JP4624205B2 - Fiber optic cable - Google Patents

Description

  The present invention relates to a self-supporting optical fiber cable composed of a main body portion and a support wire portion used for drawing an optical fiber indoors from the outdoors.

  With the rapid spread of the Internet, etc., in addition to increasing the speed of information communication and increasing the amount of information, the construction of an optical network for two-way communication and large-capacity communication has recently progressed. FTTH (Fiber To The Home) service that provides high-speed communication services has been started. For this reason, the demand of the optical fiber cable said to be a drop cable used for drawing in in the house is increasing.

  For example, as shown in FIG. 3A, this optical fiber cable is configured by integrally connecting the main body 1 and the support wire 2 with a neck 3 that can be cut (see, for example, Patent Document 1). . The main body 1 is formed by, for example, arranging tension members 5 in parallel on both sides of a tape-shaped optical fiber core 4 and integrally covering and housing the main body 1 with a main body jacket 6. Further, tearing notches 9 are provided on both side surfaces of the main body jacket 6 so that the inner optical fiber core wire 4 can be easily taken out. The support wire portion 2 covers a support wire 7 made of a high tensile strength wire such as a steel wire with a support wire portion jacket 8 formed through the neck portion 3 simultaneously with the formation of the body portion jacket 6.

  When laying the optical fiber cable, the support wire portion 2 is partially separated from the main body portion 1 in order to apply tension to the structure and to fix the main body portion 1 to a closure or the like. Also, when used for indoor optical wiring, the support wire portion 2 is used by being separated from the main body portion 1. For this reason, the main-body part 1 and the support wire part 2 are connected and integrated through the narrow neck part 3 so that it can be easily separated by hand. When this optical fiber cable is wound around a bobbin or the like in the manufacturing process, if the straight line passing through the center of the main body 1 and the center of the support wire 2 is the cable center axis Y, the cable center axis Y is the bobbin winding center. It is wound up so that it may become parallel to.

In the conventional optical fiber cable, for example, the lateral width L1 of the main body 1 is about 2.0 mm, the height width L2 is about 3.1 mm, and the overall height L3 including the support line portion 2 is about 5.3 mm. The diameter of the support wire part 2 is about 2.0 mm. That is, the height width L2 and the total height L3 are increased with respect to the lateral width L1. For this reason, the optical fiber cable is not twisted on the surface of a roller or the like in the manufacturing process, and when it is wound around the bobbin, it is wound in a form that winds up the tape. Can be handled easily.
JP 2003-207697 A

  However, the main body portion 1 and the support wire portion 2 of the optical fiber cable are connected by a narrow neck portion 3 for the purpose of easily dividing. For this reason, a constricted gap portion exists between the main body 1 and the support wire portion 2 and the cables are easily caught, and a careful operation is required when the cable is extended. Further, for example, if the cable portion is forced out in a state where force is applied to the gap portion, for example, the connection by the neck portion 3 is broken and the main body portion 1 and the support wire portion 2 are separated. was there.

  In addition, since the scissors pierce the laying tube in the portion of the notch 9 for facilitating taking out the optical fiber core 4 inside, the optical fiber core is damaged. An optical fiber cable thicker than the length of the laying tube has been developed. According to the analysis of the optical fiber cable actually damaged by the wrinkle, the thickness of the main body jacket 6 is required to be 2.0 mm or more. Therefore, as shown in FIG. 3 (B), the main body jacket 6 is, for example, a cross-sectional square having a lateral width L1 of 5.6 mm, a height width L2 of 5.6 mm, and an overall height L3 of 7.8 mm. Suppose that it forms. In addition, since the diameter of the support line part 2 uses the existing stopper, it is 2.0 mm as usual.

  The above-mentioned Patent Document 1 also discloses an example in which the lateral width of the main body jacket is increased. However, when the lateral width L1 of the main body jacket 6 is increased as shown in FIG. A slight fluctuation in tension makes the cable itself easy to roll and twists. Further, if the thickness of the support wire portion 2 remains the same as the conventional size, the support wire portion 2 having the highest rigidity is in a state of floating from the winding surface so that a space exists between the support wire portion 2 and the winding surface. Become. For this reason, if tension is applied to the support wire 7 during winding of the optical fiber cable, a force that moves in the center direction of the winding acts on the support wire portion 2, and the neck portion 3 is broken or light is wound on top of it. There arises a problem that the fiber cable holds the neck 3 of the lower optical fiber cable floating and breaks it.

  The present invention has been made in view of the above-described circumstances, and it is easy to separate the support wire portion and the main body portion, and the support wire portion is broken when being wound around the drum or being fed from the drum. It is an object of the present invention to provide a self-supporting optical fiber cable that is not damaged.

Optical fiber cable according to the present invention is a self-supporting optical fiber cable comprising a supporting wire body portion, said body portion main body by arranging in parallel the tension member and one or more optical fibers The support wire part is covered and accommodated integrally by an outer cover , and the support wire part is covered with a protective covering and is covered with a support line part outer cover formed integrally with the main body part cover , equal body outer object of the horizontal width and said support wire outer the breadth, in cross section rectangular overall shape, it is spaced apart portions of the cable center is integrated in the connecting portions on both sides near the cable, and , the protective coating of the support lines that are partially exposed by the separation portion.

Further, adhesion between the protective coating supporting region line and support wire outer be found to secure the support wire outer the side pullout force when pulling 10mm protective coating is to be 5N~40N The Further, a separation notch is formed on the outer surface side of the coupling portion, and the outer surface of the body portion jacket is formed outside the circumference of a radius of 2.0 mm with the optical fiber core wire housed in the center.

  According to the present invention, since there is no constricted portion between the main body portion and the support wire portion of the optical fiber cable, the support wire portion can be used even when the optical fiber cable is wound around the bobbin or when being fed out from the bobbin. Can be prevented from being broken and broken from the main body, and the main body and the support wire can be easily separated as required. In addition, since the width of the outer shell of the main body can be increased, obstacles caused by wrinkles can be eliminated.

  An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a first embodiment, and FIG. 2 is a diagram illustrating a second embodiment. In the figure, 11 is a main body part, 12 is a support line part, 13 is a connecting part, 14 is an optical fiber core wire, 15 is a tension member, 16 is a main body part sheath, 17 is a support line, 18 is a support line part sheath. , 19 is a tear notch, 20 is a protective coating, 21 is a separated portion, 22 is a separation notch, and 23 is an internal gap.

  The optical fiber cable according to the present invention is a self-supporting type optical fiber cable including a main body 11 and a support wire 12 as shown in FIG. Are connected and integrated by connecting portions 13 on both sides of the cable. For example, one or more optical fiber core wires 14 are arranged in the central portion of the main body portion 11, and a tension member 15 is arranged in parallel with the optical fiber core wire 14. It consists of

  The optical fiber 14 in the present invention is called an optical fiber in which a glass fiber having a standard outer diameter of 125 μm is coated with a coating outer diameter of about 250 μm, and further, a reinforcing coating is applied to the outside thereof. It shall include all components. The optical fiber core 14 is arranged by directly covering one to several cores with the body jacket 16, but a plurality of optical fiber cores as shown in FIG. 3 are integrated with a common coating. You may use with the form which arranged the tape-shaped optical fiber core wire which arranged.

  As the tension member 15 disposed in parallel with the optical fiber core 14, a steel wire having an outer diameter of about 0.4 mm, glass fiber reinforced plastic (FRP), aramid fiber reinforced plastic (K-FRP), or the like can be used. The tension member 15 is generally disposed on a central axis Y that sandwiches the optical fiber core wire 14 from both sides and passes through the centers of the main body portion 11 and the support wire portion 12, but is not particularly limited thereto. For example, the tension member 15 may be disposed at the center of the main body 11 and the optical fiber cores 14 may be disposed on both sides thereof, or as disclosed in Patent Document 1, the optical fiber cores 14 are sandwiched. It may be arranged on both sides of the central axis Y.

  The main body casing 16 is made of a thermoplastic resin such as polyethylene (PE) or polyvinyl chloride (PVC), and has a rectangular cross section with flat sides. In addition, even if it says a rectangular-shaped cross section, it does not need to be a exact | strict rectangle but the shape close | similar to the ellipse by which the corner | angular part was rounded may be sufficient. V-shaped tear notches 19 for taking out the inner optical fiber core wire 14 can be provided on both side surfaces of the body jacket 16. If a special tearing tool can be used, the tear notch 19 is not always necessary.

Support wire 12 is formed by coating through Riho protection cover 20 by the support wire 17 made of a high tensile strength wire of steel wire or the like to a support line outer sheath 18. The support wire portion jacket 18 is formed of the same resin material as that of the body portion jacket 16 at the same time as the body portion jacket 16 is molded, and the optical fiber core wire 14, the tension member 15 and the support wire 17 are integrated. The protective coating 20 is formed in advance so that the diameter of the support wire portion 12 has a predetermined outer diameter, and can be fixed with an existing detent tool.

  The support line portion jacket 18 is molded so that the width of the support line portion 12 is substantially equal to the width of the main body portion 11. That is, the side surface of the main body portion 11 and the side surface of the support line portion 12 are substantially the same surface, and the overall shape including the side surface of the main body portion 11 and the support line portion 12 has a cross section with a lateral width of L1 and a height of L3. Make it rectangular. As a result, the optical fiber cable is not twisted on the surface of a roller or the like in its production line, and is wound in a form that winds up the tape when it is wound around the bobbin. Can do. Further, since there is no large constriction between the optical fiber cable main body 11 and the support wire portion 12, the support wire portion 12 can be used when the optical fiber cable is wound around the bobbin or when it is fed out from the bobbin. Can be prevented from being caught and broken from the main body 11.

The main body part 11 and the support line part 12 are connected and integrated by a connecting part 13 in the vicinity of both narrow sides. This connecting portion 13 corresponds to the neck portion 3 in FIG. 3. In the present invention, the connecting portion 13 is formed in the vicinity of both side surfaces of the cable, and between the connecting portions 13 on both sides, the main body portion. A slit or slot-like separation portion 21 is provided for separating the support 11 and the support wire portion 12. The separated portion 21, a part of the protective coating 20 of the support wire 17 is exposed. Due to the separation portion 21, the main body portion 11 and the support wire portion 12 are structurally separated, the thickness of the connecting portion 13 in the horizontal width direction can be reduced, and the main body portion 11 and the support wire portion 12 can be easily separated. Can be.

  Further, a separation notch 22 can be provided on the outside of the connecting portion 13. The separation notch 22 is formed, for example, by a V-shaped groove at a position that coincides with the separation portion 21. The separation notch 22 indicates the position of the separation portion 21, that is, the position of the support line portion 12, and reduces the thickness of the connecting portion 13 to facilitate separation of the main body portion 11 and the support line portion 12. . When the support wire portion 12 is separated from the main body portion 11, the separation notch 22 can be cut with a nipper or a cutter, and the main body portion 11 can be easily separated by being bent or separated from each other.

The support wire portion 12 separated from the main body portion 11 can be fixed using an existing standard specification retaining tool (not shown) as it is by removing the support wire portion jacket 18. For this reason, it is preferable that the support wire portion jacket 18 is removably bonded to the protective coating 20. Specifically, in a state where the support wire portion jacket 18 is removed from the protective coating 20 and the support wire portion 12 is fixed to the retainer and a force is applied to the main body portion 11 in the axial direction, Although the covering 18 and the protective coating 20 are not separated, it is desirable that the covering wire 18 has an adhesive strength that can be peeled off from the protective coating 20 at a work site or the like.

  When this adhesive strength was tested in the field working state, it was appropriate that the pulling force when the support wire outer sheath 18 was fixed and the protective coating 20 was pulled 10 mm was 5 N to 40 N. In order to peel off the support wire portion jacket 18 from the protective coating 20, the peeling can be easily performed by using a part of the protective coating 20 exposed in the separation portion 21.

  Next, a second embodiment of FIG. 2 will be described. The embodiment shown in FIG. 2 is different from the embodiment shown in FIG. 1 in that the lateral width L1 of the optical fiber cable is formed larger, but the optical fiber core wire 14, the tension member 15, Since the support wire 17 and the protective coating 20 are the same, description thereof will be omitted.

  In the optical fiber cable of FIG. 2, when the optical fiber core wire 14 is arranged at the center of the main body portion 11, the outer surface of the main body sheath 16 is outside the radius R of 2.0 mm or more centered on the optical fiber core wire 14. To be formed. By configuring the outer surface of the main body jacket 16 to be separated from the optical fiber core wire by 2.0 mm or more, the spawning tube is optical fiber even if the spear pierces the spawn tube toward the optical fiber core wire 14. It can be expected that the core line 14 will not be reached. Thereby, it can prevent reliably damaging the optical fiber core wire 14 by laying a spawning tube of a spider without using a special structure.

  Further, instead of providing a tear notch on the outer surface of the main body jacket 16 as shown in FIG. 1, an internal gap 23 can be provided along the optical fiber core wire 14 inside the main body jacket 16. For example, the internal space 23 may have a triangular shape as shown in the figure, but may have a circular shape. Further, when the internal gap 23 is triangular, it is preferable that one end of the triangle has a tip that faces inward, and the tip is slightly deviated from the optical fiber core wire 14.

  Also in the example of FIG. 2, the support line portion jacket 18 is formed integrally with the main body portion cover 16, and the main body portion 11 and the support line portion 12 are connected and integrated by the connecting portions 13 in the vicinity of the narrow sides. In addition, a slit or slot-like separation portion 21 that separates the main body portion 11 and the support wire portion 12 is provided between the connecting portions 13 on both sides. The separation portion 21 is arranged so that a part of the protective coating 20 of the support line 17 is exposed, and the main body portion 11 and the support wire portion 12 are structurally separated by the separation portion 21, A separable configuration is adopted.

  The support wire portion jacket 18 can be formed to be the same as the side surface of the main body portion jacket 16 as in the example of FIG. 1, and the overall shape including the side surface of the main body portion 11 and the support line portion 12 is as follows. The cross section having a lateral width L1 and a height L3 is substantially rectangular. Moreover, although the separation notch may be provided in the connection part 13 similarly to the example of FIG. 1, it is not necessary to provide it. However, since the boundary between the main body portion 11 and the support wire portion 12 is difficult to understand from the outside, an identifiable line may be attached instead of providing a notch to clearly indicate the position of the separation portion 21. Further, an identification line (not shown) indicating the position of the internal space 23 may be provided in the same manner.

  As a result, the optical fiber cable is not twisted on the surface of a roller or the like in its production line, and is wound in a form that winds up the tape when it is wound around the bobbin. Can do. Furthermore, since there is no constriction between the optical fiber cable main body 11 and the support wire portion 12, the support wire portion is caught when the optical fiber cable is wound around the bobbin or when being fed out from the bobbin. It is possible to prevent the main body from being broken. Furthermore, when branching or forming the end of the optical fiber core wire 14, the inner optical fiber core wire can be easily cut by cutting into the internal air gap 23 on both sides and tearing between the tips of the internal air gap 23. Can be taken out.

It is a figure explaining 1st Embodiment of the optical fiber cable by this invention. It is a figure explaining 2nd Embodiment of the optical fiber cable by this invention. It is a figure explaining a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Main-body part, 12 ... Support wire part, 13 ... Connection part, 14 ... Optical fiber core wire, 15 ... Tension member, 16 ... Main-body part jacket, 17 ... Support line, 18 ... Support line part jacket, 19 ... Tear notch, 20 ... protective coating, 21 ... spaced portion, 22 ... separation notch, 23 ... internal void.

Claims (4)

A self-supporting optical fiber cable comprising a main body part and a support wire part, wherein the main body part has a tension member and one or more optical fiber cores arranged in parallel and is integrally covered and accommodated by a main body jacket. The support line part is formed by covering the support line with a protective covering and covering with a support line part cover formed integrally with the body part cover. The width of the support wire jacket is equal, the cross section as a whole is rectangular, separated by a separation portion at the center of the cable and integrated at the connecting portions near both sides of the cable , and the protective covering of the support wire is provided. An optical fiber cable, wherein the optical fiber cable is partially exposed at the separated portion . The optical fiber cable according to claim 1, wherein a separation notch is formed on an outer surface side of the connecting portion. The adhesion force between the protective coating of the support wire and the support wire jacket is that the support wire jacket is fixed and the pulling force when the protective coating is pulled out by 10 mm is 5N to 40N. The optical fiber cable according to claim 1 , wherein Said body outer object of the outer surface, light of any one of claim 1 to 3, characterized in that outside circumference of radius 2.0mm around a housed said optical fiber Fiber cable.

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