JP2003098380A - Ferrule for diameter conversion, its machining method, and optical component using the ferrule - Google Patents
Ferrule for diameter conversion, its machining method, and optical component using the ferruleInfo
- Publication number
- JP2003098380A JP2003098380A JP2001293023A JP2001293023A JP2003098380A JP 2003098380 A JP2003098380 A JP 2003098380A JP 2001293023 A JP2001293023 A JP 2001293023A JP 2001293023 A JP2001293023 A JP 2001293023A JP 2003098380 A JP2003098380 A JP 2003098380A
- Authority
- JP
- Japan
- Prior art keywords
- ferrule
- diameter
- cylindrical portion
- small
- hole
- 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
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、光通信に用いられ
る径変換用フェルール及びその加工方法およびそれを用
いた径変換器および光レセプタクルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diameter conversion ferrule used for optical communication, a method for processing the ferrule, and a diameter converter and an optical receptacle using the ferrule.
【０００２】[0002]
【従来の技術】光ファイバ通信技術は著しい発展を遂げ
ており、光ファイバ応用の各種装置、機器は、既に多数
設置されている。これら、既設の装置に用いられている
光コネクタ、光レセプタクルは、φ２．５ｍｍのフェル
ールを持つＳＣ型の光コネクタが主流であった。2. Description of the Related Art Optical fiber communication technology has made remarkable progress, and a large number of various devices and equipment for optical fiber application have already been installed. The optical connectors and optical receptacles used in these existing devices were mainly SC type optical connectors having a ferrule of φ2.5 mm.
【０００３】しかしながら、近年、その半分の直径であ
るφ１．２５ｍｍのフェルールを用いたＭＵ型もしくは
ＬＣ型光コネクタが登場し、これらを既設の装置に用い
られているφ２．５ｍｍのフェルールをもつ光コネクタ
に接続する必要性が生じてきている。However, in recent years, an MU type or LC type optical connector using a ferrule of φ1.25 mm, which is half the diameter of the optical fiber, has appeared, and an optical fiber having a φ2.5 mm ferrule used in an existing device has been introduced. The need to connect to connectors is emerging.
【０００４】図７は従来の径変換器８０を示し、中心軸
を同一とする大径円筒部７０ａと小径円筒部７０ｂから
なり、前記中心軸上に沿って光ファイバ７１を一貫内通
した径変換用フェルール７０を用いることにより、両端
にそれぞれ一端を外嵌した２ヶの割スリーブ７２，７３
で直径の異なるフェルールを有するプラグを接続してい
た（特開平５−８８０４３号公報参照）。FIG. 7 shows a conventional diameter converter 80, which comprises a large-diameter cylindrical portion 70a and a small-diameter cylindrical portion 70b having the same central axis, and a diameter through which an optical fiber 71 is consistently passed along the central axis. By using the conversion ferrule 70, two split sleeves 72, 73, one end of which is fitted on the other, respectively.
Therefore, plugs having ferrules having different diameters were connected (see Japanese Patent Laid-Open No. 5-88043).
【０００５】この従来の径変換器８０に用いる径変換用
フェルール７０は図８に示すように、単一の部材からな
り、貫通孔７０ｃ、片端および他端の各端面７０ｄ、７
０ｅ、大径円筒部７０ａ、小径円筒部７０ｂを成形、加
工等で形成しなければならなかった。As shown in FIG. 8, the diameter converting ferrule 70 used in the conventional diameter converter 80 is made of a single member, and has a through hole 70c and end faces 70d, 7 at one end and the other end.
0e, the large-diameter cylindrical portion 70a, and the small-diameter cylindrical portion 70b had to be formed by molding and processing.
【０００６】一般的な加工方法としては、予め貫通孔７
０ｃと大径円筒部７０ａを研磨もしくは研削加工にて仕
上げておき、図９に示すように大径円筒部７０ａを工作
機械のチャック７４に挟み、貫通孔７０ｃの他端側に先
端が円錐形状の心金７５で押さえて、チャック７４を高
速回転させてダイヤモンド砥石７６を図上で左右方向へ
交互に移動させながら図上で下方向へ切り込みをかけ
て、大径円筒部７０ａを削り小径円筒部７０ｂを形成し
ていた。As a general processing method, the through hole 7 is previously prepared.
0c and the large-diameter cylindrical portion 70a are finished by polishing or grinding, the large-diameter cylindrical portion 70a is sandwiched by the chuck 74 of the machine tool as shown in FIG. 9, and the tip is conical at the other end of the through hole 70c. While holding down the mandrel 75, the chuck 74 is rotated at a high speed and the diamond grindstone 76 is alternately moved in the left-right direction in the drawing, and a notch is made in the downward direction in the drawing, and the large-diameter cylindrical portion 70a is ground to form a small-diameter cylinder The portion 70b was formed.
【０００７】[0007]
【発明が解決しようとする課題】ところが、径変換用フ
ェルールに要求される寸法精度は貫通孔７０ｃと大径円
筒部７０ａ外周との同芯度および貫通孔７０ｃと小径円
筒部７０ｂ外周との同芯度は共に１μｍ以内でなければ
ならなかった。However, the dimensional accuracy required for the diameter conversion ferrule is concentricity between the through hole 70c and the outer circumference of the large diameter cylindrical portion 70a, and the same dimensional accuracy between the through hole 70c and the outer circumference of the small diameter cylindrical portion 70b. Both the cores had to be within 1 μm.
【０００８】この理由は、両端面において、接続すべき
大小コネクタのフェルールと径変換用フェルールとの位
置ずれが生じ、その結果接続損失を増大させる原因とな
るからである。The reason is that the ferrules of the large and small connectors to be connected and the diameter converting ferrule are misaligned on both end faces, resulting in an increase in connection loss.
【０００９】従来の図９に示す加工方法では、心金７５
で貫通孔７０ｃの他端側を押さえて、径変換用フェルー
ル７０が振れるのを防いでいるが、貫通孔７０ｃを仕上
る際に端面と貫通孔７０ｃとの境界部に曲面が形成され
るかもしくはかけが発生するために、貫通孔７０ｃの真
の中心位置を押さえることが出来ず、その結果、加工し
た小径円筒部７０ｂと貫通孔７０ｃとの同芯度が安定し
て１μｍに収まらず、加工したものの中から同芯度が１
μｍ以内のもののみを選別して、径変換器８０に用いて
いた。その為、径変換用フェルール７０のコストが膨大
になってしまうという課題を抱えていた。In the conventional processing method shown in FIG. 9, a mandrel 75
The other end side of the through hole 70c is pressed to prevent the diameter converting ferrule 70 from swinging. However, when finishing the through hole 70c, a curved surface is formed at the boundary between the end face and the through hole 70c, or Since the true center position of the through hole 70c cannot be held because of the occurrence of the crossing, as a result, the concentricity between the processed small diameter cylindrical portion 70b and the through hole 70c is not stably within 1 μm, Concentricity is 1 out of
Only those within μm were selected and used for the diameter converter 80. Therefore, there is a problem that the cost of the diameter conversion ferrule 70 becomes enormous.
【００１０】[0010]
【課題を解決するための手段】上記課題に鑑みて本発明
は、長手方向に貫通孔を有する小径フェルールの一方端
側の外周に円筒体を固定して大径円筒部とし、他方端側
を小径円筒部としたことを特徴とする。In view of the above problems, the present invention provides a large-diameter cylindrical portion by fixing a cylindrical body to the outer periphery of one end side of a small diameter ferrule having a through hole in the longitudinal direction, and the other end side. It is characterized in that it has a small diameter cylindrical portion.
【００１１】また、上記大径円筒部側における円筒体の
端面から小径フェルールの端面が突出していることを特
徴とする。The end face of the small-diameter ferrule projects from the end face of the cylindrical body on the large-diameter cylindrical portion side.
【００１２】更に、上記小径フェルールの外周面仕上加
工したあと、一方端側の外周に円筒体を固定し、上記小
径フェルールの外周面を基準にして円筒体の外周面を仕
上加工することを特徴とする。Further, after finishing the outer peripheral surface of the small diameter ferrule, a cylindrical body is fixed to the outer periphery at one end side, and the outer peripheral surface of the cylindrical body is finished with reference to the outer peripheral surface of the small diameter ferrule. And
【００１３】しかも、上記径変換用フェルールの貫通孔
に光ファイバを挿入固定し、両端面を光ファイバととも
に研磨仕上げしたファイバスタブを径変換器もしくは光
レセプタクルに用いたことを特徴とする。Moreover, the fiber stub having the optical fiber inserted and fixed in the through hole of the diameter converting ferrule and having both end surfaces polished and finished together with the optical fiber is used for the diameter converter or the optical receptacle.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施形態を図を用
いて説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００１５】図１は、本発明に係る径変換用フェルール
を示す断面図である。FIG. 1 is a sectional view showing a ferrule for diameter conversion according to the present invention.
【００１６】本発明の径変換用フェルール１０は、長手
方向に貫通孔１ｂを有し一方端１ｅに大径円筒部２ａと
他方端１ｆに小径円筒部１ａを有し、小径フェルール１
が長手方向の全長にわたり配置され、該小径フェルール
１の一方端１ｅ側に円筒体２が固定されて大径円筒部２
ａが形成され、他方端１ｆ側は小径フェルール１のまま
で小径円筒部となっている。しかも、円筒体２の一方端
１ｅ側端面からは小径フェルール１の端面１ｃおよび一
部外周面が突出している。The diameter converting ferrule 10 of the present invention has a through hole 1b in the longitudinal direction, a large diameter cylindrical portion 2a at one end 1e, and a small diameter cylindrical portion 1a at the other end 1f, and a small diameter ferrule 1 is provided.
Are arranged over the entire length in the longitudinal direction, and the cylindrical body 2 is fixed to the one end 1e side of the small diameter ferrule 1 to form the large diameter cylindrical portion 2
a is formed, and the other end 1f side is a small diameter cylindrical portion with the small diameter ferrule 1 still being formed. Moreover, the end surface 1c and a part of the outer peripheral surface of the small-diameter ferrule 1 protrude from the end surface on the one end 1e side of the cylindrical body 2.
【００１７】以降、本発明の径変換フェルール１０の一
方端１ｅ側とは大径円筒部１ａ側を示し、他方端１ｆ側
とは小径円筒部１ｂ側を示すこととして説明する。In the following description, the one end 1e side of the diameter conversion ferrule 10 of the present invention indicates the large diameter cylindrical portion 1a side, and the other end 1f side indicates the small diameter cylindrical portion 1b side.
【００１８】小径フェルール１の材質は、樹脂、金属、
セラミック、ガラスいずれでも用いることが出来るが、
特にジルコニアを主成分とするセラミックスが最適であ
る。具体的には、ＺｒＯ2を主成分とし、安定化剤とし
てＹ2Ｏ3、ＭｇＯ、ＣａＯ、ＣｅＯ2、Ｄｙ2Ｏ3等の一
種以上を含有するもので、正方晶の結晶を主体とした部
分安定化ジルコニアセラミックスを用いる。又、この様
なジルコニアセラミックス製の小径フェルール１を製造
する場合は、上記の原料粉末を用い、押出成形や射出成
形もしくはプレス成形等で所定形状に成形した後、焼成
することによって得られる。The material of the small diameter ferrule 1 is resin, metal,
Either ceramic or glass can be used,
Especially, ceramics containing zirconia as a main component are most suitable. Specifically, it contains ZrO 2 as a main component and one or more of Y 2 O 3 , MgO, CaO, CeO 2 , Dy 2 O 3 and the like as a stabilizer, and mainly contains tetragonal crystals. Partially stabilized zirconia ceramics are used. When manufacturing such a small-diameter ferrule 1 made of zirconia ceramics, it is obtained by using the above-mentioned raw material powder, molding it into a predetermined shape by extrusion molding, injection molding, press molding or the like, and then firing it.
【００１９】このジルコニアセラミックスは平均結晶粒
径が０．１μｍ〜１．０μｍであり、かつ気孔率が３％
以下であるものが適用可能である。ここで結晶粒径が
１．０μｍを越えると結晶間の空隙が大きくなり良好な
外周面が得られず、又原料混合時ボールミル等で粉砕を
行う時に安定して０．１μｍ以下に粒度を調整すること
が困難であり、焼成後は結晶が粒成長するため更に径が
大きくなる為に０．１μｍ以上とした。気孔率はフェル
ールの個体中に含まれる空隙の割合を百分率であらわし
たもので３％を越えると気孔部分が外周面粗度を悪化さ
せてしまうことになる。This zirconia ceramics has an average crystal grain size of 0.1 μm to 1.0 μm and a porosity of 3%.
The following are applicable: If the crystal grain size exceeds 1.0 μm, the voids between the crystals become large and a good outer peripheral surface cannot be obtained, and the grain size is stably adjusted to 0.1 μm or less when pulverizing with a ball mill etc. when mixing the raw materials. It is difficult to do so, and the grain size grows after firing, and the diameter further increases. The porosity is a percentage of voids contained in the ferrule, and if it exceeds 3%, the porosity deteriorates the outer peripheral surface roughness.
【００２０】また、円筒体２の材質は上記小径フェルー
ル１同様に樹脂、金属、セラミック、ガラスいずれでも
用いることが出来るが、特に金属が望ましい。これは、
大径円筒部２ａの外側には精密な内径精度を持つ精密ス
リーブかもしくはスリットを有しスリーブの弾性力でフ
ェルールを把持する割スリーブのいずれかがはめ込まれ
るが、径変換器においてもこのあと説明する光レセプタ
クル等の光部品において、繰り返し脱着の少ない部分に
使用されるために、セラミックを使う必要がなく、しか
も加工がしやすいことから金属を用いることが特に望ま
しい。The material of the cylindrical body 2 may be any of resin, metal, ceramics and glass as in the case of the small diameter ferrule 1, but metal is particularly preferable. this is,
Either a precision sleeve having a precise inner diameter precision or a split sleeve having a slit and holding the ferrule by the elastic force of the sleeve is fitted on the outer side of the large-diameter cylindrical portion 2a. It is particularly preferable to use a metal because it is used in a part of the optical receptacle such as an optical receptacle that is not repeatedly attached and detached, so that it is not necessary to use ceramics and the process is easy.
【００２１】次に、小径フェルール１と円筒体２の固定
方法は、圧入、接着、半田、低融点ガラス、レーザ溶接
等様々な接合方法を用いることが出来る。この中でも、
特に圧入により固定する方法がコスト面、接合強度の
面、接合強度の面いずれをとっても好ましい。また、円
筒体２を金属とした場合には、金属の延性を利用出来る
のでして圧入で固定することが特に望ましい。Next, as a method for fixing the small diameter ferrule 1 and the cylindrical body 2, various joining methods such as press fitting, bonding, soldering, low melting point glass, laser welding and the like can be used. Among these,
Particularly, the method of fixing by press fitting is preferable in terms of cost, bonding strength, and bonding strength. Further, when the cylindrical body 2 is made of metal, the ductility of the metal can be utilized, and therefore it is particularly desirable to fix it by press fitting.
【００２２】また、主剤と硬化剤からなる二液性のエポ
キシ接着剤もしくは紫外線硬化型の接着剤を用いる方法
も好ましい方法である。これは、接着剤は安価でしか
も、扱いやすく、安全なことと、光ファイバとフェルー
ルの貫通孔を接着剤を用いて固定することが一般的な方
法なので、光部品としての耐環境性の信頼性が高いから
である。A method using a two-component epoxy adhesive composed of a main agent and a curing agent or an ultraviolet curing adhesive is also a preferable method. This is because the adhesive is cheap, easy to handle, safe, and it is a common method to fix the through holes of the optical fiber and ferrule with an adhesive. This is because the property is high.
【００２３】次に、本発明の径変換用フェルール１０の
片端側の様々な実施形態を図２を用いて説明する。Next, various embodiments of the ferrule 10 for diameter conversion of the present invention on one end side will be described with reference to FIG.
【００２４】図２（ａ）は円筒体２の端面からフェルー
ルの凸球面をした端面１ｃのみが突出しており、図２
（ｂ）は円筒体２の端面１ｃとＣ面部１ｄが突出してい
る。又図２（ｃ）〜（ｅ）は端面１ｃが平面、斜め平
面、斜め球面となっている。ここで図２（ｂ）以外は図
上はＣ面部１ｄを表していないが、Ｃ面部１ｄを有した
形状でも同一の効果を有する。In FIG. 2A, only the end surface 1c, which is a convex spherical surface of the ferrule, projects from the end surface of the cylindrical body 2.
In (b), the end surface 1c and the C surface portion 1d of the cylindrical body 2 are projected. In addition, in FIGS. 2C to 2E, the end surface 1c is a flat surface, an oblique flat surface, or an oblique spherical surface. Here, except for FIG. 2B, the C-face portion 1d is not shown in the drawings, but the shape having the C-face portion 1d has the same effect.
【００２５】次に、本発明の径変換用フェルール１０の
他端側の様々な実施形態を図３を用いて説明する。Next, various embodiments of the other end of the diameter converting ferrule 10 of the present invention will be described with reference to FIG.
【００２６】図３（ａ）〜（ｃ）は他端の端面形状がそ
れぞれ平面、斜め平面、斜め球面となっており、いずれ
の形状であっても本発明の効果を奏することが出来る。
また、Ｃ面部１ｄを有した形状としているが、本発明に
おいてＣ面部１ｄは必須条件ではないのでＣ面部１ｄが
なくとも本発明が奏する効果に影響はない。In FIGS. 3A to 3C, the end face shape at the other end is a flat surface, a slanting flat surface, and a slanting spherical surface, respectively, and the effect of the present invention can be obtained in any shape.
Further, although the shape has the C surface portion 1d, since the C surface portion 1d is not an essential condition in the present invention, the effect of the present invention is not affected even without the C surface portion 1d.
【００２７】次に、本発明の径変換用フェルールの製造
方法について説明する。Next, a method for manufacturing the ferrule for diameter conversion of the present invention will be described.
【００２８】図４に本発明の径変換用フェルールの加工
方法を説明する断面図を示す。FIG. 4 is a sectional view for explaining the method of processing the ferrule for diameter conversion of the present invention.
【００２９】まず、成形、焼成、引き抜き等で円筒状の
母材を得て、貫通孔１ｂを仕上げたあと、両端のＣ面部
１ｄを加工し、外周面を所定の寸法精度及び面粗さにな
るように仕上げる。このとき外周面の表面粗さは算術平
均粗さ（Ｒａ）で０．１μｍ以下に仕上げ、外径の寸法
公差は１μｍ以内、貫通孔１ｂと外径との同芯度は１μ
ｍ以下にしておく。First, a cylindrical base material is obtained by molding, firing, drawing, etc., and the through holes 1b are finished, and then the C-face portions 1d at both ends are processed to make the outer peripheral surface have a predetermined dimensional accuracy and surface roughness. To finish. At this time, the surface roughness of the outer peripheral surface is finished to 0.1 μm or less in terms of arithmetic average roughness (Ra), the dimensional tolerance of the outer diameter is within 1 μm, and the concentricity between the through hole 1b and the outer diameter is 1 μm.
Keep it below m.
【００３０】次に、片端に円筒体２を圧入等で固定す
る。このとき、円筒体２の端面から少なくとも端面１ｃ
を突出させていることが重要で、こうすることにより、
相手側のフェルールの先端面とは小径フェルール１の先
端面しか接触しないようになるために、本発明の径変換
用フェルール１０に光ファイバを固定し、両端面を光フ
ァイバの端面と共に研磨仕上げしてファイバスタブを形
成するときに、研磨面積が少なくなり、製造コストを安
価に出来ることとなる。Next, the cylindrical body 2 is fixed to one end by press fitting or the like. At this time, from the end surface of the cylindrical body 2 to at least the end surface 1c
It is important that the
Since only the tip surface of the small-diameter ferrule 1 comes into contact with the tip surface of the ferrule on the other side, the optical fiber is fixed to the diameter-converting ferrule 10 of the present invention, and both end surfaces are polished and finished together with the end surface of the optical fiber. When the fiber stub is formed by using the above method, the polishing area is reduced and the manufacturing cost can be reduced.
【００３１】更には、図４に示すように、小径フェルー
ル１の他端面を円筒研削盤等の工作機械のチャック２１
に挟み込んで固定し、片端の円筒体２から突出した外周
面を振れ止めのために更にチャック２２に挟み込んで押
さえて、チャック２１を高速回転させてダイヤモンド砥
石２３を図上で左右方向へ交互に移動させながら図上で
下方向へ切り込みをかけて、円筒体２の外周面を削り、
大径円筒部２ａの外周面を所定の寸法精度及び面粗さに
なるように仕上げる。Further, as shown in FIG. 4, the other end surface of the small diameter ferrule 1 is attached to a chuck 21 of a machine tool such as a cylindrical grinder.
The outer peripheral surface protruding from the cylindrical body 2 at one end is further sandwiched and pressed by the chuck 22 for steadying, and the chuck 21 is rotated at a high speed to alternate the diamond grindstones 23 in the horizontal direction in the figure. While moving, make a cut in the downward direction on the figure to scrape the outer peripheral surface of the cylindrical body 2,
The outer peripheral surface of the large-diameter cylindrical portion 2a is finished to have predetermined dimensional accuracy and surface roughness.
【００３２】このとき、小径フェルール１の加工同様
に、大径円筒部２ａの外周面の表面粗さは算術平均粗さ
（Ｒａ）で０．１μｍ以下に仕上げ、外径の寸法公差は
１μｍ以内、貫通孔１ｂと外径との同芯度は１μｍ以下
にしておく。At this time, similarly to the processing of the small diameter ferrule 1, the surface roughness of the outer peripheral surface of the large diameter cylindrical portion 2a is finished to 0.1 μm or less in terms of arithmetic average roughness (Ra), and the dimensional tolerance of the outer diameter is within 1 μm. The concentricity between the through hole 1b and the outer diameter is set to 1 μm or less.
【００３３】以上、一例で説明したが、この加工方法に
限ることなく、本発明の長手方向に貫通孔１ｂを有し片
端に大径円筒部２ａと他端に小径円筒部１ａを有し、小
径フェルール１が長手方向の全長にわたり配置され、該
小径フェルール１の片端側に円筒体２が固定されて大径
円筒部２ａが形成されている径変換用フェルール１０を
形成することの出来うる方法であれば、いかなる方法で
もかまわない。As described above by way of example, the present invention is not limited to this processing method, and the through hole 1b is provided in the longitudinal direction of the present invention, and the large diameter cylindrical portion 2a is provided at one end and the small diameter cylindrical portion 1a is provided at the other end. A method capable of forming the diameter converting ferrule 10 in which the small diameter ferrule 1 is arranged over the entire length in the longitudinal direction, and the cylindrical body 2 is fixed to one end side of the small diameter ferrule 1 to form the large diameter cylindrical portion 2a. If so, any method will do.
【００３４】次に、本発明の径変換用フェルール１０を
用いた光部品について説明する。Next, an optical component using the diameter converting ferrule 10 of the present invention will be described.
【００３５】図５は径変換器３０の断面図であり、小径
側コネクタハウジング３４と大径側コネクタハウジング
３５の内部に、中心軸を同一とする太径円筒部２ａと細
径円筒部１ａを有した径変換用フェルール１０に、前記
中心軸上に沿って光ファイバ３１を一貫内通したファイ
バスタブを有しており、該ファイバスタブの両端にそれ
ぞれ割スリーブ３２、３３を外嵌している。こうした構
成にすることによりり、直径の異なるフェルールを有す
るプラグを本発明の径変換器３０に接続することが出来
る。FIG. 5 is a sectional view of the diameter converter 30. Inside the small diameter side connector housing 34 and the large diameter side connector housing 35, a large diameter cylindrical portion 2a and a small diameter cylindrical portion 1a having the same central axis are provided. The diameter converting ferrule 10 has a fiber stub in which the optical fiber 31 is consistently passed through along the central axis, and split sleeves 32 and 33 are externally fitted to both ends of the fiber stub. . With this configuration, plugs having ferrules with different diameters can be connected to the diameter converter 30 of the present invention.
【００３６】ここでは、径変換器を両端面からプラグを
挿入して連結させる径変換アダプタとして表している
が、一方の端面からフェルールが突出した径変換プラグ
とすることでも同一の効果を奏することが出来る。Here, the diameter converter is shown as a diameter conversion adapter in which plugs are inserted from both end surfaces to be connected, but the same effect can be obtained by using a diameter conversion plug with a ferrule protruding from one end surface. Can be done.
【００３７】次に、図６は光レセプタクル４０の断面図
を示し、ハウジング４３、４４の内部に、中心軸を同一
とする大径円筒部２ａと小径円筒部１ａを有した径変換
用フェルール１０に、前記中心軸上に沿って光ファイバ
４１を一貫内通したファイバスタブを有しており、大径
円筒部２ａの外周にスリーブ４２を取り付けた構成とし
ている。FIG. 6 is a sectional view of the optical receptacle 40. The diameter conversion ferrule 10 has a large diameter cylindrical portion 2a and a small diameter cylindrical portion 1a having the same central axis inside the housings 43 and 44. In addition, it has a fiber stub in which the optical fiber 41 is consistently passed along the central axis, and a sleeve 42 is attached to the outer circumference of the large diameter cylindrical portion 2a.
【００３８】本発明の径変換用フェルール１０を光レセ
プタクル４０に適用することにより、φ１．２５ｍｍの
フェルールを用いた光コネクタでもφ２．５ｍｍのフェ
ルールを用いた光コネクタでもハウジング４３は及び小
径フェルール１は共通部品と出来るので、光コネクタの
フェルールの外径の如何を問わず予め準備することが出
来、製造の納期を短縮することが出来る。By applying the diameter conversion ferrule 10 of the present invention to the optical receptacle 40, the housing 43 and the small diameter ferrule 1 can be used for both an optical connector using a ferrule of φ1.25 mm and an optical connector using a ferrule of φ2.5 mm. Since it can be a common component, it can be prepared in advance regardless of the outer diameter of the ferrule of the optical connector, and the delivery time of manufacturing can be shortened.
【００３９】本発明の光レセプタクル４０は、小径フェ
ルール１を長手方向の全長にわたり配置し、該小径フェ
ルール１の片端側に円筒体２を固定して大径円筒部２ａ
を形成した径変換用フェルール１０を用いていればよ
く、図６に示す構成でなくともよい。In the optical receptacle 40 of the present invention, the small diameter ferrule 1 is arranged over the entire length in the longitudinal direction, and the cylindrical body 2 is fixed to one end side of the small diameter ferrule 1 and the large diameter cylindrical portion 2a.
It suffices to use the diameter-converting ferrule 10 in which the above is formed, and the structure shown in FIG.
【００４０】以上、寸法精度を石英ガラスファイバのシ
ングルモードの規格で説明してきたが、これに限ること
なく、マルチモードでもよく、更にはプラスチックファ
イバにも適用することができる。Although the dimensional accuracy has been described in the standard of the single mode of the silica glass fiber, the invention is not limited to this, and the multimode may be used, and further, the plastic fiber can be applied.
【００４１】[0041]
【実施例】ここで、以下に示す方法で実験を行った。EXAMPLES Here, an experiment was conducted by the following method.
【００４２】図１に示す本発明の径変換用フェルール１
０と、比較例として図８に示す従来径変換用フェルール
７０をそれぞれ２０個作成し、貫通孔１ｃと大径円筒部
外周との同芯度（Ｄ１）と貫通孔１ｃと小径円筒部外周
との同芯度（Ｄ２）を測定し比較した。The diameter converting ferrule 1 of the present invention shown in FIG.
0 and 20 conventional ferrules 70 for diameter conversion shown in FIG. 8 as comparative examples, respectively, and concentricity (D1) between the through hole 1c and the outer circumference of the large diameter cylindrical portion, the through hole 1c, and the outer circumference of the small diameter cylindrical portion. The concentricity (D2) was measured and compared.
【００４３】本発明の径変換用フェルール１０は予め、
ジルコニアにて小径フェルール１を貫通孔１ｃ、小径円
筒部１ａ、Ｃ面部１ｄを仕上げておき、ステンレス製の
円筒体２を圧入にて固定し、その後、図４に示す加工方
法で、円筒研削盤にて小径円筒部１ａを基準として円筒
体２の外周面を研削加工した。The diameter conversion ferrule 10 of the present invention is previously
The small-diameter ferrule 1 is finished by zirconia in the through-hole 1c, the small-diameter cylindrical portion 1a, and the C-face portion 1d, and the stainless steel cylindrical body 2 is fixed by press fitting, and then the cylindrical grinding machine is processed by the processing method shown in FIG. The outer peripheral surface of the cylindrical body 2 was ground with reference to the small diameter cylindrical portion 1a.
【００４４】また、従来の径変換用フェルール７０は、
ジルコニアにて磁器を成形、焼成し、予め貫通孔７０ｃ
と大径円筒部７０ａを研磨及び研削加工にて仕上げてお
き、図９に示すように大径円筒部７０ａを円筒研削盤に
て、大径円筒部７０ａを削り小径円筒部７０ｂを形成し
た。Further, the conventional diameter conversion ferrule 70 is
Porcelain is molded with zirconia and fired, and the through hole 70c is prepared in advance.
The large diameter cylindrical portion 70a was finished by polishing and grinding, and as shown in FIG. 9, the large diameter cylindrical portion 70a was ground by a cylindrical grinder to form the small diameter cylindrical portion 70b.
【００４５】共に、大径円筒部の外径がφ２．５ｍｍ、
小径円筒部の外径をφ１，２５ｍｍとして、全長１７ｍ
ｍとし、仕上げ面は平均算術表面粗さがＲａ０．０５に
なるようにした。In both cases, the outer diameter of the large-diameter cylindrical portion is φ2.5 mm,
The outer diameter of the small-diameter cylindrical part is φ1,25 mm, and the total length is 17 m.
m and the finished surface had an average arithmetic surface roughness of Ra0.05.
【００４６】同芯度の測定方法は、Ｖ溝上で大径円筒部
を回転させて、小径円筒部の振れを測定する方法を用い
た。The concentricity was measured by rotating the large-diameter cylindrical portion on the V groove and measuring the runout of the small-diameter cylindrical portion.
【００４７】その結果を表１に示す。The results are shown in Table 1.
【００４８】[0048]
【表１】 [Table 1]
【００４９】以上より、従来の径変換用フェルール７０
は１μｍを超えたサンプルが２０個中８個あったのに対
し、本発明の径変換用フェルール１０で１μｍを超えた
ものは発生しなかった。また、従来の径変換用フェルー
ル７０は平均値１．０４６μｍ、ばらつき０．４２８５
であったのに対し、本発明の径変換用フェルール１０で
は平均値０．５６１μｍ、ばらつき０．１６７３と安定
した精度の同芯度が得られた、From the above, the conventional ferrule 70 for diameter conversion is used.
There were 8 out of 20 samples having a diameter of more than 1 μm, whereas none of the ferrules for diameter conversion 10 of the present invention having a diameter of more than 1 μm occurred. Further, the conventional diameter conversion ferrule 70 has an average value of 1.046 μm and a variation of 0.4285.
On the other hand, in the diameter-converting ferrule 10 of the present invention, concentricity with a stable accuracy of an average value of 0.561 μm and a variation of 0.1673 was obtained,
【００５０】[0050]
【発明の効果】以上のように本発明によれば、長手方向
に貫通孔を有し片端に大径円筒部と他端に小径円筒部を
有する径変換用フェルールにおいて、小径フェルールを
長手方向の全長にわたり配置し、該小径フェルールの片
端側に円筒体を固定して大径円筒部を形成することによ
り、小径円筒部と貫通孔の同芯度及び大径円筒部と貫通
孔の同芯度を安定した小さな値にすることができる。As described above, according to the present invention, in the diameter converting ferrule having the through-hole in the longitudinal direction and having the large-diameter cylindrical portion at one end and the small-diameter cylindrical portion at the other end, the small-diameter ferrule is provided in the longitudinal direction. By arranging over the entire length and fixing a cylindrical body to one end side of the small diameter ferrule to form a large diameter cylindrical portion, concentricity between the small diameter cylindrical portion and the through hole and concentricity between the large diameter cylindrical portion and the through hole. Can be a stable small value.
【図１】本発明の径変換用フェルールを示す断面図であ
る。FIG. 1 is a cross-sectional view showing a ferrule for diameter conversion of the present invention.
【図２】（ａ）〜（ｅ）は本発明の径変換用フェルール
の一方端側のさまざまな実施形態を示す部分断面図であ
る。2A to 2E are partial cross-sectional views showing various embodiments of the one end side of the ferrule for diameter conversion of the present invention.
【図３】（ａ）〜（ｃ）は本発明の径変換用フェルール
の他方端側のさまざまな実施形態を示す部分断面図であ
る。3A to 3C are partial cross-sectional views showing various embodiments on the other end side of the ferrule for diameter conversion of the present invention.
【図４】本発明の径変換用フェルールの加工方法を示す
断面図である。FIG. 4 is a cross-sectional view showing a method for processing the ferrule for diameter conversion of the present invention.
【図５】本発明の径変換器を示す断面図である。FIG. 5 is a cross-sectional view showing a diameter converter of the present invention.
【図６】本発明の光レセプタクルを示す図である。FIG. 6 is a diagram showing an optical receptacle of the present invention.
【図７】従来の径変換器を示す断面図である。FIG. 7 is a cross-sectional view showing a conventional diameter converter.
【図８】従来の径変換用フェルールを示す断面図であ
る。FIG. 8 is a cross-sectional view showing a conventional diameter conversion ferrule.
【図９】従来の径変換用フェルールの加工方法を示す断
面図である。FIG. 9 is a cross-sectional view showing a method of processing a conventional ferrule for diameter conversion.
１ 小径フェルール １ａ 小径円筒部 １ｂ 貫通孔 １ｃ 端面 １ｄ C面部 １ｅ 一方端 １ｆ 他方端 ２ 円筒体 ２ａ 大径円筒部 １０ 径変換用フェルール ２１ チャック ２２ チャック ２３ 砥石 ３０ 径変換器 ３１ 光ファイバ ３２ 割スリーブ ３３ 割スリーブ ３４ ハウジング ３５ ハウジング ４０ 光レセプタクル ４１ 光ファイバ ４２ スリーブ ４３ ハウジング ７０ 径変換用フェルール ７０ａ 太径円筒部 ７０ｂ 細径円筒部 ７０ｃ 貫通孔 ７０ｄ 片端 ７０ｅ 他端 ７１ 光ファイバ ７２ 割スリーブ ７３ 割スリーブ ７４ チャック ７５ 心金 ７６ 砥石 ８０ 径変換器 1 Small diameter ferrule 1a Small diameter cylindrical part 1b through hole 1c end face 1d C plane 1e One end 1f other end 2 cylindrical body 2a Large diameter cylindrical part 10 Diameter conversion ferrule 21 chuck 22 chuck 23 whetstone 30 diameter converter 31 optical fiber 32% sleeve 33% sleeve 34 housing 35 housing 40 optical receptacle 41 optical fiber 42 sleeve 43 housing 70 Diameter conversion ferrule 70a Large diameter cylindrical part 70b Small diameter cylindrical part 70c through hole 70d one end 70e The other end 71 optical fiber 72% sleeve 73 split sleeve 74 chuck 75 Shinkin 76 whetstone 80 diameter converter
Claims (4)
の一方端側の外周に円筒体を固定して大径円筒部とし、
他方端側を小径円筒部としたことを特徴とする径変換用
フェルール。1. A large-diameter cylindrical portion is obtained by fixing a cylindrical body to the outer periphery of one end of a small-diameter ferrule having a through hole in the longitudinal direction,
A ferrule for diameter conversion, characterized in that the other end side is a small diameter cylindrical portion.
ら小径フェルールの端面が突出していることを特徴とす
る請求項１記載の径変換用フェルール。2. The ferrule for diameter conversion according to claim 1, wherein the end face of the small diameter ferrule projects from the end face of the cylindrical body on the side of the large diameter cylindrical portion.
たあと、一方端側の外周に円筒体を固定し、上記小径フ
ェルールの外周面を基準にして上記円筒体の外周面を仕
上加工することを特徴とする請求項１もしくは２のいず
れかに記載の径変換用フェルールの加工方法。3. Finishing the outer peripheral surface of the small diameter ferrule, fixing a cylindrical body to the outer periphery on one end side, and finishing the outer peripheral surface of the cylindrical body with reference to the outer peripheral surface of the small diameter ferrule. The method for processing a ferrule for diameter conversion according to claim 1 or 2, characterized in that:
ルの貫通孔に光ファイバを挿入固定し、両端面を光ファ
イバとともに研磨仕上げしたファイバスタブを径変換器
もしくは光レセプタクルに用いたことを特徴とする光部
品。4. A fiber stub in which an optical fiber is inserted and fixed in a through hole of the ferrule for diameter conversion according to claim 1 or 2 and both end faces of which are polished and finished is used for a diameter converter or an optical receptacle. A characteristic optical component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001293023A JP2003098380A (en) | 2001-09-26 | 2001-09-26 | Ferrule for diameter conversion, its machining method, and optical component using the ferrule |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001293023A JP2003098380A (en) | 2001-09-26 | 2001-09-26 | Ferrule for diameter conversion, its machining method, and optical component using the ferrule |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003098380A true JP2003098380A (en) | 2003-04-03 |
Family
ID=19114890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001293023A Pending JP2003098380A (en) | 2001-09-26 | 2001-09-26 | Ferrule for diameter conversion, its machining method, and optical component using the ferrule |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003098380A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024944A (en) * | 2005-07-12 | 2007-02-01 | Yonezawa Densen Kk | Optical fiber receptacle and its assembly method |
-
2001
- 2001-09-26 JP JP2001293023A patent/JP2003098380A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007024944A (en) * | 2005-07-12 | 2007-02-01 | Yonezawa Densen Kk | Optical fiber receptacle and its assembly method |
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