JPS63100032A - Glass tube and its production - Google Patents
Glass tube and its productionInfo
- Publication number
- JPS63100032A JPS63100032A JP24600486A JP24600486A JPS63100032A JP S63100032 A JPS63100032 A JP S63100032A JP 24600486 A JP24600486 A JP 24600486A JP 24600486 A JP24600486 A JP 24600486A JP S63100032 A JPS63100032 A JP S63100032A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- glass tube
- sol
- wet gel
- tubular wet
- 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
- 239000011521 glass Substances 0.000 title claims abstract description 74
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000011240 wet gel Substances 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 42
- -1 alkyl silicate Chemical compound 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 230000007062 hydrolysis Effects 0.000 claims description 4
- 238000006460 hydrolysis reaction Methods 0.000 claims description 4
- 230000003301 hydrolyzing effect Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000012445 acidic reagent Substances 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 2
- 239000000499 gel Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 15
- 239000013307 optical fiber Substances 0.000 abstract description 12
- 238000003980 solgel method Methods 0.000 abstract description 6
- 239000000243 solution Substances 0.000 description 14
- 239000002585 base Substances 0.000 description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000000151 deposition Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 239000012792 core layer Substances 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- 229910002012 Aerosil® Inorganic materials 0.000 description 1
- 101150110330 CRAT gene Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 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
- C03B37/014—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]
- C03B37/016—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] by a liquid phase reaction process, e.g. through a gel phase
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/12—Other methods of shaping glass by liquid-phase reaction processes
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明けＭＣＶＤ法による光７フイパ用母材製造の際出
発サポート管として用いられるガラス管とその製造方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a glass tube used as a starting support tube when manufacturing a base material for an optical 7 fiber by the MCVD method, and a method for manufacturing the same.
従来のＭＣＶＤ法による光７アイパ用母材製虐の際、出
発サポート管として用いられるガラス管は均質な石英ガ
ラス管でもつ念。When manufacturing the base material for Hikari 7 Eyepa using the conventional MCVD method, the glass tube used as the starting support tube must be a homogeneous quartz glass tube.
また、その従来の光フアイバ用母材製造に用いられるガ
ラス管の製造方法と１．ては、石英ガラスの原石である
水晶や砕石を粉砕しｔ後、グラファイトやモリブデンな
ど高＠度の融点を有するるつぼ内で溶融された石英ガラ
スとし、るつぼ底面の中心軸上に設けたダイスにより流
出させて石英ガラス管を製造する方法がありｅ、（１）
ま几最近ではゾル−ゲル法による製造方法も開発されて
いる。（特開昭６１−０９１０２５ （２１、特願昭６
０−０２６００２ （３））そのうち（２）では原料ゾ
ルとして、アルキルシリケートの加水分解溶液に微粉末
シリカを混合してなるゾルを用いる方法であり。In addition, a method for manufacturing a glass tube used for manufacturing a conventional optical fiber base material, and 1. After crushing quartz crystal or crushed stone, which is the raw stone of quartz glass, the quartz glass is melted in a crucible containing materials such as graphite or molybdenum that have a high melting point, and is then melted using a die placed on the center axis of the bottom of the crucible. There is a method of producing a quartz glass tube by draining it, (1)
Recently, a manufacturing method using a sol-gel method has also been developed. (JP-A-61-091025 (21, JP-A-61-091025
0-026002 (3)) Of these, method (2) uses a sol prepared by mixing finely powdered silica with a hydrolyzed solution of alkyl silicate as the raw material sol.
（３）では原料ゾルとして、マル千ルシリケートの酸性
試薬による加水分解溶液と、アル中ルシリケートの塩基
性試薬による加水分解溶液を混合してなるゾルを用い友
方法である。In (3), a sol obtained by mixing a solution of hydrolyzed marsilicate with an acidic reagent and a solution of hydrolyzed silicate in alkali with a basic reagent is used as the raw material sol.
〔発明？”−解決しようとする問題点〕従来のＭＯＶＤ
法による光フアイバ用母材製造の際、出発サポート管と
して用いられるガラス管は均質な石英ガラス管でありｔ
。〔invention? ”-Problem to be solved] Conventional MOVD
The glass tube used as the starting support tube during the production of optical fiber base material by the method is a homogeneous quartz glass tube.
.
均質な石英ガラス管のうち溶融法工製造され几ものと、
ゾルゲル法のうち特開昭６１−０９１０２３で製造 さ
れたものは、ガラスの純度が悪いという問題点ｈｚあり
た。そのためコストの高い気相法によって合成りうシト
層を厚く堆積させ几接に、コア層を堆積する几めＫ、光
フアイバ用母材の製造コストは高かつ念。Among the homogeneous quartz glass tubes, those manufactured using the fusion method are elaborate.
Among the sol-gel methods, the one produced in JP-A-61-091023 had the problem of poor glass purity. For this reason, the production cost of optical fiber base material is high and careful, as it involves depositing a thick synthetic resin layer using the expensive vapor phase method and carefully depositing the core layer.
ま几均質な石英ガラス管のうちゾルゲル法Ｎ。Among the homogeneous quartz glass tubes, the sol-gel method is used.
特願昭６０−０２６００！の方法で製造されたものはガ
ラスのＪｌｌ！Ｉｆが棟めて良いために、気相法による
合喫クラシト層の堆積工程ｈｓ不要になり、光フアイバ
用母材の製造コストを安くできるという長所がある反ｔ
１石英ガラス管そのものの価格６”−高いという問題点
がもった。Special application 1986-02600! Products manufactured using this method are glass Jll! Since If can be easily formed, there is no need for the process of depositing a joint crystal layer using a vapor phase method, and this method has the advantage of reducing the manufacturing cost of the base material for optical fibers.
1. The problem was that the cost of the quartz glass tube itself was 6'' high.
そこで本発明の目的は、上記の問題点を解決するもので
、ＭＯＶＤ 法による光フアイバ用母材の製造コストを
安くシ、シかもガラス管そのものの価格の安いガラス管
とその製造方法を提供するものである。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems, and to provide a glass tube and a method for manufacturing the same, which can reduce the manufacturing cost of an optical fiber base material by the MOVD method, and which can also reduce the cost of the glass tube itself. It is something.
本発明のガラス管は、第一のガラスの内側ｋ。 The glass tube of the present invention has an inner side k of the first glass.
第一のガラスよりも純度の高い第二のガラスが位置した
構造を有することを特徴とする。サポート管としては石
英系ガラス管が望ましく、と＜Ｋ。It is characterized by having a structure in which a second glass having higher purity than the first glass is located. A quartz-based glass tube is preferable as the support tube, and <K.
石英ガラス管あるいけフッ素がト°−プされた石英ガラ
ス管が望ましい。A quartz glass tube or a fluorine-topped quartz glass tube is preferable.
また１本発明のガラス管の製造方法としては。Further, as a method for manufacturing a glass tube according to the present invention.
第一のガラス原料となる第一のゾルを容器に入れ回転し
なｈ；らゲル化させて第一の管状のウェットゲルを作製
し、その後、第二のガラスの原料となりｇ＝のゾルを、
前記第二の管状ウェットゲルの孔の中に入れ、回転しな
がらゲル化させて、第一の管状のウェットゲルの内側に
第二の管状のウェットゲルが位置した構造の管状ウェッ
トゲルを作製し、その後、該管状ウェットゲルを乾燥・
焼結してガラス管を製造することを判徴とする。この時
、第一ノゾルとしては、アルキルシリケート加水分解し
てなる溶液に、シリカ微粉末を均−Ｋｍ加してなるゾル
を用い、第二のゾルとしては、フルキルケートの酸性試
薬による加水分解溶液と。The first sol, which will be the raw material for the first glass, is placed in a container and rotated to form a first tubular wet gel.Then, the sol, which will be the raw material for the second glass, is made into a gel. ,
A tubular wet gel having a structure in which the second tubular wet gel is located inside the first tubular wet gel is produced by inserting it into the hole of the second tubular wet gel and gelling it while rotating. , then dry the tubular wet gel.
It is characterized by the production of glass tubes by sintering. At this time, the first nosol is a sol obtained by adding -Km of fine silica powder to a solution obtained by hydrolyzing alkyl silicate, and the second sol is a solution obtained by adding -Km of fine silica powder to a solution obtained by hydrolyzing alkyl silicate. .
アル中ルシリケートの塩基性試薬による加水分解溶液を
混合して得られるゾルを用いることが更に望ましい。It is more desirable to use a sol obtained by mixing a hydrolysis solution of rusilicate in alkali with a basic reagent.
上記の構成によれば、ガラス管の内壁近傍にけ純度の良
いガラス層が位置しているので、ＭＯＶＤ法のコア層の
堆積に先だつクラット°層の堆積工程が不要になり、光
フアイバ用母材の製造コストの低減化＾ｔけかられる。According to the above structure, since the glass layer of high purity is located near the inner wall of the glass tube, the step of depositing a crat layer prior to the deposition of the core layer of the MOVD method is unnecessary, and the optical fiber substrate The cost of manufacturing materials will be reduced.
また、ガラス管の外側のガラス管の体積の大部分を占め
る領域は低純實の価格の安いガラスでよいので、ガラス
管自身の価格の価格も安い、まｔこの構造のガラス管は
、ゾルゲル法を用いて安価な製造コストで製造すること
が十分可能である。In addition, since the area on the outside of the glass tube that occupies most of the volume of the glass tube can be made of low-purity, inexpensive glass, the glass tube itself is also cheap. It is fully possible to manufacture it at low manufacturing cost using the method.
以下、実施例を用いて、本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail using Examples.
似）本発明のガラス管＠（第１図）
（１） 第一のゾルの作製
エチルシリケー）１３７２．９，９にα０２現定の塩酸
９５０１を加え、激しく攪拌して加水分解し加水分解溶
液を作製した。該加水分解溶液にアエロジルｏｘ−ｓｏ
（デグ峠社製）２６４ｇを超音波振動を与えな１′Ｉｔ
ら均一に添加した。その後濾過によって１μｍ以上の異
物を取り除いたのち０．１現宇のアンモニア水と水を用
すでＰＨ値を４９０に調整し、かつ体積を４０００ｙｎ
ｔＫｖｓ整し、第一のゾルを作製しｔ。Similar) Glass tube of the present invention @ (Fig. 1) (1) Preparation of first sol Add hydrochloric acid 9501 with α02 specification to ethyl silica) 1372.9, 9, stir vigorously to hydrolyze it, and form a hydrolyzed solution. Created. Aerosil ox-so is added to the hydrolyzed solution.
(manufactured by Degu Toge Co., Ltd.) Do not apply ultrasonic vibration to 264g.
was added uniformly. After that, foreign matter of 1 μm or more was removed by filtration, and the pH value was adjusted to 490 using 0.1 μm of aqueous ammonia and water, and the volume was adjusted to 4000 μm.
Adjust tKvs and prepare the first sol.
（１１）第二のゾルの作製
エチルシリケー）１６７８ｇ、無水エタノール５５８５
ｍｌ 、 ２９係アンモニア水１０９ｒｎｔ、 水
５８α６，９を混合し、２時間激しく攪拌しｔ後、冷暗
所にて静電しシリカ微粒子を成長させた。(11) Preparation of second sol Ethyl silica) 1678g, absolute ethanol 5585g
ml, 109rnt of 29th grade ammonia water, and 58α6,9% of water were mixed, stirred vigorously for 2 hours, and then electrostatically charged in a cool dark place to grow silica fine particles.
この溶液を減圧濃縮した後、乾燥工穆の歩留りを上げる
之めＫａ縮液のアルコール分を水と置換した。その伊、
酸性試薬による加水分解溶液と混合した際に急激なゲル
化を起こさないようＫＰＨ値を２規定の塩酸を用いて４
０に調整し、さらに、α６μｍのメンブランフィルタ−
を用いて濾過し、平均粒径［１１８μｍのシリカ微粒子
を含む溶液とした。After concentrating this solution under reduced pressure, the alcohol content of the Ka condensate was replaced with water in order to increase the yield of the drying process. That Italy,
The KPH value was adjusted to 4 using 2N hydrochloric acid to prevent rapid gelation when mixed with a hydrolysis solution using an acidic reagent.
0, and then a membrane filter of α6 μm.
The mixture was filtered to obtain a solution containing fine silica particles with an average particle size of 118 μm.
エチルシリケー） １３７２．９．９ Ｋ ［１０２現
定の塩酸５００ｇを加え、激しく攪拌して加水分解し、
加水分解溶液を作製した。Ethyl silica) 1372.9.9 K [102 Add 500 g of hydrochloric acid, stir vigorously to hydrolyze,
A hydrolysis solution was prepared.
前記二種類の溶液を混合し。その後α２現定のアンモニ
ア水と水を用いてＰＨ値を４゜６９に！■整し、かつ体
積を４０００ ｍｌ Ｋ ＦＪ整し、第二のゾルを作製
した。Mix the two solutions above. After that, use α2-specified ammonia water and water to adjust the pH value to 4°69! (2) The volume was adjusted to 4000 ml KFJ to prepare a second sol.
り！Ｄ ウェットゲルの作製
第一のゾルを、内径５０報、長さ１０００報（内寸）の
容器に入れ、フタをした後１６００ｒｐｍで回転させな
がらゲル化させて、第一の管状のウェットゲル（第１図
の１）を作製した。その後。the law of nature! D. Preparation of Wet Gel The first sol was placed in a container with an inner diameter of 50 mm and a length of 1000 mm (inner dimensions), and after the lid was closed, it was gelled while rotating at 1600 rpm to form the first tubular wet gel ( 1) in Fig. 1 was prepared. after that.
第二のゾルを、萌記第−の管状中エタウゲバ第１図の２
）の孔の中に入れ、回転しながらゲル化させて、第一の
管状のウェットゲルの内側に第二の管状のウェットゲル
が位置した構造の管状のウェットゲルを作製し友、ここ
で得られるガラス管の寸法ｎＩｆを確保するために、第
二のゾルの注入ｉｆ、容器を回転させ次マま行なっｔ０
４ψ 乾燥１焼結
前記管状のウェットゲルを２週間かけてゆつくり乾燥さ
せｔ後、所宇のプログラムに従って焼結すると、外径２
五２報、内径１５．２ｔ１１゜長さ４６３０の大きさを
もつ透明な石英ガラス管ｈ；得られた。そして、半径９
．６１１ｆｉを境界にして、それより外９１１が第一の
ゾルをｊ料とする石英ガラスであり、それより内側めｔ
第二のゾルを原料とする石英ガラスでＬ ツｆｅ。The second sol is placed in the tubular shape of the second sol in Figure 1, 2.
) and gelled while rotating to create a tubular wet gel with a structure in which a second tubular wet gel was placed inside the first tubular wet gel. In order to ensure the dimension nIf of the glass tube, the second sol injection if, the container is rotated and the injection is carried out every time t0.
4ψ Drying 1 Sintering The tubular wet gel is slowly dried over two weeks and then sintered according to the specified program, resulting in an outer diameter of 2.
A transparent quartz glass tube h having an inner diameter of 15.2t11° and a length of 4630° was obtained. And radius 9
．． With 611fi as the boundary, the outer part 911 is quartz glass using the first sol as a material, and the inner part 911
quartz glass made from the second sol.
（ｂ） 従来のガラス管■（第２図）従来の溶融法に
よるガラス管５け、外部より購入した（外径２５ｍ、内
径１９ｉ、長さ１ ｍ ）。(b) Conventional glass tubes ■ (Fig. 2) Five glass tubes manufactured by conventional melting method were purchased from outside (outer diameter 25 m, inner diameter 19 i, length 1 m).
（ｃｌ 従来のガラス管■（第２図）（ｔＬ）で合成
し友第−のゾルを用いて石英ガラス管３を作製した。ガ
ラス管の大きさＦ！■と同じである。(cl) A quartz glass tube 3 was prepared by synthesizing a conventional glass tube (Fig. 2) (tL) and using Tomoda's sol. The size of the glass tube is the same as F!■.
顧 従来のガラス管■（第３図）
社）で合成し九第二のゾルを用いて石英ガラス管４を作
製した。ガラス管の大きさけ０と同じである。A quartz glass tube 4 was prepared using a conventional glass tube (Fig. 3) using the 92 sol. The size of the glass tube is the same as zero.
上記４種類のガラス管を出発石英管として。ＭＯＶＤ法
ｐｃよってシングルモード光ファイバ（ＥＩＭＩＰ）の
母材を作製し之。ここで８ＭＦの製造コスト低減化のた
めに、合成りラッド層の堆積は行なわず１石英管の内壁
をエツチング後、すぐに０１１ドープトシリカガラスに
よるコア層を堆積することＫよって作製した。得られ７
ｔ４ｓ類の母材を線引きし、外径１２５μｍの光７アイ
パとした後、カットバック法によって伝送損失を測定し
、比較を行なっ九。まｆＥＩＭＦの製造コストを見積り
、比較を行なう九。結果を第１ｆＫ示す。The above four types of glass tubes are used as starting quartz tubes. A base material for a single mode optical fiber (EIMIP) was manufactured using the MOVD PC method. Here, in order to reduce the manufacturing cost of 8MF, a synthetic rad layer was not deposited, and a core layer of 011-doped silica glass was deposited immediately after etching the inner wall of a quartz tube. obtained 7
After drawing a T4S type base material to create an optical 7-eyeper with an outer diameter of 125 μm, the transmission loss was measured using the cutback method and compared. 9. Estimate and compare the manufacturing costs of EIMF. The results are shown in the first fK.
第１！！から明らかなように１本発明のガラス管は従来
のどのガラス管に比べても優れていることがわかった。1st! ! As is clear from the above, it was found that the glass tube of the present invention is superior to any conventional glass tube.
〔実施例２．〕
実施例ｔの（ａ）で作製した管状のウェットゲルを２週
間かけてゆっくり乾燥させ１１所定のプログラムに従っ
て焼結した。焼結工桿中にフッ素を導入することによっ
てフッ素をΔでα３悌含む石英Ｖ！ｈ″−得ちれ友（外
径２五２１．内径１５．２鶴、長さ４６３ ＋ｎ ）。[Example 2. ] The tubular wet gel prepared in Example t(a) was slowly dried over two weeks and sintered according to a predetermined program. Quartz V containing fluorine at α3° by introducing fluorine into the sintered rod! h″-Tokuchiretomo (outer diameter 2521.inner diameter 15.2mm, length 463+n).
そして実施例ｔのＵ）と同様半径９６＠ｆｉを境界にし
て、それより外側ｈｔ第一のゾルを原料とするフッ素が
ドープされた石英ガラスであり。As in U) of Example t, the radius 96@fi is the boundary, and the outside ht is fluorine-doped quartz glass made from the first sol as a raw material.
それより内側ｈ＝第二のゾルを原料とするフッ素がドー
プされた石英ガラスである。Inside h=fluorine-doped quartz glass made from the second sol.
該ガラス管の内壁をエツチング後、ＭＯＶＤ法により、
純シリカガラスによるコア層を堆積すること忙よって、
８ＭＦの母材を作製し友。得られた母材を線引きし、外
径１２５μｍの光ファイバとしｔ、該光ファイバの伝透
損失は実施例１のｉ）の場合と同じく小さかつｔ、ま九
日ＭＩＭ’）製造コストを見積っ之ところ、実施例１の
（α）の場合と同じ程度に安かった。After etching the inner wall of the glass tube, by MOVD method,
While we are busy depositing a core layer of pure silica glass,
I made a base material of 8MF. The obtained base material was drawn to form an optical fiber with an outer diameter of 125 μm, and the transmission loss of the optical fiber was as small as in i) of Example 1, and the manufacturing cost was estimated. However, it was as cheap as the case of (α) in Example 1.
以上述ぺたように、本発明のガラス管は、第一のガラス
の内側忙、第一のガラスよりも品質の良す第二のガラス
４（位置し＾１造を有する念めに、第一のガラスのみか
らなるガラス管に比べて、管内壁近傍の線質が良く、第
二のガラスのみからなるガラス管に比べて安価である。As mentioned above, the glass tube of the present invention has a second glass (4) of better quality than the first glass located inside the first glass. The radiation quality near the inner wall of the tube is better than that of a glass tube made of only second glass, and it is cheaper than a glass tube made of only second glass.
従ってＭＣＶＤ法における出発サポート管として、コス
トの高い合成りラッド堆積工稈がないこととそれ自身の
価格が安いこと等の理由から従来のガラス管より優れて
いる。またこのｆｊｌ造のガラス管は、ゾルゲル法を用
いて安価な製造コストで製造することが十分可能である
。従って、本発明け、加入者線の光７フイパ化にとって
必要な光ファイバの低価格化に大きく寄与すると確信す
る。Therefore, as a starting support tube in the MCVD method, it is superior to conventional glass tubes because there is no expensive synthetic rad deposition process and the price itself is low. Further, this FJL glass tube can be manufactured at low manufacturing cost using the sol-gel method. Therefore, we are confident that the present invention will greatly contribute to lowering the cost of optical fibers, which are necessary for converting subscriber lines into 7-fiber optical fibers.
第１図は本発明のガラス管■のＩ！Ｆ＋ｌｉＴ図である
。
１・・・・・・第一のガラス
２・・・・・・純ｉの高い第二のガラス第２図は実施ｆ
Ｉ１１で説明した従来のガラス管■および■の断面図で
ある。
３・・・・・・純度の悪い石英ガラス
第３図は実施例１で説明した従来のガラス管Φの断面図
である。
４・・・・・・純度の高い石英ガラス
以 上Figure 1 shows I! of the glass tube of the present invention. It is an F+liT diagram. 1...First glass 2...Second glass with high purity i Figure 2 shows implementation f
It is a sectional view of conventional glass tubes ① and ② explained in I11. 3... Silica glass with poor purity FIG. 3 is a cross-sectional view of the conventional glass tube Φ explained in Example 1. 4...High purity quartz glass or higher
Claims (5)
の高い第二のガラスが位置した構造を有することを特徴
とするガラス管。(1) A glass tube characterized by having a structure in which a second glass having higher purity than the first glass is placed inside the first glass.
第１項記載のガラス管。(2) The glass tube according to claim 1, wherein the glass tube is a quartz glass tube.
ある特許請求の範囲第１項記載のガラス管。(3) The glass tube according to claim 1, wherein the glass tube is a fluorine-doped quartz glass tube.
れ、回転しながらゲル化させて第一の管状のウェットゲ
ルを作製し、その後、第二のガラスの原料となる第二の
ゾルを、前記第一の管状ウェットゲルの孔の中に入れ、
回転しながらゲル化させて、第一の管状のウェットゲル
の内側に第二の管状のウェットゲルが位置した構造の管
状ウェットゲルを作製し、その後、該管状ウェットゲル
を乾燥・焼結してガラス管を製造することを特徴とする
ガラス管の製造方法。(4) Put the first sol, which will be the raw material for the first glass, into a container and gel it while rotating to create the first tubular wet gel, and then add the second sol, which will be the raw material for the second glass. put the sol into the pores of the first tubular wet gel,
A tubular wet gel having a structure in which a second tubular wet gel is positioned inside the first tubular wet gel is produced by gelling while rotating, and then the tubular wet gel is dried and sintered. A method for manufacturing a glass tube, the method comprising manufacturing a glass tube.
てなる溶液に、シリカ微粒子を均一に添加してなるゾル
であり、第二のゾルが、アルキルシリケートの酸性試薬
による加水分解溶液と、アルキルシリケートの塩基性試
薬による加水分解溶液を混合して得られるゾルであるこ
とを特徴とする特許請求の範囲第４項記載のガラス管の
製造方法。(5) The first sol is a sol obtained by uniformly adding silica fine particles to a solution obtained by hydrolyzing an alkyl silicate, and the second sol is a solution obtained by hydrolyzing an alkyl silicate with an acidic reagent, 5. The method for producing a glass tube according to claim 4, wherein the sol is obtained by mixing a hydrolysis solution of an alkyl silicate with a basic reagent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24600486A JPS63100032A (en) | 1986-10-16 | 1986-10-16 | Glass tube and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24600486A JPS63100032A (en) | 1986-10-16 | 1986-10-16 | Glass tube and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63100032A true JPS63100032A (en) | 1988-05-02 |
Family
ID=17142032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24600486A Pending JPS63100032A (en) | 1986-10-16 | 1986-10-16 | Glass tube and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63100032A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5123940A (en) * | 1990-02-23 | 1992-06-23 | At&T Bell Laboratories | Sol-gel doping of optical fiber preform |
-
1986
- 1986-10-16 JP JP24600486A patent/JPS63100032A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5123940A (en) * | 1990-02-23 | 1992-06-23 | At&T Bell Laboratories | Sol-gel doping of optical fiber preform |
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