WO2004113243A1 - 光ファイバ線引き装置およびガスシール機構 - Google Patents
光ファイバ線引き装置およびガスシール機構 Download PDFInfo
- Publication number
- WO2004113243A1 WO2004113243A1 PCT/JP2004/008234 JP2004008234W WO2004113243A1 WO 2004113243 A1 WO2004113243 A1 WO 2004113243A1 JP 2004008234 W JP2004008234 W JP 2004008234W WO 2004113243 A1 WO2004113243 A1 WO 2004113243A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- preform
- handle
- seal portion
- gas
- optical fiber
- 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
- C03B37/029—Furnaces therefor
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/60—Optical fibre draw furnaces
- C03B2205/80—Means for sealing the preform entry or upper end of the furnace
Definitions
- the present invention relates to an optical fiber drawing apparatus that heats and softens an optical fiber preform (hereinafter, simply referred to as a preform) in a heating furnace and draws out a reduced-diameter optical fiber from a lower part of the heating furnace.
- a gas sealing mechanism that prevents oxygen or moisture contained in the atmosphere from entering the heating furnace and the inert gas in the caro heating furnace being released into the atmosphere and oxidizing furnace materials.
- the present invention relates to an optical fiber drawing device having:
- a glass base material is manufactured by depositing glass fine particles by a shafting method (VAD method), an external method (OVD method), or the like, and this is dehydrated and sintered to form a transparent vitrified mother material. Wood ingot is obtained. This is further roughly stretched in an electric furnace and reduced to a diameter used for drawing to obtain a preform.
- the preform is fed into the furnace from the upper part of the heating furnace, which is installed at the uppermost part of the drawing apparatus, and is softened by heating, and the reduced optical fiber is taken out from the lower part of the furnace.
- the optical fiber is provided with a protective coat on the surface, and is wound on a bobbin by a winding device.
- a high-density carbon graphite is used as a heater in a heating furnace, and a low-density carbon material is used as a heat insulating material.
- the furnace temperature is maintained at 2,000 ° C or higher.However, in such a high temperature state, the carbon material used in the furnace is oxidized even by a small amount of oxygen or moisture mixed in, and oxidized from the surface. Debris or carbon particles peel off.
- the inert gas introduced into the heating furnace is It also forms a stable gas flow on the surface of the part that is softened and reduced in diameter to the optical fiber (neck-down part), and also has the function of suppressing diameter fluctuation of the optical fiber.
- the cross-sectional area of the upper and lower openings of the heating furnace changes, the gas pressure in the furnace fluctuates, causing a disturbance of the stable gas flow. For this reason, it is always desirable to keep the opening small.
- the preform is gripped by a chuck provided at the upper part of the drawing apparatus, and is fed into the heating furnace at a slow speed of 115 mm / min by a vertical moving mechanism.
- the temperature inside the furnace reaches a maximum of several tens of centimeters from the upper entrance, and the preform is melted.
- a quartz glass rod called a handle is welded to the upper part of the preform in order to enter the heating part of the furnace up to the upper end of the preform.
- the lower end of the preform is first melted, and first, a rod-shaped glass having a diameter of 520 mm is drawn out from the lower side of the heating furnace. Then, it is adjusted to an optical fiber having a predetermined diameter.
- the gas seal at the opening on the lower side of the heating furnace from which the optical fiber is drawn is performed as follows.
- a mechanism such as an iris diaphragm, which can continuously change the opening diameter, and a shutter mechanism that can be opened and closed with a 3-7 mm opening in the center are mounted in the opening below the heating furnace.
- Optical fibers have very small diameter fluctuations and positional deviations except immediately after the start of drawing, so a minimum clearance is secured. These gas seal mechanisms effectively prevent gas leakage and entry of large air. Can be prevented.
- FIG. 7 Conventionally, an apparatus as shown in FIG. 7 has been used for drawing a preform.
- a handle 2 having the same outer diameter as the preform 1 is used.
- the welded portion 3 was flattened so that there was no step.
- Patent Document 1 discloses an example in which an upper chamber integrated with a furnace body is provided above a heating furnace.
- Patent Documents 2 and 3 disclose a mechanism that constantly monitors the position of a drawing rod and automatically opens and closes an upper shutter so that the clearance is constant even when the diameter of a preform or a handle changes. Te, ru.
- Patent Document 4 discloses a method in which a cylindrical cap having the same outer diameter as the preform is put around the handle, and the wire is drawn with the same diameter as the preform. This method is relatively easy to carry out, but when the outer diameter force of the preform changes by 0.5 mm or more, it was necessary to replace the entire cap accordingly.
- Patent Document 1 Japanese Patent Application Laid-Open No. 9-2832
- Patent Document 2 JP-A-8-253337
- Patent Document 3 JP-A-10-8633
- Patent Document 4 JP-A-2002-356344
- the present invention provides a large-diameter preform having a diameter of 80 mm or more with different diameters. Even if the drawn rod is formed by welding a handle that is welded, or if the welded portion has a convex part, it is possible to prevent air from entering the heating furnace, and furthermore, the outer diameter of the preform or the handle is reduced by the draw rod. It is an object of the present invention to provide an optical fiber drawing apparatus having a gas seal mechanism configured to easily cope with the case where the optical fiber is different from the above.
- an optical fiber for drawing an optical fiber by melting and reducing the diameter of a drawing rod formed by welding a handle to an end of a preform In a fiber drawing apparatus, a heating furnace that receives the preform of the drawing rod from an opening and heats it to melt it, and is disposed in the opening of the heating furnace and restricts movement of gas around the handle. And a preform seal portion disposed between the heating furnace and the handle seal portion in the longitudinal direction of the preform and restricting the movement of gas around the preform.
- the handle seal portion has a gas seal member surrounding the periphery of the handle
- the preform seal portion has a gas seal member surrounding the periphery of the preform.
- the gas seal member of the handle seal portion and the gas seal member of the preform seal portion are made of a heat-resistant material having a small hardness without causing damage to the glass surface by contact and sliding. Is also good.
- the gas seal member of the handle seal portion and the gas seal member of the preform seal portion may be a sheet-shaped carbon finolem.
- a plurality of the gas seal members of the handle seal portion and a plurality of the gas seal member caps of the preform seal portion are arranged in a longitudinal direction of the preform.
- the gas seal member of the handle seal portion and the gas seal member of the preform seal portion can be detached from the main body of the handle seal portion and the main body of the preform seal portion, respectively. It may be.
- the size of the opening of the handle seal portion in the gas seal member may be smaller than the size of the opening of the preform seal portion in the gas seal member.
- the handle seal portion may include an opaque heat-resistant member that blocks radiant heat radiated from the handle and the welded portion of the preform.
- the heat-resistant member may be a ceramic material made of any one of BN, SiN, and SiC, or a metal material made of any of W, Ta, and stainless steel. .
- the handle seal portion includes a gas seal member surrounding the handle, and in the handle seal member, the heat-resistant member is closer to the heating furnace than the gas seal member. May be arranged.
- the heat-resistant member may be disposed between the gas seal member of the handle seal portion and the preform seal portion.
- an optical fiber drawing apparatus for drawing an optical fiber by melting and reducing the diameter of a drawing rod formed by welding a handle to an end of a preform in a heating furnace.
- a gas seal mechanism for restricting the movement of gas in the opening of the heating furnace in the above, wherein the handle sealing part is arranged in the opening of the heating furnace and restricts the movement of gas around the handle;
- a preform seal portion disposed between the heating furnace and the handle seal portion in the longitudinal direction of the reform to limit movement of gas around the preform.
- the movement of gas between the periphery of the preform and the periphery of the handle is restricted, so that the air is prevented from entering the heating furnace, and the inside of the heating furnace is prevented. It is possible to prevent the inert gas from diffusing into the atmosphere.
- FIG. 1 is a schematic sectional view showing a drawing rod formed by welding handles having different diameters to a preform.
- FIG. 2 is a schematic sectional view showing a state where a preform is inserted into a furnace in the drawing apparatus of the present invention.
- FIG. 3 is a schematic sectional view showing a handle seal portion 10 set on a drawing rod.
- FIG. 4 is a schematic perspective view showing a member used for the handle seal portion 10 where a disk and a cylinder are welded.
- FIG. 5 is a schematic cross-sectional view showing a preform seal portion 16 installed at an upper part of a heating furnace.
- FIG. 6 is a schematic cross-sectional view showing a state in which a handle portion is pressed against the upper part of the heating furnace in the drawing apparatus of the present invention.
- FIG. 7 is a schematic cross-sectional view showing a drawing device used in Comparative Example 1 and provided with a conventional gas seal mechanism.
- FIG. 8 is a schematic cross-sectional view showing a drawing apparatus used in Comparative Example 2 and provided with a conventional gas sealing mechanism.
- the drawing rod 30 used in the present embodiment has an upper end of the preform 1 in order to insert the entire preform 1 into the heating furnace 15 to form an optical fiber.
- Hand hole 2 is welded to weld 3.
- the handle 2 is made of a solid rod of synthetic quartz or natural quartz or a tube with a wall thickness of 5 mm or more. Its outer diameter is smaller than that of the preform 1 and its length depends on the size of the heating furnace. mm is used.
- a handle that is welded to a preform with a diameter of ⁇ 80 mm and a length of 1,000 mm (hereinafter simply referred to as ⁇ 80 x 1,000 mm) is about ⁇ 50 x 700 mm, and is used as a handle for a wire drawing door.
- the total length is 1,700 mm, and it is gripped by the chuck of the preform supply part of the wire drawing device and dropped into the furnace.
- FIG. 2 is a sectional view of an optical fiber drawing apparatus 20 according to an embodiment of the present invention.
- the optical fiber drawing apparatus 20 shown in FIG. 2 includes a heating furnace 15 for heating the drawing rod 30 to melt it, and a gas seal mechanism 22 disposed at an opening on the upper surface of the heating furnace 15.
- the heating furnace 15 has a substantially cylindrical shape with an open upper surface, and has a heating heater 17 inside.
- the heating furnace 15 receives the preform 1 of the drawing rod 30 from the opening on the upper surface, and the heating heater 17 heats the preform 1 stored in the heating furnace 15.
- Optical fiber drawing The device 20 moves the drawing rod 30 in the longitudinal direction (upward and downward in the figure) by a lifting mechanism (not shown).
- the leading end drawn in the preform 1 can be positioned near the heater 117 to heat the leading end.
- the gas seal mechanism 22 restricts the movement of gas in the opening on the upper surface of the heating furnace 15.
- the gas seal mechanism 22 of the present embodiment includes a preform seal portion 16 disposed at an opening on the upper surface of the heating furnace 15 and a gas seal mechanism 22 disposed above the preform seal portion 16. That is, the preform seal portion 16 is disposed between the heating furnace 15 and the handle seal portion 10 in the longitudinal direction of the preform 1.
- FIG. 3 is a cross-sectional view showing the periphery of the handle seal portion 10.
- the handle seal portion 10 has a gas seal member 8 surrounding the handle 2.
- a flat disk 4 having a hole with a diameter larger than the diameter of the handle by 5 to 10 mm is fixed to the welded portion 3 of the drawing rod or the shoulder of the preform 1 in the immediate vicinity thereof.
- a disk 5 having a similar inner diameter and a flat upper surface, as shown in FIG. 4, and a cylinder 6 having an inner diameter force of about 10 mm larger than the preform diameter can be used. .
- a heat insulating ring 7 made of an opaque heat-resistant material with a hole having an inner diameter 3 to 8mm larger than the handle is placed.
- the heat shield ring 7 is for blocking radiant heat emitted from the welded portion between the preform and the handle during heating, and may be made of a ceramic material such as BN, SiN, SiC, or 800 ° C. Metal materials such as W, Ta, and other heat-resistant stainless materials that can withstand the above temperatures are used.
- a gas seal member 8 having a hole 0.5 to 1.5 mm larger than the outer diameter of the handle 2 is placed on the heat shield ring 7.
- the heat shield ring 7 is disposed in the heating furnace 15 more than the gas seal member 8. Therefore, it is possible to prevent the radiant heat radiated from the welding portion 3 of the drawing rod 30 from directly heating and melting the gas seal member 8.
- the gas seal member 8 is made of a carbon material having a thickness of 0.5 to 2 mm as a material capable of withstanding high temperatures due to contact with the preform 1 and the handle 2 without damaging the glass due to sliding. It is used by stacking two or three pieces in the longitudinal direction of the handle 2 which is preferred by the system. Since a plurality of gas seal members 8 are arranged in the longitudinal direction of the handle 2, when the handle 2 moves in the longitudinal direction, In addition, it is possible to more reliably restrict the movement of gas between the halves 2 and the gas seal member 8 while suppressing an increase in the resistance of the gas seal member 8 to contact with the handlebar 2. Further, a weight ring 9 is mounted on the gas seal member 8 to prevent the gas seal member 8 from floating.
- the weight a material that can withstand a high temperature of 800 ° C. or more is used, and in particular, quartz glass, the above-described ceramic materials, and metal materials are preferable.
- the inner diameter of the weight ring 9 should be about 10 mm larger than the handle so as not to touch the handle.
- FIG. 5 is a cross-sectional view of the preform seal portion 16.
- the cylindrical member 11 is a support for supporting the gas seal member 12, and is made of a heat-resistant material such as stainless steel.
- the inner diameter of the cylindrical member 11 is set to be about 5 10 mm larger than the outer diameter of the preform 1 so that the preform 1 does not come into contact.
- a ring-shaped gas seal member made of carbon film or the like is formed on the cylindrical member 11 so that the surface of the preform 1 is not damaged by contact with the preform 1 as in the gas seal mechanism of the handle portion. 12 are arranged.
- As the gas seal member 12 two to three sheets having an inner diameter of 0.5 to 2 mm larger than the preform diameter and a thickness of about 0.5 to 2 mm are used.
- the gas seal member 12 Since a plurality of the gas seal members 12 are arranged in the longitudinal direction of the preform 1, the gas seal member 12 suppresses an increase in the resistance of the gas seal member 12 to contact the preform 1 when the preform 1 moves in the longitudinal direction. The movement of gas between the reform 1 and the gas seal member 12 can be more reliably restricted.
- the inside of the heating furnace 15 is kept in an inert gas atmosphere, even if a carbon film is used for the gas seal member 12, it is not oxidized by radiant heat. It is not necessary to provide materials.
- a weight ring 13 is placed on the gas seal member 12 so that the gas seal member 12 does not shift due to the vertical movement of the preform.
- a heat-resistant material such as quartz glass, a ceramic material, or a metal material is used.
- a transparent cylindrical member 14 made of quartz glass or the like is further placed on the weight ring 13. That is, The cylindrical member 14 is disposed between the gas seal member 8 of the handle seal 10 and the preform seal 16.
- the cylindrical member 14 is not required. Since radiant heat is radiated from the welded portion 3 of the preform 1 and the handle 2 and the temperature of the portion becomes high, it is preferable to use quartz glass which transmits light.
- a preform seal portion 16 having the above-described configuration is installed on a heating furnace 15, and a welding portion between the preform 1 and the handle 2 is provided with a handle seal portion.
- the drawing rod 30 is gripped by the chuck of the drawing device 20 and is gradually fed into the heating furnace 15 as the drawing progresses.
- the preform seal portion 16 allows the air to enter the heating furnace 15 and conversely releases a large amount of gas in the heating furnace 15 to the outside. Is prevented.
- gas seal members 8 and 12 having different inner diameters are prepared, and by using them according to the diameter of the preform 1 and the handle 2, the diameters thereof are different by 15 mm.
- the members other than the gas seal members 8 and 12 are not changed, and a good gas scenery effect can be obtained.
- the gas seal member can be easily cut, so that a plurality of gas seal members 8 and 12 having different diameters can be formed from a material having a large area.
- the gas seal member 8 of the handle seal portion 10 and the gas seal member 12 of the preform seal portion 16 may be removable from the main body of the handle seal portion 10 and the main body of the preform seal portion 16, respectively. Les ,.
- the gas seal member 8 and the gas seal member 12 can be easily replaced according to the outer diameters of the handle 2 and the preform 1, respectively. Further, when the gas seal member 8 or the gas seal member 12 is deteriorated due to abrasion or the like, it is possible to reduce the cost of replacement by replacing only the gas seal member 8 or the gas seal member 12.
- a ⁇ 50 mm handle was welded to one end of a ⁇ 80 mm preform using a glass lathe with an oxyhydrogen burner to form a drawing rod.
- the handle portion was gripped by the chuck of the drawing device, the chuck was lowered, and the preform 1 was suspended in the heating furnace.
- a preform seal part 16 as shown in FIG. 4 was previously attached to the upper part of the heating furnace 15. In this state, the inside of the furnace was heated to 2,080 ° C to form a neck-down portion at the lower part of the preform 1, and the optical fiber was drawn out from the opening provided on the lower surface of the heating furnace 15 (see Fig. 5). .
- the preform 1 moves downward, and the fiber is drawn out from below the heating furnace 15.
- the preform 1 is shown in FIG.
- the cylindrical member 14 forming the preform seal portion 16 and the disk 4 forming the handle seal portion 10 are in contact with each other.
- the handle portion of the drawing rod reaches the preform seal portion 16, and the gas seal member 12 completely separates from the surface of the handle 2, thus completely serving as a gas seal. Instead, the force was sealed by the handle seal part 10, and no air was mixed into the furnace or the inert gas in the furnace was released.
- the preform part was used for drawing over the entire length, and could be converted into an optical fiber up to the welded part with the handle.
- the obtained optical funiver had an outer diameter variation of ⁇ 0.3 ⁇ or less, and the result of the proof test also confirmed that it had good strength characteristics.
- Example 2 a ⁇ 55 mm handle was welded to one end of a ⁇ 83 mm preform, and a handle seal portion 10 was attached thereto.
- the preform was introduced into the furnace through the preform seal part 16.
- the members used in Example 1 were used as they were, except that a ring-shaped carbon film having a hole diameter of ⁇ 56 mm was used for the gas seal member.
- the members used in Example 1 were used as they were, except that a carbon film having a hole diameter of 84 mm was used.
- Example 1 As in Example 1, a ⁇ 50 mm handle was welded to a ⁇ 80 mm preform, and a conventionally used stainless steel metal ring shown in FIG. , And the wire was drawn. In this case, when the welding portion 3 of the drawing rod was pressed against the metal ring 18, the gas could not be sealed, so that the drawing could not be continued any more.
- the heating furnace 15 used had the highest temperature at a point 350 mm from the upper opening, forming a neck-down portion. For this reason, drawing had to be stopped up to 350 mm from the welded portion 3 of the preform 1, and the yield of the optical fiber was reduced accordingly.
- Example 1 As in Example 1, a ⁇ 50 mm handle was welded to one end of a ⁇ 80 mm preform, and the heat shield ring 7 shown in FIG. 2 was drawn using quartz glass. At the same time as the preform 1 enters the heating furnace 15 and becomes high temperature, the radiant light generated in the furnace from the welding part 3 of the drawing rod is radiated to the gas seal member 8 made of carbon film, and the gas seal member is made in the atmosphere. 8 was oxidized and ragged, and could no longer function as a gas seal.
- the heating furnace It is possible to prevent the air from entering the inside of the heating furnace 15 and, conversely, release a large amount of gas power inside the heating furnace 15 to the outside.
- the diameter of the opening of the gas seal member 8 of the handle seal portion 10 is made smaller than the diameter of the opening of the gas seal member 12 of the preform seal portion 16 accordingly.
- the gas seal member 12 and the gas seal member 8 function as a gas seal, and the drawing rod 30 moves to bring the handle 2 near the gas seal member 12.
- the gas seal member 8 can still perform the function of the gas seal even when the gas seal member is closed.
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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 |
---|---|---|---|
JP2003173722A JP2005008475A (ja) | 2003-06-18 | 2003-06-18 | 光ファイバ線引き装置 |
JP2003-173722 | 2003-06-18 |
Publications (1)
Publication Number | Publication Date |
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WO2004113243A1 true WO2004113243A1 (ja) | 2004-12-29 |
Family
ID=33534729
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/008234 WO2004113243A1 (ja) | 2003-06-18 | 2004-06-11 | 光ファイバ線引き装置およびガスシール機構 |
Country Status (3)
Country | Link |
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JP (1) | JP2005008475A (ja) |
TW (1) | TW200508164A (ja) |
WO (1) | WO2004113243A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2022766A2 (en) | 2007-08-10 | 2009-02-11 | Shin-Etsu Chemical Company, Ltd. | An apparatus for fabricating an optical fiber and a method for sealing a drawing furnace |
CN105073664A (zh) * | 2013-02-25 | 2015-11-18 | 住友电气工业株式会社 | 光纤拉丝方法及光纤拉丝装置 |
JP2019026524A (ja) * | 2017-08-01 | 2019-02-21 | 株式会社フジクラ | 製造方法及びキャップ |
Families Citing this family (10)
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JP5346567B2 (ja) | 2008-12-05 | 2013-11-20 | 株式会社フジクラ | 光ファイバ製造装置、光ファイバの製造方法 |
JP5541775B2 (ja) * | 2009-12-03 | 2014-07-09 | 信越化学工業株式会社 | ガラス母材延伸装置 |
JP5701228B2 (ja) * | 2012-01-19 | 2015-04-15 | 信越化学工業株式会社 | 多孔質ガラス母材の遮熱部材および焼結方法 |
JP5923996B2 (ja) * | 2012-01-26 | 2016-05-25 | 住友電気工業株式会社 | 光ファイバの線引き炉ならびに光ファイバの線引方法 |
JP5923997B2 (ja) * | 2012-01-26 | 2016-05-25 | 住友電気工業株式会社 | 光ファイバ用線引炉および光ファイバ線引方法 |
CN102838275B (zh) * | 2012-08-28 | 2015-02-04 | 长飞光纤光缆股份有限公司 | 外径波动光纤预制棒的拉丝方法及装置 |
WO2015050103A1 (ja) * | 2013-10-01 | 2015-04-09 | 住友電気工業株式会社 | 光ファイバの製造方法 |
KR200480330Y1 (ko) * | 2016-04-15 | 2016-05-11 | 김명종 | 어두운 곳에서 빛에 의해 특정 표시가 나타나는 티켓 |
JP7155631B2 (ja) * | 2018-06-11 | 2022-10-19 | 住友電気工業株式会社 | 光ファイバの線引き方法 |
CN112374745A (zh) * | 2020-11-26 | 2021-02-19 | 通鼎互联信息股份有限公司 | 一种原始尾柄预制棒的拉丝装置及其拉丝方法 |
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JPS62202836A (ja) * | 1986-03-03 | 1987-09-07 | Sumitomo Electric Ind Ltd | 光フアイバ線引用加熱炉 |
JPS6327445U (ja) * | 1986-08-08 | 1988-02-23 | ||
JP2002356344A (ja) * | 2001-05-31 | 2002-12-13 | Hitachi Cable Ltd | 光ファイバ線引方法及び光ファイバ線引炉 |
JP2003212582A (ja) * | 2002-01-16 | 2003-07-30 | Fujikura Ltd | 光ファイバ母材の加熱方法及びこれに用いられる加熱炉 |
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- 2003-06-18 JP JP2003173722A patent/JP2005008475A/ja not_active Withdrawn
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- 2004-06-16 TW TW093117277A patent/TW200508164A/zh unknown
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JPS6251147U (ja) * | 1985-09-12 | 1987-03-30 | ||
JPS6251148U (ja) * | 1985-09-12 | 1987-03-30 | ||
JPS62202836A (ja) * | 1986-03-03 | 1987-09-07 | Sumitomo Electric Ind Ltd | 光フアイバ線引用加熱炉 |
JPS6327445U (ja) * | 1986-08-08 | 1988-02-23 | ||
JP2002356344A (ja) * | 2001-05-31 | 2002-12-13 | Hitachi Cable Ltd | 光ファイバ線引方法及び光ファイバ線引炉 |
JP2003212582A (ja) * | 2002-01-16 | 2003-07-30 | Fujikura Ltd | 光ファイバ母材の加熱方法及びこれに用いられる加熱炉 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2022766A2 (en) | 2007-08-10 | 2009-02-11 | Shin-Etsu Chemical Company, Ltd. | An apparatus for fabricating an optical fiber and a method for sealing a drawing furnace |
EP2022766A3 (en) * | 2007-08-10 | 2011-03-23 | Shin-Etsu Chemical Company, Ltd. | An apparatus for fabricating an optical fiber and a method for sealing a drawing furnace |
US8322165B2 (en) | 2007-08-10 | 2012-12-04 | Shin-Etsu Chemical Co., Ltd. | Apparatus for fabricating an optical fiber |
CN105073664A (zh) * | 2013-02-25 | 2015-11-18 | 住友电气工业株式会社 | 光纤拉丝方法及光纤拉丝装置 |
JP2019026524A (ja) * | 2017-08-01 | 2019-02-21 | 株式会社フジクラ | 製造方法及びキャップ |
Also Published As
Publication number | Publication date |
---|---|
TW200508164A (en) | 2005-03-01 |
JP2005008475A (ja) | 2005-01-13 |
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