JP3723566B2 - Ferrule with optical fiber - Google Patents

Ferrule with optical fiber Download PDF

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JP3723566B2
JP3723566B2 JP2004252495A JP2004252495A JP3723566B2 JP 3723566 B2 JP3723566 B2 JP 3723566B2 JP 2004252495 A JP2004252495 A JP 2004252495A JP 2004252495 A JP2004252495 A JP 2004252495A JP 3723566 B2 JP3723566 B2 JP 3723566B2
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optical fiber
insertion hole
ferrule
hole
strand
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JP2005189805A (en
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大輔 早坂
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Yonezawa Electric Wire Co Ltd
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Description

本発明は、光ファイバ付きフェルールに関する。   The present invention relates to a ferrule with an optical fiber.

従来、光ファイバを光接続する方法の一つとして光コネクタが用いられている。一般に光コネクタは、フェルール内に光ファイバ心線の先端部の樹脂被覆を除去して該先端部に露出された裸光ファイバをフェルールの光ファイバ挿入穴に固定することにより、光ファイバを互いに位置決めして接続できるような状態になされる（例えば特許文献１参照）。
図５，図６は、従来の光ファイバ付きフェルール１１０の一例を示す縦断面図である。これらの光ファイバ付きフェルール１１０は、光ファイバ心線１０３の先端部に露出された裸光ファイバ１０１をフェルール１１１の光ファイバ挿入穴１１４内に挿入して接着剤の充填により固定したものである。
光ファイバ心線１０３は、裸光ファイバ１０１の外周に樹脂被覆１０５が設けられたものである。
フェルール１１１は、フランジ１１３ａを有するフェルール本体１１３の先端側にジルコニア等からなるキャピラリー１１２が固定されたものである。キャピラリー１１２は、接合端面１１２ａと、該接合端面１１２ａに開口されて裸光ファイバ１０１が挿入及び位置決めされる光ファイバ挿入穴１１４を有する。また、フェルール本体１１３には、光ファイバ心線１０３が挿入及び収納される心線挿入穴１１６が形成されている。
図５のフェルール１１１では、心線挿入穴１１６はフェルール本体１１３の範囲に設けられており、図６のフェルール１１１では、心線挿入穴１１６はフェルール本体１１３からキャピラリー１１２の後端側までの範囲に設けられている。心線挿入穴１１６は光ファイバ挿入穴１１４よりも大径であり、光ファイバ挿入穴１１４と心線挿入穴１１６との間には両者を連通するテーパ穴１１５が形成されている。 Conventionally, an optical connector has been used as one method for optically connecting optical fibers. In general, an optical connector positions a pair of optical fibers by removing the resin coating at the tip of the optical fiber core in the ferrule and fixing the bare optical fiber exposed at the tip to the optical fiber insertion hole of the ferrule. (See, for example, Patent Document 1).
5 and 6 are longitudinal sectional views showing an example of a conventional ferrule 110 with an optical fiber. These ferrules with optical fibers 110 are obtained by inserting the bare optical fiber 101 exposed at the tip of the optical fiber core wire 103 into the optical fiber insertion hole 114 of the ferrule 111 and fixing it by filling with an adhesive.
The optical fiber core 103 is obtained by providing a resin coating 105 on the outer periphery of the bare optical fiber 101.
In the ferrule 111, a capillary 112 made of zirconia or the like is fixed to the tip side of a ferrule body 113 having a flange 113a. The capillary 112 has a joining end face 112a and an optical fiber insertion hole 114 that is opened in the joining end face 112a and into which the bare optical fiber 101 is inserted and positioned. Further, the ferrule body 113 is formed with a core wire insertion hole 116 into which the optical fiber core wire 103 is inserted and stored.
In the ferrule 111 of FIG. 5 , the core wire insertion hole 116 is provided in the range of the ferrule body 113. In the ferrule 111 of FIG. 6 , the core wire insertion hole 116 is a range from the ferrule body 113 to the rear end side of the capillary 112. Is provided. The core wire insertion hole 116 has a larger diameter than the optical fiber insertion hole 114, and a tapered hole 115 is formed between the optical fiber insertion hole 114 and the core wire insertion hole 116 so as to communicate both.

特許文献２の図１には、フェルール内部が３段階（大径孔部、中径孔部、小径孔部）に細くなっており、それぞれが、光コード、補強材露出部分（光ファイバ素線）、裸光ファイバに対応したフェルールが記載されている。
特許文献３の図２には、内面に光ファイバ心線が接着固定された金属製スリーブにおいて、金属製スリーブの内面は径が３段階になっており、それぞれ心線、素線、裸光ファイバに対応したものが記載されている。
特許文献４の図２〜４には、中心孔が保持孔部とガイド孔部に分かれており、径が３段階になっているフェルール（硬石ブッシュ）が記載されている。ここで、保持孔部（光ファイバ挿入穴）は、裸光ファイバが挿通できる範囲でその内径が光ファイバの外径と等しくなるように仕上げられている。これに対して、ガイド孔部は、プライマコートを取り除かない状態での光ファイバ（すなわち光ファイバ素線）が十分通過しうる程度の大きい内径を有する。
特開２０００−１４７３２０号公報 実開昭６４−６６０９号公報 実開昭５９−９５３１０号公報 実開昭５６−１３９１１２号公報 In FIG. 1 of Patent Document 2, the inside of the ferrule is thinned into three stages (large diameter hole part, medium diameter hole part, and small diameter hole part). ), A ferrule corresponding to a bare optical fiber is described.
FIG. 2 of Patent Document 3 shows a metal sleeve in which an optical fiber core wire is bonded and fixed to the inner surface. The inner surface of the metal sleeve has three stages in diameter, and each of the core wire, the strand, and the bare optical fiber. The thing corresponding to is described.
2 to 4 of Patent Document 4 describe a ferrule (hard stone bush) in which the center hole is divided into a holding hole portion and a guide hole portion, and the diameter is in three stages. Here, the holding hole portion (optical fiber insertion hole) is finished so that the inner diameter thereof is equal to the outer diameter of the optical fiber as long as the bare optical fiber can be inserted. On the other hand, the guide hole portion has a large inner diameter that allows an optical fiber (that is, an optical fiber strand) without passing through the primer coat to pass sufficiently.
JP 2000-147320 A Japanese Utility Model Publication No. 64-6609 Japanese Utility Model Publication No.59-95310 Japanese Utility Model Publication No. 56-139112

しかしながら、図５，図６に図示したようなフェルール１１１に光ファイバ心線１０３の先端部を挿入固定した場合には、テーパ穴１１５において心線挿入穴１１６と光ファイバ挿入穴１１４との内径の縮小比が大きいことから、図７に示すように、テーパ穴１１５内にかなりの量の接着剤Ａｄが溜まることになる。この結果、接着剤Ａｄの硬化時または温度変化による収縮あるいは気泡の混入によりテーパ穴１１５内に近接した光ファイバ挿入穴１１４内の裸光ファイバ１０１にかなりのストレスが加わり、光ファイバの特性が劣化してしまう。また、光ファイバ心線１０３の外径は例えば約０．９ｍｍであり、その外周に対する心線挿入穴１１６の位置決め精度を高くしにくいことから、光ファイバ心線１０３の外周と心線挿入穴１１６の内面との間にはある程度の隙間（例えば内外径の差にして約０．１ｍｍまたはそれ以上）があることが通常であり、図８（ａ）に示すように光ファイバをフェルール内に挿入するときに、光ファイバ心線１０３の中心線が心線挿入穴１１６の中心線からずれることがあり、樹脂被覆１０５と心線挿入穴１１６の内面との摩擦等により光ファイバ心線１０３が曲がって不均等な状態になったり、図８（ｂ）に示すように樹脂被覆１０５の端部が斜めに偏った状態でテーパ穴１１５に突き当たることによって樹脂被覆１０５にストレスが加わったりする場合があり、その結果、裸光ファイバ１０１が屈曲するなどして光ファイバの特性がさらに劣化するおそれがある。なお、図８においては、光ファイバと穴の内面との間に接着剤の図示を省略している。
このように、光ファイバ心線の被覆の端部がテーパ穴の内面に突き当たった場合でも、逆に、前記被覆の端部とテーパ穴の内面との間に隙間を設けてその隙間を接着剤で埋めた場合でも、テーパ穴の内面からの突き当たり力あるいは接着剤の収縮等により、裸光ファイバに不均等な外力が加わるおそれがあり、特性の優れた光ファイバ付きフェルールを組み立てることは困難であった。 However, when the distal end portion of the optical fiber core wire 103 is inserted and fixed to the ferrule 111 as shown in FIGS. 5 and 6 , the inner diameters of the core wire insertion hole 116 and the optical fiber insertion hole 114 in the tapered hole 115 are the same. Since the reduction ratio is large, a considerable amount of the adhesive Ad is accumulated in the tapered hole 115 as shown in FIG . As a result, considerable stress is applied to the bare optical fiber 101 in the optical fiber insertion hole 114 close to the tapered hole 115 due to shrinkage of the adhesive Ad or due to temperature change or mixing of bubbles, and the characteristics of the optical fiber deteriorate. Resulting in. Further, the outer diameter of the optical fiber core wire 103 is, for example, about 0.9 mm, and it is difficult to increase the positioning accuracy of the core wire insertion hole 116 with respect to the outer periphery thereof. Usually, there is a certain gap (for example, about 0.1 mm or more in the difference between the inner and outer diameters) between the inner surface and the optical fiber is inserted into the ferrule as shown in FIG. In this case, the center line of the optical fiber core wire 103 may deviate from the center line of the core wire insertion hole 116, and the optical fiber core wire 103 is bent due to friction between the resin coating 105 and the inner surface of the core wire insertion hole 116. or become uneven state Te, or applied stress in the resin coating 105 by impinging the tapered hole 115 in a state where the end portion of the resin coating 105 is biased obliquely as shown in FIG. 8 (b) That if there are, as a result, there is a risk that the bare optical fiber 101 is further deteriorated the characteristics of the optical fiber, such as by bending. In FIG. 8 , the adhesive is not shown between the optical fiber and the inner surface of the hole.
Thus, even when the end portion of the coating of the optical fiber core wire hits the inner surface of the taper hole, conversely, a gap is provided between the end portion of the coating and the inner surface of the taper hole, and the gap is bonded to the adhesive. Even if it is filled with, it is difficult to assemble a ferrule with an optical fiber with excellent characteristics due to the contact force from the inner surface of the taper hole or shrinkage of the adhesive, which may cause an uneven external force to be applied to the bare optical fiber. there were.

また、特許文献２〜４に記載されているように、光ファイバが挿入される内部穴が３段階になっているフェルールであっても、裸光ファイバの直後に光ファイバ素線の被覆が残っていること以外の事情は同様であり、光ファイバ素線の被覆の端部がテーパ穴の内面に突き当たった場合でも、逆に、前記被覆の端部とテーパ穴の内面との間に隙間を設けてその隙間を接着剤で埋めた場合でも、テーパ穴の内面からの突き当たり力あるいは接着剤の収縮等により、裸光ファイバに不均等な外力が加わるおそれがあり、特性の優れた光ファイバ付きフェルールを組み立てることは困難であった。   Further, as described in Patent Documents 2 to 4, even in a ferrule in which the inner hole into which the optical fiber is inserted has three stages, the coating of the optical fiber is left immediately after the bare optical fiber. The situation is the same except that the end of the coating of the optical fiber strand hits the inner surface of the tapered hole, conversely, a gap is formed between the end of the coating and the inner surface of the tapered hole. Even if the gap is provided and filled with adhesive, there is a risk that non-uniform external force may be applied to the bare optical fiber due to the contact force from the inner surface of the taper hole or the shrinkage of the adhesive. It was difficult to assemble a ferrule.

本発明は、上記事情に鑑みてなされたものであり、光ファイバ心線の先端部にフェルールを取り付けたときに特性の劣化を抑制できる光ファイバ付きフェルールを提供することを課題とする。   This invention is made | formed in view of the said situation, and makes it a subject to provide the ferrule with an optical fiber which can suppress deterioration of a characteristic, when a ferrule is attached to the front-end | tip part of an optical fiber core wire.

前記課題を解決するため、請求項１に記載の発明は、裸光ファイバの外周に一次被覆を設けてなる光ファイバ素線の外周に二次被覆が設けられた光ファイバ心線の先端にフェルールを取り付け、前記フェルールに挿入された光ファイバをフェルール内に接着剤で接着してなる光ファイバ付きフェルールであって、フェルールは、フェルール本体とその先端側に固定されたキャピラリーとを備え、前記キャピラリーは、接合端面に開口されて裸光ファイバが挿入及び位置決めされる光ファイバ挿入穴と、該光ファイバ挿入穴の前記接合端面と反対側の後端側に連通するとともに光ファイバ素線が挿入及び位置決めされる素線挿入穴とを有しており、前記フェルール本体は、前記素線挿入穴の前記光ファイバ挿入穴と反対側の後端側に連通するとともに光ファイバ心線が挿入及び収納される心線挿入穴とを有しており、前記光ファイバ挿入穴と前記素線挿入穴との間の第１のテーパ穴および前記素線挿入穴と心線挿入穴との間の第２のテーパ穴が前記キャピラリーに形成されており、前記第１のテーパ穴のテーパ角が１５〜９０°の範囲内、前記第２のテーパ穴のテーパ角が６０〜９０°の範囲内であり、前記光ファイバ素線の一次被覆の端部が前記第１のテーパ穴に突き当てられ、一次被覆の端部の周縁が第１のテーパ穴の内面への突き当てにより内向きにつぶされているとともに、前記光ファイバ心線の二次被覆の端部が前記第２のテーパ穴に突き当てられ、二次被覆の端部の周縁が第２のテーパ穴の内面への突き当てにより内向きにつぶされていることを特徴とする光ファイバ付きフェルールである。 In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a ferrule at the tip of an optical fiber core wire in which a secondary coating is provided on the outer periphery of an optical fiber obtained by providing a primary coating on the outer periphery of a bare optical fiber. And a ferrule with an optical fiber formed by adhering an optical fiber inserted into the ferrule with an adhesive into the ferrule, the ferrule comprising a ferrule body and a capillary fixed to the tip side thereof, the capillary Is communicated with an optical fiber insertion hole which is opened at the joining end face and a bare optical fiber is inserted and positioned, and a rear end side opposite to the joining end face of the optical fiber insertion hole, and an optical fiber strand is inserted and A wire insertion hole to be positioned, and the ferrule body communicates with a rear end side of the wire insertion hole opposite to the optical fiber insertion hole. A first core hole between the optical fiber insertion hole and the strand insertion hole, and a strand insertion hole. A second taper hole is formed in the capillary between the core wire insertion hole, the taper angle of the first taper hole is within a range of 15 to 90 °, and the taper angle of the second taper hole is in the range of 60 to 90 °, the primary coating of the optical fiber end portion is abutted against the first tapered hole, the peripheral edge of the end portion of the primary coating to the inner surface of the first tapered hole together they are collapsed inwardly by abutting the ends of the secondary coating of the optical fiber is butted to the second tapered bore, the peripheral edge of the end portion of the second coating the second tapered hole with an optical fiber, characterized by being crushed inwardly by the abutment of the inner surface A ferrule.

本発明によれば、フェルール内の光ファイバ挿入穴と心線挿入穴との間に設けられた素線挿入穴によって光ファイバ素線を位置決め固定することができることから光ファイバ心線の曲がりや二次被覆のストレス等が光ファイバ挿入穴内の裸光ファイバに影響を与えにくくなる。また、光ファイバ挿入穴と素線挿入穴との間の縮小比がより小さくなることから、接着剤の収縮や気泡による影響も生じにくい。このため、光ファイバの特性劣化が少なく、特性の優れた光ファイバ付きフェルールを得ることができる。
光ファイバ素線の外周面が素線挿入穴の内面にほぼ密着しているので、光ファイバ素線の中心線が素線挿入穴の中心線からずれることがなく、光ファイバ素線が素線挿入穴の内面によって位置決めされ、光ファイバ素線を素線挿入穴に真っ直ぐ挿入することができる。さらに、光ファイバ素線の一次被覆の端部が、光ファイバ挿入穴と素線挿入穴との間の中間部に突き当たったときに、一次被覆の端部が該中間部の内面に対して真っ直ぐに突き当たるので、一次被覆や裸光ファイバにストレスが加わることがなく、光ファイバ素線は、素線挿入穴によって位置決めされた状態に保持される。隙間に充填された接着剤の硬化や温度変化のために、接着剤の収縮が起こった場合でも、素線挿入穴によって光ファイバ素線が周囲から均等に保持されているので、裸光ファイバの内部応力や曲げ変形など光伝送に不都合となる要因が抑制され、光特性が確実に維持される。一次被覆の端部と前記中間部の内面との間に溜まる接着剤の量も少なくなるので、接着剤に生じる内部応力も小さくなり、光ファイバへの悪影響が一層抑制される。 According to the present invention, bending or second optical fiber since it is possible for positioning and fixing the optical fiber by the strand insertion hole provided between the optical fiber insertion hole and the core wire insertion hole of the ferrule The stress of the next coating hardly affects the bare optical fiber in the optical fiber insertion hole. In addition, since the reduction ratio between the optical fiber insertion hole and the strand insertion hole becomes smaller, the adhesive shrinkage and the influence of bubbles are less likely to occur. For this reason, there is little characteristic deterioration of an optical fiber, and the ferrule with an optical fiber excellent in the characteristic can be obtained.
Since the outer peripheral surface of the optical fiber strand is in close contact with the inner surface of the strand insertion hole, the center line of the optical fiber strand does not deviate from the center line of the strand insertion hole, and the optical fiber strand Positioned by the inner surface of the insertion hole, the optical fiber strand can be inserted straight into the strand insertion hole. Further, when the end portion of the primary coating of the optical fiber strand hits the intermediate portion between the optical fiber insertion hole and the strand insertion hole, the end portion of the primary coating is straight with respect to the inner surface of the intermediate portion. Therefore, no stress is applied to the primary coating or the bare optical fiber, and the optical fiber strand is held in a state of being positioned by the strand insertion hole. Even when the adhesive shrinks due to hardening of the adhesive filled in the gap or temperature change, the optical fiber strands are held uniformly from the surroundings by the strand insertion holes, so that the bare optical fiber Factors that are inconvenient for optical transmission such as internal stress and bending deformation are suppressed, and optical characteristics are reliably maintained. Since the amount of the adhesive that accumulates between the end portion of the primary coating and the inner surface of the intermediate portion is also reduced, the internal stress generated in the adhesive is also reduced, and the adverse effect on the optical fiber is further suppressed.

以下、最良の形態に基づき、図面を参照して本発明を説明する。
図１は、本発明の光ファイバ付きフェルールの第１形態例を示す図面であり、図１（ａ）は光ファイバ付きフェルールを、図１（ｂ）はフェルールを示す縦断面図である。また、図２は、本発明の光ファイバ付きフェルールの第２形態例を示す図面であり、図２（ａ）は光ファイバ付きフェルールを、図２（ｂ）はフェルールを示す縦断面図である。図１，図２において、符号１０は、光ファイバ心線３の先端にフェルール１１を取り付けてなる光ファイバ付きフェルールである。 The present invention will be described below with reference to the drawings based on the best mode.
FIG. 1 is a view showing a first embodiment of a ferrule with an optical fiber according to the present invention, FIG. 1 (a) is a ferrule with an optical fiber, and FIG. 1 (b) is a longitudinal sectional view showing a ferrule. Moreover, FIG. 2 is drawing which shows the 2nd example of the ferrule with an optical fiber of this invention, FIG. 2 (a) is a ferrule with an optical fiber, FIG.2 (b) is a longitudinal cross-sectional view which shows a ferrule. . 1 and 2, reference numeral 10 denotes a ferrule with an optical fiber in which a ferrule 11 is attached to the tip of an optical fiber core wire 3.

光ファイバ心線３は、裸光ファイバ１の外周に一次被覆４を設けてなる光ファイバ素線２の外周に二次被覆５が設けられたものである。光ファイバの種類は特に限定されるものではないが、例えば石英系シングルモード光ファイバや、クラッド内におけるコアの両側に応力付与材が設けられた偏波保持光ファイバ（ＰＡＮＤＡファイバ等）、ねじれを付与した光ファイバなど、各種光ファイバが挙げられる。裸光ファイバ１の外径は、約１２５μｍ、約８０μｍなどがあり、特に限定されない。
一次被覆４に用いられる樹脂としては、ＵＶ硬化樹脂などが例示される。また、二次被覆５に用いられる樹脂としてはポリアミド樹脂やポリエステル樹脂などが例示される。 The optical fiber core wire 3 is obtained by providing a secondary coating 5 on the outer periphery of an optical fiber 2 in which a primary coating 4 is provided on the outer periphery of the bare optical fiber 1. The type of optical fiber is not particularly limited. For example, a silica-based single mode optical fiber, a polarization maintaining optical fiber (PANDA fiber or the like) in which stress applying materials are provided on both sides of the core in the clad, Various optical fibers, such as an added optical fiber, may be mentioned. The outer diameter of the bare optical fiber 1 is about 125 μm, about 80 μm, etc., and is not particularly limited.
Examples of the resin used for the primary coating 4 include UV curable resins. Examples of the resin used for the secondary coating 5 include polyamide resin and polyester resin.

フェルール１１は、外方に突出するフランジ１３ａが側部に形成されたフェルール本体１３と、該フェルール本体１３の先端側に固定された略円柱形状のキャピラリー１２とを備える。
キャピラリー１２は、フェルール１１の先端側に設けられた接合端面１２ａと、該接合端面１２ａに開口されて裸光ファイバ１が挿入及び位置決めされる光ファイバ挿入穴１４と、該光ファイバ挿入穴１４の前記接合端面１２ａと反対側の後端側に連通するとともに光ファイバ素線２が挿入及び位置決めされる素線挿入穴１５を有する。キャピラリー１２は、例えばジルコニア（Ｚｒ）等のセラミック、非晶質ガラスや結晶化ガラス等のガラスなどから構成することができる。キャピラリー１２の外径は、ＪＩＳ Ｃ ５９７３等に記載のＳＣ形光コネクタ（ＳＣ：Single fiber Coupling）などに適用可能な約２．５ｍｍ、ＪＩＳ Ｃ ５９８３等に記載のＭＵ形光コネクタ（ＭＵ：Miniature-Unit coupling）などに適用可能な約１．２５ｍｍなど、特に限定なく採用可能である。光ファイバ挿入穴１４の内径と裸光ファイバ１の外径の差は、該裸光ファイバ１の位置決め性を確保できる程度に小さくしておくことが好ましい。
フェルール本体１３は、内部に光ファイバ心線３が挿入及び収納される心線挿入穴１６が形成されている。フェルール本体１３は、ジルコニア（Ｚｒ）、ステンレス（ＳＵＳ）や合成樹脂等から構成することができる。 The ferrule 11 includes a ferrule body 13 in which a flange 13 a protruding outward is formed on a side portion, and a substantially columnar capillary 12 fixed to the distal end side of the ferrule body 13.
The capillary 12 includes a joining end surface 12a provided on the front end side of the ferrule 11, an optical fiber insertion hole 14 through which the bare optical fiber 1 is inserted and positioned by being opened in the joining end surface 12a, and the optical fiber insertion hole 14 It has a strand insertion hole 15 which communicates with the rear end side opposite to the joint end face 12a and into which the optical fiber strand 2 is inserted and positioned. The capillary 12 can be made of, for example, ceramic such as zirconia (Zr), glass such as amorphous glass or crystallized glass, and the like. The outer diameter of the capillary 12 is about 2.5 mm applicable to an SC type optical connector (SC: Single fiber Coupling) described in JIS C 5973 and the like, and an MU type optical connector (MU: Miniature described in JIS C 5983). -Unit coupling) can be used without any particular limitation, such as about 1.25 mm. The difference between the inner diameter of the optical fiber insertion hole 14 and the outer diameter of the bare optical fiber 1 is preferably small enough to ensure the positioning of the bare optical fiber 1.
The ferrule body 13 is formed with a core wire insertion hole 16 into which the optical fiber core wire 3 is inserted and stored. The ferrule body 13 can be composed of zirconia (Zr), stainless steel (SUS), synthetic resin, or the like.

図４に示すように、光ファイバ素線２の一次被覆４の端部４ａは、光ファイバ挿入穴１４と素線挿入穴１５との間の中間部１７（第１の中間部）に突き当てられている。
一次被覆４の端部４ａが前記第１の中間部１７の内面に突き当たっていることにより、一次被覆４の端部４ａと第１の中間部１７の内面との間に溜まる接着剤Ａｄの量（体積）も少なくなるので、接着剤に生じる内部応力も小さくなり、光ファイバへの悪影響が一層抑制される。 As shown in FIG. 4, the end portion 4 a of the primary coating 4 of the optical fiber 2 abuts against an intermediate portion 17 (first intermediate portion) between the optical fiber insertion hole 14 and the strand insertion hole 15. It has been.
The amount of adhesive Ad that accumulates between the end portion 4a of the primary coating 4 and the inner surface of the first intermediate portion 17 due to the end portion 4a of the primary coating 4 abutting against the inner surface of the first intermediate portion 17. Since the (volume) is also reduced, the internal stress generated in the adhesive is also reduced, and the adverse effect on the optical fiber is further suppressed.

光ファイバ挿入穴１４と素線挿入穴１５との間の中間部１７は、内面がテーパ状のテーパ穴（第１のテーパ穴）になっている。この第１のテーパ穴１７の内面のテーパ角θ１は、１５°以上９０°以下である。θ１の一例として、約９０°を挙げることができる。第１のテーパ穴１７のテーパ角θ１が大きいほど、突き当てによる位置決め性が良好になる上、第１のテーパ穴１７内に溜まる接着剤Ａｄの量（体積）も少なくなるので、接着剤に生じる内部応力も小さくなるなど、光ファイバへの悪影響が抑制され、好ましい。テーパ角θ１が１５°未満である場合、一次被覆４の端部４ａを第１のテーパ穴１７の内面に突き当てたときに、光ファイバがテーパに沿って曲がったり、接着剤の量が多くなって接着剤の収縮等による悪影響が大きくなるなどの問題が生じるおそれがあり、好ましくない。 The intermediate portion 17 between the optical fiber insertion hole 14 and the strand insertion hole 15 is a tapered hole (first tapered hole) whose inner surface is tapered. The taper angle θ 1 of the inner surface of the first tapered hole 17 is 15 ° or more and 90 ° or less. An example of θ 1 can be about 90 ° . The greater the taper angle θ 1 of the first tapered hole 17, the better the positioning by abutment and the smaller the amount (volume) of the adhesive Ad that accumulates in the first tapered hole 17. This is preferable because adverse effects on the optical fiber can be suppressed. If the taper angle theta 1 is less than 15 °, when abutting the end 4a of the primary coating 4 on the inner surface of the first tapered hole 17, bend the optical fiber along the taper, the amount of adhesive There is a possibility that problems such as an increase in adverse effects due to shrinkage of the adhesive and the like may occur, which is not preferable.

図４に示すように、光ファイバ心線３の二次被覆５の端部５ａは、素線挿入穴１５と心線挿入穴１６との間の中間部１８（第２の中間部）に突き当てられている。
二次被覆の端部５ａが前記第２の中間部１８の内面に突き当たっていることにより、該端部５ａと第２の中間部１８の内面との間に溜まる接着剤Ａｄの量（体積）も少なくなるので、接着剤に生じる内部応力も小さくなり、光ファイバへの悪影響が一層抑制される。 As shown in FIG. 4, the end portion 5 a of the secondary coating 5 of the optical fiber core wire 3 projects into an intermediate portion 18 (second intermediate portion) between the strand insertion hole 15 and the core wire insertion hole 16. It has been applied.
The amount (volume) of the adhesive Ad accumulated between the end portion 5a and the inner surface of the second intermediate portion 18 by the end portion 5a of the secondary coating abutting against the inner surface of the second intermediate portion 18. Therefore, the internal stress generated in the adhesive is also reduced, and the adverse effect on the optical fiber is further suppressed.

素線挿入穴１５と心線挿入穴１６との間の中間部１８は、内面がテーパ状のテーパ穴（第２のテーパ穴）になっている。この第２のテーパ穴１８の内面のテーパ角θ２の大きさは、６０〜９０°の範囲内であり、その一例として、約６０°を挙げることができる。 The intermediate portion 18 between the strand insertion hole 15 and the core wire insertion hole 16 has a tapered hole (second tapered hole) whose inner surface is tapered. The inner surface of the size of the taper angle theta 2 of the second tapered hole 18 is in the range of 60 to 90 °, as an example, mention may be made of about 60 °.

キャピラリー１２内に形成された光ファイバ挿入穴１４と素線挿入穴１５との長さの比は、特に限定されるものではなく、図１に示すように光ファイバ挿入穴１４の長さＬ１が素線挿入穴１５の長さＬ２より長い構成も、図２に示すように素線挿入穴１５の長さＬ２が光ファイバ挿入穴１４の長さＬ１より長い構成も、あるいは図示は省略するが素線挿入穴１５の長さＬ２と光ファイバ挿入穴１４の長さＬ１とが同程度の長さとなる構成も、採用可能である。 The length ratio between the optical fiber insertion hole 14 and the strand insertion hole 15 formed in the capillary 12 is not particularly limited, and the length L 1 of the optical fiber insertion hole 14 as shown in FIG. There is also longer configuration than the length L 2 of the wire insertion hole 15, even longer construction than the length L 1 of the length L 2 is an optical fiber insertion hole 14 of the wire insertion hole 15 as shown in FIG. 2, or illustration structure omitted and the length L 1 of the length L 2 and the optical fiber insertion hole 14 of the wire insertion hole 15 becomes approximately the same length can also be employed.

素線挿入穴１５の内径と光ファイバ素線２の外径との差は、光ファイバ素線２の位置決め性を確保するため、光ファイバ素線２を素線挿入穴１５に挿入することができる限り、光ファイバ素線２の外周面が素線挿入穴１５の内面にほぼ密着する程度に小さくしておく。これにより、光ファイバ素線の中心線が素線挿入穴の中心線からずれることがなくなり、光ファイバ素線の中心ずれや曲がり等を抑制することができる。
素線挿入穴１５の内径と光ファイバ素線２の外径（一次被覆４の外径）の差が大きい場合には、光ファイバ素線２の外周（一次被覆４の上）に合成樹脂やエラストマー等からなる保護チューブ等を被せて径の差を調整することができる。光ファイバ素線に保護チューブ等を被せた場合には、この保護チューブ等の外周面が素線挿入穴の内面にほぼ密着する程度に差を小さくしておく。つまり、本発明において、光ファイバ素線とは、裸光ファイバと前記光ファイバ心線との中間の外径を持つものであればよく、裸光ファイバの上に一次被覆が設けられた本来の意味での光ファイバ素線のみならず、さらに一次被覆の上に保護チューブ等が被せられたものをも含めて言うものとする。
素線挿入穴１５による光ファイバ素線２の位置決め性の観点から、素線挿入穴１５の長さＬ２は２ｍｍ以上が好ましく、特に２〜５ｍｍが好ましい。 The difference between the inner diameter of the strand insertion hole 15 and the outer diameter of the optical fiber strand 2 is that the optical fiber strand 2 can be inserted into the strand insertion hole 15 in order to ensure the positioning of the optical fiber strand 2. As much as possible, the outer peripheral surface of the optical fiber 2 is made small enough to be in close contact with the inner surface of the strand insertion hole 15. As a result, the center line of the optical fiber strand does not deviate from the center line of the strand insertion hole, and center misalignment or bending of the optical fiber strand can be suppressed.
When the difference between the inner diameter of the strand insertion hole 15 and the outer diameter of the optical fiber 2 (the outer diameter of the primary coating 4) is large, a synthetic resin or the like is formed on the outer periphery of the optical fiber 2 (on the primary coating 4). The difference in diameter can be adjusted by covering a protective tube made of an elastomer or the like. When the optical fiber is covered with a protective tube or the like, the difference is made small to such an extent that the outer peripheral surface of the protective tube or the like is substantially in close contact with the inner surface of the strand insertion hole. In other words, in the present invention, the optical fiber is not particularly limited as long as it has an intermediate outer diameter between the bare optical fiber and the optical fiber core wire, and the original coating with the primary coating provided on the bare optical fiber. This includes not only the optical fiber in the sense but also those in which a protective tube or the like is covered on the primary coating.
From the viewpoint of positioning of the optical fiber 2 by the strand insertion hole 15, the length L2 of the strand insertion hole 15 is preferably 2 mm or more, and particularly preferably 2 to 5 mm.

心線挿入穴１６の内径と光ファイバ心線３の外径との差は、光ファイバ心線３の位置決め性の点では、光ファイバ心線３を心線挿入穴１６に挿入することができる限り、光ファイバ心線３の外周面が心線挿入穴１６の内面にほぼ密着する程度に小さくしておくことが好ましい。これにより、光ファイバ心線の中心線が心線挿入穴の中心線からずれることがなくなり、光ファイバ心線の中心ずれや曲がり等を抑制することができる。   The difference between the inner diameter of the core wire insertion hole 16 and the outer diameter of the optical fiber core wire 3 is that the optical fiber core wire 3 can be inserted into the core wire insertion hole 16 in terms of the positioning property of the optical fiber core wire 3. As long as the outer peripheral surface of the optical fiber core wire 3 is substantially close to the inner surface of the core wire insertion hole 16, it is preferable to make it small. As a result, the center line of the optical fiber core wire does not deviate from the center line of the core wire insertion hole, and the center deviation or bending of the optical fiber core wire can be suppressed.

次に、図１に示す光ファイバ付きフェルール１０の組立方法の一例を示す。まず、光ファイバ心線３の先端部の二次被覆５を除去して光ファイバ素線２を露出させる。さらに、光ファイバ素線２の先端部の一次被覆４を除去して裸光ファイバ１を露出させる。
裸光ファイバ１が露出された部分と光ファイバ心線３の先端部の二次被覆５の先端部との間に光ファイバ素線２の一次被覆４が露出される部分の長さは、素線挿入穴１５の長さＬ２と同程度にする。
裸光ファイバ１が露出される部分の長さは、光ファイバ挿入穴１４の長さＬ１と同程度またはＬ１以上とする。裸光ファイバ１が長くて先端が光ファイバ挿入穴１４よりも突出した場合には、切断や研磨等によって、裸光ファイバ１の端面がフェルール１１の接合端面１２ａに対して適切な位置になるように調整することができる。 Next, an example of the assembly method of the ferrule 10 with an optical fiber shown in FIG. 1 will be shown. First, the secondary coating 5 at the tip of the optical fiber core wire 3 is removed to expose the optical fiber strand 2. Further, the primary coating 4 at the tip of the optical fiber 2 is removed to expose the bare optical fiber 1.
The length of the portion where the primary coating 4 of the optical fiber 2 is exposed between the portion where the bare optical fiber 1 is exposed and the tip of the secondary coating 5 at the tip of the optical fiber core 3 is as follows. The length is approximately the same as the length L2 of the line insertion hole 15.
The length of the portion where the bare optical fiber 1 is exposed is about the same as the length L1 of the optical fiber insertion hole 14 or L1 or more. When the bare optical fiber 1 is long and the tip protrudes from the optical fiber insertion hole 14, the end face of the bare optical fiber 1 is positioned appropriately with respect to the joining end face 12a of the ferrule 11 by cutting or polishing. Can be adjusted.

この光ファイバ心線３の先端部をフェルール１１内に挿入し、裸光ファイバ１を光ファイバ挿入穴１４に、光ファイバ素線２を素線挿入穴１５に、それぞれ挿入及び位置決めする。図３に示すように、フェルール１１に光ファイバを挿入すると（図３中、接着剤の図示は省略してある。）、光ファイバ素線２の一次被覆４外周が素線挿入穴１５の内面に密着しながら案内されるので、光ファイバ素線２や裸光ファイバ１に曲げ応力が生じることが抑制される。   The tip of the optical fiber core 3 is inserted into the ferrule 11, and the bare optical fiber 1 is inserted into the optical fiber insertion hole 14 and the optical fiber strand 2 is inserted into the strand insertion hole 15 and positioned. As shown in FIG. 3, when the optical fiber is inserted into the ferrule 11 (in FIG. 3, the adhesive is not shown), the outer periphery of the primary coating 4 of the optical fiber 2 is the inner surface of the strand 15. Therefore, bending stress is suppressed from occurring in the optical fiber 2 and the bare optical fiber 1.

図４に示すように、光ファイバ素線２の一次被覆４の端部４ａが第１のテーパ穴１７の内面に突き当たったとき、一次被覆４の端部４ａは第１のテーパ穴１７の内面に対して真っ直ぐに突き当たるので、一次被覆４や裸光ファイバ１にストレスが加わることがなく、光ファイバ素線２は、素線挿入穴１５や第１のテーパ穴１７によって位置決めされた状態に保持される。また、隙間に充填された接着剤Ａｄの硬化や温度変化のために、接着剤Ａｄの収縮が起こった場合でも、素線挿入穴１５や第１のテーパ穴１７によって、光ファイバ素線２が周囲から均等に保持されているので、裸光ファイバ１の内部応力や曲げ変形など光伝送に不都合となる要因が抑制され、光特性が確実に維持される。
一次被覆４の端部４ａを第１のテーパ穴１７の内面に突き当てることにより、第１のテーパ穴１７内に溜まる接着剤Ａｄの量（体積）も少なくなるので、接着剤に生じる内部応力も小さくなり、光ファイバへの悪影響が一層抑制される。
光ファイバ素線２の外周と素線挿入穴１５の内面の隙間が小さいと、その隙間に充填される接着剤の量も少なくなるので、接着剤に生じる内部応力が小さくなり、光ファイバへの悪影響が一層抑制される効果も奏される。 As shown in FIG. 4, when the end 4 a of the primary coating 4 of the optical fiber 2 abuts against the inner surface of the first tapered hole 17, the end 4 a of the primary coating 4 becomes the inner surface of the first tapered hole 17. Therefore, the primary coating 4 and the bare optical fiber 1 are not stressed, and the optical fiber 2 is held in a state of being positioned by the strand insertion hole 15 and the first taper hole 17. Is done. Further, even when the adhesive Ad contracts due to the hardening of the adhesive Ad filled in the gap or the temperature change, the optical fiber strand 2 is formed by the strand insertion hole 15 or the first tapered hole 17. Since it is held uniformly from the surroundings, factors that are inconvenient for optical transmission such as internal stress and bending deformation of the bare optical fiber 1 are suppressed, and the optical characteristics are reliably maintained.
By abutting the end portion 4a of the primary coating 4 against the inner surface of the first taper hole 17, the amount (volume) of the adhesive Ad accumulated in the first taper hole 17 is also reduced, so that the internal stress generated in the adhesive And the adverse effect on the optical fiber is further suppressed.
If the gap between the outer periphery of the optical fiber 2 and the inner surface of the strand insertion hole 15 is small, the amount of the adhesive filled in the gap is also reduced, so the internal stress generated in the adhesive is reduced, and the optical fiber There is also an effect that the adverse effect is further suppressed.

さらに、本形態例においては、図４に示すように、光ファイバ心線３の二次被覆５の端部５ａが第２のテーパ穴１８の内面に突き当てられる。二次被覆５の端部５ａを第２のテーパ穴１８の内面に突き当てることにより、第２のテーパ穴１８内に溜まる接着剤Ａｄの量（体積）も少なくなるので、接着剤Ａｄの内部応力も小さくなり、光ファイバへの悪影響が一層抑制される。
また、光ファイバ心線３の外周と心線挿入穴１６の内面との間の隙間も、心線挿入穴１６によって光ファイバ心線３を位置決めできるように、充分に小さいことが望ましい。光ファイバ心線３の外周が心線挿入穴１６の内面に密着しながら挿入されることにより、二次被覆５の端部５ａが第２のテーパ穴１８の内面に対して真っ直ぐに突き当たるので、二次被覆５等にストレスが加わることがなく、光ファイバ心線３は、心線挿入穴１６によって位置決めされた状態に保持される。また、隙間に充填された接着剤Ａｄの硬化や温度変化のために、接着剤Ａｄの収縮が起こった場合でも、心線挿入穴１６によって、光ファイバ心線３が周囲から均等に保持されているので、光ファイバの内部応力や曲げ変形など光伝送に不都合となる要因が抑制され、光特性が一層確実に維持される。
光ファイバ心線３の外周と心線挿入穴１６の内面の隙間が小さいと、その隙間に充填される接着剤の量も少なくなるので、接着剤に生じる内部応力が小さくなり、光ファイバへの悪影響が一層抑制される効果も奏される。 Furthermore, in this embodiment, as shown in FIG. 4, the end portion 5 a of the secondary coating 5 of the optical fiber core wire 3 is abutted against the inner surface of the second tapered hole 18. By abutting the end portion 5a of the secondary coating 5 against the inner surface of the second taper hole 18, the amount (volume) of the adhesive Ad accumulated in the second taper hole 18 is also reduced. The stress is also reduced, and the adverse effect on the optical fiber is further suppressed.
The gap between the outer periphery of the optical fiber core wire 3 and the inner surface of the core wire insertion hole 16 is desirably small enough so that the optical fiber core wire 3 can be positioned by the core wire insertion hole 16. Since the outer periphery of the optical fiber core wire 3 is inserted in close contact with the inner surface of the core wire insertion hole 16, the end portion 5a of the secondary coating 5 directly strikes the inner surface of the second tapered hole 18, No stress is applied to the secondary coating 5 or the like, and the optical fiber core wire 3 is held in a state of being positioned by the core wire insertion hole 16. Further, even when the adhesive Ad contracts due to the hardening of the adhesive Ad filled in the gap or the temperature change, the optical fiber core wire 3 is evenly held from the periphery by the core wire insertion hole 16. Therefore, factors that are inconvenient for optical transmission such as internal stress and bending deformation of the optical fiber are suppressed, and the optical characteristics are more reliably maintained.
If the gap between the outer periphery of the optical fiber core 3 and the inner surface of the core wire insertion hole 16 is small, the amount of adhesive filled in the gap is also reduced, so the internal stress generated in the adhesive is reduced, and the There is also an effect that the adverse effect is further suppressed.

裸光ファイバ１は、光ファイバ挿入穴１４に接着剤（図示略）を充填することにより固定することができる。接着剤は、光ファイバをフェルールに挿入する前に光ファイバの周囲に塗布してもよく、また、予め接着剤をフェルール内に注入してから光ファイバを挿入してもよい。または、光ファイバをフェルールに挿入した後に両者の隙間に注入することもできる。   The bare optical fiber 1 can be fixed by filling the optical fiber insertion hole 14 with an adhesive (not shown). The adhesive may be applied around the optical fiber before the optical fiber is inserted into the ferrule, or the optical fiber may be inserted after injecting the adhesive into the ferrule in advance. Or after inserting an optical fiber in a ferrule, it can also inject | pour into the clearance gap between both.

本形態例の光ファイバ付きフェルールによれば、素線挿入穴１５と心線挿入穴１６との間の中間部１８が裸光ファイバ１から離れており、光ファイバ挿入穴１４と心線挿入穴１６との間に設けられた素線挿入穴１５によって光ファイバ素線２を位置決め固定することができるので、光ファイバ心線３の曲がりや二次被覆５のストレス等が光ファイバ挿入穴１４内の裸光ファイバ１に影響を与えにくくなる。また、裸光ファイバ１が近接する光ファイバ挿入穴１４と素線挿入穴１５との間の中間部１７の縮小比が従来構成に比して小さくなることから、光ファイバ素線２の端部（裸光ファイバ１が露出された部分の側）にストレスが集中しにくく、接着剤の収縮や気泡の影響も生じにくい。このため、光ファイバの特性劣化が少なく、特性の優れた光ファイバ付きフェルールを得ることができる。 According to the ferrule with an optical fiber of this embodiment, the intermediate portion 18 between the strand insertion hole 15 and the core insertion hole 16 is separated from the bare optical fiber 1, and the optical fiber insertion hole 14 and the core insertion hole Since the optical fiber strand 2 can be positioned and fixed by the strand insertion hole 15 provided between the optical fiber core 16 and the optical fiber strand 3, the bending of the optical fiber core 3, the stress of the secondary coating 5, etc. The bare optical fiber 1 is hardly affected. Further, since the reduction ratio of the intermediate portion 17 between the optical fiber insertion hole 14 and the strand insertion hole 15 with which the bare optical fiber 1 is close is smaller than that in the conventional configuration, the end portion of the optical fiber strand 2 is reduced. Stress is less likely to concentrate on the side where the bare optical fiber 1 is exposed, and adhesive shrinkage and bubbles are less likely to occur. For this reason, there is little characteristic deterioration of an optical fiber, and the ferrule with an optical fiber excellent in the characteristic can be obtained.

裸光ファイバの径（クラッド径）が約０．１２５ｍｍ、一次被覆径が約０．４ｍｍ、二次被覆径が約０．９ｍｍである光ファイバ心線を用い、この光ファイバ心線の先端にフェルールを取り付けてなる光ファイバ付きフェルールの消光比を測定した。本実施例において、フェルールの光ファイバ挿入穴の内径は約０．１２６ｍｍ、素線挿入穴の内径は約０．４ｍｍ、心線挿入穴の内径は約１．０ｍｍとした。
図１、図２に示すフェルールにおいて、第１のテーパ穴１７のテーパ角θ１は約９０°であり、第２のテーパ穴１８のテーパ角θ２は約６０°である。 An optical fiber core wire having a bare optical fiber diameter (cladding diameter) of about 0.125 mm, a primary coating diameter of about 0.4 mm, and a secondary coating diameter of about 0.9 mm is used at the tip of the optical fiber core wire. The extinction ratio of a ferrule with an optical fiber attached with a ferrule was measured. In this example, the inner diameter of the ferrule optical fiber insertion hole was about 0.126 mm, the inner diameter of the strand insertion hole was about 0.4 mm, and the inner diameter of the core insertion hole was about 1.0 mm.
In the ferrule shown in FIGS. 1 and 2, the taper angle θ1 of the first taper hole 17 is about 90 °, and the taper angle θ2 of the second taper hole 18 is about 60 °.

図１や図２に示すように、光ファイバ挿入穴と心線挿入穴との間に素線挿入穴が設けられたフェルールを用い、素線挿入穴に光ファイバ素線が位置決めされるようにして光ファイバを固定して光ファイバ付きフェルールを構成したところ、消光比を３８〜３９ｄＢ程度にまで向上させることができた。これは、光ファイバ挿入穴と心線挿入穴との間に素線挿入穴があり、光ファイバ挿入穴の内径に比して素線挿入穴の内径があまり大きくないため、接着剤の収縮や気泡の影響等が抑制されたものと考えられる。
これに対して、図５や図６に示すように、光ファイバ挿入穴と心線挿入穴とがテーパ穴で連通されたフェルールを用いて光ファイバ付きフェルールを構成したところ、消光比は２８ｄＢ程度にとどまった。これは、光ファイバ挿入穴が直接心線挿入穴につながっており、光ファイバ挿入穴の内径に比して心線挿入穴の内径がかなり大きいものであるため、光ファイバ挿入穴と心線挿入穴との間のテーパ穴にかなりの量の接着剤がたまり、該接着剤の収縮や接着剤中の気泡等の影響のためと考えられる。 As shown in FIG. 1 and FIG. 2, a ferrule having a strand insertion hole between the optical fiber insertion hole and the core insertion hole is used so that the optical fiber strand is positioned in the strand insertion hole. Then, when the optical fiber was fixed and a ferrule with an optical fiber was configured, the extinction ratio could be improved to about 38 to 39 dB. This is because there is a strand insertion hole between the optical fiber insertion hole and the core wire insertion hole, and the inner diameter of the strand insertion hole is not so large compared to the inner diameter of the optical fiber insertion hole. It is thought that the influence of air bubbles was suppressed.
On the other hand, as shown in FIGS. 5 and 6, when a ferrule with an optical fiber is configured using a ferrule in which an optical fiber insertion hole and a core wire insertion hole communicate with each other through a tapered hole, the extinction ratio is about 28 dB. I stayed at. This is because the optical fiber insertion hole is directly connected to the core insertion hole, and the inner diameter of the core insertion hole is considerably larger than the inner diameter of the optical fiber insertion hole. A considerable amount of adhesive accumulates in the taper hole between the holes, and this is considered to be due to the influence of shrinkage of the adhesive, bubbles in the adhesive, and the like.

本発明は、光ファイバを用いた光通信や光計測などの種々の分野において、光ファイバを光接続するために利用することができる。   The present invention can be used to optically connect optical fibers in various fields such as optical communication and optical measurement using optical fibers.

（ａ）本発明の光ファイバ付きフェルールの第１形態例を示す縦断面図である。（ｂ）第１形態例におけるフェルールを示す縦断面図である。(A) It is a longitudinal cross-sectional view which shows the 1st example of a ferrule with an optical fiber of this invention. (B) It is a longitudinal cross-sectional view which shows the ferrule in a 1st form example. （ａ）本発明の光ファイバ付きフェルールの第２形態例を示す縦断面図である。（ｂ）第２形態例におけるフェルールを示す縦断面図である。(A) It is a longitudinal cross-sectional view which shows the 2nd example of a ferrule with an optical fiber of this invention. (B) It is a longitudinal cross-sectional view which shows the ferrule in a 2nd example. フェルール内に光ファイバ心線を挿入する様子を説明する部分縦断面図である。It is a fragmentary longitudinal cross-section explaining a mode that an optical fiber core wire is inserted in a ferrule. フェルール内に光ファイバ心線が接着固定された状態を説明する部分縦断面図である。It is a fragmentary longitudinal cross-section explaining the state by which the optical fiber core wire was bonded and fixed in the ferrule. 従来の光ファイバ付きフェルールの第１例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the 1st example of the conventional ferrule with an optical fiber. 従来の光ファイバ付きフェルールの第２例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the 2nd example of the conventional ferrule with an optical fiber. 従来の光ファイバ付きフェルールにおいて、テーパ穴付近での接着Bonding near tapered hole in conventional ferrule with optical fiber 剤の収縮の影響を説明する部分縦断面図である。It is a fragmentary longitudinal cross-sectional view explaining the influence of the shrinkage | contraction of an agent. 従来の光ファイバ付きフェルールに光ファイバを挿入するときの問Problems when inserting an optical fiber into a conventional ferrule with an optical fiber 題点を説明するための部分縦断面図であり、（ａ）は、光ファイバを挿入する様子を示し、（ｂ）は、光ファイバの樹脂被覆の端部がテーパ穴に突き当たって曲がった様子を示す。It is a fragmentary longitudinal cross-sectional view for demonstrating a subject, (a) shows a mode that an optical fiber is inserted, (b) A mode that the edge part of the resin coating of the optical fiber hit | abutted the taper hole, and was bent Indicates.

符号の説明Explanation of symbols

１…裸光ファイバ、２…光ファイバ素線、３…光ファイバ心線、４…一次被覆、４ａ…一次被覆の端部、５…二次被覆、５ａ…二次被覆の端部、６…接着部、１０…光ファイバ付きフェルール、１１…フェルール、１２ａ…接合端面、１４…光ファイバ挿入穴、１５…素線挿入穴、１６…心線挿入穴、１７…光ファイバ挿入穴と素線挿入穴との間の中間部（第１のテーパ穴）、１８…素線挿入穴と心線挿入穴との間の中間部（第２のテーパ穴）。 DESCRIPTION OF SYMBOLS 1 ... Bare optical fiber, 2 ... Optical fiber strand, 3 ... Optical fiber core wire, 4 ... Primary coating, 4a ... End of primary coating , 5 ... Secondary coating , 5a ... End of secondary coating , 6 ... Bonding part, 10 ... Ferrule with optical fiber, 11 ... Ferrule, 12a ... Joining end face, 14 ... Optical fiber insertion hole, 15 ... Strand insertion hole, 16 ... Core wire insertion hole, 17 ... Optical fiber insertion hole and strand insertion Intermediate part between the holes (first taper hole), 18... Intermediate part between the strand insertion hole and the core wire insertion hole (second taper hole).

Claims (1)

裸光ファイバの外周に一次被覆を設けてなる光ファイバ素線の外周に二次被覆が設けられた光ファイバ心線の先端にフェルールを取り付け、前記フェルールに挿入された光ファイバをフェルール内に接着剤で接着してなる光ファイバ付きフェルールであって、
フェルールは、フェルール本体とその先端側に固定されたキャピラリーとを備え、
前記キャピラリーは、接合端面に開口されて裸光ファイバが挿入及び位置決めされる光ファイバ挿入穴と、該光ファイバ挿入穴の前記接合端面と反対側の後端側に連通するとともに光ファイバ素線が挿入及び位置決めされる素線挿入穴とを有しており、
前記フェルール本体は、前記素線挿入穴の前記光ファイバ挿入穴と反対側の後端側に連通するとともに光ファイバ心線が挿入及び収納される心線挿入穴とを有しており、
前記光ファイバ挿入穴と前記素線挿入穴との間の第１のテーパ穴および前記素線挿入穴と心線挿入穴との間の第２のテーパ穴が前記キャピラリーに形成されており、
前記第１のテーパ穴のテーパ角が１５〜９０°の範囲内、前記第２のテーパ穴のテーパ角が６０〜９０°の範囲内であり、
前記光ファイバ素線の一次被覆の端部が前記第１のテーパ穴に突き当てられ、一次被覆の端部の周縁が第１のテーパ穴の内面への突き当てにより内向きにつぶされているとともに、前記光ファイバ心線の二次被覆の端部が前記第２のテーパ穴に突き当てられ、二次被覆の端部の周縁が第２のテーパ穴の内面への突き当てにより内向きにつぶされていることを特徴とする光ファイバ付きフェルール。 A ferrule is attached to the tip of an optical fiber core wire that is provided with a secondary coating on the outer periphery of an optical fiber that has a primary coating on the outer periphery of the bare optical fiber, and the optical fiber inserted into the ferrule is bonded to the ferrule. It is a ferrule with an optical fiber bonded with an agent,
The ferrule includes a ferrule body and a capillary fixed to the tip side thereof,
The capillary communicates with an optical fiber insertion hole which is opened at a joining end face and a bare optical fiber is inserted and positioned, and a rear end side opposite to the joining end face of the optical fiber insertion hole, and an optical fiber strand is connected to the capillary. A wire insertion hole to be inserted and positioned,
The ferrule body has a core wire insertion hole that communicates with a rear end side opposite to the optical fiber insertion hole of the strand insertion hole and into which an optical fiber core wire is inserted and stored,
A first taper hole between the optical fiber insertion hole and the strand insertion hole and a second taper hole between the strand insertion hole and the core insertion hole are formed in the capillary;
The taper angle of the first taper hole is in the range of 15 to 90 °, and the taper angle of the second taper hole is in the range of 60 to 90 °;
The end portion of the primary coating of the optical fiber is abutted against the first tapered hole, and the peripheral edge of the end portion of the primary coating is crushed inward by abutting against the inner surface of the first tapered hole. In addition, the end of the secondary coating of the optical fiber core is abutted against the second tapered hole, and the peripheral edge of the end of the secondary coating is inward by abutting against the inner surface of the second tapered hole. A ferrule with an optical fiber, which is crushed .
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