JPS628111A - Plane type optical cable - Google Patents

Abstract

PURPOSE:To improve the efficiency of connecting operation and to reduce the cost of a plane optical fiber and improve the reliability by arranging a synthetic fiber member which has a small tensile elongation percentage around an optical fiber core and making a cut which can be torn longitudinally at corresponding positions of the top and reverse surfaces of a jacket between an optical fiber core and a steel wire. CONSTITUTION:Two optical fiber cores 5 which have a synthetic fiber member 9 of an aromatic polyamide fiber, etc., with a small tensile elongation percentage at outer peripheries are arranged in parallel at a specific interval and steel wires 6 which protect the optical fiber cores 5 against pressing force (load) are arranged on both sides in parallel. In this state, they are coated with the jacket 7 made of synthetic resin, e.g. vinyl chloride to an about 2mm thickness. Then, a cut 10 which can be torn longitudinally is formed at corresponding positions of the top and reverse surfaces of the jacket 7 between the optical cores 5 and steel wires 6. This plane optical fiber 1 is torn along the cut 10 to divide the two center optical fiber cores 5 like single-core optical cords 3'.

Description

[Detailed Description of the Invention] [Summary] A flat optical cable that is laid under carpets in offices, etc., in which a plurality of optical fiber core wires and a plurality of steel wires are arranged in parallel and surrounded by an insulating material. The optical fiber core wire and the steel wire are coated with a jacket made of the same material, and vertically tearable notches are provided at corresponding positions on the upper and lower surfaces of the jacket between the optical fiber core wire and the steel wire, so that the fiber can be easily divided.

[Industrial application field]

The present invention relates to a flat optical cable, in particular, a synthetic fiber member with a low tensile elongation rate and a steel wire that protects the optical fiber from pressing force are arranged around the optical fiber core wire, and a notch that can be vertically split is provided. Regarding flat optical cables.

It is well known that in recent years, communication devices are moving toward optical communication using optical fibers that are not affected by induced noise from the outside and can carry multiple lines of communication simultaneously. However, optical communication equipment is generally installed indoors, and the indoor wiring is laid under the carpet.
By placing multiple optical fiber core wires and multiple steel wires in parallel,
It is coated with an insulating material such as synthetic fiber, and it is difficult to separate it into single-core cords, so a multi-connector is required to connect it to the device, which is weak against tension and pressure, and can be damaged if wired under carpet. Therefore, there is a strong demand for the development of flat optical cables that can withstand tensile and pressing forces and are easy to split.

[Conventional technology]

Figure 3 is a schematic cross-sectional view of a conventional flat optical cable.
al is a structure in which two optical fibers and two steel wires are closely connected in parallel, (b) is a structure in which two optical fibers and one steel wire are separated and arranged in parallel, and (C) is a structure in which two optical fibers and a steel wire are arranged in parallel. It has a structure in which two wires are separated and placed in parallel.

FIG. 3(a) shows two optical fiber core wires 5 and two steel wires 6, with the optical fiber core wire 5 closely attached to the center and the steel wires 6 closely attached in parallel on both sides. , and is coated and molded with a jacket 7 made of synthetic resin, such as vinyl chloride.

FIG. 3(b) shows two optical fiber coated wires 5, one steel wire 6, and the optical fiber coated wires 5 are arranged in parallel at both ends with a slight distance between them with Ii#IA6 in the center. They are lined up and molded to be covered with a jacket 7 made of synthetic resin, such as vinyl chloride.

FIG. 3(C) shows two optical fiber coated wires 5 and two steel wires 6 arranged in parallel with the optical fiber coated wire 5 at a slight interval in the center, and the steel wires on both sides. 6 are lined up in parallel at a slight interval and are covered and molded with a jacket 7 made of synthetic resin, such as vinyl chloride.

FIG. 4 is a perspective view illustrating an example of mounting a conventional flat optical cable, in which the same parts as in FIG. 3 are given the same reference numerals.

The figure shows that when connecting the flat optical cable 1 explained in FIG. A multi-connector 2' is connected to the other end of a plurality of single-fiber optical cords 3 each having a single-fiber connector 4 attached to one end, and the multi-connector 2' is connected to a flat optical cable 1.
After connecting to the multi-connector 2 attached to the end of
This is a structure for connecting a single-core connector 4 to an optical transmission device 8.

[Problem that the invention seeks to solve]

The conventional flat optical cable described above requires a pair of multi-connectors to connect the flat optical cable to a device, which requires a lot of man-hours and is expensive.
There was a problem that the wires were weak against tension and pressure and could be damaged if placed under the carpet.

[Means for solving problems]

The present invention solves the above problems and provides a strong flat optical cable that is easy to connect.

That is, a plurality of optical fiber core wires 5 and a plurality of steel wires 6
A flat optical cable 1 is arranged in parallel at a predetermined interval, and a jacket 7 is applied around the periphery.A synthetic fiber member 9 with a small tensile elongation rate is arranged around the optical fiber core 5, and the optical fiber core is This problem is solved by providing longitudinally tearable cuts 10 at corresponding positions on the upper and lower surfaces of the jacket 7 between the steel wires 5 and 6.

[Effect]

The above-mentioned flat cable has a synthetic fiber member 9 with a small tensile elongation rate arranged around the optical fiber core wire to protect against tension, and is arranged in parallel on both sides of the optical fiber to prevent damage to the optical fiber due to pressing force. Furthermore, vertically tearable notches are provided at corresponding positions on the upper and lower surfaces of the jacket between the optical fiber core wire and the steel wire, thereby facilitating the connection work without requiring a multi-connector.

〔Example〕

FIG. 1 is a diagram illustrating an embodiment of the present invention.
) is a front view of the flat cable, crest) is a perspective view of the flat cable torn apart, and (C) is a perspective view of the optical fiber core, in which the same parts as in FIG. 3 are given the same reference numerals.

FIG. 1(a) shows two optical fiber cores 5 in which a synthetic fiber member 9 such as an aromatic polyamide fiber (trade name: Kevlar) with a small tensile elongation rate is arranged around the outer periphery of the optical fiber core 5.
are arranged in parallel at a predetermined interval in the center, and steel wires 6 are arranged in parallel at a predetermined interval on both sides to protect the optical fiber core 5 from damage due to pressing force (load). in,
It is coated with a jacket 7 made of synthetic resin, such as vinyl chloride, and has a thickness of about 2+wm. Cuts 10 for vertical tearing are provided at corresponding positions on the upper and lower surfaces of the jacket 7 between the optical fiber core 5 and the steel wire 6.

1), if the flat optical cable 1 explained in FIG. 1(a) is torn along the notch 10, the two central optical fibers 5 will be separated as a single-core optical cord 3'. be divided.

FIG. 1(C) is a block diagram of the optical fiber core 5, in which the optical fiber 51 is coated with a primary coat 52 as a buffer layer, and a secondary coat 53 is applied on the primary coat 52. Its outer diameter is approximately 0.9 asφ.

FIG. 2 is a plan view illustrating the present invention in detail, in which the same parts as in FIG. 1 are given the same reference numerals.

In the figure, when the flat optical cable 1 is torn along the notch 10, the two central optical fiber cores 5 are divided into single-fiber optical cord-like 3', and each single-fiber optical fiber 3' is divided into single-fiber optical fibers 3'. A core connector 4 may be attached to connect it to an optical transmission device (not shown); in this case, the steel wire 6 portion may be cut as necessary.

Although the present embodiment has been described with reference to two optical fibers 5, the number is not limited to two, and two or more or more optical fibers may be used.

〔Effect of the invention〕

As is clear from the above explanation, the present invention does not require multiple connectors for connection to devices, so it is possible to improve connection work efficiency and reduce costs, which is extremely effective in improving reliability. It is.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention.
) is a front view of the flat cable, crest) is a perspective view of the flat cable torn apart, (C) is a perspective view of the optical fiber core, FIG. 2 is a plan view explaining the present invention in detail, and FIG. 3 is a perspective view of the flat cable. ,
Schematic cross-sectional views of conventional flat optical cables. (a) shows a structure in which two optical fibers and two steel wires are closely connected in parallel, and (b) shows a structure in which two optical fibers and one steel wire are separated and arranged in parallel. structure,(
C) is a structure in which two optical fibers and two steel wires are separated and arranged in parallel, and FIG. 4 is a perspective view illustrating an example of mounting a conventional flat optical cable. In the figure, l is a flat optical cable, 2.2' is a multi-connector, 3 is a single-fiber optical cord, 3' is similar to a single-fiber optical cord, 4 is a single-fiber connector, 5 is an optical fiber core wire, 6 is a steel wire,
7 is an outer cover, 8 is an optical transmission device, 9 is a synthetic fiber member, 10 is a cut, 51 is an optical fiber, 52 is a primary coat, and 53 is a secondary coat. town! lff1 (b) tC) 1st m

Claims (1)

[Claims] A flat optical cable (1) in which a plurality of optical fiber core wires (5) and a plurality of steel wires (6) are arranged in parallel at a predetermined interval and a jacket (7) is provided around the circumference. A synthetic fiber member (9) having a small tensile elongation rate is disposed around the optical fiber core (5), and a synthetic fiber member (9) having a small tensile elongation rate is provided on the outer sheath between the optical fiber core (5) and the steel wire (6). A flat optical cable characterized by having vertically tearable notches (10) at corresponding positions on the lower surface.