WO2005105683A1 - 光ファイバおよびプリフォームの製造方法 - Google Patents
光ファイバおよびプリフォームの製造方法 Download PDFInfo
- Publication number
- WO2005105683A1 WO2005105683A1 PCT/JP2004/006063 JP2004006063W WO2005105683A1 WO 2005105683 A1 WO2005105683 A1 WO 2005105683A1 JP 2004006063 W JP2004006063 W JP 2004006063W WO 2005105683 A1 WO2005105683 A1 WO 2005105683A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- quartz glass
- glass tube
- optical fiber
- core rod
- outer diameter
- Prior art date
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
- C03B37/02—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
- C03B37/02772—Fibres composed of different sorts of glass, e.g. glass optical fibres shaping the preform lower end or bulb, e.g. pre-gobbing, controlling draw bulb shape, or preform draw start-up procedures
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B20/00—Processes specially adapted for the production of quartz or fused silica articles, not otherwise provided for
-
- 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
- C03B37/01251—Reshaping the ends
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/47—Shaping the preform draw bulb before or during drawing
Definitions
- the present invention relates to a method for producing an optical fiber and a preform by a load-in-tube method.
- the main method of manufacturing quartz glass optical fiber is the VAD (Vapor Shaft) method.
- the ECC can be improved by reducing the clearance (difference between the inner diameter of the quartz glass tube and the outer diameter of the cord).
- the clearance allowed by the standardization of the standard is reduced, and the size and length of the base material are increased. This makes it difficult to insert the core rod without contacting the quartz glass tube. If the core rod comes into contact with the inner wall of the quartz glass tube when the core rod is inserted, the contact part will be scratched, causing bubbles at the weld interface, causing fluctuations in the fiber diameter and deterioration in the frequency of breakage.
- a core rod is placed inside the quartz glass tube.
- a method of fixing the core with a spacer or partially welding it as disclosed in Japanese Patent Application Laid-Open No. 62-59546 is proposed.
- the inner surface of the quartz glass tube is contaminated or roughened by heat, so that bubbles are generated at the welding interface between the quartz glass tube and the core rod. This may cause fluctuations in the fiber diameter and deterioration of the breaking frequency.
- Japanese Patent Application Laid-Open No. 62-59547 proposes a method in which the quartz glass tube and the core rod are aligned only on the welding end side and the core rod at the welding start end is kept in non-contact. '.
- This method is easy to carry out and costs can be reduced because after inserting the core rod into a quartz glass tube that has been cleaned and cleaned, it is sufficient to fix the core rod only at the upper part where heat is not received.
- the quartz glass tube and the core rod were aligned and fixed by this method, the effect of suppressing BCC was not seen when a quartz glass tube with a simply cut lower end shape was used. .
- a composite base material in which an alloy is introduced into a quartz glass tube is charged from the upper part of the heating furnace, is heated and melted and integrated, and is stretched.
- a minimum processing is applied to the lower end of the quartz gaffs tube to minimize
- the aim is to provide a method for producing optical fibers and preforms that can achieve good ECC ar- eas while having a wide clearance that reduces the difficulty of insertion and insertion.
- the lower end portion including the first melt-down portion of the quartz glass tube has an outer periphery and an inner periphery.
- the amount of misalignment with the straight body is 1% or less of the outer diameter of the straight body of the quartz glass tube, and the maximum thickness and the minimum thickness of each section in all the cross-sections including the tapered section.
- the difference in thickness is 1.5 nu of the average thickness.
- the composite base material vertically, and heat the lower end.
- the lower end portion of the quartz glass tube including the first melt-through portion is formed.
- the outer and inner perimeters are substantially circular, and the outer diameter of the taper is reduced toward the tip as a whole.
- the amount of misalignment between the center and the straight body of the quartz glass tube is 1 of the outer diameter of the straight body of the quartz glass tube.
- a method of manufacturing a U-form for an optical fiber characterized in that a quartz glass tube is used, and a quartz crow tube and at least a lower end of a core rod are aligned and fixed.
- Fig. 1 shows the state of the start of melting of a quartz gauze tube when an optical fiber is manufactured by a conventional fiber manufacturing method.
- 2 (a) and 2 (b) show examples in which the tip of a quartz glass tube is machined according to the embodiment of the invention.
- Fig. 3 shows another example of processing the tip of a quartz glass tube according to the present invention.
- FIG. 4 is a view showing still another example in which the tip of a quartz glass tube is processed according to the embodiment of the present invention.
- FIG. 5 is a diagram for explaining the amount of misalignment between the center of the circle of the average outer diameter and the straight body portion of the quartz glass in each cross section of the tapered portion.
- Fig. 6 is a diagram for explaining the maximum thickness and minimum thickness at each cross-section in all the cross-sections including the tapered portion of the quartz glass tube.
- FIG. 7 is an explanatory view for explaining an embodiment in the case of manufacturing a pre-ohm according to the embodiment of the present invention.
- the core including only the core or a part of the clad is replaced with a quartz quartz for cladding.
- the base material formed by inserting it into the tube is placed vertically, and the lower end is heated to melt off, and the core tube and the quartz glass tube are fused together.
- Conventional optical fibers and platforms that start stretching can be used.
- a method of manufacturing a quartz glass tube is disclosed in Japanese Patent Application Laid-Open No. 07-11091, the applicant of which is one of the applicants. Can be used.
- the lower end portion of the quartz glass tube including the first melt-down portion has a tapered shape in which the outer periphery and the inner periphery are substantially circular, and the outer diameter thereof is reduced toward the tip as a whole. And the amount of misalignment between the center of the circle of the average outer diameter and the straight body of the quartz glass tube in each section of the tapered portion is 1 ° ⁇ or less of the outer diameter of the straight body of the quartz glass tube.
- a quartz glass tube having a shape is used.
- the outer periphery of the quartz glass tube may be machined into a tapered shape to form a tapered shape.
- This processing can be easily performed with an NC lathe.
- reference numeral 2 indicates a core rod.
- the quartz glass tube may be sealed in a tapered shape by thermal processing as shown in FIG.
- This processing can be easily performed by setting a long quartz glass tube on a glass lathe, melting the processed part by the heat of a burner or an electric furnace, and fusing it. In this case as well, it is necessary to prevent the core of the tapered sealing portion from being shifted from the core of the quartz glass tube.
- an opening may be provided at the tip as shown in (c) of FIG. 2 to facilitate cleaning of the inner surface of the quartz glass tube.
- the above (b) and (c) are examples of shapes in which the inner diameter of the tapered portion of the quartz glass tube is also reduced toward the tip.
- reference numeral 10 denotes a quartz glass tube
- reference numeral 12 denotes a wheel-type grindstone
- reference numeral 14 denotes a mode of movement of the grindstone.
- the amount of misalignment between the center of the circle of the average outer diameter and the straight body of the quartz glass tube in each cross section of the tapered portion is defined as follows. As shown in the right figure of Fig. 5, for the straight body of the quartz glass tube, for example, at three places (at least two places) a, b, and c, the center of a perfect circle whose outer diameter is the average outer diameter is obtained for each cross section. The center of each section.
- the straight line passing through the center of the two sections is taken as the centerline 30 of the straight body of the quartz glass tube.
- a straight line that minimizes the difference from the center of all the cross sections is obtained using the least squares method or the like, and this may be set as the center line 30.
- the center of each cross-section is determined in the same way at several cross-sections, for example, d1 to d3 in Fig. 5, and the center line of the quartz glass tube straight body previously determined
- the amount of deviation from 30 is calculated, and this amount of deviation is expressed as a percentage of the average outer diameter of the straight body of the quartz glass tube, and the maximum value is regarded as the amount of deviation.
- reference numeral 32 denotes, for example, an actual outer diameter shape at the d1 cross section of the left figure
- reference numeral 34 denotes a perfect circle having an average outer diameter obtained from the outer diameter shape 32
- reference numeral 3 denotes a circle.
- Reference numeral 6 denotes the center of the perfect circle 34
- reference numeral 38 denotes the amount of misalignment between the center line 30 of the straight body of the quartz glass tube in this cross section.
- the difference between the maximum wall thickness and the minimum wall thickness of each section including the tapered portion of the quartz glass tube used is 1.5% or less of the average wall thickness. It is necessary to be. If the difference between the maximum thickness and the minimum thickness in each section exceeds the above value, the intended purpose of the present invention of reducing ECC tends to be impossible to achieve as described above.
- the difference between the maximum thickness and the minimum thickness of each section of all sections of the quartz glass tube including the tapered section was obtained by subtracting the minimum thickness Mn from the maximum thickness Mx. Things.
- the outer diameter and / or the inner diameter of the tapered portion of the quartz glass tube to be used may have a step change or a step change in both diameters.
- the core rod and the quartz glass tube are fused and integrated at the same time as the fusion and integration, and the optical fiber is stretched to a target optical fiber diameter to obtain a direct optical fiber.
- fusion of the integrated welding of the core rod and the quartz glass tube An optical fiber may be obtained by forming a preform by stretching at the same time as the integration and by using a drawing machine from the preform.
- a quartz glass tube having an outer diameter of about 100 to 250 mm and an inner diameter of about 40 to 70 mm has a clearance of about 4 to 20 mm.
- An ECC of 0.2 ⁇ m or less can be achieved even with an outer diameter core rod.
- Japanese Patent Application Laid-Open No. 2003-340440 discloses a method for tapering the tip of an optical fiber preform, which is drawn simultaneously with welding of a quartz glass tube and a core rod.
- Japanese Patent Application Laid-Open No. 2002-80238 concerning a preform defines a longitudinal shape.
- these inventions are aimed at reducing the total loss and the loss time, and have completely different purposes from the present invention.
- An object of the present invention is to reduce ECC by using a tapered shape, and dimensional accuracy of a circumferential method of a tapered shape portion is important.
- a method in which a portion that does not melt and deform is provided at the tip end, that is, if the melting start position is set sufficiently above the tip end, the effect that the lower end of the portion that does not deform and deform at the lower end is reduced is reduced, as in the present invention. There is no need to process the tip. However, the loss of the quartz glass tube in the portion of the tip that does not melt and deform increases, resulting in higher costs and increased waste quartz glass.
- the cores of the quartz glass tube and the core rod be aligned at least at the lower end, but it is appropriate to align the cores other than at the lower end. Even so, the impact is small.
- the lower end of a quartz glass tube having an outer diameter of 180 mm and an inner diameter of 52 mm was machined into a tapered shape at an angle of 40 ° to the outer surface.
- the deviation between the core of the tapered portion after grinding and the core of the quartz glass tube is 0.5% of the outer diameter in all cross sections, and the maximum and minimum thicknesses in each cross section of the tapered shape are Was 0.8% of the average thickness.
- a core rod with an outer diameter of 40 mm created by the VAD method was inserted.
- the clearance between the core rod and the quartz glass tube is 12 mm (6 mm on one side), and when the core rod is inserted into the quartz glass tube, the outer surface of the core rod is made of the quartz glass tube. It could be inserted without rubbing against the inner surface.
- the core rod 2 and the core of the quartz glass tube were precisely aligned as shown in Fig. 7, and the metal jig 40 was used to fix the quartz glass tube 1 at the upper two locations 40a and 40b.
- the lower end of the composite base material is held in an electric furnace, and the lower end of the composite base material is melted and discharged.
- the outer diameter is 90 mm, extending simultaneously with the quartz glass tube and the core rods.
- Preform was obtained.
- the ECC was 0.14 m, which was a good value.
- the lower end of a quartz glass tube having an outer diameter of 200 nm and an inner diameter of 50 mm was melted using an oxyhydrogen burner, and was sealed into a tapered shape.
- the gap between the core of the tapered portion after sealing and the core of the quartz glass tube is 0.9 mm in outer diameter in all cross sections, and all except the portion where the hole of the tapered portion is closed
- the difference between the maximum thickness and the minimum thickness in the cross section was 1.3% of the average thickness.
- a core with an outer diameter of 35 mm created by the VAD method was inserted.
- the clearance between the core and the quartz glass tube is 15 mm (7.5 mm on one side), and when the core rod is inserted into the quartz glass tube, the outer surface of the core opening is the quartz glass tube.
- Insertion was possible without rubbing on the inner surface.
- the core rod and the quartz glass tube core were precisely aligned and fixed at the upper two positions of the quartz glass tube.
- the lower end of the quartz glass tube was held in an electric furnace, and was waited for it to melt down before exiting. Then, it was drawn simultaneously with the quartz glass tube and the core rod collabs to directly produce an optical fiber with an outer diameter of 125 m.
- the lower end of a quartz glass tube having an outer diameter of 160 mm and an inner diameter of 50 mm was melted using an oxyhydrogen burner, and sealed to a tapered shape.
- the tip was cut so as to make a hole with a diameter of 10 mm, which was used as a drain hole for washing the quartz glass tube.
- the deviation between the core of the tapered portion after grinding and the core of the quartz glass tube is 0.5.0 ° of the outer diameter in all sections, and the maximum and minimum thicknesses at each section of the tapered portion. The difference from the average thickness was 0.8%.
- a core rod with an outer diameter of 35 mm created by the VAD method was inserted.
- the clearance between the core rod and the quartz glass tube is 15 mm (7.5 mm on one side) .
- the outer surface of the core rod is the inner surface of the quartz glass tube. It could be inserted without rubbing.
- the core rod and the quartz glass tube core were precisely aligned and fixed at the upper two positions of the quartz glass tube. The lower end of the quartz glass tube was held in an electric furnace, and the material was allowed to come out after being melted down. Then, a preform with an outer diameter of 6 O mm was drawn simultaneously with the quartz glass tube and the core rod collabs, and an optical fiber with an outer diameter of 125 ⁇ m was obtained by a wire drawing machine. Was a good value of 0.12; ni.
- a 0 mm core rod was inserted.
- the clearance between the core rod and the quartz glass tube is 12 mm (6 mm on one side) as in the example.
- the core rod and the quartz glass tube were precisely aligned and the core rod was fixed at the top two places of the quartz glass tube.
- the lower end of the quartz glass tube was held in an electric furnace, and Then, it was drawn out and stretched at the same time as the quartz glass tube and the cored collabs to obtain a preform with an outer diameter of 9 mm.
- An optical fiber with an outer diameter of 125 ⁇ m was prepared from this preform using an optical fiber drawing machine, and the ECC was measured. The result was 0.61 ⁇ m, which was a bad value.
- Example 3 the lower end of a quartz glass tube having an outer diameter of 16 Om and an inner diameter of 5 Om was melted by using an oxyhydrogen burner, and was sealed into a tapered shape.
- the tip was cut so as to have a hole with a diameter of 10 mm to make a drainage hole for washing the quartz glass tube.
- the deviation between the core of the tapered portion after grinding and the core of the quartz glass tube is 1.2% of the outer diameter in all cross sections, and the maximum and minimum thicknesses in each cross section of the tapered shape are Was 0.7% of the average thickness.
- a core rod with an outer diameter of 35 mm created by the VAD method was inserted.
- the clearance between the core rod and the quartz glass tube is 15 mm (7.5 mm on each side).
- the core rod and the quartz glass tube core are precisely aligned and fixed at the upper two places of the quartz glass tube, the lower end of the quartz glass tube is held in an electric furnace, and after being melted down, the quartz glass tube is taken out and put out.
- a preform with an outer diameter of 60 mm was prepared by stretching simultaneously with the cored collabs, and an optical fiber with an outer diameter of 125 m was obtained using a wire drawing machine.
- ECC was 0.228; tim, which was not a good value.
- Example 2 the lower end of a quartz glass tube having an outer diameter of 20 Omm and an inner diameter of 5 Omm was melted by using an oxygen hydrogen wrench, and was sealed into a tapered shape.
- the deviation between the core of the tapered portion after sealing and the core of the quartz glass tube is 0.8 in the outer diameter in all cross sections. %, And the difference between the maximum thickness and the minimum thickness in all the cross-sections except the portion where the hole of the tapered portion was closed was 1.7 of the average thickness.
- a core lock H with an outer diameter of 35 mm created by the VAD method was inserted.
- the clearance between the core opening and the quartz glass tube is 15 mm (7.5 mm on each side).
- Example 2 As in Example 1, the lower end of the quartz glass tube and the quartz glass tube were held in an electric furnace, and waited for them to melt down. Then, they were drawn out and stretched simultaneously with the collapse of the quartz glass tube and the core rod. Optical fins with a diameter of 125 m were created directly. The ECC of the obtained optical fiber was 0.24 m, which was not very good. Industrial applicability
- an optical fiber and a preform having a good ECC can be obtained while minimizing cost increase by forming the lower end of the exit side of the quartz glass tube into a tapered shape.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/006063 WO2005105683A1 (ja) | 2004-04-27 | 2004-04-27 | 光ファイバおよびプリフォームの製造方法 |
JP2006512682A JP4568272B2 (ja) | 2004-04-27 | 2004-04-27 | 光ファイバおよびプリフォームの製造方法 |
KR1020067022567A KR101117778B1 (ko) | 2004-04-27 | 2004-04-27 | 광섬유 및 프리폼의 제조방법 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/006063 WO2005105683A1 (ja) | 2004-04-27 | 2004-04-27 | 光ファイバおよびプリフォームの製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005105683A1 true WO2005105683A1 (ja) | 2005-11-10 |
Family
ID=35241588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/006063 WO2005105683A1 (ja) | 2004-04-27 | 2004-04-27 | 光ファイバおよびプリフォームの製造方法 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP4568272B2 (ja) |
KR (1) | KR101117778B1 (ja) |
WO (1) | WO2005105683A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017154931A (ja) * | 2016-03-02 | 2017-09-07 | 住友電気工業株式会社 | 光ファイバ製造方法 |
KR20210005660A (ko) * | 2018-12-19 | 2021-01-14 | 넥서스 가부시키가이샤 | 석영 바이알병의 제조 방법 |
CN115286233A (zh) * | 2022-07-29 | 2022-11-04 | 富通集团有限公司 | 预制棒的加工方法及其加工设备 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003095685A (ja) * | 2001-09-17 | 2003-04-03 | Sumitomo Electric Ind Ltd | 光ファイバ母材及び製造方法 |
JP2004091304A (ja) * | 2002-07-08 | 2004-03-25 | Furukawa Electric Co Ltd:The | 光ファイバ母材の調芯方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6259546A (ja) * | 1985-09-11 | 1987-03-16 | Hitachi Cable Ltd | 光フアイバの同時線引用プリフオ−ム |
JP3800930B2 (ja) * | 2000-06-26 | 2006-07-26 | 住友金属工業株式会社 | 石英ガラスシリンダおよび石英ガラス管とその製造方法 |
-
2004
- 2004-04-27 JP JP2006512682A patent/JP4568272B2/ja not_active Expired - Lifetime
- 2004-04-27 KR KR1020067022567A patent/KR101117778B1/ko active IP Right Grant
- 2004-04-27 WO PCT/JP2004/006063 patent/WO2005105683A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003095685A (ja) * | 2001-09-17 | 2003-04-03 | Sumitomo Electric Ind Ltd | 光ファイバ母材及び製造方法 |
JP2004091304A (ja) * | 2002-07-08 | 2004-03-25 | Furukawa Electric Co Ltd:The | 光ファイバ母材の調芯方法 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017154931A (ja) * | 2016-03-02 | 2017-09-07 | 住友電気工業株式会社 | 光ファイバ製造方法 |
KR20210005660A (ko) * | 2018-12-19 | 2021-01-14 | 넥서스 가부시키가이샤 | 석영 바이알병의 제조 방법 |
EP3901107A4 (en) * | 2018-12-19 | 2022-02-16 | Nexus Company Inc. | PROCESS FOR MAKING A QUARTZ VESSEL |
KR102465679B1 (ko) | 2018-12-19 | 2022-11-11 | 넥서스 가부시키가이샤 | 석영 바이알병의 제조 방법 |
CN115286233A (zh) * | 2022-07-29 | 2022-11-04 | 富通集团有限公司 | 预制棒的加工方法及其加工设备 |
CN115286233B (zh) * | 2022-07-29 | 2023-11-21 | 富通集团有限公司 | 预制棒的加工方法及其加工设备 |
Also Published As
Publication number | Publication date |
---|---|
JP4568272B2 (ja) | 2010-10-27 |
KR101117778B1 (ko) | 2012-03-20 |
KR20070005708A (ko) | 2007-01-10 |
JPWO2005105683A1 (ja) | 2008-03-13 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6484540B1 (en) | Method for welding a quartz glass tube for use as an optical fiber preform | |
FI77217B (fi) | Foerfarande foer framstaellning av en polarisationsbevarande optisk fiber. | |
JP5038435B2 (ja) | 合成石英ガラス中空円筒の製造方法、および前記製造方法による厚肉中空円筒 | |
US8015846B2 (en) | Elongation method for producing an optical component of quartz glass and preliminary product suited for performing the method | |
JP5114409B2 (ja) | 高シリカ材料から成る構成材を接合する溶着方法とその方法を実施する装置 | |
US8661857B2 (en) | Method of manufacturing optical fiber preform | |
WO2005105683A1 (ja) | 光ファイバおよびプリフォームの製造方法 | |
JP5766157B2 (ja) | ガラス母材の延伸方法 | |
JP5728375B2 (ja) | ダミー棒が接続された光ファイバ母材の製造方法、および、ダミー棒の製造方法 | |
JP6059082B2 (ja) | 光ファイバの製造方法、及び、それに用いる光ファイバ用ワーク加工装置 | |
JP5518890B2 (ja) | 溶着方法、溶着装置、及び、光ファイバの製造方法 | |
US8484997B2 (en) | Method for producing a cylinder of quartz glass using a holding device and appropriate holding device for performing the method | |
JP4704760B2 (ja) | 光ファイバ母材の製造方法及び光ファイバ母材 | |
JP4712360B2 (ja) | 光ファイバ用プリフォームの製造方法及び光ファイバの製造方法 | |
JP2014221691A (ja) | ダミー棒一体型光ファイバ母材およびその製法 | |
US11384005B2 (en) | Method for elongating glass preform for optical fiber | |
JP2004091304A (ja) | 光ファイバ母材の調芯方法 | |
JP4496012B2 (ja) | 光ファイバ用ガラス母材の製造方法 | |
JP3836298B2 (ja) | 光ファイバ用プリフォームの製造方法 | |
JP2004143016A (ja) | 光ファイバ母材の製造方法 | |
JP2006027924A (ja) | 光ファイバ用母材、その製造方法及び装置 | |
JP2004277245A (ja) | 光ファイバ母材の製造方法 | |
JP2004168623A (ja) | 光ファイバ母材の製造方法 | |
JP2006104004A (ja) | 光ファイバ製造用石英ガラスチューブ、ならびに光ファイバ製造用石英ガラスチューブ、光ファイバ製造用プリフォームおよび光ファイバの製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2006512682 Country of ref document: JP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020067022567 Country of ref document: KR |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: DE |
|
122 | Ep: pct application non-entry in european phase |