JPS649601B2 - - Google Patents
Info
- Publication number
- JPS649601B2 JPS649601B2 JP58241135A JP24113583A JPS649601B2 JP S649601 B2 JPS649601 B2 JP S649601B2 JP 58241135 A JP58241135 A JP 58241135A JP 24113583 A JP24113583 A JP 24113583A JP S649601 B2 JPS649601 B2 JP S649601B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- fiber bundle
- core
- light
- soluble 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
- G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【発明の詳細な説明】
本発明は、光学繊維束特に画像伝送用光学繊維
束に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical fiber bundle, particularly an optical fiber bundle for image transmission.
画像伝送用光学繊維束の製造方法の一つに所謂
酸溶出法がある。 One of the methods for manufacturing optical fiber bundles for image transmission is the so-called acid elution method.
この酸溶出法は、第１図に示すような比較的屈
折率の高い硝材１を芯にして、その周囲に比較的
屈折率の低い硝材２を被覆し、更にその外周に塩
酸等の酸に可溶な硝材３を被覆した直径が200〜
500μｍの単繊維４を、適当な長さ（通常は200〜
300mm）に切断し、かかる単繊維４を第２図に示
す如く酸に可溶な硝子管５の中に多数配列して電
気炉７によつて熱を加え、適当な細さになるまで
延伸して融着繊維束６を作り、更に、該融着繊維
束６を適当な長さに切断して、その両端部分を耐
酸性の物質で被覆し、１〜２規定の塩酸溶液に浸
して中間部分の可溶性硝子を溶出させて第３図に
示すような可撓性光学繊維束８を得るものであ
る。 In this acid elution method, a glass material 1 with a relatively high refractive index as shown in Fig. 1 is used as a core, a glass material 2 with a relatively low refractive index is coated around the core, and the outer periphery is further coated with an acid such as hydrochloric acid. The diameter covered with soluble glass material 3 is 200~
A single fiber 4 of 500μm is cut into an appropriate length (usually 200~
300 mm), such single fibers 4 are arranged in large numbers in an acid-soluble glass tube 5 as shown in FIG. Then, the fused fiber bundle 6 is cut into an appropriate length, both ends of which are coated with an acid-resistant material, and immersed in a 1 to 2 N hydrochloric acid solution. The soluble glass in the middle portion is eluted to obtain a flexible optical fiber bundle 8 as shown in FIG.
このようにして得られた光学繊維束８は、耐酸
性の物質の被覆が取り除かれ、各繊維が一体に固
定された端部９，９′と可溶性硝子が溶出し各繊
維が分離して可撓性を持つた部分１０とから成
り、上記光学繊維束８の端部９，９′は、第４図
の断面図で示す如く、光を伝送する高屈折率のコ
ア部１１と、該コア部１１内を伝送される光を全
反射させるために該コア部１１を被覆する低屈折
率のグラツド部１２と、該グラツド部１２を被覆
する可溶性ガラス１３とで構成された単光学繊維
が多数束ねられた状態となつている。 The optical fiber bundle 8 obtained in this way has the acid-resistant material coating removed, and the ends 9 and 9' where each fiber is fixed together, and the soluble glass eluted and the fibers are separated and made into a plastic. The end portions 9, 9' of the optical fiber bundle 8 include a core portion 11 having a high refractive index for transmitting light, and a core portion 11 having a high refractive index for transmitting light, and a core portion 11 having a high refractive index for transmitting light, and A large number of single optical fibers are made up of a low refractive index glad part 12 that covers the core part 11 and a soluble glass 13 that covers the glad part 12 in order to totally reflect the light transmitted through the core part 11. It is in a bundled state.
一般に、内視鏡等に用いられる光学繊維束にお
いては、上記可溶性ガラス１３の厚さは、0.5〜
1μ、グラツド部１２の厚さは１〜2μ、コア部１
１の径は７〜10μ程度なので、実際に光を伝送す
る部分であるコア部１１の面積は総断面積の40〜
50％程度である。 Generally, in optical fiber bundles used for endoscopes, etc., the thickness of the soluble glass 13 is 0.5~
1μ, the thickness of the glad part 12 is 1~2μ, the thickness of the core part 1
1 has a diameter of about 7 to 10μ, so the area of the core portion 11, which is the part that actually transmits light, is about 40 to 10μ of the total cross-sectional area.
It is about 50%.
また、解像力を向上させる目的で光学繊維径を
細めても可溶性ガラス１３の厚さは0.5〜1μ以下
に薄くすることはできず、グラツド部１２の厚さ
も光学的には１〜2μは必要となり、結局、コア
部１１の径のみを細くしなければならず、ますま
すコア部１１の面積の比率は減少し、全体として
暗い光学繊維束となつてしまう。 Furthermore, even if the diameter of the optical fiber is reduced in order to improve resolution, the thickness of the soluble glass 13 cannot be reduced to less than 0.5 to 1 μm, and the thickness of the glad portion 12 must be optically 1 to 2 μm. In the end, only the diameter of the core part 11 has to be made thinner, and the area ratio of the core part 11 is further reduced, resulting in a dark optical fiber bundle as a whole.
本発明は、かかる問題点に鑑みてなされたもの
であり、総断面積に対してコア部面積の比率の大
きい明るい光学繊維束を提供せんとするものであ
る。 The present invention has been made in view of this problem, and aims to provide a bright optical fiber bundle in which the ratio of the core area to the total cross-sectional area is large.
以下、図面を用いて従来例と比較しながら本発
明に係る光学繊維束を説明する。 Hereinafter, the optical fiber bundle according to the present invention will be explained using the drawings and comparing it with a conventional example.
第５図は本発明に係る光学繊維束を実現するた
めの素材としての２重構造の単繊維１６であり、
該単繊維１６は、コア部１４と該コア部１４の外
周に被覆されたガラス部１５とから成り、コア部
１４はPbO、SiO2を主成分とする屈折率が1.6近
辺のガラス、ガラス部１５はB2O3、BaOを主成
分とする屈折率が1.5近辺の酸可溶性ガラスで形
成されている。 FIG. 5 shows a double-structured single fiber 16 as a material for realizing the optical fiber bundle according to the present invention.
The single fiber 16 consists of a core part 14 and a glass part 15 coated on the outer periphery of the core part 14. Reference numeral 15 is made of acid-soluble glass containing B 2 O 3 and BaO as main components and having a refractive index of around 1.5.
この二重構造の単繊維１６を前述した第２図の
方法と全く同様に酸に可溶なガラス管の中に充填
し、電気炉により加熱延伸して融着光学繊維束を
作り、それを適当な長さに切断して両端部を耐酸
性の物質で被覆し、酸処理することにより外見上
は第３図と同様な可撓性光学繊維束１９が得られ
る。各繊維が一体に固定された端部は第６図に示
す如く、コア部１７と可溶性ガラス１８よりなつ
ている。 This double-structured single fiber 16 is filled into an acid-soluble glass tube in exactly the same manner as in the method shown in FIG. By cutting it to an appropriate length, coating both ends with an acid-resistant material, and treating it with an acid, a flexible optical fiber bundle 19 having an appearance similar to that shown in FIG. 3 can be obtained. The end portion where each fiber is fixed integrally consists of a core portion 17 and a soluble glass 18, as shown in FIG.
従来の可撓性光学繊維束にあつては、第３図に
示す如く、可撓性を有する部分１０の各光学繊維
は、コア部１１とグラツド部１２の二重構造とな
つており、高屈折率ガラスよりなるコア部１１内
を伝送される光は、低屈折率ガラスよりなるグラ
ツド部１２で全反射され外部に漏れることなく入
射端面から出射端面へと光は伝送される。 In the conventional flexible optical fiber bundle, each optical fiber in the flexible portion 10 has a double structure of a core portion 11 and a glad portion 12, as shown in FIG. The light transmitted within the core part 11 made of refractive index glass is totally reflected by the glad part 12 made of low refractive index glass, and the light is transmitted from the input end face to the output end face without leaking to the outside.
しかしながら、本発明に係る二重構造の単繊維
１６を素材として製造された上記可撓性光学繊維
束１９においては、その可撓性を有する部分の各
光学繊維は、コア部１７のみで構成されているの
で、一方から入射された光はコア部１７より成る
各光学繊維が接触している箇所で互いに光が混合
して全体に一様な光となつて他端より出射される
ため画像伝送用にはまだ不適当なものである。 However, in the flexible optical fiber bundle 19 manufactured using the double-structured single fiber 16 according to the present invention, each optical fiber in the flexible portion is composed of only the core portion 17. Therefore, the light incident from one end mixes with each other at the points where the optical fibers made of the core part 17 are in contact, becomes uniform light as a whole, and is emitted from the other end, which facilitates image transmission. It is still unsuitable for use.
そこで本発明では第７図に示す如く、前記可撓
性光学繊維束１９を光硬化型接着剤２０（例え
ば、米国、オプテイカル・フアイバー・テクノロ
ジー社製 OFTI−VLCA、400〜500mmの可視光
で硬化、屈折率：1.507）の中に一端より徐々に
浸漬させると同時に、硬化に適した光を光源２１
よりレンズ２２を通してもう一方の端部より光学
繊維束１９の中に入射させ、可撓性を有している
部分のコア部のみより成る光学繊維の外周を接着
剤２０で被覆しようとするものである。その時の
接着剤２０の液内におけるコア部１７のみで構成
された光学繊維２３内を伝送される光の進路を第
８図に示す。大気中においては光学繊維２３の側
面において全反射され伝送されていた光線２５
（光学繊維側面となす角度の最大で約39゜）は屈折
率1.5の接着剤２０の中では外部に漏れる。屈折
率1.5の接着剤２０の中で全反射される光線２４
の光学繊維２３の側面となす最大の角度は約20゜
であり、光線２５と光線２４の間にある光線２６
のような光は全て接着剤２０の液面近辺で接着剤
中に漏れ出る結果となる。その液面近辺で光の漏
れ出る巾は光学繊維２３の外径を10μとすると約
30μ位いとなる。又、液面下30μ以下になると光
学繊維２３内を伝送する光は全て光学繊維側面と
なす角が20゜以下の光線２７ばかりとなり、外部
に漏れ出るようなことはない。 Therefore, in the present invention, as shown in FIG. 7, the flexible optical fiber bundle 19 is cured with a photocurable adhesive 20 (for example, OFTI-VLCA manufactured by Optical Fiber Technology, Inc., USA, with visible light of 400 to 500 mm). , refractive index: 1.507) from one end, and at the same time, the light source 21 emits light suitable for curing.
The optical fiber bundle 19 is made to enter the optical fiber bundle 19 from the other end through the lens 22, and the outer periphery of the optical fiber consisting only of the flexible core portion is coated with the adhesive 20. be. FIG. 8 shows the path of light transmitted through the optical fiber 23, which is composed only of the core portion 17, within the adhesive 20 at that time. In the atmosphere, the light rays 25 are totally reflected and transmitted on the side surfaces of the optical fibers 23.
(The maximum angle with the side surface of the optical fiber is about 39 degrees) leaks to the outside in the adhesive 20 with a refractive index of 1.5. A light ray 24 that is totally reflected in the adhesive 20 with a refractive index of 1.5
The maximum angle between the optical fiber 23 and the side surface of the optical fiber 23 is about 20°, and the ray 26 between the ray 25 and the ray 24
All such light leaks into the adhesive near the liquid surface of the adhesive 20. If the outer diameter of the optical fiber 23 is 10μ, the width of light leaking near the liquid surface is approximately
It will be about 30μ. Furthermore, when the liquid surface is below 30 μm, all of the light transmitted within the optical fiber 23 becomes the light ray 27 whose angle with the side surface of the optical fiber is 20° or less, and there is no leakage to the outside.
つまり液面下30μ位いの部分でのみ接着剤２０
の硬化が進行することになる。 In other words, adhesive 20 is applied only in the part about 30μ below the liquid surface.
hardening will proceed.
以上説明したように第７図のような方法でもつ
て光学繊維束１９を光硬化型の接着剤２０の中に
入れる速度をコントロールすることにより所定の
厚さの硬化層をコア部のみよりなる光学繊維の外
周に形成させることが可能となる。 As explained above, by controlling the speed at which the optical fiber bundle 19 is introduced into the photocurable adhesive 20 using the method shown in FIG. It becomes possible to form it around the outer periphery of the fiber.
又、未硬化の接着剤はメチレン・クロライド、
アセトン等の溶剤にて洗浄することにより容易に
除去することが可能であるため、第７図で説明し
た工程を経た光学繊維束１９を上記溶剤にて洗浄
すれば中間では各光学繊維が分離され、かつ屈折
率が1.6のコア部の外周に屈折率1.5の硬化した接
着層のある二重構造のものとなつた可撓性光学繊
維束を得ることができる。このような構造におい
ては前述した各光学繊維が接触することによる光
の混合は起らず、又、本発明に係る可撓性光学繊
維束の固定部も第６図に示す如くコア部１７は低
屈折率の可溶性ガラス１８で被覆されているの
で、ここでも光の混合は起らず、画像伝送に適し
た光学繊維束となる。 In addition, the uncured adhesive is methylene chloride,
It can be easily removed by cleaning with a solvent such as acetone, so if the optical fiber bundle 19 that has gone through the process explained in FIG. 7 is cleaned with the above solvent, each optical fiber will be separated in the middle. , and a flexible optical fiber bundle having a double structure including a core portion having a refractive index of 1.6 and a hardened adhesive layer having a refractive index of 1.5 on the outer periphery of the core portion can be obtained. In such a structure, mixing of light due to the above-mentioned optical fibers coming into contact does not occur, and the fixing part of the flexible optical fiber bundle according to the present invention also has a core part 17 as shown in FIG. Since it is coated with soluble glass 18 having a low refractive index, light mixing does not occur here as well, resulting in an optical fiber bundle suitable for image transmission.
以上のことから、従来の可撓性光学繊維束の固
定部においては、第４図のグラツド部１２と可溶
性ガラス１３の厚さを夫々1μとして、コア部１
１の径を6μとするとコア部の面積は総断面積の
36％にしかならないが、本発明に係る可撓性光学
繊維束の固定部においては第６図の可溶性ガラス
１８の厚さを1μとし、第４図とピツチを同じく
するとコア部１７は8μとなりその面積比率は64
％にもなり、従来のものと比較してコア部１７が
約２倍となり非常に明るい光学繊維束となる。 From the above, in the fixing part of the conventional flexible optical fiber bundle, the thickness of the glad part 12 and the soluble glass 13 in FIG.
If the diameter of 1 is 6μ, the area of the core is the total cross-sectional area.
However, in the fixed part of the flexible optical fiber bundle according to the present invention, if the thickness of the soluble glass 18 in Fig. 6 is 1μ and the pitch is the same as in Fig. 4, the core part 17 will be 8μ. Its area ratio is 64
%, and the core portion 17 is about twice that of the conventional one, resulting in a very bright optical fiber bundle.
このように本発明によれば、従来のものに比較
して非常に明るい画像伝送用光学繊維束を得るこ
とができるものであり、かかる光学繊維束を内視
鏡等に使用すれば、極めて見易い観察光学系とな
るなどその応用範囲は極めて大きいものである。 As described above, according to the present invention, it is possible to obtain an optical fiber bundle for image transmission that is extremely bright compared to conventional ones, and when such an optical fiber bundle is used in an endoscope, etc., it is extremely easy to see. Its application range is extremely wide, including observation optical systems.
第１図は従来の光学繊維束の素材となる単繊維
の斜視図、第２図は光学繊維束の製法の一過程を
示す説明図、第３図は従来の光学繊維束の正面
図、第４図は従来の光学繊維束の固定部の拡大断
面図、第５図は本発明に係る光学繊維束の素材と
なる単繊維の斜視図、第６図は本発明に係る光学
繊維束の固定部の拡大断面図、第７図は本発明に
係る光学繊維束の製法の一過程を示す説明図、第
８図は本発明に係る光学繊維内の光の進路の説明
図である。
１４，１７……コア部、１５，１８……可溶性
ガラス部、１６……単繊維、２０……光硬化型接
着剤。
Fig. 1 is a perspective view of a single fiber that is the raw material for a conventional optical fiber bundle, Fig. 2 is an explanatory diagram showing a process of manufacturing an optical fiber bundle, and Fig. 3 is a front view of a conventional optical fiber bundle. FIG. 4 is an enlarged sectional view of a fixing part of a conventional optical fiber bundle, FIG. 5 is a perspective view of a single fiber that is the material of the optical fiber bundle according to the present invention, and FIG. 6 is a fixation of the optical fiber bundle according to the present invention. FIG. 7 is an explanatory diagram showing a process of manufacturing an optical fiber bundle according to the present invention, and FIG. 8 is an explanatory diagram of the course of light within the optical fiber according to the present invention. 14, 17... Core part, 15, 18... Soluble glass part, 16... Single fiber, 20... Photo-curable adhesive.
Claims (1)
から成り、該固定部においては、コア部と該コア
部を被覆する可溶性ガラスとで構成された光学繊
維が束ねられ、中間の可撓性を有する部分におい
ては、上記可溶性ガラスが酸処理されて溶出除去
され、更にコア部の外周を光硬化性樹脂で被覆
し、各光学繊維が屈曲自在に分離されていること
を特徴とする光学繊維束。1 Consists of fixed parts at both ends and a flexible part in the middle, in which optical fibers made of a core part and soluble glass covering the core part are bundled, and in the fixed part in the middle flexible part In the optical fiber part, the soluble glass is treated with an acid to be eluted and removed, and the outer periphery of the core part is further coated with a photocurable resin, and each optical fiber is separated in a bendable manner. fiber bundle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58241135A JPS60131505A (en) | 1983-12-20 | 1983-12-20 | Optical fiber bundle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58241135A JPS60131505A (en) | 1983-12-20 | 1983-12-20 | Optical fiber bundle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60131505A JPS60131505A (en) | 1985-07-13 |
| JPS649601B2 true JPS649601B2 (en) | 1989-02-17 |
Family
ID=17069795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58241135A Granted JPS60131505A (en) | 1983-12-20 | 1983-12-20 | Optical fiber bundle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60131505A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10057130B4 (en) * | 2000-11-16 | 2006-04-13 | Schott Ag | Method of moving a plurality of fiber ends to a predetermined position |
| DE10240508A1 (en) * | 2002-09-03 | 2004-03-11 | Schott Glas | Etched or leached optic fiber bundle is produced from a number of fiber and spacer preforms with gaps formed between them to be filled with an adhesive and subsequent removal of the spacers |
| DE102008044938B4 (en) * | 2008-08-29 | 2013-10-10 | Schott Ag | Method for terminating light-conducting fiber bundles and sleeve with a fiber bundle |
-
1983
- 1983-12-20 JP JP58241135A patent/JPS60131505A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60131505A (en) | 1985-07-13 |
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