JP2007257975A - Complex cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a complex cable capable of effectively securing extra length of a fiber-optic cable and contributing to its downsizing. <P>SOLUTION: The complex cable 1 has fiber-optic cables 3 and wires 2 bundled with a coating part 4. A twisted wire part 6 consisting of a plurality of twisted wires are arranged at a center part. A plurality of fiber-optic cables 3 are arranged around the twisted wire part 6, themselves in a twisted state around the twisted wire part 6. An interval retaining member 7 is intercalated between the twisted wire part 6 and each fiber-optic cable 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a composite cable configured by bundling an optical fiber cable and an electric wire.

  In recent years, communication networks between devices mounted in automobiles have been promoted, and along with this, the number of cables laid in automobiles has increased. In order to cope with reduction of noise generated from these cables and high-speed communication, optical fiber cables are being used instead of electric wires in some cables. Under such circumstances, composite cables configured by bundling optical fiber cables and electric wires are also being used.

  In addition, in a composite cable as a high-speed optical communication component in which an optical fiber cable and an electric wire, so-called copper wire, are combined, the physical strength of each other is different. The damage tends to be biased. In particular, when a tensile load is applied to a composite cable of a 125-micron diameter optical fiber cable and an electric wire, there is a possibility that the optical fiber cable is excessively loaded and torn off.

  Therefore, in order to prevent such damage, the length of the composite cable has a structure with more space on the optical fiber cable side than the length on the electric wire side, and the composite cable is subjected to a tensile load. There has been proposed a structure in which tension is applied intensively to the electric wire side when it acts, and the electric wire functions as a tension member.

  For example, as a structure for giving a space to the length of such an optical fiber cable, the electric wires are arranged along the length direction of the composite cable, and the optical fiber cable is arranged in the length direction in the tube body having a sufficient inner diameter. There is a structure in which a space is provided with a margin.

  However, according to the structure using the tube body having a sufficient inner diameter with respect to the outer diameter of the optical fiber cable, when the electric wire is extended by a tensile load and exceeds the extra length that can be accommodated in the tube body of the optical fiber cable, that is, the light If the length of the fiber cable is the same as the built-in length, the optical fiber cable may be broken due to tension.

  The extra length of the optical fiber cable having such a structure depends on the diameter of the tube body, and in order to avoid this problem, a method for increasing the extra length of the optical fiber cable by increasing the inner diameter of the tube body. However, there is a drawback that the outer diameter of the composite cable as a whole becomes thick.

  In view of the above problems, an object of the present invention is to provide a composite cable that can effectively ensure the extra length of an optical fiber cable and contribute to compactness.

  The technical means for solving the above problems is a composite cable in which an optical fiber cable and an electric wire are bundled at a covering portion, and a twisted electric wire portion made up of a plurality of electric wires twisted together is disposed in the center portion, A plurality of optical fiber cables are arranged around the twisted electric wire portion, and the optical fiber cables are arranged in a twisted state around the twisted electric wire portion.

  Moreover, it is good also as a structure where the space | interval holding member is interposed between the said twist electric wire part and each said optical fiber cable.

  As described above, according to the composite cable of the present invention, the twisted electric wire portion composed of a plurality of electric wires twisted together is arranged in the center portion, and a plurality of optical fiber cables are arranged around the twisted electric wire portion. In addition, the optical fiber cables are arranged in a twisted state around the twisted electric wire part, and the twisted structure is formed around the twisted electric wire part longer than the twisted electric wire part formed in the central part. The optical fiber cable can effectively secure a longer extra length, so even if a tensile load is applied to the composite cable, the tension is concentrated on the twisted electric wire section arranged in the center, and The action of large tension can be effectively prevented.

  Moreover, it is a simple structure in which the optical fiber cable is arranged in a twisted state around the twisted electric wire portion, and there is an advantage that it can be configured compactly.

  Furthermore, since the optical fiber cable is made of quartz glass or the like, the strands of the optical fiber cable tend to be easily unraveled even when trying to have a twisted structure. However, the twisted electric wire portion having the twisted structure maintains its twisted shape, There is also an advantage that the twisted shape of the optical fiber cable having a so-called twisted structure around it can be effectively maintained.

  Further, if the structure is such that a spacing member is interposed between the twisted electric wire portion and each of the optical fiber cables, it is possible to effectively prevent interference between the electric wires and the optical fiber cables. In addition, there is an advantage that the extra length of the optical fiber cable can be easily adjusted by adjusting the thickness of the spacing member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are a cross-sectional view and a perspective view of a composite cable 1 as an example of a high-speed optical communication component used in an in-vehicle optical communication system or the like. It is set as the structure which bundled the several electric wire 2 and the several optical fiber cable 3 with the coating | coated part 4. FIG.

  In the present embodiment, the two electric wires 2 are twisted together at an appropriate twist pitch to form the twisted electric wire portion 6 and are arranged in the central portion of the composite cable 1. Two optical fiber cables 3 are arranged around the twisted electric wire portion 6 at substantially equal intervals, and each optical fiber cable 3 is arranged in a spiral shape along the twist of the twisted electric wire portion 6. ing. Here, each optical fiber cable 3 has a structure in which the optical fiber cables 3 are arranged in a twisted state around the twisted wire portion 6.

  At this time, the outer periphery of the twisted electric wire portion 6 positioned between the twisted electric wire portion 6 and each optical fiber cable 3 is extruded with a resin such as polyethylene, or wrapped with a rubber pipe, a nonwoven fabric, a tape, or the like. The spacing holding member 7 is attached in a so-called circular cylinder shape, and the spacing between the optical fiber cable 3 and the twisted electric wire portion 6 is held at a predetermined level by the spacing holding member 7.

  Each electric wire 2 has a structure in which the outer periphery of a linear conductor portion 2a formed of copper, copper alloy, or the like is covered with a covering portion 2b made of resin or the like. Each optical fiber cable 3 has a structure in which the outer periphery of the optical fiber main body 3a is covered with a covering portion 3b made of resin or the like.

  Each optical fiber body 3a is formed of a resin such as quartz glass or plastic, and has a structure in which, for example, the outer periphery of a core part (not shown) is covered with a cladding part (not shown). Moreover, the coating | coated part 3b is formed with well-known coating | covering materials, such as a polyethylene type, a polypropylene type, or a polyamide type, for example.

  Further, the covering portion 4 of the outer layer is also formed of a well-known covering material such as polyethylene, as described above.

  The composite cable 1 of the present embodiment is configured as described above. Usually, since the optical fiber cable 3 is made of quartz glass or the like, the optical fiber cable 3 tends to be easily unwound even if it is made to have a twisted structure. The twisted wire portion 6 arranged in a twisted structure has a twisted shape so that the twisted structure of the twisted wire portion 6 becomes a resistance, and an optical fiber having a so-called twisted structure around it. There is an advantage that the twisted shape of the cable 3 can also be effectively maintained.

  In addition, the optical fiber cables 3 having a twisted structure around the twisted wire part 6 having a twisted structure at the center can secure a longer installation distance than the extra length of the wires 2. Since an extra length longer than that of the electric wire 2 can be effectively secured and a tensile load acts on the composite cable 1, tension acts on the twisted electric wire portion 6 disposed in the center portion, so that the optical fiber cable 3 It is possible to effectively prevent the action of a large tension on the.

  Furthermore, it is a simple structure in which the optical fiber cable 3 is arranged in a twisted state around the twisted electric wire portion 6, and there is an advantage that it can be configured more compactly than a structure using a tube body as described above.

  Moreover, since it is set as the structure where the space | interval holding member 7 is interposed between the twist electric wire part 6 and each optical fiber cable 3, between each electric wire 2 and each optical fiber cable 3 is used. There is an advantage that interference can be effectively prevented and the extra length of the optical fiber cable 3 can be easily adjusted by adjusting the thickness of the spacing member 7.

  In addition, when the terminal processing of the electric wire 2 or the optical fiber cable 3 is performed, it is preferable that the electric wire 2 is wired as short as possible, and a fixing structure that is loose in the length direction is employed for the terminal processing of the optical fiber cable 3.

  Even if it is necessary to rework the end of the optical fiber cable 3 for some reason, the entire length of the optical fiber cable 3 is given, so that the optical fiber cable 3 itself can be pulled out and processed easily. Can do.

  In addition, in the said embodiment, although it is set as the twisted electric wire part 6 which twisted together the two electric wires 2, the structure which twisted the three or more electric wires 2 may be sufficient, and it is not limited at all.

  Moreover, although the optical fiber cable 3 has shown the structure where two are arrange | positioned, three or more may be sufficient.

  Furthermore, in the embodiment, each optical fiber cable 3 is arranged in a twisted state along the twist of the twisted wire portion 6, but the twist pitch is shorter than the twist pitch of the wire 2 in the twisted wire portion 6. It is good also as a structure by which the optical fiber cable 3 is twisted together. In this case, there is an advantage that a longer extra length can be secured on the optical fiber cable 3 side.

It is sectional drawing of the composite cable concerning embodiment of this invention. It is the same part perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Composite cable 2 Electric wire 3 Optical fiber cable 4 Covering part 6 Twist electric wire part 7 Spacing holding member

Claims (2)

In a composite cable in which an optical fiber cable and an electric wire are bundled at a covering portion,
A twisted electric wire portion composed of a plurality of electric wires twisted together is arranged at the center, a plurality of optical fiber cables are arranged around the twisted electric wire portion, and the optical fiber cables are arranged around the twisted electric wire portion. A composite cable characterized by being arranged in a twisted state. The composite cable according to claim 1,
A composite cable, wherein a spacing member is interposed between the twisted electric wire portion and each of the optical fiber cables.

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