JPH0324644B2 - - Google Patents
Info
- Publication number
- JPH0324644B2 JPH0324644B2 JP57007301A JP730182A JPH0324644B2 JP H0324644 B2 JPH0324644 B2 JP H0324644B2 JP 57007301 A JP57007301 A JP 57007301A JP 730182 A JP730182 A JP 730182A JP H0324644 B2 JPH0324644 B2 JP H0324644B2
- Authority
- JP
- Japan
- Prior art keywords
- crush
- optical fiber
- resistant layer
- buffer
- fiber cord
- 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.)
- Expired - Lifetime
Links
- 239000013307 optical fiber Substances 0.000 claims description 21
- 230000001681 protective effect Effects 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000012779 reinforcing material Substances 0.000 description 7
- 101100008049 Caenorhabditis elegans cut-5 gene Proteins 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
【発明の詳細な説明】
本発明は光フアイバコードの耐圧潰性能の改良
に係わる発明である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the crush resistance of an optical fiber cord.
すでに広く知られているように、一般に、光フ
アイバコードは第１図の一部皮はぎをした外観図
Ａおよび断面図Ｂにより示すように、光フアイバ
１の外周に、保護のため、緩衝兼補強材２を配置
し、その外周に保護外被３を配した構成を採つて
いる。ところで、上記の光フアイバコード等にお
いては可撓性が要求されるので、保護外被３に塩
化ビニル等の柔かいプラスチツク材料が使用され
る。従つて引張強度は緩衝兼補強材２によつて得
られるが、外力による圧潰に対しては必ずしも強
固な構成とはなつていない。 As is already widely known, optical fiber cords generally have a buffer and a buffer on the outer periphery of the optical fiber 1 for protection, as shown in the external view A and cross-sectional view B in which the skin is partially peeled off in FIG. A structure is adopted in which a reinforcing material 2 is arranged and a protective jacket 3 is arranged around the outer periphery of the reinforcing material 2. Incidentally, since flexibility is required in the above-mentioned optical fiber cord, etc., a soft plastic material such as vinyl chloride is used for the protective jacket 3. Therefore, although tensile strength is obtained by the buffer/reinforcement material 2, the structure is not necessarily strong against crushing due to external force.
そこで本発明は可撓性はさほど損わないような
耐圧潰層を緩衝兼補強材２よりなる層の上に形成
し、耐圧潰性を著しく向上させた光フアイバコー
ドを得ようとするものである。 Therefore, the present invention aims to obtain an optical fiber cord with significantly improved crush resistance by forming a crush-resistant layer that does not significantly impair flexibility on the layer made of the buffer/reinforcing material 2. be.
以下図面に示す実施例について説明する。 The embodiments shown in the drawings will be described below.
第２図は一部皮はぎした一実施例の外観を示
す。光フアイバ１を囲み、例えばアラミツド樹脂
ヤーンのような長繊維の緩衝兼補強材２がたてぞ
えされ、コアが形成される。この点はすでに説明
したが従来のものと同じである。 FIG. 2 shows the appearance of one embodiment with the skin partially removed. Surrounding the optical fiber 1, a long fiber cushioning/reinforcing material 2, such as aramid resin yarn, is arranged to form a core. This point has already been explained and is the same as the conventional one.
この上に耐圧潰層４が設けられ、更に従来どお
り保護外被３が形成される。 A crush-resistant layer 4 is provided on top of this, and a protective jacket 3 is further formed in a conventional manner.
前記耐圧潰層４は従来のコードの外被に比較し
て硬質プラスチツクを用いる。耐圧潰層４の構造
的特徴は圧潰力に対して充分耐えるような円筒体
を用い、これに可撓性を与えるため、長さ方向に
間欠的に切り込みあるいは極薄肉部を形成して、
可撓性を与える点にあり、外部よりの圧潰力に対
しては通常の円筒部分で対応するようにした点に
ある。 The crush-resistant layer 4 uses a hard plastic as compared to the jacket of conventional cords. The structural characteristics of the crush-resistant layer 4 are that it uses a cylindrical body that can sufficiently withstand crushing force, and in order to give it flexibility, incisions or extremely thin wall parts are formed intermittently in the length direction.
The point is that it provides flexibility, and the point is that the normal cylindrical portion can cope with crushing force from the outside.
第２図の５は耐圧潰層４に形成された内側に達
する切込みである。切込み５は耐圧潰層４上に予
め定められた切込み長さ、切込み巾、切込み間隔
で、均等な可撓性を生じるように、全長に亘り、
その表面において、例えば螺旋状の分布となるよ
うに形成される。 Reference numeral 5 in FIG. 2 indicates a cut that is formed in the crush-resistant layer 4 and reaches the inside. The cuts 5 are made on the crush-resistant layer 4 with predetermined cut lengths, cut widths, and cut intervals over the entire length so as to produce uniform flexibility.
For example, it is formed in a spiral distribution on its surface.
第３図は切込みを形成した他の実施例の耐圧潰
層をなす部分のみの断面を示す。この例において
も可撓性がどの方向にも均等に得られるように、
中心軸線からみて、切込み５が上下左右の４方向
に配置される。 FIG. 3 shows a cross section of only the portion forming the crush-resistant layer of another embodiment in which cuts were formed. In this example, so that flexibility can be obtained evenly in all directions,
When viewed from the central axis, the notches 5 are arranged in four directions: top, bottom, left and right.
第４図は第２図、第３図の実施例の断面を示し
ているが、切込み５は耐圧潰層４において大きく
とられ、その結果、この切込み５の部分における
耐圧潰層の残部４′は小さくなるが、このように
形成すれば、可撓性を増加させることができる。
なおこれら実施例における耐圧潰層４は円筒状の
パイプとして形成されているが、半割円筒や、１
つ割円筒で形成されてもよく、配置後、円筒状と
なればよい。 FIG. 4 shows a cross section of the embodiment shown in FIGS. 2 and 3, in which the cut 5 is made large in the crush-resistant layer 4, and as a result, the remaining part of the crush-resistant layer 4' in the area of the cut 5 is However, if formed in this way, flexibility can be increased.
Although the crush-resistant layer 4 in these embodiments is formed as a cylindrical pipe, it may be formed as a half cylinder or one
It may be formed of a split cylinder, and it is sufficient if it becomes cylindrical after placement.
第５図に耐圧潰層４における完全な切り込みを
やめ、薄肉部１５を残した構成を有する耐圧潰層
４の断面を示す。薄肉部１５を配する位置につい
てはすでに実施例について説明したような考え方
によつて定められる。 FIG. 5 shows a cross section of the crush-resistant layer 4 having a structure in which complete cuts are not made in the crush-resistant layer 4 and a thin wall portion 15 is left. The position at which the thin portion 15 is arranged is determined based on the concept already explained in the embodiments.
また第６図Ａ，Ｂに一部皮はぎした外観図およ
び耐圧潰層のみの断面で、別の実施例を示す。 Another embodiment is shown in FIGS. 6A and 6B with a partially peeled external view and a cross section of only the crush-resistant layer.
この例において耐圧潰層４には全周に亘り間欠
的に環状の薄肉部２５を形成させるか、螺旋状に
薄肉部を形成させる。 In this example, the crush-resistant layer 4 has an annular thin wall portion 25 intermittently formed over its entire circumference, or a spiral thin wall portion is formed thereon.
こゝに、同一径を有する光フアイバ１の上に同
一厚みの緩衝兼補強材２の層を設け、(a)、その上
に軟PVCの保護外被３を施した第１図による従
来の光フアイバコードと(b)、前記緩衝兼補強材２
の上に0.5mm厚の硬質PVCによる耐圧潰層４を設
けたもの（但し、層に切込みなし）に保護外被３
を施したもの、(c)，(b)において耐圧潰層４に第３
図により、切込み５を設けたもの、(d)，(b)におい
て耐圧潰層４に第５図により、薄肉部１５を設け
たものを試作して、たわみおよび外径変形率の試
験を行つた。 Here, a layer of a buffer/reinforcing material 2 of the same thickness is provided on an optical fiber 1 having the same diameter, and (a) a protective jacket 3 of soft PVC is applied thereon. Optical fiber cord and (b) the buffer/reinforcing material 2
A crush-resistant layer 4 made of hard PVC with a thickness of 0.5 mm is provided on top (no cuts in the layer), followed by a protective outer covering 3.
In (c) and (b), the crush-resistant layer 4 has a third layer.
Tests were conducted on the deflection and outer diameter deformation of two prototypes, one with the cut 5 shown in the figure, and the other with the crush-resistant layer 4 in (d) and (b) provided with the thin-walled part 15 as shown in Figure 5. Ivy.
試験の都合上、(a)については、耐圧潰層４がな
い関係で、外径が１mm程度小さい。 Due to the convenience of the test, the outer diameter of (a) is about 1 mm smaller since there is no crush-resistant layer 4.
これらの試験方法についてはそれぞれの試験結
果を示す第７図の曲げ荷重Ｗ（Kg）に対するたわ
みｔ（mm）のグラフおよび第８図の圧潰荷重Ｗ
（Kg／cm）に対する外径変形率D′／Ｄのグラフに
示される。この試験結果によれば、本発明による
コードは従来の単心光フアイバコードに比較して
可撓性が多少悪化することは避けられないが、耐
圧潰性（荷重に対する外径変化）は明らかに向上
していることがわかる。 Regarding these test methods, the graph of deflection t (mm) against bending load W (Kg) is shown in Figure 7 and the crushing load W is shown in Figure 8, which shows the respective test results.
It is shown in the graph of the outer diameter deformation rate D'/D versus (Kg/cm). According to the test results, although it is inevitable that the cord according to the present invention has some deterioration in flexibility compared to the conventional single-core optical fiber cord, the crush resistance (outer diameter change in response to load) is clearly improved. I can see that it is improving.
以上説明したところから理解されるように、第
１図に示すような従来の光フアイバコードによれ
ば、引張りに対する強度はあるが、外周からの圧
潰力には弱く、使用中誤つて踏みつけるようなこ
とがあれば破損を生ずるおそれや、伝送損失を増
加させるおそれがあつた。それ故耐圧潰性を要す
るものについては、更に鎧装や外被を施したり、
保護管に入れて使用されるが、これでは可撓性が
著しく損われてコードとは呼べず、使用上も制限
されるきらいがあつた。 As can be understood from the above explanation, although the conventional optical fiber cord shown in Figure 1 has tensile strength, it is weak against crushing force from the outer periphery, and it is easy to accidentally step on it during use. If this happens, there is a risk of damage or an increase in transmission loss. Therefore, for items that require crush resistance, they may be further armored or coated.
It is used in a protective tube, but its flexibility is so severely impaired that it cannot be called a cord, and its use tends to be limited.
本発明はこれらの問題点を十分解決したもので
あり、実使用面において、その期待される効果に
は大きなものがある。 The present invention has sufficiently solved these problems, and is expected to have significant effects in practical use.
なお、本発明は単心光フアイバコードより太い
多心の光フアイバーコードに適用し得るのみでな
く、圧潰に弱い通常の絶縁銅心線を内包するコー
ド等にも適用し得ることはいうまでもない。 It goes without saying that the present invention can be applied not only to multi-core optical fiber cords that are thicker than single-core optical fiber cords, but also to cords that include ordinary insulated copper core wires that are susceptible to crushing. do not have.
第１図Ａ，Ｂは従来の光フアイバコードの一部
皮はぎした外観および断面を示す。第２図は本発
明の一実施例の一部皮はぎした外観を示す。第３
図は切込みを形成した本発明の耐圧潰層の一実施
例の長さ方向断面を示す。第４図は本発明の耐圧
潰層の一実施例の横断面を示す。第５図は薄肉部
を形成した本発明の耐圧潰層の一実施例の長さ方
向断面を示す。第６図Ａ，Ｂは薄肉部を有する本
発明の一実施の一部皮はぎした外観および耐圧潰
層のみの長さ方向断面を示す。第７図は本発明の
光フアイバコードと従来の光フアイバコードとの
たわみ試験の結果を示すグラフである。第８図は
本発明の光フアイバコードと従来の光フアイバコ
ードとの外径率変形試験の結果を示すグラフであ
る。
１…光フアイバ、２…緩衝兼補強材、３…保護
外被、４…耐圧潰層、５…切込み、１５，２５…
薄肉部。
FIGS. 1A and 1B show a partially stripped exterior and cross-section of a conventional optical fiber cord. FIG. 2 shows a partially stripped exterior view of one embodiment of the invention. Third
The figure shows a longitudinal section of an embodiment of the crush-resistant layer of the present invention with cuts formed therein. FIG. 4 shows a cross section of an embodiment of the crush-resistant layer of the present invention. FIG. 5 shows a longitudinal cross-section of an embodiment of the crush-resistant layer of the present invention in which a thin portion is formed. FIGS. 6A and 6B show a partially stripped exterior view of an embodiment of the present invention having a thin wall section and a longitudinal cross-section of only the crush-resistant layer. FIG. 7 is a graph showing the results of a deflection test between the optical fiber cord of the present invention and the conventional optical fiber cord. FIG. 8 is a graph showing the results of an outer diameter ratio deformation test of the optical fiber cord of the present invention and the conventional optical fiber cord. DESCRIPTION OF SYMBOLS 1... Optical fiber, 2... Buffering and reinforcing material, 3... Protective outer cover, 4... Crush-resistant layer, 5... Notch, 15, 25...
Thin wall part.
Claims (1)
材を配置し、その外周に保護外被を配した光フア
イバコードにおいて、緩衝兼補強材と保護外被の
間に、切り込み、または薄肉部を長さ方向で間欠
的に有する硬質プラスチツクよりなる耐圧潰層を
設けたことを特徴とする光フアイバコード。1. In optical fiber cords in which a buffer/reinforcement member is placed around the outer periphery of the optical fiber for protection and a protective jacket is arranged around the outer periphery, a cut or a thin part is made long between the buffer/reinforcement member and the protective jacket. An optical fiber cord characterized in that a crush-resistant layer made of hard plastic is provided intermittently in the longitudinal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57007301A JPS58123503A (en) | 1982-01-19 | 1982-01-19 | Optical fiber cord |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57007301A JPS58123503A (en) | 1982-01-19 | 1982-01-19 | Optical fiber cord |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58123503A JPS58123503A (en) | 1983-07-22 |
| JPH0324644B2 true JPH0324644B2 (en) | 1991-04-03 |
Family
ID=11662194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57007301A Granted JPS58123503A (en) | 1982-01-19 | 1982-01-19 | Optical fiber cord |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58123503A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5631562A (en) * | 1979-08-21 | 1981-03-30 | Tokuji Kariya | Control valve |
| JPS5723502B2 (en) * | 1979-08-07 | 1982-05-19 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5723502U (en) * | 1980-07-09 | 1982-02-06 |
-
1982
- 1982-01-19 JP JP57007301A patent/JPS58123503A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5723502B2 (en) * | 1979-08-07 | 1982-05-19 | ||
| JPS5631562A (en) * | 1979-08-21 | 1981-03-30 | Tokuji Kariya | Control valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58123503A (en) | 1983-07-22 |
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