WO2006064608A1 - 光ファイバ母材の延伸方法及びこれに用いる石英ダミー棒 - Google Patents
光ファイバ母材の延伸方法及びこれに用いる石英ダミー棒 Download PDFInfo
- Publication number
- WO2006064608A1 WO2006064608A1 PCT/JP2005/019230 JP2005019230W WO2006064608A1 WO 2006064608 A1 WO2006064608 A1 WO 2006064608A1 JP 2005019230 W JP2005019230 W JP 2005019230W WO 2006064608 A1 WO2006064608 A1 WO 2006064608A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical fiber
- quartz
- rough surface
- fiber preform
- dummy rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
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
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/0126—Means for supporting, rotating, translating the rod, tube or preform
Definitions
- the present invention relates to an optical fiber preform stretching method that stretches a large optical fiber preform to reduce the diameter to a smaller glass rod, and a quartz dummy rod used therefor, in particular, an optical fiber.
- the present invention relates to an optimum gripping method for stretching a base material.
- An optical fiber preform is manufactured by dehydrating and sintering a porous glass preform obtained by depositing glass fine particles (soot) synthesized by the OVD method or the like.
- the diameter of the optical fiber base material manufactured in this way is usually 110 to 200 mm.
- This is primarily stretched by a stretching apparatus equipped with an electric furnace as a heat source.
- the optically stretched optical fiber preform is further stretched secondarily with an oxyhydrogen flame and reduced to a diameter of 30 to 80 mm suitable for optical fiber drawing to form a preform. If the original optical fiber preform has a diameter of 120 mm or less, primary stretching by an electric furnace may be omitted, and the preform may be reduced to the final diameter only by drawing with a glass lathe. is there.
- a preform obtained by drawing with a glass lathe is required to have a small variation in diameter in the longitudinal direction.
- the diameter may vary in the longitudinal direction in the conventional method, and when the cause was investigated, there was a case where slip occurred at the grip portion of the chuck during the drawing of the optical fiber preform.
- FIG. 1 shows how the optical fiber preform 100 is drawn using a glass lathe 10.
- a quartz dummy rod 110 is connected to both ends of the optical fiber base material 100 by welding or the like, and the quartz dummy rod 110 is attached to the chuck 200 of the glass lathe 10.
- the glass lathe 10 includes a burner 300 as a heating source for the optical fiber preform 100 and an outer diameter measuring device 400 for measuring the outer diameter of the optical fiber preform 100 being processed.
- the heavy and large-diameter optical fiber preform 100 is stretched while being held horizontally, so that heat melting does not cause bending or deformation, and minimum heat melting. It is necessary to stretch with. Therefore, extremely large force is required for stretching.
- the surface of the quartz dummy rod 110 connected to the optical fiber preform 100 was smooth and slidable against the chuck 200.
- the effective contact area with the chuck 200 is small, and the holding is unstable.
- the quartz dummy rod 110 slides with respect to the chuck 200, and comes out of the chuck 200, creating a gap 220, and the stretching speed becomes unstable.
- the main factor was that the outer diameter was not stable.
- the present invention can stretch the optical fiber preform with a uniform diameter in the longitudinal direction without causing slippage in the gripping portion of the chuck 200 when the optical fiber preform is stretched using a glass lathe.
- An object of the present invention is to provide an optical fiber preform drawing method and a quartz dummy rod used therefor.
- the method for stretching an optical fiber preform of the present invention is a method in which an optical fiber preform is attached to a glass lathe, heated and melted, and stretched to a predetermined diameter.
- a quartz dummy rod having a rough surface portion provided by grinding the surface is connected, and the rough surface portion is gripped by a chuck of a glass lathe and stretched.
- the average surface roughness of the rough surface portion of the quartz dummy bar is preferably 1 ⁇ m or more and 50 m or less. This increases the friction on the surface of the rough surface and reduces the breakage of the dummy bar due to surface defects that occur when the rough surface is formed. Can be made. If the average surface roughness of the rough surface exceeds 50 m, the crack grows starting from the fine cracks generated on the ground surface, and the dummy bar tends to break. On the other hand, when the average surface roughness of the rough surface portion is less than 1 ⁇ m, not only sufficient friction cannot be obtained, but also labor is required to make the rough surface portion surface uniform.
- a straight body portion having a constant diameter in the longitudinal direction of the dummy rod is formed in the vicinity of the end portion of the quartz dummy rod. It is preferable to form a rough surface portion on the surface. This eliminates undulations on the surface of the dummy bar and increases the effective contact area between the dummy bar and the chuck, thereby stabilizing the holding.
- the end portion of the quartz glass rod whose diameter is changed in the longitudinal direction is ground to provide a straight body portion. It may be.
- tapered quartz rods with partially different diameters can also be used as dummy rods, contributing to a reduction in dummy rod procurement costs.
- the quartz dummy rod is a quartz that is connected to both ends of the optical fiber preform when the optical fiber preform is attached to a glass lathe, heated and melted to stretch the optical fiber preform to a predetermined diameter.
- Dummy bar force A rough surface for gripping with a chuck is provided by grinding.
- the average surface roughness of the rough surface portion of the quartz dummy rod is preferably 1 ⁇ m or more and 50 ⁇ m or less. As a result, the friction on the surface of the rough surface portion can be increased, and the breakage of the dummy rod due to the surface defect that occurs when the rough surface portion is formed can be reduced. If the average surface roughness of the rough surface exceeds 50 m, cracks grow starting from the fine cracks generated on the ground surface, and the dummy bar tends to break. On the other hand, if the average surface roughness of the rough surface portion is less than 1 ⁇ m, not only sufficient friction can be obtained, but also labor is required to make the rough surface surface uniform.
- the quartz dummy rod it is preferable that a straight body portion having a constant diameter in the longitudinal direction is provided in the vicinity of the end portion, and a rough surface portion is formed on the surface of the straight body portion. This eliminates the undulation of the dummy bar surface and increases the effective contact area between the dummy bar and the chuck, thereby stabilizing the holding.
- the quartz dummy rod may be provided with a straight body portion by polishing IJ of the end portion of the quartz glass rod whose diameter changes in the longitudinal direction. As a result, tapered quartz rods with partially different diameters can be used as dummy rods, which contributes to a reduction in dummy rod procurement costs.
- the stretching speed can be precisely controlled, and the optical fiber preform having a uniform diameter in the longitudinal direction. Or a preform is obtained.
- a quartz glass rod whose diameter changes in the longitudinal direction can be used as the quartz dummy rod, which contributes to a reduction in manufacturing cost.
- FIG. 1 is a diagram schematically showing the structure of a glass lathe 10 for drawing an optical fiber preform 100.
- FIG. 2 is a diagram for explaining a problem in a conventional gripping method 20 in a glass lathe 10
- FIG. 3 is a view showing a quartz dummy rod 110 having a rough surface portion 120.
- FIG. 4 is a view showing another quartz dummy rod 110 having a rough surface portion 12.
- FIG. 5 is a view showing a state 30 in which a quartz dummy rod 110 having a rough surface portion 120 is held by a chuck 200.
- FIG. 3 is a diagram showing a state in which the rough surface portion 120 is formed on the quartz dummy rod 110 having no diameter variation in the longitudinal direction. As shown in the figure, the rough surface portion 120 is formed on the surface in the vicinity of one end portion of the quartz dummy rod 110. The portions other than the rough surface portion 120 of the quartz dummy rod 110 are the smooth portions 130 while maintaining the original surface properties of the stone dummy rod 110.
- the optical fiber preform 100 is stretched while the optical fiber preform 100 is rotated, the optical fiber preform 100 and the quartz dummy rod 110 are connected in a state in which the central axes thereof coincide with each other. Is required. If the center axis is misaligned, the optical fiber preform 100 As a result, the rotation of the optical fiber is swung, and the stretched outer diameter of the optical fiber finally varies. Therefore, when the rough surface portion 120 is formed on the quartz dummy rod 110, it is desirable to grind the quartz dummy rod 110 so that the central axis of the rough surface portion 120 coincides with the central axis of the quartz dummy rod 110.
- the grinding process for forming the rough surface portion 120 is performed by, for example, cylindrical grinding using a diamond wheel of # 60 to # 140, so that the average surface roughness is 50 m or less on the surface of the quartz dummy rod 110.
- the rough surface portion 120 can be formed. If the average surface roughness of the rough surface portion 120 deviates from this range force, the desired effect cannot be obtained and the chuck 200 slips.
- FIG. 4 is a diagram showing a state in which the rough surface portion 120 is formed on the quartz dummy rod 110 whose diameter continuously changes in the longitudinal direction. That is, the quartz dummy rod 110 used here has a tapered outer shape whose outer diameter continuously changes in the longitudinal direction. On the other hand, when the rough surface portion 120 is formed, the surface of the quartz dummy rod 110 is further ground to make the quartz dummy rod 110 a cylindrical body without changing the diameter in the region where the rough surface portion 120 is formed.
- FIG. 4 shows a quartz dummy rod in which the portion 140 is formed and the surface thereof is a rough surface portion 120.
- FIG. 5 is a diagram showing a state 30 in which the quartz dummy rod 110 having the rough surface portion 120 is gripped by the chuck 200. As shown in the figure, since the chuck 200 grips the quartz dummy rod 110 at the rough surface portion 120! /, The quartz dummy rod 110 does not slide with respect to the chuck 200.
- the gripping surface of the chuck 200 that grips the optical fiber preform is desirably a curved surface having substantially the same curvature as the peripheral surface of the rough surface portion 120 of the dummy rod 110.
- the contact area between the chuck 200 and the rough surface portion 120 can be increased and gripping can be performed more reliably.
- the porous glass preform obtained by depositing soot by the VAD method was dehydrated and sintered to produce an optical fiber preform 100 having an outer diameter of 110 mm and a straight body length of 1,000 mm.
- a quartz dummy rod 110 having a diameter of 60 mm ⁇ and a length of 400 mm is welded to both ends of this optical fiber preform 100, attached to a glass lathe 10, heated and melted with an oxyhydrogen burner flame 300, and an average drawing speed of 13 mmZ min. It was stretched and reduced in diameter to 85mm ⁇ .
- the quartz dummy rod 110 has a # 100 diamond.
- a rough surface portion 120 having an average surface roughness of 25 ⁇ m is provided by cylindrical grinding using a Monde wheel.
- the porous glass preform obtained by depositing soot by the VAD method was dehydrated and sintered to produce an optical fiber preform having an outer diameter of 110 mm, a straight barrel length of l, and OOOOmm.
- a stone dummy rod 110 having a length of 400 mm and a taper shape in which the diameter gradually decreases to a diameter of 60 mm, a force of 55 mm, and a diameter of 55 mm was prepared.
- the vicinity of the large-diameter end of the quartz dummy rod 110 was cylindrically ground with a # 100 diamond wheel to form a straight body 140 having a constant diameter over a length of 100 mm.
- a rough surface portion 120 having an average surface roughness of 25 m was formed on the surface of the straight body portion 140. Furthermore, the end on the small diameter side of the quartz dummy rod 110 is welded to both ends of the optical fiber preform 100 and attached to the glass lathe 10, heated and melted with a flame of an oxyhydrogen burner 300, and an average drawing speed of 13 mmZ It was stretched in minutes to reduce the diameter to 85 mm. When the diameter variation in the longitudinal direction of the optical fiber preform 100 after the diameter reduction was examined, the occurrence rate of defective products was reduced and the quality was stable.
- a preform having a uniform diameter in the longitudinal direction can be obtained, and the manufacturing cost can be reduced.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004364662A JP4395061B2 (ja) | 2004-12-16 | 2004-12-16 | 光ファイバ母材の延伸方法及びこれに用いる石英ダミー棒 |
| JP2004-364662 | 2004-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006064608A1 true WO2006064608A1 (ja) | 2006-06-22 |
Family
ID=36587672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2005/019230 Ceased WO2006064608A1 (ja) | 2004-12-16 | 2005-10-19 | 光ファイバ母材の延伸方法及びこれに用いる石英ダミー棒 |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4395061B2 (ja) |
| TW (1) | TW200624398A (ja) |
| WO (1) | WO2006064608A1 (ja) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103241936A (zh) * | 2012-02-09 | 2013-08-14 | 信越化学工业株式会社 | 玻璃母材延伸方法 |
| US10590022B2 (en) | 2015-01-22 | 2020-03-17 | Heraeus Quartz North America Llc | Formation of elongated glass components with low bow using a gripper device |
| CN114075034A (zh) * | 2020-08-19 | 2022-02-22 | 信越化学工业株式会社 | 光纤用玻璃母材及光纤用玻璃母材的拉伸方法 |
| EP4497731A1 (en) * | 2023-07-28 | 2025-01-29 | ASML Netherlands B.V. | Manufacturing a hollow core photonic crystal fiber |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6116617B2 (ja) * | 2015-05-29 | 2017-04-19 | 株式会社フジクラ | 光ファイバ母材用ダミー棒、そのダミー棒を使用した光ファイバ母材の延伸方法および光ファイバ素線の製造方法 |
| CN114212989B (zh) * | 2021-11-30 | 2023-07-28 | 浙江富通光纤技术有限公司 | 预制棒的加工工艺以及光纤 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000086263A (ja) * | 1998-07-01 | 2000-03-28 | Shin Etsu Chem Co Ltd | 光ファイバ母材の加工方法及び加工装置 |
| JP2001138112A (ja) * | 1999-11-17 | 2001-05-22 | Kayaba Ind Co Ltd | チャック部材の表面処理方法並びに表面構造 |
| JP2002037640A (ja) * | 2000-07-24 | 2002-02-06 | Shin Etsu Chem Co Ltd | 光ファイバ母材の延伸装置 |
-
2004
- 2004-12-16 JP JP2004364662A patent/JP4395061B2/ja not_active Expired - Fee Related
-
2005
- 2005-10-19 WO PCT/JP2005/019230 patent/WO2006064608A1/ja not_active Ceased
- 2005-10-26 TW TW094137435A patent/TW200624398A/zh unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000086263A (ja) * | 1998-07-01 | 2000-03-28 | Shin Etsu Chem Co Ltd | 光ファイバ母材の加工方法及び加工装置 |
| JP2001138112A (ja) * | 1999-11-17 | 2001-05-22 | Kayaba Ind Co Ltd | チャック部材の表面処理方法並びに表面構造 |
| JP2002037640A (ja) * | 2000-07-24 | 2002-02-06 | Shin Etsu Chem Co Ltd | 光ファイバ母材の延伸装置 |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103241936A (zh) * | 2012-02-09 | 2013-08-14 | 信越化学工业株式会社 | 玻璃母材延伸方法 |
| US20130205833A1 (en) * | 2012-02-09 | 2013-08-15 | Shin-Etsu Chemical Co., Ltd. | Glass base material elongating method |
| US9493374B2 (en) * | 2012-02-09 | 2016-11-15 | Shin-Etsu Chemical Co., Ltd. | Glass base material elongating method |
| US10590022B2 (en) | 2015-01-22 | 2020-03-17 | Heraeus Quartz North America Llc | Formation of elongated glass components with low bow using a gripper device |
| CN114075034A (zh) * | 2020-08-19 | 2022-02-22 | 信越化学工业株式会社 | 光纤用玻璃母材及光纤用玻璃母材的拉伸方法 |
| US12623948B2 (en) | 2020-08-19 | 2026-05-12 | Shin-Etsu Chemical Co., Ltd. | Optical fiber glass preform and method for drawing optical fiber glass preform |
| EP4497731A1 (en) * | 2023-07-28 | 2025-01-29 | ASML Netherlands B.V. | Manufacturing a hollow core photonic crystal fiber |
| WO2025026634A1 (en) * | 2023-07-28 | 2025-02-06 | Asml Netherlands B.V. | Manufacturing a hollow core photonic crystal fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006169049A (ja) | 2006-06-29 |
| JP4395061B2 (ja) | 2010-01-06 |
| TW200624398A (en) | 2006-07-16 |
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