JPH0940437A - Production of optical fiber - Google Patents
Production of optical fiberInfo
- Publication number
- JPH0940437A JPH0940437A JP19323395A JP19323395A JPH0940437A JP H0940437 A JPH0940437 A JP H0940437A JP 19323395 A JP19323395 A JP 19323395A JP 19323395 A JP19323395 A JP 19323395A JP H0940437 A JPH0940437 A JP H0940437A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- preform
- crucible
- clad
- clad glass
- 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.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000011521 glass Substances 0.000 claims abstract description 122
- 239000000463 material Substances 0.000 claims abstract description 72
- 238000003780 insertion Methods 0.000 claims abstract description 28
- 230000037431 insertion Effects 0.000 claims abstract description 28
- 238000002425 crystallisation Methods 0.000 claims abstract description 15
- 230000008025 crystallization Effects 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 abstract description 24
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract description 10
- 238000009792 diffusion process Methods 0.000 abstract description 8
- 229910052697 platinum Inorganic materials 0.000 abstract description 5
- 239000000835 fiber Substances 0.000 abstract description 2
- 239000011162 core material Substances 0.000 description 42
- 239000002585 base Substances 0.000 description 25
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 238000009987 spinning Methods 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
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
- C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光ファイバの製造方法
に係わり、特に多成分系ガラスからなる光ファイバの製
造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an optical fiber, and more particularly to a method for manufacturing an optical fiber made of multi-component glass.
【０００２】[0002]
【従来の技術】従来から、多成分系ガラス（例えば、Ｎ
ａ2 Ｏ−Ａｌ2 Ｏ3 −Ｂ2 Ｏ3 −ＳｉＯ2 等）の光ファ
イバを製造する方法には、二重るつぼ法や、特開昭52-4
31号公報に記載された一重るつぼを使用する方法などが
ある。2. Description of the Related Art Conventionally, multi-component glass (for example, N
a 2 O—Al 2 O 3 —B 2 O 3 —SiO 2 etc.), a double crucible method and Japanese Patent Laid-Open No. 52-4.
There is a method of using a single crucible described in Japanese Patent No. 31.
【０００３】二重るつぼ法は、同心円状に配置された白
金製の二重るつぼを用い、内側および外側のるつぼにコ
アガラスおよびクラッドガラスをそれぞれ装填して加熱
溶融させ、中心軸を合わせたノズルから引出し同時に線
引きも行なう方法である。In the double crucible method, platinum double crucibles arranged concentrically are used. Core glass and clad glass are loaded in the inner and outer crucibles respectively, and the crucibles are heated and melted. It is a method to draw from and draw at the same time.
【０００４】また、一重るつぼを用いる方法は、コアガ
ラスロッドの外側に多成分系ガラスクラッド材の粉末の
厚い層を形成した母材を、白金製等の紡糸用るつぼ内に
一定速度で下げてゆき、クラッド材の粉末を順次溶融、
脱泡させ、コア材とともに引取り紡糸する方法である。In the method using a single crucible, a base material having a thick layer of powder of a multi-component glass clad material formed on the outside of a core glass rod is lowered at a constant speed into a platinum-made crucible for spinning. Yuki, the powder of the clad material is sequentially melted,
This is a method in which defoaming is carried out and the core material is taken out and spun.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、これら
の多成分系ガラスファイバの製造方法においては、それ
ぞれ以下に示すような問題があった。However, each of these methods for producing a multi-component glass fiber has the following problems.
【０００６】すなわち、前者の二重るつぼ法では、コア
ガラスとクラッドガラスとの界面がるつぼに接触するた
め、るつぼ材料の滲出等によりファイバ特性の低下が生
じるという問題があった。これに対して後者の一重るつ
ぼを用いる方法では、特性低下を引起こすような不純物
の混入がほとんど生じないが、母材を吊り下げて延伸、
紡糸を行なうため、母材に融着可能なダミー棒を必要と
し、ダミー棒の選択が難しいという問題があった。That is, in the former double crucible method, since the interface between the core glass and the clad glass comes into contact with the crucible, there is a problem that the fiber characteristics are deteriorated due to leaching of the crucible material. On the other hand, in the latter method using a single crucible, mixing of impurities causing deterioration of characteristics hardly occurs, but the base material is suspended and stretched,
Since spinning is performed, a dummy rod that can be fused to the base material is required, and it is difficult to select the dummy rod.
【０００７】またいずれの方法においても、少なくとも
クラッドガラスの溶融、脱泡工程を経て紡糸が行なわれ
ており、冷却の際にガラス材料が結晶化温度を通過する
ことになるため、結晶化が生じるおそれがあった。ま
た、脱泡工程後に泡の有無を検査する必要があるが、こ
の検査が困難であった。In any of the methods, spinning is performed through at least the melting and defoaming steps of the clad glass, and the glass material passes the crystallization temperature during cooling, so that crystallization occurs. There was a fear. Further, it is necessary to inspect for the presence of bubbles after the defoaming step, but this inspection was difficult.
【０００８】さらに、高温でコアガラスとクラッドガラ
スとの界面が形成されるため、特にアルカリ金属のよう
に拡散係数の大きな成分を含むガラス材料を使用する場
合には、コアガラスとクラッドガラスとの接触時間を短
くしないと、成分元素の拡散によりガラスの変質が生じ
るおそれがあった。Furthermore, since the interface between the core glass and the clad glass is formed at a high temperature, when a glass material containing a component having a large diffusion coefficient such as an alkali metal is used, the core glass and the clad glass are separated from each other. Unless the contact time is shortened, there is a possibility that the glass may be altered due to the diffusion of the constituent elements.
【０００９】本発明はこれらの問題を解決するためにな
されたもので、母材を吊下げるためのダミー棒を必要と
せず、かつ結晶化並びにコアガラスとクラッドガラスと
の界面での成分元素の拡散を防止した光ファイバの製造
方法を提供することを目的とする。The present invention has been made in order to solve these problems, does not require a dummy rod for suspending the base material, and is capable of crystallization and of the constituent elements at the interface between the core glass and the clad glass. An object of the present invention is to provide a method of manufacturing an optical fiber that prevents diffusion.
【００１０】[0010]
【課題を解決するための手段】本発明の光ファイバの製
造方法は、中心軸に沿って挿入孔を有するクラッドガラ
ス材の前記挿入孔に、コアガラスロッドを挿着してなる
母材を、加熱手段を備えたるつぼ内に同軸的に収容した
後、前記加熱手段により、前記母材を前記クラッドガラ
スおよびコアガラスの結晶化温度より低い軟化温度に加
熱保持し、軟化した前記母材を前記るつぼの底部に開口
したノズル孔から引落としてプリフォームを形成し、次
いで得られたプリフォームを所望の線径に線引きするこ
とを特徴とする。According to the method of manufacturing an optical fiber of the present invention, a base material obtained by inserting a core glass rod into the insertion hole of a clad glass material having an insertion hole along the central axis is provided. After being coaxially housed in a crucible equipped with a heating means, by the heating means, the base material is heated and held at a softening temperature lower than the crystallization temperature of the clad glass and core glass, and the softened base material is It is characterized in that a preform is formed by dropping it from a nozzle hole opened at the bottom of the crucible, and then the obtained preform is drawn into a desired wire diameter.
【００１１】本発明において、光ファイバの母材を構成
する挿入孔を有するクラッドガラス材とコアガラスロッ
ドとは、それぞれ公知の方法で製造することができる
が、クラッドガラス材は、以下に示すように、本発明の
方法を応用して製造することもできる。In the present invention, the clad glass material having the insertion hole and the core glass rod constituting the base material of the optical fiber can be manufactured by known methods. The clad glass material is as follows. Also, the method of the present invention can be applied to manufacture.
【００１２】すなわち、中心に切削加工等により適当な
径の挿入孔を設けたクラッドガラス材の挿入孔に、石英
ガラスのようにクラッドガラスが軟化する温度では軟化
しない材料からなり、形成すべき挿入孔の内径に近い外
径を有するロッドを挿着し、この複合材を本発明と同様
にるつぼ内に収容し、るつぼを加熱することによりクラ
ッドガラスの軟化温度に加熱保持し、クラッドガラス材
だけをるつぼの底部のノズル孔から引落とす。こうし
て、本発明に使用される所望の内径の挿入孔を有するク
ラッドガラス材が得られる。That is, an insertion hole made of a material which does not soften at a temperature at which the cladding glass softens, such as quartz glass, is inserted into the insertion hole of the clad glass material having an insertion hole of an appropriate diameter formed at the center by cutting or the like. A rod having an outer diameter close to the inner diameter of the hole is inserted, and this composite material is housed in a crucible as in the present invention, and the crucible is heated to be maintained at the softening temperature of the clad glass. Withdraw from the nozzle hole at the bottom of the crucible. Thus, a clad glass material having an insertion hole with a desired inner diameter used in the present invention is obtained.
【００１３】[0013]
【作用】本発明の製造方法においては、クラッドガラス
材の中心軸に沿って設けられた挿入孔にコアガラスロッ
ドが挿着された母材が、ダミー棒で吊下げられることな
く、そのままるつぼ内に同軸的に収容される。そしてる
つぼ内で、コアガラスおよびクラッドガラスの結晶化温
度以下の軟化温度付近の温度に加熱保持され、軟化した
母材がるつぼ底部のノズル孔から引出されてプリフォー
ムが形成されるので、コアガラスおよびクラッドガラス
が結晶化温度を通過することなく引落とし成形がなさ
れ、したがってこれらのガラスの結晶化が生じない。In the manufacturing method of the present invention, the base material in which the core glass rod is inserted into the insertion hole provided along the central axis of the clad glass material is not hung by the dummy rod, but is placed in the crucible as it is. Is accommodated coaxially. Then, in the crucible, the preform is formed by being heated and maintained at a temperature near the softening temperature of the crystallization temperature of the core glass and the clad glass, and the softened base material is drawn out from the nozzle hole at the bottom of the crucible to form a preform. And the cladding glass is drawn without passing through the crystallization temperature, so that crystallization of these glasses does not occur.
【００１４】また、このように比較的低い温度でノズル
孔からの引落としがなされているので、コアガラスとク
ラッドガラスとの界面での成分元素の拡散が抑えられ、
変質が生じない。Further, since the ink is drawn from the nozzle hole at a relatively low temperature in this way, the diffusion of the constituent elements at the interface between the core glass and the clad glass is suppressed,
No alteration occurs.
【００１５】さらに本発明の方法では、粉末のガラス材
料を使用せず、かつ溶融工程を経ないで引落としを行な
っているので、脱泡の必要がない。また、プリフォーム
の状態で泡の有無を検査する必要がなく、引落とし前に
コアガラスロッドおよびクラッドガラス材中の泡の検査
を行なうだけで足りる。Further, in the method of the present invention, since the powdery glass material is not used and the drawing is performed without passing through the melting step, defoaming is not necessary. Further, it is not necessary to inspect the presence or absence of bubbles in the state of the preform, and it is sufficient to inspect the bubbles in the core glass rod and the clad glass material before the drawing.
【００１６】[0016]
【実施例】以下、本発明の実施例を図面を参照しながら
説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１７】図１は、本発明に係わる光ファイバの製造
方法の一実施例を説明するための断面図である。FIG. 1 is a sectional view for explaining an embodiment of a method for manufacturing an optical fiber according to the present invention.
【００１８】図において符号１は、中心に軸方向にコア
ガラス用挿入孔１ａが設けられたクラッドガラス材を示
し、符号２は、その挿入孔１ａに挿着されたコアガラス
ロッドを示している。In the figure, reference numeral 1 indicates a clad glass material having a core glass insertion hole 1a provided at the center in the axial direction, and reference numeral 2 indicates a core glass rod inserted into the insertion hole 1a. .
【００１９】クラッドガラス材１は、所定の成分を有す
る多成分系ガラス（例えば、Ｎａ2Ｏ−Ａｌ2 Ｏ3 −Ｂ
2 Ｏ3 −ＳｉＯ2 ）から成り、例えば溶融法で製造され
る。すなわち、底部のノズル孔に栓をしたるつぼ内で、
このクラッドガラス材を溶融、清澄後、石英ガラス等の
ガラスロッドを、このクラッドガラス材と反応が少ない
温度域でクラッドガラス材の中心に所定の温度まで泡の
巻き込みがないように挿入し、るつぼをクラッドガラス
材の結晶温度以下でかつクラッドガラス材の軟化温度に
冷却後加熱保持し、ノズル孔から引き落とすことで、コ
アガラス用挿入孔１ａを有するクラッドガラス材１を製
造することができる。The clad glass material 1 is a multi-component glass having a predetermined component (for example, Na 2 O-Al 2 O 3 -B).
2 O 3 —SiO 2 ) and is manufactured by, for example, a melting method. That is, in the crucible that plugs the nozzle hole at the bottom,
After melting and refining this clad glass material, insert a glass rod such as quartz glass into the center of the clad glass material in a temperature range where there is little reaction with the clad glass material so that no bubbles are entrained up to a predetermined temperature, and crucible. Is cooled to the softening temperature of the clad glass material or lower than the crystallization temperature of the clad glass material, heated and held, and pulled down from the nozzle hole, whereby the clad glass material 1 having the core glass insertion hole 1a can be manufactured.
【００２０】コアガラスロッド２は、クラッドガラス材
１と同様に多成分系ガラスから成り、引上げ法のような
公知の方法で作製する。そして、クラッドガラス材１の
挿入孔１ａの内径とコアガラスロッド２の外径とがほぼ
等しくなるようにし、コアガラスロッド２がクラッドガ
ラス材１の挿入孔１ａ内に密着した状態で保持されてい
るようにする。The core glass rod 2 is made of a multi-component glass like the clad glass material 1, and is manufactured by a known method such as a pulling method. Then, the inner diameter of the insertion hole 1a of the clad glass material 1 and the outer diameter of the core glass rod 2 are made substantially equal to each other, and the core glass rod 2 is held in a close contact with the inside of the insertion hole 1a of the clad glass material 1. To be
【００２１】このようにクラッドガラス材１とその挿入
孔１ａに挿着されたコアガラスロッド２とからなる母材
３を、ヒータ（電熱線）４ａが埋設された抵抗式の電気
炉４のような加熱手段を備え、底部にクラッドガラス材
１の外径よりも細径で形成すべきプリフォームのサイズ
に合わせた内径のノズル孔５が設けられたるつぼ６内に
同軸的に収容配置する。ここで、るつぼ６を構成する材
料としては、石英、白金その他の耐熱耐蝕性金属を用い
ることができる。また、るつぼ６底部に開口されたノズ
ル孔５の内径は、コアガラスおよびクラッドガラスの組
成とその組合せ、加熱軟化時のガラスの粘性等によって
決められる。さらに、母材３の外周は、るつぼ６の内壁
面に密着していても離れていても良い。The base material 3 composed of the clad glass material 1 and the core glass rod 2 inserted into the insertion hole 1a thereof is used as a resistance type electric furnace 4 in which a heater (heating wire) 4a is embedded. It is coaxially housed in a crucible 6 provided with a heating means and having a nozzle hole 5 having an inner diameter smaller than the outer diameter of the clad glass material 1 and adapted to the size of the preform to be formed at the bottom. Here, as the material forming the crucible 6, quartz, platinum or other heat resistant and corrosion resistant metal can be used. Further, the inner diameter of the nozzle hole 5 opened at the bottom of the crucible 6 is determined by the composition of the core glass and the clad glass and their combination, the viscosity of the glass at the time of heating and softening, and the like. Furthermore, the outer periphery of the base material 3 may be in close contact with or separated from the inner wall surface of the crucible 6.
【００２２】次いで、前記した加熱手段でるつぼ６を加
熱することにより、母材３を、コアガラスロッド２およ
びクラッドガラス材１を構成する多成分系ガラスの軟化
温度（これは、結晶化温度より低い）付近の温度に加熱
保持し、母材３を軟化させる。そして、加熱軟化した母
材３をるつぼ６底部のノズル孔５から引落とし、所望の
外径を有する円柱状のプリフォーム７を形成する。Next, the crucible 6 is heated by the above-mentioned heating means so that the base material 3 is softened at a temperature higher than the crystallization temperature of the multi-component glass constituting the core glass rod 2 and the clad glass material 1. The base material 3 is softened by heating and holding it at a temperature near (low). Then, the heat-softened base material 3 is dropped from the nozzle hole 5 at the bottom of the crucible 6 to form a cylindrical preform 7 having a desired outer diameter.
【００２３】得られたプリフォーム７は、さらに電気炉
等を通して加熱溶融させて引張ることにより、所望の線
径に線引きし光ファイバとする。なお、プリフォーム７
を加熱溶融し紡糸するための電気炉は、るつぼ６と別の
ラインに設置しても良いが、るつぼ６の下方に設置し、
プリフォーム７の形成から線引きまでの工程を連続的に
行なうことも可能である。The preform 7 thus obtained is further heated and melted through an electric furnace or the like to be drawn and drawn into a desired wire diameter to form an optical fiber. In addition, preform 7
The electric furnace for heating, melting and spinning can be installed in a line different from the crucible 6, but it is installed under the crucible 6 and
It is also possible to continuously perform the steps from forming the preform 7 to drawing.
【００２４】このように構成される本実施例において
は、クラッドガラス材１の挿入孔１ａにコアガラスロッ
ド２を挿着した母材３をるつぼ６内に収容し、コアガラ
スおよびクラッドガラス材料の軟化温度付近の温度で加
熱することで、軟化した前記母材３をノズル孔５から引
落としてプリフォーム７を形成しているので、母材３を
支持するためのダミー棒を必要としないうえに、コアガ
ラスおよびクラッドガラスの結晶化が防止され、結晶化
による特性低下が生じない。また、このように比較的低
い温度でノズル孔５からの引落としが行なわれているの
で、コアガラスとクラッドガラスとの界面での成分元素
の拡散が抑えられ、成分拡散による変質や界面の不整合
が生じない。In this embodiment having such a structure, the base material 3 in which the core glass rod 2 is inserted into the insertion hole 1a of the clad glass material 1 is housed in the crucible 6 to remove the core glass and the clad glass material. Since the preform 7 is formed by drawing the softened base material 3 from the nozzle hole 5 by heating at a temperature near the softening temperature, a dummy rod for supporting the base material 3 is not required and The core glass and the clad glass are prevented from being crystallized, and the characteristics are not deteriorated by the crystallization. In addition, since the withdrawal from the nozzle hole 5 is performed at a relatively low temperature as described above, the diffusion of the component elements at the interface between the core glass and the clad glass is suppressed, and the deterioration due to the component diffusion and the interface failure. Alignment does not occur.
【００２５】さらに、溶融工程を経ないでが行なわれて
いるので、脱泡の必要がない。Further, since it is carried out without passing through the melting step, defoaming is not necessary.
【００２６】なお、本実施例では、コアガラスロッド２
がクラッドガラス材１の挿入孔１ａ内に密着保持された
構造の母材３を使用した例について説明したが、クラッ
ドガラス材１とコアガラスロッド２との間に空隙がある
構造の母材を用いても、良好に引落しによるプリフォー
ム７の形成を行なうことができる。In this embodiment, the core glass rod 2 is used.
The example of using the base material 3 having a structure in which the clad glass material 1 is tightly held in the insertion hole 1a has been described, but a base material having a structure in which there is a gap between the clad glass material 1 and the core glass rod 2 is used. Even if it is used, the preform 7 can be favorably formed by pulling it down.
【００２７】すなわち、図２に示すように、先端部（下
部）が閉塞あるいは縮径された挿入孔８ａを有するクラ
ッドガラス材８の挿入孔８ａ内に、その内径よりもかな
り細径のコアガラスロッド２が緩く嵌め込まれた母材３
を使用することができる。また、図３に示すように、ク
ラッドガラス材１の挿入孔１ａ内にその内径よりもかな
り細径のコアガラスロッド２を緩く挿嵌するとともに、
クラッドガラス材１の下部に、クラッドガラスと同じガ
ラス材料または引落とし温度で軟化してるつぼ６内を汚
染することがない耐熱性材料からなる板状の部材９を当
接し、挿入孔１ａ内に嵌め込まれたコアガラスロッド２
を下側から支持して落下を防ぐように構成した母材３を
使用しても、同様な効果を上げることができる。That is, as shown in FIG. 2, in the insertion hole 8a of the clad glass material 8 having the insertion hole 8a whose front end (lower part) is closed or reduced in diameter, a core glass having a diameter much smaller than its inner diameter is inserted. Base material 3 with rod 2 loosely fitted
Can be used. Further, as shown in FIG. 3, a core glass rod 2 having a diameter considerably smaller than its inner diameter is loosely inserted into the insertion hole 1a of the clad glass material 1, and
A plate-like member 9 made of the same glass material as the clad glass or a heat-resistant material that does not contaminate the inside of the crucible 6 that is softened at the drawing temperature is brought into contact with the lower portion of the clad glass material 1 and is inserted into the insertion hole 1a. Core glass rod 2 fitted
The same effect can be obtained by using the base material 3 configured to support the above from below and prevent the base material from falling.
【００２８】以下、具体的実施例について説明する。Specific examples will be described below.
【００２９】多成分系ガラス（Ｎａ2 Ｏ−Ａｌ2 Ｏ3 −
ＳｉＯ2 ）から成り、図４に示す粘度特性を有するコア
ガラスおよびクラッドガラスを用い、10-4〜10-5Pa・s
の粘度の温度域で線引きを行ない、以下に示すようにし
て光ファイバを製造した。Multi-component glass (Na 2 O-Al 2 O 3-
SiO 2 ), using core glass and clad glass having the viscosity characteristics shown in FIG.
The optical fiber was manufactured as follows by drawing in the temperature range of viscosity.
【００３０】すなわち、まず引上げ法を用いて直径10mm
のコアガラスロッドを作製した。また、中心に切削加工
等により適当な径の挿入孔を設けたクラッドガラス材の
挿入孔に、コアガラスロッドとして直径12mmの石英ロッ
ドを挿着した複合材を、白金製の一重るつぼにセットし
て底部のノズル孔と軸合わせした後、るつぼをクラッド
ガラスの軟化温度付近の温度に加熱保持し、軟化したク
ラッドガラス材のみをノズル孔から引落とし、外径 125
mm、長さ 150mmで内径10.5mmのコアガラス用挿入孔を有
するパイプ状のクラッドガラス材を製造した。That is, first, the pulling method is used to obtain a diameter of 10 mm.
The core glass rod of was produced. In addition, a composite material in which a quartz rod with a diameter of 12 mm was inserted as a core glass rod into the insertion hole of the clad glass material that was provided with an insertion hole of an appropriate diameter in the center by cutting etc. was set in a platinum single crucible. After aligning it with the nozzle hole at the bottom, heat the crucible to a temperature near the softening temperature of the clad glass and pull down only the softened clad glass material from the nozzle hole.
A pipe-shaped clad glass material having an insertion hole for a core glass with an inner diameter of 10.5 mm and a length of 150 mm was produced.
【００３１】次いで、このクラッドガラス材の挿入孔に
前記コアガラスロッドを挿着し、白金製の一重るつぼで
850〜 950℃の温度に加熱してプリフォームを形成した
後、同一工程で線引きを行ない、外径 125μm 、コア径
20μm の光ファイバを定常的に得た。Then, the core glass rod is inserted into the insertion hole of the clad glass material, and a platinum single crucible is used.
After heating to a temperature of 850 to 950 ° C to form a preform, wire drawing is performed in the same process, outer diameter 125 μm, core diameter
A 20 μm optical fiber was constantly obtained.
【００３２】[0032]
【発明の効果】以上説明したように本発明の方法によれ
ば、母材の引落としの際に、コアガラスとクラッドガラ
スが結晶化温度を通過することがないので、結晶化が生
じず、特性の良好な光ファイバが得られる。また、比較
的低温で母材の引落としがなされているので、コアガラ
スとクラッドガラスとの界面での成分元素の拡散が抑え
られ、変質や界面の不整合が生じない。As described above, according to the method of the present invention, since the core glass and the clad glass do not pass the crystallization temperature during the drawing of the base material, crystallization does not occur, An optical fiber with good characteristics can be obtained. Further, since the base material is drawn off at a relatively low temperature, diffusion of the constituent elements at the interface between the core glass and the clad glass is suppressed, and alteration or interface mismatch does not occur.
【００３３】さらに、粉末のガラス材料を使用せず、溶
融工程を経ないで引落としを行なっているので、脱泡の
必要がない。Further, since the powdered glass material is not used and the drawing is performed without passing through the melting step, defoaming is not necessary.
【図１】本発明に係わる光ファイバの製造方法の一実施
例を説明するための断面図。FIG. 1 is a sectional view for explaining an embodiment of a method for manufacturing an optical fiber according to the present invention.
【図２】本発明の別の実施例を説明するための断面図。FIG. 2 is a cross-sectional view for explaining another embodiment of the present invention.
【図３】本発明のもう一つ別の実施例を説明するための
断面図。FIG. 3 is a cross-sectional view for explaining another embodiment of the present invention.
【図４】本発明の具体的実施例に使用するコアガラスお
よびクラッドガラスの粘度特性を表すグラフ。FIG. 4 is a graph showing viscosity characteristics of core glass and clad glass used in specific examples of the present invention.
１、８………クラッドガラス材 １ａ、８ａ………挿入孔 ２………コアガラスロッド ４………電気炉 ５………ノズル孔 ６………るつぼ ７………プリフォーム ９………板状の部材 1, 8 ... Clad glass material 1a, 8a ... Insertion hole 2 ... Core glass rod 4 ... Electric furnace 5 ... Nozzle hole 6 ... Crucible 7 ... Preform 9 ... ... Plate-shaped member
Claims (2)
ガラス材の前記挿入孔に、コアガラスロッドを挿着して
なる母材を、加熱手段を備えたるつぼ内に同軸的に収容
した後、前記加熱手段により、前記母材を前記クラッド
ガラスおよびコアガラスの結晶化温度より低い軟化温度
に加熱保持し、軟化した前記母材を前記るつぼの底部に
開口したノズル孔から引落としてプリフォームを形成
し、次いで得られたプリフォームを所望の線径に線引き
することを特徴とする光ファイバの製造方法。1. After a base material formed by inserting a core glass rod into the insertion hole of a clad glass material having an insertion hole along a central axis is coaxially housed in a crucible provided with a heating means. By the heating means, the preform is heated and maintained at a softening temperature lower than the crystallization temperature of the clad glass and the core glass, and the preform is drawn from the nozzle hole opened at the bottom of the crucible to soften the preform. A method for producing an optical fiber, which comprises forming and then drawing the obtained preform to a desired wire diameter.
ロッドが、いずれも多成分系ガラスから成る請求項１記
載の光ファイバの製造方法。2. The method for producing an optical fiber according to claim 1, wherein both the clad glass material and the core glass rod are made of multi-component glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19323395A JPH0940437A (en) | 1995-07-28 | 1995-07-28 | Production of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19323395A JPH0940437A (en) | 1995-07-28 | 1995-07-28 | Production of optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0940437A true JPH0940437A (en) | 1997-02-10 |
Family
ID=16304546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19323395A Pending JPH0940437A (en) | 1995-07-28 | 1995-07-28 | Production of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0940437A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013094460A1 (en) * | 2011-12-19 | 2013-06-27 | オリンパス株式会社 | Method for producing optical fiber, optical fiber, and endoscope |
| CN104817263A (en) * | 2015-04-18 | 2015-08-05 | 江苏师范大学 | Double-sleeve extrusion die for extruding chalcogenide glass optical fiber preform rod and use method |
| KR20190130367A (en) * | 2018-05-14 | 2019-11-22 | (주)옵토네스트 | method of manufacturing optical fiber |
-
1995
- 1995-07-28 JP JP19323395A patent/JPH0940437A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013094460A1 (en) * | 2011-12-19 | 2013-06-27 | オリンパス株式会社 | Method for producing optical fiber, optical fiber, and endoscope |
| JP5362140B1 (en) * | 2011-12-19 | 2013-12-11 | オリンパス株式会社 | Optical fiber manufacturing method, optical fiber, and endoscope |
| US8639078B2 (en) | 2011-12-19 | 2014-01-28 | Olympus Corporation | Optical fiber manufacturing method, optical fiber and endoscope |
| EP2689710A4 (en) * | 2011-12-19 | 2015-04-29 | Olympus Corp | Method for producing optical fiber, optical fiber, and endoscope |
| CN104817263A (en) * | 2015-04-18 | 2015-08-05 | 江苏师范大学 | Double-sleeve extrusion die for extruding chalcogenide glass optical fiber preform rod and use method |
| CN104817263B (en) * | 2015-04-18 | 2017-05-03 | 江苏师范大学 | Double-sleeve extrusion die for extruding chalcogenide glass optical fiber preform rod and use method |
| KR20190130367A (en) * | 2018-05-14 | 2019-11-22 | (주)옵토네스트 | method of manufacturing optical fiber |
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