JP6782451B2 - Manufacturing method of optical fiber body with terminal fittings and optical fiber body with terminal fittings - Google Patents

Manufacturing method of optical fiber body with terminal fittings and optical fiber body with terminal fittings Download PDF

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JP6782451B2
JP6782451B2 JP2018005188A JP2018005188A JP6782451B2 JP 6782451 B2 JP6782451 B2 JP 6782451B2 JP 2018005188 A JP2018005188 A JP 2018005188A JP 2018005188 A JP2018005188 A JP 2018005188A JP 6782451 B2 JP6782451 B2 JP 6782451B2
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fiber body
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関　勝男
勝男 関
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NHK Spring Co Ltd
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Description

本発明は、コネクタ等に接続されて光信号等を伝送するための端末金具付き光ファイバの製造方法に関するものである。 The present invention relates to a method for manufacturing an optical fiber with a terminal fitting for transmitting an optical signal or the like by being connected to a connector or the like.

光ファイババンドル及び光ファイババンドルの製造方法が特許文献１に開示されている。この特許文献１に記載されている光ファイババンドルの製造方法は、光伝送性能の優れた光ファイババンドルを製造するものであり、加熱した切断手段による仮融着工程と、中空円筒形状の部材である端末金具に通す収束工程と、加熱処理によって光ファイバ同士を融着させる融着工程とを備えている。しかしながら、光ファイバの端面を加熱する工程は、そのための装置が必要となり、手間がかかり面倒である。また、加熱のみでは光ファイバ同士が均一に融着するかどうかも不安定であり、伝送ロスの原因にもなる。 Patent Document 1 discloses an optical fiber bundle and a method for manufacturing an optical fiber bundle. The method for manufacturing an optical fiber bundle described in Patent Document 1 is to manufacture an optical fiber bundle having excellent optical transmission performance, which comprises a temporary fusion step using a heated cutting means and a hollow cylindrical member. It includes a convergence step of passing it through a certain terminal fitting and a fusion step of fusing the optical fibers together by heat treatment. However, the step of heating the end face of the optical fiber requires a device for that purpose, which is troublesome and troublesome. In addition, it is unstable whether or not the optical fibers are uniformly fused to each other only by heating, which causes transmission loss.

一方で、光ファイバ同士を接着剤で接着することも考えられるが、接着剤の含有成分が光ファイバに化学的に作用することがあり、例えば着色されてしまうこと等で伝送特性に影響を及ぼすことがある。また、接着剤を使用した場合は後工程でバンドルの端面を研磨しなければならず、そのための工程が必要となってしまう。また接着剤を用いてしまうと、加熱した切断手段であるヒートナイフでも切断することができなくなり、後工程の制約となってしまう。 On the other hand, it is conceivable to bond the optical fibers to each other with an adhesive, but the components contained in the adhesive may chemically act on the optical fibers, and for example, they may be colored, which affects the transmission characteristics. Sometimes. In addition, when an adhesive is used, the end face of the bundle must be polished in a subsequent process, which requires a process for that purpose. Further, if an adhesive is used, it cannot be cut even with a heat knife, which is a heated cutting means, which limits the subsequent process.

特開２００１−３４３５３７号公報Japanese Unexamined Patent Publication No. 2001-343537

本発明は、上記従来技術を考慮したものであり、簡単且つ迅速に、そして効率よく端末金具に対して強固に光ファイバを固定することができる端末金具付き光ファイバの製造方法を提供することを目的とする。 The present invention takes into consideration the above-mentioned prior art, and provides a method for manufacturing an optical fiber with a terminal fitting, which can easily, quickly, and efficiently fix the optical fiber firmly to the terminal fitting. The purpose.

前記目的を達成するため、本発明では、中空筒形状の端末金具に対して光ファイバを挿通する挿通工程と、前記端末金具に対して周方向から外圧を加え、前記光ファイバを前記端末金具内で圧着させて固定する圧着工程と、前記端末金具の一方の端部からはみ出ている前記光ファイバを切断具により切断し、前記光ファイバを前記端末金具内で融着させる切断工程とを備えたことを特徴とする端末金具付き光ファイバの製造方法を提供する。 In order to achieve the above object, in the present invention, in the insertion step of inserting an optical fiber into a hollow tubular terminal fitting, and by applying an external pressure to the terminal fitting from the circumferential direction, the optical fiber is inserted into the terminal fitting. The present invention includes a crimping step of crimping and fixing the terminal fitting, and a cutting step of cutting the optical fiber protruding from one end of the terminal fitting with a cutting tool and fusing the optical fiber in the terminal fitting. Provided is a method for manufacturing an optical fiber with a terminal fitting, which is characterized in that.

好ましくは、前記光ファイバは、プラスチックファイバである。 Preferably, the optical fiber is a plastic fiber.

好ましくは、前記圧着工程にて、前記端末金具の外表面が横断面視で多角形状とし、さらに前記端末金具の内壁面が横断面視で前記端末金具の外表面と同様の多角形状となるように外圧を加える。 Preferably, in the crimping step, the outer surface of the terminal fitting has a polygonal shape in a cross-sectional view, and the inner wall surface of the terminal fitting has a polygonal shape similar to the outer surface of the terminal fitting in a cross-sectional view. Apply external pressure to.

好ましくは、前記光ファイバは複数本で形成され、前記圧着工程にて、前記光ファイバの外表面が前記端末金具の外表面と同様の多角形状となるように外圧を加える。 Preferably, the optical fiber is formed of a plurality of fibers, and an external pressure is applied in the crimping step so that the outer surface of the optical fiber has a polygonal shape similar to the outer surface of the terminal fitting.

本発明によれば、端末金具に対して挿通された光ファイバは圧着されて強固に固定される。そして、余剰部分を切断工程で切断されるため、光ファイバの端部を加熱するような加熱工程を必要とせずに端末金具付き光ファイバを形成することができる。このため、簡単且つ迅速に、そして効率よく端末金具に対して強固に光ファイバを固定することができる。 According to the present invention, the optical fiber inserted through the terminal fitting is crimped and firmly fixed. Since the excess portion is cut in the cutting step, the optical fiber with a terminal fitting can be formed without the need for a heating step such as heating the end portion of the optical fiber. Therefore, the optical fiber can be firmly fixed to the terminal fitting easily, quickly, and efficiently.

また、光ファイバとしてプラスチックファイバを用いることで、圧着工程での圧着性能が向上し、さらに切断工程での融着性能が向上する。 Further, by using a plastic fiber as the optical fiber, the crimping performance in the crimping process is improved, and the fusion performance in the cutting process is further improved.

また、圧着工程で多角形状となるように外圧を加えることで、一般的に豊富に入手できる工具を使用することができ工程が容易となる。横断面視にて円形状となるように外圧を加えると、治具の継ぎ目部分でバリが発生しやすく、その除去工程が別途必要となってしまうため、多角形状の方が好ましいといえる。また、端末金具の内壁面も横断面視にて多角形状となるように外圧を加えることで、端末金具に固定された光ファイバの周方向への回転を抑制でき、端末金具から光ファイバが抜けてしまうことを防止できる。 Further, by applying an external pressure so as to have a polygonal shape in the crimping process, generally abundantly available tools can be used and the process becomes easy. When an external pressure is applied so as to form a circular shape in a cross-sectional view, burrs are likely to occur at the joint portion of the jig, and a separate removal step is required. Therefore, it can be said that the polygonal shape is preferable. In addition, by applying external pressure so that the inner wall surface of the terminal fitting also has a polygonal shape in cross-sectional view, it is possible to suppress the rotation of the optical fiber fixed to the terminal fitting in the circumferential direction, and the optical fiber comes off from the terminal fitting. It can be prevented from being lost.

また、光ファイバが複数本の場合、圧着工程にて光ファイバ自体も多角形状となるまで外圧を加えることで、光ファイバ同士が隙間なく互いに密着するため、光信号の伝送特性を向上させることができる。また、光ファイバが多角形状となることで強度的にも向上する。 Further, when there are a plurality of optical fibers, the optical fibers themselves are brought into close contact with each other without gaps by applying external pressure until the optical fibers themselves have a polygonal shape in the crimping process, so that the transmission characteristics of optical signals can be improved. it can. In addition, the optical fiber has a polygonal shape, which improves the strength.

本発明に係る端末金具付き光ファイバの製造方法のフローチャートである。It is a flowchart of the manufacturing method of the optical fiber with a terminal metal fitting which concerns on this invention. 端末金具の概略図である。It is a schematic diagram of a terminal metal fitting. 挿通工程にて光ファイバを端末金具に挿通する前の概略側面図である。It is a schematic side view before inserting an optical fiber into a terminal metal fitting in the insertion process. 挿通工程にて光ファイバが端末金具を挿通した後の概略側面図である。It is a schematic side view after the optical fiber inserted the terminal metal fitting in the insertion process. 挿通工程にて光ファイバが端末金具を挿通している状態を挿通方向から視た概略図である。It is the schematic which looked at the state which the optical fiber inserts a terminal metal fitting in the insertion process from the insertion direction. 圧着工程を経た端末金具及び光ファイバの概略側面図である。It is a schematic side view of the terminal metal fitting and an optical fiber which went through a crimping process. 圧着工程を経た端末金具及び光ファイバを挿通方向から視た概略図である。It is the schematic which looked at the terminal metal fitting and the optical fiber which went through a crimping process from the insertion direction. 切断工程での端末金具及び光ファイバの概略側面図である。It is a schematic side view of a terminal metal fitting and an optical fiber in a cutting process. 端末金具付き光ファイバの概略図である。It is the schematic of the optical fiber with a terminal metal fitting. 光ファイバが１本の場合の端末金具付き光ファイバの概略断面図である。It is the schematic sectional drawing of the optical fiber with a terminal metal fitting in the case of one optical fiber.

図１に示すように、本発明に係る端末金具付き光ファイバの製造方法は、まず挿通工程が行われる（ステップＳ１）。この工程は、中空筒形状の端末金具１に対して光ファイバ２を挿通する工程である。なお、以下では複数本の光ファイバ２が束ねられて端末金具１に取り付けられたいわゆるバンドルファイバについて説明するが、本発明は１本の光ファイバに対して端末金具１を取り付ける方法にも適用できる（図１０参照）。また、本発明で製造される光ファイバは、通信、照明、映像のいずれの用途にも適用可能である。 As shown in FIG. 1, in the method for manufacturing an optical fiber with a terminal fitting according to the present invention, a insertion step is first performed (step S1). This step is a step of inserting the optical fiber 2 through the hollow tubular terminal fitting 1. In the following, a so-called bundle fiber in which a plurality of optical fibers 2 are bundled and attached to the terminal fitting 1 will be described, but the present invention can also be applied to a method of attaching the terminal fitting 1 to one optical fiber. (See FIG. 10). Further, the optical fiber manufactured by the present invention can be applied to any of communication, lighting, and video applications.

図２に示すように、端末金具１は、中空の略円筒形状であり、長手方向を貫通する貫通孔３を有している。この貫通孔３を形成する内壁は端末金具１の内壁面４として形成され、端末金具１の外側の面は外表面５として形成されている。図３に示すように、複数本の光ファイバ２を一方向に移動させ（図３の矢印Ｆ方向）、端末金具１の貫通孔３内に挿通する。このとき、図４に示すように、光ファイバ２の一方の端部が貫通孔３を完全に通り抜け、端末金具１からはみ出る位置まで挿通する。この状態では、図５に示すように、隣り合う光ファイバ２には隙間が多々あり、端末金具１内では光ファイバ２は挿通方向に自由に移動でき、何ら固定（保持）されていない状態である。 As shown in FIG. 2, the terminal metal fitting 1 has a hollow substantially cylindrical shape and has a through hole 3 penetrating in the longitudinal direction. The inner wall forming the through hole 3 is formed as the inner wall surface 4 of the terminal fitting 1, and the outer surface of the terminal fitting 1 is formed as the outer surface 5. As shown in FIG. 3, a plurality of optical fibers 2 are moved in one direction (direction of arrow F in FIG. 3) and inserted into the through hole 3 of the terminal fitting 1. At this time, as shown in FIG. 4, one end of the optical fiber 2 completely passes through the through hole 3 and is inserted to a position where it protrudes from the terminal fitting 1. In this state, as shown in FIG. 5, there are many gaps between the adjacent optical fibers 2, and the optical fibers 2 can freely move in the insertion direction in the terminal fitting 1, and are not fixed (held) at all. is there.

次に、圧着工程を行う（ステップＳ２）。この工程は、端末金具１に対して周方向から外圧を加え、光ファイバ２を端末金具１内で圧着させて固定する工程である。図６及び図７に示すように、端末金具１の一方の端部側に対して外圧を加え、その径を縮小させる。具体的には、端末金具１の外表面５に対して多方向（図では６方向）から均一に万遍なく力を加え、内側方向に圧縮させて圧縮部８を形成する。このとき、端末金具１の外表面は横断面視にて略六角形形状となるまで変形される。これにより、端末金具１に対して挿通された光ファイバ２は互いに、あるいは端末金具１の内壁面４に圧着されて強固に固定される。 Next, a crimping step is performed (step S2). This step is a step of applying an external pressure to the terminal fitting 1 from the circumferential direction and crimping the optical fiber 2 inside the terminal fitting 1 to fix the optical fiber 2. As shown in FIGS. 6 and 7, an external pressure is applied to one end side of the terminal fitting 1 to reduce its diameter. Specifically, a force is uniformly and evenly applied to the outer surface 5 of the terminal fitting 1 from multiple directions (6 directions in the figure) and compressed inward to form the compression portion 8. At this time, the outer surface of the terminal fitting 1 is deformed until it has a substantially hexagonal shape in cross-sectional view. As a result, the optical fibers 2 inserted through the terminal fitting 1 are crimped to each other or to the inner wall surface 4 of the terminal fitting 1 to be firmly fixed.

この外圧のかけ方は端末金具１に対してどのような方向から加えてもよく、結果として端末金具１が任意の多角形状あるいは円形状となるようにしてもよい。すなわち、圧縮部８が横断面視にて任意の多角形状又は円形状となるように形成してもよい。ただ、このように多角形状に外圧を加えることは、横断面視にて円形状となるように外圧を加えることに比べ、治具の継ぎ目部分でバリが発生しにくい。円形状に外圧を加えてしまうと、その除去工程が別途必要となってしまうため、多角形状に形成する方が好ましいといえる。また、圧着工程で多角形状となるように外圧を加えることは、一般的に豊富に入手できる工具を使用することができるので、工程作業が容易となる。 This external pressure may be applied to the terminal fitting 1 from any direction, and as a result, the terminal fitting 1 may have an arbitrary polygonal shape or a circular shape. That is, the compression portion 8 may be formed so as to have an arbitrary polygonal shape or a circular shape in a cross-sectional view. However, applying external pressure to the polygonal shape in this way is less likely to cause burrs at the joint portion of the jig than applying external pressure so as to form a circular shape in a cross-sectional view. If an external pressure is applied to the circular shape, a separate removal step is required, so it can be said that it is preferable to form the circular shape into a polygonal shape. Further, in applying external pressure so as to have a polygonal shape in the crimping process, generally abundantly available tools can be used, so that the process work becomes easy.

上記の圧着工程の際、図７に示すように、端末金具１の内壁面４が横断面視で端末金具１の外表面（圧縮部８の外表面）と同様の多角形状となるように外圧を加えてもよい。このように端末金具１の内壁面３も横断面視にて多角形状となるように外圧を加えることで、端末金具１に固定された光ファイバ２の周方向への回転を抑制でき、端末金具１から光ファイバが抜けてしまうことを防止できる。 During the above crimping process, as shown in FIG. 7, external pressure is applied so that the inner wall surface 4 of the terminal fitting 1 has a polygonal shape similar to the outer surface of the terminal fitting 1 (outer surface of the compression portion 8) in cross-sectional view. May be added. In this way, by applying external pressure so that the inner wall surface 3 of the terminal fitting 1 also has a polygonal shape in cross-sectional view, it is possible to suppress the rotation of the optical fiber 2 fixed to the terminal fitting 1 in the circumferential direction. It is possible to prevent the optical fiber from coming off from 1.

さらに、図７のように光ファイバ２の外表面が端末金具１の外表面（圧縮部８の外表面）と同様の多角形状となるように外圧を加えてもよい。このように、圧着工程にて光ファイバ２自体も多角形状となるまで外圧を加えることで、光ファイバ２同士が隙間なく互いに密着するため、光の密度が高まり、光信号の伝送特性を向上させることができる。また、光ファイバ２が多角形状となることで強度的にも向上する。 Further, as shown in FIG. 7, external pressure may be applied so that the outer surface of the optical fiber 2 has a polygonal shape similar to the outer surface of the terminal fitting 1 (the outer surface of the compression portion 8). In this way, by applying external pressure until the optical fiber 2 itself has a polygonal shape in the crimping process, the optical fibers 2 are in close contact with each other without gaps, so that the density of light is increased and the transmission characteristics of optical signals are improved. be able to. Further, the optical fiber 2 has a polygonal shape, which improves the strength.

次に、切断工程を行う（ステップＳ３）。この工程は、端末金具１の一方の端部からはみ出ている光ファイバ２を加熱した切断具（ヒートナイフ６）により切断し、光ファイバ２を端末金具１内で融着させる工程である。この切断工程にて光ファイバ２の余剰部分を切断することで、光ファイバ２の端部を加熱するような加熱工程を必要とせずに端末金具付き光ファイバ７（図９参照）を形成することができる。 Next, a cutting step is performed (step S3). This step is a step of cutting the optical fiber 2 protruding from one end of the terminal fitting 1 with a heated cutting tool (heat knife 6) and fusing the optical fiber 2 in the terminal fitting 1. By cutting the excess portion of the optical fiber 2 in this cutting step, the optical fiber 7 with a terminal fitting (see FIG. 9) is formed without the need for a heating step such as heating the end portion of the optical fiber 2. Can be done.

切断工程では、図８に示すように、ヒートナイフ６を端末金具１の端面に沿って移動させ、端末金具１から突出している光ファイバ２を切断する。このとき、ヒートナイフ６の熱により光ファイバ２同士は微弱に融着し、互いに接合する。なお、ヒートナイフ６による光ファイバ２同士の融着はあくまで微弱の接合である。本発明では、光ファイバ２同士の接合は上述した圧着工程で既に完全に行われている。したがって、端末金具１からはみ出ている光ファイバ２の切断は、加熱されていない切断具によって行ってもよい。 In the cutting step, as shown in FIG. 8, the heat knife 6 is moved along the end surface of the terminal fitting 1 to cut the optical fiber 2 protruding from the terminal fitting 1. At this time, the optical fibers 2 are weakly fused to each other by the heat of the heat knife 6 and joined to each other. The fusion of the optical fibers 2 with the heat knife 6 is only a weak bond. In the present invention, the bonding between the optical fibers 2 has already been completely performed by the crimping step described above. Therefore, the optical fiber 2 protruding from the terminal fitting 1 may be cut by an unheated cutting tool.

以上のような工程を経ることで、図９に示すような端末金具付き光ファイバ７を得ることができる。この端末金具付き光ファイバ７は、端部に位置する端末金具１と、この端末金具に一方の端部が固定された複数本の光ファイバ２とからなる。なお、上記工程は光ファイバ２の他方の端部に施してもよい。すなわち、端末金具１は光ファイバ２の両端に形成してもよい。以上により、本発明によれば、簡単且つ迅速に、そして効率よく端末金具１に対して強固に光ファイバ２を固定することができる。 By going through the above steps, the optical fiber 7 with a terminal fitting as shown in FIG. 9 can be obtained. The optical fiber 7 with a terminal fitting includes a terminal fitting 1 located at an end portion and a plurality of optical fibers 2 having one end fixed to the terminal fitting. The above step may be applied to the other end of the optical fiber 2. That is, the terminal fitting 1 may be formed at both ends of the optical fiber 2. As described above, according to the present invention, the optical fiber 2 can be firmly and firmly fixed to the terminal fitting 1 easily, quickly, and efficiently.

一方で、光ファイバ２として有機系のプラスチックファイバを用いてもよい。このように、光ファイバ２としてプラスチックファイバを用いることで、圧着工程での圧着性能が向上し、さらに切断工程での融着性能を向上させることができる。 On the other hand, an organic plastic fiber may be used as the optical fiber 2. As described above, by using the plastic fiber as the optical fiber 2, the crimping performance in the crimping process can be improved, and the fusion performance in the cutting step can be further improved.

図１０に示すように、本発明に係る端末金具付き光ファイバの製造方法では、光ファイバ２が１本であっても適用可能である。この場合は挿通工程にて１本の光ファイバ２を端末金具１に挿通することになる。そして圧着工程にて圧縮部８を形成し、光ファイバ２の外表面も圧縮部８の外表面と同様の形状になるように外圧をかける。これにより、上述した複数本の光ファイバ２を束ねたバンドルファイバと同様、強固に端末金具１に固定された光ファイバ２を得ることができる。このように圧着工程を経ても、光ファイバ２のコア９までその外圧が作用することはない。このことは、上記のような光ファイバ２が複数本のバンドルファイバでも同様である。このように１本の光ファイバ２のみで用いられる用途もバンドルファイバとともに需要があるため、本発明はこのような双方に適用でき、好ましいといえる。１本の光ファイバ２で形成された端末金具付き光ファイバ７は、ＰＯＦとして、例えばテレビや自動車等に適用される。なお、コア９は鞘材１０に覆われて光ファイバ２を形成している。 As shown in FIG. 10, in the method for manufacturing an optical fiber with a terminal fitting according to the present invention, even if there is only one optical fiber 2, it can be applied. In this case, one optical fiber 2 is inserted into the terminal fitting 1 in the insertion step. Then, the compression portion 8 is formed in the crimping step, and external pressure is applied to the outer surface of the optical fiber 2 so as to have the same shape as the outer surface of the compression portion 8. As a result, it is possible to obtain an optical fiber 2 firmly fixed to the terminal fitting 1 as in the case of the bundle fiber in which a plurality of optical fibers 2 are bundled as described above. Even after undergoing the crimping step in this way, the external pressure does not act on the core 9 of the optical fiber 2. This also applies to a bundle fiber having a plurality of optical fibers 2 as described above. Since there is a demand for the use of only one optical fiber 2 together with the bundle fiber, the present invention can be applied to both of them and can be said to be preferable. The optical fiber 7 with a terminal fitting formed of one optical fiber 2 is applied as a POF to, for example, a television or an automobile. The core 9 is covered with the sheath material 10 to form the optical fiber 2.

実際に、以下のような条件で本発明に係る端末金具付き光ファイバの製造方法を行った。コア９がポリメタクリル酸メチル樹脂で鞘材１０がフッ素化重合体である直径０．２５ｍｍの側面発光型光ファイバ２を８７本、同長さで用意し、これをまとめて束とした。そして、内径Φ２．７、外径Φ５からなるアルミ製の端末金具１を用意し、上述した束の一方の端部を通し、挿通工程を行った。そして、対辺４．５２ｍｍの六角圧着工具にて端末金具１に対して外圧をかけ、圧着工程を行った。そして、５００℃に加熱されたヒートナイフ６を用いて切断工程を行った。これらの工程を上述した束の他方の端部にも行った。このようにして得られたバンドルファイバは、効率よく側面発光がなされていることが確認された。 Actually, the method for manufacturing an optical fiber with a terminal fitting according to the present invention was carried out under the following conditions. 87 side-emitting optical fibers 2 having a diameter of 0.25 mm and a core 9 made of polymethyl methacrylate resin and a sheath material 10 made of a fluorinated polymer were prepared in the same length, and these were bundled together. Then, an aluminum terminal fitting 1 having an inner diameter of Φ2.7 and an outer diameter of Φ5 was prepared, and the insertion step was performed through one end of the bundle described above. Then, an external pressure was applied to the terminal fitting 1 with a hexagonal crimping tool having an opposite side of 4.52 mm to perform a crimping process. Then, a cutting step was performed using a heat knife 6 heated to 500 ° C. These steps were also performed on the other end of the bundle described above. It was confirmed that the bundle fiber thus obtained efficiently emits light from the side.

１：端末金具、２：光ファイバ、３：貫通孔、４：端末金具の内壁面、５：端末金具の外表面、６：ヒートナイフ、７：端末金具付き光ファイバ、８：圧縮部、９：コア、１０：鞘材 1: Terminal metal fittings, 2: Optical fibers, 3: Through holes, 4: Inner wall surface of terminal metal fittings, 5: Outer surface of terminal metal fittings, 6: Heat knife, 7: Optical fiber with terminal metal fittings, 8: Compressor, 9 : Core, 10: Sheath material

Claims (10)

光ファイバと、
前記光ファイバの一方の端部が挿通される筒状の端末金具であって、内壁面が圧縮されてなり、該内壁面が、前記光ファイバの前記端部のうち、該光ファイバの端面側の外周に密着している圧縮部を有する端末金具と、
を備え、
前記圧縮部は、横断面視における外表面の外縁が、周方向に沿って、直線部と、前記圧縮部以外の部分の外周の形状を維持して前記光ファイバの挿通方向に延びる曲線部とを繰り返す環状をなす
ことを特徴とする端末金具付き光ファイバ体。 With optical fiber
A tubular terminal fitting through which one end of the optical fiber is inserted, the inner wall surface is compressed, and the inner wall surface is the end face side of the optical fiber among the end portions of the optical fiber. A terminal fitting having a compression part that is in close contact with the outer circumference of the
With
The compression portion includes a straight portion along the circumferential direction and a curved portion in which the outer edge of the outer surface in cross-sectional view extends in the insertion direction of the optical fiber while maintaining the shape of the outer periphery of the portion other than the compression portion. An optical fiber body with terminal fittings, which is characterized by forming an annular shape that repeats. 前記光ファイバは、プラスチックファイバである
ことを特徴とする請求項１に記載の端末金具付き光ファイバ体。 The optical fiber body with a terminal fitting according to claim 1, wherein the optical fiber is a plastic fiber. 複数の前記光ファイバを有し、
前記圧縮部は、束にした複数の前記光ファイバの端面側の外周に密着する
ことを特徴とする請求項１又は２に記載の端末金具付き光ファイバ体。 Having a plurality of the above-mentioned optical fibers,
The optical fiber body with a terminal fitting according to claim 1 or 2, wherein the compression portion is in close contact with the outer periphery of a plurality of bundled optical fibers on the end face side. 前記圧縮部は、内壁面が横断面視において多角形状をなす
ことを特徴とする請求項１〜３のいずれか一つに記載の端末金具付き光ファイバ体。 The optical fiber body with a terminal fitting according to any one of claims 1 to 3, wherein the compression portion has a polygonal shape in a cross-sectional view. 複数の前記光ファイバを有し、
束にした複数の前記光ファイバのうち中央部に位置する前記光ファイバの前記端面の形状が、六角形状をなす
ことを特徴とする請求項１〜３のいずれか一つに記載の端末金具付き光ファイバ体。 Having a plurality of the above-mentioned optical fibers,
The terminal fitting according to any one of claims 1 to 3, wherein the shape of the end face of the optical fiber located in the central portion of the plurality of bundled optical fibers has a hexagonal shape. Optical fiber body. 筒状の端末金具に対して光ファイバを挿通する挿通工程と、
前記端末金具に対して周方向から外圧を加えて該端末金具の一部に圧縮部を形成する圧着工程であって、横断面視における外表面の外縁が周方向に沿って、直線部と、前記圧縮部以外の部分の外周の形状を維持して前記光ファイバの挿通方向に延びる曲線部とを繰り返す環状をなす圧縮部を形成して、該圧縮部によって前記光ファイバを前記端末金具内で圧着させて固定する圧着工程と、
前記端末金具の一方の端部からはみ出ている前記光ファイバを切断具により切断する切断工程と、
を備えたことを特徴とする端末金具付き光ファイバ体の製造方法。 The insertion process of inserting an optical fiber into a tubular terminal fitting and
This is a crimping step in which an external pressure is applied to the terminal fitting from the circumferential direction to form a compression portion in a part of the terminal fitting, and the outer edge of the outer surface in a cross-sectional view is a straight portion along the circumferential direction. An annular compression portion is formed by maintaining the shape of the outer periphery of the portion other than the compression portion and repeating the curved portion extending in the insertion direction of the optical fiber, and the compression portion allows the optical fiber to be inserted into the terminal fitting. The crimping process of crimping and fixing, and
A cutting step of cutting the optical fiber protruding from one end of the terminal fitting with a cutting tool.
A method for manufacturing an optical fiber body with a terminal fitting, which is characterized by being provided with. 前記光ファイバは、プラスチックファイバであることを特徴とする請求項６に記載の端末金具付き光ファイバ体の製造方法。 The method for manufacturing an optical fiber body with a terminal fitting according to claim 6, wherein the optical fiber is a plastic fiber. 前記圧着工程にて、前記端末金具の内壁面が横断面視において多角形状となるように外圧を加えることを特徴とする請求項６又は７に記載の端末金具付き光ファイバ体の製造方法。 The method for manufacturing an optical fiber body with a terminal fitting according to claim 6 or 7, wherein in the crimping step, an external pressure is applied so that the inner wall surface of the terminal fitting has a polygonal shape in a cross-sectional view. 複数の前記光ファイバを有し、
前記圧着工程にて、前記光ファイバの外表面が六角形状となるように外圧を加えることを特徴とする請求項８に記載の端末金具付き光ファイバ体の製造方法。 Having a plurality of the above-mentioned optical fibers,
The method for manufacturing an optical fiber body with a terminal fitting according to claim 8, wherein an external pressure is applied so that the outer surface of the optical fiber has a hexagonal shape in the crimping step. 前記切断工程にて、加熱した前記切断具により前記光ファイバを切断することを特徴とする請求項６〜９のいずれか一つに記載の端末金具付き光ファイバ体の製造方法。 The method for manufacturing an optical fiber body with a terminal fitting according to any one of claims 6 to 9, wherein the optical fiber is cut by the heating tool in the cutting step.
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