WO2018181739A1 - 光ファイバ母材の懸架構造、懸架方法、および光ファイバの製造方法および懸架方法 - Google Patents
光ファイバ母材の懸架構造、懸架方法、および光ファイバの製造方法および懸架方法 Download PDFInfo
- Publication number
- WO2018181739A1 WO2018181739A1 PCT/JP2018/013308 JP2018013308W WO2018181739A1 WO 2018181739 A1 WO2018181739 A1 WO 2018181739A1 JP 2018013308 W JP2018013308 W JP 2018013308W WO 2018181739 A1 WO2018181739 A1 WO 2018181739A1
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- WIPO (PCT)
- Prior art keywords
- optical fiber
- fiber preform
- suspension
- suspension structure
- dummy rod
- Prior art date
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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
- C03B37/02—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
- C03B37/02736—Means for supporting, rotating or feeding the tubes, rods, fibres or filaments to be drawn, e.g. fibre draw towers, preform alignment, butt-joining preforms or dummy parts during feeding
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/022—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from molten glass in which the resultant product consists of different sorts of glass or is characterised by shape, e.g. hollow fibres, undulated fibres, fibres presenting a rough surface
- C03B37/023—Fibres composed of different sorts of glass, e.g. glass optical fibres, made by the double crucible technique
- C03B37/0235—Thermal treatment of the fibre during the drawing process, e.g. cooling
-
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
Definitions
- the present invention relates to a suspension structure and suspension method for an optical fiber preform, and more particularly to a suspension structure and suspension method for carrying a glass preform for an optical fiber into a drawing furnace during the production of the optical fiber, and an optical fiber production method and suspension method. .
- optical fiber base material When manufacturing optical fibers, the optical fiber glass base material (hereinafter referred to as “optical fiber base material”) is transported to the vicinity of the drawing furnace, replaced with a suspension mechanism, and suspended in the core tube of the drawing furnace. To do. Then, by heating the drawing furnace, the optical fiber preform is melted to draw the optical fiber.
- connection cylinder is arranged in advance, the dummy rod is inserted into the connection cylinder, and the pin is inserted into the hole drilled so that both penetrate.
- the connection cylinder is arranged in advance, the dummy rod is inserted into the connection cylinder, and the pin is inserted into the hole drilled so that both penetrate.
- laborious work such as engagement between the connecting cylinder and the dummy rod and insertion of a pin occurs.
- the pins since the optical fiber preform is supported only by the pins, the pins may be deformed or damaged.
- the present invention has been made in view of these circumstances, and provides a suspension structure and a suspension method for easily and surely carrying an optical fiber preform into a drawing furnace, and a method for manufacturing an optical fiber. Is the purpose.
- One embodiment of the suspension structure of an optical fiber preform of the present invention is a suspension structure for carrying an optical fiber preform into a drawing furnace, wherein the optical fiber preform is carried into the drawing furnace.
- the dummy rod portion connected to the upper portion is formed with a suspended portion made of a concave or convex shape or a hole, covering at least a part of the periphery of the dummy rod portion, and on both sides in a direction perpendicular to the drawing direction.
- a joining mechanism having an extended arm portion and a holding portion that engages with the suspension portion to hold the optical fiber preform, and a grip portion that engages the arm portion and suspends the optical fiber preform.
- an engagement mechanism having
- one embodiment according to the suspension method of the present invention is a suspension method for carrying an optical fiber preform into a drawing furnace, and is connected to an upper portion of the optical fiber preform carried into the drawing furnace.
- the dummy rod portion has a concave or convex shape or a suspension portion formed of a hole, covers at least a part of the periphery of the dummy rod portion, and extends to both sides in the direction perpendicular to the drawing direction.
- a holding portion that engages with the suspension portion and holds the optical fiber preform, and holds the optical fiber preform with a joining mechanism, and the arm portion suspends the optical fiber preform. It is set as the structure engaged with the engaging mechanism which has.
- an optical fiber preform is suspended using the above-described suspension structure, the optical fiber preform is inserted into a drawing furnace, and the optical fiber The optical fiber is drawn by heating and melting the base material in the drawing furnace.
- the present invention it is possible to improve the productivity of the optical fiber drawing work by providing a suspension structure and a suspension method for easily and surely carrying the optical fiber preform into the drawing furnace.
- An embodiment of the present invention is a suspension structure for carrying an optical fiber preform into a drawing furnace, and a dummy connected to an upper portion of the optical fiber preform carried into the drawing furnace
- the rod portion has a concave or convex shape or a suspension portion formed of a hole, covers at least a part of the periphery of the dummy rod portion, and extends to both sides in the direction perpendicular to the drawing direction,
- a holding mechanism that engages with the suspension and holds the optical fiber preform, and an engagement mechanism that includes a gripper that engages the arm and suspends the optical fiber preform.
- the arm portion having sufficient strength can be obtained by holding the optical fiber preform in the engagement mechanism provided with the arm portion using the suspension portion previously formed on the upper portion of the optical fiber preform. Therefore, the optical fiber preform can be easily carried in, and the optical fiber preform can be reliably disposed in the drawing furnace.
- the suspension part can be formed in a concave or convex shape or a hole, and does not have to be a flat surface, but may be a slope or a curved surface facing downward, and the holding part so as to correspond to these surfaces and contact points. Is supposed to be provided.
- the suspension portion has a convex ring shape or a spherical shape that is uniformly formed on the periphery of the dummy rod portion, and the holding portion has the ring shape or A spherical shape is inserted.
- the suspension part and the holding part are evenly arranged on the circumference so that the optical fiber preform suspended at the same position when engaged is stabilized.
- at least two locations may be provided so as to face each other, or may be provided over the entire circumference.
- the dummy rod portion can be formed in advance so as to leave a stepped suspension portion, and the optical fiber preform can be easily engaged by inserting the annular or spherical suspension portion into the holding portion.
- the optical fiber preform can be stably suspended.
- the convex ring shape or spherical shape may be any shape, and for example, the convex cross section may be a semicircular shape or a rectangular shape.
- the suspension part is a concave groove formed uniformly on the periphery of the dummy rod part, and the holding part is fitted into the groove. .
- the suspension part and the holding part are evenly arranged on the circumference so that the optical fiber preform suspended at the same position when engaged is stabilized.
- at least two locations may be provided so as to face each other, or may be provided over the entire circumference.
- a groove-like suspension can be formed by performing simple processing on the dummy rod portion, and by inserting the holding portion into this suspension portion, the optical fiber preform can be easily engaged, The optical fiber preform can be suspended stably.
- the suspension portion is a through hole, and the through hole is a dummy rod portion connected to an upper portion of the optical fiber preform carried into the drawing furnace.
- the arm portion is formed so as to be orthogonal to the drawing direction, the arm portion is formed with a guide hole communicating with the through hole, and the heel holding portion is a pin inserted into the through hole and the guide hole.
- the suspension mechanism is a pin that is inserted into the through hole
- the holding portion is a pin that is inserted into the through hole, so that the joining mechanism is pinned to the through hole of the dummy rod portion that is previously connected to the upper portion of the optical fiber preform.
- the engagement mechanism is attached to a lower end of a support bar suspended in advance on the drawing furnace, and the optical fiber mother
- the joint mechanism includes a housing portion that accommodates a part of the joining mechanism with which a material is engaged, and the gripping portion extends on both sides of the housing portion, the tip is formed in a key shape, and is housed. It is set as the structure provided with the latching
- the posture of the optical fiber preform can be adjusted. That is, the attitude of the optical fiber preform can be stabilized and the distance between the drawing furnace side wall and the optical fiber preform can be finely adjusted.
- a side receiving surface that faces a side surface of the dummy bar portion is formed in the engagement mechanism, and is in a direction orthogonal to the drawing direction.
- a swinging member having a convex surface having a predetermined curvature is swingably attached to the engagement mechanism so that the convex surface and the side receiving surface are in contact with each other.
- a configuration in which a concave base material receiving surface having a curvature of a side peripheral surface of the dummy rod portion or the joining mechanism is formed on a side of the member facing the side surface of the dummy rod portion or the joining mechanism.
- the rocking member is interposed between the engagement mechanism and the optical fiber preform.
- the swing member is attached so as not to fall from the engagement mechanism, but the attachment method is freely swingable with respect to the engagement mechanism. Further, since the dummy rod portion of the swing member or the joining mechanism side has a convex surface having a predetermined curvature in a direction orthogonal to the drawing direction, the swing range with respect to the drawing direction is provided. Has increased.
- the optical fiber preform side of the swing member has a concave surface that matches the curvature of the cylindrical preform, and when the optical fiber preform is carried into the drawing furnace, the concave preform Since the optical fiber preform and the swing member are in close contact with each other by the receiving surface, a stable holding state can be maintained.
- the close swing member swings due to its own weight and takes an unreasonable posture such as a tilted state. Can be prevented. It should be noted that the swing range does not need to be set strictly unless the dummy rod portion has a large bend or irregularity.
- the convex surface of the swing member is a side peripheral surface that matches the circumferential curvature of the side receiving surface of the engagement mechanism, so that the contact state between the engagement mechanism and the swing member can be made smooth. it can.
- the stepped through hole having a small diameter on the side receiving surface side is formed in the thickness direction from the optical fiber preform of the swinging member to the side receiving surface to which the swinging member of the engagement mechanism is attached.
- the swing member is attached to the engagement mechanism with a screw provided with a head that does not come out from the small diameter side of the through hole.
- the optical fiber preform can be securely held by further including a cover portion that covers the engagement mechanism and the joining mechanism. It is possible to prevent the optical fiber preform from falling due to vibration or the like.
- the cover portion includes a surrounding portion facing a side surface of the optical fiber preform, and the surrounding portion has azimuth angle directions different from each other with respect to the drawing direction.
- a configuration is provided in which an adjustment unit that extends and contracts to adjust the posture of the optical fiber preform is provided.
- the posture of the optical fiber preform can be adjusted. That is, the attitude of the optical fiber preform can be stabilized and the distance between the drawing furnace side wall and the optical fiber preform can be finely adjusted.
- the adjustment section is arranged above and below the arm section of the arm section with respect to the drawing direction.
- the adjustment units when there are three adjustment units, two adjustment units are provided on the upper side or the lower side, and one is provided on the lower side or the upper side with respect to the arm unit connected to the upper part of the optical fiber preform. It is possible to easily adjust the inclination of the optical fiber preform in the drawing direction.
- the suspension structure includes at least three adjustment portions, and the two adjustment portions are located above or below the arm portion so as to have an azimuth angle substantially perpendicular to each other.
- the one adjusting part is arranged on the upper side or the lower side of the arm part so as to have a substantially central azimuth angle with respect to the two adjusting parts.
- the two adjustment parts on the upper side or the lower side of the arm part are arranged so as to have azimuth angles that are substantially perpendicular to each other, thereby performing a delicate adjustment. be able to.
- the ease of the adjustment work of the left-right direction can be ensured by making the arrangement
- the adjustment unit is a screw that is movable in the azimuth direction by turning.
- the stepped through hole having a small diameter on the side receiving surface side is formed in the thickness direction from the optical fiber preform of the swinging member to the side receiving surface to which the swinging member of the engagement mechanism is attached.
- the swing member is attached to the engagement mechanism with a screw provided with a head that does not come out from the small diameter side of the through hole.
- a buffer member is provided on one or both of the side of the engagement mechanism that faces the joining mechanism and the side of the cover that faces the joining mechanism.
- the impact at the time of carrying the optical fiber preform into the drawing furnace and the transmission of vibrations from the outside to the optical fiber preform can be reduced. It is possible to prevent the optical fiber preform from vibrating in the drawing furnace.
- An embodiment of the present invention is a suspension method for carrying an optical fiber preform into a drawing furnace, wherein the dummy rod portion is connected to an upper portion of the optical fiber preform carried into the drawing furnace.
- the arm portion having sufficient strength can be obtained by holding the optical fiber preform in the joining mechanism having the arm portion using the suspension portion formed in advance on the upper portion of the optical fiber preform. Therefore, the optical fiber preform can be easily carried in, and the optical fiber preform can be reliably placed in the drawing furnace.
- the suspension part and the holding part may be arranged evenly on the circumference so that the optical fiber preform suspended at the same position when engaged is stabilized. For example, at least two locations may be provided so as to face each other, or may be provided over the entire circumference.
- the suspension portion does not need to be a flat surface, and may be a slope or a curved surface facing downward, and a holding portion is provided so as to correspond to these surfaces and contact points.
- the optical fiber preform is suspended using the suspension structure according to any one of (1) to (14), the optical fiber preform is inserted into a drawing furnace, and the optical fiber preform is The optical fiber is drawn by heating and melting in the drawing furnace.
- the work of carrying in the optical fiber preform can be easily performed, and the optical fiber preform can be surely arranged in the drawing furnace, so that workability and productivity can be improved.
- FIG. 1 is a perspective view for explaining an outline of a dummy rod portion on an optical fiber preform in the first embodiment of the present invention.
- FIG. 2 is a perspective view showing an outline of the adapter (joining mechanism) in the first embodiment of the present invention.
- FIG. 3 is an explanatory view showing a state in which an adapter (joining mechanism) is attached to the optical fiber preform (dummy rod portion) in the first embodiment of the present invention.
- FIG. 4 is a perspective view for explaining the outline of a hanger (engagement mechanism) and a cover in the first embodiment of the present invention.
- FIG. 3 in order to avoid complexity, only the reference numerals necessary for explanation are shown, and FIGS.
- the suspension structure 100 includes an adapter (joining mechanism) 20 attached to a dummy bar portion 11 connected to an upper portion of an optical fiber preform 10 and a hanger (engagement) with which the adapter 20 is engaged. Mechanism) 50. There may be a cover (cover portion) 70 that covers the adapter 20 and the dummy rod portion 11 after the dummy rod portion 11 is accommodated in the hanger 50.
- the optical fiber preform 10 is carried into the drawing furnace with the dummy rod portion 11 positioned at the top.
- the dummy rod does not have to be made of the same glass as the optical fiber preform 10 and can be made of metal, and a form suitable for the manufacturing process can be appropriately selected.
- an annular convex portion 12 (suspension portion) is formed in a direction orthogonal to the vertical direction in FIG.
- the convex ring may have any shape as long as it has a step, and the convex cross section is not limited to a semicircular shape as shown in FIG. 1 and may be a rectangular shape.
- the convex ring does not have to extend over the entire circumference, and may be formed uniformly on the circumference, for example, by providing two places so as to face each other.
- the adapter 20 covers at least a part of the periphery of the dummy bar portion 11 and extends on both sides in a direction orthogonal to the drawing direction, and an annular convex portion 12 (suspension portion).
- a holding portion 25 that engages and holds the optical fiber preform 10 is provided.
- the adapter 20 is attached with a lid portion 40 for preventing the optical fiber preform 10 from falling after the dummy rod portion 11 is accommodated.
- the arm portion 30 is a cylindrical member, and is engaged with the grip portion 60 of the hanger 50 when the adapter 20 is accommodated in the hanger 50.
- the position of the arm part 30 is arranged above the holding part 25, but is not limited to the upper part.
- the arm part 30 may have the same height as the holding part 25.
- the lower part may be lower than the holding part 25.
- the adapter 20 includes a dummy bar accommodating portion 21 that accommodates the dummy rod portion 11 of the optical fiber preform 10 from the side surface.
- a curved surface having an inner diameter substantially coincident with the outer diameter of the dummy rod portion 11 of the optical fiber preform 10 is formed in the dummy rod housing portion 21, and this curved surface allows the dummy rod portion 11 of the optical fiber preform 10 to be dummy from the opening 23.
- a semicircular shape is used so as to enter the rod accommodating portion 21 and stably accommodate thereafter.
- the dummy rod accommodating portion 21 is formed with a holding portion 25 that is a concave groove having a shape matching the annular convex portion 12.
- the lid 40 is attached to the adapter 20 in order to prevent the optical fiber preform 10 from falling after the dummy rod 11 is accommodated.
- the lid 40 is attached to the mounting holes 26 and 27 of the adapter 20 by set screws 41 and 42.
- the attachment method using a set screw is an example, and any attachment method may be used as long as the optical fiber preform 10 accommodated therein does not fall due to vibration or the like.
- the holding portion 25 is a concave groove that descends as it goes deeper from the opening 23 with respect to the direction of entry into the dummy rod housing portion 21, and includes the corresponding annular convex portion 12, an optical fiber preform 10 can prevent dropping due to vibration or the like, and the lid 40 may not be required.
- the adapter 20 and the lid 40 are made of a material that can withstand the temperature environment on the drawing furnace, and for example, a metal material such as austenitic stainless steel or Inconel can be applied. However, since the place where the adapter 20 is arranged in the drawing furnace does not reach a high temperature that melts the glass, a metal such as general stainless steel can also be used. Note that the material is not limited to metal, and quartz or carbon can also be applied. Moreover, the arm part 30 extended on both sides may be integrally machined with metal, or may be mechanically coupled.
- the adapter 20 is moved toward the dummy rod portion 11 of the optical fiber preform 10.
- the annular convex portion 12 formed on the dummy rod portion 11 is fitted into the holding portion 25 of the adapter 20, and the dummy rod portion 11 is accommodated in the dummy rod accommodating portion 21.
- the lid portion 40 is mounted in the mounting holes 26 and 27 of the adapter 20 with set screws 41 and 42.
- the optical fiber preform 10 is engaged with the adapter 20 as shown in FIG.
- the optical fiber preform 10 can be supported by the adapter 20 having sufficient strength by engaging the dummy rod portion 11 and the adapter 20 as shown in FIG. Etc., and a stable state can be maintained even in the drawing furnace. As described above, this embodiment can avoid the strength problem caused by supporting the optical fiber preform 10 with only the pins 32 as in Patent Document 1.
- a support bar 1 is suspended in advance on a drawing furnace, and a hanger 50 is attached to the lower end of the support bar 1.
- the support rod 1 and the hanger 50 may be mechanically coupled, for example, or may be coupled by welding or the like.
- the support rod 1 and the hanger 50 can be appropriately selected from materials according to the thermal environment in the drawing furnace, and for example, a metal material such as austenitic stainless steel or Inconel can be applied.
- a metal such as general stainless steel can also be used.
- the hanger 50 includes a gripping portion 60 that is suspended when the arm portion 30 of the adapter 20 with which the dummy rod portion 11 of the optical fiber preform 10 is engaged, and a housing portion 51 that houses the adapter 20. Yes.
- An attachment hole 53 for attaching the cover 70 is drilled above the accommodating portion 51.
- the gripping portion 60 includes a placement portion 62 that extends on each side of the accommodating portion 51 and places the arm portion 30 thereon. In addition, it is good also as a structure which forms the front-end
- a side receiving surface 52 that receives the side surface of the optical fiber preform 10 is formed.
- a cushioning material such as felt may be provided to alleviate the impact when the optical fiber preform 10 is carried.
- the cover 70 covers the adapter 20 engaged with the hanger 50, and is attached to the mounting hole 53 of the hanger 50 by a set screw 71.
- the cover 70 can appropriately select a material according to the thermal environment in the drawing furnace, and for example, a metal material such as austenitic stainless steel or Inconel can be applied. However, since the place where the cover 70 is arranged in the drawing furnace does not reach a high temperature that melts the glass, a general metal such as stainless steel can also be used. Note that the material is not limited to metal, and quartz or carbon can also be applied.
- the buffer member 75 may be disposed on the side where the cover 70 covers the adapter 20. By carrying out like this, it can suppress that an optical fiber preform
- the hanger 50 is attached to the support rod 1 suspended in the drawing furnace, and the optical fiber preform 10 with the adapter 20 provided with the arm portion 30 is engaged with the hanger 50. It moves toward the accommodating part 51.
- the optical fiber preform 10 with which the adapter 20 is engaged is accommodated in the accommodating portion 51 of the hanger 50, and the arm portion 30 is placed on the placing portion 62.
- the cover 70 is moved so as to cover the adapter 20 engaged with the hanger 50, the cover 70 is attached and is attached to the attachment hole 53 of the hanger 50 by the set screw 71.
- the adapter 20 can be fitted with the gripping portion 60 and put into a state where the lid is covered with the cover 70.
- the optical fiber preform is used in the adapter 20 (engagement mechanism) provided with the arm portion 30 by using the annular convex portion 12 (suspension portion) formed in advance on the optical fiber preform 10.
- 10 can be coupled to the engagement mechanism using an arm portion having sufficient strength, so that the optical fiber preform can be easily carried in and the optical fiber preform can be securely placed in the drawing furnace. Can be arranged.
- cover 70 that covers the adapter 20 after being attached to the hanger 50, it is possible to prevent the optical fiber preform 10 from falling due to thermal change or vibration in the drawing furnace.
- the optical fiber preform 10 with which the adapter 20 was engaged by mounting the arm part 30 on the hook structure (the latching
- FIG. 5 is a perspective view for explaining the outline of the cover according to the second embodiment of the present invention.
- FIG. 6 is a perspective view for explaining the outline of the swing member in the second embodiment of the present invention.
- FIG. 7 is a diagram for explaining the outline of the posture adjustment of the optical fiber preform (dummy rod portion) in the second embodiment of the present invention.
- the second embodiment of the present invention enables a cover 90 provided with adjusting portions 91, 92, 93, which is configured to adjust the posture of the optical fiber preform 10 in the first embodiment, and swing during posture adjustment.
- the swing member 80 is added.
- the cover 90 includes a surrounding portion 98 disposed at a position facing the lid portion 40 of the adapter 20 attached to the optical fiber preform 10.
- the surrounding portion 98 is provided with a first adjustment portion 91 on the upper side, and a second adjustment portion 92 and a third adjustment portion 93 on the lower side.
- the 2nd adjustment part 92 and the 3rd adjustment part 93 are distribute
- the 1st adjustment part 91 is distribute
- the optical fiber preform 10 to which the adapter 20 is attached can be appropriately pushed and pulled from the three directions by providing three adjustment portions 91, 92, 93 having different azimuth angles, the optical fiber preform 10
- the posture can be adjusted. That is, the posture due to the weight of the optical fiber preform 10 can be stabilized, and the distance between the side wall of the drawing furnace and the optical fiber preform 10 can be changed according to slight bends or changes in the thickness of the optical fiber preform 10. Fine adjustments can be made.
- positioning location shown here are examples, and can be suitably selected according to the space between the drawing furnace and the optical fiber preform 10, the shape of the optical fiber preform 10, and the like.
- one adjustment unit is arranged on the upper side of the surrounding portion 98 and two adjustment units are arranged on the lower side.
- two adjustment units may be provided on the upper side and one adjustment unit on the lower side.
- the adjustment units 91, 92, 93 include adjustment screws 94, 95, 96 that move in the respective azimuth directions by turning, and the optical fiber preform on which the adapter 20 is mounted by expanding and contracting in the respective azimuth directions.
- 10 postures can be adjusted. For example, by applying a knurled bolt or a butterfly bolt to the adjustment screws 94, 95, and 96, the posture can be arbitrarily adjusted by easily turning with fingers.
- the optical fiber preform 10 to which the adapter 20 is attached is adjusted.
- the optical fiber preform 10 may be directly adjusted by an adjustment screw.
- the glass member may be damaged. Therefore, it is preferable to adopt a structure in which the adapter 20 using metal or the like is pushed and pulled by the adjusting screw.
- the swing member 80 is attached by a bolt 85 to an attachment hole 55 formed in the side receiving surface 52 (see also FIG. 4) that shows only a part of the phantom line.
- the swing member 80 includes a convex contact surface 81 having a predetermined curvature in a direction orthogonal to the drawing direction. And, on the side facing the side surface of the dummy rod portion 11 or the joining mechanism (adapter 20) of the swing member 80, a concave shape having the curvature of the side peripheral surface of the dummy rod portion 11 or the joining mechanism (adapter 20).
- a base material receiving surface 83 is formed.
- a material corresponding to the thermal environment in the drawing furnace can be appropriately selected.
- a metal material such as austenitic stainless steel or Inconel can be applied.
- a metal material such as austenitic stainless steel or Inconel
- the place where the rocking member 80 is arranged in the drawing furnace does not reach a high temperature that melts the glass, so that a metal such as general stainless steel can also be used.
- the material is not limited to metal, and quartz or carbon can also be applied.
- a stepped hole 84 that is penetrated to allow the bolt 85 to pass therethrough is drilled.
- the stepped hole 84 is a stepped hole in which the small diameter side is disposed on the contact surface 81 side and the large diameter side is disposed on the base material receiving surface 83 side.
- the diameter of the small diameter is larger than the diameter of the screw portion of the bolt 85, a gap is provided on the top, bottom, left, and right of the screw portion, and a hexagonal bolt is used to prevent the head of the bolt 85 from coming off. If it is an attached bolt, it is formed so as to be smaller than the diameter.
- the diameter of the large diameter is formed so as to provide gaps in the vertical and horizontal directions with respect to the width of a hexagonal bolt if it is a hexagonal bolt and the diameter of a grooved or holed bolt.
- the swing member 80 is attached in a state of loosely fitting to the hanger 50 by the bolt 85, the attachment hole 53, and the stepped hole 84.
- the contact surface 81 of the swing member 80 has a convex surface having a predetermined curvature in a direction orthogonal to the drawing direction on the engagement mechanism side.
- the swing range for the pulling direction is increased.
- the base material receiving surface 83 of the swing member 80 is a concave surface that matches the curvature of the dummy rod portion 11 or the joining mechanism (adapter 20), and when the optical fiber base material 10 is accommodated on the drawing furnace, Due to the concave base material receiving surface 83, the dummy rod portion 11 on which the adapter 20 is mounted and the swing member 80 are brought into close contact with each other. While maintaining this close state, the attitude of the optical fiber preform 10 is adjusted by the adjusting units 91, 92, 93, so that the optical fiber preform 10 can be finely adjusted without contacting the surroundings. It is possible.
- FIG. 7A is a front view as viewed from the cover 90 side
- FIG. 7B is a part of a cross-sectional view taken along the line AA as viewed from the arrow S in FIG. 7A. Since FIG. 7 shows a configuration related to posture adjustment, a part of the configuration is omitted.
- the drawing direction is orthogonal to the Z axis and the Z axis
- the machine axis direction of the arm 30 is the Y axis
- the direction orthogonal to the Y axis and the Z axis is The X axis is assumed.
- the optical fiber preform 10 is attached to the hanger 50 via the arm 30 of the adapter 20, and the cover 90 is attached to the hanger 50.
- FIG. 7A the optical fiber preform 10 is attached to the hanger 50 via the arm 30 of the adapter 20, and the cover 90 is attached to the hanger 50.
- the adjusting portions 91, 92, 93 are arranged at positions that are vertically movable and have different azimuth angles, and the forces F1, F2-1, F2-2 are applied by the adjusting portions 91, 92, 93. Adjustment makes it possible to finely adjust ⁇ x and ⁇ y. By finely adjusting ⁇ x and ⁇ y, the optical fiber preform 10 can be in an appropriate posture.
- the present invention is not limited to this, and the space near the drawing furnace and accessibility during adjustment, that is, manual adjustment.
- the number of positions and positions of the adjustment unit can be appropriately set depending on whether the finger reaches the adjustment unit or whether adjustment is easy when adjusting using a tool or the like.
- FIG. 8 is a perspective view for explaining the outline of the dummy rod portion on the optical fiber preform in the third embodiment of the present invention.
- FIG. 9 is a perspective view showing an outline of an adapter (joining mechanism) in the third embodiment of the present invention.
- FIG. 10 is an explanatory view showing a state in which an adapter (joining mechanism) is attached to the optical fiber preform (dummy rod portion) in the third embodiment of the present invention.
- the joining of the optical fiber preform and the adapter is different from the first embodiment, and the engagement with the hanger (engaging mechanism) (first embodiment) or
- the attitude adjustment of the optical fiber preform is the same as the configuration described in the first or second embodiment, and the description thereof is omitted.
- the third embodiment of the present invention includes an adapter (joining mechanism) 120 attached to a dummy rod portion 111 connected to the upper part of the optical fiber preform 110, and a hanger (engaging mechanism) 50 with which the adapter 120 is engaged. Consists of. Note that there may be a cover (cover portion) 70 that covers the adapter 120 dummy rod portion 111 after the dummy rod portion 111 is accommodated in the hanger 50.
- annular recess 112 (suspension portion) is formed in a direction orthogonal to the vertical direction of FIG.
- the concave groove may have any shape as long as it has a step, and is not limited to the rectangular groove in a sectional view as shown in FIG. 8, but may be a semicircular shape in a sectional view. Furthermore, the concave groove does not have to extend over the entire circumference, and may be formed uniformly on the circumference, for example, by providing two locations so as to face each other.
- the adapter 120 covers at least a part of the periphery of the dummy bar portion 111 and is engaged with an arm portion 130 extending on both sides in a direction orthogonal to the drawing direction, and an annular recess 112 (suspension portion).
- a holding portion 125 that holds the optical fiber preform 110 is provided.
- the adapter 120 is attached with a lid portion 140 for preventing the optical fiber preform 110 from falling after the dummy rod portion 111 is accommodated.
- the arm portion 130 is a cylindrical member, and is engaged with the grip portion 60 of the hanger 50 when the adapter 120 is accommodated in the hanger 50 as described in the first embodiment.
- the position of the arm unit 130 is arranged above the holding unit 125, but is not limited to the upper side.
- the arm unit 130 may be held at the same height as the holding unit 125. It may be below the portion 125.
- the adapter 120 includes a dummy bar accommodating portion 121 that accommodates the dummy rod portion 111 of the optical fiber preform 110 from the side surface.
- a curved surface having an inner diameter that substantially matches the outer diameter of the dummy rod portion 111 of the optical fiber preform 110 is formed in the dummy rod housing portion 121, and this curved surface is formed by inserting the dummy rod portion 111 of the optical fiber preform 110 through the opening 123.
- a semicircular shape is used so as to enter the rod accommodating portion 121 and stably accommodate thereafter.
- the dummy rod accommodating portion 121 is formed with a holding portion 125 that is an annular protrusion having a shape that matches the annular recess 112.
- the lid part 140 is attached to the adapter 120 in order to prevent the optical fiber preform 110 from falling after accommodating the dummy bar part 111.
- the lid 140 is attached to the mounting holes 126 and 127 of the adapter 120 by set screws 141 and 142.
- the materials of the adapter 120 and the lid 140 are the same as those in the first embodiment.
- FIGS. 1-10 A state where the optical fiber preform 110 is attached to the adapter 120 will be described with reference to FIGS.
- the adapter 120 is moved toward the dummy rod portion 111 of the optical fiber preform 110.
- the annular recess 112 formed in the dummy rod portion 111 is fitted into the holding portion 125 of the adapter 120, and the dummy rod portion 111 is accommodated in the dummy rod accommodating portion 121.
- the lid portion 140 is mounted in the mounting holes 126 and 127 of the adapter 120 with the set screws 141 and 142.
- the optical fiber preform 110 is engaged with the adapter 120.
- the optical fiber preform 110 is held by the adapter 120 (engagement mechanism) provided with the arm portion 130 by using the groove-like suspension portion 112 formed in advance on the optical fiber preform 110.
- the arm portion having sufficient strength can be coupled to the engagement mechanism, so that the optical fiber preform can be easily carried in and the optical fiber preform can be securely placed in the drawing furnace. Can do.
- FIG. 11 is a perspective view for explaining the outline of the dummy rod portion on the optical fiber preform in the fourth embodiment of the present invention.
- FIG. 12 is a perspective view showing an outline of an adapter (joining mechanism) in the fourth embodiment of the present invention.
- FIG. 13 is an explanatory diagram showing a procedure for attaching an adapter (joining mechanism) to the optical fiber preform (dummy rod portion) in the fourth embodiment of the present invention.
- the fourth embodiment of the present invention is different from the first and third embodiments in the joining of the optical fiber preform and the adapter (joining mechanism), and is engaged with the hanger (engaging mechanism) (first embodiment).
- Mode) and attitude adjustment of the optical fiber preform (second embodiment) are the same as those described in the first or second embodiment, and the description thereof is omitted.
- the fourth embodiment of the present invention includes an adapter (joining mechanism) 220 attached to a dummy bar portion 211 connected to the upper part of an optical fiber preform 210, and a hanger (engaging mechanism) 50 with which the adapter 220 is engaged. Consists of. There may be a cover (cover portion) 70 that covers the adapter 220 and the dummy rod portion 211 after the dummy rod portion 211 is accommodated in the hanger 50. A through-hole 212 (suspension portion) is formed in the dummy bar portion 211 in a direction orthogonal to the vertical direction in FIG.
- the adapter 220 includes two arm portions 230 having guide holes 231 that extend to both sides of the through hole 212 of the dummy rod portion 211 and communicate with the opening of the through hole 212, and the dummy rod portion 11. It comprises a connecting member 240 that covers at least part of the periphery and connects the arm portions 230 on both sides.
- the connecting member 240 includes a dummy bar accommodating portion 241 that couples the two arm portions 230 at both ends and accommodates the dummy rod portion 211 of the optical fiber preform 210 from the side surface.
- the dummy rod housing portion 241 is formed with a curved surface having an inner diameter that substantially matches the outer diameter of the dummy rod portion 211 of the optical fiber preform 210.
- a semicircular portion 243 is formed so as to be an opening 242 for entering the head.
- a straight portion 244 that extends tangentially from the end of the semicircular portion 243 is formed, and the arm portion 230 is connected to a part of the semicircular portion 243 and the straight portion 244.
- the guide hole 231 is drilled so as to communicate with the through-hole 212 of the dummy bar portion 211, and the centers of the guide holes 231 drilled in the two arm portions 230 are formed to coincide with each other.
- FIG. 13A a procedure for attaching the adapter 220 to the optical fiber preform 210 will be described.
- the adapter 220 is moved in the direction of the arrow toward the dummy rod portion 211 of the optical fiber preform 210.
- the dummy bar portion 211 is accommodated in the dummy rod accommodating portion 241 so that the through hole 212 formed in the dummy rod portion 211 and the guide hole 231 of the adapter 220 communicate with each other.
- a pin 232 (holding part) is inserted from the guide hole 231, and the pin 232 is accommodated in the guide hole 231 and the through hole 212 of the arm part 230 on both sides.
- FIG. 13C the optical fiber preform 210 and the adapter 220 are engaged.
- the optical fiber preform 210 can be supported by the adapter 220 having sufficient strength. It is possible to prevent time drop and the like and maintain a stable state even in the drawing furnace.
- the suspension portion is a through-hole and the holding portion is a pin that is inserted into the through-hole, so that the joining mechanism is engaged with the through-hole of the dummy rod portion connected to the upper portion of the optical fiber preform in advance by the pin.
- the holding portion is a pin that is inserted into the through-hole, so that the joining mechanism is engaged with the through-hole of the dummy rod portion connected to the upper portion of the optical fiber preform in advance by the pin.
- Such a configuration can be coupled to the engagement mechanism using an arm portion having sufficient strength, so that the optical fiber preform can be easily carried in and the optical fiber preform is reliably disposed in the drawing furnace. be able to.
- the size of the adapter can be reduced as compared with the first and third embodiments, and a configuration that does not require a lid can be achieved.
- FIG. 14 is a perspective view for explaining the outline of the dummy rod portion on the optical fiber preform in the fifth embodiment of the present invention.
- FIG. 15 is a perspective view showing an outline of an adapter (joining mechanism) in the fifth embodiment of the present invention.
- the fifth embodiment of the present invention differs from the first, third, and fourth embodiments in the joining of an optical fiber preform and an adapter (joining mechanism), and is engaged with a hanger (engaging mechanism) (
- the first embodiment) and the attitude adjustment of the optical fiber preform (second embodiment) are the same as those described in the first or second embodiment, and the description thereof is omitted.
- an adapter (joining mechanism) 320 attached to a dummy rod portion 311 connected to an upper portion of an optical fiber preform 310, and a hanger (engaging mechanism) 50 with which the adapter 320 is engaged, Consists of.
- a cover (cover portion) 70 that covers the adapter 320 and the dummy rod portion 311 after the dummy rod portion 311 is accommodated in the hanger 50.
- the outer periphery convex part 312 (suspension part) is formed in two places on the periphery of the direction orthogonal to the up-down direction of FIG.
- the convex shape may be any shape as long as a step is formed, and is not limited to the rectangular groove as shown in FIG. 14, and may be a semicircular shape in a sectional view.
- the adapter 320 covers at least a part of the periphery of the dummy bar portion 311 and is engaged with the arm portion 330 and the outer peripheral convex portion 312 (suspension portion) extending on both sides in the direction orthogonal to the drawing direction.
- a holding portion 325 for holding the optical fiber preform 310 is provided.
- the adapter 320 includes a dummy bar accommodating portion 321 that accommodates the dummy rod portion 311 of the optical fiber preform 310 from the side surface.
- a curved surface having an inner diameter that substantially matches the outer diameter of the dummy rod portion 311 of the optical fiber preform 310 is formed in the dummy rod housing portion 321, and this curved surface allows the dummy rod portion 311 of the optical fiber preform 310 to be dummy from the opening 323.
- a semicircular shape is used so as to enter the rod accommodating portion 321 and stably accommodate thereafter.
- the dummy bar accommodating portion 321 is formed with a holding portion 325 that is an annular groove having a shape that coincides with the two outer peripheral convex portions 312 at positions facing each other on the circumference.
- the holding portion 325 is provided with a space 326 having a level difference on the back side with respect to the entry direction to the dummy bar accommodating portion 321, and the outer peripheral convex portion 312 is fitted into the space 326.
- the holding portion 325 has a step, and the outer peripheral convex portion 312 is accommodated in the space 326 on the lower side of the step, thereby preventing the optical fiber preform 310 from dropping due to vibration or the like. Therefore, the optical fiber preform 310 can be held without requiring a lid.
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Abstract
Description
最初に本発明の実施態様を列記して説明する。
(1)本発明の一実施態様は、光ファイバ母材を線引炉へ搬入するための懸架構造であって、前記線引炉へ搬入される前記光ファイバ母材の上部に接続されたダミー棒部には、凹状もしくは凸状または孔からなる懸架部が形成されており、前記ダミー棒部の周囲の少なくとも一部を覆い、線引方向と直交する方向の両側に延出した腕部、および前記懸架部と係合して前記光ファイバ母材を保持する保持部、を有する接合機構と、前記腕部が係合されて前記光ファイバ母材を吊り下げる把持部を有する係合機構と、を備える構成としている。
次に、図面を参照しながら、本発明の光ファイバ母材の懸架構造および懸架方法に係る好適な実施形態について説明する。以下の説明において、異なる図面においても同じ符号を付した構成は同様のものであるとして、その説明を省略する場合がある。
図1は、本発明の第1実施形態における光ファイバ母材上部のダミー棒部の概略を説明する斜視図である。図2は、本発明の第1実施形態におけるアダプタ(接合機構)の概略を示した斜視図である。図3は、本発明の第1実施形態において光ファイバ母材(ダミー棒部)にアダプタ(接合機構)を取り付けた状態を示した説明図である。図4は、本発明の第1実施形態におけるハンガー(係合機構)とカバーの概略を説明する斜視図である。なお、図3においては煩雑さを回避するために、説明に必要な符号のみを記載しており、詳しくは図1、2,4を参照する。
次に、図面を参照しながら、本発明の第2実施形態について説明する。以下の説明において、第1の実施形態において説明した同じ符号を付した構成は同様のものであるとして、その説明を省略する場合がある。図5は、本発明の第2実施形態におけるカバーの概略を説明する斜視図である。図6は、本発明の第2実施形態における揺動部材の概略を説明する斜視図である。図7は、本発明の第2実施形態において、光ファイバ母材(ダミー棒部)の姿勢調整について概略を説明する図である。
次に、図面を参照しながら、本発明の第3実施形態について説明する。以下の説明において、第1または第2の実施形態において説明した同じ符号を付した構成は同様のものであるとして、その説明を省略する場合がある。図8は、本発明の第3実施形態における光ファイバ母材上部のダミー棒部の概略を説明する斜視図である。図9は、本発明の第3実施形態におけるアダプタ(接合機構)の概略を示した斜視図である。図10は、本発明の第3実施形態において光ファイバ母材(ダミー棒部)にアダプタ(接合機構)を取り付けた状態を示した説明図である。
次に、図面を参照しながら、本発明の第4実施形態について説明する。以下の説明において、第1から第3の実施形態において説明した同じ符号を付した構成は同様のものであるとして、その説明を省略する場合がある。図11は、本発明の第4実施形態における光ファイバ母材上部のダミー棒部の概略を説明する斜視図である。図12は、本発明の第4実施形態におけるアダプタ(接合機構)の概略を示した斜視図である。図13は、本発明の第4実施形態において光ファイバ母材(ダミー棒部)にアダプタ(接合機構)を取り付ける手順を示した説明図である。
次に、図面を参照しながら、本発明の第5実施形態について説明する。以下の説明において、第1から第4の実施形態において説明した同じ符号を付した構成は同様のものであるとして、その説明を省略する場合がある。図14は、本発明の第5実施形態における光ファイバ母材上部のダミー棒部の概略を説明する斜視図である。図15は、本発明の第5実施形態におけるアダプタ(接合機構)の概略を示した斜視図である。
Claims (15)
- 光ファイバ母材を線引炉へ搬入するための懸架構造であって、
前記線引炉へ搬入される前記光ファイバ母材の上部に接続されたダミー棒部には、凹状もしくは凸状または孔からなる懸架部が形成されており、
前記ダミー棒部の周囲の少なくとも一部を覆い、線引方向と直交する方向の両側に延出した腕部、および前記懸架部と係合して前記光ファイバ母材を保持する保持部、を有する接合機構と、
前記腕部が係合されて前記光ファイバ母材を吊り下げる把持部を有する係合機構と、
を備える、懸架構造。 - 前記懸架部は、前記ダミー棒部の周上で均等に形成されている凸状の環形状または球形状であり、
前記保持部に前記環形状または球形状が嵌入される、請求項1に記載の懸架構造。 - 前記懸架部は、前記ダミー棒部の周上で均等に形成されている凹状の溝であり、
前記保持部が前記溝に嵌入される、請求項1に記載の懸架構造。 - 前記懸架部は、貫通孔であり、
該貫通孔は、前記線引炉へ搬入される前記光ファイバ母材の上部に接続されたダミー棒部の線引方向と直交するように形成されており、
前記腕部には前記貫通孔と連通する案内孔が形成され、
前記保持部が、前記貫通孔及び前記案内孔に挿通されるピンである、請求項1に記載の懸架構造。 - 前記係合機構は、前記線引炉上に予め吊り下げられた支持棒の下端に取り付けられており、前記光ファイバ母材が係合された前記接合機構の一部を収容する収容部を備え、
前記把持部は、該収容部の両側それぞれに延出され、先端が鍵状に形成され、収容された前記接合機構を係止する係止部、および前記腕部材を載置する載置部を備える、請求項1から4のいずれか1項に記載の懸架構造。 - 前記係合機構には、前記ダミー棒部の側面を臨む側受面が形成され、
前記線引方向と直交する方向に所定の曲率を有した凸状の面を備えた揺動部材が、該凸状の面と前記側受面とが接するように前記係合機構に揺動自在に取り付けられており、
前記揺動部材の前記ダミー棒部、もしくは前記接合機構の側面を臨む側には、前記ダミー棒部、もしくは前記接合機構の側周面の曲率を有した凹状の母材受け面が形成されている、請求項1から5のいずれか1項に記載の懸架構造。 - 前記揺動部材は、前記係合機構に遊嵌されている、請求項6に記載の懸架構造。
- 前記係合機構に係合された前記接合機構を覆い、前記係合機構に装着されるカバー部を備える、請求項1から7のいずれか1項に記載の懸架構造。
- 前記カバー部は、前記光ファイバ母材の側面を臨む囲繞部を備え、
該囲繞部には、前記線引方向に対して互いに異なる方位角方向に伸縮して前記光ファイバ母材の姿勢を調整する調整部が備えられている、請求項8に記載の懸架構造。 - 前記調整部は、前記線引き方向に対して、前記腕部の上下に配されている、請求項9に記載の懸架構造。
- 少なくとも3つの前記調整部を備え、二つの前記調整部は、互いに略直角となる方位角になるように前記腕部の上側もしくは下側に配され、
一つの前記調整部は、前記二つの調整部に対して略中央の方位角となるように前記腕部の上側もしくは下側に配される、請求項9または10に記載の懸架構造。 - 前記調整部は、旋回によって前記方位角方向に移動自在なネジである、請求項9から11のいずれか1項に記載の懸架構造。
- 前記係合機構の前記接合機構を臨む側および前記カバーの前記接合機構を臨む側の一方もしくは両方には緩衝部材が備えられている、請求項8から12のいずれか1項に記載の懸架構造。
- 光ファイバ母材を線引炉へ搬入する懸架方法であって、
前記線引炉へ搬入される前記光ファイバ母材の上部に接続されたダミー棒部には、凹状もしくは凸状または孔からなる懸架部が形成されており、
前記ダミー棒部の周囲の少なくとも一部を覆い、線引方向と直交する方向の両側に延出した腕部、および前記懸架部と係合して前記光ファイバ母材を保持する保持部、を有する接合機構で前記光ファイバ母材を保持し、
前記腕部が前記光ファイバ母材を吊り下げる把持部を有する係合機構と係合される懸架方法。 - 請求項1から14のいずれか一項に記載の懸架構造を用いて光ファイバ母材を懸架し、線引炉内に前記光ファイバ用母材を挿入し、該光ファイバ用母材を前記線引炉内で加熱溶融して光ファイバを線引きする、光ファイバの製造方法。
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US16/498,490 US11214506B2 (en) | 2017-03-31 | 2018-03-29 | Suspension structure and suspension method for optical fiber preform and manufacturing method and suspension method for optical fiber |
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CN113526861A (zh) * | 2021-07-27 | 2021-10-22 | 长飞光纤潜江有限公司 | 一种光纤预制棒自动取料换料装置 |
CN113651526B (zh) * | 2021-08-02 | 2023-02-10 | 富通集团(嘉善)通信技术有限公司 | 芯棒的加工工艺 |
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JPWO2018181739A1 (ja) | 2020-05-14 |
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JP6992804B2 (ja) | 2022-01-13 |
CN110494399A (zh) | 2019-11-22 |
KR102442264B1 (ko) | 2022-09-08 |
US11214506B2 (en) | 2022-01-04 |
RU2745394C1 (ru) | 2021-03-24 |
KR20190131048A (ko) | 2019-11-25 |
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