JPH0555114U - Fiber optic cable - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to increase the number of optical fiber cores to be inserted into one optical fiber cable without increasing the outer diameter of the optical fiber cable. A spacer-type optical fiber cable in which an optical fiber core wire 4 is housed in a groove 2a of a spacer, and a cross-sectional shape in which the groove 2a of the spacer becomes wider toward the outside is formed into a trapezoidal shape. Characterize. [Effect] It is possible to insert more optical fiber cores of the optical fiber tape in the groove of the spacer than in the conventional case.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an optical fiber cable.

[0002]

[Prior Art]

 3 and 4 show conventional examples of slot type (spacer type) optical fiber cables. As shown in the figure, the optical fiber cable has a structure in which one or a plurality of optical fiber tape cores 1 having the same number of cores are stacked and inserted into the groove 2 of the spacer. In the figure, 3 is a spacer, 4 is an optical fiber core wire, and 5 is a tension member.

Further, in the case where it is necessary to increase the number of cores, a plurality of the above slot type optical fiber cables are twisted together as shown in FIG.

[0004]

[Problems to be solved by the device]

 In the above-mentioned prior art, the optical fiber cable shown in FIG. 3 can realize a maximum number of optical fiber cores of about 200, and in order to further increase the number of fibers, as shown in FIG. When multiple optical fiber cables are twisted together, there is a drawback that the outer diameter of the optical fiber cable increases.

The present invention has been made in view of the above points, and it is possible to increase the number of optical fiber cores to be inserted in one optical fiber cable without increasing the outer diameter of the optical fiber cable. The purpose is to provide an optical fiber cable that has been made possible.

[0006]

[Means for Solving the Problems]

 The purpose of the above is to form a trapezoidal cross-sectional shape in which the width of the spacer groove becomes wider toward the outside, and to increase the number of optical fiber strands of the optical fiber ribbon to be stored toward the outside. To be achieved.

[0007]

[Action]

 Since the above means is provided, it is possible to insert more optical fiber cores of the optical fiber tape cores in the groove of the spacer than in the conventional case.

[0008]

【Example】

 Next, the present invention will be specifically described with reference to examples.

Embodiment 1 FIGS. 1 and 2 show an embodiment of the present invention. Note that the same parts as those of the prior art are denoted by the same reference numerals, and the description thereof will be omitted. In this embodiment, the trapezoidal cross section is formed so that the groove 2a of the spacer becomes wider toward the outside. By doing so, it becomes possible to insert more optical fiber cores 4 of the optical fiber tape cores 1 into the groove 2a of the spacer than in the conventional case, and to increase the outer diameter of the optical fiber cable by one. It is possible to obtain an optical fiber cable capable of increasing the number of optical fiber cores to be inserted in the optical fiber cable.

That is, as shown in FIGS. 1 and 2 in which the cross section of the optical fiber cable is shown, the tension member 5 is at the center, and the optical fiber tape core wire 1 is accommodated around the tension member 5. There is a spacer 3 to be used. The groove 2a of this spacer can accommodate the optical fiber ribbons 1 having the number of the optical fiber ribbons 1 of the optical fiber ribbons 1 from the bottom to 2 cores, 4 cores, 6 cores ... In addition, the width of the groove 2a is expanded by 2D (D is the outer diameter of the optical fiber core wire) from the bottom so that the order of the inserted optical fiber tape core wire 1 is not disturbed. Then, in the groove 2a, the two-fiber tape core 1a, the four-core tape core 1b, the six-core tape core 1c ... ..

As described above, according to the present embodiment, the optical fiber cable can accommodate more optical fiber core wires in the groove of the spacer than in the conventional case, and the optical fiber cable can be provided without increasing the outer diameter of the optical fiber cable. It is possible to realize multiple cables.

[0012]

[Effect of the device]

 As described above, the present invention has a trapezoidal sectional shape in which the width of the spacer groove becomes wider toward the outside. Therefore, it is possible to insert more optical fiber cores of the optical fiber tape core into the groove of the spacer than in the past. As a result, it is possible to obtain an optical fiber cable capable of increasing the number of optical fiber cores inserted into one optical fiber cable without increasing the outer diameter of the optical fiber cable.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an embodiment of an optical fiber cable of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a vertical sectional side view of a conventional optical fiber cable.

FIG. 4 is an enlarged view of a main part of FIG.

FIG. 5 is a vertical sectional side view of a conventional multi-core optical fiber cable.

[Explanation of symbols]

 1 Optical Fiber Tape Core Wire 2a Spacer Groove 3 Spacer 4 Optical Fiber Core Wire

Claims (1)

[Scope of utility model registration request] 1. In a spacer type optical fiber cable in which a plurality of optical fiber ribbons are stacked and housed in a groove of a spacer, the cross-sectional shape in which the groove of the spacer becomes wider toward the outside has a trapezoidal shape. An optical fiber cable which is formed and whose width dimension is wider as the optical fiber ribbon core extends outward.