JPS6321231A - Image guide - Google Patents

Image guide

Info

Publication number
JPS6321231A
JPS6321231A JP61165565A JP16556586A JPS6321231A JP S6321231 A JPS6321231 A JP S6321231A JP 61165565 A JP61165565 A JP 61165565A JP 16556586 A JP16556586 A JP 16556586A JP S6321231 A JPS6321231 A JP S6321231A
Authority
JP
Japan
Prior art keywords
cladding
image guide
rods
integrated
softening point
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
Application number
JP61165565A
Other languages
Japanese (ja)
Inventor
Hisanori Nakai
中居 久典
Kazushi Osuga
大須賀 一志
Kazuya Murakami
和也 村上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Cable Ltd
Original Assignee
Hitachi Cable Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP61165565A priority Critical patent/JPS6321231A/en
Publication of JPS6321231A publication Critical patent/JPS6321231A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01Manufacture of glass fibres or filaments
    • C03B37/012Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01211Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
    • C03B37/01214Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube for making preforms of multifibres, fibre bundles other than multiple core preforms
    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00Fibre product details, e.g. structure, shape
    • C03B2203/40Multifibres or fibre bundles, e.g. for making image fibres

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)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

PURPOSE:To develop the title image guide of excellent picture image quality by using the material having a softening temp. equal to or lower than that of a core part for a clad part and an array tube when plural picture element rods each consisting of the core part and the clad part are bundled, and the bundle is put in the array tube, heated, integrated, and drawn. CONSTITUTION:Plural picture element rods 4 each having the clad part 3 around the core part 2 are put in the array tube 1, and the material is heated, integrated, and then drawn to produce an integrated image guide. In this case, the clad part 3 is composed of two layers of the outside part and the inside part, and the inner diameters of the respective parts (a) and (b) are limited to conform to 1.05<=a/b<=1.12. The softening temps. of the clad part 3 and the array tube 1 are made equal to or lower than that of the core part glass. Such picture element rods 4 are arranged as shown in Figure 3, and heated and integrated. Since the gap 5 between the picture element rods 4 is filled with the softened clad part 3, the rods are integrated in the regular arrangement as shown in Figure 4, and a long-sized image guide of good picture image quality is obtained.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明はイメージガイドに係り、特に石英系一体型イメ
ージガイドに関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an image guide, and particularly to a quartz-based integrated image guide.

[従来の技術] 一般に、イメージガイドは多成分系ファイバを集束した
集合型イメージガイドと石英系ファイバを束ねて全長に
わたって一体化した一体型イメージガイドとに大別され
る。前者の集合型イメージガイドは高画質で可撓性に優
れている反面、その製造上長尺化が難しく通常5TrL
程度以下のものしか製造することができない。一方、後
者の一体型イメージガイドは画質及び可撓性の面で集合
型イメージガイドに劣るが、30m以上もの長尺化が可
能であり耐環境性にも優れているために、産業用として
は主に一体型イメージガイドが用いられている。
[Prior Art] In general, image guides are broadly classified into collective image guides in which multi-component fibers are bundled and integrated image guides in which quartz fibers are bundled and integrated over the entire length. The former grouped image guide has high image quality and excellent flexibility, but it is difficult to make it long due to manufacturing reasons, and it is usually 5TrL.
Only a small amount can be produced. On the other hand, the latter integrated image guide is inferior to the collective image guide in terms of image quality and flexibility, but it can be made longer than 30 meters and has excellent environmental resistance, so it is suitable for industrial use. An integrated image guide is mainly used.

この一体型イメージガイドは第15図(a)のように多
数の画素ロッド151を配列管内に規則正しく配列し、
これを加熱一体化(融着)してプリフォームを得た後、
このプリフォームを引き延ばして製造される。
This integrated image guide has a large number of pixel rods 151 arranged regularly in an arrangement tube as shown in FIG. 15(a),
After heating and integrating (fusion bonding) this to obtain a preform,
It is manufactured by stretching this preform.

[発明が解決しようとする問題点] しかしながら、プリフォームを得る際の融着条件により
、一体化時にプリフォーム内に気泡が発生することがあ
る。この気泡はプリフォームを引き延ばして製造された
イメージガイド内にそのまま存在し、画像伝送時に黒点
となって現われ画質を著しく劣化させてしまう。
[Problems to be Solved by the Invention] However, depending on the fusion conditions when obtaining the preform, bubbles may be generated within the preform during integration. These air bubbles remain in the image guide manufactured by stretching the preform, and appear as black spots during image transmission, significantly deteriorating the image quality.

気泡は画素ロッド表面の異物や寸法等によっても発生す
るが、発生の最も大きな原因は画素ロンド内各部の組成
に基づく軟化点の相違によるものと考えられている。一
般に、画素ロッドのコア部には高画質を得るために屈折
率を上げようとしてGeO2等のドーパントが多量に添
加されておりその軟化点は低くなっている。これに対し
て、クラッド部は純粋石英からなり高い軟化点を有して
いる。
Bubbles may also be generated due to foreign matter on the surface of the pixel rod, dimensions, etc., but the biggest cause of bubble generation is thought to be due to differences in softening points based on the composition of various parts within the pixel rod. Generally, a large amount of dopant such as GeO2 is added to the core portion of the pixel rod in order to increase the refractive index in order to obtain high image quality, and its softening point is low. On the other hand, the cladding part is made of pure quartz and has a high softening point.

従って、配列管内に配列された画素ロッドを加熱して隣
接する画素ロッドのクラッド部同志を軟化させ一体化さ
せようとすると、このときコア部は既に軟化して極めて
低粘度となっている。このため第15図(b)のように
画素ロッド151の剛性が失われて自重で変形し、画素
ロッド151間に溶は残し152が生じてこれが気泡に
成長してしまう。
Therefore, when an attempt is made to heat the pixel rods arranged in the array tube to soften and integrate the cladding parts of adjacent pixel rods, the core part has already softened and has an extremely low viscosity. As a result, as shown in FIG. 15(b), the pixel rods 151 lose their rigidity and are deformed by their own weight, leaving melt 152 between the pixel rods 151, which grows into bubbles.

さらに、極度な場合には気泡の発生のみでなく、融着時
に画素ロッドの配列が乱れ、その結果画像に断層が現わ
れることもある。
Furthermore, in extreme cases, not only bubbles may occur, but also the arrangement of pixel rods may be disturbed during fusion, resulting in the appearance of cross-sections in the image.

かくして、本発明の目的は上記従来技術の問題点を解消
し、気泡の発生や画素ロッドの配列の乱れを防止して画
質の向上を図ることができるイメージガイドを提供する
ことにある。
SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an image guide which can solve the problems of the prior art described above and improve image quality by preventing the generation of bubbles and disturbance of the arrangement of pixel rods.

[問題点を解決するための手段] 本発明のイメージガイドは上記目的を達成するために、
コア部と該コア部の外周部にこれを囲繞するように設け
られたクラッド部とからなる複数の画素ロッドを集束し
て配列管内に挿入し、これらを加熱一体化した後延伸し
て得られるイメージガイドにおいて、上記クラッド部及
び上記配列管が上記コア部と等しいかあるいは上記コア
部より低い軟化点を有するものである。
[Means for solving the problems] In order to achieve the above object, the image guide of the present invention has the following features:
A plurality of pixel rods consisting of a core part and a cladding part provided around the outer periphery of the core part are bundled and inserted into an array tube, heated and integrated, and then stretched. In the image guide, the cladding portion and the array tube have softening points equal to or lower than the core portion.

[作 用] 以上のような構成として一体化時の融着温度をクラッド
部及び配列管の溶融温度付近とすることにより、コア部
がその剛性を失うことなくクラッド部同志あるいはクラ
ッド部と配列管との融着を行なうことができる。従って
、気泡の発生や画素ロッドの配列の乱れが防止される。
[Function] With the above configuration, by setting the fusion temperature at the time of integration to around the melting temperature of the cladding part and the array tube, the core part can be bonded to each other or between the cladding part and the array tube without losing its rigidity. Can be fused with. Therefore, generation of bubbles and disturbance of the arrangement of pixel rods are prevented.

なお、各部の軟化点は屈折率制御用ドーパントであるG
eO2,P2O5、8203等の添加量ニヨッテ調整す
ることができる。
Note that the softening point of each part is determined by G, which is a dopant for controlling the refractive index.
The amount of addition of eO2, P2O5, 8203, etc. can be adjusted.

また、クラッド部を内側クラッドと外側クラッドとから
なる二重構造として外側クラッドの軟化点をコア部及び
内側クラッドのうち少なくともm=  5  = 方より低く設定してもよい。この場合、一体化時に外側
クラッドのみが溶融してコア部及び内側クラッドからな
るロッド間の空隙を埋めるものとして、外側クラッドの
半径aと内側クラッドの半径すとの関係が一体化に及ぼ
す影響を考えてみる。
Further, the cladding portion may have a double structure consisting of an inner cladding and an outer cladding, and the softening point of the outer cladding may be set to be lower than at least one of the core portion and the inner cladding. In this case, assuming that only the outer cladding melts during integration to fill the gap between the rods consisting of the core and inner cladding, the relationship between the radius a of the outer cladding and the radius of the inner cladding has an effect on integration. I'll think about it.

ロッド間の空隙は第11図のようにコア部111、内側
クラッド112及び外側クラッド113からなる画素ロ
ッドが理想的な高密度配列をなした場合に最も小さく、
第13図のように画素ロッドが正方形状に配列した場合
に最大となる。
The gap between the rods is the smallest when the pixel rods made up of the core part 111, the inner cladding 112, and the outer cladding 113 form an ideal high-density arrangement as shown in FIG.
It is maximum when the pixel rods are arranged in a square shape as shown in FIG.

そこで、まず第11図に示す外側クラッド113の斜線
部が溶融して第12図の如く内側クラッド112間の空
隙にちょうど埋まる状態を考える。第11図の斜線部の
面積S1と第12図の斜線部の面積S2とを外側クラッ
ド113及び内側クラッド112の各半径a及びbを用
いて表わすと、 51=7C(a2−b2)/2    ・’−(1)s
2−<5−π/2 ) b2     ・・・ (2)
となり、これらの面積S1及びS2が等しい場合−〇 
− に上記の状態となるので、このとぎ(1) (21式よ
りa/b−σ5/yr= 1.05   ・(31の関
係が導かれる。
First, let us consider a situation in which the shaded portion of the outer cladding 113 shown in FIG. 11 melts and just fills the gap between the inner claddings 112 as shown in FIG. 12. If the area S1 of the shaded area in FIG. 11 and the area S2 of the shaded area in FIG.・'-(1)s
2-<5-π/2) b2... (2)
So, if these areas S1 and S2 are equal -〇
- Since the above state is reached, the following relationship (1) (a/b-σ5/yr=1.05/(31) is derived from equation 21.

また、同様にして第13図に示す外側クラッド113の
斜線部が溶融して第14図の如く内側クラッド112間
の空隙にちょうど埋まる場合、第13図の斜線部分の面
積S3及び第14図の斜線部の面積S4が S3 =π(a2−b2)     −[4)S4−(
4−π)b2     ・・・ (5)と表わされるの
で、このとき a/b=  2/@=  1.12     −e)と
なる。
Similarly, if the shaded portion of the outer cladding 113 shown in FIG. 13 melts and fills the gap between the inner cladding 112 as shown in FIG. 14, the area S3 of the shaded portion in FIG. The area S4 of the shaded part is S3 = π(a2-b2) - [4) S4-(
4-π)b2 (5), so in this case a/b=2/@=1.12-e).

上述したように、ロッド間の空隙は第11図の場合最小
に、第13図の場合最大になるので、この空隙を埋める
ための外側クラツド径aの内側クラツド径すに対する比
a/bは(31G1式より1.05≦a/b≦ 1.1
2 であることが望ましい。
As mentioned above, the gap between the rods is the minimum in the case of FIG. 11 and the maximum in the case of FIG. 13, so the ratio a/b of the outer cladding diameter a to the inner cladding diameter to fill this gap is ( From formula 31G1, 1.05≦a/b≦1.1
2 is desirable.

a/bが1.05未満の場合には溶着しても外側クラッ
ド113の厚さが不足してロッド間の空隙を埋めること
ができず、a/bが1.12より大きい場合には外側ク
ラッド113が厚過ぎて溶着時に画素ロッドが流れ、配
列乱れを生じてしまう。
If a/b is less than 1.05, the thickness of the outer cladding 113 will be insufficient to fill the gap between the rods even if welded, and if a/b is greater than 1.12, the outer cladding 113 will not be able to fill the gap between the rods. If the cladding 113 is too thick, the pixel rods will flow during welding, resulting in disordered arrangement.

[実施例] 以下、本発明の実施例を添付図面に従って説明する。[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

実施例1 第1図に示すように配列管1内にコア部2及びクラッド
部3からなる画素ロッド4を多数本挿入し、これを加熱
一体化した後、延伸して一体型イメージガイドを製造し
た。
Example 1 As shown in Fig. 1, a large number of pixel rods 4 consisting of a core part 2 and a cladding part 3 are inserted into an array tube 1, and after heating and integrating them, they are stretched to produce an integrated image guide. did.

ここで、SiO2ガラスに添加する各種ドーパントの添
加量とドーパントが添加されたSiO2ガラスの軟化点
との関係を第2図に示す。本実施例ではコア部2にGe
O2を添加してコア部2の純粋5102ガラスに対する
比屈折率差Δを2%に設定すると共に、クラッド部3及
び配列管1に8203あるいはP2O5を添加してコア
部2の軟化点TOより低い軟化点を持たせた。B2O3
あるいはP2O5の添加量は第2図においてコア部2と
等しい軟化点T。
Here, FIG. 2 shows the relationship between the amounts of various dopants added to SiO2 glass and the softening point of SiO2 glass to which the dopants have been added. In this embodiment, the core part 2 contains Ge.
O2 is added to set the relative refractive index difference Δ of the core part 2 with respect to pure 5102 glass to 2%, and 8203 or P2O5 is added to the cladding part 3 and the array tube 1 to lower the softening point TO of the core part 2. It has a softening point. B2O3
Alternatively, the amount of P2O5 added is equal to the softening point T of the core portion 2 in FIG.

となる量C1あるいはC2より多くすればよく、その上
限C3は熱歪の増大によるクラック発生等の製造限界に
よって決定される。
The upper limit C3 is determined by manufacturing limitations such as the occurrence of cracks due to an increase in thermal strain.

具体的には、コア部2に13mo1%のGeO2が添加
された5i02ガラス(軟化点1470℃、Δ−2%)
を、クラッド部3及び配列管1に2mo 1%以上13
mo 1%以下の8203あるいはP2O5が添加され
た5102ガラス(軟化点1000℃以上1470℃未
満、Δ−±0.1%)を使用した。
Specifically, 5i02 glass with 13 mo1% of GeO2 added to the core part 2 (softening point: 1470°C, Δ-2%)
2mo 1% or more 13 in the cladding part 3 and array tube 1
8203 with an mo of 1% or less or 5102 glass to which P2O5 was added (softening point of 1000°C or more and less than 1470°C, Δ-±0.1%) was used.

このような画素ロッド4を第3図のように配列してこれ
らを加・熱一体化すると、まず始めにクラッド部3が軟
化して画素ロッド4間の空隙5を埋める。このとき、コ
ア部2はまだ軟化せず剛性を保っているので自重で曲が
ることもなく、第4図のように規則正しい配列のまま一
体化される。
When such pixel rods 4 are arranged as shown in FIG. 3 and heated and integrated, the cladding portion 3 first softens and fills the gaps 5 between the pixel rods 4. At this time, the core portion 2 has not yet softened and maintains its rigidity, so it does not bend under its own weight and is integrated with the regular arrangement as shown in FIG.

以上のようにして、気泡発生のない画質の良好な長尺イ
メージガイドが得られた。
In the manner described above, a long image guide with good image quality and no bubbles was obtained.

また、コア部2に7mo 1%のGeO2が添加された
5102ガラス(軟化点1530℃、Δ−1%)を、ク
ララド部3及び配列管1に1m01%m01%以上1亢
(軟化点1000℃以上1530℃未満,Δ−±0.0
5%)を使用したところ、同様に高品質のイメージガイ
ドを得ることができた。
In addition, 5102 glass (softening point 1530°C, Δ-1%) to which 7mo 1% GeO2 is added is used in the core part 2, and 5102 glass (softening point 1530°C, Δ-1%) with 1m01% or more of GeO2 added (softening point 1000°C) is used in the clarad part 3 and the array tube 1. Above 1530℃, Δ-±0.0
5%), similarly high quality image guides could be obtained.

なお、コア部2に純粋5i02ガラスを、クラッド部3
及び配列管1に8203あるいはP2O5が添加された
5102ガラスを用いてもよい。
Note that the core part 2 is made of pure 5i02 glass, and the clad part 3 is made of pure 5i02 glass.
Alternatively, 8203 or 5102 glass added with P2O5 may be used for the array tube 1.

さらに、5i02ガラスにB2O3及びP2O5を添加
すると第5図のようにその屈折率はそれぞれ低減及び増
加される。従って、軟化点を下げようとしてクラッド部
3及び配列管1に8203あるいはP2O5を多量に添
加するとそれだけ屈折率が変化し、イメージガイドのN
Aが劣化してしまう。そこで、B2O3とP2O5とを
同時に添加して十分な軟化点を得ながらも屈折率を変化
させずに高いNAを得ることができる。例えば、B2O
3及びP2O5の添加による屈折率の低下分Δnと増加
分Δnとを等しくする添加量C4及びC5を用いれば、
クラッド部3及び配列管1の屈折率は純粋5i02ガラ
スと等しくなる。
Furthermore, when B2O3 and P2O5 are added to 5i02 glass, its refractive index is decreased and increased, respectively, as shown in FIG. Therefore, if a large amount of 8203 or P2O5 is added to the cladding part 3 and the array tube 1 in an attempt to lower the softening point, the refractive index changes accordingly, and the N of the image guide
A deteriorates. Therefore, by adding B2O3 and P2O5 simultaneously, a high NA can be obtained without changing the refractive index while obtaining a sufficient softening point. For example, B2O
If the addition amounts C4 and C5 are used to make the decrease Δn and the increase Δn in the refractive index due to the addition of 3 and P2O5 equal,
The refractive index of the cladding part 3 and the array tube 1 is equal to that of pure 5i02 glass.

実施例2 上述した実施例1と同様にしてクラッド部3及び配列管
1の軟化点をコア部2と等しく設定したイメージガイド
を製造した。
Example 2 An image guide was manufactured in the same manner as in Example 1 described above, in which the softening points of the cladding part 3 and the array tube 1 were set to be equal to those of the core part 2.

具体的には、コア部2に6mo 1%のGeO2が添加
された5i02ガラス(軟化点1540℃、Δ−1%)
を、クラッド部3及び配列管1に2mo 1%のB2O
3あるいは1m01%のP2O5が添加されたSiO2
ガラス(軟化点1540℃、八−〇、1%)を使用する
ことにより、気泡が全く発生しないイメージガイドを得
ることができた。
Specifically, 5i02 glass with 6mo 1% GeO2 added to the core part 2 (softening point 1540°C, Δ-1%)
2mo 1% B2O in the cladding part 3 and array tube 1
SiO2 doped with 3 or 1m01% P2O5
By using glass (softening point: 1540° C., 8-0, 1%), an image guide without any bubbles could be obtained.

また、コア部2に12mo1%のGeO2が添加された
5i02ガラス(軟化点1470℃、Δ−2%)を、ク
ラッド部3及び配列管1に3mo 1%の8203が添
加された5t02ガラス(軟化点1410℃、Δ−0,
2%)あるいは2.5 mo1%のP2O5が添加され
た5i02ガラス(軟化点1470℃、Δ−0,1%)
を使用しても同様に高品質のイメージガイドが得られた
In addition, 5i02 glass (softening point 1470°C, Δ-2%) doped with 12 mo 1% GeO2 was used in the core part 2, and 5t02 glass (softened Point 1410℃, Δ-0,
2%) or 5i02 glass doped with 2.5 mo1% P2O5 (softening point 1470°C, Δ-0.1%)
Similarly high quality image guides were obtained using the .

実施例3 第6図に示すようにコア部61とコア部61を囲繞する
内側クラッド62と内側クラッド62を囲繞する外側ク
ラッド63とからなる多数本の画素ロッド64を配列管
(図示せず)内に挿入し、これを加熱一体化した後、延
伸して一体型イメージガイドを製造した。
Embodiment 3 As shown in FIG. 6, a large number of pixel rods 64 consisting of a core part 61, an inner clad 62 surrounding the core part 61, and an outer clad 63 surrounding the inner clad 62 are arranged in a tube (not shown). After heating and integrating the image guide, an integrated image guide was manufactured by stretching the image guide.

なお、コア部61にGeO2が添加された高屈折率の8
102ガラスを、内側クラッド62に純粋5102ガラ
スを、外側クラッド63にB2O3及びP2O5が添加
されて純粋5i02ガラスと同じ屈折率を有すると共に
軟化点が低下したSiO2ガラスを用いて画素ロッド6
4に第7図に示すような屈折率分布を持たせた。
Note that the core part 61 has a high refractive index of 8 to which GeO2 is added.
102 glass, pure 5102 glass for the inner cladding 62, and SiO2 glass doped with B2O3 and P2O5 to have the same refractive index as pure 5i02 glass and a lower softening point for the outer cladding 63.
4 had a refractive index distribution as shown in FIG.

また、外側クラッド63の外径2aと内側クラッド62
の外径2bとの間に 105≦a/b≦1.12 の関係を持たせた。
In addition, the outer diameter 2a of the outer cladding 63 and the inner cladding 62
The relationship of 105≦a/b≦1.12 was established between the outer diameter 2b of

このような画素ロッド64を多数本配列管内に挿入して
これらを加熱一体化すると、まず外側クラッド63が軟
化して各ロッド間の空隙を埋める。
When a large number of such pixel rods 64 are inserted into the array tube and heated and integrated, the outer cladding 63 first softens and fills the gaps between the rods.

このとき、内側クラッド62は外側クラッド63より高
い軟化点を有しているのでまだ軟化せず剛性を保ってい
る。従って、気泡発生や配列乱れのないイメージガイド
が製造される。
At this time, since the inner cladding 62 has a higher softening point than the outer cladding 63, it has not yet softened and maintains its rigidity. Therefore, an image guide without bubble generation or disordered arrangement can be manufactured.

なお、第8図や第9図のように外側クラッド63の屈折
率が純粋5i02ガラスからなる内側クラッド62より
低いあるいは高い分布を有する画素ロッドを用いてイメ
ージガイドを製造することもできる。このような外側ク
ラッド63の屈折率は5i02ガラスに添加するドーパ
ント(Ge、8.P。
Note that, as shown in FIGS. 8 and 9, it is also possible to manufacture an image guide using a pixel rod in which the outer cladding 63 has a distribution in which the refractive index is lower or higher than that of the inner cladding 62 made of pure 5i02 glass. The refractive index of such an outer cladding 63 is determined by the dopant (Ge, 8.P) added to the 5i02 glass.

F等〉の種類及び量により設定することができるが、こ
の外側クラッド63の軟化点をコア部61及び内側クラ
ッド62のうち少なくとも一方より低く設定すれば、同
様にして高品質のイメージガイドが得られる。
F, etc.), but if the softening point of the outer cladding 63 is set lower than at least one of the core portion 61 and the inner cladding 62, a high-quality image guide can be obtained in the same way. It will be done.

実施例4 第10図のようにコア部101を囲繞するクラッド部1
02としてその外側に向かう程屈折率が低く且つ軟化点
が低い材料を用いてイメージガイドを製造した。このよ
うな画素ロッドはクラッド部102にその外側に向かう
程多量のFやBからなる屈折率低減ドーパントを添加す
ることによって得られ、例えばVAD法で画素ロッドを
製造する際にクラッド部のかさ密度と焼結時に供給する
ドーパントの流量を制御すればよい。
Example 4 Cladding part 1 surrounding core part 101 as shown in FIG.
An image guide was manufactured using a material having a lower refractive index and a lower softening point toward the outside as 02. Such a pixel rod is obtained by adding a refractive index reducing dopant made of F or B to the cladding part 102 in increasing amounts toward the outside.For example, when manufacturing a pixel rod by the VAD method, the bulk density of the cladding part is reduced. What is necessary is to control the flow rate of the dopant supplied during sintering.

この画素ロッドを多数本配列管内に挿入してこれらを加
熱一体化すると、まずクラッド部102の外側部から徐
々に軟化するので、コア部101の剛性を失うことなく
各ロッド間の空隙を埋めることができる。
When a large number of these pixel rods are inserted into an array tube and heated and integrated, the outer part of the cladding part 102 gradually softens, so that the gaps between the rods can be filled without losing the rigidity of the core part 101. Can be done.

[発明の効果] 以上説明したように本発明によれば、次の如き優れた効
果を発揮する。
[Effects of the Invention] As explained above, according to the present invention, the following excellent effects are exhibited.

(1)  気泡を含有せず、またロッドの配列乱れも生
じない長尺の一体型イメージガイドが得られる。
(1) A long integrated image guide that does not contain air bubbles and does not cause disordered arrangement of rods can be obtained.

このため、伝送される画像の質向上が図られる。Therefore, the quality of the transmitted image can be improved.

(2)製造歩留りが向上し、イメージガイドの低コスト
化が達成される。
(2) Manufacturing yield is improved and cost reduction of the image guide is achieved.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例に係るイメージガイドの製造
工程図、第2図は5i02ガラスへの各種ドーパントの
添加量と軟化点の関係を示す特性図、第3図及び第4図
は画素ロッドの加熱−体化を説明するための断面図、第
5図はSiO2ガラスへの各種ドーパントの添加量と屈
折率の関係を示す特性図、第6図は他の実施例における
画素ロッドの断面図、第7図ないし第10図はそれぞれ
他の実施例における画素ロッドの屈折率分布図、第11
図ないし第14図はそれぞれ他の実施例における画素ロ
ッドの内側クラッドと外側クラッドの多径の適正な関係
を示すための説明図、第15図(a)及び(b)は従来
技術の問題点を示す説明図である。 図中、1は配列管、2はコア部、3はクラッド部、4は
画素ロッドである。
Fig. 1 is a manufacturing process diagram of an image guide according to an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between the amount of various dopants added to 5i02 glass and its softening point, and Figs. 3 and 4 are A cross-sectional view for explaining the heating and conversion of the pixel rod, FIG. 5 is a characteristic diagram showing the relationship between the amount of dopants added to SiO2 glass and the refractive index, and FIG. The sectional views and FIGS. 7 to 10 are refractive index distribution diagrams of pixel rods in other embodiments, respectively.
14 through 14 are explanatory diagrams showing the appropriate relationship between the diameters of the inner cladding and the outer cladding of the pixel rod in other embodiments, and FIGS. 15(a) and 15(b) show the problems of the prior art. FIG. In the figure, 1 is an array tube, 2 is a core portion, 3 is a cladding portion, and 4 is a pixel rod.

Claims (1)

【特許請求の範囲】 (1)コア部と該コア部の外周部にこれを囲繞するよう
に設けられたクラッド部とからなる複数の画素ロッドを
集束して配列管内に挿入し、これらを加熱一体化した後
延伸して得られるイメージガイドにおいて、上記クラッ
ド部及び上記配列管が上記コア部と等しいかあるいは上
記コア部より低い軟化点を有することを特徴とするイメ
ージガイド。 (2)上記クラッド部が上記コア部を囲繞する内側クラ
ッドと該内側クラッドを囲繞する外側クラッドとからな
り、外側クラッドがコア部及び内側クラッドのうち少な
くとも一方より低い軟化点を有していることを特徴とす
る特許請求の範囲第1項記載のイメージガイド。 (3)上記外側クラッドの半径aと上記内側クラッドの
半径bとの比a/bが、 1.05≦a/b≦1.12 の範囲内にあることを特徴とする特許請求の範囲第2項
記載のイメージガイド。 (4)上記クラッド部がその径方向外方に向かう程低い
軟化点を有していることを特徴とする特許請求の範囲第
1項記載のイメージガイド。
[Claims] (1) A plurality of pixel rods consisting of a core portion and a cladding portion provided around the outer periphery of the core portion are focused and inserted into an array tube, and heated. An image guide obtained by stretching after being integrated, wherein the clad part and the array tube have a softening point equal to or lower than the core part. (2) The cladding portion includes an inner cladding surrounding the core portion and an outer cladding surrounding the inner cladding, and the outer cladding has a softening point lower than at least one of the core portion and the inner cladding. An image guide according to claim 1, characterized in that: (3) The ratio a/b of the radius a of the outer cladding and the radius b of the inner cladding is within the range of 1.05≦a/b≦1.12. Image guide described in Section 2. (4) The image guide according to claim 1, wherein the cladding portion has a softening point that decreases as it goes radially outward.
JP61165565A 1986-07-16 1986-07-16 Image guide Pending JPS6321231A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61165565A JPS6321231A (en) 1986-07-16 1986-07-16 Image guide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61165565A JPS6321231A (en) 1986-07-16 1986-07-16 Image guide

Publications (1)

Publication Number Publication Date
JPS6321231A true JPS6321231A (en) 1988-01-28

Family

ID=15814777

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61165565A Pending JPS6321231A (en) 1986-07-16 1986-07-16 Image guide

Country Status (1)

Country Link
JP (1) JPS6321231A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02291506A (en) * 1989-05-01 1990-12-03 Fujikura Ltd Image fiber and production thereof
JPH05345632A (en) * 1992-06-17 1993-12-27 Hitachi Cable Ltd Rare earth metal element-added multi-core fiber and its production
JP2009211066A (en) * 2008-02-29 2009-09-17 Sumitomo Electric Ind Ltd Photonic bandgap optical fiber and method of manufacturing the same
WO2012069162A1 (en) * 2010-11-26 2012-05-31 Schott Ag Fiber-optic image conductor comprising multifaceted rods
JP6006894B1 (en) * 2016-02-02 2016-10-12 株式会社住田光学ガラス Image guide fiber
JP2019034865A (en) * 2017-08-14 2019-03-07 株式会社フジクラ Production method of optical fiber preform

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02291506A (en) * 1989-05-01 1990-12-03 Fujikura Ltd Image fiber and production thereof
JPH05345632A (en) * 1992-06-17 1993-12-27 Hitachi Cable Ltd Rare earth metal element-added multi-core fiber and its production
JP2009211066A (en) * 2008-02-29 2009-09-17 Sumitomo Electric Ind Ltd Photonic bandgap optical fiber and method of manufacturing the same
WO2012069162A1 (en) * 2010-11-26 2012-05-31 Schott Ag Fiber-optic image conductor comprising multifaceted rods
JP6006894B1 (en) * 2016-02-02 2016-10-12 株式会社住田光学ガラス Image guide fiber
WO2017134702A1 (en) * 2016-02-02 2017-08-10 株式会社住田光学ガラス Image guide fiber
KR20180061334A (en) * 2016-02-02 2018-06-07 가부시키가이샤 스미타코가쿠가라스 Image guide fiber
CN108139536A (en) * 2016-02-02 2018-06-08 住田光学玻璃公司 Image conducts optical fiber
US10508053B2 (en) 2016-02-02 2019-12-17 Sumita Optical Glass, Inc. Image guide fiber
JP2019034865A (en) * 2017-08-14 2019-03-07 株式会社フジクラ Production method of optical fiber preform

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