JP4458689B2 - Fiber optic cable - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical fiber cable capable of accommodating an optical fiber with a small diameter and high density.
[0002]
[Prior art]
As an optical fiber cable for storing a large number of optical fibers in a thin cable, (1) Japanese Patent Laid-Open No. 3-172808, (2) Japanese Patent Laid-Open No. 4-143710, (3) Japanese Patent Laid-Open No. 8-240752, etc. Is disclosed.
[0003]
The optical fiber cables disclosed therein use a spacer in which at least one spiral groove (hereinafter referred to as a slot) is formed on the surface of a long cylindrical rod made of a plastic material. A large number of tape-shaped optical fiber cores are stacked and stored.
[0004]
The above cable requires a process of forming at least one spiral groove (hereinafter referred to as a slot) on the surface of a long cylindrical rod made of a plastic material. It is also disadvantageous.
[0005]
Further, when a plurality of laminated tape-shaped optical fiber cores are mounted in the slot, there arises a technical problem that the distortion of the optical fiber core wires becomes large and good characteristics of the cable cannot be obtained.
[0006]
[Problems to be solved by the invention]
The present invention has been made to solve the above-described problems, and is an optical device capable of storing an optical fiber ribbon at a high density without using a long cylindrical spacer having a spiral groove formed on the surface. To provide a fiber cable.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is an optical fiber cable , wherein a fiber ribbon laminated body in which a plurality of fiber ribbons each having an optical fiber core wire formed in a tape shape are laminated, and along a longitudinal direction of the fiber ribbon laminated body. A cable unit in which four protective tapes vertically attached to the periphery thereof are twisted in one direction or SZ direction, a protective sheath coated on the outside of the cable unit, the cable unit, and the protective sheath A tension member attached between the cable unit and the cable unit, the cross section in a direction perpendicular to the longitudinal direction of the fiber ribbon laminate is formed in a rectangular shape, and the protective tape is formed of the fiber ribbon laminate. upper surface of the body, bottom, are served longitudinally disposed respectively a slight clearance on both sides, between each protective tape, the length of the fiber ribbon stack Characterized in that it has an opening along the direction.
[0009]
According to a second aspect of the present invention, there is provided an optical fiber cable, a fiber ribbon laminated body in which a plurality of fiber ribbons each having an optical fiber core wire formed in a tape shape are laminated, and along a longitudinal direction of the fiber ribbon laminated body. A cable unit in which two protective tapes vertically attached to the periphery thereof are twisted in one direction or SZ direction, a protective sheath coated on the outside of the cable unit, the cable unit, and the protective sheath A tension member attached between the cable unit and the cable unit, the cross section in a direction perpendicular to the longitudinal direction of the fiber ribbon laminate is formed in a rectangular shape, and the upper surface of the fiber ribbon laminate and one side is bent one of the protective tape is covered by providing a slight gap, the bottom and the other side of the fiber ribbon stack and the other Covered by providing a slight clearance by bending the protective tape, and characterized in that it has an opening along the longitudinal direction of the fiber ribbon stack between said one of the protective tape and the other protective tape To do.
[0010]
According to a third aspect of the present invention, there is provided an optical fiber cable, a fiber ribbon laminate in which a plurality of fiber ribbons each having an optical fiber core wire formed in a tape shape are laminated, and along a longitudinal direction of the fiber ribbon laminate. A cable unit in which two protective tapes vertically attached to the periphery thereof are twisted in one direction or SZ direction, a protective sheath coated on the outside of the cable unit, the cable unit, and the protective sheath A tension member attached between the cable unit and the cable unit, the cross section in a direction perpendicular to the longitudinal direction of the fiber ribbon laminate is formed in a rectangular shape, and the bottom surface of the fiber ribbon laminate and both side surfaces are covered with one of the protective tape is provided a slight clearance bent in a U-shape, the upper surface and the other of the protective tape of the fiber ribbon stack In covered is provided a slight gap, characterized in that it has an opening along the longitudinal direction of the fiber ribbon stack between said one of the protective tape and the other of the protective tape.
[0011]
According to a fourth aspect of the present invention, in the optical fiber cable according to any one of the first to third aspects, a pair of lip cords are provided between the cable unit and the protective sheath. It is characterized by that. According to a fifth aspect of the present invention, in the optical fiber cable according to any one of the first to fourth aspects, the protective tape includes a hot-melt coating layer on an outer surface of the base material, and the hot tape A melt type coating layer is heat-sealed to the protective sheath. A sixth aspect of the present invention is the optical fiber cable according to any one of the first to fifth aspects, wherein the protective tape is provided with a water absorbing layer on the inner surface of the base material. And The invention according to claim 7 is characterized in that a plurality of optical fiber cables according to any one of claims 1 to 6 are assembled.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an example of an optical fiber cable according to the present invention, in the longitudinal direction of a fiber ribbon laminate 2 in which a plurality of fiber ribbons 1 in which a plurality of optical fiber cores are formed in a tape shape are laminated. Four protective tapes 3 are vertically attached to surround the periphery, that is, the upper surface, the bottom surface, and both sides. In this case, the fiber ribbon laminate 2 and the protective tape 3 are vertically attached so as to form a slight gap.
[0013]
2 and 3, the vertical structure of the protective tape 3 covers the top surface and one side surface of the fiber ribbon laminate 2 by folding a single protective tape and covering the bottom surface and the other side surface. The other protective tape is folded and covered, and a total of two are attached vertically, or one protective tape is fed into the molding machine, forming a U-shaped tray as a whole, and laminating fiber ribbons in it It is also possible to place the body 2 and install the other protective tape as a lid on the body 2.
[0014]
As shown in FIG. 4, the protective tape 3 has a tape-like base material 31, for example, an aluminum tape, a polyester tape, a synthetic paper tape, etc., and a heat sensitive material provided on one surface of the base material 31. Adhesive resin layer, in other words, hot-melt coating layer 32, such as PE, EVA, Surlyn, and the like, and a water absorbing layer 33 provided on the other surface of the substrate 31, such as a porous hollow fiber layer, polyester fiber and nylon fiber, It has a three-layer structure such as a mixed woven fabric or a non-woven fabric.
[0015]
Note that the hot-melt coating layer 32 can be omitted if heat sealing between the protective tape 3 and the protective sheath 5 of the cable to be described later is not preferred.
[0016]
The fiber ribbon laminate 2 and the protective tape 3 covering the periphery thereof are vertically attached as follows. That is, when the individual fiber ribbons 1 are individually laminated in parallel or in advance on the fiber ribbon laminate 2 and are continuously guided along with the protective tape 3 to the former (former), the protective tape 3 is formed into the former. The cable core 4 is manufactured so as to cover the periphery of the fiber ribbon laminate 2 by sequentially changing the shape along the inner wall of the fiber ribbon.
[0017]
The cable core 4 manufactured in this way is guided to an extrusion molding machine together with the tension member 6, and a thermoplastic sheath such as polyethylene or vinyl chloride is extruded and coated on the outside of the cable core 4 to form a protective sheath 5. An optical fiber cable is configured.
[0018]
When manufacturing the cable, the fiber ribbon or fiber ribbon laminate feeding device is configured so that the cable core itself is twisted by reversing it in the SZ direction in one direction or left and right alternately about the axis of the cable. Is done.
[0019]
Further, if a pair of lip cords 6, for example, high-strength fiber strings are continuously embedded in the longitudinal direction of the cable core 4 in the vicinity of the joint of the protective tape 3 covering the cable core 4, protection is performed as necessary. It is convenient for tearing the sheath 5 to expose the inner fiber ribbon 1.
[0020]
Furthermore, a plurality of cables according to the above embodiments can be assembled to form another optical fiber cable.
[0021]
【The invention's effect】
As described above, according to the present invention, since a spacer having at least one spiral groove formed on the surface for housing the fiber ribbon is not necessary, it is easy to manufacture the optical fiber cable core and thus the optical fiber cable. It is also advantageous from the viewpoint of cost.
[0022]
Furthermore, since the tape-shaped optical fiber cores laminated in large numbers are not mounted in the slot, the distortion of the optical fiber core wire is reduced and good characteristics can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of the present invention. FIG. 2 is a perspective view showing another example of a cable core used in the invention. FIG. 3 is another example of a cable core used in the invention. FIG. 4 is a cross-sectional view showing an example of a protective tape used in the present invention.
1 --- Fiber ribbon 2 --- Fiber ribbon laminate 3 --- Protective tape 4 --- Cable unit 5 --- Protective sheath 6 --- Tension member 7 --- Rip cord

Claims (7)

A fiber ribbon laminate in which a plurality of fiber ribbons each having an optical fiber core formed in a tape shape are laminated, and four protective tapes vertically attached to the periphery of the fiber ribbon laminate along the longitudinal direction thereof. A cable unit twisted in the direction or SZ direction;
A protective sheath coated on the outside of the cable unit;
A tension member attached between the cable unit and the protective sheath;
With
The cable unit is
A cross section in a direction perpendicular to the longitudinal direction of the fiber ribbon laminate is formed in a rectangular shape,
The protective tape is vertically attached with a slight gap on each of the top, bottom and both sides of the fiber ribbon laminate,
An optical fiber cable having an opening along the longitudinal direction of the fiber ribbon laminate between the protective tapes. A fiber ribbon laminate in which a plurality of fiber ribbons in which optical fiber cores are formed in a tape shape is laminated, and two protective tapes vertically attached to the periphery along the longitudinal direction of the fiber ribbon laminate. A cable unit twisted in the direction or SZ direction;
A protective sheath coated on the outside of the cable unit;
A tension member attached between the cable unit and the protective sheath;
With
The cable unit is
A cross section in a direction perpendicular to the longitudinal direction of the fiber ribbon laminate is formed in a rectangular shape,
The upper surface and one side surface of the fiber ribbon laminated body are covered with a small gap by bending one protective tape, and the bottom surface and the other side surface of the fiber ribbon laminated body are slightly bent by bending the other protective tape. Covered with a gap ,
An optical fiber cable having an opening along a longitudinal direction of the fiber ribbon laminate between the one protective tape and the other protective tape. A fiber ribbon laminate in which a plurality of fiber ribbons in which optical fiber cores are formed in a tape shape is laminated, and two protective tapes vertically attached to the periphery along the longitudinal direction of the fiber ribbon laminate. A cable unit twisted in the direction or SZ direction;
A protective sheath coated on the outside of the cable unit;
A tension member attached between the cable unit and the protective sheath;
With
The cable unit is
A cross section in a direction perpendicular to the longitudinal direction of the fiber ribbon laminate is formed in a rectangular shape,
The bottom surface and both side surfaces of the fiber ribbon laminate are covered with a small gap by bending one protective tape into a U shape, and the top surface of the fiber ribbon laminate is provided with a small gap with the other protective tape. covered Te,
An optical fiber cable having an opening along a longitudinal direction of the fiber ribbon laminate between the one protective tape and the other protective tape. An optical fiber cable according to any one of claims 1 to 3 ,
An optical fiber cable, wherein a pair of lip cords are provided between the cable unit and the protective sheath. An optical fiber cable according to any one of claims 1 to 4 ,
The protective tape comprises a hot-melt type coating layer on the outer surface of the base material, and the hot-melt type coating layer is heat-sealed to the protective sheath. An optical fiber cable according to any one of claims 1 to 5 ,
The protective tape is an optical fiber cable characterized in that a water absorption layer is provided on the inner surface of the base material. An optical fiber cable comprising a plurality of optical fiber cables according to any one of claims 1 to 6 .

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