JP3396091B2 - Manufacturing method of multi-core optical connector - Google Patents

Manufacturing method of multi-core optical connector

Info

Publication number
JP3396091B2
JP3396091B2 JP22098994A JP22098994A JP3396091B2 JP 3396091 B2 JP3396091 B2 JP 3396091B2 JP 22098994 A JP22098994 A JP 22098994A JP 22098994 A JP22098994 A JP 22098994A JP 3396091 B2 JP3396091 B2 JP 3396091B2
Authority
JP
Japan
Prior art keywords
ceramic sleeve
pin
molding
linear expansion
ferrule
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP22098994A
Other languages
Japanese (ja)
Other versions
JPH0862451A (en
Inventor
和宏 瀧澤
佳夫 菊地
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikura Ltd
Original Assignee
Fujikura Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP22098994A priority Critical patent/JP3396091B2/en
Publication of JPH0862451A publication Critical patent/JPH0862451A/en
Application granted granted Critical
Publication of JP3396091B2 publication Critical patent/JP3396091B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24Coupling light guides
    • G02B6/36Mechanical coupling means
    • G02B6/38Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807Dismountable connectors, i.e. comprising plugs
    • G02B6/3833Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3865Details of mounting fibres in ferrules; Assembly methods; Manufacture fabricated by using moulding techniques
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24Coupling light guides
    • G02B6/36Mechanical coupling means
    • G02B6/38Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807Dismountable connectors, i.e. comprising plugs
    • G02B6/3873Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
    • G02B6/3885Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type

Landscapes

  • Mechanical Coupling Of Light Guides (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Description

【発明の詳細な説明】 【0001】 【産業上の利用分野】この発明は、多心光ファイバ接続
用のMTコネクタ(後記参照)の製造方法に関し、特に
そのフェルールの製造方法に関するものである。 【0002】 【従来の技術】初めに、MT(Mechanically Transfera
ble)コネクタについて、簡単に説明する。図2に組立
て前の状態を模型的に示した。(a)は片方のフェルー
ルの斜視図、(b)は平面図、(c)は側面図である。
20はフェルールの全体を示す。その本体22はエポキ
シ樹脂などの精密成形品からなる(フジクラ技報84
号,p.58〜63参照)。本体22の両端に位置決め用のガ
イド穴24を設け、相手側コネクタとの精密位置決めを
するため、ここにガイドピン30を挿入する。両方のガ
イド穴24の中心を結ぶ基準線上の所定位置に、光ファ
イバ用の穴を設ける。そして、当該穴に光ファイバテー
プ心線10の光ファイバ12を通し、接着剤で固定す
る。その後、端面を研磨する。 【0003】接続の際は、片方のフェルールのガイド穴
24に長さの半分ほど差し込んでおいたガイドピン30
の先端を相手フェルールのガイド穴24に差し込み、か
つ両方のフェルールを突き合わせる。それから、図3の
ように、クランプスプリング32により一定の押し圧を
光ファイバ軸方向にかけ、安定した接続状態を確保す
る。 【0004】多心MTコネクタの接続損失を低減するた
めには、接続する光ファイバのコア同士の軸ずれを低減
する必要がある。そのためには、ガイド穴24を基準と
した光ファイバ用穴25を精度よく測定する必要がある
(図4)。そのため、図5のように、ガイド穴24をセ
ラミックスリーブ26でライニングする場合がある。 【0005】上記のガイド穴24をセラミックスリーブ
26でライニングしたフェルールの製造は、次のように
する。まず、使用する金型に付いて、簡単に説明する
(本発明に関係ない部分は省略した)。図6、図1
(a)にその一例を示す。なお、図1(a)は、図6の
V溝46,U溝54における断面でかつ中子41を省略
したものである。40は金型の全体である。42はその
下型で、キャビティ44,V溝46を有する。48は上
型で、トランスファポット50,キャビティ52,U溝
54を有する。26はセラミックスリーブで、56は成
形ピンである。 【0006】上記の金型40を用いて、次のようにイン
サート・トランスフア成形によりフェルールを製作す
る。すなわち、 予め成形ピン56を通しておいたセラミックスリー
ブ26を、金型40のV溝46とU溝54の間にセット
する(図1(b))。なお、セラミックスリーブ26と
成形ピン56間の常温時のクリアランスは、ほとんど無
い程度にしておく。たとえば、セラミックスリーブ26
の内径が0.6992mmのとき、成形ピン56の外径は0.6990
mmにする等である。このクリアランスが大きいと、セラ
ミックスリーブ位置すなわちガイド穴位置の不安定化等
の不都合が起き、その結果として光ファイバ用穴の位置
にずれが生じてコネクタ接続損が増大する。 金型40の温度を上昇させ、型締めを行う。 フェルール本体材料の樹脂22’(たとえばエポキ
シ樹脂)を金型40内に供給し、圧縮しながら熱硬化さ
せる。 その後、金型40の温度が下がらないうちに成形ピ
ン56を抜き(同図(c))、金型40を開いて成形品
(20)を取り出す(同図(d))。 次のセラミックスリーブ26に成形ピン56を通
す。 【0007】 【発明が解決しようとする課題】上記の方法により成形
したとき、セラミックスリーブ26に破壊が発生する場
合があった。また、連続成形の場合、成形ピン温度の常
温への低下を待つことなく、ある程度温度上昇した成形
ピン56をセラミックスリーブ26に挿入することにな
るが、このとき、成形ピン56の挿入が困難で、作業性
が悪かった。 【0008】 【課題を解決するための手段】上記の問題、特にセラミ
ックスリーブ26の破壊は、たとえばセラミックスリー
ブ26にジルコニア(線膨張係数:0.000009/℃)、成
形ピン56にSKH(線膨張係数:0.000011/℃)等を
用いた場合に発生することが分かった。すなわち、セラ
ミックスリーブ26の線膨張係数が、成形ピン56の線
膨張係数より小さい場合に、成形時の温度上昇による成
形ピン56の膨張圧力によって、セラミックスリーブが
破壊し、また挿入抵抗が大のため連続成形時の作業性が
低下したのである。そこで、セラミックスリーブの線膨
張係数が、成形ピンの線膨張係数に対して、ほぼ同じか
あるいは大きい関係にある材料を選定する。 【0009】 【作 用】セラミックスリーブの線膨張係数が、成形ピ
ンの線膨張係数とほぼ同じかあるいは大きいようにして
あると、 (1)セラミックスリーブ26と成形ピン56間の常温
時のクリアランスが、ほとんど無い程度にしてあって
も、成形時の温度上昇による成形ピン56の膨張圧力に
よってセラミックスリーブ26が破壊される恐れがな
い。 (2)温度がある程度上昇して外径が太くなった状態の
成形ピン56をセラミックスリーブ26に挿入する場合
も、セラミックスリーブ26の入口に成形ピン56を接
触させると、セラミックスリーブ26の温度上昇による
内径拡大が起き、成形ピン56を容易に挿入できるよう
になる。 (3)また、成形後の高温状態における成形ピン56の
引抜きも、容易に行える。 【0010】[課題解決手段のより詳しい説明]たとえ
ばセラミックスリーブ26にジルコニア(線膨張係数:
0.000009/℃)、成形ピン56に超硬合金(線膨張係
数:0.000005/℃)の組合せにする。セラミックスリー
ブ26と成形ピン56間の常温時のクリアランスは、ほ
とんど無い程度、すなわち、セラミックスリーブ26の
内径:0.6992mm、成形ピン56の外径:0.6990mm等にし
ておいてよい。 【0011】なお、セラミックスリーブ26の線膨張係
数が、フェルール本体22の樹脂の線膨張係数と大きく
違う場合は、コネクタの接続損失の温度特性が悪化す
る。したがって、この点も注意する必要がある。フェル
ール本体のエポキシ樹脂(線膨張係数:0.000015/℃)
とセラミックスリーブ26のジルコニア(線膨張係数:
0.000009/℃)程度の線膨張係数の違いならば、良い。 【0012】 【発明の効果】セラミックスリーブの線膨張係数が、成
形ピンの線膨張係数とほぼ同じかあるいは大きくしてあ
るので、 (1)成形時におけるセラミックスリーブの破壊が無く
なる。 (2)連続成形時のセラミックスリーブへの成形ピンの
挿入作業が容易になり、生産性が向上する。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an MT connector (see below) for connecting a multi-core optical fiber, and more particularly to a method for manufacturing a ferrule thereof. 2. Description of the Related Art First, MT (Mechanically Transfer
ble) The connector will be briefly described. FIG. 2 schematically shows a state before assembly. (A) is a perspective view of one ferrule, (b) is a plan view, and (c) is a side view.
Reference numeral 20 denotes the entire ferrule. The main body 22 is made of a precision molded product such as an epoxy resin (Fujikura Technical Report 84
No., pp. 58-63). Guide holes 24 for positioning are provided at both ends of the main body 22, and guide pins 30 are inserted into the guide holes 24 for precise positioning with a mating connector. A hole for an optical fiber is provided at a predetermined position on a reference line connecting the centers of both guide holes 24. Then, the optical fiber 12 of the optical fiber ribbon 10 is passed through the hole and fixed with an adhesive. Thereafter, the end face is polished. At the time of connection, a guide pin 30 inserted into the guide hole 24 of one of the ferrules by half its length is inserted.
Is inserted into the guide hole 24 of the other ferrule, and both ferrules are butted. Then, as shown in FIG. 3, a constant pressing force is applied in the axial direction of the optical fiber by the clamp spring 32 to secure a stable connection state. [0004] In order to reduce the connection loss of the multi-core MT connector, it is necessary to reduce the axial deviation between the cores of the optical fibers to be connected. For that purpose, it is necessary to accurately measure the optical fiber hole 25 based on the guide hole 24 (FIG. 4). Therefore, the guide hole 24 may be lined with a ceramic sleeve 26 as shown in FIG. A ferrule in which the guide hole 24 is lined with a ceramic sleeve 26 is manufactured as follows. First, a mold to be used will be briefly described (parts not related to the present invention are omitted). 6 and 1
(A) shows an example. FIG. 1A is a cross-sectional view of the V-groove 46 and the U-groove 54 in FIG. 6, and the core 41 is omitted. Numeral 40 denotes the whole mold. Reference numeral 42 denotes a lower mold having a cavity 44 and a V groove 46. An upper mold 48 has a transfer pot 50, a cavity 52, and a U-shaped groove 54. 26 is a ceramic sleeve and 56 is a molding pin. [0006] Using the above-described mold 40, a ferrule is manufactured by insert transfer molding as follows. That is, the ceramic sleeve 26 previously passed through the forming pin 56 is set between the V groove 46 and the U groove 54 of the mold 40 (FIG. 1B). In addition, the clearance between the ceramic sleeve 26 and the molding pin 56 at normal temperature is set to an almost zero level. For example, the ceramic sleeve 26
When the inner diameter of the molding pin is 0.6992 mm, the outer diameter of the forming pin 56 is 0.6990
mm. If the clearance is large, inconveniences such as instability of the position of the ceramic sleeve, that is, the position of the guide hole, occur, and as a result, the position of the hole for the optical fiber is shifted, and the connection loss of the connector increases. The temperature of the mold 40 is raised to perform mold clamping. The resin 22 '(for example, epoxy resin) of the ferrule body material is supplied into the mold 40, and is thermally cured while being compressed. Thereafter, the molding pin 56 is pulled out before the temperature of the mold 40 decreases (FIG. 3C), and the mold 40 is opened to take out the molded product (20) (FIG. 3D). The forming pin 56 is passed through the next ceramic sleeve 26. [0007] When molded by the above method, the ceramic sleeve 26 may be broken. In the case of continuous molding, the molding pin 56 whose temperature has risen to some extent is inserted into the ceramic sleeve 26 without waiting for the molding pin temperature to drop to room temperature. , Workability was bad. [0008] The above-mentioned problems, in particular, the destruction of the ceramic sleeve 26 may be caused by, for example, zirconia (linear expansion coefficient: 0.000009 / ° C) in the ceramic sleeve 26 and SKH (linear expansion coefficient: 0.000011 / ° C.). That is, when the linear expansion coefficient of the ceramic sleeve 26 is smaller than the linear expansion coefficient of the molding pin 56, the ceramic sleeve is broken by the expansion pressure of the molding pin 56 due to the temperature rise during molding, and the insertion resistance is large. The workability during continuous molding was reduced. Therefore, a material is selected in which the coefficient of linear expansion of the ceramic sleeve is substantially the same as or larger than the coefficient of linear expansion of the molding pin. When the coefficient of linear expansion of the ceramic sleeve is set to be substantially the same as or larger than the coefficient of linear expansion of the molding pin, (1) the clearance between the ceramic sleeve 26 and the molding pin 56 at room temperature is increased. Even if it is almost non-existent, there is no possibility that the ceramic sleeve 26 will be broken by the expansion pressure of the molding pin 56 due to the temperature rise during molding. (2) When the molding pin 56 whose temperature has risen to some extent and whose outer diameter has become large is inserted into the ceramic sleeve 26, if the molding pin 56 is brought into contact with the inlet of the ceramic sleeve 26, the temperature of the ceramic sleeve 26 rises. As a result, the molding pin 56 can be easily inserted. (3) Further, the molding pin 56 can be easily pulled out in a high temperature state after molding. [Detailed Description of Means for Solving the Problems] For example, zirconia (linear expansion coefficient:
0.000009 / ° C.) and a combination of a cemented carbide (linear expansion coefficient: 0.000005 / ° C.) for the forming pin 56. The clearance between the ceramic sleeve 26 and the molding pin 56 at room temperature may be almost negligible, that is, the inner diameter of the ceramic sleeve 26: 0.6992 mm, the outer diameter of the molding pin 56: 0.6990 mm, or the like. If the coefficient of linear expansion of the ceramic sleeve 26 is significantly different from the coefficient of linear expansion of the resin of the ferrule main body 22, the temperature characteristics of connection loss of the connector deteriorate. Therefore, it is necessary to pay attention to this point. Epoxy resin of ferrule body (linear expansion coefficient: 0.000015 / ° C)
And zirconia of the ceramic sleeve 26 (linear expansion coefficient:
A difference in linear expansion coefficient of about 0.000009 / ° C. is good. Since the coefficient of linear expansion of the ceramic sleeve is substantially equal to or larger than the coefficient of linear expansion of the molding pin, (1) the ceramic sleeve does not break during molding. (2) The work of inserting the molding pin into the ceramic sleeve during continuous molding is facilitated, and the productivity is improved.

【図面の簡単な説明】 【図1】セラミックスリーブでガイド穴24をライニン
グしたフェルールの製造工程を順に示した説明図(本発
明と従来技術に共通)。 【図2】MTコネクタ(セラミックスリーブでガイド穴
をライニングしないもの)の組立て前の状態を模型的に
示した説明図で、(a)は片方のフェルールの斜視図、
(b)は平面図、(c)は側面図。 【図3】MTコネクタ(セラミックスリーブでガイド穴
をライニングしないもの)の結合状態の説明図。 【図4】従来のフェルール(セラミックスリーブでガイ
ド穴をライニングしないもの)の端面の説明図。 【図5】ピンのガイド穴24をセラミックスリーブ26
でライニングしたフェルールの説明図(本発明と従来技
術に共通)。 【図6】フェルール成形に使用する金型の分解説明図
(本発明と従来技術に共通)。 【符号の説明】 10 光ファイバテープ心線 12 光ファイバ 20 フェルール 22 フェルール本体 24 ピンのガイド穴 26 セラミックスリーブ 30 ガイドピン 32 クランプスプリング 40 金型 41 中子 42 下型 44 キャビティ 46 V溝 48 上型 50 トランスファポット 52 キャビティ 54 U溝 56 成形ピン
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view sequentially showing a manufacturing process of a ferrule in which a guide hole 24 is lined with a ceramic sleeve (common to the present invention and the prior art). FIG. 2 is an explanatory view schematically showing a state before assembly of an MT connector (ceramic sleeve with no guide hole lining), (a) is a perspective view of one ferrule,
(B) is a plan view, and (c) is a side view. FIG. 3 is an explanatory view of a connection state of an MT connector (ceramic sleeve with no guide hole lining). FIG. 4 is an explanatory view of an end face of a conventional ferrule (ceramic sleeve not lining a guide hole). FIG. 5 shows a pin guide hole 24 and a ceramic sleeve 26
FIG. 3 is an explanatory view of a ferrule lined with (common to the present invention and the prior art). FIG. 6 is an exploded view of a mold used for ferrule molding (common to the present invention and the prior art). DESCRIPTION OF SYMBOLS 10 Optical fiber ribbon 12 Optical fiber 20 Ferrule 22 Ferrule main body 24 Guide hole 26 of pin Ceramic sleeve 30 Guide pin 32 Clamp spring 40 Mold 41 Core 42 Lower mold 44 Cavity 46 V groove 48 Upper mold 50 Transfer pot 52 Cavity 54 U groove 56 Molding pin

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) G02B 6/38 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) G02B 6/38

Claims (1)

(57)【特許請求の範囲】 【請求項1】 成形ピンを通しておいたセラミックスリ
ーブを、金型に装着しておいてインサート成形し、その
後前記成形ピンを抜き取って、セラミックスリーブでラ
イニングされたガイドピン穴を有するフェルールを得
る、多心光コネクタの製造方法において、前記セラミッ
クスリーブの線膨張係数が、前記成形ピンの線膨張係数
に対して、ほぼ同じかあるいは大きい関係にある材料を
用いることを特徴とする、多心光コネクタの製造方法。
(57) [Claims] [Claim 1] A ceramic sleeve inserted through a molding pin is inserted into a mold and subjected to insert molding. Thereafter, the molding pin is removed, and a guide lined with the ceramic sleeve is taken out. In the method for manufacturing a multi-core optical connector for obtaining a ferrule having a pin hole, it is preferable to use a material in which the coefficient of linear expansion of the ceramic sleeve is substantially the same as or larger than the coefficient of linear expansion of the molded pin. A method for manufacturing a multi-core optical connector.
JP22098994A 1994-08-23 1994-08-23 Manufacturing method of multi-core optical connector Expired - Fee Related JP3396091B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22098994A JP3396091B2 (en) 1994-08-23 1994-08-23 Manufacturing method of multi-core optical connector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22098994A JP3396091B2 (en) 1994-08-23 1994-08-23 Manufacturing method of multi-core optical connector

Publications (2)

Publication Number Publication Date
JPH0862451A JPH0862451A (en) 1996-03-08
JP3396091B2 true JP3396091B2 (en) 2003-04-14

Family

ID=16759731

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22098994A Expired - Fee Related JP3396091B2 (en) 1994-08-23 1994-08-23 Manufacturing method of multi-core optical connector

Country Status (1)

Country Link
JP (1) JP3396091B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108169859A (en) * 2017-12-04 2018-06-15 中航光电科技股份有限公司 A kind of MT type cable assemblies of band protection housing

Also Published As

Publication number Publication date
JPH0862451A (en) 1996-03-08

Similar Documents

Publication Publication Date Title
EP0174013B1 (en) Optical connector and method of manufacturing a pair of ferrules therefor
US5351328A (en) Optical connector with V-grooves having an oxide film
US4952263A (en) Method of making an optical connector and splicer
US4950048A (en) Optical connector ferrule
JPH06250048A (en) Preparation of optical fiber connector
JP2000284150A (en) Connector plug and optical fiber connecting device
US4183737A (en) Method of joining optical fibers with a link piece
JPH0215204A (en) Multicore optical terminal
JP3396091B2 (en) Manufacturing method of multi-core optical connector
JPS63278004A (en) Optical fiber coupling member
JP4140276B2 (en) Manufacturing method of optical connector
JPS6163804A (en) Production of multicore optical connector and ferrule
JP3410672B2 (en) Optical connector and method of manufacturing the same
JPH06226793A (en) Mold for manufacturing ferrule of multifiber optical connector and manufacture thereof
EP1028337A2 (en) Apparatus and method for manufacture of optical fiber plastic connectors
JP3592384B2 (en) Polishing method of optical fiber connector
JP2635189B2 (en) Method for manufacturing multi-core optical connector
JP3660033B2 (en) Multi-fiber optical connector and manufacturing method thereof
Tamaki et al. Field-installable plastic multifiber connector
JPS62131210A (en) Production of optical connector ferrule
JPS5924814A (en) Optical fiber connector
JPH1090555A (en) Optical connector
JPS63261206A (en) Connector for optical fiber and its production
JPH0980264A (en) Multifiber optical connector and its manufacture
JPH0862452A (en) Master plug for multi-core optical connector inspection and manufacture thereof

Legal Events

Date Code Title Description
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20030121

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090207

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100207

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100207

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110207

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120207

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120207

Year of fee payment: 9

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130207

Year of fee payment: 10

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140207

Year of fee payment: 11

LAPS Cancellation because of no payment of annual fees