JP2006195109A - Tape drop cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tape drop cable that can prevent optical fibers from being damaged due to a stab, without winding a protective tube or the like around the cable. <P>SOLUTION: The tape drop cable has coated optical fiber cable cores 1 covered with a cable jacket 3, wherein a protective wall 50 is formed inside the cable jacket 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tape drop cable. More specifically, the present invention relates to a tape drop cable that prevents optical fibers from being damaged due to stabs by preventing entry of those that cause stabs.

JP 2002-90596 A

  The drop cable is configured such that the optical fiber cable core and the tension member are arranged so as to be included in the same plane and are covered with a jacket.

  When a tape drop cable is used in an aerial environment, the cable jacket is often damaged by stabs, and the optical fiber cable core is frequently damaged. There are various causes of puncture, but one of the main causes is that the cicada pierces the oviduct into the drop cable. That is, in order for the cicada to lay eggs, the egg-laying tube is pierced into the drop cable and the optical fiber inside is damaged. When the optical fiber is stabbed, stress concentrates on the stabbed portion due to stress over time, and the optical fiber breaks and breaks down.

  The tape drop cable is provided with a “notch” for facilitating removal of the optical fiber cable core (Patent Document 1). However, since the outer cover of the notch portion has a small thickness, the drop cable having the notch is particularly troubled.

  In Patent Document 1, the notch opening is closed with a peelable material so as to be completely closed on the surface of the outer skin, so that the cicada is not aware of the presence of the notch so that it does not lay eggs near the optical fiber cable core. ing.

  However, the notch part of the tape drop cable is used to easily take out the optical fiber cable core. If the notch part is eliminated and the thickness is the same as that of the jacket, the optical fiber inside the multi-fiber tape drop cable is used. Since the cable core is a tape core, the surface area is large, and when the cable core is stabbed into a semi-vibrated oviduct, the possibility of damaging the optical fiber cable becomes high. Further, a dedicated tool or the like for taking out the optical fiber cable core wire is required.

  Therefore, as a countermeasure against these problems, a protective tube or the like is wound around the drop cable so that the spawning tube does not reach the optical fiber even if it is stabbed in the semicircular spawning tube.

  However, the above-mentioned “Method of wrapping protective tube etc. around drop cable” is effective for the part where the protective tube is wrapped, but it is difficult to specify the place where the protective tube etc. is wrapped. We are struggling with the operation and cost for winding.

  An object of this invention is to provide the tape drop cable which can prevent the damage of the optical fiber by a stab without wrapping a protection tube etc.

The invention according to claim 1 is a tape drop cable formed by coating an optical fiber cable core with a cable jacket,
The tape drop cable is characterized in that a protective wall is provided inside the cable jacket.

The invention according to claim 2 is a tape drop cable formed by coating an optical fiber cable core with a cable jacket,
A tape drop cable having a shape in which a solid protective wall is attached to an outer layer of the cable jacket.

  The invention according to claim 3 is the tape drop cable according to claim 1 or 2, wherein the protective wall is made of plastic or metal.

The invention according to claim 4 is the tape drop cable according to any one of claims 1 to 3, wherein the protective wall has a Mohs hardness of "3" or more.
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(Claim 1)
In the invention according to claim 1, a protective wall is provided inside the cable jacket. The protective wall has a function of preventing penetration of a stinging cause part (for example, a semi-vibrated oviduct). Accordingly, the caliper is allowed to enter the cable jacket, but the protective wall prevents damage to the optical fiber cable core.
The protective wall can be easily removed with existing tools, etc., so the workability at the time of cable crossing is the same as the existing drop cable, and special work such as winding a protective tube for semi-measures Is not necessary.

(Claim 2)
In the invention which concerns on Claim 2, a protective wall is provided in a cable jacket as an outer layer.
A cable jacket provided with a protective wall as an outer layer cannot pierce the drop jacket with a semi-vibrating tube, and also has a function of preventing damage to the drop jacket from contact / rubbing with adjacent objects.
The protective wall may be attached to the cable jacket using, for example, an adhesive. In that case, it is preferable to set it as the adhesive force which can be isolate | separated without using an exclusive tool etc.

(Claims 3 and 4)
The protective wall is preferably made of plastic or metal. In addition, since the semi-vibrated oviduct has a Mohs hardness of “3”, a protective wall with a hardness higher than this is particularly effective.

  According to the present invention, in an area where there is a possibility of occurrence of semi-harm, it can be constructed in the same manner as the existing cable crossing method, and the cable is removed from biological damage that may cause trauma to the cable including semi-harm. I can protect it. For this reason, it is possible to expect a reduction in operation and cost, such as the “method of wrapping a protective tube etc. around a drop cable”, which has been carried out in a separate process, and a reduction in the number of failures due to semi-harm. Moreover, there is no need to limit the semi-damaged area, and the drop cable can be negotiated in all areas by the same construction method.

FIG. 1 shows this example. In this example, in the tape drop cable formed by coating the optical fiber cable core wire 1 with the cable jacket 3, the protective wall 50 is provided inside the cable jacket 3.
This will be described in more detail below.

This is an example of a drop cable provided with a protective wall 50 as an inner layer of the cable jacket 3. The protective wall 50 also has a tension member function for absorbing the cable pulling force, and also has a protection against stings (especially cicada oviposition tubes). Even if the egg laying tube is stabbed from above the cable jacket 3, the egg laying tube cannot enter further, and the fiber optic cable core wire 1 is not reached.
In this example, plastic or metal is used as the protective wall.

FIG. 2 shows an example of a drop cable provided with a protective wall 50 as an inner layer of the cable jacket 3. The protective wall 50 is arranged on the side surface of the optical fiber cable core 1 and is arranged so that the egg-laying tube does not reach the optical fiber cable core wire 1 even when stabbed into the egg-laying tube from above the cable jacket 3 as in the first embodiment. It has become.
In this example, the tension member 2 is provided separately from the protective wall 50. Other points are the same as in the first embodiment.

  FIG. 3 shows an example of a drop cable provided with a protective wall as an inner layer of the cable jacket 3. The protective wall 50 is arranged in a shape covering the entire circumference of the optical fiber cable core 1, and is arranged so that the egg-laying tube does not reach the core wire even if it is stabbed into the egg-laying tube from the cable jacket 3. Other points are the same as in the second embodiment.

  FIG. 4 shows an example of a drop cable provided with a protective wall 50 as an outer layer of the cable jacket 3. The protective wall 50 is bonded to the cable jacket 3 and has an adhesive force that can be separated without using a dedicated tool or the like. Also in this example, even if the egg laying tube is stabbed from above the cable jacket, the egg laying tube does not reach the core wire.

  FIG. 5 shows an example of a drop cable in which a protective wall is provided on the cable jacket outer layer. The protective wall is covered by the cable jacket and is not glued. Moreover, it is possible to remove a protective wall by turning the cable jacket of the part which has covered the protective wall. Even if the egg laying tube is stabbed from the cable jacket, the egg laying tube does not reach the core wire.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective sectional view showing a structural example of a protective wall interior (also used as a tension member) type tape drop cable according to Example 1; It is a perspective sectional view showing an example of structure of a protection wall interior type tape drop cable concerning Example 2. FIG. FIG. 10 is a perspective cross-sectional view showing a structural example of a protective wall interior (fiber packing) type tape drop cable according to Example 3; FIG. 10 is a perspective sectional view showing a structural example of a protective wall exterior (adhesion) type tape drop cable according to Example 4; FIG. 10 is a perspective cross-sectional view showing a structural example of a protective wall exterior (cover fixing) type tape drop cable according to the fifth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical fiber cable core wire 2 Tension member 3 Cable jacket 4a, 4b Notch 20 Support line 50 Protective wall

Claims (4)

In a tape drop cable in which an optical fiber cable core is covered with a cable jacket,
A tape drop cable, wherein a protective wall is provided inside the cable jacket. In a tape drop cable in which an optical fiber cable core is covered with a cable jacket,
A tape drop cable having a shape in which a solid protective wall is attached to an outer layer of the cable jacket. The tape drop cable according to claim 1 or 2, wherein the protective wall is made of plastic or metal. The tape drop cable according to any one of claims 1 to 3, wherein the protective wall has a Mohs hardness of "3" or more.

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