JP2001290059A - Optical fiber cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a optical fiber cord which allows aligned dense winding without the deformation of the optical fiber cord to an elliptic shape when winding the optical fiber cord to an optical fiber cord spool. SOLUTION: The optical fiber cord 16 constituted by disposing a tension fiber layer 14 and a cord coating layer 15 on a coated optical fiber 13 is formed to a state that the cord coating layer 15 partly infiltrates the outer segment of the tension fiber layer 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cord used for communication of a high-speed moving body or the like.

[0002]

2. Description of the Related Art Conventionally, a moving body such as a moving body moving at a high speed, a moving body moving in the sea, and a device for controlling these moving bodies are connected to each other and an optical fiber code is used as a communication code for controlling the moving body. Is used. FIG. 3 shows an example of an optical fiber cord used for such mobile communication. This optical fiber cord 6 is formed by forming a coating layer 2 made of an ultraviolet curable resin or the like on an optical fiber bare wire 1 having an outer diameter of 125 μm.
Aramid fiber around the optical fiber core 3
A tensile fiber layer 4 is formed by longitudinally adding tensile fibers made of carbon fiber or the like, and a cord coating layer 5 is provided on the tensile fiber layer 4 by extruding a resin such as nylon into a pipe shape.

As shown in FIG. 2, such an optical fiber cord 6 is wound around a cylindrical bobbin 7 several times (hereinafter referred to as a coil), and is wound inside an optical fiber cord spool 8. Will be accommodated. And the optical fiber cord 6
Is connected to the moving body, and the other end is connected to a device for controlling the moving body. At the time of use, the optical fiber cord spool 8 is attached to a control device or a moving body, and the optical fiber cord 6 is drawn out from the optical fiber cord spool 8 and used by the movement of the moving body. At this time, the winding state of the optical fiber cord 6 around the optical fiber cord spool 8 is such that the winding position of the optical fiber cord 6 is directly above the optical fiber cord 6 located therebelow, as shown in FIG. Aligned tight winding is preferred. With such a closely wound arrangement, the accommodation density of the optical fiber cord 6 is high, and the optical fiber cord 6 can be smoothly fed from the optical fiber cord spool 8.

[0004]

However, when the optical fiber cord 6 having such a structure is housed in the optical fiber cord spool 8, that is, wound around the bobbin 7, it is crushed in the direction of the center of the winding diameter. ,
Since the cross-sectional shape becomes elliptical, there is a problem that it is difficult to arrange and close winding. Further, in the optical fiber cord 6, the optical fiber cord 6 closer to the surface of the bobbin 7 has a tendency to be crushed by the upper optical fiber cord 6 and to be deformed flat. This is because, in the optical fiber cord 6, the cord covering layer 5 provided on the tensile strength fiber layer 4 is formed in a pipe shape by extrusion coating. It is considered that a gap is generated between the cord covering layers 5 and the cord covering layer 5 is easily deformed by an external stress.

FIG. 4 shows a state of the optical fiber cord 6 when the optical fiber cord 6 is wound around the bobbin 7 with a tensile force of 1 kg. As shown in FIG.
If the optical fiber cord 6a is crushed and formed into an elliptical shape, the position of the optical fiber cord 6b to be wound thereon cannot be determined. Cannot be performed, and winding disturbance occurs. When such turbulence occurs, the accommodation density of the optical fiber cord 6 in the optical fiber cord spool 8 decreases. Also, due to such a turbulence of the optical fiber cord 6,
There are problems such as an increase in the loss of the optical fiber cord 6 and a problem that the feeding of the optical fiber cord 6 from the optical fiber spool 8 does not smoothly proceed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and when the optical fiber cord is wound around an optical fiber cord spool, the optical fiber cord does not deform into an elliptical shape.
An object of the present invention is to obtain an optical fiber scord that can be aligned and densely wound.

[0007]

An object of the present invention is to provide an optical fiber cord in which a tensile strength fiber layer and a cord covering layer are provided on an optical fiber core, and a part of the cord covering layer is provided outside the tensile strength fiber layer. Is solved, that is, by making the optical fiber cord a solid type structure. At this time, the optical fiber cord is tensioned at 1 kg,
The flatness of the optical fiber cord when wound around the bobbin so as to have a winding diameter of 10 cm is desirably 6% or less.

[0008]

FIG. 1 shows an example of an optical fiber cord according to the present invention. In the figure, reference numeral 11 denotes an optical fiber bare wire. The bare optical fiber 11 has an outer diameter of 125 μm.
Is used, but the present invention is not limited to this. On the bare optical fiber 11, a coating layer 12 formed by applying and curing an ultraviolet curable resin or the like is provided to form an optical fiber core 13. The outer diameter of the optical fiber core 13 is about 250 to 400 μm.

A tensile fiber such as aramid fiber, glass fiber, carbon fiber or the like is longitudinally added to the outer periphery of the optical fiber core 13 to form a tensile fiber layer 14. Then, on these tensile strength fiber layers 14, nylon 11, nylon 1
A cord coating layer 15 made of a polyamide resin such as No. 2 is provided. At this time, a part of the cord covering layer 15 has entered the outer part of the tensile strength fiber 14. Therefore, in the optical fiber cord 16, the boundary portion between the tensile strength fiber 14 and the cord coating layer 15 is in a tightly contacted state without any gap, that is, a solid structure.

In this case, the volume ratio of the penetration portion of the cord coating layer 15 in the tensile strength fiber layer 14 is preferably set to 8 to 15% by volume with respect to the tensile strength fiber layer 14. If it is less than 8%, the effect of reinforcing the shape by the tensile strength fiber 13 is not exhibited, and if it exceeds 15%, the tensile strength fiber layer 1
4 is disordered.

A boundary portion between the tensile strength fiber layer 14 and the cord covering layer 15 in the optical fiber cord 16 is in a state in which resin has entered the fiber layer. Therefore, since the movement of the tensile strength fiber layer 14 is suppressed by the reinforcing effect of the resin, the optical fiber cord 16 is hardly deformed. Further, since there is no gap between the tensile strength fiber 14 and the cord covering layer 15, the tensile strength fiber layer 14 does not move left and right and the optical fiber cord 16 does not deform into a flat shape.

In the optical fiber cord 16, in order for the cord covering layer 15 to enter the outer portion of the tensile strength fiber layer 14, the tensile strength fibers are bundled around the optical fiber core 13, and the tensile strength fibers are It is made possible by melt-extruding the resin that will become the cord coating layer 15 directly on the top.

At this time, the Young's modulus of the resin forming the cord coating layer 15 is desirably about 100 to 200 kg / mm ² . If it is 100 kg / mm ² ,
It becomes difficult to maintain the shape of the optical fiber cord 16 when wound, and if it exceeds 200 kg / mm ² , local bending (bending at a peel point or the like at the time of feeding out) occurs, and breakage of the cord coating layer 15 occurs. It will be. The thickness of the cord covering layer 15 is 10
0 to 150 μm, and the outer diameter of the optical fiber cord is 8
It is set to 00 to 900 μm.

In the case of the optical fiber cord 16 having such a structure, for example, a tensile force of 1 kg and an outer diameter of 10 cm
The flatness of the optical fiber cord 16 when it is wound around the bobbin 7 having a (winding diameter) can be 6% or less. The flatness represents {(longest diameter−shortest diameter) / (standard outer diameter before winding) × 100 (%)}. If the flatness is 6% or less, the optical fiber cord spool 8
If the value exceeds this value, the optical fiber cord 16 cannot be aligned and tightly wound, and the winding will be disturbed, and it will be difficult to wind and unwind the optical fiber cord 16 around the optical fiber cord spool 8. Become.

As described above, according to the optical fiber cord 16, the outer portion of the tensile strength fiber layer 14 is in a state in which a part of the cord covering layer 15 has penetrated the tensile strength fiber, and the tensile strength fiber layer 14 and the cord covering layer 15 Since there is no gap between the optical fiber cord 16 and the coil, the optical fiber cord 16 can be aligned and tightly wound on the bobbin 7 without being deformed into a flat shape at the time of coiling. Accordingly, the optical fiber cord 16 can be accommodated in the optical fiber cord spool 8 at a high accommodation density, and an increase in loss of the optical fiber cord 16 due to turbulence can be prevented. In addition, if the optical fiber cord 16 can be aligned and densely wound, the optical fiber cord spool 8
From the machine becomes smooth. Therefore, it can be suitably used as an optical fiber cord for mobile communication.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. EXAMPLE An ultraviolet curable resin was applied to a bare optical fiber having a diameter of 125 μm and cured to obtain an optical fiber core having a diameter of 400 μm. 195 denier aramid fibers were used as tensile strength fibers, six of which were longitudinally attached uniformly around the optical fiber cord, and nylon 12 was directly extrusion-coated on the tensile strength fibers. Nylon 12 was made to penetrate into the outer portion of the fiber, and was extruded to have the outer diameter of the optical fiber cord to form a cord coating layer, thereby producing an optical fiber cord having an outer diameter of 850 μm. At this time, the resin impregnation rate in the tensile strength fiber layer was 1
It was 0% by volume.

(Comparative Example) Diameter 400 μm used in Examples
Six 195 denier aramid fibers as tensile strength fibers are uniformly longitudinally attached to the periphery of the optical fiber core wire, and nylon 1 is wound around the tensile strength fiber.
2 was extruded in a pipe shape to form a cord coating layer, and an optical fiber cord having an outer diameter of 850 μm was manufactured.

Next, the optical fiber cord 10 km of the embodiment and the comparative example was wound around the optical fiber cord spool 8 having the structure shown in FIG. At this time, the tensile force at the time of winding was 1 kg, and the outer diameter of the bobbin 7 of the optical fiber cord spool 8 was 10 cm (winding diameter). As a result, in the optical fiber cord of the embodiment, on the bobbin 7, FIG.
The optical fiber cord was able to be wound by the close alignment winding as shown in FIG. At this time, the flatness of the optical fiber cord was 4%. On the other hand, in the optical fiber cord of the comparative example, the optical fiber cord wound on the bobbin surface is flattened and deformed, and the position of the optical fiber cord wound thereon is undetermined. Disorder occurred, and it was not possible to arrange and tightly wind. At this time, the flatness of the optical fiber cord on the bobbin surface was 7%.

[0019]

As described above, according to the optical fiber cord of the present invention, since it has a solid structure in which a part of the cord covering layer penetrates into the outer portion of the tensile strength fiber layer, it does not easily deform into a flat shape. , Can be wound around the bobbin in the optical fiber cord spool in a close aligned winding. In addition, an optical fiber cord that can be closely wound in an aligned manner has a high accommodation density in the optical fiber cord spool, and can be smoothly fed from the optical fiber cord spool. Therefore, with such an optical fiber cord,
It can be suitably used as an optical fiber cord for mobile communication.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an optical fiber cord of the present invention.

FIG. 2 is a cross-sectional view illustrating an example of an optical fiber cord spool.

FIG. 3 is a sectional view showing an example of a conventional optical fiber cord.

FIG. 4 is an enlarged sectional view showing an example of a state of the optical fiber cord when a conventional optical fiber cord is wound around a bobbin.

[Explanation of symbols]

 Reference Signs List 11 bare optical fiber 13 optical fiber core wire 14 tensile fiber layer 15 cord coating layer 16 optical fiber cord 7 bobbin 8 optical fiber cord spool

Claims (2)

[Claims] 1. A tensile fiber layer on an optical fiber core,
An optical fiber cord provided with a cord covering layer, wherein a part of the cord covering layer is penetrated into an outer portion of the tensile strength fiber layer. 2. The flattening rate of the optical fiber cord when the optical fiber cord is wound on a bobbin surface with a winding diameter of 10 cm at a tension of 1 kg is 6% or less. Optical fiber cord.