JP5165494B2 - Single core separation cable - Google Patents

Description

  The present invention relates to a single-core separation cable line used when a single-core separation optical fiber core branched from a tape core is connected to a pull-in single-core optical fiber.

  Since the single-core separated optical fiber branched from the tape core is extremely thin, it is easily damaged by excessive bending or the like, and a skillful technique is required for the pull-in connection work in the field.

Therefore, a single-core separation optical fiber group is exposed and derived from one end of the tape core, and a single-core separation cable in which the separation portion is surrounded by a protective tube made of resin is pre-manufactured and brought to the cable drawing work site. Connect the lead-out end of the tape core wire led out from one end of the protective tube to a predetermined tape core wire branched from the installed optical cable body using a known connection means, and lead out from the other end of the protection tube Means for connecting a predetermined single-core separated optical fiber of the group of single-core separated optical fibers to a pull-in single-core optical fiber has been proposed (for example, see Patent Document 1).
JP-A-10-227939

  When the single-core separation cable wire manufactured in advance as described above is used, the work of separating the single-core separation optical fiber core from the tape core is not required in the field, and the single-core separation optical fiber core separated from the tape core is not required. This is effective in facilitating the connection between the wire and the lead-in single-fiber optical fiber, but the single-core separated optical fiber group separated from the tape core wire has a matrix state of two columns and two rows. Therefore, the storage state of the separated core groups in the matrix arrangement state has no directionality, and it is difficult for the operator to distinguish between the separated core wires, and the workability is deteriorated.

  The present invention has been made paying attention to such a point, and further facilitates the connection work between the single-core separated optical fiber branched from the tape core and the pull-in single-core optical fiber. An object of the present invention is to provide a single-core separation cable line that can be used.

  In order to achieve the above object, the present invention is configured as follows.

1st invention is a single core separation | isolation cable wire which has the single core isolation | separation optical fiber core wire branched from the one end part of the tape core wire which bundled the several optical fiber core wire,
An outer layer tube through which one end of the tape core, a base end side portion of the single-fiber separation optical fiber group, and a branch portion between the one end and the base end portion are inserted;
A reinforcing member housed in the outer tube along the one end portion, the base end side portion, and the branch portion;
An inner layer resin body that is filled in the outer layer tube and holds the one end portion, the base end side portion, and the branch portion;
With
Forming the inward holding surface of the reinforcing member into a flat surface or a substantially flat surface;
After arranging the single-core separated optical fiber core group in a line, the single-core separated optical fiber group is arranged in a state where the arrangement is along the inward holding surface ,
The inward holding surface is deviated from the axial center of the outer layer tube on the outer peripheral surface side of the reinforcing member and in a direction in which the size of the outer peripheral surface decreases,
Forming the outer peripheral surface of the reinforcing member into a convex curved surface;
Forming the outer peripheral surface into an arc surface;
The arc center angle of the outer peripheral surface is 72 to 175 degrees.

  According to this configuration, a single-core separation cable wire manufactured in advance is brought into the cable drawing work site, and the lead-out end of the tape core wire led out from one end of the single-core separation cable wire is branched off from the installed optical cable body. Connected to a predetermined tape core using a well-known connecting means, and for pulling a predetermined single-core separated optical fiber from a group of single-core separated optical fibers led out from a single-core separated cable Connect to single fiber optical fiber.

  In this case, since the single-core separated optical fiber core group led out from the single-core separated cable line is arranged in a line, it is easy to identify each single-core separated optical fiber core from the parallel order, and a desired A single-core separated optical fiber core can be easily found and connected to a pull-in single-fiber optical fiber.

Further, according to this configuration, the inward holding surface is displaced from the axial center of the outer tube on the outer peripheral surface side of the reinforcing member and in a direction in which the size of the outer peripheral surface decreases . The maximum diameter part can be vacated as an arrangement space for one end of the tape core and the proximal end of the single-fiber separated optical fiber group, and the single-fiber separated optical fiber group arranged in a row It can be arranged without difficulty in the tube. In addition, it is possible to separate one end of the tape core and the base end side of the single-core separated optical fiber group from the inscribed circle of the outer tube, so the impact applied from the outside to these parts can be reduced. It becomes possible to make it.

Further, according to this configuration, since the outer peripheral surface of the reinforcing member is formed in a convex curved surface, it is possible to secure a large cross-sectional area of the reinforcing member and make the reinforcing member itself high in strength.

Moreover, according to this structure, since the outer peripheral surface of the reinforcement member is formed in the circular arc surface, the reinforcement member of desired cross-sectional shape can be easily manufactured by cutting a round bar raw material.

In addition, according to this configuration, since the central angle of the outer peripheral surface formed in an arc shape is 72 to 175 degrees, single-core separated optical fiber cores arranged in a line are arranged without difficulty in the outer tube. can do. In addition, it is possible to sufficiently separate one end of the tape core and the base end side of the single-core separated optical fiber group from the inscribed circle of the outer tube, so that an external impact is applied to these portions. Can be mitigated most.

According to a second invention, in the first invention,
A protective tube covering each of the single-core separated optical fibers is further provided. According to this configuration, the possibility of damaging the single-core separated optical fiber core group arranged in a line and led out from the outer tube is reduced and can be easily handled.

According to a third invention, in the second invention,
A depression step is formed at a portion of the inward holding surface facing the single-core separated optical fiber coated with the protective tube. According to this configuration, the single-core separation whose diameter has been increased by covering the protective tube by positioning the protective tube covered with the single-core separated optical fiber core wire at the depression step portion on the inward holding surface of the reinforcing member The optical fiber core wire can be deployed without bending.

4th invention is 2nd or 3rd invention,
An optical connection connector is provided at the lead-out end of the single-core separated optical fiber with a protective tube drawn from the outer layer tube.

  With this configuration, handling of the single-core separated optical fiber with a protective tube becomes easy, and the connection process between the single-core separated optical fiber and the pull-in single-core optical fiber can be performed easily and quickly. This is effective for shortening the time required for lead-in work.

  As described above, according to the present invention, it is possible to further facilitate the connecting operation between the single-core separated optical fiber branched from the tape core and the pull-in single-core optical fiber.

  Several embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment]
1 to 3 show a first embodiment of a single-core separation cable line A according to the present invention, FIG. 1 is a plan view, and FIG. 2 is a cross-sectional view taken along line aa in FIG. 3 is a cross-sectional view taken along line bb in FIG. The single-core separation cable A includes a tape core 1 having a predetermined length, an outer layer tube 2 through which the tape core 1 is inserted, a reinforcing member 3 inserted into the outer layer tube 2 over its entire length, And an inner layer resin body 4 filled in the outer layer tube 3.

  The tape core wire 1 is composed of, for example, a four-core tape core wire having a thickness of 0.3 to 0.4 mm and a width of 1.1 mm, which is formed by arranging four optical fiber core wires 5 in a row and integrally protecting them. The coating of the tape core wire 1 is removed inside the outer layer tube 2 to separate and expose a group of single-fiber separated optical fiber cores 5 consisting of four optical fiber core wires 5, and the separated optical fiber core wires 5 are separated. Is led out from one end of the outer tube 2. Therefore, the outer tube 2 includes one end of the tape core wire 1, a base end side portion of the single-core separated optical fiber core group 5, one end portion of the tape core fiber 1, and the single-core separated optical fiber core group 5. The branch portion between the base end portion and the base end side portion is inserted. The number of the optical fiber cores included in the tape core wire 1 is the number according to the optical fiber cable to be connected, such as 2, 5, 8, 12, 16, etc. It is not limited to a book or its size.

  The outer layer tube 2 is composed of a heat-shrinkable resin tube having an outer diameter of 3.0 to 4.5 mm, a thickness of about 0.5 mm, and a length L1 of 20 to 50 mm (preferably 40 mm). For example, in addition to being made of polyethylene that melts at a temperature of slightly over 100 ° C., it is possible to appropriately select from materials having conditions that exceed the melting / softening temperature of the inner layer resin body 4 such as polyolefin and vinyl chloride.

  The reinforcing member 3 has an arc shape whose outer peripheral surface is along the inner surface of the outer tube 2. The reinforcing member 3 has an inward holding surface s that faces the proximal end portion of the group of single-core separated optical fiber cores 5 and one end of the tape core wire 1, and the inward holding surface s is It is formed on a flat surface. The reinforcing member 3 is made of a hard material having an appropriate rigidity such as metal, plastic, or ceramic.

  The flat inward holding surface s functions as a holding surface that determines the arrangement posture of the proximal end portion of the group of single-core separated optical fiber cores 5 inserted through the outer tube 2 and one end of the tape core wire 1. The one end of the tape core wire 1 and the one end of the tape core wire 1 are parallel to the inward holding surface s so that the parallel direction of the one end portion of the tape core wire 1 and the base end side portion of the single fiber separation optical fiber group 5 group is parallel to the inward holding surface s. The proximal end side portion of the group 5 of core separation optical fiber core wires is disposed close to the inward holding surface s.

  The inner-layer resin body 4 functions as a hot-melt adhesive that holds the tape core wire 1 and the single-core separated optical fiber core group 5 inserted into the outer-layer tube 2 and melts at, for example, less than 100 degrees Celsius. EVA (ethylene vinyl acetate copolymer resin) is used. The inner layer resin body 4 is formed as follows, for example. That is, with the outer layer tube 2 inserted through the tape core wire 1, the single-core separated optical fiber core group 5 and the inner layer resin body 4 (pipe-like in the initial stage), this structure is slightly over 100 degrees Celsius. The inner layer resin body 4 is selectively melted once by heat treatment and then cooled. Thereby, the inner layer resin body 4 is filled in the outer layer tube 2 in a state where the inner gap of the outer layer tube 2 is filled.

  The single-fiber separation position P at which the single-core separation optical fiber core wire 5 is separated in the outer-layer tube 2 is the position of the outer-layer tube 2 in order to secure the holding length L2 of the single-core separation optical fiber core group 5. The length of the outer core tube 2 is displaced to the side where the tape core wire 1 is led out, and the length L1 of the outer tube 2 is 20 to 50 mm, while the separation core wire holding length L2 is 5 to 35 mm (preferably 30 mm) ), And the tape holding length L3 from the end of the outer tube is set to 5 to 35 mm (preferably 10 mm).

  The single-core separation cable line A according to the first embodiment is configured as described above, and the single-core separation cable line A manufactured in advance is brought into the cable drawing work site, and from one end of the single-core separation cable line A. The lead-out end of the tape core wire 1 that has been led out is optically connected to a predetermined tape core wire branched from the installed optical cable body using a known connection means, and from the other end of the single-core separation cable wire A. From the group of single-core separated optical fiber cores 5 derived from the above, a predetermined single-core separated optical fiber core wire 5 is optically connected to the pull-in single-core optical fiber. In such a connection operation, the single-core separated optical fiber cores 5 group led out from the single-core separated cable line A are arranged in a line, so that the single-core separated optical fiber cores 5 are arranged in the parallel order. The desired single-core separated optical fiber core wire 5 can be easily found and connected to the pull-in single-core optical fiber.

[Second Embodiment]
4 to 7 show a second embodiment of the single-core separation cable line A according to the present invention, FIG. 4 is a plan view, and FIG. 5 is a cross-sectional view taken along the line cc in FIG. 6 is a sectional view taken along the line dd in FIG. 4, and FIG. 7 is a sectional view taken along the line ee in FIG.

  The basic configuration in this embodiment is the same as that in the first embodiment described above, but each of the single-core separated optical fiber cores 5 separated in the outer layer tube 2 is protected by a protective tube 6 having an outer diameter of about 0.9 mm. And is led out from the end of the outer tube 2 as a single-core separated optical fiber 5 ′ with a protective tube.

  In this case, the tube holding length L4 for holding the single-core separated optical fiber core wire 5 'with the protective tube in the outer layer tube 2 is required to some extent, and the length L1 of the outer layer tube 2 is 20 to 50 mm. The wire holding length L2 is set to 10-30 mm (desirably 20 mm), the tape holding length L3 from the outer tube end is set to 5-15 mm (desirably 10 mm), and the tube holding length L4 is set to 5-15 mm (desirably 10 mm). To do.

  In this embodiment, the single-core separated optical fibers 5 'with protective tubes having large diameters are arranged in a line and require a large arrangement space, so that the inward holding surface s of the reinforcing member 3 is used. Is deviated from the center of the outer tube 2 toward the outer peripheral surface of the reinforcing member 3 and in the direction in which the size of the outer peripheral surface decreases. Thereby, the diameter site | part used as the maximum width site | part in the internal space of the outer layer tube 2 can be vacated. Further, in the case of the reinforcing member 3 having an arcuate outer peripheral surface, if the arc central angle θ of the outer peripheral surface is set to 72 to 175 degrees, the arrangement space of the single-core separated optical fiber cores 5 ′ with a protective tube is arranged. Can be secured sufficiently large. Therefore, the single-core separated optical fiber cores 5 arranged in a line can be arranged in the outer layer tube 2 without difficulty. Further, since one end of the tape core wire 1 and the base end side portion of the single-core separated optical fiber core group 5 can be separated from the inscribed circle of the outer tube 2, these portions are added from the outside. It is possible to reduce the impact.

[Third Embodiment]
FIG. 8 is a plan view of a third embodiment of the single-core separation cable line A according to the present invention. In the second embodiment described above, the single-core separation cable line A is configured by providing the optical connection connector 7 at the lead-out end portion of the single-core separation optical fiber core wire 5 ′ with a protective tube that has been led out. Thus, the operation of connecting the single-core separated optical fiber 5 'with the protective tube and the pull-in single-core optical fiber can be performed more easily.

  9 and 10 show a modification of the second embodiment or the third embodiment. In this example, an indentation step f is formed in a part of the inward holding surface s of the reinforcing member 3 that faces the single-core separated optical fiber 5 ′ with a protective tube, that is, in the range of the tube holding length L4. By dropping one end of the protective tube 6 into the drop step f, the single-fiber separation optical fiber core 5 ′ with the protective tube is made parallel to the inward holding surface s without bending the single-fiber separation optical fiber core wire 5. Deployment can be derived.

[Other Examples]
The present invention can also be implemented in the following forms.

  (1) As shown in FIG. 11, the cross-sectional shape of the outer tube 2 is elliptical or oval, the reinforcing member 3 is provided with a flat inward holding surface s, and the entire outer peripheral surface or outer peripheral corner is A heat treatment is performed after inserting the reinforcing member 3 and the single-core separated optical fiber core 5 'with a protective tube covered with the tubular inner layer resin body 4 into the curved flat cross-sectional shape and the reinforcing member 3 into the outer layer tube 2. The inner-layer resin body 4 is melted to fill the outer-layer tube 2, and the outer-layer tube 2 is thermally contracted, so that the flat single-core separation cable A can be manufactured.

  (2) The inward holding surface s of the reinforcing member 3 can hold the group of single-core separated optical fiber cores 5 (single-core separated optical fiber cores 5 ′ with a protective tube) facing each other in a predetermined posture. As long as it is a plane, it is not only a completely flat flat surface as in the above-described embodiments, but can also be implemented as a substantially flat surface that is slightly concavely curved or curved.

(3) The outer-layer tube 2 and the inner-layer resin body 4 do not have to be heat-shrinkable materials and heat-melting materials, but use room-temperature-shrinkable tubes (for example, ethylene / propylene rubber, silicon rubber) and room-temperature melting materials, respectively. Can do. As the room temperature melting material, self-melting elastomer, fluorine compound, butyl rubber, or the like can be used. When using a cold shrink tube,
The inner tube 2 is internally fitted and held with a support tube having a spiral shape or the like so as to extend the outer tube 2 and give strain, and then remove the support tube to release the strain.
・ Irradiate ultraviolet rays, infrared rays, or intense light.
Thus, the cold shrink tube can be shrunk.

It is a top view which shows the single core isolation | separation cable wire of 1st Embodiment. It is aa sectional drawing in FIG. It is bb sectional drawing in FIG. It is a top view which shows the single core isolation | separation cable line of 2nd Embodiment. It is cc sectional drawing in FIG. FIG. 6 is a sectional view taken along line dd in FIG. 4. It is ee sectional drawing in FIG. It is a top view which shows the single core isolation | separation cable line of 3rd Embodiment. It is a disassembled perspective view of the principal part which shows the modification of a 2nd example or a 3rd example. It is a vertical side view of the principal part which shows the modification of 2nd Embodiment or 3rd Embodiment. It is a vertical front view which shows the principal part in the middle of manufacture in another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tape core wire 2 Outer layer tube 3 Reinforcement member 4 Inner layer resin body 5 Single-core separation optical fiber core wire 5 'Single-core separation optical fiber core wire with a protection tube 6 Protection tube 7 Optical connection connector f Sinking step s Inward holding surface

Claims (4)

A single-core separated cable having a single-core separated optical fiber branched from one end of a tape bundle formed by bundling a plurality of optical fibers;
An outer layer tube through which one end of the tape core, a base end side portion of the single-fiber separation optical fiber group, and a branch portion between the one end and the base end portion are inserted;
A reinforcing member housed in the outer tube along the one end portion, the base end side portion, and the branch portion;
An inner layer resin body that is filled in the outer layer tube and holds the one end portion, the base end side portion, and the branch portion;
With
Forming the inward holding surface of the reinforcing member into a flat surface or a substantially flat surface;
After arranging the single-core separated optical fiber core group in a line, the single-core separated optical fiber group is arranged in a state where the arrangement is along the inward holding surface ,
The inward holding surface is deviated from the axial center of the outer layer tube on the outer peripheral surface side of the reinforcing member and in a direction in which the size of the outer peripheral surface decreases,
Forming the outer peripheral surface of the reinforcing member into a convex curved surface;
Forming the outer peripheral surface into an arc surface;
The arc center angle of the outer peripheral surface is 72 to 175 degrees.
A single-core separated cable line characterized by that. A protective tube covering each of the single-fiber separated optical fibers;
Further,
The single-core separation cable line according to claim 1 . A depression step is formed at a portion of the inward holding surface facing the single-core separated optical fiber coated with the protective tube,
3. The single-core separation cable line according to claim 2, wherein An optical connection connector is provided at the lead-out end of the single-fiber separation optical fiber drawn from the outer tube.
The single-core separated cable line according to claim 2 or 3,

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