JPH08325028A - Production of glass preform for optical fiber - Google Patents
Production of glass preform for optical fiberInfo
- Publication number
- JPH08325028A JPH08325028A JP7128122A JP12812295A JPH08325028A JP H08325028 A JPH08325028 A JP H08325028A JP 7128122 A JP7128122 A JP 7128122A JP 12812295 A JP12812295 A JP 12812295A JP H08325028 A JPH08325028 A JP H08325028A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- glass preform
- porous glass
- preform
- base material
- 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.)
- Granted
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
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ガラス微粒子を堆積さ
せた光ファイバ用多孔質ガラス母材を透明化して光ファ
イバ用ガラス母材を製造する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a glass preform for optical fiber by making a porous glass preform for optical fiber having glass particles deposited thereon transparent.
【０００２】[0002]
【従来の技術】光ファイバ用ガラス母材の製造方法の一
つとして以下の方法が知られている。即ち、ガラス原料
と燃焼用ガスをバーナーから噴出させて、火炎中でガラ
ス原料を火炎加水分解させ、ガラス微粒子を生成する。
このガラス微粒子を回転するターゲットの外周に堆積さ
せて、円柱状の多孔質ガラス母材を作製する。この多孔
質ガラス母材を炉心管を有する電気炉に入れ、加熱によ
り透明ガラス化して、線引き用の光ファイバ用ガラス母
材を得る。従来の多孔質ガラス母材１は、例えば図２に
示すような形状をしている。この多孔質ガラス母材１
は、円柱状部２の両端にテーパ状部３、４を有し、一方
のテーパ状部３に吊り下げて支持する支持部５を設けた
形状をしている。2. Description of the Related Art The following method is known as one of methods for manufacturing a glass preform for optical fibers. That is, the glass raw material and the combustion gas are ejected from the burner, and the glass raw material is flame-hydrolyzed in the flame to generate fine glass particles.
The glass fine particles are deposited on the outer circumference of the rotating target to produce a cylindrical porous glass preform. This porous glass preform is placed in an electric furnace having a furnace core tube and heated to be transparent vitrified to obtain an optical fiber glass preform for drawing. The conventional porous glass base material 1 has, for example, a shape as shown in FIG. This porous glass base material 1
Has a shape in which the cylindrical portion 2 has tapered portions 3 and 4 at both ends thereof, and the supporting portion 5 that suspends and supports the tapered portion 3 is provided.
【０００３】[0003]
【発明が解決しようとする課題】光ファイバの生産性を
向上させるためには、できるだけ大きな多孔質ガラス母
材を作製し、大きな光ファイバ用ガラス母材を得る必要
がある。そのためには、多孔質ガラス母材を加熱する炉
心管の内径を大きくする必要が生ずる。しかしながら、
炉心管の内径を大きくし、加熱炉のサイズを大きくする
と、設備費が増加する。また、炉心管と多孔質ガラス母
材間の空隙面積が大きくなると、ガラス化雰囲気ガスの
消費量が増加するという不利な点がある。そこで、多孔
質ガラス母材と炉心管とのクリアランスを小さくし、加
熱炉のサイズを小さくするとともに、ガラス化雰囲気ガ
スの消費量を節減することが望ましい。しかしながら、
炉心管と多孔質ガラス母材のクリアランスを小さくする
と、多孔質ガラス母材を炉心管に挿入する際に、わずか
な振動で多孔質ガラス母材が炉心管内壁に接触して割れ
たり、割れなくとも、多孔質ガラス母材の表面に擦り傷
が付き、光ファイバ用ガラス母材の製造歩留りが低下す
るという問題があった。In order to improve the productivity of optical fibers, it is necessary to manufacture a porous glass preform as large as possible and obtain a large glass preform for optical fibers. For that purpose, it becomes necessary to increase the inner diameter of the furnace tube for heating the porous glass preform. However,
Increasing the inner diameter of the core tube and increasing the size of the heating furnace increases the equipment cost. Further, when the void area between the core tube and the porous glass preform becomes large, there is a disadvantage that the consumption amount of the vitrifying atmosphere gas increases. Therefore, it is desirable to reduce the clearance between the porous glass preform and the furnace core tube, reduce the size of the heating furnace, and reduce the consumption amount of the vitrifying atmosphere gas. However,
If the clearance between the furnace core tube and the porous glass base material is made small, when the porous glass base material is inserted into the furnace core tube, the porous glass base material will not come into contact with the inner wall of the furnace core tube with cracks or cracks due to slight vibration. In both cases, there is a problem that the surface of the porous glass preform is scratched and the production yield of the glass preform for optical fiber is reduced.
【０００４】[0004]
【課題を解決するための手段】本発明は上記問題点を解
決した光ファイバ用ガラス母材の製造方法を提供するも
ので、円柱状部の一端にテーパ状部を有する光ファイバ
用多孔質ガラス母材を、該テーパ状部から加熱炉に挿入
して、加熱し透明化する光ファイバ用ガラス母材の製造
方法において、前記光ファイバ用多孔質ガラス母材は、
円柱状部とテーパ状部との境界部分に円柱状部よりも拡
径した部分を有し、且つ、該拡径した部分の表面は円柱
状部の表面よりも密度が高いことを特徴とするものであ
る。SUMMARY OF THE INVENTION The present invention provides a method for producing a glass base material for an optical fiber, which solves the above-mentioned problems, and is a porous glass for an optical fiber having a tapered portion at one end of a cylindrical portion. In the method for producing a glass preform for an optical fiber, in which the preform is inserted into the heating furnace from the tapered portion and heated to be transparent, the porous glass preform for the optical fiber is
A boundary portion between the columnar portion and the tapered portion has a portion having a diameter larger than that of the columnar portion, and the surface of the portion having a larger diameter has a higher density than the surface of the columnar portion. It is a thing.
【０００５】[0005]
【作用】上述のような構造の光ファイバ用多孔質ガラス
母材を加熱炉に挿入して、加熱し透明化すると、この光
ファイバ用多孔質ガラス母材が加熱炉に挿入する際に、
加熱炉の炉心管の内壁に接触したとしても、拡径した部
分で接触するので、この部分においてのみ擦り傷が生ず
る。また、この拡径した部分は他の部分よりも密度が高
くなっているので、擦り傷はこの部分のみでおさまり、
他の部分に波及することはない。When the porous glass preform for optical fibers having the above structure is inserted into the heating furnace and heated to be transparent, when the porous glass preform for optical fibers is inserted into the heating furnace,
Even if it comes into contact with the inner wall of the furnace core tube of the heating furnace, it comes into contact with the enlarged diameter portion, so that scratches occur only in this portion. Also, since this expanded diameter part has a higher density than other parts, the scratches can be stopped only in this part,
It does not affect other parts.
【０００６】[0006]
【実施例】以下、図面に示した実施例に基づいて本発明
を詳細に説明する。図１は本発明にかかる光ファイバ用
ガラス母材の製造方法の一実施例に用いた光ファイバ用
多孔質ガラス母材の側面図である。この光ファイバ用多
孔質ガラス母材１１は、以下のようにして製作した。即
ち、 １）先ず、外径４０ｍｍ、長さ１ｍの円柱状のコアを含
む光ファイバ用石英ガラス母材の一端に、３００ｍｍ長
の石英ガラス製支持部１５を溶着し、他端は切り離した
ままにして、光ファイバ用多孔質ガラス母材の出発母材
とした。 ２）この出発母材を縦型マルチパス合成装置にかけ、２
００ｍｍφまで多孔質ガラスを成長させた。この縦型マ
ルチパス合成装置は、光ファイバ用多孔質ガラス母材の
出発母材を上下方向に設置し、自身の軸を回転中心とし
て自転するこの母材に沿って、バーナーを上下方向に複
数回、トラバースさせて、所定量の多孔質ガラスを付着
させる装置である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a side view of a porous glass preform for an optical fiber used in an example of a method for producing a glass preform for an optical fiber according to the present invention. The porous glass base material 11 for optical fiber was manufactured as follows. That is, 1) First, a 300 mm long silica glass support portion 15 is welded to one end of a silica glass base material for an optical fiber including a cylindrical core having an outer diameter of 40 mm and a length of 1 m, and the other end is kept separated. Then, it was used as a starting base material of the porous glass base material for an optical fiber. 2) Apply this starting base material to a vertical multi-pass synthesizer, and
Porous glass was grown to 00 mmφ. This vertical multi-pass synthesizer installs the starting preform of the porous glass preform for optical fibers in the vertical direction, and multiple burners in the vertical direction along this preform that rotates about its own axis as the center of rotation. This is an apparatus for traversing once and adhering a predetermined amount of porous glass.
【０００７】成長条件は以下の通りである。即ち、バー
ナーへのガスの投入量は、水素２００ｌ／ｍｉｎ、酸素
５０ｌ／ｍｉｎ、アルゴン２ｌ／ｍｉｎ、四塩化珪素１
２ｌ／ｍｉｎ、トラバース速度は２０００ｍｍ／ｍｉｎ
である。この成長の際、支持部１５と反対側（下端）の
トラバースの下反転位置で、反転ごとに１秒間のバーナ
ーのトラバース停止時間を設けた。このようにして製作
した光ファイバ用多孔質ガラス母材１１は、円柱状部１
２の両端にテーパ状部１３、１４が形成された形状をし
ており、円柱状部１２の外径は２００ｍｍφ、円柱状部
１２と下端のテーパ状部１４との境界部分１６の外径は
拡径して２０５ｍｍφであった。また、境界部分１６は
加熱時間が相対的に長くなっているので、境界部分１６
の表面の密度は円柱状部１２の密度よりも１０〜２０％
高くなっていた。このようにして製作した光ファイバ用
多孔質ガラス母材１１を、内径２２０ｍｍの炉心管に挿
入して、加熱、透明化して光ファイバ用ガラス母材を製
作した。その結果、光ファイバ用多孔質ガラス母材１１
の円柱部１２に傷がつくことがなく、光ファイバ用ガラ
ス母材の製造歩留りが向上した。The growth conditions are as follows. That is, the amount of gas introduced into the burner was 200 l / min of hydrogen, 50 l / min of oxygen, 2 l / min of argon and 1 part of silicon tetrachloride.
2 l / min, traverse speed 2000 mm / min
Is. During this growth, the traverse stop time of the burner for 1 second was provided at the lower reversal position of the traverse on the opposite side (lower end) to the support portion 15 for each reversal. The porous glass preform 11 for an optical fiber manufactured in this way has a cylindrical portion 1
The outer diameter of the cylindrical portion 12 is 200 mmφ, and the outer diameter of the boundary portion 16 between the cylindrical portion 12 and the tapered portion 14 at the lower end is 2 mm. The diameter was expanded to 205 mmφ. Further, since the heating time of the boundary portion 16 is relatively long, the boundary portion 16
Surface density is 10 to 20% higher than that of the cylindrical portion 12.
It was getting higher. The porous glass base material 11 for optical fiber thus manufactured was inserted into a furnace core tube having an inner diameter of 220 mm, heated and made transparent to manufacture a glass base material for optical fiber. As a result, the porous glass base material for optical fiber 11
The cylindrical portion 12 was not scratched, and the production yield of the glass preform for optical fiber was improved.
【０００８】なお、本発明にかかる光ファイバ用ガラス
母材の製造方法に用いる光ファイバ用多孔質ガラス母材
は、上記実施例に限らず、トラバースの反転位置で原料
ガスと酸水素ガスを一瞬増加させることにより製作する
こともできる。The porous glass base material for an optical fiber used in the method for producing a glass base material for an optical fiber according to the present invention is not limited to the above-mentioned embodiment, but the raw material gas and the oxyhydrogen gas are momentarily supplied at the reverse position of the traverse. It can also be manufactured by increasing the number.
【０００９】[0009]
【発明の効果】以上説明したように本発明によれば、円
柱状部の一端にテーパ状部を有する光ファイバ用多孔質
ガラス母材を、該テーパ状部から加熱炉に挿入して、加
熱し透明化する光ファイバ用ガラス母材の製造方法にお
いて、前記光ファイバ用多孔質ガラス母材は、円柱状部
とテーパ状部との境界部分に円柱状部よりも拡径した部
分を有し、且つ、該拡径した部分の表面は円柱状部の表
面よりも密度が高いため、平行部の傷により光ファイバ
用ガラス母材の製造歩留りを低下させることなく、光フ
ァイバ用多孔質ガラス母材と加熱炉の炉心管とのクリア
ランスを小さし、加熱炉の設備費および原料ガスの消費
量を節減することができるという優れた効果がある。As described above, according to the present invention, a porous glass preform for optical fibers having a tapered portion at one end of a cylindrical portion is inserted into the heating furnace from the tapered portion and heated. In the method for manufacturing an optical fiber glass preform to be transparent, the optical fiber porous glass preform has a portion having a diameter larger than that of the cylindrical portion at the boundary between the cylindrical portion and the tapered portion. Further, since the surface of the expanded diameter portion has a higher density than the surface of the cylindrical portion, it does not reduce the manufacturing yield of the glass preform for optical fiber due to scratches in the parallel portion, and the porous glass preform for optical fiber is used. There is an excellent effect that the clearance between the material and the core tube of the heating furnace can be reduced, and the equipment cost of the heating furnace and the consumption of the raw material gas can be reduced.
【図１】本発明に係る光ファイバ用ガラス母材の製造方
法の一実施例に用いた光ファイバ用多孔質ガラス母材の
側面図である。FIG. 1 is a side view of a porous glass preform for an optical fiber used in an example of a method for producing a glass preform for an optical fiber according to the present invention.
【図２】従来の光ファイバ用ガラス母材の製造方法に用
いている光ファイバ用多孔質ガラス母材の側面図であ
る。FIG. 2 is a side view of a porous glass preform for an optical fiber used in a conventional method for producing a glass preform for an optical fiber.
１１ 光ファイバ用多孔質ガラス母材 １２ 円柱状部 １３、１４ テーパ状部 １５ 支持部 １６ 境界部分 11 Porous Glass Preform for Optical Fiber 12 Cylindrical Part 13, 14 Tapered Part 15 Supporting Part 16 Boundary Part
Claims (1)
ファイバ用多孔質ガラス母材を、該テーパ状部から加熱
炉に挿入して、加熱し透明化する光ファイバ用ガラス母
材の製造方法において、前記光ファイバ用多孔質ガラス
母材は、円柱状部とテーパ状部との境界部分に円柱状部
よりも拡径した部分を有し、且つ、該拡径した部分の表
面は円柱状部の表面よりも密度が高いことを特徴とする
光ファイバ用ガラス母材の製造方法。1. A glass preform for optical fibers, which is made transparent by inserting a porous glass preform for optical fibers having a tapered portion at one end of a cylindrical portion into a heating furnace through the tapered portion and heating the glass preform. In the manufacturing method, the porous glass preform for optical fibers has a portion having a diameter larger than that of the columnar portion at a boundary portion between the columnar portion and the tapered portion, and the surface of the diameter-expanded portion is A method for producing a glass preform for optical fibers, characterized in that the density is higher than the surface of the cylindrical portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12812295A JP3524209B2 (en) | 1995-05-26 | 1995-05-26 | Method for producing glass preform for optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12812295A JP3524209B2 (en) | 1995-05-26 | 1995-05-26 | Method for producing glass preform for optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08325028A true JPH08325028A (en) | 1996-12-10 |
| JP3524209B2 JP3524209B2 (en) | 2004-05-10 |
Family
ID=14976939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12812295A Expired - Lifetime JP3524209B2 (en) | 1995-05-26 | 1995-05-26 | Method for producing glass preform for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3524209B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015096458A (en) * | 2013-11-15 | 2015-05-21 | 住友電気工業株式会社 | Manufacturing method for optical fiber and manufacturing method for glass preform for optical fiber |
| US9856164B2 (en) * | 2015-01-09 | 2018-01-02 | Furukawa Electric Co., Ltd. | Optical fiber preform and method of manufacturing optical fiber |
-
1995
- 1995-05-26 JP JP12812295A patent/JP3524209B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015096458A (en) * | 2013-11-15 | 2015-05-21 | 住友電気工業株式会社 | Manufacturing method for optical fiber and manufacturing method for glass preform for optical fiber |
| US9856164B2 (en) * | 2015-01-09 | 2018-01-02 | Furukawa Electric Co., Ltd. | Optical fiber preform and method of manufacturing optical fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3524209B2 (en) | 2004-05-10 |
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