JP4309039B2 - Fiber optic cable - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical fiber cable mainly used for signal transmission in a moving device.
[0002]
[Prior art]
FIG. 3 shows a cross-sectional view of a conventional optical fiber cable 11. In this optical fiber cable 11, a tension member 13 made of a steel stranded wire rope or the like is provided at the center of a plurality of optical fiber cords 12 that are twisted together, and these are covered with an anticorrosion resin coating layer 14 such as polyurethane. It has a structure.
[0003]
[Problems to be solved by the invention]
The optical fiber cable 11 having the above structure is excellent in strength because the tension member 13 having high rigidity is provided at the center, but has a slight difficulty in bending resistance and twisting resistance, and has a large lateral pressure. When subjected to bending, twisting, etc., physical deformation (plastic deformation) occurs in the optical fiber cord 12 that is in direct contact with the tension member 13, and it becomes difficult to suppress signal transmission loss with high accuracy. was there.
[0004]
The present invention has been made by paying attention to such points, and is capable of securing the desired strength and signal transmission performance, while being excellent in lateral pressure resistance, flex resistance, and twist resistance. An object is to provide a fiber cable.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
[0006]
That is, the optical fiber cable of the invention according to claim 1 includes a plurality of optical fiber cords formed by coating a single optical fiber core wire with a vinyl sheath, and covering the plurality of optical fiber cords with an internal resin coating layer, Cover this resin coating layer with a high-tensile fiber layer, and cover the outside with an external resin coating layer .
And while twisting together the plurality of optical fiber cords, a high-tensile fiber layer is disposed at the center of the plurality of optical fiber cords,
It is characterized by that.
[0007]
An optical fiber cable according to a second aspect of the present invention is the optical fiber cable according to the first aspect, wherein the outer resin coating layer is made of polyurethane .
[0008]
According to the configuration of the invention of claim 1, the high-tensile fiber layer that provides strength against tension is more flexible than a tension member made of a steel stranded wire rope or the like, and can be easily applied to large bending and twisting. Correspond. Further, since the high-tensile fiber layer elastically covers the plurality of optical fiber cords via the inner resin coating layer, the optical fiber cord is unlikely to be physically deformed. The high-tensile fiber layer itself is covered and protected by an external resin coating layer.
[0009]
Moreover, according to the structure of the invention which concerns on Claim 1 , tensile strength performance increases with the high tension fiber layer located in the center of a some optical fiber cord.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 shows an external perspective view of an optical fiber cable 1 according to the present invention, and FIG. 2 shows a longitudinal front view thereof.
[0012]
In this optical fiber cable 1, a plurality of (four in this example) optical fiber cords 2 are twisted as optical fiber wires, and these optical fiber cords 2 are covered with an internal resin coating layer 3 made of a flexible PVC sheath or the like. The inner resin coating layer 2 is covered with a high-tensile fiber layer 4 made of Kepler fiber or aramid fiber, and the outer side is covered with an outer resin coating layer 5 made of a resin material having excellent wear resistance such as polyurethane. ing. A high-tensile fiber layer 6 is also provided at the center of the optical fiber cord 2 group.
[0013]
The present invention can also be implemented in the following forms.
[0014]
(1) The single optical fiber cord 2 can be configured to have a single wire specification in which the inner resin coating layer 3, the high-tensile fiber layer 4, and the outer resin coating layer 5 are covered.
[0015]
(2) In the above-described embodiment, the optical fiber cord 2 in which the optical fiber core wire 2a is covered with the vinyl sheath 2b is illustrated as an optical fiber wire. However, the optical fiber core wire 2a itself is an optical fiber wire. It can also be implemented by a configuration in which it is covered with the inner resin coating layer 3, the high-tensile fiber layer 4, and the outer resin coating layer 5.
[0016]
(3) In the above-described embodiment, the high-tensile fiber layer 6 is also provided at the center of the optical fiber cord 2 group, but without providing the high-tensile fiber layer 4 at the center of the optical fiber cord 2 group, An optical fiber cable can also be configured.
[0017]
【The invention's effect】
As is clear from the above description, the following effects can be expected according to the present invention.
[0018]
According to the first aspect of the present invention, since the tensile strength function is obtained by using the cylindrical high-tensile fiber layer, it is more resistant than the case of using a tension member made of a steel stranded wire rope or the like. The lateral pressure property, the bending resistance, and the twisting resistance can be improved, and in particular, it can be effectively used as a moving optical fiber cable.
[0019]
Moreover, according to the invention which concerns on Claim 2, a tension-proof function can be improved further, and the said effect of invention of Claim 1 is promoted.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an optical fiber cable according to an embodiment of the present invention.
FIG. 2 is a longitudinal front view of the optical fiber cable of the embodiment.
FIG. 3 is a longitudinal front view of a conventional optical fiber cable.
[Explanation of symbols]
2 Optical fiber line 3 Inner resin coating layer 4 High tensile fiber layer 5 External resin coating layer 6 High tensile fiber layer

Claims (2)

A plurality of optical fiber cords formed by covering a single optical fiber core with a vinyl sheath, and covering the plurality of optical fiber cords with an internal resin coating layer, and covering the resin coating layer with a high-tensile fiber layer, and the outside Is covered with an external resin coating layer ,
The optical fiber cable is characterized in that the plurality of optical fiber cords are twisted together and a high-tensile fiber layer is provided at the center of the plurality of optical fiber cords . The outer resin coating layer is made of polyurethane,
The optical fiber cable according to claim 1.

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