JP3531574B2 - Mold for molding and method of reinforcing optical fiber connection using the same - Google Patents
Mold for molding and method of reinforcing optical fiber connection using the sameInfo
- Publication number
- JP3531574B2 JP3531574B2 JP2000086786A JP2000086786A JP3531574B2 JP 3531574 B2 JP3531574 B2 JP 3531574B2 JP 2000086786 A JP2000086786 A JP 2000086786A JP 2000086786 A JP2000086786 A JP 2000086786A JP 3531574 B2 JP3531574 B2 JP 3531574B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- cavity
- mold
- optical fiber
- die
- Prior art date
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- Expired - Fee Related
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光ファイバ接続部
の補強樹脂被覆の成形に使用する成形用型及びそれを使
った光ファイバ接続部の補強方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die used for molding a reinforcing resin coating of an optical fiber connecting portion and a method for reinforcing an optical fiber connecting portion using the molding die.
【０００２】[0002]
【従来の技術】海底用光ファイバケーブル等に収納され
る光ファイバは長尺一連のものが必要である。長尺一連
の光ファイバが必要な場合、それよりも短い光ファイバ
を接続して長尺一連の光ファイバとしており、その光フ
ァイバの接続は通常次のようにして行っている。図５
は、光ファイバの接続部を説明するための斜視図であっ
て、図５（Ａ）は光ファイバ中のガラスファイバを融着
接続した状態を、図５（Ｂ）は接続部に補強樹脂被覆を
施した状態を示す。図５において、２１は光ファイバ、
２２はガラスファイバ、２３は融着接続箇所、２４は補
強樹脂被覆である。2. Description of the Related Art A long series of optical fibers is required to be housed in a submarine optical fiber cable or the like. When a long series of optical fibers is required, shorter optical fibers are connected to form a long series of optical fibers, and the connection of the optical fibers is usually performed as follows. Figure 5
FIG. 5A is a perspective view for explaining a connecting portion of an optical fiber, FIG. 5A shows a state in which glass fibers in the optical fiber are fusion-spliced, and FIG. 5B shows a reinforcing resin coating on the connecting portion. It shows the state of applying. In FIG. 5, 21 is an optical fiber,
22 is a glass fiber, 23 is a fusion splicing point, and 24 is a reinforcing resin coating.
【０００３】まず図５（Ａ）に示すように、２本の光フ
ァイバ２１の端部において光ファイバ２１の被覆を除去
して光ファイバ中のガラスファイバ２２を露出させ、２
本のガラスファイバ２２の端面同士を突合わせて融着接
続を行なう。なお、ガラスファイバ露出部の長さは２本
の光ファイバそれぞれでほぼ同じ長さとし、融着接続箇
所２３が接続されたガラスファイバ露出部のほぼ中央に
なるようにする。そして、図５（Ｂ）に示すように、ガ
ラスファイバ２２の露出部の上に樹脂成形を行なうこと
によって補強樹脂被覆２４を設ける。なお、この補強樹
脂被覆２４部分の外径は光ファイバ２１の外径とほぼ同
じになるようにして、光ファイバケーブル中への光ファ
イバの収納に当たって、接続部の大きさが特に支障を来
さないようにする。First, as shown in FIG. 5 (A), the coating of the optical fiber 21 is removed at the ends of the two optical fibers 21 to expose the glass fibers 22 in the optical fibers.
The end faces of the glass fibers 22 of the book are abutted with each other to perform fusion splicing. The length of the glass fiber exposed portion is set to be substantially the same for each of the two optical fibers so that the fusion splicing point 23 is located approximately in the center of the connected glass fiber exposed portion. Then, as shown in FIG. 5B, the reinforcing resin coating 24 is provided on the exposed portion of the glass fiber 22 by resin molding. The outer diameter of the reinforcing resin coating 24 is set to be substantially the same as the outer diameter of the optical fiber 21, so that the size of the connecting portion causes a problem when the optical fiber is stored in the optical fiber cable. Try not to.
【０００４】光ファイバ２１の被覆が紫外線硬化型樹脂
で形成されている場合は、補強樹脂被覆２４も通常紫外
線硬化型樹脂を硬化させたもので形成する。また、この
補強樹脂被覆の形成は次のようにして行っている。図６
はその補強樹脂被覆の形成に使用する成形用型と成形方
法を説明する図であって、図６（Ａ）は上型のパーテイ
ング面側から見た平面図、図６（Ｂ）は上型の側面図、
図６（Ｃ）は下型のパーテイング面側からみた平面図、
図６（Ｄ）は下型の側面図、図６（Ｅ）は成形状態を示
す正面図、図６（Ｆ）はその側面図である。When the coating of the optical fiber 21 is formed of an ultraviolet curable resin, the reinforcing resin coating 24 is also usually formed by curing the ultraviolet curable resin. The formation of this reinforcing resin coating is performed as follows. Figure 6
6A and 6B are views for explaining a molding die and a molding method used to form the reinforcing resin coating, FIG. 6A is a plan view seen from the parting surface side of the upper die, and FIG. 6B is an upper die. Side view of
FIG. 6 (C) is a plan view of the lower die as seen from the side of the parting surface,
6 (D) is a side view of the lower mold, FIG. 6 (E) is a front view showing a molding state, and FIG. 6 (F) is a side view thereof.
【０００５】図６において、２５は成形用型、２５ａは
上型、２５ｂは下型、２６ａ、２６ｂはパーテイング
面、２６ｃ、２６ｄは溝状部、２７はキャビテイ、２８
は樹脂注入ゲート、２９はランナー、３０はスプル、３
１は光ファイバ、３２はガラスファイバ、３３は紫外線
である。In FIG. 6, 25 is a molding die, 25a is an upper die, 25b is a lower die, 26a and 26b are parting surfaces, 26c and 26d are groove portions, 27 is a cavity, and 28 is a cavity.
Is a resin injection gate, 29 is a runner, 30 is a sprue, 3
1 is an optical fiber, 32 is a glass fiber, and 33 is an ultraviolet ray.
【０００６】図６に示す成形用型２５は、上型２５ａと
下型２５ｂとからなる。上型２５ａには図６（Ａ）
（Ｂ）に示す通り、パーテイング面２６ａに沿って直線
状の横断面半円形の溝状部２６ｃが形成されており、そ
の溝状部２６ｃに連通する樹脂注入ゲート２８とそれに
つながるランナー２９及びスプル３０を有している。ま
た、下型２５ｂには図６（Ｃ）（Ｄ）に示す通り、パー
テイング面２６ｂに沿って直線状の横断面半円形の溝状
部２６ｄが形成されている。なお、上型２５ａの溝状部
２６ｃと下型２５ｂの溝状部２６ｄとは、パーテイング
面２６ａと２６ｂとを対向させて型締めした時、溝状部
２６ｃと溝状部２６ｄとで横断面円形のキャビテイ２７
が形作られるように位置を合わせている。また、溝状部
２６ｃ、２６ｄの内径、即ちキャビテイ２７の内径は一
般には約２５０μｍである。The molding die 25 shown in FIG. 6 comprises an upper die 25a and a lower die 25b. FIG. 6A shows the upper mold 25a.
As shown in (B), a linear groove section 26c having a semicircular cross section is formed along the parting surface 26a, and a resin injection gate 28 communicating with the groove section 26c and a runner 29 and sprue connected thereto. Has 30. Further, as shown in FIGS. 6C and 6D, the lower mold 25b is provided with a linear groove-shaped portion 26d having a semicircular cross section along the parting surface 26b. The groove-like portion 26c of the upper die 25a and the groove-like portion 26d of the lower die 25b are cross-sectioned by the groove-like portion 26c and the groove-like portion 26d when the molding surfaces 26a and 26b are opposed to each other. Circular cavity 27
Are aligned so that they are shaped. The inner diameter of the groove portions 26c and 26d, that is, the inner diameter of the cavity 27 is generally about 250 μm.
【０００７】また、成形用型２５の上型２５ａ及び下型
２５ｂは紫外線が透過するように石英ガラスで作ってい
る。なお、図６（Ａ）（Ｂ）（Ｃ）（Ｄ）では、それぞ
れガラスファイバ３２の露出部を有する光ファイバ３１
を溝状部に挿入したところを併せて想像線で描いてい
る。なお、挿入される光ファイバ３１の外径は通常約２
４５μｍ、ガラスファイバ３２の外径は約１２５μｍで
ある。The upper die 25a and the lower die 25b of the molding die 25 are made of quartz glass so that ultraviolet rays can pass therethrough. In FIGS. 6A, 6B, 6C, and 6D, the optical fiber 31 having the exposed portion of the glass fiber 32 is provided.
The imaginary line is drawn together with the insertion of the into the groove. The outer diameter of the optical fiber 31 to be inserted is usually about 2
45 μm, the outer diameter of the glass fiber 32 is about 125 μm.
【０００８】図６（Ａ）（Ｂ）（Ｃ）（Ｄ）に示す成形
用型２５を使って、光ファイバ３１の接続部に補強樹脂
被覆の成形を行なうには次のようにする。２本の光ファ
イバ３１の端部において被覆を除去してガラスファイバ
３２を露出させ、ガラスファイバ３２の端面同士を融着
接続したものを、図６（Ｅ）（Ｆ）に示すように溝状部
２６ｃ、２６ｄで作られるキャビテイ２７内に挿入して
上型２５ａと下型２５ｂとを型締めする。そして、スプ
ル３０からランナー２９及び樹脂注入ゲート２８を通し
て紫外線硬化型樹脂をキャビテイ２７内のガラスファイ
バ３２の周囲の空洞部に注入する。そして、紫外線３３
を下型２５ｂの下方から下型２５ｂに向かって照射し、
下型２５ｂを通過した紫外線でもって、注入した紫外線
硬化型樹脂を硬化させる。The molding die 25 shown in FIGS. 6A, 6B, 6C, and 6D is used to mold the reinforcing resin coating on the connecting portion of the optical fiber 31 as follows. The coating is removed at the end portions of the two optical fibers 31 to expose the glass fibers 32, and the end faces of the glass fibers 32 are fusion-spliced into a groove shape as shown in FIGS. 6 (E) and 6 (F). The upper mold 25a and the lower mold 25b are clamped by inserting them into the cavity 27 made of the parts 26c and 26d. Then, the ultraviolet curable resin is injected into the cavity around the glass fiber 32 in the cavity 27 from the sprue 30 through the runner 29 and the resin injection gate 28. And ultraviolet 33
Is irradiated from below the lower mold 25b toward the lower mold 25b,
The injected UV curable resin is cured by the UV light that has passed through the lower mold 25b.
【０００９】[0009]
【発明が解決しようとする課題】ところで、樹脂注入ゲ
ート２８からキャビテイ２７内のガラスファイバの周囲
の空洞部に入った樹脂は、キャビテイ２７内の長手方向
両側に向かって流れ、光ファイバ３１の被覆際までの空
洞部を充填する。この時、光ファイバ３１の外径は約２
４５μｍで溝状部２６ｃ、２６ｄの内径は約２５０μｍ
なので、光ファイバの表面と溝状部２６ｃ、２６ｄの内
壁面との間にはわずかな隙間がある。通常ならば、紫外
線硬化型樹脂の注入によって、光ファイバの被覆際に追
い込まれた空気は、その隙間を通して外部に追い出され
るので、紫外線硬化型樹脂は光ファイバ３１の被覆際ま
で完全に充填される。また、紫外線硬化型樹脂の一部は
光ファイバ３１の被覆と溝状部２６ｃ、２６ｄとの隙間
にまで達すが、その隙間はごくわずかで、樹脂は粘性を
有しているので、光ファイバ３１の被覆の上に沿って成
形用型２５の外にまで出ることはなく、隙間への樹脂進
入はせいぜい数ｍｍである。By the way, the resin that has entered the hollow portion around the glass fiber in the cavity 27 from the resin injection gate 28 flows toward both sides in the longitudinal direction in the cavity 27, and covers the optical fiber 31. Fill the cavity up to the end. At this time, the outer diameter of the optical fiber 31 is about 2
The inner diameter of the groove portions 26c and 26d is about 250 μm at 45 μm.
Therefore, there is a slight gap between the surface of the optical fiber and the inner wall surfaces of the groove portions 26c and 26d. Normally, the air injected during the coating of the optical fiber by the injection of the ultraviolet curable resin is expelled to the outside through the gap, so that the ultraviolet curable resin is completely filled until the optical fiber 31 is covered. . Further, a part of the ultraviolet curable resin reaches the gap between the coating of the optical fiber 31 and the groove portions 26c and 26d, but the gap is very small and the resin has viscosity, so that the optical fiber 31 The resin does not come out of the molding die 25 along the top of the coating, and the resin penetration into the gap is several mm at most.
【００１０】しかし、光ファイバ３１の外径変動等によ
って、光ファイバと溝状部の内壁面との隙間が狭くなっ
ている場合は、その隙間から空気が完全に追い出されな
いこともある。その場合は、両側の光ファイバ３１の被
覆際に空気が残留して補強樹脂被覆の両端部近くに気泡
が生じる。また、紫外線硬化型樹脂は、図示しない樹脂
供給装置からスプル３０、ランナー２９、樹脂注入ゲー
ト２８を通ってキャビテイ２７内に注入するが、その流
れの途中で樹脂流の先端部分には空気が巻込まれて先端
部分の樹脂は気泡を含んだ状態になることがある。ま
た、この樹脂流の先端部分は被覆端際に充填されるの
で、被覆端際には追い出されずに残留した空気から出来
た気泡以外に樹脂中に巻込まれた空気による気泡も生じ
易い。However, if the gap between the optical fiber and the inner wall surface of the groove portion is narrowed due to fluctuations in the outer diameter of the optical fiber 31, air may not be completely expelled from the gap. In that case, air remains when the optical fibers 31 on both sides are coated, and bubbles are generated near both ends of the reinforcing resin coating. Further, the ultraviolet curable resin is injected into the cavity 27 from a resin supply device (not shown) through the sprue 30, the runner 29, and the resin injection gate 28, and air is entrained in the tip portion of the resin flow during the flow. As a result, the resin at the tip may contain bubbles. Further, since the tip portion of the resin flow is filled near the coating end, air bubbles caused by the air entrained in the resin are likely to be generated in addition to the air bubbles formed from the air that was not driven out at the coating end.
【００１１】光ファイバを海底用光ファイバケーブル内
に収納して使用した場合、光ファイバは大きな側圧を受
けることになるが、補強樹脂被覆の内部に気泡があると
その側圧によって気泡が縮小して補強樹脂被覆が変形し
中のガラスファイバに曲げを与えて光ファイバの伝送損
失を増大させることがある。従って、補強樹脂被覆内は
気泡が無いことが望まれる。When the optical fiber is used by being housed in the optical fiber cable for the seabed, the optical fiber is subjected to a large lateral pressure, but if there is a bubble inside the reinforcing resin coating, the bubble shrinks due to the lateral pressure. The reinforcing resin coating may be deformed to bend the glass fiber inside and increase the transmission loss of the optical fiber. Therefore, it is desired that there be no bubbles in the reinforcing resin coating.
【００１２】また、上型２５ａ及び下型２５ｂは石英ガ
ラスで出来ており、型締め時の締付け圧力を金属製金型
の場合ほど大きく出来ないので、型締めした時において
もパーテイング面２６ａと２６ｂとの間にはわずかな隙
間が生じることがある。そして、その隙間に沿って紫外
線硬化型樹脂が沁み込み、そのまま硬化すると補強樹脂
被覆の表面に対して垂直な方向に延びる固くなった鰭状
体が出来ることがある。この補強樹脂被覆の表面に付着
した鰭状体は、接続された光ファイバの上に更に外部被
覆を設ける等の作業を行なう上で障害となるので、その
鰭状体を削り取る必要がある。通常、鰭状体の削り取り
は剃刀で削ぐことによって行なっているが、丁寧に作業
を行なう必要があり相当の手間がかかる。Further, since the upper mold 25a and the lower mold 25b are made of quartz glass, the tightening pressure at the time of mold clamping cannot be made as large as that of the metal mold, so that the parting surfaces 26a and 26b can be made even when the mold is clamped. There may be a slight gap between and. Then, the ultraviolet curable resin penetrates along the gap, and if it is cured as it is, a hard fin-like body extending in a direction perpendicular to the surface of the reinforcing resin coating may be formed. The fin-like body adhered to the surface of the reinforcing resin coating becomes an obstacle in performing work such as further providing an outer coating on the connected optical fiber, and therefore it is necessary to scrape off the fin-like body. Usually, the fin-shaped body is scraped off by shaving with a razor, but it requires a careful work and takes a lot of time and effort.
【００１３】本発明は、光ファイバ接続部における補強
樹脂被覆内に気泡が残留しないようにした成形用型及び
それを用いた光ファイバ接続部の補強方法を提供するも
のである。また、併せて補強樹脂被覆の表面に鰭状体が
生じないようにすることが出来る成形用型を提供するも
のである。The present invention provides a mold for preventing bubbles from remaining in the reinforcing resin coating in the optical fiber connecting portion, and a method for reinforcing the optical fiber connecting portion using the molding die. Further, the present invention also provides a molding die capable of preventing the formation of fin-like bodies on the surface of the reinforcing resin coating.
【００１４】[0014]
【課題を解決するための手段】本発明の線状体の再被覆
用の紫外線硬化型樹脂被覆成形用型は、少なくとも一方
は紫外線を透過する材料からなる上型と下型とで構成さ
れた成形用型であって、該上型と下型のそれぞれのパー
テイング面に沿って直線状に貫通して形成された横断面
半円形の溝状部によって形作られるキャビテイを有し、
樹脂注入ゲートが、線状体上の被覆が除去された部分に
相当する所定の間隔を有し、前記キャビティの長手方向
の２個所に設けられており、樹脂排出ゲートが前記２個
所の樹脂注入ゲートの中央の前記キャビティに設けられ
ているものである。Recoating of the linear body of the present invention
A UV-curable resin-coated molding die for use in molding is a molding die composed of an upper mold and a lower mold, at least one of which is made of a material that transmits ultraviolet rays, and the respective molding surfaces of the upper mold and the lower mold. Having a cavity formed by a groove having a semicircular cross section formed linearly along
The resin injection gate is placed in the area where the coating on the linear body has been removed.
With a corresponding predetermined spacing, in the longitudinal direction of the cavity
The two resin discharge gates are provided at two locations
The resin injection gate is provided in the center of the cavity .
【００１５】２本の光ファイバの端部においてそれぞれ
被覆を除去して露出したガラスファイバの端面同士を突
合わせて融着接続を行ったガラスファイバ露出部を含む
光ファイバ部分を上記の成形用型のキャビテイ内に挿入
して、ガラスファイバ露出部両側の被覆端近傍に位置さ
せた２つの樹脂注入ゲートから、前記キャビテイ内のガ
ラスファイバ周囲の空洞部に紫外線硬化型樹脂を注入
し、しかる後成形用型の外方から前記紫外線透過材料か
らなる側の型を通して紫外線を照射し、前記キャビテイ
内に注入された紫外線硬化型樹脂を硬化させることによ
って光ファイバ接続部の補強樹脂被覆の形成を行なえ
ば、樹脂は光ファイバの被覆端側から中央に向かって流
れ、空気及び樹脂流の先端部分は樹脂排出ゲートから外
部に追い出されるので、補強樹脂被覆内の気泡発生を無
くすることが出来る。The above-mentioned molding die is used to form an optical fiber portion including an exposed portion of the glass fiber in which the coating is removed at the end portions of the two optical fibers and the exposed end surfaces of the glass fiber are butted against each other to perform fusion splicing. Of the UV-curable resin is injected into the cavity around the glass fiber in the cavity from two resin injection gates located near the coating ends on both sides of the exposed glass fiber, and then molded. If the ultraviolet ray is irradiated from the outside of the working die through the die on the side made of the ultraviolet ray transmitting material, and the ultraviolet ray curable resin injected into the cavity is cured to form the reinforcing resin coating of the optical fiber connecting portion. , The resin flows from the coated end side of the optical fiber toward the center, and the tips of the air and the resin flow are expelled from the resin discharge gate to the outside. It can be eliminated bubble generation in the reinforcing resin coating.
【００１６】また併せて、上型と下型のうち紫外線透過
材料からなる少なくとも一方の型のパーテイング面に
は、２箇所の樹脂注入ゲートを含む区間の前記溝状部を
取り囲むパーテイング面部分であって、前記溝状部を除
く部分に遮光膜層を設けて、かつ、前記樹脂注入ゲート
及び前記樹脂排出ゲート及びそれらのゲートに連通する
ランナーを他方の型のみに設けることにすれば、上型と
下型のパーテイング面の隙間に入った紫外線硬化型樹脂
及び樹脂注入ゲート及び樹脂排出ゲートにつながるラン
ナー内の紫外線硬化型樹脂には紫外線が照射されない。
従って、その部分の樹脂は未硬化の状態で成形用型から
取出すことが出来るので、その部分を布等で拭うことに
よって未硬化樹脂の部分を簡単に除去することが出来
る。従って、もしも上型と下型のパーテイング面に隙間
に樹脂が入ったとしても、その樹脂が硬化してしまうこ
とがないため、補強樹脂被覆に鰭状体が生じることはな
い。本手続補正書は、平成１５年１２月１６日付起案、
平成１５年１２月２４日付発送の拒絶理由通知に対する
意見書に代わるものとする。Further in addition, the upper mold and parting surface of at least one mold made of an ultraviolet permeation material of the lower mold, the groove portion of the section including the resin injection gate in two places
It is the parting surface that surrounds the groove-shaped part.
If a light-shielding film layer is provided in the closed part and the resin injection gate, the resin discharge gate, and the runners communicating with these gates are provided only in the other mold, the patterning surfaces of the upper mold and the lower mold are The ultraviolet curable resin in the gap and the ultraviolet curable resin in the runner connected to the resin injection gate and the resin discharge gate are not irradiated with ultraviolet rays.
Therefore, the resin in that portion can be taken out from the molding die in an uncured state, so that the portion of the uncured resin can be easily removed by wiping the portion with a cloth or the like. Therefore, even if the resin enters the gap between the upper and lower mold parting surfaces, the resin does not harden, so that the reinforcing resin coating does not have a fin-like body. This Procedural Amendment was drafted on December 16, 2003,
It replaces the written opinion for the notification of reasons for refusal of shipment on December 24, 2003.
【００１７】[0017]
【発明の実施の形態】図１は、本発明の成形用型の実施
形態を示す図であって、図１（Ａ）は上型のパーテイン
グ面側から見た平面図、図１（Ｂ）は上型の側面図、図
１（Ｃ）は下型のパーテイング面側から見た平面図、図
１（Ｄ）は下型の側面図である。図１において、１は成
形用型、１ａは上型、１ｂは下型、２ａ、２ｂはパーテ
イング面、２ｃ、２ｄは溝状部、３はキャビテイ、４は
樹脂注入ゲート、５はランナー、６はスプル、７は樹脂
排出ゲート、８はランナー、９は樹脂排出孔、１０は光
ファイバ、１１はガラスファイバである。1 is a diagram showing an embodiment of a molding die of the present invention, FIG. 1 (A) is a plan view seen from the parting surface side of the upper die, FIG. 1 (B). Is a side view of the upper mold, FIG. 1 (C) is a plan view of the lower mold seen from the parting surface side, and FIG. 1 (D) is a side view of the lower mold. In FIG. 1, 1 is a molding die, 1a is an upper die, 1b is a lower die, 2a and 2b are parting surfaces, 2c and 2d are groove portions, 3 is a cavity, 4 is a resin injection gate, 5 is a runner, 6 Is a sprue, 7 is a resin discharge gate, 8 is a runner, 9 is a resin discharge hole, 10 is an optical fiber, and 11 is a glass fiber.
【００１８】成形用型１は、上型１ａと下型１ｂとから
なり、少なくとも下型１ｂは石英ガラス等の紫外線を透
過する材料で形成する。熱膨張等の性質を考慮すれば、
上型１ａ及び下型１ｂは同じ材質で形成することが望ま
しい。また、上型１ａと下型１ｂとは上下の位置関係を
示す言葉ではなく単に割り型の一方の型と他方の型を区
別するために使用している言葉であるので、上型及び下
型を上下反対に配置しても、また左右に配置してもかま
わない。また、上型１ａのパーテイング面２ａに沿って
直線状の横断面半円形の溝状部２ｃを設け、その溝状部
２ｃに連通するように２つの樹脂注入ゲート４とその中
央に１つの樹脂排出ゲート７を設ける。The molding die 1 comprises an upper die 1a and a lower die 1b, and at least the lower die 1b is made of a material such as quartz glass that transmits ultraviolet rays. Considering properties such as thermal expansion,
It is desirable that the upper mold 1a and the lower mold 1b are made of the same material. Further, since the upper mold 1a and the lower mold 1b are not words indicating the upper and lower positional relationship but are simply used to distinguish one mold of the split mold from the other mold, the upper mold and the lower mold May be arranged upside down or left and right. Further, a linear groove portion 2c having a semicircular cross section is provided along the parting surface 2a of the upper die 1a, and two resin injection gates 4 are provided so as to communicate with the groove portion 2c and one resin is provided at the center thereof. A discharge gate 7 is provided.
【００１９】そして、樹脂注入ゲート４に連通してラン
ナー５及びスプル６を、樹脂排出ゲート７に連通してラ
ンナー８及び樹脂排出孔９を設ける。また、下型１ｂの
パーテイング面２ｂに沿って直線状の横断面半円形の溝
状部２ｄを設ける。また、上型１ａ及び下型１ｂのパー
テイング面２ａ、２ｂ同士を向合わせて型締めした時
に、上型１ａの溝状部２ｃの位置と下型１ｂの溝状部２
ｄの位置とは対向するように位置を合わせる。またその
時、溝状部２ｃ及び２ｄで形作られる横断面円形の孔を
キャビテイ３とする。なお、成形対象となる光ファイバ
の外径が約２４５μｍの場合、キャビテイ３の内径が約
２５０μｍとなるように成形対象光ファイバの外径より
も溝状部２ｃ及び２ｄの内径が数μｍ程度大きくなるよ
うに溝状部２ｃ及び２ｄを形成する。A runner 5 and a sprue 6 are provided in communication with the resin injection gate 4, and a runner 8 and a resin discharge hole 9 are provided in communication with the resin discharge gate 7. Further, a linear groove portion 2d having a semicircular cross section is provided along the parting surface 2b of the lower die 1b. Moreover, when the upper mold 1a and the lower mold 1b are clamped with the facing surfaces 2a, 2b facing each other, the position of the groove 2c of the upper mold 1a and the groove 2 of the lower mold 1b.
The position is adjusted so as to face the position of d. At that time, a hole having a circular cross section formed by the groove portions 2c and 2d is referred to as a cavity 3. When the outer diameter of the optical fiber to be molded is about 245 μm, the inner diameters of the grooves 2c and 2d are about several μm larger than the outer diameter of the optical fiber to be molded so that the inner diameter of the cavity 3 is about 250 μm. The groove portions 2c and 2d are formed so that
【００２０】この成形用型２５を使用して補強樹脂被覆
の成形を行なう場合には、図１（Ａ）（Ｂ）（Ｃ）
（Ｄ）の想像線で示すようにキャビテイ３内に光ファイ
バ１０を挿入するので、挿入が想定される光ファイバの
被覆位置等に合わせて樹脂注入ゲート４及び樹脂排出ゲ
ートを設ける。即ち、図１（Ａ）（Ｃ）に示すように、
２つの樹脂注入ゲートは、それぞれ挿入が想定される光
ファイバの被覆端近傍に位置させる。具体例としては、
光ファイバ接続部におけるガラスファイバ１１の露出長
が約９ｍｍの場合、２つの樹脂注入ゲート４の中心間隔
は約９ｍｍ〜１０ｍｍとする。In the case of molding the reinforcing resin coating using this molding die 25, as shown in FIGS. 1 (A) (B) (C).
Since the optical fiber 10 is inserted into the cavity 3 as shown by the imaginary line in (D), the resin injection gate 4 and the resin discharge gate are provided in accordance with the coating position of the optical fiber which is supposed to be inserted. That is, as shown in FIGS. 1 (A) and 1 (C),
The two resin injection gates are located near the coated end of the optical fiber that is supposed to be inserted. As a specific example,
When the exposed length of the glass fiber 11 in the optical fiber connecting portion is about 9 mm, the center interval between the two resin injection gates 4 is about 9 mm to 10 mm.
【００２１】２つの樹脂注入ゲート４の中心間隔をガラ
スファイバの露出長に合わせて９ｍｍとして、それぞれ
の樹脂注入ゲート４を光ファイバ１０の被覆端位置に一
致させても良いが、２つの樹脂注入ゲート４の中心間隔
をそれよりも少し大きく約１０ｍｍとして、被覆端から
被覆側に約０．５ｍｍ程度入った箇所に樹脂注入ゲート
４を設けることがより好ましい。この場合、樹脂注入ゲ
ート４から注入された樹脂は、樹脂注入ゲート４と光フ
ァイバの被覆端との距離が０．５ｍｍ程度であるので、
光ファイバ１０の被覆と溝状部２ｃ、２ｄの内壁面との
間の隙間を通って、樹脂はガラスファイバ１１の露出部
の周囲に向かって流れ込む。またそれによって、光ファ
イバのガラスファイバ露出長に少しのばらつきがあって
も被覆端の際まで確実に樹脂を充填し、かつ０．５ｍｍ
程度の被覆に樹脂が被さった部分を形成することが出来
る。The center distance between the two resin injection gates 4 may be set to 9 mm in accordance with the exposed length of the glass fiber, and each resin injection gate 4 may be aligned with the coating end position of the optical fiber 10. It is more preferable that the center spacing of the gates 4 is slightly larger than that and about 10 mm, and that the resin injection gate 4 is provided at a position about 0.5 mm from the coating end to the coating side. In this case, in the resin injected from the resin injection gate 4, the distance between the resin injection gate 4 and the coated end of the optical fiber is about 0.5 mm,
The resin flows toward the periphery of the exposed portion of the glass fiber 11 through the gap between the coating of the optical fiber 10 and the inner wall surfaces of the groove portions 2c and 2d. Also, by doing so, even if there is a slight variation in the exposed length of the glass fiber of the optical fiber, the resin is surely filled up to the coated end and 0.5 mm
It is possible to form a portion in which the resin is covered by a certain degree of coating.
【００２２】また、樹脂排出ゲート７は２つの樹脂注入
ゲート４の中央に設ける。また、ランナー５及び８はそ
れぞれ樹脂注入ゲート４又は樹脂排出ゲート７に連通す
るようにパーテイング面２ａに沿って設け、紫外線硬化
型樹脂を注入するためのスプル６又は排出するための樹
脂排出孔９に連通させる。また、ランナー５及び８の位
置、スプル６及び樹脂排出孔９の位置は図１（Ａ）に限
るものではない。また、図１（Ａ）では樹脂注入ゲート
４を配置した側と樹脂排出ゲートを配置した側を溝状部
２ｃに対して反対側としているが同じ側でも良い。ま
た、樹脂排出ゲート７、ランナー８、樹脂排出穴９のサ
イズは、樹脂の粘度等を考慮してキャビテイ３内へ注入
する樹脂の圧力が小さくなりすぎないように適当な大き
さに選定する。The resin discharge gate 7 is provided at the center of the two resin injection gates 4. Further, the runners 5 and 8 are provided along the parting surface 2a so as to communicate with the resin injection gate 4 or the resin discharge gate 7, respectively, and the sprue 6 for injecting the ultraviolet curable resin or the resin discharge hole 9 for the discharge is provided. Communicate with. Further, the positions of the runners 5 and 8 and the positions of the sprue 6 and the resin discharge hole 9 are not limited to those shown in FIG. Further, in FIG. 1A, the side on which the resin injection gate 4 is arranged and the side on which the resin discharge gate is arranged are opposite to the groove-shaped portion 2c, but they may be the same side. The sizes of the resin discharge gate 7, the runner 8, and the resin discharge hole 9 are selected in consideration of the viscosity of the resin and the like so that the pressure of the resin injected into the cavity 3 does not become too small.
【００２３】図２は、図１に示す成形用型を使って補強
樹脂被覆の成形を行なっているところを示す図であっ
て、図２（Ａ）は正面図、図２（Ｂ）は側面図である。
また、図３は成形後の光ファイバ接続部を示す正面図で
ある。また、図２、図３において、図１と同じ符号は同
じものを示す。図２、図３において、１２は紫外線、１
３は補強樹脂被覆である。2A and 2B are views showing that the reinforcing resin coating is molded using the molding die shown in FIG. 1. FIG. 2A is a front view and FIG. 2B is a side view. It is a figure.
Further, FIG. 3 is a front view showing the optical fiber connecting portion after molding. Further, in FIGS. 2 and 3, the same reference numerals as those in FIG. 1 indicate the same components. In FIG. 2 and FIG. 3, 12 is ultraviolet light, 1
3 is a reinforcing resin coating.
【００２４】光ファイバ接続部の補強樹脂被覆の形成に
当たっては、ガラスファイバ１２の端面同士を融着接続
した部分を含む光ファイバ１０の部分を上型１ａと下型
１ｂとの溝状部２ｃ、２ｄで形作られるキャビテイ３内
に挿入して上型１ａ及び下型１ｂを型締めする。そし
て、スプル６からランナー５、樹脂注入ゲート４を通し
て紫外線硬化型樹脂をキャビテイ３内のガラスファイバ
１１の周囲の空洞部に注入する。それによって、ガラス
ファイバ１１の周辺にあった空気及び樹脂流の先端部分
の樹脂を樹脂排出ゲート７からランナー８及び樹脂排出
孔９を通じて排出する。紫外線硬化型樹脂が十分にガラ
スファイバの周囲に充填された時点で、下型１ｂの下方
から下型１ｂに向かって紫外線１２を照射し、下型１ｂ
を透過して充填された紫外線硬化型樹脂に到達した紫外
線でもって樹脂を硬化させる。In forming the reinforcing resin coating on the optical fiber splicing portion, the portion of the optical fiber 10 including the portion where the end faces of the glass fiber 12 are fusion-spliced together is formed into a groove portion 2c between the upper die 1a and the lower die 1b. The upper mold 1a and the lower mold 1b are clamped by being inserted into the cavity 3 formed by 2d. Then, the ultraviolet curable resin is injected from the sprue 6 through the runner 5 and the resin injection gate 4 into the cavity around the glass fiber 11 in the cavity 3. As a result, the air and the resin at the tip of the resin flow around the glass fiber 11 are discharged from the resin discharge gate 7 through the runner 8 and the resin discharge hole 9. When the ultraviolet curable resin is sufficiently filled around the glass fiber, the ultraviolet rays 12 are irradiated from below the lower mold 1b toward the lower mold 1b, and the lower mold 1b is irradiated.
The resin is cured by the ultraviolet rays that have reached the filled ultraviolet-curing resin.
【００２５】図３に示す通り、光ファイバ接続部では、
光ファイバ１０のガラスファイバ１１の露出部は紫外線
硬化型樹脂からなる補強樹脂被覆１３でもって覆われ
る。光ファイバ１０の外径が約２４５μｍであるのに対
して、補強樹脂被覆の外径は約２５０μｍとなるが、そ
の外径差は極くわずかであるので、接続された光ファイ
バへの外部被覆の加工あるいは光ファイバケーブル内へ
の光ファイバの収納に当たって光ファイバ接続部の大き
さが支障になることはない。また、光ファイバ１０の被
覆端には約０．５ｍｍ程度の長さにわたって光ファイバ
１０の被覆上に補強樹脂被覆１３が被さった部分が出来
る。この被さった部分を作ることによって、光ファイバ
の接続部を曲げても補強樹脂被覆１３と光ファイバ１０
の被覆端に隙間が生じることはない。なお、この被さっ
た部分の補強樹脂被覆の厚さは１μｍ以上あれば良い。As shown in FIG. 3, in the optical fiber connection part,
The exposed portion of the glass fiber 11 of the optical fiber 10 is covered with a reinforcing resin coating 13 made of an ultraviolet curable resin. While the outer diameter of the optical fiber 10 is about 245 μm, the outer diameter of the reinforcing resin coating is about 250 μm, but the difference in outer diameter is very small, so the outer coating on the connected optical fiber is small. There is no hindrance to the size of the optical fiber connecting portion when processing the above or storing the optical fiber in the optical fiber cable. Further, the coated end of the optical fiber 10 has a portion where the reinforcing resin coating 13 is covered on the coating of the optical fiber 10 over a length of about 0.5 mm. By forming the covered portion, the reinforcing resin coating 13 and the optical fiber 10 can be formed even if the connecting portion of the optical fiber is bent.
There is no gap at the coated end of the. The thickness of the covering portion of the reinforcing resin may be 1 μm or more.
【００２６】図４は、成形用型の下型に遮光膜層を設け
た例を示す下型の平面図である。図４において、１４は
遮光膜層である。また、図４では想像線にて樹脂注入ゲ
ート４、ランナー５、スプル６、樹脂排出ゲート７、ラ
ンナー８、樹脂排出孔９を描いているが、これらは下型
１ｂに設けたものではない。それらは、図４に示す下型
１ｂ上に、図１（Ａ）（Ｂ）に示す上型１ａを載せて型
締めした時に、樹脂注入ゲート４等が位置する箇所と図
４において設ける遮光膜層１４が位置する箇所との関係
が明確になるように描いた想像図である。FIG. 4 is a plan view of the lower mold showing an example in which a light shielding film layer is provided on the lower mold of the molding die. In FIG. 4, 14 is a light shielding film layer. Further, in FIG. 4, the resin injection gate 4, the runner 5, the sprue 6, the resin discharge gate 7, the runner 8, and the resin discharge hole 9 are drawn by imaginary lines, but these are not provided in the lower mold 1b. These are a light-shielding film provided in FIG. 4 and a position where the resin injection gate 4 is located when the upper mold 1a shown in FIGS. 1A and 1B is placed on the lower mold 1b shown in FIG. It is an imaginary drawing drawn so that the relationship with the position where the layer 14 is located becomes clear.
【００２７】図４に示す通り遮光膜層１４は、下型１ｂ
のパーテイング面２ｂに沿ってパーテイング面２ｂの一
部分に設ける。遮光膜層１４は紫外線を遮光するアルミ
ニウム等の金属膜又は二酸化珪素（ＳｉＯ2）と酸化チ
タン（ＴｉＯ2）、二酸化珪素（ＳｉＯ2）と酸化タンタ
ル（Ｔ2Ｏ5）等の誘電体の多層膜であって、スパッタリ
ング、真空蒸着等によって設ける。なお、厚さは数μｍ
とする。誘電体多層膜をパーテイング面上に形成するこ
とによって、密着強度の強い膜を形成することが出来、
成形用型の繰り返し型締めによっても剥がれないように
することが出来る。また、誘電体多層膜の各層の材質と
各層の厚さを調整することによって紫外線の透過を阻止
する遮光膜層とすることが出来る。As shown in FIG. 4, the light-shielding film layer 14 includes the lower mold 1b.
It is provided on a part of the parting surface 2b along the parting surface 2b. The light-shielding film layer 14 is a metal film of aluminum or the like which shields ultraviolet rays, or a multilayer of dielectrics such as silicon dioxide (SiO 2 ) and titanium oxide (TiO 2 ), or silicon dioxide (SiO 2 ) and tantalum oxide (T 2 O 5 ). The film is provided by sputtering, vacuum deposition, or the like. The thickness is several μm.
And By forming the dielectric multi-layered film on the parting surface, a film with high adhesion strength can be formed,
It is possible to prevent the molding die from being peeled off by repeated clamping. Further, by adjusting the material of each layer and the thickness of each layer of the dielectric multilayer film, it is possible to form a light-shielding film layer that blocks transmission of ultraviolet rays.
【００２８】また、遮光膜層１４の位置は、下型１ｂ側
から上型１ａ側を見た時に、遮光膜層１４によって上型
１ａの樹脂注入ゲート４、ランナー５、樹脂排出ゲート
７、ランナー８の少なくとも溝状部２ｄに接する周辺部
分が隠れるようにする。図４に示すように遮光膜層１４
によって上型１ａの樹脂注入ゲート４、ランナー５、ス
プル６、樹脂排出ゲート７、ランナー８、樹脂排出孔９
の全てが隠れるようにすることがより望ましい。また、
下型１ｂのパーテイング面２ｂの溝状部２を除く部分の
全面に遮光膜層１４を設けても良い。また、パーテイン
グ面２ｂに遮光膜層１４を形成してから溝状部２ｄを加
工して設けることにすれば、遮光膜層の材料が溝状部２
ｄ内の壁面に付着して、キャビテイ部分も一部遮光され
てしまうという不都合が起こることを避けることが出来
る。The position of the light shielding film layer 14 is such that the resin injection gate 4, the runner 5, the resin discharge gate 7 and the runner of the upper mold 1a are controlled by the light shielding film layer 14 when the upper mold 1a side is viewed from the lower mold 1b side. At least a peripheral portion of the groove 8 which is in contact with the groove 2d is hidden. As shown in FIG. 4, the light shielding film layer 14
The resin injection gate 4, runner 5, sprue 6, resin discharge gate 7, runner 8, resin discharge hole 9 of the upper mold 1a
It is more desirable to hide all of the. Also,
The light-shielding film layer 14 may be provided on the entire surface of the lower die 1b except the groove-like portion 2 of the parting surface 2b. Further, if the light shielding film layer 14 is formed on the parting surface 2b and then the groove portions 2d are processed and provided, the material of the light shielding film layer is the groove portion 2d.
It is possible to avoid the inconvenience of adhering to the wall surface inside d and partially shielding the cavity portion.
【００２９】また、キャビテイ内に注入した紫外線硬化
型樹脂への紫外線照射は下型１ｂを通して行なうので、
この遮光膜層１４があることによって、紫外線は一部遮
光される。そして、少なくとも上型１ａと下型１ｂとの
隙間に沁み込んだ紫外線硬化型樹脂及びランナーの溝状
部に接する箇所の樹脂には紫外線は当たらないので、そ
の部分の樹脂は未硬化のままで残る。従って、成形後に
光ファイバ接続部を取出した時、補強樹脂被覆の表面に
はその未硬化の部分が付着したまま取出されるが、樹脂
は未硬化で流動性のある状態であるので、布等で拭い去
るだけで容易にその樹脂の未硬化部分を除去することが
出来る。Further, since the ultraviolet curing resin injected into the cavity is irradiated with ultraviolet rays through the lower mold 1b,
Due to the presence of the light shielding film layer 14, a part of the ultraviolet rays are shielded. Further, since at least the ultraviolet curable resin that has penetrated into the gap between the upper mold 1a and the lower mold 1b and the resin that contacts the groove portion of the runner are not exposed to ultraviolet light, the resin in that part remains uncured. Remain. Therefore, when the optical fiber splicing part is taken out after molding, the uncured part remains on the surface of the reinforcing resin coating, but the resin is in an uncured and fluid state. The uncured portion of the resin can be easily removed simply by wiping with.
【００３０】また、溝状部内の紫外線硬化型樹脂は紫外
線の照射を受けて硬化するが、一方樹脂注入ゲート及び
樹脂排出ゲートにつながるランナー内の樹脂には紫外線
が照射されないので、流動し易い状態にある。このた
め、溝状部内の紫外線硬化型樹脂は硬化によって体積が
約１０％程度収縮しても、溝状部内は負圧になりランナ
ー内の樹脂が溝状部内側に流れ込む。これによって溝状
部内の樹脂は補充されるので、樹脂硬化時の体積収縮に
よって補強樹脂被覆とガラスファイバとの間に発生し易
かった隙間の発生を抑制することも出来る。Further, the ultraviolet curable resin in the groove is cured by being irradiated with ultraviolet rays, but the resin in the runners connected to the resin injection gate and the resin discharge gate is not irradiated with ultraviolet rays, so that the resin easily flows. It is in. For this reason, even if the volume of the ultraviolet curable resin in the grooved portion shrinks by about 10% due to curing, a negative pressure is generated in the grooved portion and the resin in the runner flows into the grooved portion. As a result, the resin in the groove portion is replenished, so that it is possible to suppress the generation of a gap that is likely to occur between the reinforcing resin coating and the glass fiber due to the volume contraction when the resin is cured.
【００３１】[0031]
【発明の効果】本発明の成形用型は、上型又は下型の少
なくとも一方は紫外線を透過する材料からなるものであ
って、上型と下型のパーテイング面に沿って直線状の横
断面円形のキャビテイを有し、該キャビテイに連通して
２箇所の樹脂注入ゲートとその間に樹脂排出ゲートが設
けられたものであるので、キャビテイ内の挿入した光フ
ァイバ接続箇所の被覆端近傍に配置した２つの樹脂注入
ゲートから紫外線硬化型樹脂を注入し、ガラスファイバ
の露出部の中央に位置する樹脂排出ゲートから空気及び
樹脂流の先端部分の樹脂を排出させることが出来るの
で、光ファイバの被覆端際に気泡が残留することはな
い。従って、気泡の無い補強樹脂被覆を光ファイバの接
続部に形成することが出来る。In the molding die of the present invention, at least one of the upper die and the lower die is made of a material that transmits ultraviolet rays, and has a linear cross section along the parting surfaces of the upper die and the lower die. Since it has a circular cavity, and two resin injection gates are provided in communication with the cavity and a resin discharge gate is provided between them, the cavity is arranged near the coated end of the inserted optical fiber connection in the cavity. The UV curable resin can be injected from two resin injection gates, and the resin at the tip of the air and the resin flow can be discharged from the resin discharge gate located at the center of the exposed portion of the glass fiber. At that time, air bubbles do not remain. Therefore, it is possible to form the reinforcing resin coating having no bubbles on the connecting portion of the optical fiber.
【００３２】また併せて、上型と下型のうち一方の型の
パーテイング面の２箇所の樹脂注入ゲートを含む区間の
前記溝状部に接する箇所を含めて該パーテイング面に沿
って遮光膜層を設け、かつ、樹脂注入ゲート及び樹脂排
出ゲート及びそれらのゲートに連通するランナーを他方
の型側に設けることにすれば、上型と下型に隙間に沁み
込んだ紫外線硬化型樹脂及び樹脂注入ゲート及び樹脂排
出ゲートにつながるランナー内の紫外線硬化型樹脂には
紫外線が照射されず、その部分の樹脂は未硬化の状態で
成形用型から取出すことが出来るので、その部分を簡単
に除去することが出来る。それによって、補強樹脂被覆
の表面に固くなった鰭状体が出来ることもない。In addition, the light-shielding film layer is formed along the parting surface of one of the upper die and the lower die along the parting surface including the portion in contact with the groove-like portion in the section including the resin injection gate. If the resin injection gate, the resin discharge gate, and the runners that communicate with these gates are provided on the other mold side, the UV curable resin and the resin injection that are in the gap between the upper mold and the lower mold. The UV curable resin in the runner connected to the gate and the resin discharge gate is not irradiated with UV light, and the resin in that part can be taken out from the molding die in an uncured state, so that part can be easily removed. Can be done. As a result, a hard fin-like body is not formed on the surface of the reinforcing resin coating.
【図１】本発明の成形用型の実施形態を示す図であっ
て、（Ａ）は上型のパーテイング面側から見た平面図、
（Ｂ）は上型の側面図、（Ｃ）は下型のパーテイング面
側から見た平面図、（Ｄ）は下型の側面図である。FIG. 1 is a view showing an embodiment of a molding die of the present invention, (A) is a plan view seen from a parting surface side of an upper die,
(B) is a side view of the upper mold, (C) is a plan view of the lower mold seen from the parting surface side, and (D) is a side view of the lower mold.
【図２】図１に示す成形用型を使って補強樹脂被覆の成
形を行なっているところを示す図であって、（Ａ）は正
面図、（Ｂ）は側面図である。2A and 2B are views showing a state where a reinforcing resin coating is being molded using the molding die shown in FIG. 1, in which FIG. 2A is a front view and FIG. 2B is a side view.
【図３】成形後の光ファイバ接続部を示す正面図であ
る。FIG. 3 is a front view showing an optical fiber connection portion after molding.
【図４】本発明にかかる成形用型の下型に遮光膜層を設
けた例を示す下型の平面図である。FIG. 4 is a plan view of a lower mold showing an example in which a light shielding film layer is provided on the lower mold of the molding die according to the present invention.
【図５】光ファイバの接続部を説明するための斜視図で
あって、（Ａ）は光ファイバ中のガラスファイバを融着
接続した状態を、（Ｂ）は接続部に補強樹脂被覆を施し
た状態を示す。5A and 5B are perspective views for explaining a connecting portion of an optical fiber, where FIG. 5A shows a state in which glass fibers in the optical fiber are fusion-spliced, and FIG. Shows the state.
【図６】従来技術による補強樹脂被覆の形成に使用する
成形用型と成形方法を説明する図であって、（Ａ）は上
型のパーテイング面側から見た平面図、（Ｂ）は上型の
側面図、（Ｃ）は下型のパーテイング面側からみた平面
図、（Ｄ）は下型の側面図、（Ｅ）は成形状態を示す正
面図、（Ｆ）はその側面図である。6A and 6B are views for explaining a molding die and a molding method used for forming a reinforcing resin coating according to a conventional technique, in which FIG. 6A is a plan view seen from the side of the upper die on the parting surface, and FIG. A side view of the mold, (C) is a plan view of the lower mold seen from the side of the parting surface, (D) is a side view of the lower mold, (E) is a front view showing a molding state, and (F) is a side view thereof. .
１：成形用型 １ａ：上型 １ｂ：下型 ２ａ、２ｂ：パーテイング面 ２ｃ、２ｄ：溝状部 ３：キャビテイ ４：樹脂注入ゲート ５：ランナー ６：スプル ７：樹脂排出ゲート ８：ランナー ９：樹脂排出孔 １０：光ファイバ １１：ガラスファイバ １２：紫外線 １３：補強樹脂被覆 １４：遮光膜層 1: Mold for molding 1a: Upper mold 1b: Lower mold 2a, 2b: Parting surface 2c, 2d: groove portion 3: Cavity 4: Resin injection gate 5: Runner 6: Sprue 7: Resin discharge gate 8: Runner 9: Resin discharge hole 10: Optical fiber 11: Glass fiber 12: UV 13: Reinforced resin coating 14: Light-shielding film layer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 守屋 知巳 神奈川県横浜市栄区田谷町１番地 住友 電気工業株式会社横浜製作所内 (72)発明者 井尾 賢司 神奈川県横浜市栄区田谷町１番地 住友 電気工業株式会社横浜製作所内 (56)参考文献 特開 平６−148452（ＪＰ，Ａ) 特開 昭56−123508（ＪＰ，Ａ) 特開 昭57−151909（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 6/255 G02B 6/44 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Moriya Tomomi 1 Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa Sumitomo Electric Industries, Ltd. Yokohama Works (72) Kenji Io 1 Taya-cho, Sakae-ku, Yokohama, Kanagawa Sumitomo Electric Industries Yokohama Works Co., Ltd. (56) Reference JP-A-6-148452 (JP, A) JP-A-56-123508 (JP, A) JP-A-57-151909 (JP, A) (58) Fields investigated ( Int.Cl. 7 , DB name) G02B 6/255 G02B 6/44
Claims (3)
からなる上型と下型とで構成された成形用型であって、 前記上型と前記下型のそれぞれのパーティング面に沿っ
て直線状に貫通して形成された横断面半円形の溝状部に
よって形作られるキャビティを有し、 樹脂注入ゲートが、線状体上の被覆が除去された部分に
相当する所定の間隔を有し、前記キャビティの長手方向
の２個所に設けられており、 樹脂排出ゲートが前記２個所の樹脂注入ゲートの中央の
前記キャビティに設けられていることを特徴とする線状
体の再被覆用の紫外線硬化型樹脂被覆成形用型。1. A molding die, at least one of which is composed of an upper die and a lower die made of a material that transmits ultraviolet rays, and has a linear shape along each parting surface of the upper die and the lower die. It has a cavity formed by a groove with a semicircular cross section formed through it, and a resin injection gate is provided on the linear body at the uncovered portion.
A line characterized by being provided at two locations in the longitudinal direction of the cavity with a corresponding predetermined spacing, and a resin discharge gate being provided in the cavity at the center of the two resin injection gates. Condition
Ultraviolet curable resin coating mold for recoating the body .
る少なくとも一方の型のパーティング面には、前記２個
所の樹脂注入ゲートを含む区間の前記溝状部を取り囲む
パーティング面部分であって、前記溝状部を除く部分に
遮光膜層が設けられ、かつ、 前記樹脂注入ゲート、前記樹脂排出ゲート及びそれらの
ゲートに連通するランナーは他方の型のみに設けられて
いることを特徴とする請求項１記載の線状体の再被覆用
の紫外線硬化型樹脂被覆成形用型。2. The parting surface of at least one of the upper mold and the lower mold, which is made of a UV-transmissive material, has a parting surface part surrounding the groove-shaped part in a section including the two resin injection gates. A light-shielding film layer is provided in a portion other than the groove portion, and the resin injection gate, the resin discharge gate, and a runner communicating with these gates are provided only in the other mold. For recoating the linear body according to claim 1 .
Ultraviolet curable resin coated mold of.
からなる上型と下型とで構成された成形用型であって、 前記上型と前記下型のそれぞれのパーティング面に沿っ
て直線状に貫通して形成された横断面半円形の溝状部に
よって形作られるキャビティを有し、 樹脂注入ゲートが前記キャビティの長手方向の２個所に
設けられており、 樹脂排出ゲートが前記２個所の樹脂注入ゲートの中央の
前記キャビティに設けられている成形用型を使い、 ２本の光ファイバの端部においてそれぞれ被覆を除去し
てガラスファイバを露出させて該２本のガラスファイバ
の端面同士を突合わせて融着接続を行ったガラスファイ
バ露出部を含む光ファイバ部分を前記成形用型のキャビ
ティ内に挿入して、 ガラスファイバ露出部両側の被覆端近傍に位置させた２
つの前記樹脂注入ゲートから、前記キャビティ内のガラ
スファイバ周囲の空洞部に紫外線硬化型樹脂を注入し、 しかる後成形用型の外方から前記紫外線透過材料からな
る側の型を通して紫外線を照射し、 前記キャビティ内に注入された紫外線硬化型樹脂を硬化
させて補強樹脂被覆を形成することを特徴とする光ファ
イバ接続部の補強方法。3. A molding die, at least one of which is composed of an upper die and a lower die made of a material that transmits ultraviolet rays, and has a linear shape along each parting surface of the upper die and the lower die. Has a cavity formed by a groove portion having a semicircular cross section formed penetrating the resin, resin injection gates are provided at two locations in the longitudinal direction of the cavity, and resin discharge gates are provided at the two locations. Using a molding die provided in the cavity at the center of the injection gate, the coating is removed at the ends of the two optical fibers to expose the glass fibers and the end faces of the two glass fibers are projected. The optical fiber portion including the exposed glass fiber portion, which was also fusion-spliced, was inserted into the cavity of the molding die and positioned near the coated ends on both sides of the exposed glass fiber portion.
From one of the resin injection gates, an ultraviolet curable resin is injected into the cavity around the glass fiber in the cavity, and then ultraviolet rays are radiated from the outside of the molding die through the mold on the side made of the ultraviolet transmissive material, A method for reinforcing an optical fiber connecting portion, characterized by curing the ultraviolet curable resin injected into the cavity to form a reinforcing resin coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000086786A JP3531574B2 (en) | 2000-03-27 | 2000-03-27 | Mold for molding and method of reinforcing optical fiber connection using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000086786A JP3531574B2 (en) | 2000-03-27 | 2000-03-27 | Mold for molding and method of reinforcing optical fiber connection using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001272571A JP2001272571A (en) | 2001-10-05 |
| JP3531574B2 true JP3531574B2 (en) | 2004-05-31 |
Family
ID=18602897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000086786A Expired - Fee Related JP3531574B2 (en) | 2000-03-27 | 2000-03-27 | Mold for molding and method of reinforcing optical fiber connection using the same |
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| Country | Link |
|---|---|
| JP (1) | JP3531574B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4677910B2 (en) * | 2006-01-20 | 2011-04-27 | 住友電気工業株式会社 | Method and apparatus for re-coating optical fiber connection |
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- 2000-03-27 JP JP2000086786A patent/JP3531574B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001272571A (en) | 2001-10-05 |
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