JPS63104006A - Ferrule for optical fiber - Google Patents
Ferrule for optical fiberInfo
- Publication number
- JPS63104006A JPS63104006A JP25146986A JP25146986A JPS63104006A JP S63104006 A JPS63104006 A JP S63104006A JP 25146986 A JP25146986 A JP 25146986A JP 25146986 A JP25146986 A JP 25146986A JP S63104006 A JPS63104006 A JP S63104006A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- oscone
- ferrule
- strand
- holding sleeve
- 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.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 10
- 238000003780 insertion Methods 0.000 claims abstract description 4
- 230000037431 insertion Effects 0.000 claims abstract description 4
- 229910000978 Pb alloy Inorganic materials 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 230000001070 adhesive effect Effects 0.000 description 6
- 238000005253 cladding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Landscapes
- Mechanical Coupling Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、光ファイバの保護とコネクタ接続のために
光ファイバ端に取付けるフェルール、特に、コアがガラ
ス、クラッド層が樹脂から成るプラスチッククラフトガ
ラスファイバ（ＰＣＦ）及び、コア、クラッド層ともガ
ラスでその２者から成る素線上に更に樹脂製シースを設
けたガラスファイバ（ＡＧＦ）に有効なフェルールに関
する。[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a ferrule that is attached to the end of an optical fiber for protecting the optical fiber and connecting it to a connector. The present invention relates to a ferrule that is effective for fibers (PCF) and glass fibers (AGF) in which both the core and cladding layers are made of glass and a resin sheath is further provided on the strand made of these two.
構成要素の中に光ファイバ端のフェルールが含まれる光
コネクタは、光ファイバのコアとシースの熱膨張係数差
に起因した素線の光軸方向の動きをなくすため、フェル
ールと光ファイバを強固に固着する必要がある。素線が
動くと光の結合損失が増加するからである。Optical connectors that include a ferrule at the end of an optical fiber are made by strengthening the ferrule and optical fiber to eliminate movement of the strands in the optical axis direction due to the difference in thermal expansion coefficient between the core and sheath of the optical fiber. It needs to be fixed. This is because when the wire moves, the coupling loss of light increases.
従来行われている一般的な固着方法は、フェルールと光
ファイバ間の隙間に接着剤を充填する接着方式であるが
、この方法は、接着剤の混合、塗布、硬化等を厳密に管
理する必要があり、組立作業性が非常に悪い。The conventional and common bonding method is to fill the gap between the ferrule and the optical fiber with adhesive, but this method requires strict control of the mixing, application, curing, etc. of the adhesive. , and the assembly workability is very poor.
また、接着剤がフェルールと光ファイバ間の隙間に均一
に回り込み難いこと、及び接着剤に経時劣化があること
のために光ファイバの保持力が不充分となり易く、シー
スの収縮に起因した光ファイバ素線のフェルール端面か
らの突出を完全に無くしきれなかった。In addition, it is difficult for the adhesive to spread evenly into the gap between the ferrule and the optical fiber, and because the adhesive deteriorates over time, the holding force of the optical fiber tends to be insufficient, and the optical fiber may be damaged due to shrinkage of the sheath. It was not possible to completely eliminate the protrusion of the wire from the end face of the ferrule.
別の固着方法として、フェルールの後方部を光ファイバ
のクラッド上又は１次シース上にかしめて固定する方法
もあるが、この方法も、かしめ力によるコアの折損防止
のために高精度のかしめ治具を使ってかしめ条件の厳重
な管理の下で作業を進める必要があることから作業性に
優れず、また、シースに弾性があるためにフェルールの
締付は力が素線に対して確実に及ばないことがあり、そ
のため、接着方式と同様に素線がフェルール端から突出
或いは没入することがあった。Another fixing method is to caulk and fix the rear part of the ferrule onto the cladding or primary sheath of the optical fiber, but this method also uses a high-precision caulking tool to prevent the core from breaking due to caulking force. Workability is not excellent because the work must be carried out under strict control of caulking conditions using tools, and since the sheath has elasticity, tightening of the ferrule does not ensure that the force is applied to the strands. As a result, the strands may protrude or retract from the end of the ferrule, similar to the adhesive method.
そこで、この発明は、組立性と光ファイバの保持安定性
に優れるフェルールを提供しようとするものである。Therefore, the present invention aims to provide a ferrule that is excellent in assemblability and stability in holding an optical fiber.
この発明は、上記の問題点を無くすため、フェルールを
、心線挿入孔の存在した本体と、その前部外周に螺合す
る等して結合する素線６出し孔を有した押えスリーブと
に分けてその両者間に光ファイバの素線又は１次シース
を通す金属製のオスコーンを介在すると共に、オスコー
ンは塑性変形し易い金属によって形成し、また、本体又
は押えスリーブの少なくとも一方にはオスコーンのテー
パ面に対応したテーパ孔を設け、本体と押えスリーブの
結合力でそのオスコーンを上記テーパ孔に押し込み、こ
れによって縮径状態に塑性変形するオスコーンにより、
光ファイバの素線又は１次シースを把持するように構成
したのである。In order to eliminate the above-mentioned problems, the present invention provides a ferrule with a main body having a core wire insertion hole and a presser sleeve having a wire 6 exit hole which is connected to the outer periphery of the front portion by screwing. A metal male cone is interposed between the two to pass the optical fiber strand or primary sheath, and the male cone is made of a metal that is easily plastically deformed. A tapered hole corresponding to the tapered surface is provided, and the male cone is pushed into the tapered hole by the combined force of the main body and the presser sleeve, and the male cone is plastically deformed to a reduced diameter state.
It is configured to grip an optical fiber strand or a primary sheath.
このフェルールは、シースを段剥ぎした光ファイバの端
末部に、本体、オスコーン、押えスリーブの３者を順に
通して本体と押えスリーブによりオスコーンを外周から
締付けるだけで固定されるので組立作業性が非常に良い
。This ferrule is fixed to the end of an optical fiber whose sheath has been stripped in stages, by passing the main body, male cone, and presser sleeve in order, and then tightening the male cone from the outer periphery between the main body and the presser sleeve, making assembly work extremely easy. good for
また、経時劣化がなく、光軸方向の移動も本体と押えス
リーブによって完全に阻止される金属製オスコーンによ
って光ファイバの素線又は１次シース部を全周において
均一な圧力で掴めるので、安定した固着力が得られ、フ
ェルール端からの素線の突出或いは没入が無くなる。In addition, the metal male cone, which does not deteriorate over time and completely prevents movement in the optical axis direction by the main body and presser sleeve, can grip the optical fiber strand or primary sheath with uniform pressure all around the circumference, making it stable. Adhesive force is obtained, and the protrusion or retraction of the strands from the ferrule end is eliminated.
添付図に、この発明の実施例を示す。例示のフェルール
１は、コアとクラッド層から成る素線１）の外周に１次
シース１２を設け、さらに″、この１次シース上には図
示しない補強層（テンションメンバ）を介して２次シー
ス１３を設けて成るプラスチッククランド光ファイバ１
０に取付けるものである。The accompanying drawings show embodiments of the invention. The illustrated ferrule 1 includes a primary sheath 12 provided around the outer periphery of a wire 1 consisting of a core and a cladding layer, and a secondary sheath 12 provided on the primary sheath via a reinforcing layer (tension member) not shown. A plastic-clamped optical fiber 1 comprising 13
It is to be attached to 0.
先ず、第１図に示すフェルール１は、光ファイバの心線
部（２次シースを含む部分）を挿入する孔２ａと、外周
の途中に位置する鍔２ｂと、その鍔よりも前部の外周に
切られた雄ねじ２ｃと、テーパ孔２ｄとを備える本体２
と、小径に形成された先端側の軸心部に素線１）の心出
し孔３ａを有し、段部３ｂを境にして大径に形成された
後方側の内面には雄ねじ２ｃに対応した堰ねじ３ｃを有
する押えスリーブ３と、素線１）の外周に通して本体２
と押えスリーブ３間に介在するオスコーン４とから成る
。First, the ferrule 1 shown in FIG. 1 has a hole 2a into which the core part of the optical fiber (the part including the secondary sheath) is inserted, a collar 2b located in the middle of the outer periphery, and a ferrule 2b located in the middle of the outer periphery, and a ferrule 2b located in the middle of the outer periphery. A main body 2 comprising a male thread 2c cut into a shape and a tapered hole 2d.
It has a centering hole 3a for the strand 1) at the shaft center on the tip side formed with a small diameter, and a male thread 2c is accommodated on the inner surface on the rear side formed with a large diameter with the stepped portion 3b as a boundary. A presser sleeve 3 having a weir screw 3c and a main body 2
and a male cone 4 interposed between a presser sleeve 3 and a presser sleeve 3.
オスコーン４は、第２図に示すように、外周面の全体が
テーパ孔２ｄに対応して一方向に傾斜し、テーパ面４ａ
となっている筒状のコーンであって、中心の孔４ｂは素
線１）の径よりも僅かに大径とされ、また、その全体は
、鉛合金に代表される塑性変形の極めて容易な金属によ
って形成されている。このオスコーン４は、押えスリー
ブの段部３ｂに当接させた大径端側に圧入力を加えて小
径端側を本体のテーパ孔２ｄに圧入する。この圧入によ
り、オスコーン４は塑性変形して縮径し、素線１）の外
周を掴む。As shown in FIG. 2, the male cone 4 has an entire outer peripheral surface inclined in one direction corresponding to the tapered hole 2d, and a tapered surface 4a.
It is a cylindrical cone with a central hole 4b having a slightly larger diameter than the diameter of the strand 1), and the entire cone is made of a material that is extremely easily deformed plastically, such as lead alloy. It is made of metal. This male cone 4 applies a pressing force to the large diameter end which is brought into contact with the stepped portion 3b of the presser sleeve, and press-fits the small diameter end into the tapered hole 2d of the main body. By this press-fitting, the male cone 4 is plastically deformed and reduced in diameter, and grips the outer periphery of the strand 1).
第３図のフェルールは、オスコーンとして全体がソロパ
ン玉に似た第４図のコーン４′を採用したものである。The ferrule shown in FIG. 3 employs the cone 4' shown in FIG. 4, which resembles a solo bread ball as a male cone.
このオスコーン４′は、中間部を大径としてその両側に
ｔ目反する向きのテーパ面４ａ、４ａを付し、さらに、
全体を鉛金属等で形成したもので、一端側のテーパ部が
本体のテーパ孔２ｄに、他端側のテーパ部がテーパ孔２
ｄと逆向きにして押えスリーブ３にも設けられたテーパ
孔３ｄにそれぞれ圧入されるようになっている。This male cone 4' has a large diameter in the middle part, has tapered surfaces 4a, 4a in opposite directions on both sides thereof, and further includes:
The entire body is made of lead metal, etc., and the tapered part on one end is connected to the taper hole 2d of the main body, and the tapered part on the other end is connected to the taper hole 2d.
d, and are press-fitted into tapered holes 3d which are also provided in the presser sleeve 3.
なお、例示のフェルールであると、押えスリーブのねし
込みトルクを管理するか又は押えスリーブ後端を本体の
対向面部に当接させることによってオスコーンによる把
持力を容易に一定に管理できるが、押えスリーブ３と本
体２の結合はねじ方 ２式に限定されない。例えば、ハ
イヨネソト結合方式や止めねしによる固定であってもよ
いし、また、押えスリーブの後端側を本体の前部外周に
かしめて取外し不可能に固定してもよい。In addition, with the illustrated ferrule, the gripping force by the male cone can be easily controlled at a constant level by controlling the screw-in torque of the presser sleeve or by bringing the rear end of the presser sleeve into contact with the opposing surface of the main body. The connection between the sleeve 3 and the main body 2 is not limited to the two screw methods. For example, the holding sleeve may be fixed using a fastening method or a set screw, or the rear end side of the presser sleeve may be caulked to the front outer periphery of the main body and fixed irremovably.
また、いずれの実施例においても、オスコーンの中心孔
径を光ファイバの１次シース部径よりも僅かに大きくし
てオスコーンによる素線の把持を１次ノース上から行な
ってもよい。Furthermore, in any of the embodiments, the diameter of the center hole of the male cone may be slightly larger than the diameter of the primary sheath portion of the optical fiber, and the strands may be gripped by the male cone from above the primary north.
以上延べたように、この発明のフェルールは、光ファイ
バの素線又は１次シース上に通したオスコーンを本体と
押えリングの結合力を利用してテーパ孔に圧入するだけ
でオスコーンが縮径して素線又は１次シース部を把持す
るので、組立作業が容易になる。As described above, in the ferrule of the present invention, the diameter of the male cone can be reduced by simply pressing the male cone passed over the optical fiber strand or primary sheath into the tapered hole using the bonding force between the main body and the holding ring. Since the strands or the primary sheath portion are gripped by the handle, assembly work is facilitated.
また、オスコーンは、テーパ面の係合作用により、全周
にムラなく圧縮力を受けて素線又は１次シース部を全周
において均一な力で把持するので、極めて強固で安定し
た固着力が得られ、しかも、その力は、光軸方向の動き
が本体と押えスリーブによって阻止されたオスコーンが
金属から成り、しかも塑性変形してファイバを掴むため
経時的に弱まる心配がなく、従って、長期間にわたり、
光ファイバの熱膨張差による端面変位を防止でき、その
変位に起因した光結合効率の低下を無くせると云う効果
が得られる。In addition, the male cone receives compressive force evenly around the entire circumference due to the engagement action of the tapered surface, and grips the wire or primary sheath part with uniform force around the entire circumference, so it has an extremely strong and stable fixing force. Moreover, the male cone, whose movement in the optical axis direction is prevented by the main body and the holding sleeve, is made of metal and is plastically deformed to grip the fiber, so there is no fear that the force will weaken over time. Over the course of
It is possible to prevent end face displacement due to the difference in thermal expansion of the optical fiber, and to eliminate a decrease in optical coupling efficiency caused by the displacement.
第１図は、この発明のフェルールの一例を示す使用状態
の縦断面図、第２図は第１図のフェルールに用いたオス
コーンの斜視図、第３図は他の実施例の使用状態を示す
縦断面図、第４図は第３図のフェルールに用いたオスコ
ーンの斜視図である。
１・・・・・・フェルール、２・・・・・・本体、２ａ
・・・・・・心線挿入孔、２ｂ・・・・・・鍔、２Ｃ・
・・・・・雄ねじ、２ｄ・・・・・・テーパ孔、３・・
・・・・押えスリーブ、３ａ・・・・・・素綿必用し孔
、３Ｃ・・・・・・雌ねじ、３ｄ・・・・・・テーパ孔
、４．４′・・・・・・オスコーン、４ａ・・・・・・
テーパ面、４ｂ・・・・・・中心孔、４Ｃ・・・・・・
縦割り溝。Fig. 1 is a vertical cross-sectional view showing an example of the ferrule of the present invention in use, Fig. 2 is a perspective view of a male cone used in the ferrule of Fig. 1, and Fig. 3 shows another embodiment in use. The vertical sectional view and FIG. 4 are perspective views of the male cone used in the ferrule of FIG. 3. 1... Ferrule, 2... Body, 2a
... Core wire insertion hole, 2b ... Tsuba, 2C.
...Male thread, 2d...Tapered hole, 3...
... Presser sleeve, 3a ... Hole required for cotton, 3C ... Female thread, 3d ... Tapered hole, 4.4' ... Male cone , 4a...
Tapered surface, 4b...center hole, 4C...
Vertical groove.
Claims (2)
に露出させる光ファイバ素線の心出し孔を先端側に有し
、後端側は上記本体の前部外周に結合される押えスリー
ブと、光ファイバの素線又は１次シース上に緩く通して
本体と押えスリーブとの間に介在する金属製のオスコー
ンとから成り、上記オスコーンは塑性変形し易い金属で
形成され、さらに、本体又は押えスリーブの少なくとも
一方にはオスコーンのテーパ面に対応したテーパ孔が設
けられ、本体と押えスリーブの結合力でオスコーンが上
記テーパ孔に押し込まれて縮径状態に塑性変形し、光フ
ァイバの素線又は１次シースを把持するように構成され
た光ファイバ用フェルール。(1) A main body having a core insertion hole for the optical fiber, and a centering hole for the optical fiber exposed at the end of the core on the front end side, and the rear end side is connected to the front outer periphery of the main body. It consists of a holding sleeve and a metal male cone that is loosely passed over the optical fiber strand or primary sheath and interposed between the main body and the holding sleeve, the male cone being made of a metal that is easily plastically deformed, and further comprising: At least one of the main body and the holding sleeve is provided with a tapered hole corresponding to the tapered surface of the male cone, and the male cone is pushed into the tapered hole by the bonding force between the main body and the holding sleeve, and is plastically deformed to a reduced diameter state, thereby reducing the diameter of the optical fiber. An optical fiber ferrule configured to grip a strand or a primary sheath.
特徴とする特許請求の範囲第（１）項記載の光ファイバ
用フェルール。(2) The optical fiber ferrule according to claim (1), wherein the metal forming the male cone is a lead alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25146986A JPS63104006A (en) | 1986-10-21 | 1986-10-21 | Ferrule for optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25146986A JPS63104006A (en) | 1986-10-21 | 1986-10-21 | Ferrule for optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63104006A true JPS63104006A (en) | 1988-05-09 |
Family
ID=17223275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25146986A Pending JPS63104006A (en) | 1986-10-21 | 1986-10-21 | Ferrule for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63104006A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6181865B1 (en) | 1999-04-02 | 2001-01-30 | Perkinelmer Instruments Llc | Self aligning optical fiber terminator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5170651A (en) * | 1974-11-07 | 1976-06-18 | Itt | |
| JPS5563506A (en) * | 1978-11-06 | 1980-05-13 | Hitachi Ltd | Control of motor for driving vehicle |
| JPS60198508A (en) * | 1984-03-22 | 1985-10-08 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber connector |
-
1986
- 1986-10-21 JP JP25146986A patent/JPS63104006A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5170651A (en) * | 1974-11-07 | 1976-06-18 | Itt | |
| JPS5563506A (en) * | 1978-11-06 | 1980-05-13 | Hitachi Ltd | Control of motor for driving vehicle |
| JPS60198508A (en) * | 1984-03-22 | 1985-10-08 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber connector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6181865B1 (en) | 1999-04-02 | 2001-01-30 | Perkinelmer Instruments Llc | Self aligning optical fiber terminator |
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