JP2849737B2 - Optical fiber coil and its winding method - Google Patents
Optical fiber coil and its winding methodInfo
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- JP2849737B2 JP2849737B2 JP20969295A JP20969295A JP2849737B2 JP 2849737 B2 JP2849737 B2 JP 2849737B2 JP 20969295 A JP20969295 A JP 20969295A JP 20969295 A JP20969295 A JP 20969295A JP 2849737 B2 JP2849737 B2 JP 2849737B2
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- optical fiber
- bobbin
- layer
- optical fibers
- wound
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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ジャイロ
などのリング干渉計を応用した光ファイバセンサに用い
る光ファイバコイルに関する。The present invention relates to an optical fiber coil used for an optical fiber sensor to which a ring interferometer such as an optical fiber gyro is applied.
【０００２】[0002]
【従来の技術】光ファイバジャイロなどのリング干渉計
において、光ファイバコイルで構成されたセンシング部
分に不均一な温度変化が印加されると、センシング部の
光ファイバを伝播する左回り光と右回り光の位相差が変
動し、零点出力のドリフトとなることが知られている。
この現象は D. M. Shupeにより Applied Optics, Vol 1
9,P.654 〜 655(1980)に報告されており、そのドリフト
量は次式で示されている。2. Description of the Related Art In a ring interferometer such as an optical fiber gyro, when a non-uniform temperature change is applied to a sensing portion constituted by an optical fiber coil, counterclockwise light and clockwise light propagating through an optical fiber of the sensing portion. It is known that the phase difference of light fluctuates, resulting in drift of zero point output.
This phenomenon was reported by DM Shupe in Applied Optics, Vol 1
9, pages 654 to 655 (1980), and the drift amount is shown by the following equation.
【０００３】[0003]
【数１】 φE ；ドリフト量（位相差）、ｎ；ファイバ屈折率、
α；ファイバ線膨張係数、ｃ；光速、λ：伝播光波長、
Ｌ；光ファイバ長、ｘ；光ファイバの一端からの距離、
Ｔ；温度 このドリフトを最小化する公知の方法として、ファイバ
全長Ｌの中点に対し、対称な位置にある光ファイバ部分
を空間的に近い位置に配置することで左回り光と右回り
光が等しい温度影響を受けることにより、前記の出力ド
リフトを低減する方法が知られている。(Equation 1) φ E : drift amount (phase difference), n: fiber refractive index,
α: fiber linear expansion coefficient, c: speed of light, λ: propagating light wavelength,
L: optical fiber length, x: distance from one end of the optical fiber,
T: Temperature As a well-known method for minimizing this drift, left-handed light and right-handed light are arranged by arranging an optical fiber portion symmetrically located at a position spatially close to the midpoint of the entire length L of the fiber. It is known to reduce the aforementioned output drift by being affected by equal temperatures.
【０００４】この光ファイバコイル１に巻回される光フ
ァイバ２は図２に示すように中点Ｐに対する左右のＡ及
びＢの部分は長さがＬ／２で相等しい。いまＡ及びＢの
部分を層別にＡ1 ，Ａ2 …，Ａn 層及びＢ1 ，Ｂ2 …，
Ｂn 層に分けて考えると、Ａ 1 層とＢ1 層、Ａ2 層とＢ
2 層，…，Ａn 層とＢn 層はそれぞれ空間的に近い位置
に巻回される。The optical fiber wound around the optical fiber coil 1
Fiber 2 has a right and left A with respect to the midpoint P as shown in FIG.
And B are equal in length to L / 2. Of A and B
A by layer1, ATwo…, AnLayer and B1, BTwo…,
BnConsidering the layers, A 1Layer and B1Layer, ATwoLayer and B
TwoLayer, ..., AnLayer and BnLayers are spatially close to each other
Wound around.
【０００５】この発明を得る前の段階で考えられた光フ
ァイバコイルの巻線方法を工程順に説明する。 同じ形状のボビン３ａ，３ｂを用意し、その一方に
光ファイバ供給源より全長Ｌ（Ｎターン；Ｎの値は予め
実験的に求めてある）だけ巻き取る（図３Ａ）。A method of winding an optical fiber coil, which was considered before the present invention was obtained, will be described in the order of steps. The bobbins 3a and 3b having the same shape are prepared, and one of the bobbins 3a and 3b is wound around the entire length L (N turns; the value of N is experimentally obtained in advance) from the optical fiber supply source (FIG. 3A).
【０００６】 他方のボビンにＬ／２の長さ（Ｍター
ン；Ｍの値は予め実験的に求めてある）だけ巻き取る。
これによりボビン３ａ，３ｂに、全長Ｌの光ファイバ２
がＬ／２（Ｍターン）ずつ巻回される。光ファイバはそ
の両端末２ａ，２ｂ側からボビン３ａ，３ｂにそれぞれ
巻回され、長さＬ／２ずつ巻き取られる。２つのボビン
の最外層の巻き終り同士は光ファイバ２ｍで連結されて
おり、光ファイバ２ｍの中間が光ファイバ２の中点Ｐと
なる（図３Ｂ）。The other bobbin is wound by a length of L / 2 (M turns; the value of M is experimentally obtained in advance).
As a result, the optical fiber 2 having a total length L is attached to the bobbins 3a and 3b.
Are wound L / 2 (M turns) at a time. The optical fiber is wound around bobbins 3a and 3b from both ends 2a and 2b, respectively, and is wound by a length L / 2. The ends of the outermost layers of the two bobbins are connected by an optical fiber 2m, and the middle of the optical fiber 2m is the middle point P of the optical fiber 2 (FIG. 3B).
【０００７】 ボビン３ａの光ファイバをその中点Ｐ
側より光ファイバコイル用ボビン４に１層（Ａ1 層）だ
け巻く。 ボビン３ｂの光ファイバをその中点Ｐ側よりＡ1 層
上に１層（Ｂ1 層）だけ巻く。 図４に示すように上記と同様にボビン４にボビン３
ａまたは３ｂの光ファイバを１層ずつ巻き取る（順序は
どちらが先でもよい）。[0007] The optical fiber of the bobbin 3a is connected to its midpoint P
One layer to the optical fiber coil bobbin 4 from the side only (A 1 layer) winding. Wound only one layer A 1 layer on from its middle point P side optical fiber bobbin 3b (B 1 layer). As shown in FIG.
The optical fiber a or 3b is wound one layer at a time (the order may be either first).
【０００８】 Ａｉ層とＢｉ層の巻数には偏差が存在
するため一方のボビンの光ファイバの巻取りが、ある層
の途中で先に完了すると、その同じ層及び必要に応じそ
の上の層に他方のボビンの光ファイバを全て巻き取る。
図４の最外層（ＡＢ）５は両方のホビンの光ファイバを
端末まで巻き取った層である。図４ＡはＡ1 Ｂ1 Ｂ2 Ａ
2 ；Ａ3 Ｂ3 Ｂ4 Ａ4 と４層１組としてＡＢＢＡの順を
繰り返した場合、図４ＢはＡ1 Ｂ1 ，Ａ2 Ｂ2 ，Ａ3 Ｂ
3 ，Ａ4 Ｂ4 と２層１組としてＡＢの順を繰り返した場
合、図４Ｃは４層１組とするがＡ1 Ｂ1 Ｂ2 Ａ 2 の次に
はＡとＢを入れ替えてＢ3 Ａ3 Ａ4 Ｂ4 を巻くようにし
た場合である。通常１層は数１００ターンより成り、全
層数は数１０層にも及ぶ。There is a deviation in the number of turns between the Ai layer and the Bi layer
The winding of the optical fiber of one bobbin
If completed earlier in the process, the same layer and, if necessary,
Wind all the optical fibers of the other bobbin on the layer above.
The outermost layer (AB) 5 in FIG.
It is a layer wound up to the terminal. FIG. 4A shows A1B1BTwoA
TwoAThreeBThreeBFourAFourAnd the order of ABBA as a set of 4 layers
When repeated, FIG.1B1, ATwoBTwo, AThreeB
Three, AFourBFourAnd when the order of AB is repeated as a pair
In the case of FIG.1B1BTwoA TwoAfter
Replaces A and BThreeAThreeAFourBFourTo wind
Is the case. Usually one layer consists of several hundred turns,
The number of layers extends to several tens.
【０００９】図４Ａ，Ｂ，Ｃのいずれの場合もＡｉ層と
Ｂｉ層は隣接して配され、光ファイバコイル１の巻線部
の構造は中点Ｐに対してほゞ対称となる。In each of FIGS. 4A, 4B and 4C, the Ai layer and the Bi layer are arranged adjacent to each other, and the structure of the winding portion of the optical fiber coil 1 is almost symmetric with respect to the middle point P.
【００１０】[0010]
【発明が解決しようとする課題】しかしながら、従来技
術で述べた中点に対し左右対称な位置に巻線を配置する
方法は、現実には巻き乱れが生じてＡｉ層とＢｉ層の巻
数が同じにならず、そのずれ分だけ温度変動により左回
り光と右回り光の位相差の変動が大きくなる。コイル層
数が増えれば増えるほど、その巻き乱れが顕著である。
つまり、コイル終端に近づくほど、ＡｉとＢｉの巻数の
ずれが大きく、光ファイバコイル構造の対称性が失われ
る。However, the method of arranging the windings symmetrically with respect to the center point described in the prior art, however, actually causes a winding disturbance and the number of turns of the Ai layer and the Bi layer is the same. However, the phase difference between the left-handed light and the right-handed light greatly fluctuates due to the temperature fluctuation due to the deviation. As the number of coil layers increases, the turbulence is more remarkable.
In other words, the closer the coil ends are, the greater the difference in the number of turns between Ai and Bi is, and the symmetry of the optical fiber coil structure is lost.
【００１１】光ファイバコイル１のＡｉ層とＢｉ層の巻
数のずれにより生ずる左回り光と右回り光の温度変動に
よる位相差の変動はＡｉ層とＢｉ層がコイルの両端末に
近づくほど大きくなる特性をもっている。そのため従来
の光ファイバコイルは温度変動による左回り光と右回り
光の間の位相差の変動が大きくなる欠点があった。この
発明は、この位相差の変動を軽減することを目的として
いる。The phase difference fluctuation due to the temperature fluctuation of the left-handed light and right-handed light caused by the difference in the number of turns between the Ai layer and the Bi layer of the optical fiber coil 1 increases as the Ai layer and the Bi layer come closer to both ends of the coil. Has characteristics. For this reason, the conventional optical fiber coil has a disadvantage that the phase difference between the left-handed light and the right-handed light due to the temperature fluctuation greatly varies. An object of the present invention is to reduce the fluctuation of the phase difference.
【００１２】[0012]
（１）請求項１の巻線方法は、光ファイバコイルに巻く
べき光ファイバ（長さＬ）を第１ボビンに巻線し、第１
ボビンに巻かれた光ファイバの内の半分（Ｌ／２）を第
２ボビンに巻き取り、第１ボビンの最外層から第２ボビ
ンの最外層に移行する光ファイバの中間を中点とし、そ
の中点で光ファイバを折り返して２本１組とし、糸巻状
の光ファイバコイル用ボビンの一方のフランジの孔（第
１層の位置の近傍に設けられる）より外部に導出する。
光ファイバコイル用ボビンに第１，第２ボビンの光ファ
イバを複数対巻線する（第１，第２ボビンの光ファイバ
を１層ずつ重ねて巻いたものを１対とする、各対の第
１，第２ボビンからの光ファイバはどちらを先に巻いて
もよい）。(1) In the winding method of the first aspect, an optical fiber (length L) to be wound around an optical fiber coil is wound around a first bobbin.
Half (L / 2) of the optical fiber wound on the bobbin is wound on the second bobbin, and the middle point of the optical fiber that transitions from the outermost layer of the first bobbin to the outermost layer of the second bobbin is set as a middle point. The optical fiber is folded at the midpoint to form a set of two, and is led out through a hole (provided near the position of the first layer) of one flange of the bobbin for the wound fiber optic coil.
A plurality of pairs of the first and second bobbin optical fibers are wound around the optical fiber coil bobbin (the first and second bobbin optical fibers are layered one by one and wound as one pair. Either of the optical fibers from the first and second bobbins may be wound first).
【００１３】ある層の巻線の途中で第１，第２ボビンの
いずれか一方の光ファイバの巻取りが先に終了すると、
その同じ層及び必要に応じその上の層に他方のボビンの
光ファイバを全て巻き取る。光ファイバコイル用ボビン
に第１，第２ボビンからそれぞれ巻き取った光ファイバ
（Ｌ／２）の端末同士を融着接続し、光ファイバコイル
用ボビンのフランジの孔より外部に導出した光ファイバ
の折り返し点（中点）を切断して、光ファイバコイルの
両端末を形成する。When the winding of one of the first and second bobbins is completed in the middle of the winding of a certain layer,
Wind all the optical fibers of the other bobbin around the same layer and, if necessary, the layer above. The ends of the optical fibers (L / 2) wound respectively from the first and second bobbins are fusion-spliced to the bobbin for the optical fiber coil, and the optical fiber drawn out to the outside from the hole of the flange of the bobbin for the optical fiber coil. The turning point (middle point) is cut to form both ends of the optical fiber coil.
【００１４】（２）請求項２の巻線方法は、同一仕様の
光ファイバを蓄えた第１，第２供給源の光ファイバ（第
１，第２光ファイバと言う）を、それぞれの始端部分を
光ファイバコイル用ボビンのフランジに形成された孔
（第１層の位置の近傍に設けられる）より外部に導出し
て、コイルの両端末を形成し、それら第１，第２光ファ
イバを光ファイバコイル用ボビンに所定の対数（ｎ）巻
線し（第１，第２光ファイバを１層ずつ重ねて巻いたも
のを１対とする、各対の第１，第２光ファイバはどちら
を先に巻いてもよい）、それら第１，第２光ファイバの
巻き終りの端面を融着接続する。(2) In the winding method according to the second aspect, the optical fibers of the first and second supply sources (referred to as first and second optical fibers) storing optical fibers of the same specification are respectively connected to the starting portions. To the outside through a hole (provided near the position of the first layer) formed in the flange of the bobbin for an optical fiber coil to form both ends of the coil. A predetermined number (n) of windings is wound around a bobbin for a fiber coil (a pair of first and second optical fibers layered and wound one by one). The first and second optical fibers may be fusion-spliced at their end surfaces.
【００１５】（３）請求項３の光ファイバコイルは、光
ファイバコイルの両端末（第１，第２端末と言う）が糸
巻状ボビンのフランジの孔（第１層の位置の近傍に設け
られる）より外部に導出される。第１，第２端末をそれ
ぞれ始端（巻き始め端）とする光ファイバ（第１，第２
光ファイバと言う）が、ボビンに少なくとも所定の対数
（ｎ）巻線される（第１，第２光ファイバを１層ずつ重
ねて巻いたものを１対とする、しかし各対の第１，第２
光ファイバはいずれが先に巻かれてもよい）。第１，第
２光ファイバの巻き終り端が融着接続されている。(3) In the optical fiber coil according to the third aspect, both ends (referred to as first and second ends) of the optical fiber coil are provided near the hole of the flange of the bobbin (the position of the first layer). ). An optical fiber (first and second terminals) having the first and second terminals as starting ends (winding start ends), respectively.
An optical fiber is wound on the bobbin at least by a predetermined number (n) of windings (first and second optical fibers are layered one by one and wound as a pair, but the first and second optical fibers are each paired). Second
Any of the optical fibers may be wound first). The ends of the first and second optical fibers are fusion-spliced.
【００１６】[0016]
【発明の実施の形態】光ファイバコイルの中点Ｐの左右
のファイバＡ，Ｂに巻数、その他の構造的なアンバラン
スがあると温度ドリフトによって左回り光と右回り光と
の間の位相差が変動し、その内でも光ファイバＡ，Ｂの
両端末により近い部分のアンバランスほどその影響が大
きい。DESCRIPTION OF THE PREFERRED EMBODIMENTS If there are a number of turns and other structural imbalances in the fibers A and B on the left and right of the midpoint P of the optical fiber coil, the phase difference between left-handed light and right-handed light due to temperature drift. Fluctuates, and among them, the influence of the unbalance of the portion closer to both ends of the optical fibers A and B is more significant.
【００１７】この発明を得る前の段階で考えられた光フ
ァイバコイルは、外層に近くなるほど巻き乱れが多くな
り、対をなすＡｉ層とＢｉ層の巻数に差が生じ易い。
（ＡＢ）５層のように最外層にＡ，Ｂを混在する場合も
巻数のアンバランスが生じ易い。一方、Ａｉ層，Ｂｉ層
のように内層に近い層ほど巻き乱れが少なく、巻数のア
ンバランスも少ない。In the optical fiber coil conceived before the present invention is obtained, the turbulence increases as it approaches the outer layer, and the difference in the number of turns between the paired Ai layer and Bi layer tends to occur.
(AB) Even when A and B are mixed in the outermost layer such as five layers, the number of turns is easily unbalanced. On the other hand, layers closer to the inner layer, such as the Ai layer and the Bi layer, have less turbulence and have less imbalance in the number of turns.
【００１８】従って、もしＡ1 層，Ｂ1 層側がコイルの
両端末側に、最外層側が中点側になるように巻線するこ
とができれば、両端末に近い対（Ａｉ，Ｂｉ）ほど層間
の巻数のアンバランスが少なくなり、温度ドリフトによ
る位相差の変動を改善することができるはずである。そ
こでこの発明では、図１Ａに示すように、図２の巻線の
中点Ｐとその近傍の部分をはじめにボビン４のフランジ
の孔より外部に導出させておいてから、各対（Ａｉ，Ｂ
ｉ）の層を順次巻線し、最外層の端末２ａ，２ｂを融着
接続して新しい中点とし、折り返し点（中点）Ｐを切断
して新しい両端末を形成する。以下に巻線作業の詳細を
工程順に説明する。Therefore, if the coil can be wound so that the A 1 layer and the B 1 layer are on both ends of the coil and the outermost layer is on the midpoint side, the closer the pair (Ai, Bi) is to the both ends, the more the interlayer is. Should be able to reduce the unbalance of the number of turns of the phase difference and improve the fluctuation of the phase difference due to the temperature drift. Therefore, in the present invention, as shown in FIG. 1A, the midpoint P of the winding in FIG. 2 and a portion in the vicinity thereof are first led out of the hole of the flange of the bobbin 4, and then each pair (Ai, B
The layers of i) are sequentially wound, the outermost terminals 2a and 2b are fusion-spliced to form a new midpoint, and the turning point (midpoint) P is cut to form both new ends. The details of the winding operation will be described below in the order of steps.
【００１９】 第１ボビン３ａに、光ファイバコイル
に巻くべき光ファイバ（長さＬ）２を巻線する（図３
Ａ）。 第２ボビン３ｂに、第１ボビン３ａに巻かれた光フ
ァイバ２の内の半分（Ｌ／２）を巻き取る（図３Ｂ）。 第１ボビン３ａの最外層から第２ボビン３ｂの最外
層に移行する光ファイバ２ｍの中間を中点Ｐとし、その
中点で光ファイバ２を折り返して２本１組とし、光ファ
イバ用ボビン４の一方のフランジ４ａの孔（第１層の位
置の近傍に設けられる）より外部に導出する。An optical fiber (length L) 2 to be wound around an optical fiber coil is wound around the first bobbin 3a (FIG. 3)
A). Half (L / 2) of the optical fiber 2 wound around the first bobbin 3a is wound around the second bobbin 3b (FIG. 3B). The middle point of the optical fiber 2m that shifts from the outermost layer of the first bobbin 3a to the outermost layer of the second bobbin 3b is defined as a middle point P, and the optical fiber 2 is folded at the middle point to form a pair of two optical fibers. Out of one of the flanges 4a (provided near the position of the first layer).
【００２０】 光ファイバコイル用ボビン４に第１，
第２ボビンの光ファイバを複数対巻線する。ここで、第
１，第２ボビンの光ファイバを１層ずつ重ねて巻いたも
のを１対とする。各対の第１，第２ボビンからの光ファ
イバはどちらを先に巻いてもよい。従って、図４Ａ，
Ｂ，Ｃで示したような各層の配列が可能である。 ある層の巻線の途中で第１，第２ボビンのいずれか
一方の光ファイバの巻取りが先に終了すると、その同じ
層及び必要に応じその上の層に他方のボビンの光ファイ
バを全て巻き取る。The first and second optical fiber coil bobbins 4 are
A plurality of pairs of optical fibers of the second bobbin are wound. Here, a pair of optical fibers of the first and second bobbins wound one upon another in layers is referred to as a pair. Either of the optical fibers from the first and second bobbins of each pair may be wound first. Therefore, FIG.
The arrangement of each layer as shown by B and C is possible. When the winding of one of the first and second bobbins is completed in the middle of the winding of a certain layer, all the optical fibers of the other bobbin are wound on the same layer and, if necessary, on the layer above it. Take up.
【００２１】 第１，第２ボビンから巻き取った光フ
ァイバの端末同士を融着接続して、中点を形成する。 において外部に導出した１組の光ファイバの折り
返し点（中点）Ｐを切断して、光ファイバコイルの両端
末を形成する。とはいずれが先でもよい。以上の巻
線方法を用いた光ファイバコイルは、光ファイバの全長
が所定値Ｌに保持され、新しい中点Ｑの左右の光ファイ
バの長さはそれぞれＬ／２に保持される特徴がある。The ends of the optical fibers wound from the first and second bobbins are fusion-spliced to form a midpoint. In (2), the turning point (middle point) P of a set of optical fibers led out is cut to form both ends of the optical fiber coil. May be the first. The optical fiber coil using the above winding method is characterized in that the entire length of the optical fiber is maintained at a predetermined value L, and the lengths of the optical fibers on the left and right of the new midpoint Q are each maintained at L / 2.
【００２２】光ファイバコイルには全長Ｌに多少の誤差
を許容できる場合もある。このような場合に、図１Ａで
巻線Ａ，Ｂの混在する最外層（ＡＢ）５を省略する。従
って所定の対数（ｎ）になるようにＡ，Ｂを巻線すれば
よいので、２つの光ファイバ供給源を用いることにより
前述の，の工程は不要となる。次に、この場合の巻
線方法を図１Ｂを参照して説明する。In some cases, the optical fiber coil can tolerate some errors in the overall length L. In such a case, the outermost layer (AB) 5 in which the windings A and B are mixed in FIG. 1A is omitted. Therefore, since A and B need only be wound so as to have a predetermined logarithm (n), the use of two optical fiber supply sources eliminates the above-mentioned step. Next, a winding method in this case will be described with reference to FIG. 1B.
【００２３】 同一仕様の光ファイバを蓄えた第１，
第２供給源の光ファイバ（第１，第２光ファイバと言
う）を、それぞれの始端部分を光ファイバコイル用ボビ
ン４のフランジに形成された孔より外部に導出して、コ
イルの両端末Ｔａ，Ｔｂを形成する。 それら第１，第２光ファイバを光ファイバコイル用
ボビン４に所定の対数（ｎ）巻線する。ここで、第１，
第２光ファイバを１層ずつ重ねて巻いたものを１対とす
る。各対の第１，第２光ファイバはどちらを先に巻いて
もよい。The first and the second optical fibers storing the same specifications
The leading ends of the optical fibers of the second supply source (referred to as first and second optical fibers) are led out through holes formed in the flange of the optical fiber coil bobbin 4, and both ends Ta of the coil are taken out. , Tb. The first and second optical fibers are wound around the optical fiber coil bobbin 4 by a predetermined number of logs (n). Here, the first
A pair of second optical fibers wound one upon another in layers is referred to as a pair. Either of the first and second optical fibers in each pair may be wound first.
【００２４】 それら第１，第２光ファイバの巻き終
りの端面を融着接続する。The end faces of the first and second optical fibers at the end of winding are fusion-spliced.
【００２５】[0025]
【発明の効果】この発明では光ファイバの温度ドリフト
により発生する左回り光と右回り光の間の位相差の変動
に最も影響を与えるコイルの両端末に近い側の層Ａｉ，
Ｂｉは、巻き乱れの少ないボビンの内層側に巻線される
ので、巻数の差を極めて少なくすることができる。一
方、上記位相差に与える影響の少ない中点に近い側の層
Ａｊ，Ｂｊは、巻き乱れの生じ易い、従って層間の巻数
に差がでやすいボビンの外層側に巻かれる。このように
この発明では、巻線Ａ，Ｂの各層のボビン上の配置をこ
れまでに考えられていた配置と逆の配置をとることによ
って、層Ａｉ，Ｂｉ間の巻数のアンバランスにより生じ
る温度ドリフトによる位相差変動を大幅に減少すること
ができる。According to the present invention, the layers Ai, on the side close to both ends of the coil, which most influence the fluctuation of the phase difference between the left-handed light and the right-handed light caused by the temperature drift of the optical fiber.
Since Bi is wound on the inner layer side of the bobbin with less winding disturbance, the difference in the number of turns can be extremely reduced. On the other hand, the layers Aj and Bj on the side close to the middle point which have little effect on the phase difference are wound on the outer layer side of the bobbin in which the turbulence is apt to occur and the number of turns between the layers is apt to be different. As described above, in the present invention, by disposing the layers of the windings A and B on the bobbin in an opposite arrangement to the arrangement considered up to now, the temperature caused by the imbalance in the number of turns between the layers Ai and Bi is obtained. Phase difference fluctuation due to drift can be significantly reduced.
【図１】この発明の実施例を示す原理的な断面図。FIG. 1 is a principle sectional view showing an embodiment of the present invention.
【図２】光ファイバ用ボビンに巻線すべき光ファイバを
直線状に展開して層別に符号を付けた図。FIG. 2 is a diagram in which optical fibers to be wound on an optical fiber bobbin are linearly developed, and symbols are assigned to respective layers.
【図３】光ファイバ用ボビンに巻線を開始するまでの段
取りを説明するための原理的な斜視図。FIG. 3 is a principle perspective view for explaining a setup up to starting winding on an optical fiber bobbin.
【図４】この発明を得る前の段階で考えられた光ファイ
バコイルの巻線方法を説明するための原理的な断面図。FIG. 4 is a cross-sectional view of a principle for explaining a method of winding an optical fiber coil conceived in a stage before obtaining the present invention.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) G01C 19/00 - 19/72 G02B 6/00──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. 6 , DB name) G01C 19/00-19/72 G02B 6/00
Claims (3)
（長さＬ）を第１ボビンに巻線し、 その第１ボビンに巻かれた光ファイバの内の半分（Ｌ／
２）を第２ボビンに巻き取り、 第１ボビンの最外層から第２ボビンの最外層に移行する
光ファイバの中間を中点とし、その中点で光ファイバを
折り返して２本１組とし、糸巻状の光ファイバコイル用
ボビンの一方のフランジの孔（第１層の位置の近傍に設
けられる）より外部に導出し、 その光ファイバコイル用ボビンに第１，第２ボビンの光
ファイバを複数対巻線し（第１，第２ボビンの光ファイ
バを１層ずつ重ねて巻いたものを１対とする、各対の第
１，第２ボビンからの光ファイバはどちらを先に巻いて
もよい）、 ある層の巻線の途中で第１，第２ボビンのいずれか一方
の光ファイバの巻取りが先に終了すると、その同じ層及
び必要に応じその上の層に他方のボビンの光ファイバを
全て巻取り、 前記光ファイバコイル用ボビンに第１，第２ボビンから
それぞれ巻き取った光ファイバ（Ｌ／２）の端末同士を
融着接続し、 前記光ファイバコイル用ボビンのフランジの孔より外部
に導出した光ファイバの折り返し点（中点）を切断し
て、光ファイバコイルの両端末を形成することを特徴と
する光ファイバコイルの巻線方法。An optical fiber (length L) to be wound around an optical fiber coil is wound around a first bobbin, and half (L / L) of the optical fiber wound around the first bobbin is wound.
2) is wound around a second bobbin, the middle point of the optical fiber that shifts from the outermost layer of the first bobbin to the outermost layer of the second bobbin is set as a middle point, and the optical fibers are folded at the middle point to form a pair of two. A plurality of optical fibers of the first and second bobbins are led out of a hole (provided near the position of the first layer) of one flange of the bobbin for a thread-shaped optical fiber coil, and the optical fiber coil bobbin is provided with a plurality of optical fibers. A pair is formed by winding the optical fibers of the first and second bobbins one by one and winding them as a pair. The optical fibers from the first and second bobbins in each pair may be wound in any order. If the winding of one of the first and second bobbins is completed first in the middle of the winding of a certain layer, the light of the other bobbin is applied to the same layer and, if necessary, to the layer above it. Winding all the fiber, the first and second bobbins for the optical fiber coil The ends of the optical fibers (L / 2) respectively wound from the second bobbin are fusion-spliced to each other, and the turning point (middle point) of the optical fiber led out from the hole of the flange of the bobbin for the optical fiber coil is cut. And forming both ends of the optical fiber coil.
２供給源の光ファイバ（第１，第２光ファイバと言う）
を、それぞれの始端部分を光ファイバコイル用ボビンの
フランジに形成された孔（第１層の位置の近傍に設けら
れる）より外部に導出して、コイルの両端末を形成し、 その光ファイバコイル用ボビンに前記第１，第２光ファ
イバを所定の対数（ｎ）巻線し（第１，第２光ファイバ
を１層ずつ重ねて巻いたものを１対とする、各対の第
１，第２光ファイバはどちらを先に巻いてもよい）、 それら第１，第２光ファイバの巻き終りの端面を融着接
続することを特徴とする光ファイバコイルの巻線方法。2. An optical fiber of a first and second supply source storing optical fibers of the same specification (referred to as first and second optical fibers).
Are respectively led out through holes (provided near the position of the first layer) formed in the flange of the optical fiber coil bobbin to form both ends of the coil. The first and second optical fibers are wound on the bobbin for a predetermined number (n) of windings (the first and second optical fibers are layered one by one and wound to form a pair, and the first and second optical fibers of each pair are formed as a pair). Either of the second optical fiber may be wound first), and the end surfaces of the first and second optical fibers at the end of winding are fusion-spliced.
端末と言う）が糸巻状ボビンのフランジの孔（第１層の
位置の近傍に設けられる）より外部に導出され、 前記第１，第２端末をそれぞれ始端（巻き始め端）とす
る光ファイバ（第１，第２光ファイバと言う）が、前記
ボビンに少なくとも所定の対数（ｎ）巻線され（第１，
第２光ファイバを１層ずつ重ねて巻いたものを１対とす
る、しかし各対の第１，第２光ファイバはいずれが先に
巻かれていてもよい）、 第１，第２光ファイバの巻き終り端が融着接続されてい
ることを特徴とする光ファイバコイル。3. Both ends of the optical fiber coil (first and second ends)
An optical fiber (referred to as a terminal) is led out through a hole (provided near the position of the first layer) of a flange of the bobbin, and the first and second terminals are respectively a starting end (a winding start end). First and second optical fibers) are wound around the bobbin at least by a predetermined number of logs (n) (first and second optical fibers).
A pair is formed by winding the second optical fiber one layer at a time, but any one of the first and second optical fibers of each pair may be wound first), the first and second optical fibers An optical fiber coil, wherein a winding end end of the optical fiber coil is fusion-spliced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20969295A JP2849737B2 (en) | 1995-08-17 | 1995-08-17 | Optical fiber coil and its winding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20969295A JP2849737B2 (en) | 1995-08-17 | 1995-08-17 | Optical fiber coil and its winding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0953945A JPH0953945A (en) | 1997-02-25 |
| JP2849737B2 true JP2849737B2 (en) | 1999-01-27 |
Family
ID=16577059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20969295A Expired - Fee Related JP2849737B2 (en) | 1995-08-17 | 1995-08-17 | Optical fiber coil and its winding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2849737B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2860493B1 (en) | 2012-06-12 | 2018-04-25 | Tokyo Keiki Inc. | Sensing coil for fiber optic gyroscopes and manufacturing method for same |
-
1995
- 1995-08-17 JP JP20969295A patent/JP2849737B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0953945A (en) | 1997-02-25 |
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