JP6515751B2 - Fiber optic cable - Google Patents

Description

  The present invention relates to an optical fiber cable, and more particularly to an optical fiber cable in which a plurality of optical fiber cores are covered with a cable jacket.

  In addition to the speeding up of communication and the increase in the amount of information due to the spread of information communication such as the Internet, construction of an optical network is progressing to cope with bidirectional communication and large capacity communication. In this optical network, FTTH (Fiber To The Home) has been started, which provides high-speed communication services by directly connecting a telecommunications carrier and each home with an optical fiber. Therefore, the demand for wiring work for disassembling the optical fiber cable and distributing it to a plurality of terminals is increasing.

  By the way, when the optical fiber core is buried in the cable sheath, it is difficult to take out the optical fiber core at the time of disassembling the above-mentioned optical fiber cable. Therefore, for example, Patent Document 1 discloses a technique in which an inclusion is disposed between the cable sheath and the optical fiber core wire so that the optical fiber core wire does not stick to the cable sheath. . Further, Patent Document 2 further discloses a technique in which an optical fiber core wire is sandwiched by an intervening tape so that the optical fiber core wire is unlikely to be buried in the cable sheath.

JP, 2006-251770, A JP, 2014-137480, A

  However, in the technique of Patent Document 1, since the optical fiber core partially adheres to the cable sheath, the pressure from the cable sheath during extrusion tends to damage the optical fiber core, and The surface of the fiber core not in contact with the inclusions contacts the cable sheath, so the optical fiber core may be buried in the cable sheath. According to the technology of Patent Document 2, although the cable sheath and the optical fiber core wire are not in contact with each other, the special tool can be disassembled without any problem, but with general tools such as oblique blade nippers, avoid the intervening tape There is a problem that it is difficult to disassemble the optical fiber cable because the cable jacket has to be cut. In addition, when disassembly is attempted with a general tool, there is a problem that when the general tool touches the intervening tape, the optical fiber core wire inside is pushed and the optical fiber core wire is easily damaged.

  The present invention has been made in view of the above situation, and provides an optical fiber cable which can be easily disassembled by a general tool such as a bevel blade nipper without damaging the optical fiber core. With the goal.

  The optical fiber cable according to one aspect of the present invention is orthogonal to the direction in which the two tension members are connected together with at least one tape core, two tension members disposed on both sides of the tape core, and Two intervening tapes disposed across the tape core in a direction, and two intervening cords disposed between the tension member and the tape core and in contact with the ends of the intervening tape, respectively A cable jacket formed by collectively covering the two tension members, the two intervening tapes, and the two intervening strings, and a cable jacket formed on the surface and orthogonal to a direction connecting the two tension members An optical fiber cable provided with two pairs of notches formed by sandwiching the intervening string in the direction to move, wherein the intervening string is directed to the adjacent tension member in front of the intervening tape. The tape core wire, the tension member, and the intervening tape are present on a line having a protrusion projecting from an end and connecting the tip of the notch in a direction orthogonal to the direction connecting the two tension members. Instead, only the cable jacket and the projection are provided.

  According to the above, it is possible to easily disassemble the optical fiber cable by cutting the cable jacket and the intervening cord with a general tool such as an oblique blade nipper without damaging the optical fiber core.

It is a figure which shows an example of the optical fiber cable by 1st Embodiment of this invention. It is a figure which shows an example of the structure of an intermittent tape core. It is explanatory drawing when taking out an optical fiber core line from the optical fiber cable of 1st Embodiment, and is a figure which cut | disconnects a cable in the cable longitudinal direction with a bevel blade nipper. It is explanatory drawing when taking out an optical fiber core line from the optical fiber cable of 1st Embodiment, and is a figure which cut | disconnects a cable in the direction orthogonal to a cable longitudinal direction with a bevel blade nipper. (A) is a figure explaining the cutting | disconnection state of FIG. 3, (B) is a figure explaining the cutting state of FIG. 4, (C) is a figure explaining the state before taking out an optical fiber core wire. It is a figure which shows an example of the optical fiber cable by 2nd Embodiment. It is a figure which shows an example of the optical fiber cable by 3rd Embodiment.

Description of the embodiment of the present invention
First, the contents of the embodiment of the present invention will be listed and described.
An optical fiber cable according to one aspect of the present invention comprises: (1) a direction in which at least one tape core wire, two tension members disposed on both sides of the tape core wire, and the two tension members are connected Between the two intervening tapes disposed across the tape core in a direction orthogonal to the two, and between the tension member and the tape core and in contact with the end of the intervening tape Intervening cords, a cable jacket obtained by collectively covering the two tension members, the two intervening tapes, and the two intervening cords, and the cable jacket surface are formed to connect the two tension members. An optical fiber cable comprising two pairs of notches formed across the intervening cord in a direction orthogonal to the direction, the intervening cord being directed toward the adjacent tension member The tape core wire, the tension member, and the intervening tape on a line connecting the tips of the notches in a direction orthogonal to the direction connecting the two tension members. There is no, and only the cable jacket and the projection are provided. As described above, only the cable jacket and the protruding portion of the intervening cord are provided on the line connecting the ends of the notches, not the intervening tape. The cable jacket and the intervening cord can be cut with a general tool, and the fiber optic cable can be easily disassembled.

(2) In the direction orthogonal to the direction connecting the two tension members, the width of the cable jacket at the position where the tape core is arranged is the width of the cable jacket where the tape core is not arranged Greater than. Since a step is formed at the boundary of the notch, when disassembling the optical fiber cable along its longitudinal direction with a general tool such as an oblique blade nipper, the cutting edge of the oblique blade nipper can be easily slid along the notch, It is possible to quickly pull away the cable jacket at a place where the tape core wire is not disposed.
(3) An internal space where the cable jacket is not filled is formed between the tape core wire and the intervening cord. Since the bending force due to the pressure from the cable jacket does not act directly on the ribbon, it is possible to prevent the damage to the optical fiber by the pressure from the cable jacket.
(4) A water absorbing agent is applied to the intervening cord. When the intervening cords function as a water absorbing layer, when the water infiltrates, it is possible to shut off the tape core.

Details of the Embodiment of the Present Invention
Hereinafter, preferred embodiments of the optical fiber cable according to the present invention will be described with reference to the attached drawings.
FIG. 1 is a view showing an example of an optical fiber cable according to a first embodiment of the present invention. Moreover, FIG. 2 is a figure which shows an example of the structure of an intermittent tape core. In addition, although the following optical fiber cable 1 demonstrates the structure which is not equipped with a supporting wire, it may be a structure of a self-supporting type provided with a supporting wire.

  As shown in FIG. 1, the optical fiber cable 1 has a cable jacket 30 in which, for example, two tension members 22, two intervening tapes 24, and two intervening cords 26 are collectively covered. The cable jacket 30 is formed of a thermoplastic resin such as an olefin resin (for example, low density polyethylene etc.) and, for example, the four intermittent tape cores 10 are stacked in two steps 24 (4 × 2). X 3) The heart is housed. Here, although an intermittent tape core is described as an example of the tape core, a normal (non-intermittent) tape core may be used.

  In the intermittent tape core, a plurality of optical fiber cores are arranged in a parallel line, and adjacent optical fiber cores are intermittently connected by the connecting portion and the non-connecting portion. Specifically, FIG. 2 (A) shows a state in which the intermittent tape core is closed, and FIG. 2 (B) shows a state in which the intermittent tape core is opened in the arrangement direction. The four optical fiber cores 11 to 14 are arranged in a parallel row (also referred to as a four-core intermittent tape core), and adjacent optical fiber cores are intermittently connected by the connecting portion 15a and the nonconnecting portion 15b. ing.

  An optical fiber core wire accommodated in the intermittent tape core wire is a glass fiber having a standard outer diameter of 125 μm coated with a coating outer diameter of about 250 μm, or what is called an optical fiber strand. It may be provided with a colored coating, and the number of optical fiber cores accommodated is also arbitrary. In addition, the intermittent tape core wire does not have to be provided with a connecting part and a non-connecting part every one core, for example, even if core wires of two cores are integrated intermittently by the connecting part and the non-connecting part Good.

  As shown in FIG. 1, two tension members 22 are disposed on both sides of the intermittent tape core wire 10. The tension member 22 is also referred to as a tensile member, and a wire having a resistance against tension and compression is used. As the wire, for example, a steel wire having an outer diameter of about 1.0 mm, FRP (Fiber Reinforced Plastics), or the like is used, and extends along the longitudinal direction of the optical fiber cable 1. An adhesive layer for adhering the tension member 22 and the cable jacket 30 is applied to the outer periphery of the tension member 22.

  The two intervening tapes 24 are disposed in the direction orthogonal to the direction in which the two tension members 22 are connected, and provided so as to sandwich the intermittent tape core wire 10. The intervening tape 24 is, for example, a tape-like member made of, for example, polyethylene terephthalate (PET) formed with a thickness of 0.1 mm or less, and formed with a width such that the end 24a of the intervening tape and the intervening cord 26 can contact. It extends along the longitudinal direction of the optical fiber cable 1.

  The intervening cords 26 are respectively disposed between the adjacent tension members 22 and the intermittent ribbon cable 10 and extend along the longitudinal direction of the optical fiber cable 1. The outer circumferential surface of the intervening cord 26 is in contact with the inner surface of the end 24a of the intervening tape, and the contact portion of the intervening tape 26 can prevent the cable jacket 30 from entering. Therefore, the intermittent tape core 10 is not in contact with the cable jacket 30, and the intermittent tape core 10 inside can be protected when the cable jacket 30 is extruded by the intervening tape 24 and the intervening cord 26. . The interposing cord 26 is formed of, for example, a fibrous plastic material such as polyamide, PET or polypropylene, but a water absorbing agent (for example, a water absorbing powder) may be added to the interposing cord 26. When the intervening cords function as a water absorbing layer, when the water infiltrates, it is possible to stop the intermittent tape core.

  The cable jacket 30 is formed in a rectangular shape whose cross-sectional outer shape is, for example, about 10 mm in major axis and about 4 mm in minor axis (also referred to as short diameter flat type), and at positions sandwiching two intervening cords 26 , And two pairs of tear-away notches 35 are provided. In addition, the cutting notch 35 corresponds to the notch of this invention.

  The cutting notch 35 is formed in a V-shaped cross section, and the tip located on the bisector of the V is formed toward the intervening string 26. More specifically, the interposition cord 26 has a projecting part 26 a that protrudes from the end 24 a of the interposition tape toward the adjacent tension member 22, and the tips of the pair of tear notches 35 facing each other across the interposition cord 26 Only the cable jacket 30 and the protrusion 26a are provided on the line connecting the two.

FIGS. 3 to 5 are explanatory views when taking out the optical fiber ribbon from the optical fiber cable of the first embodiment.
First, as shown in FIG. 3, the optical fiber cable 1 is cut in the cable longitudinal direction by the bevel blade nipper N. Specifically, the operator holds the grip portion N2 of the oblique blade nipper N, and places the cutting edge of the blade portion N1 along the longitudinal direction of the cable near the position of the cutting notch 35. When a pair of tearing notches 35 facing each other across the intervening string 26 described in FIG. 1 is grasped by the blade N1, as shown in FIG. 5A, a cut 40 reaching the intervening string 26 from the tip of the tearing notch 35. Enters.

Similarly, in the vicinity of the position of the other cutting notch 35, when the pair of facing cutting notches 35 are grasped by the blade portion N1, as shown in FIG. 5A, a cut 40 for dividing the intervening string 26 is made.
When these cutting operations are performed two or three times along the longitudinal direction of the cable, the fragments 31, 32 including the tension member 22 and a part of the projecting portion 26a of the intervening string 26 are It can be pulled away.

  Next, as shown in FIG. 4, the optical fiber cable 1 is cut by the bevel blade nipper N in the direction orthogonal to the longitudinal direction of the cable. By doing this, the fragments 31 and 32 are pulled off, and as shown in FIG. 5 (B), the protruding portion 26 a of the intervening cord 26 divided by the cut 40 appears.

And if this intervening string 26 is pinched and removed, since the intermittent tape core wire 10 will be exposed from the both sides of the fragment 33 as shown in FIG. 5 (C), if the segment 33 and the intervening tape 24 are removed, the intermittent tape The core 10 can be taken out.
As described above, only the cable jacket 30 and the protruding portion 26a of the intervening cord, not the intervening tape 24, are provided on the line connecting the ends of the cutting notches 35, without damaging the optical fiber core wire, The cable sheath and the intervening cord can be cut with a general tool such as a bevel blade nipper to easily disassemble the optical fiber cable.

In this embodiment, the optical fiber cable is cut in the cable longitudinal direction with the oblique blade nipper, and then cut in the direction orthogonal to the cable longitudinal direction with the oblique blade nipper. However, after being cut in the direction orthogonal to the cable longitudinal direction , In the longitudinal direction of the cable.
Further, although the example of cutting with the bevel blade nipper has been described, the optical fiber cable may be disassembled with a dedicated tool provided with a blade or a rail.

FIG. 6 is a view showing an example of the optical fiber cable according to the second embodiment. In the second embodiment, although the shape of the cable jacket is different from that of the first embodiment, the intermittent tape core wire 10, the tension member 22, the intervening tape 24, and the intervening cord 26 are the same as in the first embodiment. , I will focus on different points.
The cable jacket 30 of the second embodiment is a short-diameter flat type as in the first embodiment, but the portion where the intermittent tape core wire 10 is disposed in the direction orthogonal to the direction connecting the two tension members 22. The width of the cable jacket 30 is made larger than the width of the cable jacket 30 at the places where the intermittent tape cores 10 disposed at both sides thereof are not disposed.

  In the optical fiber cable of the second embodiment, when the optical fiber cable is disassembled along its longitudinal direction by the oblique blade nipper, the oblique blade nipper is unlikely to exceed the large-width fragment 33 when moving the oblique blade nipper Therefore, the cutting edge can be cut easily and attached near the cutting notch 35, and the pieces 31, 32 can be quickly pulled apart.

  FIG. 7 is a view showing an example of the optical fiber cable according to the third embodiment. The third embodiment differs from the first embodiment in that a large internal space is formed around the intermittent tape core. Specifically, the outer peripheral surface of the intervening cord 26 is in contact with the inner surface of the end 24 a of the intervening tape, and the intermittent tape core wire 10 is disposed, and divided by two intervening cords 26 and two intervening tapes 24 Inside, there is an internal space S in which the cable jacket 30 is not filled.

Thus, if the internal space S is formed around the intermittent tape core 10, the bending force due to the pressure from the cable jacket 30 does not act directly on the intermittent tape core 10. Therefore, the pressure from the cable jacket 30 Damage to the optical fiber can be further prevented.
It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the meaning described above but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

DESCRIPTION OF SYMBOLS 1 ... Optical fiber cable, 10 ... Intermittent tape core wire, 11-14 ... Optical fiber core wire, 15a ... Coupling part, 15b ... Non-coupling part, 22 ... Tension member, 24 ... Interposition tape, 24a ... End part of interposition tape , 26: Intervening string, 26a: Protrusion, 30: Cable jacket, 31 to 33: Fragment, 35: Rip notch, 40: Break.

Claims (4)

At least one tape ribbon, two tension members disposed on both sides of the tape ribbon, and the two ribbons disposed across the tape ribbon in a direction perpendicular to a direction connecting the two tension members. Two intervening tapes, Two intervening strings respectively disposed between the tension member and the core of the tape and in contact with the end of the intervening tape, the two tension members, and the two sheets A cable jacket obtained by collectively covering an intervening tape and the two intervening cords, and a surface of the cable sheathing, which are formed on both sides of the intervening cord in a direction orthogonal to the direction connecting the two tension members. A fiber optic cable with two pairs of notches,
The intervening cord has a protrusion projecting from the end of the intervening tape toward the adjacent tension member, and the tip of the notch is connected in a direction orthogonal to the direction connecting the two tension members. An optical fiber cable in which the tape core wire, the tension member, and the intervening tape do not exist on a line, and only the cable jacket and the protrusion are provided.   In the direction perpendicular to the direction in which the two tension members are connected, the width of the cable jacket at the position where the tape core is arranged is larger than the width of the cable jacket at the position where the tape core is not arranged. The optical fiber cable according to claim 1.   The optical fiber cable according to claim 1 or 2, wherein an inner space not filled with the cable jacket is formed between the tape core wire and the intervening cord. The optical fiber cable according to any one of claims 1 to 3, wherein a water absorbing agent is applied to the intervening cord.

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