JP2011059034A - Optical core wire discrimination device - Google Patents

Optical core wire discrimination device Download PDF

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JP2011059034A
JP2011059034A JP2009211341A JP2009211341A JP2011059034A JP 2011059034 A JP2011059034 A JP 2011059034A JP 2009211341 A JP2009211341 A JP 2009211341A JP 2009211341 A JP2009211341 A JP 2009211341A JP 2011059034 A JP2011059034 A JP 2011059034A
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optical fiber
light receiving
head
optical
receiving element
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Tetsuya Noda
哲也 野田
Toshihiko Honma
敏彦 本間
Kensuke Ito
謙輔 伊藤
Masataka Ishizuka
将孝 石塚
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical core wire discrimination device capable of maintaining excellent core wire discrimination characteristics, without replacing a head with respect to a plurality of optical fibers having each different coating diameter. <P>SOLUTION: This optical core wire discrimination device includes an optical core wire discrimination head 4 on which a bent part 41 for leaking a light signal by bending partially an optical fiber 9 is formed, and a body part provided with the optical core wire discrimination head 4. The body part includes: a light receiving element holding part 8 on which a recessed part 81 to be fitted to the bent part 41 of the optical core wire discrimination head 4 is formed, for holding two light receiving elements 82 oppositely to the bent part 41 along the recessed part 81; and an operation lever for moving the light receiving element holding part 8 relatively to the body part. The optical core wire discrimination head 4 includes a movable means 42 for moving the bent part 41 corresponding to the coating diameter of the optical fiber 9 clamped between the optical core wire discrimination head 4 and the light receiving element holding part 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、通信ケーブル等に利用される光ファイバの心線判別機能を備えた光心線判別装置に関する。   The present invention relates to an optical fiber discriminating device having a function of discriminating an optical fiber used for a communication cable or the like.

近年、ＦＴＴＨ(Fiber To The Home)が本格的に導入され、光ファイバネットワークが家庭にまで普及してきている。このＦＴＴＨの工事、保守作業においては、光心線判別装置による心線判別、システム光測定、光損失測定などの作業が必要とされる。   In recent years, FTTH (Fiber To The Home) has been introduced in earnest, and an optical fiber network has spread to homes. In the construction and maintenance work of this FTTH, work such as core line discrimination, system light measurement, and optical loss measurement by an optical core line discrimination device is required.

光ファイバの心線判別は、通常、光ファイバの一方の端部から特定の光信号（例えば、２７０Ｈｚの周波数に変調された光信号）を送出し、他方の端部側で受光素子により受光検出し、検出回路により判別を行なう。このような光心線判別を行う装置の中には、光ファイバの光パワーを測定する機能を備えたものもある。   For optical fiber core discrimination, a specific optical signal (for example, an optical signal modulated to a frequency of 270 Hz) is usually sent from one end of the optical fiber, and light reception is detected by the light receiving element at the other end. Then, the determination is made by the detection circuit. Some apparatuses for discriminating such an optical fiber have a function of measuring the optical power of the optical fiber.

例えば、特許文献１には、光ファイバから光信号を漏洩させるための湾曲部が形成された光心線判別用ヘッドと、光ファイバを着脱可能に装着するレセプタ部を設けた光パワー測定用ヘッドと、いずれかのヘッドを着脱可能に装着する本体部とを備えた光心線判別装置が記載されている。この光心線判別装置によれば、受光素子を３つ用いて光ファイバにおける心線判別機能及び光パワー測定機能を１つの装置で実現するようにしている。   For example, Patent Document 1 discloses an optical power measurement head provided with an optical fiber identification head formed with a curved portion for leaking an optical signal from an optical fiber, and a receptor portion on which the optical fiber is detachably mounted. And an optical fiber discriminating device including a main body portion on which any one of the heads is detachably mounted. According to this optical core discriminating device, the core disc discriminating function and the optical power measuring function in the optical fiber are realized by one device using three light receiving elements.

上記のような光心線判別装置により心線判別の対象となる光ファイバは、例えば、外径０.２５ｍｍ／０.５ｍｍの単心線や、２心〜１２心のテープ心線、外径１.１ｍｍ〜３.０ｍｍの光コードなど、複数種類存在するが、従来の光心線判別装置では、光ファイバの被覆径によらず、同じヘッドを用いていたため、全ての光ファイバの被覆径に対して良好な心線判別特性を維持することは難しかった。   The optical fiber which is the object of the optical fiber discrimination by the optical fiber discriminating apparatus as described above is, for example, a single fiber with an outer diameter of 0.25 mm / 0.5 mm, a tape fiber with 2 to 12 fibers, an outer diameter. There are a plurality of types of optical cords such as 1.1 mm to 3.0 mm, but the conventional optical core discriminating apparatus uses the same head regardless of the coating diameter of the optical fiber. However, it was difficult to maintain good core discrimination characteristics.

図６は、従来の光心線判別装置における光心線判別ヘッドと受光素子との配置関係について説明するための図である。図６（Ａ）は光心線判別ヘッドと受光素子との配置関係を模式的に示した図、図６（Ｂ）は図６（Ａ）のＸＸ断面を示す図である。図中、１００は光心線判別ヘッド、２００は光心線判別装置本体側の受光素子保持部、３００は光ファイバを示す。   FIG. 6 is a diagram for explaining the positional relationship between the optical fiber identification head and the light receiving element in the conventional optical fiber identification device. FIG. 6A is a diagram schematically showing the positional relationship between the optical core discriminating head and the light receiving element, and FIG. In the figure, 100 is an optical fiber identification head, 200 is a light receiving element holding part on the optical fiber identification device main body side, and 300 is an optical fiber.

光心線判別ヘッド１００には、光ファイバ３００を部分的に曲げて光信号を漏洩させるための湾曲部１０１が形成されている。湾曲部１０１は、第１部材１０１ａ、第２部材１０１ｂ、及び第３部材１０１ｃを備え、これらの部材により光ファイバ３００をセットするための溝が形成されている。受光素子保持部２００は、光心線判別ヘッド１００の湾曲部１０１に嵌合する凹部２０１が形成され且つ凹部２０１に沿って湾曲部１０１に対向するように２つの受光素子２０２を保持する。   The optical fiber identification head 100 is formed with a bending portion 101 for partially bending the optical fiber 300 to leak an optical signal. The bending portion 101 includes a first member 101a, a second member 101b, and a third member 101c, and a groove for setting the optical fiber 300 is formed by these members. The light receiving element holding unit 200 holds the two light receiving elements 202 so that a concave portion 201 that fits into the curved portion 101 of the optical fiber determination head 100 is formed and faces the curved portion 101 along the concave portion 201.

従来の光心線判別ヘッド１００は、例えば、湾曲部１０１を構成する第１部材１０１ａが第２部材１０１ｂよりも距離ｌ（０.５ｍｍ）だけ突出して形成されている。これによれば、外径０.２５ｍｍ／０.５ｍｍの単心線について心線判別を適切に行うことができる。すなわち、距離ｌ（０.５ｍｍ）の溝に対して、外径０.２５ｍｍまたは０.５ｍｍの光ファイバ３００が配置されるため、この溝内に、光ファイバ３００が収まり、光ファイバ３００と受光素子２０２とを適切な位置に配置することができる。   In the conventional optical fiber identification head 100, for example, the first member 101a constituting the bending portion 101 is formed to protrude from the second member 101b by a distance l (0.5 mm). According to this, it is possible to appropriately determine the core wire for a single core wire having an outer diameter of 0.25 mm / 0.5 mm. That is, since the optical fiber 300 having an outer diameter of 0.25 mm or 0.5 mm is disposed in the groove having the distance l (0.5 mm), the optical fiber 300 is accommodated in the groove, and the optical fiber 300 and the light receiving member are received. The element 202 can be placed at an appropriate position.

しかしながら、この光心線判別ヘッド１００に、例えば、外径３.０ｍｍの光ファイバ３００をセットする場合、上記溝（距離ｌ＝０.５ｍｍ）内に、光ファイバ３００を収めることができないため、光ファイバ３００と受光素子２０２とを適切な位置に配置することができない。このため良好な心線判別特性を得ることができない。   However, for example, when an optical fiber 300 having an outer diameter of 3.0 mm is set in the optical fiber identification head 100, the optical fiber 300 cannot be accommodated in the groove (distance l = 0.5 mm). The optical fiber 300 and the light receiving element 202 cannot be disposed at appropriate positions. For this reason, a good core line discrimination characteristic cannot be obtained.

これに対して、全ての光ファイバの被覆径に対して良好な心線判別特性を維持するために、光ファイバの被覆径毎に複数の光心線判別ヘッドを予め準備しておき、作業者が測定する光ファイバの被覆径に応じて光心線判別ヘッドを交換する方法が知られている。   On the other hand, in order to maintain good core discrimination characteristics for all optical fiber coating diameters, a plurality of optical core discrimination heads are prepared in advance for each optical fiber coating diameter. There is known a method of exchanging the optical fiber identification head according to the coating diameter of the optical fiber to be measured.

特開２００５−２１４６６３号公報JP 2005-214663 A

しかしながら、上記の方法では、作業者が光ファイバの被覆径に応じて光心線判別用ヘッドを毎回交換する必要があるため手間がかかるという問題がある。また、心線判別作業はクロージャなどの狭い空間で行われるため、交換の際に間違ったヘッドを装着してしまうなどの作業ミスが発生し易いといった問題もある。   However, the above method has a problem that it takes time because the operator needs to replace the optical fiber core discrimination head every time according to the coating diameter of the optical fiber. Further, since the core wire discrimination work is performed in a narrow space such as a closure, there is a problem that a work mistake such as mounting a wrong head during replacement is likely to occur.

本発明は、上述のような実情に鑑みてなされたもので、被覆径の異なる複数の光ファイバに対して、ヘッドを交換することなく、良好な心線判別特性を維持できるようにした光心線判別装置を提供すること、を目的とする。   The present invention has been made in view of the above circumstances, and an optical core capable of maintaining good core-line discrimination characteristics without replacing the head for a plurality of optical fibers having different coating diameters. An object of the present invention is to provide a line discrimination device.

本発明による光心線判別装置は、光ファイバを部分的に曲げて光信号を漏洩させるための湾曲部が形成された光心線判別ヘッドと、光心線判別ヘッドが設けられた本体部とを備える。本体部は、光心線判別ヘッドの湾曲部に嵌合する凹部が形成され且つ凹部に沿って湾曲部に対向するように第１の受光素子及び第２の受光素子を保持する受光素子保持手段と、受光素子保持手段を本体部に対して相対移動させる移動手段とを備え、光心線判別ヘッドは、光心線判別ヘッドと受光素子保持手段との間で挟持される光ファイバの被覆径に応じて湾曲部を可動させる可動手段を備える。   An optical core discriminating apparatus according to the present invention includes an optical core discriminating head formed with a curved portion for partially bending an optical fiber to leak an optical signal, and a main body portion provided with the optical core disc discriminating head. Is provided. The main body includes a light receiving element holding unit configured to hold a first light receiving element and a second light receiving element so that a concave portion that fits into the curved portion of the optical fiber identification head is formed and faces the curved portion along the concave portion. And a moving means for moving the light receiving element holding means relative to the main body, and the optical fiber identification head has a coating diameter of an optical fiber that is sandwiched between the optical fiber identification head and the light receiving element holding means. And a movable means for moving the bending portion according to the above.

また、可動手段は、光ファイバの被覆径に応じて伸縮する弾性部材であることが望ましい。
また、光心線判別ヘッドの湾曲部は、断面コの字状に形成されていることが望ましい。
また、光心線判別ヘッドに光ファイバがセットされた状態で、光心線判別ヘッドに対して受光素子保持手段を移動させ、第１の受光素子及び第２の受光素子を湾曲部に対向させることが望ましい。 The movable means is preferably an elastic member that expands and contracts according to the coating diameter of the optical fiber.
Further, it is desirable that the curved portion of the optical fiber identification head is formed in a U-shaped cross section.
Further, in a state where the optical fiber is set in the optical fiber identification head, the light receiving element holding means is moved relative to the optical fiber identification head, and the first light receiving element and the second light receiving element are opposed to the curved portion. It is desirable.

本発明によれば、光ファイバの被覆径に応じてヘッド内部の湾曲部を可動させることにより、被覆径の異なる複数の光ファイバに対して、ヘッドを交換することなく、良好な心線判別特性を維持することができ、さらに、ヘッド交換時の作業ミスを防止することができる。   According to the present invention, by moving the curved portion inside the head according to the coating diameter of the optical fiber, it is possible to obtain a good core discrimination characteristic without replacing the head for a plurality of optical fibers having different coating diameters. In addition, it is possible to prevent mistakes during head replacement.

本発明による光心線判別装置の外観の一例を示す図である。It is a figure which shows an example of the external appearance of the optical fiber identification apparatus by this invention. 本発明による光心線判別装置の外観の一例を示す図である。It is a figure which shows an example of the external appearance of the optical fiber identification apparatus by this invention. 光心線判別ヘッドを含む要部構成を模式的に示した図である。It is the figure which showed typically the principal part structure containing an optical-core wire discrimination | determination head. 図３（Ｂ）に示す第２部材の構造を示す図である。It is a figure which shows the structure of the 2nd member shown in FIG.3 (B). 本発明の光心線判別装置による光ファイバのセット方法の一例を説明するための図である。It is a figure for demonstrating an example of the setting method of the optical fiber by the optical fiber identification device of this invention. 従来の光心線判別装置における光心線判別ヘッドと受光素子との配置関係について説明するための図である。It is a figure for demonstrating the arrangement | positioning relationship between the optical-core determination head and the light receiving element in the conventional optical-core determination apparatus.

以下、添付図面を参照しながら、本発明の光心線判別装置に係る好適な実施の形態について説明する。なお、各図において、同じ構成要素には同じ符号を付し、繰り返しの説明は省略するものとする。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments according to an optical fiber identification device of the invention will be described with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals, and repeated description will be omitted.

図１及び図２は、本発明による光心線判別装置の外観の一例を示す図である。図１（Ａ）は光心線判別装置を上から見た図、図１（Ｂ）は光心線判別装置を横から見た図である。また、図２（Ａ）は光心線判別ヘッドを取り外した状態の光心線判別装置の要部を示す図、図２（Ｂ）は光心線判別ヘッドを示す図、図２（Ｃ）は光心線判別ヘッドを取り付けた状態の光心線判別装置の要部を示す図である。   1 and 2 are views showing an example of the appearance of the optical fiber identification device according to the present invention. FIG. 1A is a diagram of the optical fiber core discriminating device viewed from above, and FIG. 1B is a diagram of the optical fiber core discriminating device viewed from the side. FIG. 2A is a view showing a main part of the optical core discriminating apparatus with the optical core discriminating head removed, FIG. 2B is a diagram showing the optical core discriminating head, and FIG. These are figures which show the principal part of the optical-core-line discriminating device of the state which attached the optical-core-line discrimination head.

図１，図２において、１は本体部、２は本発明の移動手段に相当する操作レバー、３はＬＣＤ(Liquid Crystal Display)などの表示部、４は光心線判別ヘッド、５は光パワー測定アダプタ、６は遮光板、７はヘッド取付部、８は本発明の受光素子保持手段に相当する受光素子保持部を示す。この受光素子保持部８は、遮光板６の下側に配置され、遮光板６と一体的に構成されている。また、光心線判別ヘッド４は、本体部１に一体的に構成されていてもよいし、着脱可能に構成されていてもよい。   1 and 2, 1 is a main body, 2 is an operation lever corresponding to the moving means of the present invention, 3 is a display unit such as an LCD (Liquid Crystal Display), 4 is an optical core discriminating head, and 5 is optical power. A measurement adapter, 6 is a light shielding plate, 7 is a head mounting portion, and 8 is a light receiving element holding portion corresponding to the light receiving element holding means of the present invention. The light receiving element holding portion 8 is disposed below the light shielding plate 6 and is configured integrally with the light shielding plate 6. Further, the optical fiber identification head 4 may be configured integrally with the main body 1 or may be configured to be detachable.

上記の光心線判別装置は、本体部１のヘッド取付部７に光心線判別ヘッド４が取り付けられると共に、この光心線判別ヘッド４の反対側に光パワー測定アダプタ５が設けられている。光パワー測定アダプタ５は、光損失のレベル及びシステム光のレベルを測定するためのもので、本体部１に一体的に構成されている。なお、本発明に係る光心線判別装置は、光心線判別ヘッド４を備えていればよく、光パワー測定アダプタ５を備えていなくてもよい。   In the above optical fiber identification device, the optical fiber identification head 4 is attached to the head attachment portion 7 of the main body 1, and the optical power measurement adapter 5 is provided on the opposite side of the optical fiber identification head 4. . The optical power measurement adapter 5 is used to measure the level of optical loss and the level of system light, and is configured integrally with the main body 1. Note that the optical fiber identification device according to the present invention only needs to include the optical fiber identification head 4 and does not need to include the optical power measurement adapter 5.

光心線判別ヘッド４は、光ファイバ（図示せず）を部分的に曲げて光信号を漏洩させるための湾曲部４１が形成されている。また、受光素子保持部８は、光心線判別ヘッド４の湾曲部４１に嵌合する凹部８１が形成され且つ凹部８１に沿って湾曲部４１に対向するように２つの受光素子８２（第１の受光素子及び第２の受光素子）を保持する。この２つの受光素子８２としては、例えば、ＰＤ(Photo Diode)が用いられる。操作レバー２は、受光素子保持部８を本体部１に対して相対移動させる。なお、遮光板６は受光素子保持部８に一体的に設けられており、操作レバー２の移動操作により、受光素子保持部８と共に移動する。   The optical fiber identification head 4 is formed with a bending portion 41 for partially bending an optical fiber (not shown) to leak an optical signal. Further, the light receiving element holding portion 8 has two light receiving elements 82 (the first light receiving elements 82 so that a concave portion 81 that fits into the curved portion 41 of the optical fiber determination head 4 is formed and faces the curved portion 41 along the concave portion 81. The light receiving element and the second light receiving element). For example, a PD (Photo Diode) is used as the two light receiving elements 82. The operating lever 2 moves the light receiving element holding portion 8 relative to the main body portion 1. The light shielding plate 6 is provided integrally with the light receiving element holding portion 8, and moves together with the light receiving element holding portion 8 when the operation lever 2 is moved.

上記の光心線判別装置により心線判別を行うときの動作手順について図１に基づき簡単に説明する。まず、心線判別を行う光ファイバ（図示せず）を光心線判別ヘッド４の湾曲部４１の所定位置にセットする。そして、操作レバー２を前方（図１の矢印の方向）にスライド操作して、受光素子保持部８及び遮光板６を本体部１に対して相対移動させて、２つの受光素子８２が湾曲部４１に近接・対向した状態で停止させ、動作状態にする。このときの状態について後述の図３に示す。   An operation procedure when the optical fiber is discriminated by the optical fiber discriminating device will be briefly described with reference to FIG. First, an optical fiber (not shown) for discriminating the core wire is set at a predetermined position of the bending portion 41 of the optical core discriminating head 4. Then, the operation lever 2 is slid forward (in the direction of the arrow in FIG. 1) to move the light receiving element holding portion 8 and the light shielding plate 6 relative to the main body portion 1 so that the two light receiving elements 82 are curved. It stops in the state which adjoins and opposes 41, and makes it an operation state. The state at this time is shown in FIG.

上記の動作状態において外部光は遮光板６によって遮光され、光心線判別ヘッド４の湾曲部４１によって曲げが付与された光ファイバからの漏洩光を２つの受光素子８２により検出する。そして、２つの受光素子８２により検出された漏洩光は、本体部１に設けられた検出回路により増幅、判別され、その結果は表示部３に表示される。   In the above operating state, the external light is shielded by the light shielding plate 6, and leakage light from the optical fiber bent by the bending portion 41 of the optical core discriminating head 4 is detected by the two light receiving elements 82. The leaked light detected by the two light receiving elements 82 is amplified and discriminated by a detection circuit provided in the main body 1, and the result is displayed on the display 3.

ここで、本発明に係る光心線判別ヘッド４は、光心線判別ヘッド４と受光素子保持部８との間で挟持される光ファイバの被覆径に応じて湾曲部４１を可動させる可動手段を備えている。この可動手段の具体的な構成については図３〜図５に基づいて説明するが、このようにヘッドの湾曲部を可動構造にすることで、被覆径の異なる複数の光ファイバに対して、ヘッドを交換することなく、良好な心線判別特性を維持することができる。   Here, the optical fiber identification head 4 according to the present invention is a movable means for moving the bending portion 41 according to the coating diameter of the optical fiber sandwiched between the optical fiber identification head 4 and the light receiving element holding portion 8. It has. The specific configuration of the movable means will be described with reference to FIGS. 3 to 5. By making the curved portion of the head movable as described above, the head can be used for a plurality of optical fibers having different coating diameters. Good core line discrimination characteristics can be maintained without exchanging.

図３は、光心線判別ヘッド４を含む要部構成を模式的に示した図である。本例は、受光素子保持部８を本体部１に対して相対移動させて、２つの受光素子８２が湾曲部４１に近接・対向した状態について示したものであるが、遮光板６の記載は省略している。光心線判別ヘッド４は、図３（Ａ），図３（Ｃ）に示すように、光ファイバ９の被覆径に応じて湾曲部４１を可動させる可動手段の一例である弾性部材４２を備える。   FIG. 3 is a diagram schematically showing the configuration of the main part including the optical fiber identification head 4. In this example, the light receiving element holding portion 8 is moved relative to the main body portion 1 so that the two light receiving elements 82 are close to and opposed to the bending portion 41. Omitted. As shown in FIGS. 3A and 3C, the optical fiber identification head 4 includes an elastic member 42 that is an example of a movable unit that moves the bending portion 41 according to the coating diameter of the optical fiber 9. .

この弾性部材４２は、例えば、バネやゴムなどであり、光ファイバ９の被覆径に応じて伸縮するため、被覆径の比較的細い光ファイバ９の場合、図３（Ａ）に示すように弾性部材４２が伸びた状態となり、一方、被覆径の比較的太い光ファイバ９の場合、図３（Ｃ）に示すように弾性部材４２が縮んだ状態となる。   The elastic member 42 is, for example, a spring or rubber, and expands and contracts in accordance with the coating diameter of the optical fiber 9. On the other hand, in the case of the optical fiber 9 having a relatively large coating diameter, the elastic member 42 is contracted as shown in FIG.

また、図３（Ｂ）は、図３（Ａ）に示す光心線判別ヘッド４及び受光素子保持部８のＹＹ断面を示す図である。なお、ここでは弾性部材４２の記載を省略している。湾曲部４１は、第１部材４１ａ、第２部材４１ｂ、及び第３部材４１ｃで構成され、これらの部材により光ファイバ９をセットするための溝が形成されている。また、湾曲部４１の第２部材４１ｂは弾性部材４２により受光素子保持部８の方向に付勢されている。図３（Ｂ）に示す第２部材４１ｂの外観構成を図４に示す。このように、第２部材４１ｂは弾性部材４２の伸縮により図中矢印の方向に移動可能に保持されている。   FIG. 3B is a diagram showing a YY cross section of the optical core determination head 4 and the light receiving element holding portion 8 shown in FIG. Here, the description of the elastic member 42 is omitted. The bending portion 41 includes a first member 41a, a second member 41b, and a third member 41c, and a groove for setting the optical fiber 9 is formed by these members. Further, the second member 41 b of the bending portion 41 is urged toward the light receiving element holding portion 8 by the elastic member 42. FIG. 4 shows an external configuration of the second member 41b shown in FIG. In this way, the second member 41b is held so as to be movable in the direction of the arrow in the figure by the expansion and contraction of the elastic member 42.

上記の図３（Ａ）に示す構成において、光心線判別ヘッド４は、例えば、湾曲部４１を構成する第１部材４１ａが第２部材４１ｂよりも距離ｌ（０.５ｍｍ）だけ突出して形成されている。これによれば、外径０.２５ｍｍ／０.５ｍｍの単心線について心線判別を適切に行うことができる。すなわち、距離ｌ（０.５ｍｍ）の溝に対して、外径０.２５ｍｍまたは０.５ｍｍの光ファイバ９が配置されるため、この溝内に、光ファイバ９が収まり、光ファイバ９と受光素子８２とを適切な位置に配置することができる。   In the configuration shown in FIG. 3A, the optical fiber identification head 4 is formed, for example, such that the first member 41a constituting the bending portion 41 protrudes from the second member 41b by a distance l (0.5 mm). Has been. According to this, it is possible to appropriately determine the core wire for a single core wire having an outer diameter of 0.25 mm / 0.5 mm. That is, since the optical fiber 9 having an outer diameter of 0.25 mm or 0.5 mm is disposed in the groove having the distance l (0.5 mm), the optical fiber 9 is accommodated in the groove, and the optical fiber 9 and the light receiving portion are received. The element 82 can be disposed at an appropriate position.

そして、図３（Ｃ）に示すように、この光心線判別ヘッド４に、例えば、外径３.０ｍｍの光ファイバ９をセットする場合、光ファイバ９の被覆径に応じて、上記溝の距離ｌ（０.５ｍｍ）が変化する。ここでは溝の距離ｌが長くなる。これにより、湾曲部４１の溝内に光ファイバ９が収まるため、光ファイバ９と受光素子８２とを適切な位置に配置することができる。   As shown in FIG. 3C, for example, when an optical fiber 9 having an outer diameter of 3.0 mm is set in the optical core determination head 4, the groove of the optical fiber 9 depends on the coating diameter of the optical fiber 9. The distance l (0.5 mm) changes. Here, the groove distance l becomes longer. Thereby, since the optical fiber 9 fits in the groove | channel of the curved part 41, the optical fiber 9 and the light receiving element 82 can be arrange | positioned in an appropriate position.

このように、光ファイバの被覆径に応じてヘッド内部の湾曲部を可動させることにより、被覆径の異なる複数の光ファイバに対して、ヘッドを交換することなく、良好な心線判別特性を維持することができ、さらに、ヘッド交換時の作業ミスを防止することができる。   In this way, by moving the curved part inside the head according to the coating diameter of the optical fiber, it is possible to maintain good core discrimination characteristics without replacing the head for a plurality of optical fibers having different coating diameters. In addition, it is possible to prevent work mistakes during head replacement.

また、図３（Ｂ）に示すように、光心線判別ヘッド４の湾曲部４１は、断面コの字状に形成されている。このため、例えば、１２心などの幅広のテープ心線であっても、光心線判別ヘッド４の溝内に簡単にセットすることができる。なお、第２部材４１ｂの厚み（すなわち、溝の幅）は例えば３.６ｍｍ程度である。   Further, as shown in FIG. 3B, the curved portion 41 of the optical fiber identification head 4 is formed in a U-shaped cross section. For this reason, for example, even a wide tape core such as 12 cores can be easily set in the groove of the optical core determination head 4. The thickness of the second member 41b (that is, the width of the groove) is, for example, about 3.6 mm.

図５は、本発明の光心線判別装置による光ファイバのセット方法の一例を説明するための図である。従来の光心線判別装置では、受光素子保持部側が固定され、光心線判別ヘッド側が移動するように構成されているため、動作状態にするときにヘッド側にセットされた光ファイバが引っ張られる形になり、光ファイバにテンションがかかる。このため光ファイバの破損等を引き起こす可能性があった。これに対して、本発明による光心線判別装置は、光ファイバがセットされたヘッドを固定とし、受光素子保持部側が移動する構成となっているため、動作状態にするときにヘッド側にセットされた光ファイバが引っ張られることがない。このため光ファイバ側にテンションがかかる心配がなく、光ファイバの破損等を起こし難くなる。   FIG. 5 is a diagram for explaining an example of an optical fiber setting method by the optical fiber identification device of the present invention. In the conventional optical fiber identification device, the light receiving element holding part side is fixed and the optical fiber identification head side is moved, so that the optical fiber set on the head side is pulled when the operation state is set. And the optical fiber is tensioned. For this reason, the optical fiber may be damaged. On the other hand, the optical fiber identification device according to the present invention has a configuration in which the head on which the optical fiber is set is fixed and the light receiving element holding part side is moved. The optical fiber is not pulled. For this reason, there is no fear that tension is applied to the optical fiber side, and the optical fiber is hardly damaged.

すなわち、図５（Ａ）に示すように、光ファイバ９を光心線判別ヘッド４の湾曲部４１にセットした後に、受光素子保持部８を図中矢印の方向に移動させる。そして、図５（Ｂ）に示すように、光ファイバ９と湾曲部４１との接点を中心として、光ファイバ９の両端に受光素子保持部８が最初に当接し、この光ファイバ９の両端を持ち上げる。そして、図５（Ｃ）に示すように、光ファイバ９の両端にテンションをかけながら受光素子保持部８を湾曲部４１に近接・対向させ、動作状態にする。   That is, as shown in FIG. 5A, after the optical fiber 9 is set on the bending portion 41 of the optical fiber identification head 4, the light receiving element holding portion 8 is moved in the direction of the arrow in the figure. Then, as shown in FIG. 5B, the light receiving element holding portion 8 is first brought into contact with both ends of the optical fiber 9 around the contact point between the optical fiber 9 and the bending portion 41, and both ends of the optical fiber 9 are lift. Then, as shown in FIG. 5C, the light receiving element holding portion 8 is brought close to and opposed to the bending portion 41 while applying tension to both ends of the optical fiber 9 to be in an operating state.

上記によれば、受光素子保持部８と光ファイバ９とを近接させる際に、光ファイバ９がセットされた光心線判別ヘッド４を固定し、受光素子保持部８を移動させることで、光ファイバ９を引っ張ることがないため、光ファイバ９側に大きなテンションをかける心配がなく、光ファイバの破損等を防止することができる。   According to the above, when the light receiving element holding unit 8 and the optical fiber 9 are brought close to each other, the optical core determination head 4 on which the optical fiber 9 is set is fixed, and the light receiving element holding unit 8 is moved to Since the fiber 9 is not pulled, there is no fear that a large tension is applied to the optical fiber 9 side, and breakage of the optical fiber can be prevented.

１…本体部、２…操作レバー、３…表示部、４…光心線判別ヘッド、５…光パワー測定アダプタ、６…遮光板、７…ヘッド取付部、８…受光素子保持部、９…光ファイバ、４１…湾曲部、４２…弾性部材、８１…凹部、８２…受光素子。 DESCRIPTION OF SYMBOLS 1 ... Main-body part, 2 ... Operation lever, 3 ... Display part, 4 ... Optical fiber identification head, 5 ... Optical power measuring adapter, 6 ... Light-shielding plate, 7 ... Head attaching part, 8 ... Light receiving element holding part, 9 ... Optical fiber 41... Curved portion 42. Elastic member 81. Recessed portion 82.

Claims (4)

光ファイバを部分的に曲げて光信号を漏洩させるための湾曲部が形成された光心線判別ヘッドと、該光心線判別ヘッドが設けられた本体部とを備えた光心線判別装置であって、
前記本体部は、前記光心線判別ヘッドの湾曲部に嵌合する凹部が形成され且つ該凹部に沿って前記湾曲部に対向するように第１の受光素子及び第２の受光素子を保持する受光素子保持手段と、該受光素子保持手段を前記本体部に対して相対移動させる移動手段とを備え、
前記光心線判別ヘッドは、該光心線判別ヘッドと前記受光素子保持手段との間で挟持される光ファイバの被覆径に応じて前記湾曲部を可動させる可動手段を備えたことを特徴とする光心線判別装置。 An optical core discriminating apparatus comprising an optical core discriminating head formed with a bending portion for partially bending an optical fiber to leak an optical signal, and a main body provided with the optical core disc discriminating head. There,
The main body portion has a first light receiving element and a second light receiving element that are formed with a concave portion that fits into the curved portion of the optical fiber identification head and faces the curved portion along the concave portion. A light receiving element holding means, and a moving means for moving the light receiving element holding means relative to the main body,
The optical fiber identification head comprises a moving means for moving the bending portion according to a coating diameter of an optical fiber sandwiched between the optical fiber identification head and the light receiving element holding means. Optical fiber core discrimination device. 前記可動手段は、前記光ファイバの被覆径に応じて伸縮する弾性部材であることを特徴とする請求項１に記載の光心線判別装置。   2. The optical fiber identification device according to claim 1, wherein the movable means is an elastic member that expands and contracts according to a coating diameter of the optical fiber. 前記光心線判別ヘッドの湾曲部は、断面コの字状に形成されていることを特徴とする請求項１又は２に記載の光心線判別装置。   The optical core discriminating apparatus according to claim 1 or 2, wherein the curved portion of the optical core discriminating head is formed in a U-shaped cross section. 前記光心線判別ヘッドに前記光ファイバがセットされた状態で、該光心線判別ヘッドに対して前記受光素子保持手段を移動させ、前記第１の受光素子及び前記第２の受光素子を前記湾曲部に対向させることを特徴とする請求項１〜３のいずれか１項に記載の光心線判別装置。   In a state where the optical fiber is set in the optical fiber identification head, the light receiving element holding means is moved with respect to the optical fiber identification head, and the first light receiving element and the second light receiving element are The optical fiber identification device according to any one of claims 1 to 3, wherein the optical fiber detection device is opposed to the curved portion.
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