JP5380515B2 - Optical fiber cable and optical fiber cable wiring method - Google Patents

Description

  The present invention relates to an optical fiber cable suitable for wiring on a wall surface including corners and a wiring method thereof.

  In recent years, with the development of FTTH (Fiber To The Home), optical fiber cables are frequently wired to users' homes and the like. In a user's house, for example, it is necessary to route an optical fiber cable along a wall such as an indoor wall or a passage, so an optical fiber cable as described in Patent Document 1 is used.

  In order to route the optical fiber cable to the wall in the room, it is necessary to route the optical fiber cable according to the bending angle at the beam portion of the wall surface, the corner of the room, the bent portion of the hallway, or the like. When the optical fiber cable is bent according to the bending angle, the cable bending according to the bending angle is applied to the optical fiber cable. It is known that the life and transmission loss characteristics of an optical fiber are reduced by the bending R of the optical fiber itself, and it is desirable that the bending R be large.

  Under such circumstances, an optical fiber cable in which deterioration of transmission characteristics due to bending of the optical fiber itself is greatly suppressed by improving the performance of the optical fiber itself has been put into practical use. For example, ITU-T G.I. The optical fiber standardized by 657 B3 can cope with a very small bending with a loss increase of 0.15 dB (wavelength 1550 nm) or less even when the bending R is 5 mm.

JP 2009-128495 A

  In such an optical fiber cable, a very small difference in bending radius in mm units actually affects the performance of a transmission line using the cable.

  In consideration of the above circumstances, the present invention enables wiring without excessive lifting while suppressing the increase in transmission loss while increasing the bending of the optical fiber core wire than the bending of the corner when wiring along the wall surface. It is an object of the present invention to provide an optical fiber cable and an optical fiber cable wiring method.

  1st invention has an element part which coat | covers an optical fiber core wire and a tension body with a jacket, and two cable wiring surfaces which contact | connect a wall surface, and the cable thickness perpendicular | vertical to the cable length direction of the said element part Two element support portions that are thicker in the direction than the element portion and disposed on both sides of the element portion, and the element portion so as to support the element portion upward from each cable wiring surface in the air state. And a neck portion that connects the element support portion and the element support portion continuously or discontinuously in the cable length direction. The wall surfaces include not only walls partitioning each room, but also ceiling walls, floor walls, outdoor house wall surfaces, corridor wall surfaces in apartment houses, and the like.

  A second invention is characterized in that, in the first invention, another tensile strength member is provided on the two element support portions on the same line as the optical fiber core wire and the strength member provided on the element portion. Yes.

  A third invention is characterized in that, in the first or second invention, the neck portion can be separated from the element support portion at the time of cable wiring to the wall surface.

  According to a fourth invention, in any one of the first to third inventions, the element portion has a surplus length of 0 to 1% with respect to a total length of the optical fiber cable.

  According to a fifth invention, in any one of the first to fourth inventions, a notch groove for taking out the optical fiber core wire is formed in the element portion along a cable length direction. It is said.

  6th invention is the wiring method of the optical fiber cable which wires the optical fiber cable of any one of 1st-5th invention along a wall surface, Comprising: The said neck part of the part corresponding to the corner | angular part of the said wall surface And the optical fiber cable is wired.

  According to the optical fiber cable of the present invention, the two element support portions connected to both sides of the element portion via the neck portion support the element portion in the air state upward from the cable wiring surface of the element support portion. Therefore, when the optical fiber cable is routed from the inner wall to the outer wall through the gap of the door, at the corner of the wall surface, from the cable wiring surface in contact with the wall surface to the optical fiber core wire of the element portion above Therefore, the bending radius R of the optical fiber becomes larger than the bending radius R of the corner portion. Therefore, since the optical fiber cable can be wired with the bending R of the optical fiber core larger than the bending R of the corner portion, an increase in transmission loss of the optical fiber core can be suppressed. In addition, since the element part is connected to the element support part by a neck part that is connected continuously or discontinuously, the element part is not greatly lifted off the wall surface, and when carrying parts and objects such as human hands and feet. There is no danger of catching, and the beauty is not impaired.

FIG. 1 is a plan view of an optical fiber cable in which a neck portion that connects an element portion and an element support portion is continuous. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view when the optical fiber cable of FIG. 1 is wired on a wall surface having a corner. FIG. 4 is a plan view of an optical fiber cable in which the neck portion connecting the element portion and the element support portion is discontinuous. 5A is a cross-sectional view taken along the line BB in FIG. 4, and FIG. 5B is a cross-sectional view taken along the line CC in FIG. FIG. 6 is a cross-sectional view when the optical fiber cable of FIG. 4 is wired on a wall surface having a protruding corner with a corner portion protruding outward. FIG. 7 is a cross-sectional view of the case where the optical fiber cable of FIG. 4 is wired on a wall surface having a corner where the corner is retracted inward. FIG. 8 is a cross-sectional view in which an optical fiber cable is wired on a wall surface having a protruding corner when the element portion has a surplus length with respect to the entire length of the optical fiber cable, and (A) is an example of an appropriate surplus length. (B) is an example in which the extra length is too long. FIG. 9 is a cross-sectional view in which an optical fiber cable is wired to a wall surface having a corner when the element portion has a surplus length with respect to the entire length of the optical fiber cable, and (A) is an example of an appropriate surplus length. (B) is an example in which the extra length is short, and (C) is an example in which the extra length is too long. FIGS. 10A and 10B are cross-sectional views when an optical fiber cable including only an element portion without an element support portion is wired on a wall surface having a corner portion, where FIG. 10A is an example of a protruding corner, and FIG. is there. FIG. 11 is a cross-sectional view of an optical fiber cable according to another embodiment in which the element support portion has a horizontally long rectangular shape.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

“First Embodiment”
1 is a plan view of an optical fiber cable in which a neck portion connecting an element portion and an element support portion is continuous, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. It is sectional drawing at the time of wiring a fiber cable.

  As shown in FIGS. 1 and 2, the optical fiber cable 1 according to the first embodiment includes an element portion 2, two element support portions 3 disposed on both sides of the element portion 2, an element portion 2, and an element A neck portion 4 that continuously connects the support portion 3 in the cable length direction A is provided.

  The element portion 2 includes an optical fiber core wire 5, two strength members 6 and 6 disposed along the cable length direction A on both sides of the optical fiber core wire 5, and these optical fiber core wires. 5 and a jacket 7 covering the strength members 6 and 6.

  The optical fiber core wire 5 is composed of, for example, a glass optical fiber provided at the center, a fiber coating layer that covers the outer periphery of the glass optical fiber, and a colored layer that forms the outermost layer coated thereon. The

  The strength members 6 and 6 include, for example, metal materials such as gold, silver, steel, iron, copper, aluminum, aluminum alloy, copper clad aluminum, and FRP rods using engineer plastic materials (for example, FRP rods using aramid fibers). ), Glass FRP rods and the like are used. The shape of the strength members 6 and 6 may be a square or an ellipse in addition to the circle shown in FIG.

  For the jacket 7, a general thermoplastic resin such as polyethylene, polypropylene, or polystyrene is used. The outer jacket 7 covers the whole of the optical fiber core wire 5 in a state where two strength members 6 and 6 are arranged on the same line on both sides thereof, and is perpendicular to the cable length direction A. The cross section is a horizontally long rectangle.

  A notch groove 8 for taking out the optical fiber core wire 5 is formed in the jacket 7 along the cable length direction A. The notch groove 8 is formed in a V-shaped groove so that the tip thereof faces the optical fiber core wire 5. The position where the notch groove 8 is provided is a position corresponding to the optical fiber core wire 5. By providing the notch groove 8, it is possible to peel the jacket 7 from this portion and take out the optical fiber core wire 5.

  The element support portion 3 has a vertically long cross section perpendicular to the cable length direction A. The element support portion 3 has two cable wiring surfaces 3 a that are in contact with the wall surface 9. The cable wiring surface 3a has two rectangular short sides. The element support portion 3 has a thickness T1 in the cable thickness direction B perpendicular to the cable length direction A greater than the thickness T2 of the element portion 2 in the cable thickness direction B. The element support part 3 is formed of the same material as the outer cover 7 of the element part 2.

  In addition, a tensile strength body 10 different from the tensile strength body 6 provided in the element portion 2 is embedded in the element support portion 3 at the center thereof. The tensile body 10 provided in the element support portion 3 may be formed of the same material as that of the tensile body 6 provided in the element portion 2 or may be designed by a combination of materials used in the previous element portion 2. The size is also appropriately determined depending on conditions and the like. The shape of the strength member 10 may be a square or an ellipse in addition to the circle shown in FIG. In this embodiment, the strength member 10 is provided. However, the element support portion 3 may not have the strength member 10.

  The neck portion 4 continuously connects the element portion 2 and the element support portion 3 in the cable length direction, and supports the element portion 2 in an upward state from the cable wiring surface 3a in contact with the wall surface 9. Thereby, a space portion 11 having a predetermined distance H is formed between the cable wiring surface 3a and the element portion 2. The neck portion 4 has a thickness T3 that is thinner than the thickness T2 of the element portion 2. The neck portion 4 is provided on the same line 12 that connects the centers of the optical fiber core 5 and the strength member 6 provided in the element portion 2 and the strength member 10 of the element support portion 3.

  The neck portion 4 is formed of the same thermoplastic resin as the outer cover 7 of the element portion 2 and the element support portion 3. Note that the outer cover 7, the element support portion 3, and the neck portion 4 of the element portion 2 are all formed by being integrally molded with the same thermoplastic resin.

  FIG. 3 shows a state in which the optical fiber cable 1 configured as described above is wired on the wall surface 9 having a corner portion (protruding corner) protruding outward. The optical fiber cable 1 is routed along a bend with the cable wiring surface 3a of any one of the element support portions 3 in contact with the wall surface 9. The element portion 2 is supported in the air at a predetermined distance H from the cable wiring surface 3a.

  In the optical fiber cable 1 thus wired, as shown in FIG. 3, the bending radius R of the optical fiber core wire 5 is larger than the bending radius R1 of the corner at the corner of the wall surface 9. That is, since the element part 2 is supported in the air state at a predetermined distance H from the cable wiring surface 3a in contact with the wall surface 9, the optical fiber core wire 5 is the distance from the cable wiring surface 3a to the optical fiber core wire 5. The bending radius R is larger than the corner bending radius R1.

  On the other hand, as shown in FIG. 10 (A), the optical fiber cable 100 consisting only of the element portion 2 that does not have the element support portion 3 and the neck portion 4 has a protruding corner with a corner portion protruding outward. When wiring is performed on the wall surface 9, the lower surface 2 a (or the upper surface 2 a) of the upper and lower surfaces 2 a and 2 a that are the long sides of the element portion 2 is in contact with the wall surface 9. In the case of such a wiring form, the bending radius R of the optical fiber core wire 5 decreases as the corner bending radius R1 decreases, and the transmission loss of the optical fiber core wire 5 increases. However, in this embodiment, since the element portion 2 is floated from the wall surface 9, the bending radius R of the optical fiber core wire 5 can be increased by the amount of the floating, and the element portion 2 is affected by the bending radius R 1 of the corner portion. It becomes difficult.

  In the optical fiber cable 1 of the present embodiment, the element portion 2 is in a state of being floated by a predetermined distance H from the wall surface 9 when wired to the wall surface 9 having a corner portion. The element part 2 does not protrude greatly at the corners. Therefore, the optical fiber cable 1 is not hooked when carrying parts or objects such as human hands and feet, and the aesthetic appearance is not impaired because it does not protrude greatly.

“Second Embodiment”
4 is a plan view of an optical fiber cable in which the neck portion connecting the element portion and the element support portion is discontinuous, FIG. 5A is a cross-sectional view taken along the line BB of FIG. 4, and FIG. FIG. 6 is a cross-sectional view when the optical fiber cable of FIG. 4 is wired on a wall surface having a protruding corner whose corners protrude outward.

  In the optical fiber cable 101 of the second embodiment, the neck 4 is not continuous in the cable length direction A but discontinuous with respect to the optical fiber cable 1 of the first embodiment. Regarding other configurations, the optical fiber cable 101 of the second embodiment is the same as the optical fiber cable 1 of the first embodiment, and the same components are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 4, the neck 4 is provided intermittently in the cable length direction A. At the position where the neck portion 4 is provided, the element portion 2 and the element support portion 3 are connected as shown in FIG. At a position where the neck portion 4 is not present, the element portion 2 and the element support portion 3 are separated as shown in FIG. 5B, and the element portion 2 can freely move from the element support portion 3.

  FIG. 6 shows a state where the optical fiber cable 101 configured as described above is wired on the wall surface 9 having a corner portion (protruding corner) protruding outward. The optical fiber cable 101 is routed along a bend with the cable wiring surface 3a of any one of the element support portions 3 in contact with the wall surface 9. In this optical fiber cable 101, wiring is performed so that a portion without the neck portion 4 comes to a corner portion. Since the element portion 2 is not connected to the element support portions 3 on both sides in the portion where the neck portion 4 is not provided, the bending radius R of the optical fiber core wire 5 is greatly bent as shown in FIG. Bigger than. Note that the element portion 2 corresponding to the corner portion does not protrude outward from the element support portion 3 even if it is largely curved.

  Moreover, the state which wired this optical fiber cable 101 to the wall surface 9 with the entrance corner into which a corner | angular part retracts inside is shown in FIG. In the case of the entering corner, the bending radius R of the optical fiber core wire 5 is larger than the bending radius R1 of the corner portion because the element portion 2 is greatly curved as in the case of the exit corner. In addition, the element part 2 corresponding to this corner | angular part does not protrude outside the element support part 3. FIG.

  On the other hand, as shown in FIG. 10 (B), an optical fiber cable 100 consisting only of the element portion 2 that does not have the element support portion 3 and the neck portion 4 is attached to the wall surface 9 having a corner where the corner portion is retracted inward. When wiring is performed, the lower surface 2 a (or the upper surface 2 a) of the upper and lower surfaces 2 a and 2 a that are the long sides of the element portion 2 is in contact with the wall surface 9. In the case of such a wiring form, the bending radius R of the optical fiber core wire 5 decreases as the corner bending radius R1 decreases, and the transmission loss of the optical fiber core wire 5 increases. However, in this embodiment, since the element portion 2 is floated from the wall surface 9, the bending radius R of the optical fiber core wire 5 can be increased by the amount of the floating portion, and is affected by the bending radius R of the corner portion. It becomes difficult.

  In the optical fiber cable 101 of the second embodiment, the bending radius R of the optical fiber core wire 5 is larger than the bending radius R1 of the corner portion in both cases of the exit corner and the entrance corner. The optical fiber cable 101 is not hooked when carrying a part or an object such as a foot, and the aesthetic appearance is not impaired because it does not protrude greatly.

  For example, in the optical fiber cable 1 of the first embodiment in which the neck 4 is continuously formed, the optical fiber cable of the second embodiment in which the neck 4 is discontinuous by separating the neck 4 at a portion corresponding to the corner. The same effect as 101 can be obtained. That is, in order to route the optical fiber cable 101 at the corner, the neck 4 corresponding to the corner is cut off. If such a wiring method is employed, the bending radius R of the optical fiber core wire 5 can be made larger than the bending radius R1 of the corner portion even in the optical fiber cable 101 in which the neck 4 is continuous.

“Third Embodiment”
FIG. 8 is a cross-sectional view in which an optical fiber cable is wired on a wall surface having a protruding corner when the element portion has a surplus length with respect to the entire length of the optical fiber cable, and (A) is an example of an appropriate surplus length. (B) is an example in which the surplus length is too long, FIG. 9 is a cross-sectional view in which the optical fiber cable is wired on the wall surface having the corner when the element portion has a surplus length with respect to the total length of the optical fiber cable. (A) is an example of an appropriate surplus length, (B) is an example where the surplus length is short, and (C) is an example where the surplus length is too long.

  In the optical fiber cable 102 of the third embodiment, the total length of the element portion 2 is longer than the total length of the optical fiber cable 102 with respect to the optical fiber cable 101 of the second embodiment. For example, when considering between the front and rear neck portions 4 and 4 in the cable length direction A, the length of the element portion 2 between the neck portions 4 and 4 is longer than the linear distance L between the front and rear neck portions 4 and 4. .

  When the total length of the element portion 2 is made longer than the total length of the optical fiber cable 102 and has a surplus length, if the surplus length is appropriate, as shown in FIG. The bending radius R is larger than the corner bending radius R1. The bending radius R of the optical fiber core wire 5 is maximized when the curved line drawn by the element portion 2 contacts the corner portion at one point (however, the vertical drag received from the corner portion of the element portion 2 is zero). is there. If the remaining length is longer than this, the bending radius R of the optical fiber core wire 5 is conversely reduced as shown in FIG. 8B, and the element portion 2 jumps out of the element support portion 3. . For this reason, there is a risk of being caught on the element portion 2 when carrying parts or objects such as human hands and feet, and the aesthetics are also impaired.

  When the optical fiber cable 102 is wired on the wall surface 9 having a corner, if the extra length is appropriate, the bending radius R of the optical fiber core wire 5 is equal to the corner portion as shown in FIG. It becomes larger than the bending radius R1. With this optimum extra length, the element part 2 contacts the wall surface 9 at two points at the corners. On the other hand, when the extra length is short, the element part 2 jumps out of the element support part 3 as shown in FIG. 9B. When the surplus length is too long, as shown in FIG. 9C, the bending radius R of the optical fiber core wire 5 is smaller than the bending radius R1 of the corner portion, and the element portion 2 is outside the element support portion 3. Jump out to the big.

  An optical fiber cable with extra length on the wall with exit and entry corners was routed, and the bending relaxation effect on the extra length ratio (((element part-total cable length) / total cable length) x 100%) was investigated. . As a verification, the bending radius R of the optical fiber core wire is 10 mm or less, particularly ITU-T G. The 657 B3 standard requires a loss increase when the bending radius R is 5.0 mm. Therefore, the design of general doors, sashes, and the like that are considered to have the most severe bending radius R in wiring in a home is 2 mm. It verified in. In the verification, the width of the gap in the sash or the like is about 2 mm. Therefore, the height of the element support portion is 1.6 mm, the height of the element portion is 1.0 mm, and the major axis is 2.0 mm. Yes.

When the bending radius R of the optical fiber core is 2.0 mm, the bending is relaxed and the element portion does not protrude outward than the element support portion, the bending is relaxed, but the element portion is more than the element support portion. It is evaluated as Δ when it jumps out to the outside, and x when the element part jumps out of the element support part without bending being relaxed. The results are shown in Table 1.

  When the result of Table 1 was seen, in the minus surplus length, since the element part was extended in the extended corner and pressed against the corner part of the wall surface, it was x. In the case where the extra length ratio of the element portion is 0 to 1.0%, it is possible to expect a bending relaxation effect while keeping the aesthetic appearance. Thereby, the distortion applied to the optical fiber core wire is reduced, and it is possible to suppress the decrease in the increase in transmission loss at the time of the minimum bending radius and the decrease in the fracture life of the optical fiber core wire. In addition, when the neck portion is present at a position in contact with the corner portion, the degree of freedom of the element portion is lost, and the effect of relaxing the bending cannot be sufficiently obtained, but sufficient freedom is obtained by cutting the neck portion. Can be obtained, and bending is relieved.

  Although specific embodiments to which the present invention is applied have been described above, the present invention is not limited to the above-described embodiments. For example, in FIG. 2, the element support portion 3 has a vertically long rectangular cross section perpendicular to the cable length direction A. However, the element support portion 3 may have a horizontally long rectangular shape as shown in FIG. . If the element support part 3 is a horizontally long rectangular shape, the cable wiring surface 3a in contact with the wall surface 9 is wider than the element support part 3 having a vertically long rectangular shape. When used, stable fixation can be realized by widening the bonding surface. FIG. 11 is the same as the optical fiber cable of FIG. 2 except that the shape of the element support portion 3 is different. In addition, the element support portion 3 may be square, triangular, or trapezoidal.

  INDUSTRIAL APPLICATION This invention can be utilized for the optical fiber cable suitable for wiring on the wall surface containing a corner | angular part.

DESCRIPTION OF SYMBOLS 1, 101,102 ... Optical fiber cable 2 ... Element part 3 ... Element support part 4 ... Neck part 5 ... Optical fiber core wire 6, 10 ... Strength body 7 ... Outer cover 8 ... Notch groove 9 ... Wall surface

Claims (6)

An element part formed by coating an optical fiber core wire and a tensile body with a jacket;
Supporting two elements having two cable wiring surfaces in contact with the wall surface, wherein the thickness of the element portion in the cable thickness direction perpendicular to the cable length direction is larger than that of the element portion and arranged on both sides of the element portion And
A neck portion that connects the element portion and the element support portion continuously or discontinuously in the cable length direction so as to support the element portion upward from the cable wiring surfaces in the air. An optical fiber cable. The optical fiber cable according to claim 1,
An optical fiber cable, wherein another tensile strength member is provided on the two element support portions on the same line as the optical fiber core wire and the tensile strength member provided on the element portion. An optical fiber cable according to claim 1 or claim 2,
The optical fiber cable, wherein the neck portion can be separated from the element support portion at the time of cable wiring to the wall surface. An optical fiber cable according to any one of claims 1 to 3,
The element portion has an extra length of 0 to 1% with respect to the total length of the optical fiber cable. An optical fiber cable according to any one of claims 1 to 4,
An optical fiber cable, wherein a notch groove for taking out the optical fiber core wire is formed in the element portion along a cable length direction. An optical fiber cable wiring method for wiring the optical fiber cable according to any one of claims 1 to 5 along a wall surface,
A method of wiring an optical fiber cable, wherein the optical fiber cable is routed by cutting off the neck at a portion corresponding to a corner of the wall surface.

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