably about 0.2 mm) is formed and the infrared absorption spectrum is measured. Is substantially not observed.
  • Non-crystalline is defined as a diffraction pattern with 20 (unit: degree) on the horizontal axis and intensity (cps) on the vertical axis when X-ray diffraction (XRD) of a polymer or a polymer composition is measured. , Half width is 2 degrees or less Is substantially not observed.
  • the refractive index is the refractive index for sodium D line.
  • the core refers to the part of the optical fiber in which most of the optical power is transmitted while being confined
  • the cladding refers to the part that is made of a substance having a lower refractive index than the core surrounding the core.
  • the core diameter is considered as the diameter of a region showing a light amount of 5% or more of the light amount at the core center.
  • the inner layer of the base material (same as the inner layer of the optical fiber) is made of a fluoropolymer composition a3 having the fluoropolymer a1 as a base material.
  • the fluorinated polymer a3 is a composition of the fluorinated polymer a1 and the refractive index adjuster a2.
  • the refractive index adjusting agent a2 has a specific distribution in concentration. That is, this concentration distribution gives a refractive index distribution described later.
  • the fluoropolymer a1 is a fluoropolymer having no C—H bond. Since the fluoropolymer a1 does not have a C—H bond, it does not absorb light having a wavelength in the near infrared region.
  • the fluorine-containing polymer a1 is preferably non-crystalline in that the scattering loss of the optical fiber can be reduced. This fluoropolymer a
  • Preferred as 1 is a fluorinated polymer having a fluorinated aliphatic ring structure in the main chain.
  • Having a fluorinated aliphatic ring structure in the main chain means that at least one of the carbon atoms constituting the aliphatic ring is a carbon atom in the carbon chain constituting the main chain, and that the carbon atom constituting the aliphatic ring is present.
  • a fluorinated aliphatic ring structure is more preferred.
  • Examples of the polymer having a fluorinated aliphatic ring structure include a monomer having a fluorinated ring structure (a monomer having a polymerizable double bond between a carbon atom constituting the ring and a carbon atom not constituting the ring). Or a monomer obtained by polymerizing a monomer having a polymerizable double bond between two carbon atoms constituting the ring) or a fluorine-containing monomer having two or more polymerizable double bonds. Polymers having a fluorinated aliphatic ring structure in the main chain obtained by cyclopolymerization are preferred.
  • Polymers having a fluorinated alicyclic structure in the main chain obtained by polymerizing a monomer having a fluorinated alicyclic structure include perfluoro (2,2-dimethyl-1,3-dioxole) and perfluoro (4 1-methyl-1-2-methylene-1, 3-dioxolane) It can be obtained by homopolymerizing a monomer having a fluorinated aliphatic ring structure such as perfluoro (2-methyl-1,4-dioxin).
  • a polymer having a fluorinated aliphatic ring structure in the main chain obtained by copolymerizing this monomer with a radical polymerizable monomer containing no C—H bond is also used, but the light transmittance is low. Homopolymers are preferred because they may decrease. Examples of the radical polymerizable monomer containing no C—H bond include tetrafluoroethylene, and trifluoroethylene.
  • a polymer having a fluorinated aliphatic ring structure in the main chain obtained by cyclopolymerization of a fluorinated monomer having two or more polymerizable double bonds is disclosed in It is disclosed in Japanese Patent Publication No. 38111/1994 and Japanese Patent Application Laid-Open No. 63-238115 / 1988. That is, by subjecting a monomer such as perfluoro (aryl vinyl ether) or perfluoro (butenyl vinyl ether) to cyclopolymerization, or by subjecting such a monomer to tetrafluoroethylene, black trifluoroethylene, or perfluoroethylene.
  • a monomer such as perfluoro (aryl vinyl ether) or perfluoro (butenyl vinyl ether)
  • a polymer having a fluorine-containing aliphatic ring structure in the main chain can be obtained.
  • homopolymers are preferred because the light transmission ⁇ fe may decrease.
  • monomers having a fluorine-containing aliphatic ring structure such as perfluoro (2,2-dimethyl-1,3-dioxole) and perfluoro (aryl vinyl ether) and perfluoro (butenyl vinyl ether).
  • a fluorine-containing monomer having two or more polymerizable double bonds By copolymerizing with a fluorine-containing monomer having two or more polymerizable double bonds, a polymer having a fluorine-containing aliphatic ring structure in the main chain can be obtained, and a fluorine-containing polymer a Used as 1.
  • a homopolymer is preferable because the light transmittance may decrease depending on the combination.
  • the refractive index adjuster a2 a compound having excellent compatibility with the fluoropolymer a1 and substantially having no CH bond is preferable. Further, it is preferable that the refractive index of the refractive index adjusting agent a2 be higher than that of the fluorine-containing polymer a1. That is, the refractive index adjusting agent a2 is preferably a high refractive index agent for the fluoropolymer a1.
  • a compound having a chlorine atom and / or an aromatic compound is preferable because of its high refractive index. Has chlorine atom Examples of such compounds include trifluoroethylene oligomers. Examples of aromatic compounds include perfluoro (1,3,5-triphenylbenzene) and perfluoro (2,4,6-triphenyl-1,3,5-triazine).
  • the outer layer of the preform (the same as the outer layer of the optical fiber) is one or more layers.
  • This outer layer is made of a resin containing no fluorine atom.
  • those resins may be the same or different.
  • the resin used for the outer layer and the resin used for the outer layer adjacent to the inner layer is a resin having a SP value difference of 4 or less, preferably 3 or less in comparison with the fluoropolymer a1.
  • the difference in SP value within 4 means that the affinity between the fluorine-containing polymer a1 in the inner layer and the resin containing no fluorine atom in the outer layer is high, and the adhesion is good. It means there is.
  • the hydrocarbon resin is not limited to a resin obtained by polymerizing a monomer consisting of only carbon atoms and hydrogen atoms, but may be obtained by polymerizing a monomer containing an oxygen atom and a Z or nitrogen atom. Resin may be used.
  • the difference in SP value between the adjacent outer layers of the resins is preferably 4 or less, particularly preferably 3 or less.
  • the viscoelastic properties of the resin of the outer layer are preferably close to those of the resin of the inner layer (fluoropolymer a 1).
  • a resin satisfying this condition has a temperature-viscosity characteristic that greatly affects the molding when the base material is spun, and is close to the resin of the inner layer, so that the base material can be stably spun.
  • the storage elastic modulus ( ⁇ ′) of the resin in the outer layer is preferably 0.7 to 1.3 times, particularly preferably 0.8 to 1.2 times, the storage elastic modulus of the fluoropolymer a1.
  • the loss elastic modulus (M ") of the resin in the outer layer is preferably 0.7 to 1.3 times, particularly preferably 0.8 to 1.2 times the loss elastic modulus of the fluoropolymer a1.
  • the storage modulus ( ⁇ ') and the loss modulus ( ⁇ ") are the values defined in JISK-7244-1, and the unit is Pa.
  • the optical fiber is of a gradient index type. That is, the inner layer of the optical fiber has a refractive index distribution. This refractive index distribution is preferably parabolic. That is, a distribution in which the refractive index is high at the center of the inner layer and becomes lower toward the periphery is preferable.
  • the refractive index distribution of the inner layer of the optical fiber is given by the fact that the inner layer of the corresponding preform has a predetermined refractive index distribution. That is, the inner layer of the base material has a high refractive index at the center and a low refractive index at the peripheral portion, and has a refractive index distribution that changes continuously.
  • the step (A) comprises forming an inner layer of an optical fiber, using a fluoropolymer a 1 as a base material, having a high refractive index in the central part, a low refractive index in the peripheral part, and a continuously changing refractive index distribution.
  • This is the step of preparing the body. That is, the step (A) is a step of preparing a columnar molded body having a specific refractive index distribution using the above-mentioned fluoropolymer a1.
  • This cylindrical shaped body may be hollow at the center along the axial direction. The following example is given as a method for producing this columnar molded body.
  • the fluoropolymer a1 is polymerized and purified by a known method.
  • the purified fluoropolymer a1 resin is filled into a metal tube. This tube is rotated at a temperature sufficiently higher than the glass transition point T al of the fluoropolymer a 1 (for example, a temperature 100 higher than T al ) to obtain a molded article having a hollow portion.
  • the molded body is cooled, and a predetermined amount of a refractive index adjuster a2 having a higher refractive index than the fluorine-containing resin a1 is introduced into the hollow portion.
  • the temperature is raised to the temperature at which the refractive index adjusting agent a2 diffuses into the fluoropolymer a1, and the refractive index adjusting agent a2 is impregnated into the fluoropolymer a1 and diffused.
  • a desired refractive index distribution can be obtained by appropriately selecting the amount of the refractive index adjusting agent a2 and the temperature and time for diffusion.
  • a resin having an SP value difference of 4 or less in comparison with the fluoropolymer a1 as an outer layer of the optical fiber is selected, and the step (B) is performed using the selected resin.
  • This is a step of preparing a cylindrical molded body that can be arranged adjacent to the outside of the cylindrical molded body in (A).
  • the resin used for the outer layer is a resin containing no fluorine atom, and a resin having a SP value difference of 4 or less compared with the fluoropolymer a1.
  • resins that satisfy this condition include When a perfluoro (butenyl vinyl ether) cyclized polymer (SP value: 5.37) is used as the fluoropolymer a1, a polymethyl methacrylate (PMMA) resin (SP value: 9.37) is used. 0 2).
  • SP value: 5.37 a perfluoro (butenyl vinyl ether) cyclized polymer
  • PMMA polymethyl methacrylate
  • a predetermined cylindrical molded body is prepared using the above-described resin.
  • the following method can be exemplified as a method for producing this cylindrical molded body.
  • One method is to extrude the above resin into a cylinder using a suitable extruder.
  • the resin is filled in a metal tube, and the tube is heated to a temperature sufficiently higher than the glass transition point of the resin. This is a method of obtaining a cylindrical molded body by rotating.
  • the size of the cylindrical molded body is determined as follows. First, when there is only one outer layer, the inner diameter of the cylindrical molded body is determined so as to have an inner diameter larger than the outer diameter of the cylindrical molded body prepared in the step (A). Further, the thickness of the cylindrical molded body, that is, the outer diameter-inner diameter of the cylindrical molded body is appropriately determined. Usually, it is determined by referring to the tensile strength required for the optical fiber. In addition, the length of the cylindrical molded body is determined to be longer than the length of the above-mentioned cylindrical molded body, because the length of the cylindrical molded body is easily handled when manufacturing the optical fiber.
  • the inner diameter is determined in the same manner as described above so that the second layer can be arranged outside the first outer layer.
  • the outer diameter of the molded body disposed inside and the outer diameter The difference from the inner diameter of the compact to be arranged is preferably within 1.5 mm, more preferably 0.1 to 1.2 mm. It is preferable that the above difference is within 1.5 mm, since the resin does not buckle during the production of the optical fiber, and the outer diameter of the resulting optical fiber is stabilized.
  • the columnar molded body of the step (A) is arranged on the innermost side, and one or more cylindrical molded bodies of the step (B) are arranged coaxially with a void provided on the outer side thereof,
  • the cylindrical molded body prepared in the step (A) and the cylindrical molded body prepared in the step (B) are arranged in combination.
  • the columnar molded body and the cylindrical molded body are coaxially arranged with a gap.
  • the cylindrical molded body is arranged coaxially with a gap. This combined set is treated as the optical fiber preform.
  • This combination process is preferably performed in a place with high cleanliness.
  • the cylindrical molded body disposed at the innermost part is easily charged by static electricity similarly to so-called fluorine resin in general, and foreign matter is easily attached thereto. Therefore, it is particularly preferable that this step (B) is performed in a clean room and at the same time as removing static electricity in an antistatic flow.
  • the clean room preferably has a cleanliness of class 6 or less, and more preferably has a cleanliness of class 5 or less, as defined by JIS B-9920.
  • the step (D) is a step of preparing a first heating furnace and a second heating furnace, each of which can independently adjust the temperature.
  • the preform is preheated in the first heating furnace, and after the preform is heated to a certain temperature or higher, the preform is guided to the second heating furnace to produce an optical fiber.
  • Both the first heating furnace and the second heating furnace are preferably annular furnaces for uniformly heating the base material.
  • the first heating furnace is disposed vertically above the second heating furnace. Further, the first heating furnace and the second heating furnace have a common vertically extending central axis. Along the common central axis, the base material is moved downward from above, first inserted into the first heating furnace, and then inserted into the second heating furnace. At this time, the central axis of the base material is also arranged in the same manner as the common central axis.
  • the first heating furnace and the second heating furnace may be heating furnaces incorporating a heating element such as a resistance wire or heating furnaces such as halogen lamps. These two types of heating furnaces have different center wavelengths of emitted light.
  • the wavelength of the heating furnace incorporating a heating element such as a resistance wire is 3 to 9 m, and the heating furnace such as a halogen lamp has a wavelength of 0.5 to 9 m. ⁇ 1.5 m.
  • the first heating furnace is preferably a heating furnace in which the center wavelength of the emitted light beam is 0.5 to 1.5 im.
  • the second heating furnace a heating furnace in which the center wavelength of the emitted light is 0.5 to 1.5 m is preferable.
  • the inner diameter of the first heating furnace is preferably 1.5 to 2 times the outer diameter of the base material (the outer diameter of the cylindrical molded body disposed on the outermost layer of the outer layer).
  • the inner diameter of the heating furnace means the diameter of a circle that is inscribed in the internal space when a vertical section is taken in the longitudinal direction of the heating furnace (vertical direction when spinning). I do. If the inner diameter of the heating furnace is larger than this range, that is, if the gap between the base material and the heating furnace is large, the production of the optical fiber is not preferable because it is not stable.
  • the length (vertical direction) of the first heating furnace is preferably 1 to 7 times, more preferably 2 to 5 times the inner diameter of the heating furnace. If the length is shorter than the above range, the heating tends to be insufficient. If the length is longer than the above range, the base material feeding device tends to be too large, which is not preferable.
  • the inner diameter of the second heating furnace is preferably 1.02 to 1.67 times, more preferably 1.05 to 1.54 times, and more preferably 1.1 to 1.5 times the outer diameter of the base material. 8-1.43 times is particularly preferred. That is, the outer diameter of the base material is preferably 60 to 98%, more preferably 65 to 95%, and particularly preferably 70 to 85% with respect to the inner diameter of the second heating furnace. If the inner diameter of the heating furnace is larger than this range, that is, if the gap between the preform and the heating furnace is large, it is not preferable because the production of the optical fiber, in particular, the fluctuation of the wire diameter is difficult to stabilize.
  • the length (vertical direction) of the second heating furnace is preferably 2 to 6 times, more preferably 3 to 5 times the inner diameter of the heating furnace. If the length is shorter than the above range, the heating tends to be insufficient, and if the length is longer than the above range, the fluctuation in the diameter of the manufactured optical fiber tends to increase, which is not preferable.
  • the wire diameter of the optical fiber is the outer diameter of the optical fiber.
  • the variation in the diameter of the optical fiber is a variation in the diameter of the optical fiber in the longitudinal direction, and is represented by a variation range with respect to the average diameter.
  • the temperature of the first heating furnace and the temperature of the second heating furnace can be adjusted independently.
  • Thermal isolation means that an air gap is provided between the first heating furnace and the second heating furnace to suppress thermal interference between the furnace bodies due to radiation and heat conduction. And that the effect of the ascending airflow generated in the second heating furnace on the first heating furnace is suppressed.
  • the distance between the first heating furnace and the second heating furnace is preferably 0.5 to 2 times the outer diameter of the base material. If the length is shorter than this range, the second furnace tends to cause thermal interference with the first furnace, and if the length is longer than this range, the base material heated in the first furnace is excessively cooled. Both are not preferred.
  • FIG. 1 is a sectional view of an example of a heating furnace.
  • the heating furnace 20 has a furnace body 21, a sealing portion 22, and two circular tubes 23 a and 23 b.
  • the furnace body 21 is cylindrical and has two furnace openings.
  • a seal portion 22 is provided at one furnace opening, and two circular tubes 23a and 23b are provided at the other furnace opening.
  • the seal portion 22 is in the form of a film having elasticity, and has a circular opening 22a and a small opening 22b.
  • the circular opening 22 a is provided in the seal portion 22 around the center axis of the furnace body 21.
  • a plurality of small openings 22b are arranged around the circular opening 22a of the seal portion 22.
  • the two circular tubes 23 a and 23 b are arranged so as to have the same central axis as the central axis of the furnace body 21.
  • the circular tubes 23a and 23b are arranged so as to have a gap.
  • the circular tube 23a has a smaller inner diameter than the circular tube 23b.
  • One opening of the circular tube 23 a is arranged inside the furnace body 21.
  • the furnace body 21 has a cylindrical shape, and a heating element (not shown) such as a resistance wire is incorporated in the furnace body.
  • An optical fiber preform is inserted into a cylindrical space in the furnace and spun to produce an optical fiber. It is preferable that the portion where the heating element is incorporated, that is, the effective heating surface is provided at 80% or more of the length of the furnace body. This means that most of the furnace inner surface is used as a heat generating surface, and it is preferable to shorten the length of the furnace body as a whole.
  • the seal portion 22 is provided at the upper portion of the furnace opening when spinning the base material.
  • the seal portion 22 is provided to suppress excessive release of heat in the furnace due to convection.
  • the material of the seal portion 22 is not limited as long as it has elasticity and can withstand the temperature environment of the furnace, but a preferred specific material is silicone rubber.
  • the shape of the seal portion 22 will be described with reference to FIG. FIG. 2 is a top view of the seal portion.
  • the seal portion 22 has a circular opening 22a and a small opening 22b.
  • the circular opening 22a is a portion into which the base material is inserted.
  • the size of the circular opening 22a is smaller than the diameter of the base material to be spun.
  • the diameter of the circular opening 22a is preferably from 97% to less than 100%, more preferably from 98.5 to 99.5%, based on the diameter of the base material. If the diameter of the circular opening 22a is larger than the diameter of the base material, that is, if there is a gap between the base material and the seal, convection is generated and the airflow on the surface of the base material is disturbed. Fluctuations are less likely to be suppressed. On the other hand, if it is smaller than the above range, the seal portion is not preferable because it becomes a resistance when the base material is inserted into the heating furnace.
  • Twenty small openings 22b are arranged around the circular opening 22a. These small openings are provided to prevent heat from accumulating inside the furnace. If this small opening is not provided, heat will be trapped inside the furnace, causing an excessive rise in the furnace temperature, making it difficult to manufacture with a stable wire diameter. It is preferable that the small opening 22b is provided so as not to be adjacent to the circular opening 22a. That is, it is preferable that two types of openings, the circular opening and the small opening, are not provided continuously. This is to suppress the turbulence of the air flow on the base metal surface.
  • each small opening are determined as appropriate from the size of the furnace opening and the size of the base material.
  • the difference between the area of the furnace opening and the cross-sectional area of the base material is defined as the total seal area.
  • the total area of the small openings is preferably 5 to 15% of the total area of the seal, and more preferably 8 to 13%. If the total area of the small openings is less than 5% of the total area of the seal, heat is trapped inside the furnace, which is not preferable. Similarly, if it exceeds 15%, the heat inside the furnace tends to be excessively released due to convection, and as a result, the air flow inside the furnace tends to be turbulent, which is not preferable from the viewpoint of suppressing wire diameter fluctuation. Further, it is preferable that the small openings are uniformly distributed along the circumference.
  • two circular tubes 23 a and 23 b are provided at the furnace opening of the furnace body 21 where the seal portion 22 is not provided.
  • these circular tubes are provided in the lower part of the furnace opening when spinning the base material.
  • the material of the tube is not limited as long as it can withstand the temperature environment of the furnace. Specific materials include ceramics such as silica and alumina; metals such as aluminum and stainless steel; or Glass.
  • a transparent glass is preferable in that the positioning is easy by visual observation.
  • This circular pipe is provided for the following purpose.
  • a circular pipe with the smallest inside diameter is provided to suppress airflow near the base material.
  • Other tubes are provided to suppress and rectify the airflow inside the furnace and to eliminate the effects of disturbances.
  • the strain speed is the amount of increase in strain per unit time, and means the speed of deformation of the base material.
  • the region where the strain rate is large is the region before and after the base material is spun and passes through the lower opening of the heating furnace.
  • the diameter of the base material approaches the diameter of the final optical fiber, and the linear velocity increases. If the airflow is turbulent here, the change in the temperature of the base metal surface due to the turbulence in the airflow near the base metal will increase, which will have a large effect on wire diameter fluctuations.
  • the two or more circular tubes and the furnace body are provided so as to share a central axis. This is because the base material is placed on the central axis of the furnace so that the base material is heated evenly when the base material is spun.
  • the circular tubes are arranged so as to have a void (gap). This is necessary to maintain airflow so that heat does not accumulate inside the furnace.
  • two or more circular pipes are provided. The upper limit of this number is not limited as long as the gap between the circular tubes is secured.
  • the inner diameter (diameter) of the circular pipe having the smallest inner diameter among the above-mentioned circular pipes is small. More specifically, the inner diameter is preferably 10 to 30 times the final diameter of the optical fiber (meaning the diameter of the optical fiber when it has exited the heating furnace and cooled to room temperature). For example, when manufacturing an optical fiber having a final wire diameter of 0.5 mm, the inner diameter is preferably 5 to 15 mm.
  • One opening of the circular tube having the minimum inner diameter is disposed inside the furnace body. This is because the region with a high strain rate described above extends before and after the lower opening of the furnace and extends to the inside of the furnace.
  • the length of the opening of the circular tube having the minimum inner diameter inserted into the furnace is preferably 1 to 5 times the inner diameter of the circular tube. However, it is provided so that it does not come into contact with the base material.
  • the length of the circular pipe with the smallest inside diameter is It is preferably 15 to 100 times. Within this length range, the effect of suppressing the fluctuation of the wire diameter can be sufficiently obtained. There is no major inconvenience even if it is longer than this, but operability is reduced.
  • the inner diameter of the circular pipe having the largest inner diameter is smaller than the diameter of the lower opening of the furnace.
  • the inner diameter of this circular tube is preferably 50 to 95%, more preferably 60 to 80% of the diameter of the lower opening of the furnace.
  • no gap is provided between the circular tube and the furnace body, that is, it is preferable that an airflow does not enter the furnace from outside the circular tube.
  • the length of this circular tube is preferably 3 to 8 times the inner diameter.
  • the inner diameter and length are appropriately determined according to the largest circular pipe. That is, the inner diameter is preferably determined in the range of 10 to 95%, more preferably in the range of 15 to 70% with respect to the circular pipe provided one outside.
  • the length is preferably determined in a range of 3 to 8 times the inner diameter of the circular tube.
  • the step (E) is a step of reducing the pressure of the voids of the base material to 1 to 1.4 kPa with respect to the atmospheric pressure.
  • the voids of the base material are defined as the voids between the cylindrical molded body prepared in the step (A) and the cylindrical molded body disposed immediately outside the cylindrical molded body, and when two or more outer layers are provided. The voids between adjacent outer layers are collectively represented.
  • the void includes the hollow portion when the columnar molded body prepared in the step (A) has a hollow portion.
  • a seal is provided at the tip of the base material (the end that is inserted into the heating furnace first), and the upper end of the base material (the end opposite to the tip).
  • a jig for reducing the pressure in the above gap is provided.
  • a jig provided with an opening connected to a decompression means such as a vacuum pump is provided in a base material holder for introducing the base material into the heating furnace.
  • a decompression means such as a vacuum pump
  • the optical fiber preform is subjected to T al to This is the step of heating to (T al +40).
  • the optical fiber is stably manufactured by preheating the preform and then heating and spinning in the present invention.
  • the temperature at which the base material is heated is the temperature at the center of the base material at the outlet (lower opening) of the first heating furnace.
  • the base material is sufficiently heated to a temperature at which substantially no melt deformation occurs. As a result, fluctuations in the diameter of the optical fiber are suppressed, and variations in the transmission loss of the manufactured optical fiber are reduced.
  • Heating to a temperature higher than the above temperature range is not preferred because the base material tends to start melting and deforming.
  • the temperature is lower than the above-mentioned temperature range, the fluctuation of the optical fiber diameter is difficult to be suppressed, and the variation in the transmission loss of the manufactured optical fiber tends to increase.
  • the molding becomes unstable for the following reasons.
  • a resin material having a relatively low heat transfer coefficient is selected as the base material.
  • the heat transfer coefficient of the fluorine-containing polymer a1 in the inner layer is very low, similarly to a general fluororesin.
  • the base material has a multilayer structure and has voids, there are many problems in heating the central portion of the base material to a predetermined temperature. For example, if the central part, which has been cooled to room temperature, is heated to a temperature at which it can be melt-formed, and if it is to be heated in a short time from the outside, the outer peripheral part needs to be at a considerably high temperature.
  • the resin at the outer peripheral portion is melted and deformed first, and the viscosity is greatly different between the inside and outside of the base material.
  • the soft outer part and the hard center part are formed at the same time, and the forming becomes unstable. Therefore, it is necessary to perform predetermined heating by the first heating furnace.
  • the cross section of the base material (the cross section perpendicular to the long axis of the base material) It is preferable that the temperature difference is small and that the entire temperature is uniform, since the production of the optical fiber is stabilized.
  • the temperature difference between the central portion and the outer peripheral portion of the base material in the cross section of the base material is preferably 3 °: or less, and more preferably 10 ° or less.
  • first heating furnace is required to perform predetermined heating is that the provision of the first heating furnace reduces the load of the second heating furnace heating the base material, and reduces the temperature of the base material. Can be spun in a more precisely controlled state.
  • the first heating furnace it is preferable to use a heating furnace in which the center wavelength of the emitted light is 0.5 to 1.5 m.
  • a heating furnace By employing such a heating furnace, it is possible to relatively easily heat the central portion of the base material. This is because light in the above wavelength range has excellent resin permeability and is suitable for heating the central portion of the base material.
  • the central portion of the preform is stably heated, and the optical fiber can be stably manufactured. In particular, it is possible to manufacture an optical fiber having a low transmission loss over a long distance.
  • step (G) is a step of spinning the base material heated in the first heating furnace in the second heating furnace. That is, the preform heated in the first heating furnace and preheated to a predetermined temperature is inserted into the second heating furnace and heated to a predetermined molding temperature, whereby the preform is spun to form an optical fiber. Manufactured.
  • the diameter of the optical fiber to be manufactured is determined by the ratio between the feed speed of the preform and the take-up speed of the optical fiber.
  • the take-up speed of the optical fiber is adjusted by the rotation speed of the take-up roller.
  • a wire diameter measuring device for measuring the wire diameter of the optical fiber online is provided at an appropriate position before and after the take-off roller, and the wire diameter is obtained from the data obtained from the wire diameter measuring device. It is preferable that the fluctuation tendency of the wire diameter is suppressed, and the fluctuation of the wire diameter is suppressed by adjusting the rotation speed of the take-off roller based on the prediction.
  • the suppression of wire diameter variation by controlling the airflow described above is effective in suppressing wire diameter variation with a variation cycle of less than 5 seconds.
  • a wire diameter measuring device for measuring a wire diameter in a non-contact manner is preferable, and a specific example is a wire diameter measuring device using a laser beam.
  • the position of the base material feeding device for inserting the base material into the heating furnace and the position of the heating furnace can be adjusted in the horizontal direction. This is because the fact that the base material is always spun at the center of the heating furnace in the horizontal direction is effective for uniform spinning.
  • the heating furnace it is conceivable that the center will shift from the center. At this time, the base material is subjected to uneven heating, and uniform spinning cannot be performed. In order to prevent such uneven heating, it is preferable that the position can be adjusted.
  • the same effect can be obtained by adjusting the position regardless of whether the base material feeding device is moved or the heating furnace is moved.
  • the base material mounting jig of the base material feeding device can be provided with a horizontal position fine adjustment mechanism.
  • the displacement of the optical fiber is detected by the wire diameter measuring device described above, and based on this measurement, the base metal mounting jig can be slightly moved in the horizontal direction using a servomotor. . If this position adjusting mechanism is provided, a pipe having a smaller inner diameter can be adopted as a circular pipe provided at the lower part of the second heating furnace, and the effect of suppressing fluctuations in the wire diameter can be improved.
  • FIG. 3 is a schematic cross-sectional view illustrating the manufacturing method of the present invention.
  • the base material 31 has an inner layer 31a and an outer layer 31b.
  • the base material 31 is heated to a predetermined temperature in the first heating furnace 10 and melted and spun in the second heating furnace 20.
  • the second heating furnace has a sealing part 22 and two circular tubes.
  • the seal portion 22 has a small opening 22a.
  • the two pipes are a small pipe 23a and a large pipe 23b, and the large pipe 23b has a flange 23c.
  • the base material 31 is attached to a base material attachment jig 41, and is attached to a base material feeder (not shown) via the base material attachment jig 41.
  • the base material mounting jig 41 has an exhaust hole 41a.
  • the preform 31 is spun and taken up by the take-up roller 42 to produce an optical fiber.
  • the base material was prepared by the following method. Cyclopolymerization of perfluoro (butenyl vinyl ether) gave transparent fluororesin P1. This corresponds to fluoropolymer a1 .
  • the refractive index of the fluororesin P1 is 1.342, the glass transition point is 108, and the SP value is 5.37.
  • the storage elastic modulus at 1 Hz is 2740 Pa, and the loss elastic modulus is 12000 Pa as well.
  • the fluororesin P1 was purified by a known method to remove foreign substances and residual volatile components. The purified fluororesin P1 was filled in a metal tube.
  • the tube is rotated in a hot air circulating oven maintained at 240 to form a circle with an inner diameter of 6.0 mm, an outer diameter of 19.6 mm, a length of 500 mm, and a hollow center in the center.
  • a columnar molded body was obtained.
  • 3.5 g of perfluoro (1,3,5-triphenylbenzene) (hereinafter referred to as TPB) was injected as a refractive index adjuster into the hollow portion of the cylindrical molded body and kept at 230 ° C.
  • TPB perfluoro (1,3,5-triphenylbenzene)
  • a cylindrical molded body was manufactured using polymethyl methacrylate (PMMA) resin (trade name: Acrypet TF-8, manufactured by Mitsubishi Rayon Co., Ltd.).
  • PMMA polymethyl methacrylate
  • the refractive index of this PMMA resin is 1.492
  • the glass transition point is 110
  • the SP value is 9.02.
  • the storage elastic modulus at 230 Hz and 1 Hz of PMMA resin is 3080 Pa
  • the loss elastic modulus is 11800 Pa.
  • fluororesin P1 PMMA resin was filled into a metal tube and rotated in a hot air circulating oven maintained at 240 ° C.
  • a cylindrical molded body having an inner diameter of 20.2 mm, an outer diameter of 40.0 mm, and a length of 600 mm was obtained.
  • the cylindrical molded body based on the fluororesin P1 is inserted into the hollow portion of the PMMA resin cylindrical molded body obtained above, and a gap is provided between the two molded bodies to be coaxially arranged. And used it as a base material.
  • the work of preparing the base material was performed in a class 5 clean room specified in JIS B-9920, and the static electricity was removed in a static current flow.
  • the following furnaces were prepared.
  • the first heating furnace 10 an annular furnace having a furnace body having an inner diameter of 78 mm and a length of 190 mm was prepared.
  • a resistance wire and a thermocouple are embedded inside the furnace, and the amount of heat generated, that is, the furnace temperature, is adjusted by adjusting the amount of current.
  • the second heating furnace 20 an annular furnace having a furnace body having an inner diameter of 54 mm and a length of 230 mm was prepared.
  • a resistance wire and a thermocouple are embedded inside the furnace body, and the temperature inside the furnace is adjusted as in the first heating furnace.
  • a silicone rubber seal 22 having a diameter of 70 mm and a thickness of 2 mm was provided.
  • This seal has a circular opening with a diameter of 39.5 mm, and 32 small openings 2 2a around the circular opening (each having a diameter of 2 mm). ) And are provided.
  • a base material is inserted into the circular opening.
  • Two circular tubes (a large circular tube 23b and a small circular tube 23a) were provided below the furnace body of the second heating furnace 22. These two tubes 23a and 23b are provided to rectify the airflow near the base material of the second heating furnace and to suppress the fluctuation of the diameter of the manufactured optical fiber.
  • the great circular tube 23b has an inner diameter of 37 mm, an outer diameter of 38 mm and a length of 150 mm and is made of aluminum.
  • This large circular tube 23b was provided with a flange 23c at one opening. By fixing the flange 23c to the furnace body, the large circular tube 23b was fixed to the lower part of the furnace body. In other words, there was no gap between the furnace body and the large pipe 23b.
  • the large circular tube 23b was not inserted into the furnace, but was provided on the lower surface of the furnace body.
  • the small circular tube 23a is a glass tube having an inner diameter of 10 mm, an outer diameter of 12 mm, and a length of 200 mm.
  • One opening of the small circular tube 23a was inserted into the furnace, and fixed at a position 20 mm from the lower opening end of the furnace body (the position corresponding to the lower surface of the furnace body was set to 0 mm). .
  • the fixed position was fixed so that it could be changed, that is, the length inserted into the furnace body could be changed.
  • the first heating furnace 10 and the second heating furnace 20 provided such that the furnace body, the two circular tubes, and the seal portion share a central axis, It was installed at a distance of 70 mm.
  • a take-up roller 42 was set below the second heating furnace 20 at a position of 1. lm from the lower surface of the furnace body.
  • a wire diameter measuring device (LS500, manufactured by KEYENCE CORPORATION) using a laser beam was installed 0.2 m above the take-up roller 42.
  • the number of wire diameter measurements was 1200 times per second.
  • the rotation speed of the take-off roller 42 was obtained by recording the measurement result of the wire diameter measuring device into a computer.
  • the tendency of wire diameter fluctuation was predicted, and based on this prediction, the rotation speed of the take-off roller 42 was automatically controlled by a computer.
  • the first heating furnace 10, the second heating furnace 21, and the pickup The roller 42 and the wire diameter measuring device were mounted on a gantry and adjusted so that they were arranged on the same vertical line.
  • a base material feeder was prepared to send the base material 31 above the first heating furnace on the same vertical line.
  • the base material 31 was attached to the base material feeder via a base material mounting jig 41.
  • the base material attaching jig 41 has an exhaust hole 41a, and the gap of the base material 31 is reduced to a predetermined pressure through the exhaust hole 41a.
  • the above preparations were made, and an optical fiber was manufactured under the conditions shown in each example.
  • the wire diameter variation was represented by a deviation from the average value of the wire diameter measured by the wire diameter measuring device.
  • the records for 10 minutes during the production of the optical fiber were statistically processed, and the average value and standard deviation were obtained. Three times the standard deviation is regarded as a deviation. For example, when three times the standard deviation is 5 / m, the standard deviation is expressed as 5 / m.
  • the following connection loss test was conducted to evaluate the effect of wire diameter fluctuation on connection loss.
  • An 850 nm LED light source and an optical power meter (MS9002C, manufactured by Anritsu Corporation) were used.
  • 330 m of an optical fiber manufactured under the same conditions was used.
  • the transmission loss of the entire optical fiber was measured.
  • the optical power meter was cut at 1 m.
  • the cut end faces were each polished, and the cut end faces were optically connected to each other using a ceramic ferrule.
  • the loss due to this connection was measured.
  • the lm part from the optical power meter was left as it was, including the ferrule.
  • the 329 m section on the opposite side was cut at a position of 20 cm from the previously cut end face, and the cut end face was polished.
  • the newly polished end was fitted with a ceramic ferrule that had been removed from the 20 cm cut-out.
  • the connection loss was measured in the same manner. This was performed 10 times in total, and an average value of 10 times was obtained.
  • An optical fiber was manufactured under the following conditions.
  • the base material was introduced into the second heating furnace through the first heating furnace at a speed of 1.8 m by the base material feeding device.
  • the set temperature of the first heating furnace was 135 3 ⁇ .
  • the set temperature of the second heating furnace was 245 :.
  • the material was taken off by a take-off roller at a speed of 12.5 mZ.
  • the temperature at the center of the base material at the outlet of the first heating furnace was 13 2:, and the temperature at the outer peripheral portion of the base material was 13 5.
  • the gap of the base material is The pressure was reduced to 1.4 kPa. Under the above conditions, an optical fiber having an inner layer having a refractive index distribution and an average wire diameter of 492 m was manufactured.
  • the variation in the diameter of the manufactured optical fiber was 5 / m of soil.
  • the average value of the connection loss was 0.32 dB.
  • various structural parameters of the optical fiber were measured in accordance with the near field pattern method (video analyzer method) specified in JIS C-16862.
  • the measuring device used was LEPAS-11 manufactured by Hamamatsu Photonics.
  • the core diameter was 120 mm
  • the core non-circularity was 1.5%
  • the numerical aperture ( ⁇ ) was 0.185.
  • the transmission loss was measured using 330 m of the manufactured optical fiber according to the cutback method specified in JISC-6823, it was 25 dBZkm at a wavelength of 850 nm.
  • An optical fiber was manufactured in the same manner as in Example 1, except that the following radiation furnace was used as the first heating furnace.
  • the radiant furnace used was an annular furnace equipped with three halogen lamps (manufactured by Shio Lighting Co., Ltd., trade name: UL-HU-P / ML 195 S / AGX3).
  • the temperature at the center of the base material at the outlet of the first heating furnace was 134 :, and the temperature at the outer periphery of the base material was 135.
  • the variation in the diameter of the manufactured optical fiber was ⁇ 3 m.
  • the core diameter was 122 mm
  • the core non-circularity was 1.3%
  • the NA was 0.183.
  • the transmission loss was 20 dB / km at a wavelength of 850 nm.
  • the upper end of the small tube was fixed at a distance of 2 Omm from the inside of the furnace (a state of being 2 Omm away from a position corresponding to the lower surface of the furnace body). As a result, the diameter variation was ⁇ 25 m. The average value of the splice loss was 0.74 dB.
  • Example 2 The test was performed in the same manner as in Example 1 except that a glass tube having an inner diameter of 7 mm, an outer diameter of 1 Omm, and a length of 20 Omm was used instead of the small circular tube. As a result, the variation in wire diameter was 2 m. The average value of the connection loss was 0.19 dB.
  • Example 5 The test was performed in the same manner as in Example 1 except that the great circular pipe was removed. As a result, the fluctuation of the wire diameter was 10 m / m. The average value of the connection loss was 0.53 dB.
  • Example 2 The test was performed in the same manner as in Example 1 except that all the small openings of the seal portion were covered with a heat-resistant adhesive tape. As a result, the fluctuation of the wire diameter was ⁇ 10 / m. The average value of the connection loss was 0.55 dB.
  • a glass tube having an inner diameter of 7 mm, an outer diameter of 10 mm, and a length of 750 mm was used instead of the small circular tube, and the mechanism for finely moving the base material feeder in the horizontal direction was operated.
  • a test was performed in the same manner as in Example 1. As a result, the variation in wire diameter was ⁇ 1 xm. The average connection loss was 0.1 dB.
  • An optical fiber was manufactured in the same manner as in Example 1, except that a polycarbonate resin (trade name: Lexan SP1310, manufactured by GE Japan) was used as the outer layer.
  • This polycarbonate resin has a refractive index of 1.586, a glass transition point of 128 t :, and an SP value of 9.59.
  • the temperature at the center of the base material at the outlet of the first heating furnace was 131, and the temperature at the outer periphery of the base material was 135.
  • the variation in the diameter of the manufactured optical fiber was ⁇ 30 / zm.
  • the core diameter was 118 mm
  • the core non-circularity was 3.5%
  • the NA was 0.188.
  • the transmission loss was 176 dBZkm at a wavelength of 850 nm.
  • a plastic optical fiber having low transmission loss can be produced stably. This is probably because the adhesion between the inner layer and the outer layer was improved. Further, in particular, when the heating furnace according to the present invention is used, the fluctuation of the wire diameter during the production of the plastic optical fiber can be suppressed, and the connection loss between the optical fibers due to the fluctuation of the wire diameter can be suppressed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

La présente invention concerne un procédé de production de fibre optique en plastique présentant de façon stable un faible niveau de perte en transmission. Ce procédé de production se décompose en plusieurs opérations. On commence (A) par se procurer un moulage en colonne composé d'un polymère (a1) contenant du fluor comme matière de base, présentant une distribution spécifiée de l'indice de réfraction et servant de couche intérieur de fibre optique. On se procure ensuite (B) un moulage tubulaire servant de couche extérieure à la fibre optique et utilisant une résine présentant une différence de valeur SP n'excédant pas 4 par rapport au polymère précédent (a1). On se procure alors (C) un matériau parent de la fibre optique, et pour cela, on agence le moulage en colonne dans la partie la plus intérieure et le moulage tubulaire sur l'extérieur correspondant. L'opération suivante consiste à se procurer (D) deux fourneaux dont les températures sont régulées de façon indépendante. On réalise dès lors (E) une réduction de pression dans l'intervalle d'air du matériau parent de 1 à 1,4 kPa en partant de la pression atmosphérique. Le procédé comporte ensuite (F) une opération de chauffage du matériau parent jusqu'à une température spécifiée en utilisant le premier des fourneaux, à la suite de quoi (G) on file dans le deuxième fourneau le matériau parent, qui a déjà été chauffé dans le premier fourneau.
PCT/JP2003/006764 2002-05-30 2003-05-29 Procede de production de fibre optique en plastique WO2003102641A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003241912A AU2003241912A1 (en) 2002-05-30 2003-05-29 Method for producing plastic optical fiber
JP2004509466A JPWO2003102641A1 (ja) 2002-05-30 2003-05-29 プラスチック製光ファイバの製造方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2002157369 2002-05-30
JP2002-157369 2002-05-30
JP2002-157370 2002-05-30
JP2002157370 2002-05-30

Publications (1)

Publication Number Publication Date
WO2003102641A1 true WO2003102641A1 (fr) 2003-12-11

Family

ID=29714296

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2003/006764 WO2003102641A1 (fr) 2002-05-30 2003-05-29 Procede de production de fibre optique en plastique

Country Status (3)

Country Link
JP (1) JPWO2003102641A1 (fr)
AU (1) AU2003241912A1 (fr)
WO (1) WO2003102641A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014081596A (ja) * 2012-10-18 2014-05-08 Kuraray Co Ltd 中空型光ファイバ及び複合型光ファイバ、並びにそれらの製造方法
KR101810929B1 (ko) * 2017-06-09 2018-01-25 주식회사 제씨콤 광섬유어레이 연결용 블록의 제조방법

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0421538A (ja) * 1990-05-16 1992-01-24 Furukawa Electric Co Ltd:The 光ファイバの線引き方法
JPH06199537A (ja) * 1993-01-05 1994-07-19 Sumitomo Electric Ind Ltd 光ファイバ線引炉
JPH08106015A (ja) * 1994-10-05 1996-04-23 Sumitomo Electric Ind Ltd プラスチック光ファイバの線引方法
JPH08201637A (ja) * 1995-01-23 1996-08-09 Nippon Petrochem Co Ltd 合成樹脂光伝送体の連続的製造方法
JPH092831A (ja) * 1995-06-22 1997-01-07 Sumitomo Electric Ind Ltd 光ファイバ線引き方法および線引き炉
JPH0986949A (ja) * 1995-09-21 1997-03-31 Mitsubishi Cable Ind Ltd 光ファイバの線引方法及び線引装置
JPH1179777A (ja) * 1997-09-05 1999-03-23 Fujikura Ltd 光ファイバの紡糸装置
JPH1184145A (ja) * 1997-09-11 1999-03-26 Sumitomo Wiring Syst Ltd プラスチック光ファイバの線引装置における加熱炉
JPH11109144A (ja) * 1997-10-07 1999-04-23 Mitsubishi Rayon Co Ltd 屈折率分布型光ファイバ及びその製造方法
JP2000347044A (ja) * 1999-06-01 2000-12-15 Sumitomo Electric Ind Ltd プラスチック光ファイバ母材及びプラスチック光ファイバの製造方法
JP2002116327A (ja) * 2000-10-11 2002-04-19 Kuraray Co Ltd 透明プラスチック線状体の製造方法

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0421538A (ja) * 1990-05-16 1992-01-24 Furukawa Electric Co Ltd:The 光ファイバの線引き方法
JPH06199537A (ja) * 1993-01-05 1994-07-19 Sumitomo Electric Ind Ltd 光ファイバ線引炉
JPH08106015A (ja) * 1994-10-05 1996-04-23 Sumitomo Electric Ind Ltd プラスチック光ファイバの線引方法
JPH08201637A (ja) * 1995-01-23 1996-08-09 Nippon Petrochem Co Ltd 合成樹脂光伝送体の連続的製造方法
JPH092831A (ja) * 1995-06-22 1997-01-07 Sumitomo Electric Ind Ltd 光ファイバ線引き方法および線引き炉
JPH0986949A (ja) * 1995-09-21 1997-03-31 Mitsubishi Cable Ind Ltd 光ファイバの線引方法及び線引装置
JPH1179777A (ja) * 1997-09-05 1999-03-23 Fujikura Ltd 光ファイバの紡糸装置
JPH1184145A (ja) * 1997-09-11 1999-03-26 Sumitomo Wiring Syst Ltd プラスチック光ファイバの線引装置における加熱炉
JPH11109144A (ja) * 1997-10-07 1999-04-23 Mitsubishi Rayon Co Ltd 屈折率分布型光ファイバ及びその製造方法
JP2000347044A (ja) * 1999-06-01 2000-12-15 Sumitomo Electric Ind Ltd プラスチック光ファイバ母材及びプラスチック光ファイバの製造方法
JP2002116327A (ja) * 2000-10-11 2002-04-19 Kuraray Co Ltd 透明プラスチック線状体の製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014081596A (ja) * 2012-10-18 2014-05-08 Kuraray Co Ltd 中空型光ファイバ及び複合型光ファイバ、並びにそれらの製造方法
KR101810929B1 (ko) * 2017-06-09 2018-01-25 주식회사 제씨콤 광섬유어레이 연결용 블록의 제조방법

Also Published As

Publication number Publication date
AU2003241912A1 (en) 2003-12-19
JPWO2003102641A1 (ja) 2005-09-29

Similar Documents

Publication Publication Date Title
Barton et al. Fabrication of microstructured polymer optical fibres
JP5514802B2 (ja) 押出原料供給装置及びこれを用いた光伝送体の製造方法
US7460756B2 (en) Plastic optical fiber and method for manufacturing the same
KR20010112609A (ko) 플라스틱 광학 섬유
JP4232172B2 (ja) 屈折率分布型光ファイバーの製造方法
US20080260339A1 (en) Manufacture of depressed index optical fibers
US5958103A (en) Process for producing preform for glass fiber and process for producing glass fiber
JPS59162504A (ja) 光学繊維の製造方法
US20070259107A1 (en) Method and Apparatus for Coating Plastic Optical Fiber with Resin
JP5521480B2 (ja) プラスチッククラッド光ファイバ心線および光ファイバケーブル
WO2003102641A1 (fr) Procede de production de fibre optique en plastique
US20090098401A1 (en) Plastic optical fiber preform and production method thererof
EP1730557A1 (fr) Procede et appareil pour la fabrication de fibre optique en matiere plastique
CN113716862B (zh) 光纤的制备方法及其装置
KR101041756B1 (ko) 플라스틱 광학 파이버 및 그 제조 방법
US6304704B1 (en) Mode mixing buffered optical fiber apparatus and method for making
WO2021128213A1 (fr) Fibre optique et son procédé de formation
JP2006178086A (ja) 光ファイバコード及びその製造方法
CN115951445B (zh) 抗弯曲高耐压光纤及其制备方法
JP5235426B2 (ja) プラスチック光ファイバケーブルの製造方法
JP2007108304A (ja) プラスチック光学材料用プリフォームの製造方法及び製造機
JPH10268146A (ja) プラスチック光ファイバーおよびその製造方法
JPS61236636A (ja) 光フアイバのジヤケツト被覆方法
JP2005321721A (ja) プラスチック光ファイバの製造装置及び製造方法
TW202144163A (zh) 塑膠光纖之製造方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PH PL PT RO RU SC SD SE SG SK SL TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2004509466

Country of ref document: JP

122 Ep: pct application non-entry in european phase