WO2023090359A1 - ロッド挿入治具及びマルチコア光ファイバ母材の製造方法 - Google Patents
ロッド挿入治具及びマルチコア光ファイバ母材の製造方法 Download PDFInfo
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- WO2023090359A1 WO2023090359A1 PCT/JP2022/042548 JP2022042548W WO2023090359A1 WO 2023090359 A1 WO2023090359 A1 WO 2023090359A1 JP 2022042548 W JP2022042548 W JP 2022042548W WO 2023090359 A1 WO2023090359 A1 WO 2023090359A1
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- Prior art keywords
- rod
- glass
- hole
- base material
- insertion jig
- Prior art date
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- 239000000463 material Substances 0.000 title claims abstract description 96
- 238000003780 insertion Methods 0.000 title claims abstract description 90
- 230000037431 insertion Effects 0.000 title claims abstract description 90
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 239000013307 optical fiber Substances 0.000 title claims description 11
- 239000011521 glass Substances 0.000 claims abstract description 195
- 238000005253 cladding Methods 0.000 claims abstract description 9
- 230000000149 penetrating effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 17
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000011162 core material Substances 0.000 description 140
- 238000005530 etching Methods 0.000 description 15
- 230000010354 integration Effects 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- 238000012986 modification Methods 0.000 description 9
- 230000004048 modification Effects 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 238000005520 cutting process Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011109 contamination Methods 0.000 description 2
- 229920006015 heat resistant resin Polymers 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
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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
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
Definitions
- the present disclosure relates to a rod insertion jig and a method of manufacturing a multi-core optical fiber preform.
- the present disclosure relates to optical fibers and methods of making optical fibers.
- Patent Document 1 a process of inserting a plurality of core materials into a plurality of holes provided in a clad material, inserting pieces into glass pipes connected to both ends of the clad material, and sandwiching the core material with the pieces
- a method for manufacturing a multi-core optical fiber (MCF) preform is disclosed, which includes the steps of fixing and heating and integrating the core material and the clad material.
- a rod insertion jig inserts a glass rod into a hole penetrating a clad base material.
- the clad base material is a columnar member having a first end and a second end facing each other. It has a first hole which is a hole extending along the central axis to the end.
- a first glass tube is connected to the first end of the clad base material.
- a second glass tube is connected to the second end of the clad base material.
- the first glass rod which is a glass rod inserted into the first hole, is a rod-shaped member whose axial direction is the first direction.
- the rod insertion jig includes a support portion installed in contact with the inner surface of the first glass tube, a first holding portion supported by the support portion inside the first glass tube, and a first glass rod for moving. and a first moving part, which is a member.
- the first holding part has a first mounting surface on which the first glass rod is mounted along the first direction.
- the support portion supports the first holding portion such that the entire first glass rod placed on the first placement surface overlaps the first hole when viewed from the first direction.
- the first moving part moves the first glass rod placed on the first placement surface in the first direction.
- FIG. 1 is a cross-sectional view of an MCF base material manufactured using the rod insertion jig of the embodiment.
- FIG. 2 is a flow chart showing a method for manufacturing an MCF base material according to the embodiment.
- FIG. 3 is a perspective view of a clad base material to which a glass tube is connected.
- FIG. 4 is a cross-sectional view of the clad base material.
- FIG. 5 is a cross-sectional view for explaining the insertion step.
- FIG. 6 is a perspective view showing a rod insertion jig according to the embodiment;
- FIG. 7 is a cross-sectional view along line VII-VII of FIG.
- FIG. 8 is a cross-sectional view for explaining the integration process.
- FIG. 9 is a cross-sectional view for explaining an insertion step using the rod insertion jig according to the first modified example.
- FIG. 10 is a cross-sectional view for explaining the insertion process using the rod insertion jig
- the core material Since glass pipes are connected to both ends of the clad base material, the core material is typically inserted into a hole having a diameter of about 10 mm located about 1000 mm ahead. Moreover, since the hole is not on the central axis of the clad material, it is not easy to insert the core material. Even if it can be inserted, if the direction of insertion deviates from the axial direction of the hole, the core material and the inner wall of the hole will be damaged due to friction. Such scratches may form air bubbles in the optical fiber and reduce the yield.
- An object of the present disclosure is to provide a rod insertion jig capable of inserting a glass rod into a hole of a clad base material and a method for manufacturing an MCF base material while suppressing scratches and inclusion of foreign matter.
- a rod insertion jig inserts a glass rod into a hole penetrating a clad base material.
- the clad base material is a columnar member having a first end and a second end facing each other. It has a first hole which is a hole extending along the central axis to the end.
- a first glass tube is connected to the first end of the clad base material.
- a second glass tube is connected to the second end of the clad base material.
- the first glass rod which is a glass rod inserted into the first hole, is a rod-shaped member whose axial direction is the first direction.
- the rod insertion jig includes a support portion installed in contact with the inner surface of the first glass tube, a first holding portion supported by the support portion inside the first glass tube, and a first glass rod for moving. and a first moving part, which is a member.
- the first holding part has a first mounting surface on which the first glass rod is mounted along the first direction.
- the support portion supports the first holding portion such that the entire first glass rod placed on the first placement surface overlaps the first hole when viewed from the first direction.
- the first moving part moves the first glass rod placed on the first placement surface in the first direction.
- the first glass rod is held by the first holding portion and inserted into the first glass tube. It can be transported close to the material. Therefore, it is possible to insert the first glass rod into the first hole while suppressing foreign matter from entering due to cutting and reconnection of the first glass tube.
- the first glass rod is placed on the first mounting surface of the first holder and guided in the first direction by the first mounting surface. Therefore, the first moving part can move the first glass rod along the first placement surface in the first direction.
- the supporting portion it is possible to appropriately adjust the insertion position and the insertion direction of the first glass rod with respect to the first hole. Therefore, the first glass rod can be inserted into the first hole while suppressing damage to the first glass rod and the inner wall of the first hole.
- the clad base material may further have a second hole that is different from the first hole.
- the second glass rod which is a glass rod inserted into the second hole, may be a rod-shaped member whose axial direction is the second direction.
- the rod insertion jig may further include a second holding portion supported by the support portion inside the first glass tube, and a second moving portion which is a member for moving the second glass rod.
- the second holding part may have a second mounting surface on which the second glass rod is mounted along the second direction.
- the supporting portion may support the second holding portion such that the entire second glass rod placed on the second placing surface overlaps the second hole when viewed from the second direction.
- the second moving part may move the second glass rod placed on the second placement surface in the second direction.
- the second glass rod is held by the second holding portion and inserted into the first glass tube, so that the second glass rod can be brought near the clad base material without cutting the first glass tube. can be placed. Therefore, it is possible to insert the second glass rod into the second hole while suppressing foreign matter from entering due to cutting and reconnection of the first glass tube.
- the second glass rod is placed on the second mounting surface of the second holding part and guided in the second direction by the second mounting surface. Therefore, the second moving part can move the second glass rod along the second mounting surface in the second direction.
- the supporting portion it is possible to appropriately adjust the insertion position and the insertion direction of the second glass rod with respect to the second hole. Therefore, the second glass rod can be inserted into the second hole while suppressing damage to the second glass rod and the inner wall of the second hole. Moreover, since the first glass rod and the second glass rod can be inserted at the same time, the manufacturing time can be shortened.
- the second moving part may be the same member as the first moving part.
- the first glass rod and the second glass rod can be moved sequentially.
- the second moving part may be a member different from the first moving part.
- the first glass rod and the second glass rod can be moved simultaneously.
- the support portion may include a first support member and a second support member separated from each other in the longitudinal direction of the first holding portion. In this case, the first holding portion can be stably supported.
- the first mounting surface may be a curved surface along the outer peripheral surface of the glass rod when viewed from the longitudinal direction of the first holding portion. In this case, it is easy to guide the first glass rod in the first direction.
- the longitudinal length of the first holding part may be longer than the longitudinal length of the first glass tube. In this case, it is easy to insert the first glass rod into the first hole.
- the length in the longitudinal direction of the first moving part may be longer than the length in the longitudinal direction of the first holding part.
- the first moving part can apply a pushing force to the first glass rod from one end to the other end of the first holding part.
- the first holding portion may be arranged such that the tip of the first holding portion is separated from the first end of the clad base material. In this case, scratches and contamination of foreign matter can be suppressed.
- a method for manufacturing an MCF base material includes a clad base having a first glass tube connected to a first end and a hole penetrating in a direction along the central axis at a position deviated from the central axis. preparing a material; preparing a glass rod; inserting the glass rod into the hole using the rod insertion jig; and integrating.
- the rod insertion jig is used, it is possible to insert the glass rod into the hole of the clad base material while suppressing scratches and inclusion of foreign matter.
- FIG. 1 is a cross-sectional view of an MCF base material manufactured using the rod insertion jig of the embodiment. In this figure, a cross section perpendicular to the central axis A1 of the MCF base material 1 is shown.
- the MCF base material 1 includes multiple core portions 2 and a common clad portion 3 . In this embodiment, the number of core portions 2 is two.
- the core portion 2 extends along the central axis A1.
- the plurality of core portions 2 are arranged at positions offset from the central axis A1 in the cross section and are symmetrical with each other with respect to the central axis A1.
- the cross-sectional shapes of the plurality of core portions 2 are the same circular shape.
- the cladding portion 3 surrounds the multiple core portions 2 .
- the cross-sectional shape of the cladding portion 3 is circular.
- the refractive index of the core portion 2 is higher than that of the clad portion 3.
- the core portion 2 and the clad portion 3 are made of a silica-based glass material.
- Each of the core portion 2 and the clad portion 3 is mainly composed of silica glass and contains a dopant for adjusting the refractive index.
- FIG. 2 is a flow chart showing the method for manufacturing the MCF base material according to the embodiment. As shown in FIG. 2, the method of manufacturing the MCF base material 1 includes a preparation step S1, an etching step S2, an insertion step S3, and an integration step S4.
- a plurality of core rods 4 (see FIG. 5) and a clad base material 7 (see FIG. 5) having a first end 7a connected to a first glass tube 5 and a second end 7b connected to a second glass tube 6 are prepared. 3) and the step of preparing.
- Preparation of the plurality of core rods 4 may be performed at least before the insertion step S3.
- the plurality of core rods 4 includes first core rods 41 (see FIG. 5) and second core rods 42 (see FIG. 8).
- the first core rod 41 and the second core rod 42 are collectively referred to as core rod 4 .
- Preparation of the clad base material 7 to which the first glass tube 5 and the second glass tube 6 are connected is performed before the etching step S2.
- the core rod 4 is a glass rod that becomes the core portion 2 (see FIG. 1).
- a plurality of core rods 4 have the same shape as each other.
- the core rod 4 has a cylindrical shape.
- the diameter of the core rod 4 is, for example, 9 mm or more and 15 mm or less.
- the longitudinal length of the core rod 4 may be 400 mm or longer, 800 mm or longer, or 1200 mm or longer. That is, the core rod 4 may be a rod-shaped member having an axial direction. As a result, the length of the optical fiber that can be manufactured from one MCF preform 1 (fiber length) can be increased, and the manufacturing cost per unit length of the optical fiber can be reduced.
- Fig. 3 is a perspective view of a clad base material to which a glass tube is connected.
- the clad base material 7 shown in FIG. 3 is a glass rod that will become the clad portion 3 (see FIG. 1).
- the clad base material 7 is a columnar member, and has, for example, a cylindrical shape.
- the diameter of the clad base material 7 is, for example, 40 mm or more and 120 mm or less.
- the length of the clad base material 7 in the longitudinal direction is the same as the length of the core rod 4 in the longitudinal direction.
- the clad base material 7 has a first longitudinal end 7a and a second longitudinal end 7b as its opposite ends.
- FIG. 4 is a cross-sectional view of the clad base material.
- a cross section perpendicular to the central axis A7 of the clad base material 7 is shown.
- the cladding matrix 7 has been perforated.
- the clad base material 7 has a plurality of holes 8 penetrating along the central axis A7 from the first end 7a to the second end 7b at positions deviated from the central axis A7 of the clad base material 7 .
- a central axis A8 (see FIG. 5) of each hole 8 is parallel to the central axis A7.
- the multiple holes 8 include first holes 81 and second holes 82 .
- the first hole portion 81 and the second hole portion 82 are collectively referred to as the hole portion 8 .
- a plurality of core rods 4 are inserted into the plurality of holes 8 .
- the first core rod 41 is inserted into the first hole portion 81 .
- the second core rod 42 is inserted into the second hole portion 82 .
- the arrangement of the plurality of holes 8 in the clad base material 7 is the same as the arrangement of the plurality of core portions 2 in the clad portion 3 .
- the first hole portion 81 and the second hole portion 82 are arranged at positions that are offset from the central axis A7 in the cross section and that are point-symmetrical to each other with respect to the central axis A7.
- the multiple holes 8 have the same shape.
- the hole 8 has a circular cross section. In the cross section, the first hole portion 81 and the second hole portion 82 are arranged in a direction orthogonal to the central axis A7.
- the diameter of each hole 8 is about the same as or longer than the diameter of the core rod 4, for example, 9 mm or more and 16 mm or less. Thereby, the diameter of each hole 8 after undergoing the etching step S2 becomes large enough to insert the core rod 4 therein.
- a first glass tube 5 is joined to the first end 7a of the clad base material 7, and a second glass tube 6 is joined to the second end 7b.
- the first glass tube 5 and the second glass tube 6 are dummy pipes.
- the first glass tube 5 and the second glass tube 6 have circular tubular shapes.
- the outer diameters of the first glass tube 5 and the second glass tube 6 are substantially the same as or smaller than the diameter of the clad base material 7 , and the inner diameters thereof are larger than the diameter of the core rod 4 .
- the first glass tube 5 and the second glass tube 6 are joined coaxially with the clad base material 7 . That is, the central axes of the first glass tube 5 and the second glass tube 6 match the central axis A7.
- the lengths of the first glass tube 5 and the second glass tube 6 are, for example, equal to each other.
- the length of the first glass tube 5 is long enough so that the heat generated from the external heat source in the etching process and the integration process does not have a large effect on the gripping part 9 (see FIG. 5).
- the length of the first glass tube 5 is, for example, 1000 mm or more and 2000 mm or less. Therefore, it is difficult to directly grasp the core rod 4 by hand and insert it into the hole 8 .
- the etching step S2 is a step of etching the inner surfaces of the plurality of holes 8 of the clad base material 7 for cleaning.
- an etching gas acting on the glass is introduced from the second glass tube 6 into the plurality of holes 8 of the cladding base material 7, discharged from the first glass tube 5, and heated by an external heat source (not shown).
- an external heat source for example, an induction furnace, a resistance furnace, an oxyhydrogen burner or the like is used.
- an induction furnace, a resistance furnace, an oxyhydrogen burner or the like is used.
- the inner surface layers of the plurality of holes 8 are scraped off to a certain extent, and the impurities present on the inner surfaces are removed and the inner surfaces are smoothed.
- a toxic gas such as Cl2 gas is used as an etching gas in addition to, for example, SF6 gas. Therefore, it is necessary to perform the etching step S2 in a closed system isolated from the external environment.
- the etching step S ⁇ b>2 is performed by connecting a gas inlet (not shown) to the second glass tube 6 and connecting a gas outlet (not shown) to the first glass tube 5 .
- a gas inlet not shown
- a gas outlet not shown
- Another problem is that in the etching step S2 and the integration step S4, it is necessary to heat the clad base material effective portion to a high temperature, but it is difficult to prepare a gas introduction portion and a gas discharge portion that can withstand such high temperatures. It's for the sake of it.
- the inserting step S3 is a step of inserting a plurality of core rods 4 into a plurality of holes 8 of the clad base material 7 using a rod inserting jig 11 (see FIG. 5).
- the insertion step S3 is performed after the preparation step S1 and the etching step S2.
- FIG. 5 is a cross-sectional view for explaining the insertion process.
- the first glass tube 5 and the second glass tube 6 are inserted into the grasping portions 9 and 10 of the glass lathe so that the central axis A7 of the clad base material 7 coincides with the horizontal direction. It is done while being held by Specifically, the first glass tube 5 is gripped by the gripper 9 and the second glass tube 6 is gripped by the gripper 10 .
- the first glass tube 5 and the second glass tube 6 are gripped by grippers 9 and 10 so as to be rotatable around the central axis A7.
- the gripping portions 9 and 10 are arranged in the first glass tube 5 and the second glass tube such that one hole 8 of the plurality of holes 8 is arranged at the lowest position in the vertical direction D2, that is, in the gravitational direction. 6 is rotating.
- the first hole 81 is arranged at the lowest position in the vertical direction D2
- the second hole 82 is arranged at the highest position in the vertical direction D2.
- the direction in which the first hole portions 81 and the second hole portions 82 are arranged coincides with the vertical direction D2.
- FIG. 6 is a perspective view showing the rod insertion jig according to the embodiment.
- the rod insertion jig 11 includes a holding portion 12, a support portion 14, and a moving portion 15.
- the rod insertion jig 11 inserts the clad base material 7 having both ends of which the first glass tube 5 and the second glass tube 6 are connected into the hole 8 passing through along the central axis A7 at a position deviated from the central axis A7. , insert the core rod 4 .
- the holding part 12 holds the core rod 4 and is inserted inside the first glass tube 5 .
- the holding portion 12 is supported by the support portion 14 inside the first glass tube 5 .
- the holding portion 12 is made of, for example, a heat-resistant and chemical-resistant resin such as fluororesin.
- the holding portion 12 has a hollow shape.
- the holding portion 12 is a circular tube.
- the holding portion 12 is formed to accommodate the core rod 4 therein.
- the holding portion 12 has a mounting surface 13 on which the core rod 4 is mounted along the axial direction D ⁇ b>1 of the core rod 4 . It can be said that the mounting surface 13 supports the side surface of the core rod 4 in the vertical direction D2.
- the mounting surface 13 is configured to guide the core rod 4 in the axial direction D1 of the core rod 4 .
- the mounting surface 13 extends in the longitudinal direction of the holding portion 12 .
- the mounting surface 13 is configured to guide the core rod 4 in the extending direction of the mounting surface 13 of the holding portion 12 .
- the core rod 4 is mounted on the mounting surface 13 such that the axial direction D1 coincides with the extending direction of the mounting surface 13 . Thereby, the core rod 4 mounted on the mounting surface 13 is guided along the axial direction D1.
- the mounting surface 13 is a curved surface that curves along the outer peripheral surface of the core rod 4 when viewed from the longitudinal direction of the holding portion 12 .
- the length of the holding part 12 in the longitudinal direction is longer than the length of the first glass tube 5 .
- the length of the holding portion 12 in the longitudinal direction may be 800 mm or longer, 1200 mm or longer, or 1600 mm or longer.
- the support portion 14 is installed in contact with the inner surface of the first glass tube 5 and supports the holding portion 12 in the vertical direction D2.
- the support portion 14 may be fixed to the holding portion 12 .
- the support portion 14 includes a first support member 141 and a second support member 142 that are spaced apart from each other in the longitudinal direction of the holding portion 12 .
- the first support member 141 and the second support member 142 are plate-shaped members having a predetermined thickness, and the holding portion 12 is arranged on the upper surface thereof.
- the first support member 141 and the second support member 142 are made of, for example, heat-resistant resin such as fluororesin.
- the first support member 141 and the second support member 142 have, for example, the same shape.
- the moving part 15 moves the core rod 4 by applying a pushing force in the axial direction D ⁇ b>1 to the end face of the core rod 4 held by the holding part 12 .
- the moving part 15 is, for example, a rod-shaped member having a circular cross section.
- the moving part 15 is made of, for example, heat-resistant resin such as fluororesin.
- the length of the moving portion 15 in the longitudinal direction is longer than the length of the holding portion 12 in the longitudinal direction. Thereby, the moving portion 15 can apply a pushing force to the core rod 4 from one end of the holding portion 12 to the other end.
- FIG. 7 is a cross-sectional view along line VII-VII in FIG.
- the holding portion 12 holding the core rod 4 is inserted into the inner space SP1 of the first glass tube 5 together with the support portion 14. placed in Thereby, the core rod 4 is arranged in the internal space SP1.
- the tip of the holding portion 12 faces the first end 7a of the clad base material 7 and is spaced apart from the first end 7a so as not to contact the first end 7a.
- the support part 14 is arranged so as to be in contact with the inner surface of the first glass tube 5 .
- the support portion 14 is arranged such that its thickness direction coincides with the vertical direction D2.
- the support portion 14 is configured to be able to adjust the insertion position and the insertion direction of the core rod 4 with respect to the hole portion 8 .
- the axial direction D1 of the core rod 4 is parallel to the central axis A7, and the entire core rod 4 mounted on the mounting surface 13 overlaps the hole portion 8 when viewed from the direction along the central axis A7. , the holding portion 12 is supported.
- the height position of the core rod 4 is set by the thickness of the support portion 14, for example.
- the width W is defined as the minimum width including all inner contacts of the support portion 14 to the inner surface of the first glass tube 5 in the horizontal direction perpendicular to the vertical direction D2 in the cross section of FIG.
- the core rod 4 (here, the first core rod 41) held by the holding portion 12 and arranged on the upper surface of the support portion 14 is arranged at the lowest position in the vertical direction D2 among the plurality of holes 8. It is positioned substantially coaxially with the hole 8 (here, the first hole 81).
- the support portion 14 is fixed to the holding portion 12 so that the longitudinal direction of the holding portion 12 is parallel to the central axis A7 when arranged in the internal space SP1 of the first glass tube 5 .
- the axial direction D1 of the core rod 4 becomes parallel to the central axis A7.
- an abutting portion 16 with which the tip of the core rod 4 abuts is arranged.
- the abutting portion 16 faces the second end 7b of the clad base material 7 and is spaced apart from the second end 7b so as not to contact the second end 7b.
- the abutting portion 16 is made of glass, for example.
- the abutting portion 16 functions as a stopper that restrains movement of the core rod 4 along the axial direction D1.
- the abutting portion 16 is provided with a vent hole having a size that the core rod 4 cannot pass through.
- the rod insertion jig 11 is taken out of the first glass tube 5 , the first glass tube 5 and the second glass tube 6 are rotated by 180 degrees with the holding parts 9 and 10 .
- the other hole 8 (here, the second hole 82) into which the core rod 4 is not inserted is arranged at the lowest position in the vertical direction D2.
- the rod insertion jig 11 is used to insert the second core rod 42 into the second hole 82 in the same manner as the insertion of the first core rod 41 .
- the number of holes 8 is two in this embodiment, each core rod 4 is inserted into each hole 8 using a rod insertion jig 11 in the case of three or more.
- the abutting portion 17 is inserted into the first glass tube 5 so as to abut against the inserted core rods 4 .
- the abutting portion 17 prevents the core rod 4 from slipping into the first glass tube 5 .
- the integration step S4 is a step of heating and melting the clad base material 7 and the plurality of core rods 4 inserted into the plurality of holes 8 of the clad base material 7 to integrate them.
- the integration step S4 is performed after the insertion step S3.
- FIG. 8 is a cross-sectional view for explaining the integration process.
- the heating section 18 heats the clad base material 7 and the core rod 4 .
- the heating part 18 is arranged, for example, so as to surround the clad base material 7 in the circumferential direction.
- the integration step S4 is performed, for example, while the clad base material 7 is being rotated by the gripping portions 9 and 10 . According to these, the clad base material 7 and the core rod 4 can be uniformly heated.
- the movement of the core rod 4 along the central axis A7 is restrained by the abutment portions 16 and 17.
- the abutting portion 16 is arranged in the internal space SP2 as described above.
- the abutting portion 17 is arranged in the internal space SP1.
- the abutting portion 17 faces the first end 7a of the clad base material 7 and is spaced apart from the first end 7a so as not to contact the first end 7a.
- the abutting portions 16 and 17 are arranged so as to sandwich the clad base material 7 in the direction (horizontal direction) along the central axis A7.
- the integration step S4 is performed while the pressure in the plurality of holes 8 is reduced by the pressure adjusters 19 and 20.
- the pressure adjusting section 19 is connected to the first glass tube 5 .
- the pressure adjusting section 20 is connected to the second glass tube 6 .
- the hole portion 8 shrinks and the clad base material 7 is integrated with the core rod 4 .
- the heating part 18 integrates the clad base material 7 and the core rod 4 over the entire length while moving along the central axis A7. As a result, an MCF base material 1 is produced.
- the core rod 4 is held by the holding portion 12 and inserted into the first glass tube 5 .
- the core rod 4 is mounted on the mounting surface 13 of the holding portion 12 and guided by the mounting surface 13 in the axial direction D1. Therefore, the moving part 15 can move the core rod 4 along the mounting surface 13 in the axial direction D1.
- the support portion 14 can appropriately adjust the insertion position and the insertion direction of the core rod 4 with respect to the hole portion 8 . Therefore, the core rod 4 can be inserted into the hole 8 while preventing the core rod 4 and the inner wall of the hole 8 from being damaged.
- the rod insertion jig 11 is used, so the core rod 4 can be inserted into the hole 8 while suppressing scratches and inclusion of foreign matter.
- the support portion 14 includes a first support member 141 and a second support member 142 separated from each other in the longitudinal direction of the holding portion 12 . Therefore, the holding portion 12 can be stably supported.
- the mounting surface 13 is a curved surface that curves along the outer peripheral surface of the core rod 4 when viewed from the longitudinal direction of the holding portion 12 . Therefore, the core rod 4 is mounted on the mounting surface 13 such that the axial direction D1 coincides with the extending direction of the mounting surface 13 . Therefore, it is easy to guide the core rod 4 in the axial direction D1.
- FIG. 9 is a cross-sectional view for explaining the insertion process using the rod insertion jig according to the first modified example.
- the rod insertion jig 11A according to the first modification differs from the rod insertion jig 11 (see FIG. 7) in the shape of the holding portion 12.
- the holding portion 12 of the rod insertion jig 11A is not a circular tube but a groove member having a U-shaped cross section with an open top.
- the holding part 12 of this modified example consists of a half-split tube, which is a circular tube split in half.
- the holding portion 12 holds the core rod 4 and is inserted into the first glass tube 5. Further, the holding portion 12 has a mounting surface 13 on which the core rod 4 is mounted, and the mounting surface 13 guides the core rod 4 in the axial direction D1. Therefore, the rod insertion jig 11A can also insert the core rod 4 into the hole 8 while suppressing scratches and contamination by foreign matter. According to 11 A of rod insertion jigs, the weight of the holding
- the holding portion 12 has a shape with an open top over the entire longitudinal direction, but may have a shape with an open top only in a partial section in the longitudinal direction. good. In this case as well, the weight of the holding portion 12 can be reduced compared to the holding portion 12 that is entirely circular in the longitudinal direction. Therefore, insertion of the core rod 4 into the hole 8 is facilitated.
- FIG. 10 is a cross-sectional view for explaining the insertion process using the rod insertion jig according to the second modified example.
- a rod insertion jig 11B according to the second modification shown in FIG. are different.
- the multiple holding portions 12 include first holding portions 121 that hold the first core rods 41 and second holding portions 122 that hold the second core rods 42 .
- the first holding portion 121 and the second holding portion 122 have the same configuration as the holding portion 12 of the rod insertion jig 11 .
- the first holding portion 121 has a first mounting surface 131 on which the first core rod 41 is mounted and guides the first core rod 41 in the axial direction of the first core rod 41 .
- the second holding portion 122 has a second mounting surface 132 on which the second core rod 42 is mounted and guides the second core rod 42 in the axial direction of the second core rod 42 .
- the first mounting surface 131 and the second mounting surface 132 have the same configuration as the mounting surface 13 of the rod insertion jig 11 .
- the plurality of moving parts 15 includes a first moving part and a second moving part.
- the first moving part and the second moving part have the same configuration as the moving part 15 of the rod insertion jig 11 .
- the first moving part applies force to the first core rod 41 held by the first holding part 121 to move the first core rod 41 .
- the second moving part applies force to the second core rod 42 held by the second holding part 122 to move the second core rod 42 .
- the second moving part is a member different from the first moving part.
- the support portion 14 is installed in contact with the inner surface of the first glass tube 5 and supports the first holding portion 121 and the second holding portion 122 .
- the first holding portion 121 and the second holding portion 122 are supported by the support portion 14 side by side so that their longitudinal directions are parallel to each other.
- the axial direction of the first core rod 41 held by the first holding portion 121 and the axial direction of the second core rod 42 held by the second holding portion 122 are parallel to each other.
- the gripping portions 9 and 10 are arranged so that the first hole portion 81 and the second hole portion 82 are arranged in the horizontal direction instead of the vertical direction D2. Rotate the first glass tube 5 and the second glass tube 6 to .
- the support portion 14 is arranged such that the axial direction of the first core rod 41 is parallel to the central axis A7 and the entire first core rod 41 overlaps the first hole portion 81 when viewed from the direction along the central axis A7. 1 holding portion 121 is supported.
- the support portion 14 is arranged such that the axial direction of the second core rod 42 is parallel to the central axis A7, and the second core rod 42 as a whole overlaps the second hole portion 82 when viewed from the direction along the central axis A7. , support the second holding portion 122 .
- the rod insertion jig 11B the insertion of the first core rod 41 into the first hole 81 and the insertion of the second core rod 42 into the second hole 82 can be performed at the same time, thereby shortening the manufacturing time. can be done.
- the rod insertion jigs 11, 11A, and 11B may be used for inserting glass rods other than the core rod 4.
- the glass rod other than the core rod 4 include a glass rod serving as a low refractive index portion and a core position marker.
- the number of moving parts 15 may be one in the rod insertion jig 11B. That is, the second moving part is the same member as the first moving part. Also in this case, the first core rod 41 and the second core rod 42 can be sequentially moved by one moving part 15 .
- the central axis A7 of the clad base material 7 does not necessarily have to coincide with the horizontal direction.
- the support portion 14 supports the holding portion 12 such that the axial direction D1 of the core rod 4 is parallel to the central axis A7. Therefore, if the central axis A7 is greatly inclined with respect to the horizontal direction, the core rod 4 may slide down from the mounting surface 13 due to gravity. can be tilted.
- the placement surface 13 may have a V-shape when viewed from the longitudinal direction of the holding portion 12 .
- the core rod 4 is mounted on the mounting surface 13 so that the axial direction D ⁇ b>1 coincides with the extending direction of the mounting surface 13 . Therefore, the mounting surface 13 can guide the core rod 4 in the axial direction D1.
- Rod insertion jig. (Appendix 2) a second holding part that holds a second glass rod whose axial direction is the second direction and is inserted into the inside of the first glass tube; a second moving part that applies force to the second glass rod held by the second holding part to move the second glass rod,
- the second holding part has a second mounting surface on which the second glass rod is mounted and extends in the second direction,
- the support portion is the hole portion in which the second direction is parallel to the central axis and the entire second glass rod is different from the first hole portion when viewed from a direction along the central axis. supporting the second holding part so as to overlap with the second hole;
- the rod insertion jig according to appendix 1.
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Abstract
Description
クラッド母材の両端にはガラスパイプが接続されているので、コア材は、典型的には1000mm程度先にある直径10mm程度の孔部に対して挿入される。かつ、孔部がクラッド材の中心軸上にないことから、コア材の挿入は容易ではない。挿入することはできても、挿入方向が孔部の軸方向からずれると、摩擦によりコア材及び孔部の内壁に傷が生じる。このような傷は、光ファイバにおける気泡となり、歩留が低下するおそれがある。
本開示によれば、傷及び異物の混入を抑制しながら、クラッド母材の孔部にガラスロッドを挿入可能なロッド挿入治具及びMCF母材の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ロッド挿入治具は、クラッド母材を貫通する孔部にガラスロッドを挿入する。クラッド母材は、互いに対向する第1端と第2端を有する柱状の部材であり、クラッド母材の中心軸と垂直な断面内において中心軸とは外れた位置で、第1端から第2端まで中心軸に沿って貫通する孔部である第1孔部を有する。クラッド母材の第1端には、第1ガラス管が接続されている。クラッド母材の第2端には、第2ガラス管が接続されている。第1孔部に挿入されるガラスロッドである第1ガラスロッドは、第1方向を軸方向とする棒状の部材である。ロッド挿入治具は、第1ガラス管の内面に接して設置される支持部と、第1ガラス管の内部において支持部に支持される第1保持部と、第1ガラスロッドを移動させるための部材である第1移動部と、を備える。第1保持部は、第1ガラスロッドが第1方向に沿って載置される第1載置面を有する。支持部は、第1方向から見て、第1載置面に載置された第1ガラスロッドの全体が第1孔部と重なるように、第1保持部を支持する。第1移動部は、第1載置面に載置された第1ガラスロッドを第1方向に移動させる。
本開示のロッド挿入治具及びMCF母材の製造方法の具体例を、以下に図面を参照しつつ説明する。なお、本発明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及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。図面の説明において同一の要素には同一の符号を付し、重複する説明を省略する。
(付記1)
第1端に第1ガラス管が接続され、前記第1端とは異なる第2端に第2ガラス管が接続されたクラッド母材において、前記クラッド母材の中心軸と垂直な断面内で前記中心軸とは外れた位置で、前記中心軸に沿って平行に前記クラッド母材を貫通する孔部に、ガラスロッドを挿入するロッド挿入治具であって、
第1方向を軸方向とする第1ガラスロッドを保持し、前記第1ガラス管の内部に挿入される第1保持部と、
前記第1ガラス管の内面に接して設置され、前記第1保持部を支持する支持部と、
前記第1保持部に保持された前記第1ガラスロッドに前記第1方向の力を加え、前記第1ガラスロッドを移動させる第1移動部と、を備え、
前記第1保持部は、前記第1ガラスロッドが載置され、前記第1方向に延在する第1載置面を有し、
前記支持部は、前記第1方向が前記中心軸に平行となり、かつ、前記中心軸に沿う方向から見て、前記第1ガラスロッドの全体が前記孔部である第1孔部と重なるように、前記第1保持部を支持する、
ロッド挿入治具。
(付記2)
第2方向を軸方向とする第2ガラスロッドを保持し、前記第1ガラス管の内部に挿入される第2保持部と、
前記第2保持部に保持された前記第2ガラスロッドに力を加え、前記第2ガラスロッドを移動させる第2移動部と、を更に備え、
前記第2保持部は、前記第2ガラスロッドが載置され、前記第2方向に延在する第2載置面を有し、
前記支持部は、前記第2方向が前記中心軸に平行となり、かつ、前記中心軸に沿う方向から見て、前記第2ガラスロッドの全体が前記第1孔部とは異なる前記孔部である第2孔部と重なるように、前記第2保持部を支持する、
付記1に記載のロッド挿入治具。
2…コア部
3…クラッド部
4…コアロッド
5…第1ガラス管
6…第2ガラス管
7…クラッド母材
7a…第1端
7b…第2端
8…孔部
9…把持部
10…把持部
11…ロッド挿入治具
11A…ロッド挿入治具
11B…ロッド挿入治具
12…保持部
13…載置面
14…支持部
15…移動部(第1移動部、第2移動部)
16…突き当て部
17…突き当て部
18…加熱部
19…圧力調整部
20…圧力調整部
41…第1コアロッド(第1ガラスロッド)
42…第2コアロッド(第2ガラスロッド)
81…第1孔部
82…第2孔部
121…第1保持部
122…第2保持部
131…第1載置面
132…第2載置面
141…第1支持部材
142…第2支持部材
A1…中心軸
A7…中心軸
D1…軸方向
D2…鉛直方向
SP1…内部空間
SP2…内部空間
Claims (10)
- クラッド母材を貫通する孔部にガラスロッドを挿入するロッド挿入治具であって、
前記クラッド母材は、
互いに対向する第1端と第2端を有する柱状の部材であり、
前記クラッド母材の中心軸と垂直な断面内において前記中心軸とは外れた位置で、前記第1端から前記第2端まで前記中心軸に沿って貫通する前記孔部である第1孔部を有し、
前記クラッド母材の前記第1端には、第1ガラス管が接続されており、
前記クラッド母材の前記第2端には、第2ガラス管が接続されており、
前記第1孔部に挿入される前記ガラスロッドである第1ガラスロッドは、第1方向を軸方向とする棒状の部材であり、
前記ロッド挿入治具は、
前記第1ガラス管の内面に接して設置される支持部と、
前記第1ガラス管の内部において前記支持部に支持される第1保持部と、
前記第1ガラスロッドを移動させるための部材である第1移動部と、を備え、
前記第1保持部は、前記第1ガラスロッドが前記第1方向に沿って載置される第1載置面を有し、
前記支持部は、前記第1方向から見て、前記第1載置面に載置された前記第1ガラスロッドの全体が前記第1孔部と重なるように、前記第1保持部を支持し、
前記第1移動部は、前記第1載置面に載置された前記第1ガラスロッドを前記第1方向に移動させる、
ロッド挿入治具。 - 前記クラッド母材は、前記第1孔部とは異なる前記孔部である第2孔部を更に有し、
前記第2孔部に挿入される前記ガラスロッドである第2ガラスロッドは、第2方向を軸方向とする棒状の部材であり、
前記ロッド挿入治具は、
前記第1ガラス管の内部において前記支持部に支持される第2保持部と、
前記第2ガラスロッドを移動させるための部材である第2移動部と、を更に備え、
前記第2保持部は、前記第2ガラスロッドが前記第2方向に沿って載置される第2載置面を有し、
前記支持部は、前記第2方向から見て、前記第2載置面に載置された前記第2ガラスロッドの全体が前記第2孔部と重なるように、前記第2保持部を支持し、
前記第2移動部は、前記第2載置面に載置された前記第2ガラスロッドを前記第2方向に移動させる、
請求項1に記載のロッド挿入治具。 - 前記第2移動部は、前記第1移動部と同じ部材である、
請求項2に記載のロッド挿入治具。 - 前記第2移動部は、前記第1移動部と異なる部材である、
請求項2に記載のロッド挿入治具。 - 前記支持部は、前記第1保持部の長手方向において互いに離隔する第1支持部材及び第2支持部材を含んでいる、
請求項1から請求項4のいずれか一項に記載のロッド挿入治具。 - 前記第1載置面は、前記第1保持部の長手方向から見て、前記第1ガラスロッドの外周面に沿う湾曲面である、
請求項1から請求項5のいずれか一項に記載のロッド挿入治具。 - 前記第1保持部の長手方向の長さは、前記第1ガラス管の長手方向の長さより長い、
請求項1から請求項6のいずれか一項に記載のロッド挿入治具。 - 前記第1移動部の長手方向の長さは、前記第1保持部の長手方向の長さより長い、
請求項1から請求項7のいずれか一項に記載のロッド挿入治具。 - 前記第1保持部は、前記第1保持部の先端が、前記クラッド母材の前記第1端から離隔するように配置される、
請求項1から請求項8のいずれか一項に記載のロッド挿入治具。 - 第1端に第1ガラス管が接続され、中心軸から外れた位置において前記中心軸に沿った方向に孔部が貫通しているクラッド母材を準備することと、
ガラスロッドを準備することと、
請求項1から請求項9のいずれか一項に記載のロッド挿入治具を用いて、前記孔部に前記ガラスロッドを挿入することと、
前記クラッド母材と、前記孔部に挿入された前記ガラスロッドとを一体化することと、を含む、
マルチコア光ファイバ母材の製造方法。
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JP2021189293A (ja) | 2020-05-29 | 2021-12-13 | 株式会社日立エルジーデータストレージ | 虚像投射装置 |
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JPS57118042A (en) * | 1981-01-13 | 1982-07-22 | Showa Electric Wire & Cable Co Ltd | Manufacture of preform rod for optical fiber |
JP2001247324A (ja) * | 2000-03-07 | 2001-09-11 | Shin Etsu Chem Co Ltd | 光ファイバ用プリフォームの製造方法及びプリフォーム |
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