JPH052887Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a short optical fiber cable used for information transmission between devices indoors.

[Prior art] In recent years, there has been an increase in factory automation and office automation, which uses computers to efficiently perform various controls and measurements in factories, and office processing in offices. Development of home automation, in which electrical appliances in the home are controlled by computers, is actively being developed, but as the number of terminal devices increases, optical data transmission between computers or between center equipment and each terminal device is becoming increasingly difficult. There is a trend towards using fiber cables.

A cross-sectional view of an example of a conventional optical fiber cable is shown below.
It is shown in Figure 4. This optical fiber cable is made by twisting a plurality of optical fiber thin wires (core wires) 11 around a wire rod 21, and forming a plurality of fiber units 20 each having a fiber jacket 23 fitted around the optical fiber thin wires 11 as a tension member. Organic fibers 12 such as polypropylene yarns are arranged lengthwise around the entire fiber unit 20, wrapped with a tape 13, and covered with a polyethylene sheath 14 (for example, Showa 59-
(See No. 1189).

[Problems to be solved by the invention] In such optical fiber cables, the number of thin optical fibers (core wires) is limited;
There was a problem in that the amount of data transmitted was insufficient, and when the amount of data was increased, the diameter became larger, making it difficult to flexibly install indoor wiring.

Furthermore, as a fiber cable for long-distance communication, a structure in which glass fiber is arranged around the outer periphery of a thin optical fiber wire is known (see Utility Model Application Publication No. 51-63739), but if this is used as a cable between devices indoors, However, when bent, the repulsion force is strong, the impact effect against external forces is small, and the weight is large, making it impossible to use as an inter-device cable.

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and aims to improve flexibility by increasing the number of fiber cores compared to the diameter thereof. The purpose is to provide an optical fiber cable that makes it possible to increase the space factor.

In the present invention, a large number of optical fibers is a collection of a plurality of units in which a large number of organic fibers are mixed along the optical fibers in an appropriate ratio, and at least an organic fiber layer is formed on the outside. It is characterized by becoming.

[Examples] The present invention will be described below based on drawings showing examples thereof. FIG. 1 is a schematic cross-sectional view of an optical fiber cable according to the present invention. In the figure 11
(Represented by a circle) is an ultraviolet curing resin,
Optical fiber core wire coated with nylon resin, ETFE (fluorocarbon resin), etc., 12 (represented by an x mark) is made of suitable elastic material such as aramid fiber, polypropylene yarn, etc. with a diameter of 5 to 50 μm. They are organic fibers with tensile strength, and there are approximately several hundred of each. Optical fiber core wire 11, organic fiber 1
For example, the remote distance (distance between fibers) of each optical fiber core wire 11 is set to approximately
0.2 mm, and organic fibers 12 of 0.3 to 0.2 mm are mixed on the outside (outermost layer) of the mixture to reduce the cable diameter in consideration of the buffering effect.
The thickness is about 5 mm, preferably 0.5 to 2 mm. Outer organic fiber 12
is wrapped with a tape 13 made of a material such as polyethylene, nonwoven fabric, or polyester.
Further, the tape 13 is provided with a polyethylene jacket 14.

In the embodiment, about 10 optical fiber core wires 11 and organic fibers 12 are made into one unit, several dozen units are twisted together, and a jacket 14 is applied by pressing and wrapping the unit with a tape 13. In this embodiment, since each unit can be easily separated, branching becomes easy, and since the number of fibers in one unit is small, it is easy to identify which optical fibers should be opposed when joining optical fiber cables. As shown in FIG. 2, in each unit, optical fiber cores 11 and organic fibers 12 are mixed so that each optical fiber core wire 11 has an appropriate interval, and a layer of organic fibers 12 is provided on the outside. The thickness may be the same as that of the previous embodiment), or the structure may be such that all the optical fiber cores 11 are arranged at the center and the organic fibers 12 are arranged around it, as shown in FIG.

An optical fiber cable having such a configuration is used, for example, by being wired indoors or the like to transmit information between a plurality of terminal devices and a host computer, and each end thereof is connected to each terminal device.

[Effects] According to the present invention, the space factor of the optical fiber core increases significantly, and therefore, when the optical fiber cable has the same diameter as the conventional optical fiber cable, the tension member 22 as shown in FIG. In addition, there is no need for the fiber unit 20 having the wire 21, and the number of optical fiber cores can be greatly increased, and the diameter of the cable can be reduced if the number of optical fiber cores is the same. Therefore, even when the amount of data transmission increases due to an increase in the number of terminal devices, etc., less space is required for wiring, and the aesthetic appearance is not impaired. In addition, although the present invention does not have a tension member, there is no problem in indoor wiring, etc., since the tensile force can be withstood by the cushioning material. This invention is superior in that it has excellent flexibility and increases the degree of freedom in wiring, and since the organic fiber acts as a buffer material, it has excellent impact resistance and there is no risk of breakage even when twisted. It has a great effect.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an optical fiber cable according to the present invention, FIGS. 2 and 3 are sectional views of an optical fiber unit, and FIG. 4 is a sectional view of a conventional optical fiber cable. 11...Optical fiber core wire, 12...Organic fiber,
13...tape, 14...outer cover.

Claims (1)

[Scope of utility model registration request] It is characterized by being made up of a plurality of units in which a large number of optical fiber cores and a large number of organic fibers arranged along the optical fiber cores are mixed in an appropriate ratio, and at least an organic fiber layer is formed on the outside. optical fiber cable.