JPH1087338A - Drawing method - Google Patents
Drawing methodInfo
- Publication number
- JPH1087338A JPH1087338A JP24049496A JP24049496A JPH1087338A JP H1087338 A JPH1087338 A JP H1087338A JP 24049496 A JP24049496 A JP 24049496A JP 24049496 A JP24049496 A JP 24049496A JP H1087338 A JPH1087338 A JP H1087338A
- Authority
- JP
- Japan
- Prior art keywords
- chuck
- upper chuck
- optical fiber
- stretched
- stretching
- 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
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
Landscapes
- 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
【０００１】[0001]
【発明の属する技術分野】本発明はガラスの延伸方法に
関し、特に光ファイバ用母材等のロッド状ガラスの延伸
に好適な方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drawing glass, and more particularly to a method suitable for drawing rod-shaped glass such as a preform for an optical fiber.
【０００２】[0002]
【従来の技術】光ファイバはコア及びクラッドを有する
ロッド状透明ガラス体を作製し、これを線引可能な太さ
に延伸した後、線引炉において加熱溶融し、所定の線径
に引き延ばすことにより製造される。この光ファイバの
製造には延伸工程が必須である。図１は縦型の延伸機に
よる延伸工程の模式図であり、下方へ移動する上部チャ
ック及び上部チャックより高速で下方へ移動する下部チ
ャックで両端を把持された母材は抵抗炉で加熱され延伸
体となる。延伸体の外径を一定に保つために、例えば特
開平４−４８３７２６号公報には延伸開始端、中間部、
延伸終了端でチャック速度を変えて、延伸径を一定に保
つように工夫した方法が、また特開平４−３２４５２７
号公報には、母材ロッドの外径変動や延伸炉自体の熱伝
導などによる変動などにかかわらず，常に一定の延伸張
力で延伸するように延伸炉の投入電力を制御する方法が
提案されている。また光ファイバ製造過程での中間母材
を作成する工程でもしばしばロッド状ガラス体を延伸す
る必要がある。また、特開平４−３２４５２７号公報に
は、母材ロッドの外径変動や延伸炉自体の熱伝導などに
よる変動などにかかわらず，常に一定の延伸張力で延伸
するように延伸炉の投入電力を制御する方法が提案され
ている。2. Description of the Related Art An optical fiber is prepared by preparing a rod-shaped transparent glass body having a core and a clad, stretching it to a drawable thickness, heating and melting it in a drawing furnace, and drawing it to a predetermined wire diameter. It is manufactured by A drawing step is essential for the production of this optical fiber. FIG. 1 is a schematic diagram of a stretching process using a vertical stretching machine. A base material whose both ends are gripped by an upper chuck that moves downward and a lower chuck that moves downward at a higher speed than the upper chuck is heated in a resistance furnace and stretched. Be a body. In order to keep the outer diameter of the stretched body constant, for example, JP-A-4-483726 discloses a stretching start end, an intermediate portion,
Japanese Patent Laid-Open No. 4-324527 discloses a method in which the chuck speed is changed at the end of stretching to keep the stretching diameter constant.
Japanese Patent Application Laid-Open No. H11-163873 proposes a method for controlling the input power of the drawing furnace so that the drawing is always performed at a constant drawing tension regardless of the fluctuation of the outer diameter of the base material rod and the fluctuation of the heat of the drawing furnace itself. I have. Further, it is often necessary to stretch the rod-shaped glass body also in the step of preparing the intermediate preform in the optical fiber manufacturing process. Japanese Patent Application Laid-Open No. 4-324527 discloses that the power supplied to a drawing furnace is set so that the drawing furnace is always stretched at a constant drawing tension regardless of the outer diameter of the base material rod or the fluctuation due to the heat conduction of the drawing furnace itself. Control methods have been proposed.
【０００３】また、線引機の大きさにより線引母材の大
きさが制限されるため、図５に示すように、大型母材は
延伸されて延伸体〔図５（ａ）〕とした後に、数個の線
引可能な大きさに分割される〔図５（ｂ）〕のが一般的
である。なお、コア及びクラツドを含む部分を延伸体有
効部という。分割切断された延伸体は、その片端に、線
引機に取り付けるためのダミーロッドを融着されるが、
このときロッドの融着を確実に行なうために延伸体のダ
ミーロッド取り付け側端面はテーパー状に切削加工され
る。またダミーロッド取り付け側とは反対側の線引開始
端についても、端面が太いとその部分を溶融して線引を
開始することが困難になるので、その先端が細くなるよ
うにテーパー状に切削加工する。両端を切削加工された
状態を図５（ｃ）に示す。Ｌはテーパー部長さ、ｒは延
伸体の半径を表す。Further, since the size of the drawing base material is limited by the size of the drawing machine, as shown in FIG. 5, the large base material is drawn into a drawn body (FIG. 5 (a)). It is general that the image is later divided into several drawable sizes (FIG. 5B). The portion including the core and the clad is referred to as a stretched body effective portion. The divided body is fused with a dummy rod to be attached to a wire drawing machine at one end,
At this time, the end surface of the elongated body on the side where the dummy rod is attached is cut into a tapered shape in order to surely perform the fusion of the rod. Also, if the drawing start end on the opposite side to the dummy rod mounting side is too thick, it will be difficult to start drawing by melting that part, so it is tapered so that the tip becomes thinner Process. FIG. 5C shows a state where both ends are cut. L represents the length of the tapered portion, and r represents the radius of the stretched body.
【０００４】[0004]
【発明が解決しようとする課題】上述のように切断後の
延伸体はその切断面をテーパー状に切削加工されるわけ
であるが、外周を切削された部分はクラツド層が薄くな
り、コアとクラツドの比率が設計値からずれるため、光
ファイバとしての十分な特性が得られなくなる。つま
り、本来、光ファイバになる筈の有効部（光ファイバと
しての特性が良好な部分）が切断、切削により非有効部
（特性不良により光ファイバにならない部分）となって
しまうため、歩留りが低下してしまう。また、余計なテ
ーパー加工の工程も必要であり、光ファイバの製造コス
ト増につながる。本発明はこのような従来法の問題点を
解決して、歩留りの向上、製造コストの低減、作業性の
改善を可能とする延伸方法の提供を目的とする。As described above, the cut surface of the stretched body after cutting is cut into a tapered shape. However, in the portion where the outer periphery is cut, the clad layer becomes thinner, and the core and the core become thinner. Since the clad ratio deviates from the design value, sufficient characteristics as an optical fiber cannot be obtained. In other words, an effective portion (a portion having good characteristics as an optical fiber) that is supposed to become an optical fiber is cut and cut into an ineffective portion (a portion that does not become an optical fiber due to poor characteristics), thereby lowering the yield. Resulting in. In addition, an extra taper process is required, which leads to an increase in the manufacturing cost of the optical fiber. An object of the present invention is to solve the problems of the conventional method and to provide a stretching method capable of improving yield, reducing manufacturing cost, and improving workability.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
の手段として本発明は、(1) 光ファイバ用母材の両端を
上部チャック, 下部チャックでそれぞれ把持し抵抗炉に
より加熱しながら該上部チャックと該下部チャックを異
なる速度で移動させることにより該上部チャック，下部
チャック間距離を拡げ、これにより光ファイバ用母材を
延伸体とする方法において、延伸体の定常部の切断した
い位置において該延伸体が括れるように延伸することを
特徴とする延伸方法、(2) 上記上部チャック及び上記下
部チャックを共に下方に移動して延伸し、括れさせたい
部分において該上部チャックの速度を遅くするもしくは
停止させる、または該上部チャックを上方に移動するこ
とを特徴とする上記(1) 記載の延伸方法、(3) 上記上部
チャック及び上記下部チャックを共に下方に移動して延
伸し、括れさせたい部分において該下部チャックの速度
を速くすることを特徴とする上記(1) 又は(2) 記載の延
伸方法、(4) 上記延伸体の括れ部分の太さが直径２０ｍ
ｍ〜４０ｍｍであることを特徴とする上記(1) ないし
(3) のいずかに記載の延伸方法、を提供する。Means for Solving the Problems As means for solving the above-mentioned problems, the present invention provides (1) an optical fiber preform which is held at both ends by an upper chuck and a lower chuck, and heated by a resistance furnace, and By moving the chuck and the lower chuck at different speeds to increase the distance between the upper chuck and the lower chuck, thereby making the preform for optical fiber into a stretched body, at a position where a steady portion of the stretched body is desired to be cut, A stretching method characterized in that the stretched body is stretched so as to be narrowed, (2) the upper chuck and the lower chuck are both moved downward and stretched, and the speed of the upper chuck is reduced in a portion to be narrowed Or stopping, or moving the upper chuck upward, (3) the upper chuck and the lower chuck. The stretching method according to the above (1) or (2), characterized in that the lower chuck is moved downward together and stretched, and the speed of the lower chuck is increased in a portion to be constricted. The diameter of the constricted part is 20m in diameter
m to 40 mm, wherein
(3) The stretching method according to any one of (1) to (3).
【０００６】[0006]
【発明の実施の形態】図を参照して本発明を具体的に説
明する。本発明の延伸において装置構成は図１に示した
従来のものと同様であり、抵抗炉の上部チャック及び下
部チャックで母材の両端を把持し、母材の下部から順に
加熱しながら上部チャックを下部チャックより低速で下
方に送ることにより上部チャック，下部チャック間距離
を拡げ、これにより母材を延伸する。本発明において
は、延伸中に切断したい部分でチャック速度を変えて、
図２に示すように延伸体を括れさせテーパー部を形成す
る。これにより、テーパー部においてもコアとクラツド
の比率は一定に保たれており、テーパー部を光ファイバ
にすることができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described with reference to the drawings. In the stretching of the present invention, the apparatus configuration is the same as that of the conventional one shown in FIG. 1. The upper chuck and the lower chuck of the resistance furnace hold both ends of the base material, and the upper chuck is heated while heating in order from the lower part of the base material. By feeding the lower chuck at a lower speed than the lower chuck, the distance between the upper chuck and the lower chuck is increased, thereby stretching the base material. In the present invention, by changing the chuck speed at the portion to be cut during stretching,
As shown in FIG. 2, the stretched body is constricted to form a tapered portion. As a result, the ratio of the core to the clad is kept constant even in the tapered portion, and the tapered portion can be made into an optical fiber.
【０００７】本発明においては、上記のようにテーパー
部を光ファイバにすれば廃却される有効部体積は殆どな
くなる。仮に安全を見てテーパー部を廃却するとして
も、その体積は一般に切断後の延伸体１本につき、テー
パの長さＬ、半径ｒとしてπｒ 2 Ｌ以下である。これに
対し、前記した図５の従来法では、分割せずに線引すれ
ば全長が光ファイバとなる筈であったが、分割後のテー
パー加工により分割された延伸体１本につき２Ｌだけ有
効部分が短くなった。またテーパー部分により廃却され
る有効部の体積は切断後の延伸体一本につき２πｒ2 Ｌ
である。すなわち、本発明によれば廃却量は従来法の１
／２以下に低減される。In the present invention, as described above, the taper
If the optical fiber is used as the optical fiber, the effective volume
It becomes. Assuming safety and discarding the tapered part
In general, the volume of each stretched body after cutting is
Πr as length L and radius r TwoL or less. to this
On the other hand, in the conventional method of FIG.
If the entire length was supposed to be an optical fiber,
Only 2L per stretched body divided by par processing
The effect has been shortened. Also discarded by the tapered part
The volume of the effective part is 2πr per stretched body after cutting.TwoL
It is. That is, according to the present invention, the amount of waste is 1
/ 2 or less.
【０００８】本発明において、延伸中に有効部の切断し
たい部分を括れさせるには、その部分が抵抗炉で加熱さ
れている時に、上部チャックと下部チャックの相対的移
動速度を大にすればよいわけであるが、具体的には上部
チャック，下部チャックを下方に移動させる延伸におい
て、上部チャック速度を遅くするか、停止するか、ある
いは上部チャックを逆に上昇させることが効果的であ
る。延伸体の径に対して、加熱区間が短い場合には上部
チャック速度を遅くするだけで十分であるが、、延伸体
の径に対して加熱区間が長い場合には上部チャックを停
止、或いは逆に上昇させる等しないど、テーパー部が長
くなりすぎてしまう。また、この操作と同時に下部チャ
ックの下方への速度を速くすることも有効である。In the present invention, in order to narrow a portion of the effective portion to be cut during stretching, the relative movement speed of the upper chuck and the lower chuck may be increased when the portion is heated in a resistance furnace. However, specifically, in stretching in which the upper chuck and the lower chuck are moved downward, it is effective to reduce or stop the speed of the upper chuck or to raise the upper chuck in reverse. It is sufficient to lower the upper chuck speed when the heating section is short with respect to the diameter of the stretched body. However, when the heating section is long with respect to the diameter of the stretched body, the upper chuck is stopped or vice versa. Otherwise, the tapered portion becomes too long. It is also effective to increase the downward speed of the lower chuck simultaneously with this operation.
【０００９】本発明において延伸体に形成するテーパー
部形状としては、テーパー部の長さＬは、延伸体の半径
以上であれば短い方が好ましく、括れた部分の太さは外
径２０〜４０ｍｍ程度が好ましい。括れた部分が細けれ
ばガラスカッターでキズを入れるだけで簡単に切断でき
るが、４０ｍｍφ以上になると切断機などの大型設備が
必要となる。逆に２０ｍｍφ以下になると延伸途中で括
れ部が破損し、高温の溶融したガラスが落下する危険が
ある。In the present invention, as the shape of the tapered portion formed in the stretched body, the length L of the tapered portion is preferably shorter as long as it is equal to or larger than the radius of the stretched body, and the thickness of the constricted portion is 20 to 40 mm in outer diameter. The degree is preferred. If the constricted part is thin, it can be easily cut by simply scratching it with a glass cutter, but if it is 40 mmφ or more, large equipment such as a cutting machine is required. Conversely, if the diameter is less than 20 mmφ, the constricted portion is broken during stretching, and there is a risk that the high-temperature molten glass may fall.
【００１０】[0010]
〔実施例１〕外径１６０ｍｍφ、有効長１０００ｍｍの
母材を、図１の装置構成により外径８０ｍｍφに延伸し
た。１本の延伸体にすると有効長は４０００ｍｍとなる
が、本実施例ではこれに４つの括れを形成するように延
伸した後、５分割した。まず、定常部延伸時のチャック
速度は上部チャックが１０ｍｍ／分（下降）、下部チャ
ックが４０ｍｍ／分（下降）とし、上部チャックを２０
０ｍｍ／分送った時点で上部チャックを停止し、下部チ
ャックのみをそのままの速度で１００ｍｍ送った。その
後上部チャック速度を１０ｍｍ／分に戻し、定常の延伸
を行った。さらに５分割のために上部チャック送り長４
００ｍｍ、６００ｍｍ、８００ｍｍで同様の操作を行っ
た。得られた延伸体は図３に示すような形状をしてお
り、括れ部の外径は３５ｍｍφ、テーパー部長さは１０
０ｍｍであった。切断はガラスカッターで括れ部にキズ
を入れることで簡単に行え、切断に要した時間は４分間
であった。また、テーパー部を除いた延伸体有効部の長
さは合計で３６００ｍｍであった。Example 1 A base material having an outer diameter of 160 mm and an effective length of 1000 mm was stretched to an outer diameter of 80 mm by the apparatus configuration shown in FIG. The effective length is 4000 mm when one stretched body is used. In this embodiment, the stretched body is stretched so as to form four constrictions, and then divided into five. First, the chuck speed at the time of stretching the steady portion is 10 mm / min (down) for the upper chuck, 40 mm / min (down) for the lower chuck, and 20 mm for the upper chuck.
The upper chuck was stopped at the time of feeding 0 mm / min, and only the lower chuck was fed 100 mm at the same speed. Thereafter, the upper chuck speed was returned to 10 mm / min, and steady stretching was performed. Upper chuck feed length 4 for 5 divisions
The same operation was performed at 00 mm, 600 mm, and 800 mm. The obtained stretched body has a shape as shown in FIG. 3, the outer diameter of the constricted portion is 35 mmφ, and the length of the tapered portion is 10 mm.
It was 0 mm. Cutting was easily performed by scratching the constricted portion with a glass cutter, and the time required for cutting was 4 minutes. The length of the effective portion of the stretched body excluding the tapered portion was 3,600 mm in total.
【００１１】〔比較例１〕実施例１と同様、外径１６０
ｍｍφ、有効長１０００ｍｍの母材を、外径８０ｍｍφ
に延伸した。チャック速度は上部チャックが１０ｍｍ／
分（下降）、下部チャックが４０ｍｍ／分（下降）とし
て、最後まで一定の延伸を行った。延伸後、図４のよう
に切断機により延伸体を８００ｍｍ×５本に分割し、両
端をテーパーに加工した。切断作業には４０分間を要
し、テーパー加工には１時間３０分を要した。テーパー
部を除いた延伸体有効部の長さは合計で３２００ｍｍで
あった。[Comparative Example 1] As in Example 1, an outer diameter of 160
mmφ, base material of effective length 1000mm, outer diameter 80mmφ
Stretched. The chuck speed of the upper chuck is 10 mm /
Min (down), the lower chuck was set at 40 mm / min (down), and constant stretching was performed until the end. After stretching, the stretched body was divided into 800 mm × 5 pieces by a cutter as shown in FIG. 4 and both ends were tapered. The cutting operation required 40 minutes, and the tapering required 1 hour 30 minutes. The length of the effective portion of the stretched body excluding the tapered portion was 3,200 mm in total.
【００１２】〔実施例２〕実施例１と同様、外径１６０
ｍｍφ、有効長１０００ｍｍの母材を、図１の装置構成
により外径８０ｍｍφに延伸した。１本の延伸体にする
と有効長は４０００ｍｍとなるが、本実施例ではこれに
４つの括れを形成するように延伸した後、５分割した。
まず、定常部延伸時のチャック速度は上部チャックが１
０ｍｍ／分（下降）、下部チャックが４０ｍｍ／分（下
降）とし、上部チャックを２００ｍｍ／分送った時点
で、実施例１では上部チャックを停止させたが、本実施
例では上部チャック速度を２ｍｍ／分で上昇させ、下部
チャックのみをそのままの速度で１００ｍｍ送った。そ
の後上部チャック速度を１０ｍｍ／分（下降）に戻し、
定常の延伸を行った。さらに５分割のために上部チャッ
ク送り長４００ｍｍ、６００ｍｍ、８００ｍｍで同様の
操作を行った。得られた延伸体は括れを４つ有する形状
をしており、括れ部の外径は３０ｍｍφ、テーパー長Ｌ
は１２０ｍｍとなったが、延伸体有効部の長さは全体で
３２００ｍｍと実施例１と変わらなかった。[Embodiment 2] As in Embodiment 1, an outer diameter of 160
A base material having a diameter of mmφ and an effective length of 1000 mm was stretched to an outer diameter of 80 mmφ by the apparatus configuration shown in FIG. The effective length is 4000 mm when one stretched body is used. In this embodiment, the stretched body is stretched so as to form four constrictions, and then divided into five.
First, the chuck speed at the time of the steady portion stretching is 1 for the upper chuck.
The upper chuck was stopped at 0 mm / min (down), the lower chuck was 40 mm / min (down), and the upper chuck was stopped at 200 mm / min. / Min, and only the lower chuck was fed 100 mm at the same speed. After that, the upper chuck speed was returned to 10 mm / min (down),
A steady stretch was performed. The same operation was performed with the upper chuck feed lengths of 400 mm, 600 mm, and 800 mm for further division into five. The obtained stretched body has a shape having four constrictions, the outer diameter of the constricted part is 30 mmφ, and the taper length L
Was 120 mm, but the length of the effective portion of the stretched body was 3200 mm as a whole, which was the same as in Example 1.
【００１３】〔実施例３〕実施例１と同様に外径１６０
ｍｍφ、有効長１０００ｍｍの母材を、図１の装置構成
により外径８０ｍｍφに延伸した。１本の延伸体にする
と有効長は４０００ｍｍとなるが、本実施例ではこれに
４つの括れを形成するように延伸した後、５分割した。
まず、定常部延伸時のチャック速度は上部チャックが１
０ｍｍ／分（下降）、下部チャックが４０ｍｍ／分（下
降）とし、上部チャックを２００ｍｍ／分送った時点
で、実施例１では上部チャックを停止させたが、本実施
例では上部チャックの下降速度を２ｍｍ／分とし、下部
チャックのみをそのままの速度で１００ｍｍ送った。そ
の後上部チャック速度を１０ｍｍ／分（下降）に戻し、
定常の延伸を行った。さらに５分割のために上部チャッ
ク送り長４００ｍｍ、６００ｍｍ、８００ｍｍで同様の
操作を行った。得られた延伸体は括れを４つ有する形状
をしており、括れ部の外径は４０ｍｍφ、テーパー長Ｌ
は１００ｍｍとなり、延伸体有効部の長さは５本それぞ
れ１１０ｍｍ短くなった。従って、テーパー部を除いた
延伸体有効部の長さは合計で３５５０ｍｍであった。[Embodiment 3] An outer diameter of 160 as in Embodiment 1
A base material having a diameter of mmφ and an effective length of 1000 mm was stretched to an outer diameter of 80 mmφ by the apparatus configuration shown in FIG. The effective length is 4000 mm when one stretched body is used. In this embodiment, the stretched body is stretched so as to form four constrictions, and then divided into five.
First, the chuck speed at the time of the steady portion stretching is 1 for the upper chuck.
The upper chuck was stopped at 0 mm / min (down), the lower chuck was 40 mm / min (down), and the upper chuck was fed at 200 mm / min. Was set to 2 mm / min, and only the lower chuck was fed 100 mm at the same speed. After that, the upper chuck speed was returned to 10 mm / min (down),
A steady stretch was performed. The same operation was performed with the upper chuck feed lengths of 400 mm, 600 mm, and 800 mm for further division into five. The obtained stretched body has a shape having four constrictions, the outer diameter of the constricted part is 40 mmφ, and the taper length L
Was 100 mm, and the length of the effective portion of the stretched body was reduced by 110 mm for each of the five stretched bodies. Therefore, the total length of the stretched body effective portion excluding the tapered portion was 3550 mm.
【００１４】〔実施例４〕実施例３において、上部チャ
ックを下降速度２ｍｍ／分で下降させている間に、下部
チャックの下降速度を４０ｍｍ／分から８０ｍｍ／分
（下降）と速くして下部チャックを１００ｍｍ送った。
その後上部チャック速度を１０ｍｍ／分（下降）に戻
し、定常の延伸を行った。さらに５分割のために上部チ
ャック送り長４００ｍｍ、６００ｍｍ、８００ｍｍで同
様の操作を行った。得られた延伸体は実施例１と全く同
様の形状で、括れ部の径は３５ｍｍφ、テーパー長Ｌは
１００ｍｍ、延伸体有効長は合計３６００ｍと実施例３
より５０ｍｍ長くなった。[Embodiment 4] In Embodiment 3, while lowering the upper chuck at a lowering speed of 2 mm / min, the lowering speed of the lower chuck is increased from 40 mm / min to 80 mm / min (down), thereby lowering the lower chuck. Was sent 100 mm.
Thereafter, the upper chuck speed was returned to 10 mm / min (downward), and steady stretching was performed. The same operation was performed with the upper chuck feed lengths of 400 mm, 600 mm, and 800 mm for further division into five. The obtained stretched body had exactly the same shape as that of Example 1. The diameter of the constricted portion was 35 mm, the taper length L was 100 mm, and the effective length of the stretched body was 3600 m in total.
50 mm longer.
【００１５】[0015]
【発明の効果】以上説明のように、本発明によれば延伸
中にテーパー部を形成するので、延伸体の切断作業に大
型の切断機は必要なく、ガラスカッターで簡単に短時間
で切断できる。また、切削によるテーパー加工も不要
で、作業時間と製造コストのおはばな削減が可能であ
る。更に、テーパー部のコアとクラッドの比率が一定で
あり、テーパー部も光ファイバとして製品にすることが
可能である。仮に安全を見てテーパー部を廃却するとし
ても、延伸体定常部だけで比較しても、従来法より延伸
体定常部を長くすることができるので歩留りが向上す
る。As described above, according to the present invention, since a tapered portion is formed during stretching, a large-sized cutting machine is not required for cutting the stretched body, and the cutting can be easily performed in a short time with a glass cutter. . In addition, tapering by cutting is not required, and work time and manufacturing cost can be greatly reduced. Furthermore, the ratio of the core to the cladding in the tapered portion is constant, and the tapered portion can be made into a product as an optical fiber. Even if the taper portion is discarded in view of safety, even if only the stretched portion steady portion is compared, the yield is improved because the stretched portion steady portion can be made longer than the conventional method.
【図１】は本発明の方法を説明するための概略説明図で
ある。FIG. 1 is a schematic explanatory diagram for explaining a method of the present invention.
【図２】は本発明により得られた延伸体を説明するため
の概略断面図である。FIG. 2 is a schematic sectional view for explaining a stretched body obtained by the present invention.
【図３】は本発明の実施例１で得られた延伸体を説明す
る概略断面図であり、図中の数字は長さ（ｍｍ）を示
す。FIG. 3 is a schematic cross-sectional view illustrating a stretched body obtained in Example 1 of the present invention, and the numbers in the figure indicate lengths (mm).
【図４】は比較例１で得られた延伸体とその分割を説明
する概略断面図であり、図中の数字は長さ（ｍｍ）を示
す。FIG. 4 is a schematic cross-sectional view illustrating a stretched body obtained in Comparative Example 1 and division thereof, and the numbers in the figure indicate lengths (mm).
【図５】は従来法とそれにより得られる延伸体を説明す
るための概略断面図である。FIG. 5 is a schematic sectional view for explaining a conventional method and a stretched body obtained by the method.
Ｌ テーパー部長さ ｒ 延伸体の半径 L Length of taper part r Radius of stretched body
Claims (4)
下部チャックでそれぞれ把持し抵抗炉により加熱しなが
ら該上部チャックと該下部チャックを異なる速度で移動
させることにより該上部チャック，下部チャック間距離
を拡げ、これにより光ファイバ用母材を延伸体とする方
法において、延伸体の定常部の切断したい位置において
該延伸体が括れるように延伸することを特徴とする延伸
方法。1. An optical fiber preform according to claim 1, wherein both ends of the optical fiber preform are upper chucks.
The distance between the upper chuck and the lower chuck is increased by moving the upper chuck and the lower chuck at different speeds while gripping with the lower chuck and heating with a resistance furnace, thereby making the optical fiber base material into a stretched body. In the method, the stretching is performed so that the stretched body is constricted at a position at which a steady portion of the stretched body is to be cut.
共に下方に移動して延伸し、括れさせたい部分において
該上部チャックの速度を遅くするもしくは停止させる、
または該上部チャックを上方に移動することを特徴とす
る請求項１記載の延伸方法。2. The method according to claim 1, wherein the upper chuck and the lower chuck are both moved downward to extend and reduce or stop the speed of the upper chuck at a portion to be constricted.
2. The stretching method according to claim 1, wherein the upper chuck is moved upward.
共に下方に移動して延伸し、括れさせたい部分において
該下部チャックの速度を速くすることを特徴とする請求
項１又は請求項２記載の延伸方法。3. The stretching according to claim 1 or 2, wherein the upper chuck and the lower chuck are both moved downward to extend, and the speed of the lower chuck is increased at a portion to be constricted. Method.
ｍ〜４０ｍｍであることを特徴とする請求項１ないし請
求項３のいずかに記載の延伸方法。4. The thickness of the constricted portion of the stretched body is 20 m in outer diameter.
The stretching method according to any one of claims 1 to 3, wherein the length is from m to 40 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24049496A JPH1087338A (en) | 1996-09-11 | 1996-09-11 | Drawing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24049496A JPH1087338A (en) | 1996-09-11 | 1996-09-11 | Drawing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1087338A true JPH1087338A (en) | 1998-04-07 |
Family
ID=17060358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24049496A Pending JPH1087338A (en) | 1996-09-11 | 1996-09-11 | Drawing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1087338A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000128559A (en) * | 1998-10-16 | 2000-05-09 | Shinetsu Quartz Prod Co Ltd | Welding method |
| JP2000256028A (en) * | 1999-03-11 | 2000-09-19 | Shin Etsu Chem Co Ltd | Glass base material for optical fiber |
| JP2000264662A (en) * | 1999-03-12 | 2000-09-26 | Shin Etsu Chem Co Ltd | Preform for optical fiber and its production |
| JP2005015278A (en) * | 2003-06-26 | 2005-01-20 | Sumitomo Electric Ind Ltd | Method and apparatus for manufacturing optical fiber and extractor used for the manufacturing apparatus |
| WO2016024965A1 (en) * | 2014-08-13 | 2016-02-18 | Heraeus Tenevo Llc | Quartz glass article and method for forming a quartz glass optical component |
| JP2021006505A (en) * | 2020-09-29 | 2021-01-21 | ヘレーウス クオーツ ノース アメリカ エルエルシーＨｅｒａｅｕｓ Ｑｕａｒｔｚ Ｎｏｒｔｈ Ａｍｅｒｉｃａ ＬＬＣ | Quartz glass product and method for forming quartz glass optical member |
-
1996
- 1996-09-11 JP JP24049496A patent/JPH1087338A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000128559A (en) * | 1998-10-16 | 2000-05-09 | Shinetsu Quartz Prod Co Ltd | Welding method |
| JP2000256028A (en) * | 1999-03-11 | 2000-09-19 | Shin Etsu Chem Co Ltd | Glass base material for optical fiber |
| JP2000264662A (en) * | 1999-03-12 | 2000-09-26 | Shin Etsu Chem Co Ltd | Preform for optical fiber and its production |
| JP2005015278A (en) * | 2003-06-26 | 2005-01-20 | Sumitomo Electric Ind Ltd | Method and apparatus for manufacturing optical fiber and extractor used for the manufacturing apparatus |
| WO2016024965A1 (en) * | 2014-08-13 | 2016-02-18 | Heraeus Tenevo Llc | Quartz glass article and method for forming a quartz glass optical component |
| KR20170038070A (en) * | 2014-08-13 | 2017-04-05 | 헤래우스 테네보 엘엘씨 | Quartz glass article and method for forming a quartz glass optical component |
| CN107074612A (en) * | 2014-08-13 | 2017-08-18 | 赫罗伊斯·坦尼沃有限公司 | System and method for forming silica glass optical part |
| JP2017530925A (en) * | 2014-08-13 | 2017-10-19 | ヘレーウス テネーヴォ エルエルシーＨｅｒａｅｕｓ Ｔｅｎｅｖｏ Ｌｌｃ | Quartz glass product and method for forming quartz glass optical member |
| KR20180056798A (en) * | 2014-08-13 | 2018-05-29 | 헤래우스 테네보 엘엘씨 | Quartz glass article and method for forming a quartz glass optical component |
| JP2021006505A (en) * | 2020-09-29 | 2021-01-21 | ヘレーウス クオーツ ノース アメリカ エルエルシーＨｅｒａｅｕｓ Ｑｕａｒｔｚ Ｎｏｒｔｈ Ａｍｅｒｉｃａ ＬＬＣ | Quartz glass product and method for forming quartz glass optical member |
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