WO2017038396A1 - Procédé et dispositif de mesure de la tension de ligne d'une fibre optique - Google Patents

Procédé et dispositif de mesure de la tension de ligne d'une fibre optique Download PDF

Info

Publication number
WO2017038396A1
WO2017038396A1 PCT/JP2016/073289 JP2016073289W WO2017038396A1 WO 2017038396 A1 WO2017038396 A1 WO 2017038396A1 JP 2016073289 W JP2016073289 W JP 2016073289W WO 2017038396 A1 WO2017038396 A1 WO 2017038396A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fiber
bare optical
preliminary
drawing tension
bare
Prior art date
Application number
PCT/JP2016/073289
Other languages
English (en)
Japanese (ja)
Inventor
浩輝 濱口
Original Assignee
株式会社フジクラ
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 株式会社フジクラ filed Critical 株式会社フジクラ
Publication of WO2017038396A1 publication Critical patent/WO2017038396A1/fr

Links

Images

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
    • C03B37/03—Drawing means, e.g. drawing drums ; Traction or tensioning devices
    • C03B37/035—Drawing means, e.g. drawing drums ; Traction or tensioning devices having means for deflecting or stripping-off fibres or for removing defective parts
    • 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
    • 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

Definitions

  • the present invention relates to an optical fiber drawing tension measuring method and a drawing tension measuring apparatus.
  • the base material is melted in a heating furnace, the bare optical fiber is taken, and the resin is applied and cured around the glass portion of the bare optical fiber, and then the optical fiber There is a drawing process.
  • drawing tension is an important parameter that affects the characteristics of the optical fiber. This corresponds to the tensile tension applied to the optical fiber by pulling, and even in an optical fiber drawn by the same optical fiber preform, the optical characteristics are widely changed by changing the drawing tension.
  • a method has been proposed in which the change in optical characteristics in the longitudinal direction at the base material stage is reduced by changing the drawing tension using the change in optical characteristics due to the drawing tension (for example, Patent Document 1). , 2).
  • the tension cannot be measured while the good part is manufactured.
  • circularly polarized light is irradiated from the side of the glass fiber 3.
  • the contact tension meter there is a method of measuring the magnitude of the drawing tension generated in the glass fiber 3 from the change in the polarization state, it is more expensive than the contact tension meter and the measurement accuracy is also reduced.
  • the post-coating tension described below is often measured, and the line tension is obtained from this post-coating tension.
  • the tension applied to the optical fiber after the coating is formed includes the coating burden tension generated by the coating apparatus, and it is known that this coating burden tension varies depending on various conditions. For example, if the coating equipment tension, coating material type / temperature, etc. are changed, or the drawing speed is changed, the coating load tension will change greatly. And the correlation of the drawing tension applied to the glass part also changes. For this reason, it is required to directly measure the tensile force applied to the glass part.
  • An object of the present invention is to provide an optical fiber drawing tension measuring method and a drawing tension measuring apparatus capable of measuring force accurately.
  • the method for measuring the drawing tension of an optical fiber includes a method of melt spinning an optical fiber preform, thereby forming a bare optical fiber, and a coating layer made of a resin on an outer periphery of the bare optical fiber And thereby producing an optical fiber, and using a direction changer between the spinning and the formation of the coating layer, the bare optical fiber is floated on the direction changer by a fluid. While changing the direction of the bare optical fiber, detecting the floating position of the bare optical fiber in the direction changer, the preliminary tensile force of the bare optical fiber measured in advance and the bare optical fiber Deriving a drawing tension from the detected value of the floating position based on the correlation with the preliminary floating position.
  • the method of measuring the tensile strength of an optical fiber according to the first aspect includes the preliminary tensile force of the bare optical fiber and the bare optical fiber in order to grasp the correlation before manufacturing the optical fiber. It may further comprise obtaining data of the preliminary floating position of the line.
  • the drawing tension measuring method according to the first aspect measures the outer diameter of the bare optical fiber and corrects the correlation between the preliminary drawing tension and the preliminary floating position based on the measured value of the outer diameter. You may further provide to do.
  • An apparatus for measuring a tensile strength of an optical fiber is a direction changer configured to change the direction of the bare optical fiber while the spun bare optical fiber is floated by a fluid.
  • a position detector configured to detect a floating position of the bare optical fiber in the direction changer; and a main body configured to derive a drawing tension from a detection value of the position detector.
  • the main body derives the drawing tension from the detected value of the floating position based on a correlation between the preliminary measurement of the preliminary drawing tension of the bare optical fiber and the preliminary floating position of the bare optical fiber. Configured as follows.
  • the main body may include data on the preliminary line pulling force of the bare optical fiber and the preliminary floating position of the bare optical fiber.
  • the apparatus for measuring a tensile force of an optical fiber according to the second aspect further includes an outer diameter measuring unit that measures an outer diameter of the bare optical fiber, and the main body is an outer diameter obtained by the outer diameter measuring unit. Based on the measured value of a diameter, you may be comprised so that the correlation with the said preliminary wire pulling force and the said preliminary floating position may be correct
  • the method for measuring the drawing tension of an optical fiber includes a method of melt-spinning an optical fiber preform to thereby form a bare optical fiber, and a coating layer made of resin on the outer periphery of the bare optical fiber And thereby producing an optical fiber, and using a direction changer between the spinning and the formation of the coating layer, the bare optical fiber is floated on the direction changer by a fluid.
  • the flow rate of the fluid in the converter is adjusted, and the drawing tension is derived from the flow rate of the fluid based on the correlation between the preliminary drawing tensile force of the bare optical fiber and the preliminary flow rate of the fluid measured in advance.
  • An apparatus for measuring a drawing tension of an optical fiber is a direction changer configured to change the direction of the bare optical fiber while the spun bare optical fiber is floated by a fluid.
  • a position detector configured to detect a floating position of the bare optical fiber in the direction changer, and adjust a flow rate of the fluid in the direction changer so that the floating position is constant.
  • a main body configured to derive a drawing tension from the flow rate of the fluid. Further, the main body is configured to derive a drawing tension from the flow rate of the fluid based on a correlation between the preliminary drawing tension force of the bare optical fiber and the preliminary flow rate of the fluid that are measured in advance. .
  • the drawing tension is derived from the detected value of the position detection unit based on the correlation between the preliminary drawing tension measured in advance and the preliminary floating position of the bare optical fiber. Since the detection value of the position detection unit is a value corresponding to the flying height of the bare optical fiber, the drawing tension applied to the glass part (bare optical fiber) can be accurately measured. Further, since the drawing tension is derived from the detection value of the position detection unit, the drawing tension can be continuously measured in the length direction of the bare optical fiber in the manufacturing process of the optical fiber. Therefore, when manufacturing conditions are controlled based on this measured value, it is advantageous in terms of quick response. In addition, when a tension abnormality occurs, it becomes easy to identify the cause of the abnormality, so that the repair becomes easy.
  • the tensile force can be measured without contacting the bare optical fiber. Unlike using a contact tension meter, the bare optical fiber is not damaged, and the bare optical fiber is not damaged. There will be no degradation of strength. Therefore, disconnection and yield deterioration due to strength deterioration can be prevented. Further, in this method of measuring the tensile force, there is no disadvantage in manufacturing the optical fiber since the apparatus configuration is not complicated and the manufacturing conditions are not restricted in the manufacturing process of the optical fiber.
  • FIG. 1st direction changer shows the example of a 1st direction changer.
  • 2nd direction changer shows the example of a 3rd direction changer.
  • FIG. 1 is a schematic diagram showing a schematic configuration of an example of an optical fiber manufacturing apparatus for explaining a method for measuring a tensile strength of an optical fiber according to a first embodiment of the present invention.
  • the positional relationship of each component may be expressed based on the drawing direction.
  • the upstream side is the upstream side in the drawing direction
  • the downstream side is the downstream side in the drawing direction.
  • a spinning unit 10 includes a spinning unit 10, a direction changer 20 (20A, 20B, 20C) (non-contact holding mechanism), a tension measuring unit 30, a first coating unit 40, and a first curing unit. 50, a second coating unit 60, a second curing unit 70, a span device 80, and a turn pulley 90.
  • the direction changer and the tension measuring unit may be collectively referred to as a drawing tension measuring device.
  • a winder for winding the optical fiber 5 is provided on the downstream side of the turn pulley 90.
  • the spinning unit 10 includes a heating furnace 11, and the optical fiber preform 2 is heated and melt-spun by the heating furnace 11 to form the bare optical fiber 3.
  • the direction changer 20 changes the direction of the bare optical fiber 3.
  • three direction changers 20 are used. These direction changers 20 are referred to as first to third direction changers 20A to 20C, respectively, from the upstream side to the downstream side in the drawing direction.
  • the first direction changer 20A directs the bare optical fiber 3 drawn vertically downward from the optical fiber preform 2 horizontally by 90 ° direction change.
  • the vertically downward path of the bare optical fiber 3 from the optical fiber preform 2 to the first direction changer 20A is referred to as a first path L1, and the optical fiber from the first direction changer 20A to the second direction changer 20B.
  • the horizontal path of the bare wire 3 is referred to as a second path L2.
  • a surface including the first path L1 and the second path L2 is referred to as P1.
  • the X direction is a direction along the second path L2 in the plane P1
  • the Y direction is a direction perpendicular to the plane P1.
  • the second direction changer 20B directs the bare optical fiber 3 in a direction opposite to the second path L2 by 180 ° direction change.
  • the third direction changer 20C turns the bare optical fiber 3 vertically downward by changing the direction of 90 °.
  • the horizontal path of the bare optical fiber 3 from the second direction changer 20B to the third direction changer 20C is referred to as a third path L3, and the vertically downward optical fiber bare line 3 from the third direction changer 20C.
  • the route is referred to as a fourth route L4.
  • FIG. 3 is a diagram showing the first direction changer 20A (hereinafter, simply referred to as direction changer 20A).
  • the direction changer 20A is circular in plan view, and a guide groove 21 is formed on the outer peripheral surface 20a over the entire circumference.
  • the direction changer 20A has a posture in which the central axis direction (direction perpendicular to the paper surface of FIG. 3) coincides with the Y direction and the radial direction D1 (see FIG. 2) is directed in the direction along the surface P1 (see FIG. 1). Installed at.
  • a direction along the outer peripheral surface 20a is referred to as a circumferential direction.
  • a fluid (for example, air) outlet 22 that floats the bare optical fiber 3 wired along the guide groove 21 is formed along the guide groove 21 at the bottom of the guide groove 21.
  • the blowout port 22 can be formed over the entire length of the guide groove 21 at least in a range through which the bare optical fiber 3 passes.
  • the direction changer 20 ⁇ / b> A can discharge the fluid in the space (fluid reservoir 25) secured inside the direction changer 20 ⁇ / b> A into the guide groove 21 through the outlet 22.
  • the direction changer 20 ⁇ / b> A is connected to an introduction path 26 (see FIG. 3) for introducing fluid from the outside into the fluid reservoir 25.
  • the direction changer 20 ⁇ / b> A can introduce a fluid from the outside into the fluid reservoir 25 through the introduction path 26 and discharge the fluid into the guide groove 21 through the outlet 22.
  • the flow rate of the fluid blown into the guide groove 21 is equal to the flow rate of the fluid introduced into the direction changer 20A.
  • the guide groove 21 is formed to be inclined with respect to the radial direction D1 so that the distance between the inner side surfaces 21c and 21c (dimension in the Y direction) gradually increases toward the outer side in the radial direction. It is preferable.
  • the two inner side surfaces 21c preferably have the same inclination angle ⁇ 1 with respect to the radial direction D1.
  • the bare optical fiber 3 enters the guide groove 21 from the incoming line portion 23 and exits from the guide groove 21 at the outgoing line portion 24. Since the outgoing line portion 24 is located at a position shifted from the incoming line portion 23 in the circumferential direction by about 90 ° in the circumferential direction, the direction of the bare optical fiber 3 is changed by 90 °.
  • FIG. 4 is a diagram showing a second direction changer 20B (hereinafter, simply referred to as a direction changer 20B).
  • the direction changer 20B is circular in plan view, and a guide groove 31 is formed on the outer peripheral surface 20a over the entire circumference.
  • the direction changer 20B can change the direction of the bare optical fiber 3 by 180 °.
  • the direction changer 20B is installed in a posture in which the central axis direction coincides with the Y direction and the radial direction D1 (see FIG. 2) is directed in the direction along the plane P1 (see FIG. 1).
  • a fluid outlet 32 for floating the bare optical fiber 3 is formed along the guide groove 31 at the bottom of the guide groove 31.
  • the blowout port 32 can be formed over the entire length of the guide groove 31 at least in the range through which the bare optical fiber 3 passes.
  • the cross-sectional shape of the guide groove 31 is the same as the cross-sectional shape of the guide groove 21 (see FIG. 2).
  • a structure similar to the structure shown in FIG. 2 can be adopted as the structure for discharging the fluid into the guide groove 31 through the outlet 32.
  • the direction changer 20B can discharge the fluid in the space (fluid reservoir 25) secured in the direction changer 20B into the guide groove 21 through the outlet 32.
  • the direction changer 20 ⁇ / b> B is connected to an introduction path 26 (see FIG. 4) for introducing fluid from the outside into the fluid reservoir 25.
  • the direction changer 20 ⁇ / b> B can introduce a fluid from the outside into the fluid reservoir 25 through the introduction path 26 and discharge the fluid into the guide groove 31 through the outlet 32.
  • the flow rate of the fluid blown out to the guide groove 31 is equal to the flow rate of the fluid introduced into the direction changer 20B.
  • the bare optical fiber 3 enters the guide groove 31 from the incoming line portion 33, and exits from the guide groove 31 at the outgoing line portion 34 at a position shifted by about 180 ° C. in the circumferential direction with respect to the incoming line portion 33.
  • the direction change of 180 ° is performed.
  • FIG. 5 is a diagram showing a third direction changer 20C (hereinafter, simply referred to as a direction changer 20C).
  • the direction changer 20C has the same configuration as the direction changer 20A shown in FIG.
  • the bare optical fiber 3 enters the guide groove 21 from the incoming line portion 43 and exits from the guide groove 21 at the outgoing line portion 44, whereby the direction change of 90 ° is performed.
  • the tension measuring unit 30 includes a position detecting unit 35 that detects the position of the bare optical fiber 3, and a measuring unit main body 36 that measures the drawing tension based on the position of the bare optical fiber 3 detected by the position detecting unit 35. (Main body part).
  • the position detector 35 is provided downstream of the third direction changer 20C and detects the position of the bare optical fiber 3 in the fourth path L4.
  • a laser (optical) position sensor can be used as the position detection unit 35.
  • the laser-type position sensor receives, for example, light emitted from a light source (laser light source) toward the bare optical fiber 3 by a detector installed opposite to the light source, and generates light based on the light. The position of the bare fiber 3 can be detected.
  • the measurement unit main body 36 is based on the correlation between the preliminarily measured drawing tension (preliminary drawing tension) and the position of the bare optical fiber 3 (preliminary floating position).
  • the drawing tension can be measured.
  • the measurement unit main body 36 may include a display unit such as a liquid crystal panel that displays measurement values.
  • the first coating unit 40 applies (coats) a coating material such as urethane acrylate resin to the outer peripheral surface of the bare optical fiber 3 to form a primary coating layer.
  • the coating material used for the primary coating layer is, for example, an ultraviolet curable resin.
  • the first curing unit 50 includes, for example, one or a plurality of UV lamps, and cures the primary coating layer by ultraviolet irradiation.
  • the second coating unit 60 applies a coating material such as urethane acrylate resin to the outer peripheral surface of the primary coating layer to form a secondary coating layer. Thereby, the optical fiber strand intermediate body 4 is obtained.
  • the secondary coating layer preferably has a higher Young's modulus than the primary coating layer.
  • the coating material used for the secondary coating layer is, for example, an ultraviolet curable resin.
  • the second curing unit 70 includes one or a plurality of UV lamps 70a, and cures the secondary coating layer by ultraviolet irradiation. Thereby, the optical fiber 5 is obtained.
  • the second curing unit 70 includes, for example, a plurality of pairs of UV lamps 70a provided across a space through which the optical fiber strand intermediate body 4 passes.
  • the covering material formed on the outer peripheral surface of the bare optical fiber 3 is not limited to a two-layer structure, and may be a one-layer structure or a structure having three or more layers.
  • the span device 80 can twist the optical fiber 5.
  • the turn pulley 90 can take the optical fiber 5 and change the direction of the optical fiber 5 to guide it to a winder (not shown).
  • the method for measuring the tensile strength of the optical fiber according to the first embodiment of the present invention will be described by taking as an example the case where the optical fiber 5 is manufactured using the manufacturing apparatus 1.
  • the optical fiber preform 2 is heated and melt-spun to form a bare optical fiber 3.
  • the bare optical fiber 3 drawn vertically downward (first path L1) from the optical fiber preform 2 is directed horizontally (second path L2) by 90 ° direction change in the first direction changer 20A. It is done.
  • the bare optical fiber 3 is directed in a direction opposite to the second path L2 (third path L3) by the 180 ° direction change in the second direction changer 20B, and 90 ° in the third direction changer 20C. By changing the direction of °, the vertical downward (fourth path L4) is obtained.
  • the bare optical fiber 3 can be floated by discharging the fluid in the fluid reservoir 25 into the guide grooves 21 and 31 through the outlets 22 and 32. More specifically, as shown in FIG. 2, the pressure difference between the deep portion 21d and the shallow portion 21e of the guide groove 21 is increased by the discharged fluid, so that a radially outward force is exerted on the bare optical fiber 3. By acting, the bare optical fiber 3 is levitated.
  • the optical fiber floats by the fluid. If there is a shield in the fluid flow path, the shield receives a force from the fluid.
  • the fluid restricted in the flow path applies a force to the shield while satisfying the momentum conservation law and the energy conservation law.
  • the weight can be stopped at a position where the buoyancy received by the weight from the fluid and the weight load are balanced.
  • the weight load is constant, there is a clear positive correlation between the floating position (more precisely, the flow channel area limited by the flow channel and the weight) and the flow rate. This phenomenon is widely used as the principle of a flow meter.
  • the principle of the flow meter shows that a correlation is created between the floating position of the weight and the weight load when the fluid flow rate is constant. Therefore, it is considered that the weight load can be measured from the floating position by floating the weight in a triangular pyramid-shaped channel through which a constant flow rate of fluid flows. Further, since the above-mentioned correlation occurs in the same manner when the linear body is floated in the guide groove having a V-shaped cross section, a constant flow rate of fluid is caused to flow in the guide groove having the V-shaped cross section, and the linear body is floated there. Thus, it is considered that the load of the striatum can be measured.
  • the optical fiber is regarded as an infinitely long cylinder. be able to. Therefore, it can be said that the optical fiber is a linear body suitable for continuous load measurement. Since the optical fiber has a very small mass, the magnitude of gravity is much smaller than the magnitude of the tensile tension, so the influence of gravity can be ignored. This is also one of the factors suitable for the tension measurement.
  • a coating material such as urethane acrylate resin is applied (coated) to the outer peripheral surface of the bare optical fiber 3 to form a primary coating layer.
  • a primary coating layer is hardened, for example by ultraviolet irradiation by a UV lamp.
  • a coating material such as urethane acrylate resin is applied (coated) to the outer peripheral surface of the primary coating layer to form a secondary coating layer. Thereby, the optical fiber strand intermediate body 4 is obtained.
  • the secondary coating layer is cured by, for example, ultraviolet irradiation with a UV lamp. Thereby, the optical fiber 5 is obtained.
  • the optical fiber 5 can be twisted by the span device 80 as necessary.
  • the optical fiber 5 is taken up by the turn pulley 90 and changed in direction, and taken up by a winder (not shown).
  • the flying height of the bare optical fiber 3 in the direction changer 20 (20A, 20B, 20C) is affected by the force received from the fluid blown out in the guide groove 21 and the drawing tensile force applied to the bare optical fiber 3. receive.
  • the drawing tension is high, the force in the direction in which the bare optical fiber 3 approaches the direction changer 20 ⁇ / b> C increases, so the flying height of the bare optical fiber 3 decreases.
  • the drawing tension applied to the bare optical fiber 3 is low, the force in the direction in which the bare optical fiber 3 approaches the direction changer 20C becomes small. The amount gets bigger.
  • the position in the X direction of the bare optical fiber 3 in the fourth path L4 changes.
  • the flying height of the bare optical fiber 3 in the third direction changer 20C decreases, the bare optical fiber 3 in the fourth path L4 moves in a direction approaching the third direction changer 20C. The position of is on the right side in FIGS. 1 and 5.
  • the flying height of the bare optical fiber 3 increases, the bare optical fiber 3 of the fourth path L4 moves in a direction away from the third direction changer 20C. It is on the left side in FIG.
  • the method of measuring the tensile force of this embodiment uses the fact that the position of the fourth optical path bare wire 3 in the X direction changes as the flying height of the bare optical fiber 3 increases or decreases.
  • the position detection unit 35 can detect the position of the bare optical fiber 3 in the fourth path L4.
  • the position in the X direction of the bare optical fiber 3 in the fourth path L4 is a position corresponding to the flying height of the bare optical fiber 3 in the third direction converter 20C. Therefore, if the position of the bare optical fiber 3 in the fourth path L4 is detected by the position detection unit 35 in the X direction, the flying height (floating position) of the bare optical fiber 3 in the direction changer 20C can be grasped.
  • the position detection unit 35 detects the position of the bare optical fiber 3 in the fourth path L4 in the X direction by a preliminary test.
  • the correlation between the tensile force applied to the bare optical fiber 3 and the position of the fourth optical path bare wire 3 in the X direction is grasped in association with the fluid flow rate in the direction changer 20.
  • FIG. 6 shows the correlation between the drawing tension applied to the bare optical fiber 3 and the X-direction position (relative levitation position) of the bare optical fiber 3 in the fourth path L4. It is an example of the graph arranged in association with the flow rate.
  • the relative levitation position is, for example, a height position in the radial direction from the bottom of the guide groove 21 of the direction changer 20C.
  • a load cell, a contact tension meter, or the like can be used to measure the drawing tension in the preliminary test.
  • 1 gf is about 9.81 ⁇ 10 ⁇ 3 N.
  • the measuring unit main body 36 of the tension measuring unit 30 is preliminarily measured data relating to the correlation between the drawing tension (preliminary drawing tension) and the position of the bare optical fiber 3 (preliminary flying position) (for example, data shown in FIG. 6).
  • the drawing tension is derived from the detection value of the position detection unit 35.
  • the drawing tension can be derived by comparing the detection value of the position detection unit 35 with FIG. Since the detection value of the position detection unit 35 is a value corresponding to the flying height of the bare optical fiber 3, the drawing tension applied to the glass part (bare optical fiber 3) can be accurately measured.
  • the drawing tension is derived from the detection value of the position detector 35, the drawing tension can be continuously measured in the length direction of the bare optical fiber 3 in the manufacturing process of the optical fiber 5. Therefore, when manufacturing conditions are controlled based on this measured value, it is advantageous in terms of quick response. In addition, when a tension abnormality occurs, it becomes easy to identify the cause of the abnormality, so that the repair becomes easy.
  • the drawing tension can be measured without contacting the bare optical fiber 3. Therefore, unlike the case where a contact tension meter is used, the bare optical fiber 3 is not damaged and the strength of the bare optical fiber 3 does not deteriorate. Therefore, disconnection and yield deterioration due to strength deterioration can be prevented. Furthermore, in this method of measuring the tensile strength of the optical fiber, there is no disadvantage in manufacturing the optical fiber 5 because the apparatus configuration is not complicated and manufacturing conditions are not restricted in the manufacturing process of the optical fiber 5.
  • the drawing tension applied to the glass part (bare optical fiber 3) can be kept within a certain range.
  • feedback control such as PID control is preferable.
  • the control target may be a drawing speed, a resin supply pressure in the coating units 40 and 60, an entry speed of the optical fiber preform 2 into the heating furnace 11, and the like.
  • FIG. 7 is a schematic diagram showing a schematic configuration of an example of an optical fiber manufacturing apparatus for explaining an optical fiber drawing tension measuring method according to the second embodiment of the present invention.
  • symbol is attached
  • two direction changers 20 are used. These direction changers 20 are referred to as first and second direction changers 20A and 20D, respectively.
  • the second direction changer 20D turns the bare optical fiber 3 vertically downward by changing the direction by 90 °.
  • the vertically downward path of the bare optical fiber 3 from the second direction changer 20D is referred to as a third path L5.
  • the position detector 35 is provided downstream of the second direction changer 20D and detects the position of the bare optical fiber 3 in the third path L5.
  • the wire tension is determined from the detection value of the position detection unit 35 based on the correlation between the previously measured wire pulling force and the position of the bare optical fiber 3. Can measure force.
  • the drawing tension applied to the glass portion can be accurately measured.
  • the drawing tension can be measured continuously in the length direction of the bare optical fiber 3.
  • the strength of the bare optical fiber 3 is not deteriorated, and disconnection and yield deterioration caused by the strength deterioration can be prevented.
  • the apparatus configuration is not complicated and manufacturing conditions are not restricted, there is no disadvantage in manufacturing the optical fiber 5.
  • FIG. 8 is a schematic view showing a schematic configuration of an example of an optical fiber manufacturing apparatus for explaining an optical fiber drawing tension measuring method according to a third embodiment of the present invention.
  • the outer diameter measurement unit 100 is provided on the downstream side of the position detection unit 35 (between the position detection unit 35 and the first coating unit 40).
  • an optical measuring device including a light source and a detector can be used as the outer diameter measuring unit 100.
  • this measuring apparatus emits light from a light source (laser light source or the like) installed at a side position of the bare optical fiber 3, and receives forward scattered light by a detector installed facing the light source.
  • the outer diameter of the bare optical fiber 3 is measured by analyzing the pattern or strength.
  • a measurement signal from the outer diameter measuring unit 100 is sent to the measuring unit main body 36 of the tension measuring unit 30, and the line tension force and the position of the bare optical fiber 3 are measured.
  • Data relating to the correlation (for example, data shown in FIG. 6) can be corrected.
  • the flying height increases even if the drawing tension is constant.
  • the outer diameter of the bare optical fiber 3 is reduced, the flying height is reduced even if the drawing tension is constant.
  • FIG. 9 is a schematic diagram illustrating a schematic configuration of an example of an apparatus for manufacturing an optical fiber for explaining a method for measuring a tensile strength of an optical fiber according to a fourth embodiment of the present invention.
  • a manufacturing apparatus 1C shown in FIG. 9 is different from the manufacturing apparatus 1 shown in FIG. 1 in that it includes a control unit 110 and a flow rate regulator 120.
  • the control unit 110 uses the flow rate adjuster 120 to control the flow rate of the fluid introduced into the direction changer 20 (for example, the direction changer 20C), thereby changing the direction.
  • the flying height of the bare optical fiber 3 in the vessel 20 can be adjusted.
  • the flow controller 120 a mass flow controller (MFC) or the like can be used.
  • MFC mass flow controller
  • the position detection unit 35 outputs a detection signal to the control unit 110 based on the position information of the bare optical fiber 3 in the fourth path L4.
  • This detection signal is, for example, a signal corresponding to the position of the bare optical fiber 3 in the guide groove 21 in the direction changer 20.
  • the control unit 110 controls the flow rate of the fluid introduced into the direction changer 20 using the flow rate adjuster 120 based on the detection signal. Thereby, in the direction changer 20, the flow rate of the fluid discharged from the outlet 22 to the guide groove 21 can be controlled, and the flying height of the bare optical fiber 3 can be adjusted.
  • the control unit 110 moves to the direction changer 20C.
  • Increase the flow rate of the fluid As a result, in the direction changer 20C, the flow rate of the fluid discharged from the outlet 22 into the guide groove 21 is increased, and the flying height of the bare optical fiber 3 is recovered.
  • the control unit 110 moves to the direction changer 20C. Reduce the flow rate of the fluid.
  • the flow rate of the fluid discharged from the outlet 22 to the guide groove 21 is reduced, and the flying height of the bare optical fiber 3 is suppressed. In this way, the floating position of the bare optical fiber 3 can be kept constant.
  • feedback control such as PID control is employed as the control method, the flow rate of the fluid can be controlled with high responsiveness.
  • the position of the direction is detected by the position detector 35 in advance.
  • the flow rate of the fluid introduced into the direction changer 20 preliminary flow rate
  • the tensile force applied to the bare optical fiber 3 preliminary wire
  • the correlation with (tensile force) can be grasped.
  • the measurement unit main body 36 can measure the linear tensile force from the flow rate of the fluid introduced into the direction changer 20 by using the correlation between the fluid introduction flow rate (preliminary flow rate) and the wire tension force (preliminary wire tension force). it can.
  • the position detection unit 35 is provided on the downstream side of the third direction changer 20C, and in the manufacturing apparatus 1A shown in FIG. 7, the position detection unit 35 is provided on the downstream side of the second direction changer 20D.
  • the position of the position detection unit is not limited to these examples.
  • the position detectors may be provided on one or more downstream sides of the direction changers 20A, 20B, and 20C.
  • the flying height of the bare optical fiber 3 in the direction changer 20A can be detected.
  • the position detector is provided downstream of the direction changer 20B (between the direction changer 20B and the direction changer 20C)
  • the flying height of the bare optical fiber 3 in the direction changer 20B can be detected.
  • the direction change in the direction changer 20 can be performed at any position after the spinning process and before the first coating process.
  • the installation position of the direction changer 20 may be any position as long as it is downstream of the spinning unit 10 and upstream of the first coating unit 40.
  • the number of direction changers 20 may be one or more.
  • Example 1 The manufacturing apparatus 1 shown in FIG. 1 was produced.
  • the floating turning radius of the bare optical fiber 3 in the direction changer 20 (20A, 20B, 20C) was about 62.5 mm.
  • the inclination angle ⁇ of the inner surface 21c of the guide groove 21 of each of the direction changers 20A and 20C with respect to the radial direction R is 0.5 °.
  • the width at the bottom of the guide groove 21 was 50 ⁇ m.
  • the guide groove 31 of the direction changer 20B has the same structure as the guide groove 21.
  • the fluid introduced into the direction changers 20A to 20C was dehumidified air, and the temperature was room temperature (about 24 ° C.).
  • the air introduction flow rate was 100 liters / minute for each of the direction changers 20A and 20C, and 200 liters / minute for the direction changer 20B.
  • the optical fiber preform 2 was melt-spun to obtain a bare optical fiber 3 (outer diameter 125 ⁇ m).
  • An optical fiber bare wire 3 drawn vertically downward (first path L1) from the optical fiber preform 2 is redirected horizontally (second path L2) by the first direction changer 20A, and then the second The direction change by 180 ° in the direction changer 20B is directed in the direction opposite to the second path L2 (third path L3), and the direction downward by 90 ° in the third direction changer 20C (fourth downward) Route L4).
  • a primary coating layer made of an ultraviolet curable resin is formed on the outer peripheral surface of the bare optical fiber 3 by the first coating unit 40, and the primary coating layer is cured by irradiating ultraviolet rays at the first curing unit 50. Then, a secondary coating layer made of an ultraviolet curable resin is formed on the outer peripheral surface of the primary coating layer, and the secondary coating layer is cured by irradiating with ultraviolet rays at the second curing unit 70, and the optical fiber 5 (outer diameter 250 ⁇ m) Got.
  • the optical fiber 5 was wound by a winder (not shown) through the span device 80 and the turn pulley 90. The drawing speed was 1000 m / min.
  • FIG. 6 shows the correlation between the drawing tension applied to the bare optical fiber 3 and the X-direction position (relative levitation position) of the bare optical fiber 3 in the fourth path L4. It is the graph arranged in relation to the flow rate. This graph was created based on data acquired prior to the manufacture of the optical fiber 5.
  • the relative levitation position is a height position in the radial direction from the bottom of the guide groove 21 of the direction changer 20C.
  • the drawing tension applied to the bare optical fiber 3 was derived from the detection value of the position detector 35.
  • the position of the bare optical fiber 3 detected by the position detection unit 35 is 8.2 mm. From FIG. 6, it can be seen that a tension of about 20 gf is applied to the bare optical fiber 3.
  • the optical fiber strand 5 After manufacturing the optical fiber strand 5 having a length of about 600 km under the same conditions, the optical fiber strand 5 was rolled back while applying a load of 1.1% elongation strain, and no disconnection occurred. From this, it was confirmed that the strength deterioration of the bare optical fiber 3 did not occur.
  • DESCRIPTION OF SYMBOLS 1,1A Manufacturing apparatus of optical fiber strand, 2 ... Optical fiber preform, 3 ... Bare optical fiber, 5 ... Optical fiber strand, 10 ... Spinning part, 20, 20A-20D ... Direction changer, 21, DESCRIPTION OF SYMBOLS 31 ... Guide groove, 22, 32 ... Outlet, 30 ... Tension measurement part, 35 ... Position detection part, 36 ... Measurement part main body (main body part), 40 ... 1st coating part, 60 ... 2nd coating part.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

La présente invention concerne un procédé de mesure de tension de ligne d'une fibre optique par l'intermédiaire des étapes suivantes : le filage à l'état fondu d'un matériau de base de fibre optique, moyennant quoi une fibre optique nue est formée ; l'utilisation d'une couche d'enrobage comportant une résine au niveau de la périphérie externe de la fibre optique de base, fabriquant ainsi un brin de fibre optique ; la conversion du sens de la fibre optique nue à l'aide d'un convertisseur directionnel en faisant flotter la fibre optique nue par rapport au convertisseur directionnel durant le procédé de filage jusqu'à la formation de la couche d'enrobage ; la détection de la position de flottaison de la fibre optique nue dans le convertisseur directionnel ; la dérivation d'une tension de ligne à partir de la valeur détectée de la position de flottaison sur la base d'une corrélation entre une tension de ligne préliminaire de la fibre optique nue mesurée à l'avance et une position de flottaison préliminaire de la fibre optique nue.
PCT/JP2016/073289 2015-08-28 2016-08-08 Procédé et dispositif de mesure de la tension de ligne d'une fibre optique WO2017038396A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015169828A JP2017043527A (ja) 2015-08-28 2015-08-28 光ファイバの線引張力測定方法および線引張力測定装置
JP2015-169828 2015-08-28

Publications (1)

Publication Number Publication Date
WO2017038396A1 true WO2017038396A1 (fr) 2017-03-09

Family

ID=58187343

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/073289 WO2017038396A1 (fr) 2015-08-28 2016-08-08 Procédé et dispositif de mesure de la tension de ligne d'une fibre optique

Country Status (2)

Country Link
JP (1) JP2017043527A (fr)
WO (1) WO2017038396A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021019864A1 (fr) * 2019-07-31 2021-02-04 株式会社フジクラ Procédé de fabrication de fibre optique
WO2023167304A1 (fr) * 2022-03-03 2023-09-07 住友電気工業株式会社 Procédé de fabrication de fibre optique et dispositif de fabrication de fibre optique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6887207B2 (ja) * 2018-08-10 2021-06-16 古河電気工業株式会社 光ファイバの製造装置および光ファイバの製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090217710A1 (en) * 2008-02-28 2009-09-03 Costello Iii John Joseph Methods for measuring the tension of optical fibers during manufacture
JP2010510957A (ja) * 2006-11-28 2010-04-08 コーニング インコーポレイテッド 光ファイバの製造方法
JP2011505326A (ja) * 2007-11-29 2011-02-24 コーニング インコーポレイテッド 低減衰ファイバーのためのファイバー・エアターン
JP2016147773A (ja) * 2015-02-10 2016-08-18 株式会社フジクラ 光ファイバ素線の製造方法、制御装置および製造装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010510957A (ja) * 2006-11-28 2010-04-08 コーニング インコーポレイテッド 光ファイバの製造方法
JP2011505326A (ja) * 2007-11-29 2011-02-24 コーニング インコーポレイテッド 低減衰ファイバーのためのファイバー・エアターン
US20090217710A1 (en) * 2008-02-28 2009-09-03 Costello Iii John Joseph Methods for measuring the tension of optical fibers during manufacture
JP2016147773A (ja) * 2015-02-10 2016-08-18 株式会社フジクラ 光ファイバ素線の製造方法、制御装置および製造装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021019864A1 (fr) * 2019-07-31 2021-02-04 株式会社フジクラ Procédé de fabrication de fibre optique
JP2021024748A (ja) * 2019-07-31 2021-02-22 株式会社フジクラ 光ファイバの製造方法
CN113677639A (zh) * 2019-07-31 2021-11-19 株式会社藤仓 光纤的制造方法
JP7155075B2 (ja) 2019-07-31 2022-10-18 株式会社フジクラ 光ファイバの製造方法
CN113677639B (zh) * 2019-07-31 2022-11-18 株式会社藤仓 光纤的制造方法
WO2023167304A1 (fr) * 2022-03-03 2023-09-07 住友電気工業株式会社 Procédé de fabrication de fibre optique et dispositif de fabrication de fibre optique

Also Published As

Publication number Publication date
JP2017043527A (ja) 2017-03-02

Similar Documents

Publication Publication Date Title
JP5917736B1 (ja) 光ファイバ素線の製造方法、制御装置および製造装置
US10023490B2 (en) Method of manufacturing optical fiber, optical fiber manufacturing apparatus, and control apparatus therefor
WO2017038396A1 (fr) Procédé et dispositif de mesure de la tension de ligne d'une fibre optique
US10202301B2 (en) Apparatus for manufacturing an optical fiber
JP6196999B2 (ja) 光ファイバ素線の製造方法、制御装置および製造装置
JP5732586B1 (ja) 光ファイバ素線の製造方法および製造装置
JP6573508B2 (ja) 光ファイバ素線の製造方法および製造装置
WO2021019864A1 (fr) Procédé de fabrication de fibre optique
JP6471044B2 (ja) 光ファイバ素線の製造方法、制御装置および製造装置
JP6335957B2 (ja) 光ファイバ素線の製造方法
JP2005314118A (ja) 線引方法及び線引装置
WO2023190831A1 (fr) Procédé de fabrication d'une fibre optique

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16841428

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16841428

Country of ref document: EP

Kind code of ref document: A1