JPS62284309A - Manufacture of optical fiber drawing and arranging sheet - Google Patents
Manufacture of optical fiber drawing and arranging sheetInfo
- Publication number
- JPS62284309A JPS62284309A JP61127692A JP12769286A JPS62284309A JP S62284309 A JPS62284309 A JP S62284309A JP 61127692 A JP61127692 A JP 61127692A JP 12769286 A JP12769286 A JP 12769286A JP S62284309 A JPS62284309 A JP S62284309A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- drum
- frame
- sheet
- angle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 81
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 238000012681 fiber drawing Methods 0.000 title abstract 3
- 238000004804 winding Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000013308 plastic optical fiber Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 206010073261 Ovarian theca cell tumour Diseases 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 208000001644 thecoma Diseases 0.000 description 1
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【発明の詳細な説明】
３発明の詳細な説明
〔産業上の利用分野〕
本発明は光学繊維引揃えシートの製造方法に関するもの
であり、とくに光学繊維引揃えシートの両端部に配され
た光学繊維端部の相互位置関係が１対１なる関係を十分
に保持できる光学繊維引揃えシートの製造法に関するも
のである。Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for manufacturing an optical fiber alignment sheet, and particularly relates to a method for manufacturing an optical fiber alignment sheet. The present invention relates to a method for manufacturing an optical fiber alignment sheet that can sufficiently maintain a one-to-one positional relationship between fiber ends.
多数本の光学繊維を一列にシート状に整列し九光学繊維
引揃えシートは複写機のラインライトとして或いはライ
ンポイントセンサーとして更にはこの光学繊維シートを
積層して画像伝送マルチ光フアイバーセンサーとして広
く利用さｎるようになってきている。A large number of optical fibers are arranged in a sheet shape, and the nine-optical fiber alignment sheet is widely used as a line light of a copying machine or as a line point sensor.Furthermore, this optical fiber sheet is laminated to be widely used as an image transmission multi-optical fiber sensor. I'm starting to feel sad.
これら光学繊維センサーに要求される基本特性は光学繊
維シートの両端面に配さｆＬ次次光光学繊維位置関係が
１対１なる関係を満足していなけｎばならず、かつ光学
繊維の配列状態がライン状に整列さｎていることが必要
である。 ′このような光学繊維シート全作る次め
に従来開発されてキ友方法は、カセ取り法や第２図に示
し元如くドラム面（２２）に繊維引き揃え用溝（２３）
を設は友捲取りドラム（２１）或いは第３図に示す如く
ドラム面（３２）に接する光学繊維押えローラ（３３）
′を設けｔ捲取りドラム（３１）等を利用し友ドラム潅
取り法が知られており、更には米国特許第４９８９，５
７８号公報に示さｎ友光学繊維引揃えシートの製造方法
が知られている。The basic characteristics required of these optical fiber sensors are that the positional relationship of the fL-order optical fibers arranged on both end faces of the optical fiber sheet must satisfy a one-to-one relationship, and the arrangement state of the optical fibers must be satisfied. It is necessary that n be arranged in a line. 'Next, conventionally developed methods for making all such optical fiber sheets include the skein removal method and the fiber alignment grooves (23) on the drum surface (22) as shown in Figure 2.
The optical fiber pressing roller (33) is in contact with the winding drum (21) or the drum surface (32) as shown in Fig. 3.
A drum cleaning method is known in which a winding drum (31) is provided with
A method for producing an aligned optical fiber sheet is known as disclosed in Japanese Patent No. 78.
上述し交光学繊維引揃えシート作成法のうちカセ取り法
にて作ら′ｉ″Ｌ′ｆｃ光学繊維シートはその端面部に
おける光学繊維の重なジ合い状部の多発したものとなシ
ラインポイントセンサーやラインライトガイドなどとし
て利用し得る光学繊維シートの製法としての適正はほと
んどない。The 'i''L'fc optical fiber sheet produced by the skein-cutting method among the above-mentioned methods for producing aligned optical fiber sheets has many jagged parts where the optical fibers overlap at the end face. There is almost no suitable method for manufacturing optical fiber sheets that can be used as sensors, line light guides, etc.
これに対し、第２図ま几は第３図に示し文如き光学繊維
捲取りドラム士利用し之光学繊維シートの製造法にて作
られ几ものは、カセ捲取り法にて作られ次光学繊維の引
き揃えシートに比べ光学繊維の重なり部の発生割合は著
しく少な示しｔ如くドラム（４１）の面に間隙部（４３
）と光学繊維の重量部（４４） 、 （４５）等が少な
い割合ではあるが含まれておジ、この方法によって作ら
れた光学繊維ンートヲセンサーとして使用するにはまだ
多くの改良すべき点があるとさｎている。On the other hand, the method shown in Figure 2 is made using an optical fiber sheet manufacturing method using an optical fiber winding drum as shown in Figure 3. Compared to a sheet of aligned fibers, the proportion of overlapping optical fibers is significantly lower.As shown in FIG.
) and optical fiber weight parts (44), (45), etc., although it is a small proportion, there are still many points to be improved before the optical fiber made by this method can be used as a sensor. It is said that there is.
一方、米国特許第３．９８９．５７８号に示さｎ文光学
轍維引揃えシートの製法は、用いる光学繊維の直径に見
合う溝幅金偏え九第５図に示す如き光学繊維引揃えガイ
ドまたはフレームを光学繊維引揃えローラガイドの一部
に設け、この溝ガイドｔｍはフレームの中で光学繊維の
配列を行わしめる方法である。On the other hand, the manufacturing method of the n-shaped optical fiber alignment sheet shown in U.S. Pat. A frame is provided as a part of the optical fiber alignment roller guide, and this groove guide tm is a method for arranging optical fibers within the frame.
この方法は用いる光学繊維の直径とガイドま九はフレー
ムの溝幅との関係が適合し之場合には、光学繊維の配列
性が良好な光学繊維引揃えシートを作ることができる。In this method, if the relationship between the diameter of the optical fibers used and the groove width of the guide hole and frame is compatible, it is possible to produce an optical fiber alignment sheet with good alignment of the optical fibers.
ところが用いる光学繊維はその長手方向での径が常に一
定のもの７作ることは極めて難かしいことによる繊度斑
があり、このような光学繊維を上記の如さガイドまたは
フレームにて整列すると第５図中の（５２）に示し文如
く光学繊維が千鳥定状に配列されｔものとなり易く、こ
のような配列構造の光学繊維シートではラインポイント
センサーなどのセンサーとして利用は極めて難かしい。However, it is extremely difficult to make the optical fibers used to have a constant diameter in the longitudinal direction7, which results in uneven fineness.If such optical fibers are aligned with a guide or frame as described above, the diameter shown in Fig. 5 is obtained. As shown in (52), the optical fibers tend to be arranged in a staggered pattern, making it extremely difficult to use an optical fiber sheet with such an arrangement structure as a sensor such as a line point sensor.
また光学繊維引揃えシートを作るに際して用いる光学繊
維の径も多種のものが用いら九でおり１種類のガイドま
たはフレームで多種の光学繊維引揃えシートを作ること
は不可能である。In addition, there are many different diameters of optical fibers used in making optical fiber alignment sheets, and it is impossible to make various types of optical fiber alignment sheets using one type of guide or frame.
そこで本発明者等は上述した如き不都合のない光学繊維
引揃えシートに得るべく検討しｔ結果本発明を完成し次
。本発明の要旨とするところは、糸整列捲取りドラム、
糸整列用コマ、コマ送りバー、トラバースガイドよりな
る部材をコマを回転自在な状態でコマ送り用バーに挿入
するとともに、コマ外周辺ドラム面と密接するように保
持しコマ送り用バーをその軸がドラムの回転軸に対し角
度θｌとなるように配しトラバースガイドとドラム面上
のコマ接触点金納ぶ直線とドラム回転軸に対する垂直軸
との角度全０２とし友ときトラバースガイドとコマとの
位置関係が次式
％式％（１）
なる関係を満足するように配し、トラバースガイドを移
動せしめながらトラバースガイドカラドラム面のコマ接
触点内側へ供給してドラム全回転しドラム面上に光学繊
維の引揃えシート’を形成せしめることを特徴とする光
学繊維引揃えシートの製造方法にある。Therefore, the inventors of the present invention conducted studies to obtain an optical fiber alignment sheet that does not have the above-mentioned disadvantages, and as a result, completed the present invention. The gist of the present invention is to provide a yarn alignment winding drum;
Insert the thread alignment piece, frame feed bar, and traverse guide into the frame feed bar in a rotatable state, and hold the frame so that it is in close contact with the drum surface around the outside of the frame, and move the frame feed bar to its axis. The position of the traverse guide and the top is such that the total angle between the straight line where the traverse guide and the top contact point on the drum surface and the perpendicular axis to the drum rotation axis is 0. The optical fibers are arranged so that the relationship satisfies the following formula % formula % (1), and the traverse guide is moved to the inside of the contact point of the frame on the traverse guide collar drum surface, and the drum is rotated completely and the optical fiber is placed on the drum surface. 1. A method for producing an optical fiber alignment sheet, comprising: forming an alignment sheet.
本発明の実施概略図を第１図に示しｔ０同図中（１）は
光学繊維引揃えシート捲取りドラムであり（３）は糸整
列用コマであり、このコマの外周辺は常にドラム面に接
するように保持され、回転自在な状態でコマ送り用バー
（２）に挿入さｎている。このバー（２）はその軸がド
ラム回転軸に対しθ１なる角度全保つようにしである。A schematic diagram of the implementation of the present invention is shown in FIG. It is held so as to be in contact with the frame feed bar (2) and inserted into the frame feed bar (2) in a freely rotatable state. This bar (2) is designed so that its axis maintains an angle of θ1 with respect to the drum rotation axis.
１之トラバースガイド（５）Ｈトラバースガイド（５）
とコマ（３）とを結ぶ直線とドラム回転軸に対し次層直
軸との角度が０２となるように保っである。1 Traverse Guide (5) H Traverse Guide (5)
The angle between the straight line connecting the frame (3) and the next layer's direct axis relative to the drum rotation axis is 02.
かくの如き装置を用い光学繊維をトラバースガイドより
ドラム面上のコマの引揃えシート作成側に供給しドラム
の回転を開始し、光学繊維引揃えシートを作成し几場合
の効果を第６図に示し友。同図中ＯＰはコマ送り用バー
（２）がドラムの回転軸ＯＰに対し角度θｌで配されて
いる。Using such a device, the optical fibers are fed from the traverse guide to the sheet-forming side for aligning the frames on the drum surface, the drum starts rotating, and the sheet for aligning the optical fibers is created. The effect of the process is shown in Figure 6. Show friend. In OP in the figure, a frame feeding bar (2) is arranged at an angle θl with respect to the rotation axis OP of the drum.
トラバースガイドより光学繊維を供給レトラバースさせ
ながら一定時間ドラムを回転すると糸整列用コマはバー
上を点０から点Ｐまで移動しこのときコマによりドラム
面で光学繊維シート作成ずみ側へ加えらｎる力は図中Ｏ
Ｒなるものなる。Optical fibers are supplied from the traverse guide. When the drum is rotated for a certain period of time while retraversing, the thread alignment piece moves on the bar from point 0 to point P, and at this time, the thread alignment piece is added to the drum surface on the side where the optical fiber sheet has been made. The force is O in the diagram.
R becomes.
一方、光学繊維のドラム面上での引揃えシート禾完成側
へ加わる力はトラバースガイドの移動速度であり、この
力とＯＲで示しｔ力とがバランスよく保几れ次とき始め
て第４図に示し九如き光学繊維整列欠陥のない光学繊維
引揃えシートを作ることができるのである。On the other hand, the force applied to the completed side of the aligned sheet on the drum surface of the optical fiber is the moving speed of the traverse guide, and it is only when this force and the t force, expressed as OR, are maintained in a well-balanced manner that the result shown in Fig. 4 is obtained. Therefore, it is possible to produce an optical fiber alignment sheet free of optical fiber alignment defects as shown in FIG.
とするのが良い。θｌが零度の場合は糸整列用コマによ
って光学繊維にドラム面上で光学繊維シート側に加えら
れる力はほとんど働かず、第４図中の（４２）で示した
間隙部や（４３） 、 （４４）で示し九光学繊維の重
なり部の多発した光学繊維シートしか作ることができな
い。一方この角度θ１が約４５°を越えた大きなものと
なると、コマによりドラム面上で光学繊維にシート作成
側に加えらｎる力は過大なものとなり光学繊維のｌなり
部の多発した光学繊維シートしか作ることができない。It is better to When θl is zero, the force applied to the optical fiber by the thread alignment piece on the drum surface towards the optical fiber sheet side is hardly applied, and the force is applied to the optical fiber sheet side on the drum surface, and the gap shown in (42) in Fig. 4 and (43), ( Only the optical fiber sheet shown in 44) in which nine optical fibers overlap each other can be produced. On the other hand, if this angle θ1 becomes large, exceeding about 45°, the force applied to the optical fibers on the drum surface toward the sheet making side by the coma becomes excessive, and the optical fibers are exposed to a large number of bent portions of the optical fibers. Only sheets can be made.
また角度θ鵞は次式
％式％
なる関係を満足し、かつ３０°を越えない範囲の角度で
あることが必要である。θ２が３０°を越えて大きくな
るとトラバースガイドによる光学繊維のドラム面上での
引揃未完側へ加えらｎる力（８）が過大となり間隙の多
い光学繊維引揃えシートしか作九なくなる。ま之θ２は
３０°以下なる条件を満之していても、その角度が５０
を越えて大きくなると、やはり第６図中のＯＲで示さｎ
る力よりも（８）で示した外側方向への力が勝るように
なり、この場合にも間隙の多い光学繊維引揃えシートし
か作ることはできない。It is also necessary that the angle θ satisfies the following relationship and is an angle that does not exceed 30°. When θ2 increases beyond 30°, the force (8) applied by the traverse guide to the unaligned side of the optical fibers on the drum surface becomes excessive, and only optical fiber alignment sheets with large gaps can be produced. Even if the condition that the angle θ2 is 30 degrees or less is satisfied, the angle is 50 degrees.
When it becomes larger than n, it is also indicated by OR in Figure 6.
The force in the outward direction shown in (8) becomes stronger than the force in the outward direction, and in this case as well, it is only possible to produce an aligned optical fiber sheet with many gaps.
まｔ未整列用コマの形状としては第７図に示す如き断面
形状の回転自在なものであ九ばいずｎのものをも用いる
ことができコマを構成する素材としてはＡＢＳ樹脂、ポ
リエステル樹脂、ポリアミド樹脂などのプラスチックで
作られ几ものであることが引揃える光学繊維、炭素繊維
等に損傷を与えないという点から好ましい。As for the shape of the unaligned pieces, a rotatable one with a cross-sectional shape as shown in FIG. 7 can also be used. Materials for making the pieces include ABS resin, polyester resin, It is preferable that the material is made of plastic such as polyamide resin and is sturdy because it will not damage the optical fibers, carbon fibers, etc. to be arranged.
以下実施例によｐ本発明を更に詳細に説明する。The present invention will be explained in more detail with reference to Examples below.
実施例１
第１図に示すような製造設備を用いて光学繊維引揃えシ
ートを製造し友。Example 1 An optical fiber alignment sheet was manufactured using manufacturing equipment as shown in FIG.
すなわち直径α２５鵡のプラスチック製光学繊維を用い
、第１図中の０１を３°、５°、１ｏ０及び１５°に変
え、ま友θ２全３０°を越えない範囲でかつ０≦θ２≦
５θｌ を満足する角度でドラム（りを回転し４種の光
学繊維引揃えンートヲ製造したところ、第４図に示すよ
うな間隙部（４３）や重なり合い部（４４）、 （４５
）等の欠陥のない引揃え精度の高いシートが得られた。That is, using a plastic optical fiber with a diameter of α25, change 01 in Fig. 1 to 3°, 5°, 1o0, and 15°, and set the angle θ2 within a range not exceeding 30° and 0≦θ2≦
By rotating the drum at an angle that satisfies 5θl, four types of optical fiber alignment threads were manufactured, and as shown in Figure 4, there were gaps (43), overlapping parts (44),
) and other defects with high alignment accuracy were obtained.
実施例２
直径２ｍのプラスチック製光学繊維を用い第１図中のθ
１を１５°、１８°、２０°及び２５°に変、え、ま友
θ２を３０°を越えない範囲でかつ０≦０２≦５０１
を満足する角度でドラム（１）全回転し４種の光学繊維
引揃えシートを製造し友ところ、実施例１と同様、欠陥
のない引揃え精度の高いシートが得られ九〇
〔発明の効果〕
本発明の方法によって作らｎｆｃ光学繊維引揃えシート
は第４図に示しｔ如き光学繊維引揃え間隙部や光学繊維
型なり部の全くないものであり、それ故得られ友光学繊
維シートの両端面に存在する各光学繊維の位置関係は１
対１なる関係を保持している。従って本発明によって得
九光学繊維シートは、ラインライト、ラインポイントセ
ンサー、画像伝送用マルチファイバーセンサーなどのセ
ンサー類等その引揃え精度の高いことが要求される分野
において十分用いることができるものである。Example 2 Using a plastic optical fiber with a diameter of 2 m, θ in FIG.
1 to 15°, 18°, 20° and 25°, then rotate the drum (1) fully at an angle that does not exceed 30° and satisfies 0≦02≦501. When producing an optical fiber alignment sheet, a sheet with no defects and high alignment accuracy was obtained as in Example 1.90 [Effects of the Invention] The NFC optical fiber alignment sheet produced by the method of the present invention was There is no optical fiber aligning gap or optical fiber forming part as shown in Figure 4, and therefore the positional relationship of each optical fiber present on both end surfaces of the obtained optical fiber sheet is 1.
Maintains a one-to-one relationship. Therefore, the nine optical fiber sheets obtained according to the present invention can be fully used in fields where high alignment accuracy is required, such as sensors such as line lights, line point sensors, and multi-fiber sensors for image transmission. .
第１図は本発明の方法を示す実施する一例を示す斜視図
であり、第２図、第３図は従来開発され几方法の例を示
す斜視図を、第４図は捲取りドラム上でシートを作成し
几ときに作らｎ友光学繊維配列シートの欠陥を示す断面
図であり、第５図は従来例で用いられ九光学繊維引揃え
治具の断面図であり、第６図は第１図の糸整列コマ部の
拡大図を、第７図は未整列用コマの正面図である。
（１） 糸整列シート捲取りドラム
（２） コマ送り用バー
（３）未整列用コマ
（４） 糸整列コマ面を通るドラム回転軸に平行な線
（５） トラバースガイド
（６）光学繊維
（７） 糸整列コマ面を通るドラム回転軸に直角な線
青ｆ図
青６図
オ フ 図
（イ） （ロ）
寸２図FIG. 1 is a perspective view showing an example of implementing the method of the present invention, FIGS. 2 and 3 are perspective views showing an example of a conventionally developed method, and FIG. FIG. 5 is a cross-sectional view showing defects in the N-optical fiber alignment sheet made during the preparation of the sheet; FIG. 5 is a cross-sectional view of a nine-optical fiber alignment jig used in the conventional example; FIG. 7 is an enlarged view of the yarn alignment piece shown in FIG. 1, and a front view of the unaligned piece. (1) Yarn alignment sheet winding drum (2) Frame feed bar (3) Unaligned piece (4) Line parallel to the drum rotation axis passing through the yarn alignment piece surface (5) Traverse guide (6) Optical fiber ( 7) A line perpendicular to the drum rotation axis passing through the thread alignment piece surface Blue f diagram Blue diagram 6 Off Figure (A) (B) Size 2 diagram
Claims (1)
バー及びトラバースガイドよりなる部材をコマを回転自
在な状態でコマ送り用バーに挿入するとともに、その外
周辺をドラム面に密接するように保持し、コマ送り用バ
ーをその軸が、ドラムの回転軸に対し角度θ＿１となる
ように配し、トラバースガイドとドラム面上のコマ接触
点を結ぶ直線とドラム回転軸に対する垂直軸との角度を
θ＿２としたときトラバースガイドと糸送り用コマとの
位置関係が次式 ０°≦θ＿２≦５θ＿１ なる関係を満足し、かつ３０°を越えないように配し、
トラバースガイドより光学繊維をドラム面上のコマの内
側に配されるように供給してドラムを回転し、ドラム面
上に光学繊維引揃えシートを製造することを特徴とする
光学繊維引揃えシートの製造方法。[Claims] A member consisting of a yarn alignment sheet winding drum, a yarn alignment piece, a frame feed bar, and a traverse guide is inserted into the frame feed bar in a rotatable state, and the outer periphery of the drum is inserted into the frame feed bar. Hold the bar in close contact with the drum surface, arrange the frame feeding bar so that its axis makes an angle θ_1 to the drum rotation axis, and align the drum rotation axis with the straight line connecting the traverse guide and the frame contact point on the drum surface. When the angle with the vertical axis is θ_2, the positional relationship between the traverse guide and the thread feeding piece satisfies the following formula 0°≦θ_2≦5θ_1 and is arranged so as not to exceed 30°,
An optical fiber alignment sheet characterized in that the optical fiber alignment sheet is manufactured on the drum surface by supplying optical fibers from a traverse guide so as to be arranged inside the pieces on the drum surface and rotating the drum. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61127692A JPS62284309A (en) | 1986-06-02 | 1986-06-02 | Manufacture of optical fiber drawing and arranging sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61127692A JPS62284309A (en) | 1986-06-02 | 1986-06-02 | Manufacture of optical fiber drawing and arranging sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62284309A true JPS62284309A (en) | 1987-12-10 |
Family
ID=14966342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61127692A Pending JPS62284309A (en) | 1986-06-02 | 1986-06-02 | Manufacture of optical fiber drawing and arranging sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62284309A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5021747A (en) * | 1973-06-25 | 1975-03-07 | ||
| JPS51292U (en) * | 1974-06-15 | 1976-01-05 | ||
| JPS59210402A (en) * | 1983-05-13 | 1984-11-29 | Mitsubishi Rayon Co Ltd | Manufacture of optical fiber sheet |
-
1986
- 1986-06-02 JP JP61127692A patent/JPS62284309A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5021747A (en) * | 1973-06-25 | 1975-03-07 | ||
| JPS51292U (en) * | 1974-06-15 | 1976-01-05 | ||
| JPS59210402A (en) * | 1983-05-13 | 1984-11-29 | Mitsubishi Rayon Co Ltd | Manufacture of optical fiber sheet |
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