WO2023277076A1 - 光ファイバ製造装置および光ファイバ製造方法 - Google Patents
光ファイバ製造装置および光ファイバ製造方法 Download PDFInfo
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- WO2023277076A1 WO2023277076A1 PCT/JP2022/025999 JP2022025999W WO2023277076A1 WO 2023277076 A1 WO2023277076 A1 WO 2023277076A1 JP 2022025999 W JP2022025999 W JP 2022025999W WO 2023277076 A1 WO2023277076 A1 WO 2023277076A1
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- WIPO (PCT)
- Prior art keywords
- optical fiber
- moment
- drawing tower
- tower
- fiber preform
- Prior art date
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 192
- 238000007380 fibre production Methods 0.000 title abstract 3
- 238000000034 method Methods 0.000 title description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 claims description 66
- 230000005484 gravity Effects 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 7
- 239000000155 melt Substances 0.000 abstract 1
- 230000008569 process Effects 0.000 description 15
- 238000006073 displacement reaction Methods 0.000 description 12
- 239000000835 fiber Substances 0.000 description 11
- 238000011156 evaluation Methods 0.000 description 10
- 238000005452 bending Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 9
- 238000005491 wire drawing Methods 0.000 description 9
- 238000013459 approach Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012681 fiber drawing Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Images
Classifications
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- 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
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
-
- 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
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/029—Furnaces therefor
-
- 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
Definitions
- the present disclosure relates to an optical fiber manufacturing apparatus and an optical fiber manufacturing method.
- This application claims priority based on Japanese application No. 2021-110795 filed on July 2, 2021, and incorporates all the descriptions described in the Japanese application.
- Patent Document 1 an optical fiber preform and a dummy preform for the optical fiber preform are attached to a drawing tower, and the vibration of the optical fiber preform is activated by controlling a damping device based on the vibration of the dummy preform.
- a damped optical fiber drawing apparatus is disclosed.
- An optical fiber manufacturing apparatus for achieving the above object, a drawing tower, a drawing furnace mounted on the drawing tower for heating and melting an optical fiber preform to spin an optical fiber; an imparting mechanism mounted on the drawing tower for imparting a second moment to the drawing tower in a direction opposite to the acting direction of the first moment imparted to the drawing tower by the optical fiber preform.
- the imparting mechanism can reduce the second moment as the optical fiber preform becomes smaller.
- an optical fiber manufacturing method for achieving the above object, heating and melting an optical fiber preform in a drawing furnace mounted on a drawing tower to spin the optical fiber; A second moment in a direction opposite to the direction of action of the first moment applied to the drawing tower by the optical fiber preform is applied to the drawing tower while decreasing as the optical fiber preform becomes smaller. and a step.
- FIG. 1 is a schematic configuration diagram of an optical fiber manufacturing apparatus according to the first embodiment, showing a state immediately after a drawing process is started.
- FIG. 2 is a schematic configuration diagram of the optical fiber manufacturing apparatus according to the first embodiment, showing a state after a while since the drawing process was started.
- FIG. 3 is a graph showing the relationship between the weight of the optical fiber preform and the magnitude of the first moment.
- FIG. 4 is a schematic configuration diagram of an optical fiber manufacturing apparatus according to the second embodiment.
- the drawing tower may bend due to the weight of the base material, for example. If the draw tower is flexed, there is a risk that the actual running position of the glass fiber will deviate from the intended running position. Therefore, in the manufacture of optical fibers, it is important to suppress the deflection of the drawing tower so that the actual running position and the planned running position do not deviate.
- An object of the present disclosure is to provide an optical fiber manufacturing apparatus and an optical fiber manufacturing method capable of suppressing bending of a drawing tower.
- An optical fiber manufacturing apparatus includes (1) a drawing tower; a drawing furnace mounted on the drawing tower for heating and melting an optical fiber preform to spin an optical fiber; an imparting mechanism mounted on the drawing tower for imparting a second moment to the drawing tower in a direction opposite to the acting direction of the first moment imparted to the drawing tower by the optical fiber preform.
- the imparting mechanism can reduce the second moment as the optical fiber preform becomes smaller.
- the applying mechanism applies the second moment to the drawing tower in a direction opposite to the acting direction of the first moment applied to the drawing tower by the optical fiber preform. Since the imparting mechanism can reduce the second moment as the optical fiber preform becomes smaller, the optical fiber manufacturing apparatus according to the above configuration can suppress the bending of the drawing tower.
- the applying mechanism includes a moving mechanism capable of moving in a predetermined direction and a weight body supported by the moving mechanism;
- the center of gravity of the weight moves toward or away from the center of the drawing tower as the movement mechanism moves.
- the center of gravity of the weight provided in the applying mechanism moves toward or away from the center of the drawing tower as the movement mechanism moves. Therefore, for example, by moving the moving mechanism in accordance with the change in the first moment over time, the movement of the moving mechanism can change the second moment over time.
- the drawing tower has a grounding part that is grounded on the surface on which the drawing tower is arranged;
- the center of gravity of the weight body is located outside the outer periphery of the ground contact portion when viewed from above. According to this configuration, the second moment can be effectively applied to the drawing tower.
- the height of the position where the applying mechanism applies the second moment to the drawing tower is 0.8 times or more the height of the position of the drawing furnace. If the height of the position where the applying mechanism applies the second moment to the drawing tower is less than 0.8 times the height of the position of the drawing furnace, the second moment is effectively applied to the drawing tower. cannot effectively cancel out the first moment from the second moment. Therefore, the height of the position where the applying mechanism applies the second moment to the drawing tower is preferably 0.8 times or more the height of the position of the drawing furnace.
- the height of the drawing furnace is 12 m or more.
- an optical fiber manufacturing method includes: (6) heating and melting the optical fiber preform in a drawing furnace mounted on a drawing tower to spin the optical fiber; A second moment in a direction opposite to the direction of action of the first moment applied to the drawing tower by the optical fiber preform is applied to the drawing tower while decreasing as the optical fiber preform becomes smaller. and a step.
- the second moment in the direction opposite to the direction of action of the first moment applied to the drawing tower by the optical fiber base material is applied to the drawing tower while decreasing as the base material becomes smaller. Therefore, bending of the drawing tower can be suppressed.
- an optical fiber manufacturing method includes: (7) reducing the second moment by moving the center of gravity of the weight toward or away from the center of the draw tower; According to this configuration, the center of gravity of the weight moves toward or away from the center of the drawing tower, so the second moment can be changed over time.
- an optical fiber manufacturing method includes: (8) Move the center of gravity of the weight body outside the outer circumference of the grounding portion of the drawing tower when viewed from above. According to this configuration, the second moment can be effectively applied to the drawing tower.
- an optical fiber manufacturing method includes: (9) Applying the second moment to the drawing tower at a height that is 0.8 times or more the height of the drawing furnace. Effectively imparting the second moment to the drawing tower if the height location where the second moment is imparted to the drawing tower is less than 0.8 times the height of the location of the drawing furnace cannot effectively cancel out the first moment from the second moment. Therefore, it is preferable to apply the second moment to the drawing tower at a height that is at least 0.8 times the height of the drawing furnace.
- an optical fiber manufacturing method includes: (10) Spinning the optical fiber for 1000 km or more per one preform while reducing the second moment.
- FIG. 1 is a schematic configuration diagram illustrating an optical fiber manufacturing apparatus 1. As shown in FIG. FIG. 1 illustrates the state immediately after the wire drawing process is started.
- an optical fiber manufacturing apparatus 1 includes a drawing tower 2, a chuck 3, a control unit 4, a drawing furnace 5, an outer diameter measuring device 8, a forced cooling device 9, a coating It comprises a device 10 , a direct roller 11 , a winding device 12 , a applying mechanism 13 and a capstan device 14 .
- the horizontal direction in FIG. are referred to as Z-axis directions, respectively, and the center position of the drawing tower 2 is defined as the zero point of each axis.
- the optical fiber manufacturing apparatus 1 has a chuck 3 for gripping the support rod 6a of the optical fiber preform 6 on the upper part of the drawing tower 2.
- the chuck 3 is cantilevered on the drawing tower 2 by a chuck support 3a.
- the drawing tower 2 can be placed, for example, inside the building.
- the drawing tower 2 includes a grounding portion 21 that is grounded on the floor surface F of the building (an example of the surface on which the drawing tower 2 is arranged). It is preferable that the drawing tower 2 is independently built on the foundation without being connected to surrounding buildings.
- the chuck 3 is movable in the horizontal direction (X-axis direction, Y-axis direction). Thereby, the chuck 3 can horizontally adjust the position (gripping position) at which the support rod 6a of the optical fiber preform 6 is gripped. Moreover, the chuck supporting portion 3a is slidable in the vertical direction (Z-axis direction) by a slide portion 3b provided on the upper portion of the drawing tower 2 along the vertical direction. As a result, after the support rod 6a is gripped by the chuck 3, the chuck support portion 3a can be slid downward to accommodate the optical fiber preform 6 inside the drawing furnace 5.
- the control unit 4 controls the optical fiber manufacturing apparatus 1. For example, the control unit 4 controls the movement of the chuck 3 in the horizontal direction to horizontally adjust the position (gripping position) at which the support rod 6a of the optical fiber preform 6 is gripped. Also, the control unit 4 measures or calculates the weight of the optical fiber preform 6 . This weight may be measured with a weight scale or calculated from the diameter and length of the optical fiber preform 6 . For example, an operator inputs the numerical values of the diameter and length of the optical fiber preform 6 to be drawn on a touch panel or the like (not shown), or the diameter and length of the optical fiber preform 6 are input by a sensor (not shown). By sensing the length, the controller 4 can calculate the weight of the optical fiber preform 6 . The control unit 4 calculates the moment applied to the drawing tower 2 and the bending amount of the drawing tower 2 based on the calculated weight of the optical fiber preform 6 .
- the drawing furnace 5 is supported on the upper part of the drawing tower 2 .
- the height H of the position of the drawing furnace 5 (that is, the height H from the floor surface F to the center of the drawing furnace 5 (the middle position between the upper end and the lower end of the drawing furnace 5)) is 12 m. That's it.
- the drawing furnace 5 is equipped with a heater, and the heater heats the optical fiber preform 6 accommodated therein. An optical fiber preform 6 heated and melted in a drawing furnace 5 is drawn into an optical fiber 7 with its tip exposed.
- the optical fiber preform 6 is made of, for example, silica-based glass.
- the optical fiber preform 6 has a predetermined weight.
- the outer diameter measuring instrument 8 is, for example, a laser beam type measuring instrument provided below the drawing furnace 5 .
- the outer diameter measuring device 8 measures the outer diameter of the optical fiber 7 .
- the outer diameter measuring device 8 controls driving of, for example, the capstan device 14 so that the outer diameter value of the optical fiber 7 measured by the outer diameter measuring device 8 falls within a predetermined range during wire drawing. A signal is generated and the control signal is sent to the capstan device 14 .
- the forced cooling device 9 has an insertion hole through which the hot optical fiber 7 drawn in the drawing furnace 5 is passed.
- the forced cooling device 9 forcibly cools the optical fiber 7 inserted through the insertion hole by sending cooling gas into the forced cooling device 9 .
- the coating device 10 coats the optical fiber 7 cooled by the forced cooling device 9 with resin. If the resin is an ultraviolet curing resin, an ultraviolet irradiation device may be provided below the coating device 10 to irradiate the optical fiber 7 with ultraviolet rays to cure the resin. After the resin hardens, the optical fiber 7 passes through the roller 11 and the capstan device 14 and is taken up by the take-up device 12 with a constant tension. The capstan device 14 is controlled based on a control signal from the outer diameter measuring device 8, whereby an optical fiber 7 having a predetermined glass outer diameter is obtained.
- the drawing tower 2 bends.
- the chuck 3 and the optical fiber preform 6 tilt toward the lower left in FIG. If the chuck 3 and the optical fiber preform 6 are tilted, the position through which the drawn optical fiber 7 passes deviates from the position of the aligned pass line, and as a result, the optical fiber 7 contacts the forced cooling device 9 or the like. However, disconnection may occur.
- the optical fiber manufacturing apparatus 1 includes the imparting mechanism 13 capable of imparting the second moment M2 to the drawing tower 2 .
- the imparting mechanism 13 is located opposite the optical fiber preform 6 with respect to the center line CR of the drawing tower 2 on the X axis.
- the applying mechanism 13 applies a second moment M2 to the drawing tower 2 in a direction opposite to the acting direction of the first moment M1 applied to the drawing tower 2 by the optical fiber preform 6 .
- the applying mechanism 13 includes a plate-like portion 131 , a moving mechanism 132 and a weight body 133 .
- the plate-like portion 131 is, for example, a substantially rectangular flat plate member extending in the horizontal direction (X-axis direction, Y-axis direction).
- the height h at the position of the plate-like portion 131 (that is, the height h from the floor surface F to the lower end of the plate-like portion 131) is 0.8 times or more the height H at the position of the drawing furnace 5. is preferable.
- the moving mechanism 132 moves on the plate-shaped part 131 in a predetermined direction, for example, in a direction approaching or away from the center of the drawing tower 2 .
- the center of the drawing tower 2 is, for example, the center position P (the position of the zero point described above) of the three axes (X-axis, Y-axis and Z-axis) in the drawing tower 2 .
- the moving mechanism 132 moves in the X-axis direction.
- the moving mechanism 132 is, for example, electrically connected to the controller 4 and moves based on an instruction signal from the controller 4 .
- the movement of the moving mechanism 132 can also be realized by means other than such electrical control.
- the moving mechanism 132 may be moved to a desired position by mechanical control, or may be manually moved to a desired position by an operator. Further, the moving mechanism 132 may always move, or may move intermittently at predetermined time intervals.
- the weight body 133 is, for example, a weight having a predetermined weight.
- the weight of the weight body 133 can be arbitrarily set by the operator.
- the weight body 133 is supported by the moving mechanism 132 . Therefore, when the moving mechanism 132 moves, the weight body 133 moves along with the movement of the moving mechanism 132 . Therefore, the center of gravity 133a of the weight body 133 moves in either direction of the X-axis (horizontal direction in FIG. 1) as the moving mechanism 132 moves. That is, the center of gravity 133a of the weight body 133 moves toward or away from the center (position P) of the drawing tower 2 .
- the center of gravity 133a of the weight body 133 is located outside the outer circumference of the ground contact portion 21 in top view during wire drawing. In other words, the center of gravity 133a of the weight body 133 is located outside the area V inside the drawing tower 2 in top view during the drawing.
- the second moment M2 imparted by the imparting mechanism 13 having such a configuration is controlled by the control unit 4 to obtain a total weight G2 which is the sum of the weight of the moving mechanism 132 and the weight of the weight body 133, and the distance D2 from the center of gravity 133a of the weight to the center line CR of the drawing tower 2 (B is a constant).
- G2 is the sum of the weight of the moving mechanism 132 and the weight of the weight body 133, and the distance D2 from the center of gravity 133a of the weight to the center line CR of the drawing tower 2 (B is a constant).
- FIG. FIG. 2 exemplifies the state when some time has passed since the wire drawing process was started.
- the optical fiber manufacturing method of this embodiment uses the optical fiber manufacturing apparatus 1 illustrated in FIGS. be.
- the chuck supporting portion 3a is slid upward by the sliding portion 3b, and the chuck 3 grips the supporting rod 6a of the optical fiber preform 6 used for drawing. After the support rod 6a is gripped by the chuck 3, the chuck support portion 3a is slid downward, and the optical fiber preform 6 is suspended inside the drawing furnace 5 and accommodated.
- An optical fiber preform 6 housed inside a drawing furnace 5 is heated by a heater.
- the tip of the optical fiber preform 6 is heated to a predetermined temperature (for example, 2000° C.) to melt the optical fiber preform 6, and the glass block at the tip is pulled down to extract the lead. Subsequently, drawing is performed while reducing the diameter of the glass. As the drawing progresses, the optical fiber 7 is drawn from the tip of the optical fiber preform 6 by gradually sliding the chuck supporting portion 3a downward.
- the positions of the chuck 3 and the direct-lower roller 11, the central axes of the drawing furnace 5, the forced cooling device 9, the coating device 10, etc. are aligned in advance before drawing, and the drawn optical fiber 7 is It is necessary to align the path lines to be passed. This alignment of the pass lines is normally performed in a state in which the optical fiber preform 6 is not suspended.
- the optical fiber preform 6 becomes smaller as the drawing progresses, so the weight of the optical fiber preform 6 decreases as the drawing progresses.
- the weight of the optical fiber preform 6 and the magnitude of the first moment M1 are in a linearly proportional relationship. Therefore, the first moment M1 decreases as the drawing progresses. Therefore, in order to suppress the bending of the drawing tower 2, the inventor applies the second moment M2 according to the first moment M1, and changes the second moment M2 according to the change of the first moment M1. I noticed a good thing.
- the inventor got the idea of moving the moving mechanism 132 that supports the weight body 133 to reduce the second moment M2 in accordance with the weight reduction of the optical fiber preform 6 .
- the control unit 4 calculates the first moment M1, calculates the distance D2 where the first moment M1 and the second moment M2 are equal, and moves the moving mechanism 132 to the position corresponding to the distance D2. move.
- the control unit 4 calculates the first moment m1.
- the control unit 4 calculates the first moment m1, calculates the distance d2 where the first moment m1 and the second moment m2 are equal, and moves the moving mechanism 132 to the position corresponding to the distance d2.
- the second moment m2 is calculated from the total weight G2, which is the sum of the weight of the moving mechanism 132 and the weight body 133, and the center of gravity 133a of the combined weight body of the moving mechanism 132 and the weight body 133. and the distance d2 to the center line CR of , based on the equation (4).
- m2 G2*d2+B Expression (4)
- the moving mechanism 132 approaches the center (position P) of the drawing tower 2 .
- the imparting mechanism 13 can reduce the second moment M2 as the weight of the optical fiber preform 6 decreases.
- the imparting mechanism 13 may continuously reduce the second moment M2, or may intermittently reduce the second moment M2 at predetermined time intervals. This control is continued until the entire effective portion of the optical fiber preform 6 is drawn.
- the drawing progresses further and all the effective portions of the optical fiber preform 6 are drawn, the drawing ends.
- a large optical fiber preform 6 is used, and the optical fiber 7 is spun for 1000 km or more per optical fiber preform 6 .
- the imparting mechanism 13 applies the second moments M2, m2 in the direction opposite to the acting direction of the first moments M1, m1. , to the draw tower 2 . Further, the imparting mechanism 13 reduces the second moment M2 as the optical fiber preform 6 becomes smaller. Therefore, according to the optical fiber manufacturing apparatus 1 and the optical fiber manufacturing method according to the present embodiment, bending of the drawing tower 2 can be suppressed.
- the center of gravity 133a approaches the center (position P) of the drawing tower 2 as the moving mechanism 132 moves, so the second moment M2 can be decreased over time by moving the moving mechanism 132. can be done.
- the center of gravity 133a When the center of gravity 133a is positioned inside the outer circumference of the ground contact portion 21 in top view, the distance from the weight body 133 to the center line CR cannot be secured. cannot be given. However, in this embodiment, the center of gravity 133a of the weight body 133 is positioned outside the outer circumference of the ground contact portion 21 when viewed from above. Therefore, according to the optical fiber manufacturing apparatus 1 and the optical fiber manufacturing method according to the present embodiment, the second moments M2 and m2 can be effectively applied to the drawing tower 2 .
- optical fiber manufacturing apparatus 1A Next, an optical fiber manufacturing apparatus 1A according to this embodiment will be described with reference to FIG.
- the same components as those of the optical fiber manufacturing apparatus 1 according to the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.
- FIG. 4 is a schematic configuration diagram of the optical fiber manufacturing apparatus 1A.
- the optical fiber manufacturing apparatus 1A includes a chuck 30, a drawing furnace 50, an outer diameter measuring device 80, a forced cooling device 90, a coating device 100, a direct roller 110, a winding device 120, and a capstan device 140. and are further provided, which is different from the optical fiber manufacturing apparatus 1 . Further, the optical fiber manufacturing apparatus 1A is capable of moving the weight member 133 not only to the right side of the drawing tower 2 in FIG. Differs from device 1. Thus, the optical fiber manufacturing apparatus 1A is an optical fiber manufacturing apparatus having two drawing lines for one drawing tower.
- control unit 4 controls the horizontal movement of the chuck 30 to horizontally adjust the position (gripping position) at which the support rod 60a of the optical fiber preform 60 is gripped.
- the controller 4 also measures or calculates the weight of the optical fiber preform 60 .
- the chuck 30 may have the same configuration as the chuck 3. Also, the configuration from the wire drawing furnace 50 to the capstan device 140 may be the same configuration as the configuration from the wire drawing furnace 5 to the capstan device 14 . However, it is assumed that the weight G3 of the optical fiber preform 60 is smaller than the weight G1 of the optical fiber preform 6 in the state shown in FIG.
- the chuck 30 includes a chuck support portion 30a having the same configuration as the chuck support portion 3a, and a slide portion 30b having the same configuration as the slide portion 3b.
- the chuck 30 grips a support rod 60a of an optical fiber preform 60 having the same structure as the optical fiber preform 6.
- the drawing tower 2 exerts a first force in a direction opposite to the acting direction of the first moment M1.
- Three moments M3 are applied.
- the third moment M3 is calculated based on the following equation (5) using the weight G3 of the optical fiber preform 60 and the distance D3 from the optical fiber preform 60 to the center line CR of the drawing tower 2. (C is a constant).
- M3 G3*D3+C Expression (5)
- the third moment M3 is smaller than the first moment M1. Therefore, also in this embodiment, the chuck 3 and the optical fiber preform 6 are tilted in the lower left direction in FIG. 1, and as a result, the drawing tower 2 is bent.
- the control unit 4 calculates a distance D4 that satisfies the following formula (6), and moves the moving mechanism 132 of the imparting mechanism 13 to a position corresponding to the distance D4.
- the distance D4 is the distance from the center of the weight (the center of gravity 133a) of the combination of the moving mechanism 132 and the weight body 133 to the center line CR of the drawing tower 2.
- the moving mechanism 132 moves to the position corresponding to the distance D4
- the first moment M1 becomes equal to the sum of the second moment M2 and the third moment M3, so the bending amount of the drawing tower 2 can be made substantially zero. can.
- the present disclosure is applied to the optical fiber manufacturing apparatus 1A having two drawing lines for one drawing tower, the same effect as the first embodiment can be obtained.
- the optical fiber 7 is spun using the optical fiber manufacturing apparatus 1 according to the present embodiment, and the positional deviation of the drawing furnace 5 and the positional deviation of the pass line at the start and end of drawing are measured. , disconnection frequency, and .
- Tables 1 and 2 show the positional deviation of the drawing furnace 5 and the positional deviation of the pass line at the start and end of drawing under various conditions, and the wire breakage frequency.
- the positional deviation of the drawing furnace 5 at the start and end of drawing is good when the deviation is 3.0 mm or less, and is unsatisfactory when it exceeds 3.0 mm. Therefore, the good range of the amount of positional deviation of the drawing furnace 5 is 3.0 mm or less.
- the misalignment of the pass line at the start and end of drawing is good when the amount of misalignment is 0.3 mm or less, and is bad when it exceeds 0.3 mm. Therefore, the good range of the positional deviation amount of the pass line is 0.3 mm or less.
- the disconnection frequency is good when it is 0.1/1000 km or less, and is bad when it exceeds 0.1/1000 km. Therefore, the good range of disconnection frequency is 0.1 cases/1000 km or less.
- these are comprehensively judged and expressed in three grades of A, B, and C.
- A indicates good
- B indicates relatively good
- C indicates bad.
- the initial position of the moving mechanism 132 is the distance D2 from the center of gravity 133a to the center line CR of the drawing tower 2
- the final position of the moving mechanism 132 is the distance from the center of gravity 133a to the center line CR of the drawing tower 2.
- d2 Also, the fiber length is the length of the optical fiber 7 spun from one optical fiber preform 6 .
- Experimental Examples 1 and 2 will be explained.
- the distance D2 at the start of drawing and the distance d2 at the end of drawing are both 750 mm. That is, in Experimental Example 1, the moving mechanism 132 was not moved during the drawing process.
- the distance D2 at the start of drawing is 1304 mm, but the distance d2 at the end of drawing is 754 mm. That is, in Experimental Example 2, the moving mechanism 132 is moved so as to approach the center (position P) of the drawing tower 2 during the drawing process.
- Other parameters in Experimental Example 1 and Experimental Example 2 are the same.
- Experimental Example 8 in which only the initial position of the moving mechanism 132 and the final position of the moving mechanism 132 differ from Experimental Example 7, and Experimental Example 9 in which only the initial position of the moving mechanism 132 and the final position of the moving mechanism 132 differ from Experimental Example 9.
- the positional deviation of the drawing furnace 5 and the positional deviation of the pass line at the start and end of drawing, and the wire breakage frequency were all within the good range, so the evaluation was given as A.
- the optical fiber manufacturing apparatus 1A is configured to include only the control unit 4, but may further include a control unit 40 having the same hardware configuration as the control unit 4.
- the center of gravity 133a approaches the center (position P) of the drawing tower 2 as the movement mechanism 132 moves, but it may move away from the center of the drawing tower 2.
- the center of gravity 133a it is preferable to move the center of gravity 133a away from the center of the drawing tower 2.
- the movement mechanism 132 moves in the X-axis direction, but may also move in the Y-axis direction or the Z-axis direction.
- the imparting mechanism 13 controls the second moment by moving the moving mechanism 132, but the second moment may be controlled by changing the weight of the imparting mechanism 13. good.
- the weight of the applying mechanism 13 may be changed by putting a liquid or the like in a container provided with the applying mechanism 13 and gradually discharging the liquid from the container as the wire drawing progresses.
- Optical fiber manufacturing device 2 Drawing towers 3, 30: Chucks 3a, 30a: Chuck supporting parts 3b, 30b: Slide parts 4, 40: Control parts 5, 50: Drawing furnaces 6, 60: Optical fibers Base material 6a, 60a: Support rod 7: Optical fiber 8, 80: Outer diameter measuring device 9, 90: Forced cooling device 10, 100: Coating device 11, 110: Directly below roller 12, 120: Winding device 13: Giving mechanism 14, 140: Capstan device 21: Ground part 131: Plate-like part 132: Moving mechanism 133: Weight body 133a: Center of gravity CR: Center lines D1, D2, D3, d2: Distance F: Floor surface H, h: Height M1, m1: first moment M2, m2: second moment M3: third moment P: position V: area
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Abstract
Description
本出願は、2021年7月2日出願の日本出願第2021-110795号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。
線引タワーと、
前記線引タワーに搭載され、光ファイバ母材を加熱し溶融させて光ファイバを紡糸するための線引炉と、
前記線引タワーに搭載され、前記光ファイバ母材により前記線引タワーに付与される第一モーメントの作用方向とは反対向きの第二モーメントを前記線引タワーに付与する付与機構と、を備え、
前記付与機構は、前記光ファイバ母材が小さくなるにつれて、前記第二モーメントを減少させることができる。
線引タワーに搭載された線引炉で光ファイバ母材を加熱して溶融させ光ファイバを紡糸するステップと、
前記光ファイバ母材により前記線引タワーに付与される第一モーメントの作用方向とは反対向きの第二モーメントを、前記光ファイバ母材が小さくなるにつれて減少させながら、前記線引タワーに付与するステップと、を含む。
ところで、線引タワーは、例えば母材の重量等により撓むことがある。線引タワーが撓むと、ガラスファイバの実際の走行位置と予定された走行位置とがずれてしまう虞がある。したがって、光ファイバの製造においては、実際の走行位置と予定された走行位置とがずれないように、線引タワーの撓みを抑制することが重要である。
本開示によれば、線引タワーの撓みを抑制することが可能な光ファイバ製造装置および光ファイバ製造方法を提供することができる。
最初に本開示の実施態様を列記して説明する。
本開示の一態様に係る光ファイバ製造装置は、
(1) 線引タワーと、
前記線引タワーに搭載され、光ファイバ母材を加熱し溶融させて光ファイバを紡糸するための線引炉と、
前記線引タワーに搭載され、前記光ファイバ母材により前記線引タワーに付与される第一モーメントの作用方向とは反対向きの第二モーメントを前記線引タワーに付与する付与機構と、を備え、
前記付与機構は、前記光ファイバ母材が小さくなるにつれて、前記第二モーメントを減少させることができる。
この構成によれば、付与機構は、光ファイバ母材により線引タワーに付与される第一モーメントの作用方向とは反対向きの第二モーメントを、線引タワーに対して付与する。そして、付与機構は、光ファイバ母材が小さくなるにつれて、第二モーメントを減少させることができるので、上記構成に係る光ファイバ製造装置によれば、線引タワーの撓みを抑制することができる。
(2) 前記付与機構は、所定の方向に移動可能な移動機構と、前記移動機構に支持された重量体と、を備え、
前記重量体の重心が、前記移動機構の移動に伴い、前記線引タワーの中心に近づく、もしくは離れる方向に移動する。
この構成によれば、付与機構に備わる重量体の重心は、移動機構の移動に伴い、線引タワーの中心に近づく、もしくは離れる方向に移動する。したがって、例えば第一モーメントの経時的変化に応じて移動機構を移動させることで、第二モーメントを、移動機構の移動により、経時的に変化させることができる。
(3) 前記線引タワーは、前記線引タワーが配置される面に接地する接地部を備えており、
前記重量体の重心は、上面視で前記接地部の外周より外側に位置している。
この構成によれば、線引タワーに対して効果的に第二モーメントを付与することができる。
(4) 前記線引タワーに対して前記付与機構が前記第二モーメントを付与する位置の高さは、前記線引炉の位置の高さの0.8倍以上である。
線引タワーに対して付与機構が第二モーメントを付与する位置の高さが線引炉の位置の高さの0.8倍未満である場合、線引タワーに対して第二モーメントを効果的に付与することができないため、第二モーメントより第一モーメントを効果的に相殺できない。したがって、線引タワーに対して付与機構が第二モーメントを付与する位置の高さは、線引炉の位置の高さの0.8倍以上であると好適である。
(5) 前記線引炉の位置の高さは12m以上である。
線引炉の位置の高さが高いほど、第一モーメントが大きくなるため、線引タワーに対して第二モーメントを付与する効果が高くなり、特に線引炉の位置の高さが12m以上である場合、本開示は好適である。
(6) 線引タワーに搭載された線引炉で光ファイバ母材を加熱して溶融させ光ファイバを紡糸するステップと、
前記光ファイバ母材により前記線引タワーに付与される第一モーメントの作用方向とは反対向きの第二モーメントを、前記光ファイバ母材が小さくなるにつれて減少させながら、前記線引タワーに付与するステップと、を含む。
この構成によれば、光ファイバ母材により線引タワーに付与される第一モーメントの作用方向とは反対向きの第二モーメントを、母材が小さくなるにつれて減少させながら、線引タワーに付与するため、線引タワーの撓みを抑制することができる。
(7) 重量体の重心を前記線引タワーの中心に近づく、もしくは離れる方向に移動させることで、前記第二モーメントを減少させる。
この構成によれば、重量体の重心は、線引タワーの中心に近づく、もしくは離れる方向に移動するので、第二モーメントを経時的に変化させることができる。
(8) 上面視において、前記線引タワーの接地部の外周より外側で前記重量体の重心を移動させる。
この構成によれば、線引タワーに対して効果的に第二モーメントを付与することができる。
(9) 前記線引炉の位置の高さの0.8倍以上の高さの位置で、前記線引タワーに対して前記第二モーメントを付与する。
線引タワーに対して第二モーメントが付与される高さの位置が線引炉の位置の高さの0.8倍未満である場合、線引タワーに対して第二モーメントを効果的に付与することができないため、第二モーメントより第一モーメントを効果的に相殺できない。したがって、線引炉の位置の高さの0.8倍以上の高さの位置で、線引タワーに対して第二モーメントを付与すると好適である。
(10) 前記第二モーメントを減少させながら、一つの母材につき前記光ファイバを1000km以上紡糸する。
紡糸される光ファイバのファイバ長が長いほど、光ファイバ母材が大型化し、第一モーメントは大きくなる。したがって、紡糸される光ファイバのファイバ長が長いほど、線引タワーに対して第二モーメントを付与する必要性が高く、特に1000km以上のファイバ長の光ファイバを紡糸する場合、本開示は好適である。
本開示の実施形態に係る光ファイバ製造装置の具体例を、以下に図面を参照して説明する。なお、本開示はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。
図1を参照しつつ、本実施形態に係る光ファイバ製造装置1について説明する。図1は、光ファイバ製造装置1を例示する概略構成図である。図1は線引工程が開始された直後の様子を例示している。
チャック支持部3aをスライド部3bによって上方にスライドさせ、線引きに使用する光ファイバ母材6の支持棒6aをチャック3に把持させる。支持棒6aをチャック3に把持させた後、チャック支持部3aを下方にスライドさせ、光ファイバ母材6を線引炉5の内部に吊るして収容する。
線引炉5の内部に収容した光ファイバ母材6をヒーターによって加熱する。光ファイバ母材6の先端を所定の温度(例えば、2000℃)に加熱することにより光ファイバ母材6を溶融させて、先端部のガラス塊を引き落とすことにより口出しを行う。引き続いてガラスの径を細くしながら線引きを行う。そして、線引きの進行に伴い、チャック支持部3aを下方に徐々にスライドさせることにより、光ファイバ母材6の先端から光ファイバ7が線引きされていく。
次に、図4を参照しつつ、本実施形態に係る光ファイバ製造装置1Aについて説明する。なお、光ファイバ製造装置1Aの説明において、第一実施形態に係る光ファイバ製造装置1と同様の構成については同じ符号を付して説明し、その説明は適宜省略する。
2:線引タワー
3,30:チャック
3a,30a:チャック支持部
3b,30b:スライド部
4,40:制御部
5,50:線引炉
6,60:光ファイバ母材
6a,60a:支持棒
7:光ファイバ
8,80:外径測定器
9,90:強制冷却装置
10,100:被覆装置
11,110:直下ローラ
12,120:巻取り装置
13:付与機構
14,140:キャプスタン装置
21:接地部
131:板状部
132:移動機構
133:重量体
133a:重心
CR:中心線
D1,D2,D3,d2:距離
F:床面
H,h:高さ
M1,m1:第一モーメント
M2,m2:第二モーメント
M3:第三モーメント
P:位置
V:領域
Claims (10)
- 線引タワーと、
前記線引タワーに搭載され、光ファイバ母材を加熱し溶融させて光ファイバを紡糸するための線引炉と、
前記線引タワーに搭載され、前記光ファイバ母材により前記線引タワーに付与される第一モーメントの作用方向とは反対向きの第二モーメントを前記線引タワーに付与する付与機構と、を備え、
前記付与機構は、前記光ファイバ母材が小さくなるにつれて、前記第二モーメントを減少させることができる、光ファイバ製造装置。 - 前記付与機構は、所定の方向に移動可能な移動機構と、前記移動機構に支持された重量体と、を備え、
前記重量体の重心が、前記移動機構の移動に伴い、前記線引タワーの中心に近づく、もしくは離れる方向に移動する、請求項1に記載の光ファイバ製造装置。 - 前記線引タワーは、前記線引タワーが配置される面に接地する接地部を備えており、
前記重量体の重心は、上面視で前記接地部の外周より外側に位置する、請求項2に記載の光ファイバ製造装置。 - 前記線引タワーに対して前記付与機構が前記第二モーメントを付与する位置の高さは、前記線引炉の位置の高さの0.8倍以上である、請求項1から請求項3のいずれか一項に記載の光ファイバ製造装置。
- 前記線引炉の位置の高さは12m以上である、請求項1から請求項4のいずれか一項に記載の光ファイバ製造装置。
- 線引タワーに搭載された線引炉で光ファイバ母材を加熱して溶融させ光ファイバを紡糸するステップと、
前記光ファイバ母材により前記線引タワーに付与される第一モーメントの作用方向とは反対向きの第二モーメントを、前記光ファイバ母材が小さくなるにつれて減少させながら、前記線引タワーに付与するステップと、を含む、光ファイバ製造方法。 - 重量体の重心を前記線引タワーの中心に近づく、もしくは離れる方向に移動させることで、前記第二モーメントを減少させる、請求項6に記載の光ファイバ製造方法。
- 上面視において、前記線引タワーの接地部の外周より外側で前記重量体の重心を移動させる、請求項7に記載の光ファイバ製造方法。
- 前記線引炉の位置の高さの0.8倍以上の高さの位置で、前記線引タワーに対して前記第二モーメントを付与する、請求項6から請求項8のいずれか一項に記載の光ファイバ製造方法。
- 前記第二モーメントを減少させながら、一つの光ファイバ母材につき前記光ファイバを1000km以上紡糸する、請求項6から請求項9のいずれか一項に記載の光ファイバ製造方法。
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JP2013220972A (ja) * | 2012-04-17 | 2013-10-28 | Sumitomo Electric Ind Ltd | 光ファイバの製造方法 |
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JP2017088471A (ja) * | 2015-11-17 | 2017-05-25 | 住友電気工業株式会社 | 光ファイバ製造装置、光ファイバ製造方法 |
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JPS6071538A (ja) * | 1983-09-03 | 1985-04-23 | エステイ−シ− ピ−エルシ− | 光フアイバ引出し塔 |
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JP2017088471A (ja) * | 2015-11-17 | 2017-05-25 | 住友電気工業株式会社 | 光ファイバ製造装置、光ファイバ製造方法 |
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