JP7818426B2 - Optical fiber wiring branching component and optical fiber wiring branching structure - Google Patents

Description

The present invention relates to an optical fiber wiring branching component and an optical fiber wiring branching structure.

For example, Patent Document 1 discloses a branching section that branches an optical fiber cable having a tension member and multiple optical fiber cores at its end, in which the end of the branching component is fitted over the end of the optical fiber cable, the tension member extending from the end of the optical fiber cable is inserted into a through-hole provided in the branching component, the optical fiber cores extending from the end of the optical fiber cable are housed in a groove provided in the branching component, the branching component and tension member are fixed with a first fixing member, and the end of the branching component and the end of the optical fiber cable are fixed with a second fixing member.

Japanese Patent Application Laid-Open No. 2003-295019

However, in the case of Patent Document 1, the tension member is fixed to the axial center of the branching component, which means that the optical fiber core and the tension member may rub against each other within the branching section, potentially resulting in damage.

The present invention was made in response to the above-mentioned problems, and aims to provide an optical fiber wiring branching component and an optical fiber wiring branching structure that allow the tension member and multiple optical fibers to branch without coming into contact with each other inside the branching component.

The first aspect of the invention is an optical fiber wiring branching component comprising: a tubular portion through which a tension member and multiple optical fibers are passed from one side to the other in the axial direction; and a branching portion provided at the other end of the tubular portion in the axial direction, in which tension member passing portions through which the tension members are passed and optical fiber passing portions through which the optical fibers are passed are arranged in a ring shape when viewed from the other side in the axial direction.

With this optical fiber wiring branching component, the tension member passing portion and optical fiber passing portion are arranged in a ring shape in the branching portion when viewed axially, so the tension member and multiple optical fibers do not come into contact with each other when passing them from one side to the other in the axial direction. Therefore, with this optical fiber wiring branching component, the tension member and multiple optical fibers can be prevented from rubbing against each other, reducing the possibility of damaging the optical fibers.

A second aspect of the invention is the optical fiber wiring branching component described in the first aspect, wherein the tension member passing portion and the optical fiber passing portion are arranged in an annular shape when viewed from the axial direction.

With this optical fiber wiring branching component, the tension member passing portion and optical fiber passing portion are arranged in a circular ring shape when viewed axially, which allows the radial size of the tubular portion and branching portion to be smaller than when the tension member passing portion and optical fiber passing portion are not arranged in a circular ring shape.

A third aspect of the invention is an optical fiber wiring branching structure comprising a single protective tube that houses all of a plurality of optical fibers, an optical cable main tube that houses a tension member arranged outside the protective tube, and the optical fiber wiring branching component described in the first or second aspect attached to the end of the optical cable main tube.

This optical fiber wiring branching structure uses an optical fiber wiring branching component that reduces the possibility of the optical fiber and tension member rubbing against each other, resulting in damage to the optical fiber. Therefore, even in a structure in which multiple optical fibers branch out from a single protective tube, the possibility of the tension member and multiple optical fibers rubbing against each other, resulting in damage to the optical fiber, can be reduced.

The present invention provides an optical fiber wiring branching component and an optical fiber wiring branching structure that allow branching without contact between the tension member and multiple optical fibers inside the branching component.

1A and 1B are diagrams illustrating an optical cable main pipe used in the description of the present disclosure, in which FIG. 1A is a front view of the optical cable main pipe, and FIG. 1B is a side view of the optical cable main pipe. 10A and 10B are longitudinal cross-sectional views illustrating a method of connecting a first cable fixing component of a branching component and an optical cable main tube according to the present disclosure. 3A and 3B are plan views illustrating a method of connecting a second cable fixing component of a branching component according to the present disclosure to an optical cable main tube, where FIG. 3A is a front view and FIG. 3B is a side view. 4A and 4B are plan views illustrating a method of connecting an optical fiber wiring branching component and an optical cable main tube according to the present disclosure, where FIG. 4A is a front view and FIG. 4B is a side view. 1 is a perspective view illustrating an optical fiber wiring branching structure using a branching component according to the present disclosure. 6A and 6B are plan views for explaining a conventional method of connecting an optical fiber wiring branching component to an optical cable main tube, with FIG. 6A being a front view and FIG. 6B being a side view. FIG. 10 is a perspective view illustrating a first modified example of a branching component according to the present disclosure. FIG. 10 is a side view illustrating a second modified example of a branching component according to the present disclosure.

An example of an embodiment of the present disclosure will now be described with reference to the drawings. Note that in each drawing, the same or equivalent components and parts are designated by the same reference numerals. Also, the dimensional proportions in the drawings have been exaggerated for the sake of explanation and may differ from the actual proportions.

In addition, in the following description, directions such as "upper," "lower," "left," and "right" refer to directions on the paper surface of the referenced drawings, and may differ from actual directions.

(Optical cable main pipe 70)
1A and 1B are diagrams illustrating an optical cable main pipe 70 used in the description of the present disclosure. As shown in Fig. 1A, the optical cable main pipe 70 used in the present disclosure houses a protection pipe 72 that houses an optical fiber bundle 74, a tension member 78, and a spacer 76.

The optical fiber bundle 74 is, for example, composed of multiple resin-coated optical fibers 75 bundled together.

The protective tube 72 is, for example, a flexible stainless steel tube with a diameter of 1.8 mm and a thickness of 0.2 mm, and is a component that protects the optical fiber 75 from damage when pressure or other stress is applied to the optical cable main tube 70.

The tension member 78 is, for example, a resin-coated steel wire that has the strength to withstand tensile loads and not easily deform under them. Therefore, when a tensile load is applied to the optical cable main pipe 70, it can withstand the tensile load, preventing damage to the entire optical cable main pipe 70.

The spacer 76 is a fibrous member that, when incorporated into the optical cable main pipe 70 together with the protective tube 72 and tension member 78, maintains the cross-sectional shape of the optical cable main pipe 70 (circular in this embodiment).

The optical cable main pipe 70 may have any structure, but as an example, the pipe body is formed by wrapping the protective pipe 72, spacer 76, and tension member 78 in nonwoven fabric, and then covering the nonwoven fabric with polyethylene.

The optical cable main tube 70 is connected to the optical fiber wiring branching component 10, which will be described next, with the optical fiber bundle 74 and tension member 78 exposed at the end 80 and the protective tube 72 remaining at a predetermined length.

(Optical fiber wiring branching component 10)
The optical fiber distribution branch component 10 according to the present disclosure has a three-part structure including a first cable fixing component 20, a second cable fixing component 30, and a branch component 50. The shape and function of each component will be described below along with the procedure for attaching the optical fiber distribution branch component 10 to the end of an optical cable main tube 70 to form the optical fiber distribution branch component 10.

(First cable fixing component 20)
As shown in FIG. 2 , the first cable fixing component 20 according to the present disclosure is a tubular body having a generally cylindrical general portion 22 and a connection portion 28, one end of which is configured as a second cable fixing component 30, which will be described later.

The inner diameter of the general section 22 is slightly larger than the outer diameter of the optical cable main tube 70, allowing the general section 22 to fit loosely into the optical cable main tube 70.

The general portion 22 also has a fastening portion 24 that connects the radial inside and outside of the general portion 22.

The connection portion 28 is, for example, a portion whose one end is reduced in diameter relative to the general portion 22 and extends outward, into which the first connection portion 42 of the second cable fixing component 30 (described below) is loosely fitted. The connection portion 28 also has a retaining portion 29 that connects the inside and outside of the connection portion 28 in the radial direction.

First, as shown in FIG. 2, the optical cable main tube 70 is inserted into the general portion 22 of the first cable fixing component 20 from one axial side A1. Note that adhesive is applied to the outer peripheral surface of the optical cable main tube 70 inserted into the general portion 22.

Then, with the stripped end 80 of the optical cable main tube 70 aligned with the end face 26 of the connection portion 28 of the first cable fixing component 20, a fastener F1, such as a screw, is inserted into the fastening portion 24.

The optical cable main pipe 70 and the first cable fixing component 20 are then fixed together by the fastener F1 and the adhesive on the outer surface of the optical cable main pipe 70.

In one example, the first cable fixing component 20 is formed by cutting metal, but this is not limiting and it may also be formed by processing hard resin using injection molding or other methods.

(Second cable fixing component 30)
As shown in FIG. 3 , the second cable fixation component 30 according to the present disclosure includes a partition portion 32 , a first connecting portion 42 , and a second connecting portion 44 .

As shown in Figure 3(A), the partition section 32 has a through hole 34 and multiple through holes 36.

As shown in Figure 3(B), the through hole 34 is connected at the radial center from one side A1 to the other side A2 in the axial direction.

As shown in Figure 3 (B), the through holes 36 are radially outward of the through holes 34, concentrically communicating from one axial side A1 to the other axial side A2. A protective tube 72 is inserted into the through holes 36 from one axial side A1. Furthermore, a tension member 78 is inserted into the through hole 36 on the opposite side of the through hole 34 from the through hole 36 through which the protective tube 72 is inserted, from one axial side A1.

As shown in FIG. 3(A), multiple through holes 36 are formed in the partition section 32, but the number of through holes 36 through which the protective tubes 72 are inserted is the same as the number of protective tubes 72 housed in the optical cable main tube 70. In other words, one protective tube 72 is inserted into one through hole 36. When there is one protective tube 72, as in this embodiment, one through hole 36 is used. When there are multiple protective tubes 72, multiple through holes 36 are used.

When the number of through holes 36 and the number of protective tubes 72 are the same, the tension members 78 are inserted through the through holes 34.

In addition, each through hole 36 has a fastening portion 40 that connects the inside and outside radially.

The first connection portion 42 is the portion to which the first cable fixing component 20 is connected on one axial side A1 of the partition portion 32. Its inner diameter is slightly larger than that of the connection portion 28 of the first cable fixing component 20, and it fits into the connection portion 28.

The first connection portion 42 also has a fastening portion 41 that connects the inside and outside in the radial direction. Note that, when the connection portion 28 of the first cable fixing component 20 and the first connection portion 42 are mated as described below, the fastening portion 41 is positioned in the axial direction to match the swivel fastening portion 29 of the connection portion 28.

The second connection portion 44 is the portion where the branching part 50 is connected to the other axial side A2 of the partition portion 32. As an example, the other side A2 extends from the partition portion 32 with a reduced diameter.

In one example, the second cable fixing component 30 is formed by cutting metal, but this is not limiting and it may also be formed by processing hard resin using injection molding or other methods.

Also, as shown in Figure 3 (B), the protective tube 72 and tension member 78 exposed from the optical cable main tube 70 to which the first cable fixing component 20 is fixed are inserted into the through-hole 36 of the second cable fixing component 30.

Furthermore, with the tension member 78 and the protective tube 72 inserted into the through-holes 36, the connection portion 28 of the first cable fixing component 20 is fitted into the first connection portion 42.

Then, with the connection portion 28 of the first cable fixing component 20 and the first connection portion 42 engaged, a fastener F2, such as a screw, is inserted into the fastening portion 41 of the first connection portion 42.

As described above, the axial positions of the retaining portion 29 of the first cable fixing component 20 and the retaining portion 41 of the first connecting portion 42 are aligned, so the fastener F2 is inserted from the outside of the first connecting portion 42 up to the retaining portion 29.

In this way, the second cable fixing component 30 and the first cable fixing component 20 are fixed axially and radially by the fastener F2.

In addition, the tension member 78 and protective tube 72 are fixed in place at the fastening portion 40 from the radial outside of the partition portion 32 using fasteners F3, such as screws.

Next, with reference to Figures 4 and 5, we will explain the branching component 50, which corresponds to the optical fiber wiring branching component 10 in this embodiment. Note that Figure 5 does not show fastening portion 60 and fastening portion 63, which will be described later.

(Branch component 50)
As shown in FIG. 4 , the branching component 50 according to the present disclosure has a tube portion 58 having an approximately cylindrical shape, a connection portion 62 to which the second cable fixing component 30 is connected on one axial side A1 of the tube portion 58, and a branching portion 52 that branches off the tension member 78 and the optical fiber 75 of the optical fiber bundle 74 on the other axial side A2 of the tube portion 58.

The connection portion 62 is the portion to which the second connection portion 44 of the second cable fixing component 30 is connected. It is slightly larger than the second connection portion 44 of the second cable fixing component 30 and fits into the second connection portion 44.

The connection portion 62 also has a fastening portion 61 that connects the inside and outside radially.

The tubular portion 58 is a hollow cylinder through which the tension member 78 and optical fiber bundle 74 are passed through the through hole 36 of the second cable fixing component 30 toward the other axial side A2 of the branching portion 52, which will be described later.

As shown in Figure 4 (B), the branch section 52 has a tension member passing section 56 through which the tension member 78 passes from one axial side A1 to the other axial side A2, and an optical fiber passing section 54 through which each of the optical fibers 75 of the optical fiber bundle 74 passes from one axial side A1 to the other axial side A2.

In this description, the tension member passage portion 56 is a circular hole that connects from one side A1 of the branch portion 52 to the other side A2, and has a fastening portion 63 that connects the inside and outside of the branch portion 52 in the radial direction.

Furthermore, each of the optical fiber threading sections 54 in this description is a circular hole that connects from one side A1 of the branching section 52 to the other side A2, and has a fastening section 60 that connects the inside and outside of the branching section 52 in the radial direction.

Here, the tension member threading portion 56 and the optical fiber threading portion 54 according to the present disclosure are each formed concentrically from the radial center of the branch portion 52, as shown in Figure 4(A).

In other words, the tension member passing portion 56 and the optical fiber passing portion 54 according to the present disclosure are formed in a circular arrangement in the branch portion 52.

In this disclosure, "annular" refers to an arrangement shape in which, when the positions of the tension member-passing portion 56 and the optical fiber-passing portion 54 are considered as the vertices of a polygon when the branch portion 52 is viewed axially, the size of the interior angle of each vertex is 180° or less.

In one example, the branching component 50 is formed by cutting metal, but this is not limiting and it may also be formed by processing hard resin using injection molding or other methods.

Furthermore, in the branching component 50 according to the present disclosure, as shown in Figures 4(B) and 5, the optical fiber 75 is inserted from the through hole 36 of the second cable fixing component 30 through each of the optical fiber passing portions 54 of the branching section 52 and then through to the other axial side A2 of the branching component 50.

Here, in the branch component 50 according to the present disclosure, as shown in Figures 4(B) and 5, the tension member 78 is inserted through the tension member insertion portion 56 of the branch section 52 from the through hole 36 on the opposite side of the through hole 34 to the through hole 36 through which the protective tube 72 of the second cable fixing component 30 is inserted, and is then passed through to the other axial side A2 of the branch component 50.

Furthermore, with the tension member 78 and the optical fiber 75 inserted through the tension member passing portion 56 and the optical fiber passing portion 54, respectively, the second connection portion 44 of the second cable fixing component 30 is fitted into the connection portion 62 of the branching component 50.

Then, with the second connection portion 44 of the second cable fixing component 30 and the connection portion 62 of the branching component 50 engaged, a fastener F4, such as a screw, is inserted into the fastening portion 61, thereby fixing the branching component 50 and the second cable fixing component 30 together.

In this state, another tubular connecting part (not shown) is inserted from the other axial side A2 into the tension member passing portion 56 and optical fiber passing portion 54 of the branching portion 52, respectively, with the tension member 78 and optical fiber 75 housed inside.

Then, each of the other connection components is inserted into the tension member passing portion 56 and the optical fiber passing portion 54, and then secured to the tension member passing portion 56 and the optical fiber passing portion 54 from the outside of the tension member passing portion 56 and the optical fiber passing portion 54 using fasteners F6, such as screws, and F5, such as screws.

In this way, an optical fiber wiring branching structure 90 is obtained by combining the optical fiber wiring branching component 10 according to the present disclosure with the optical cable main tube 70.

(Conventional optical fiber wiring branching component 110)
6 shows a conventional optical fiber distribution branching component 110. Note that among the components of the conventional optical fiber distribution branching component 110, those components that are the same as those of the optical fiber distribution branching component 10 according to the present disclosure are given the same reference numerals plus 100, and detailed descriptions thereof will be omitted.

As shown in Figures 6(A) and 6(B), in a conventional optical fiber wiring branching component 110, a tension member passing portion 156 is provided in the radial center of the branching portion 152.

In this case, each optical fiber 75 is inserted from one axial side A1 to the other axial side A2 through the through hole 36 in the second cable fixing component 30, in other words, at a position radially offset from the radial center of the partition portion 32 of the second cable fixing component 30, to the optical fiber passing portion 154 of the branching portion 152, in other words, at a position radially offset from the radial center of the branching portion 152.

In this case, the tension member 78 is inserted from the through-hole 36 on the opposite side of the through-hole 34 to the through-hole 36 through which the protective tube 72 of the second cable fixing component 30 is inserted, through the tension member insertion portion 156 of the branch portion 152, in other words, at the radial center of the branch portion 152, from one axial side A1 to the other axial side A2.

That is, as shown in Figure 6(B), the optical fiber 75 is passed through the inside of the cylindrical portion 158 of the branching component 150 from the through hole 36 to the optical fiber passing portion 154, to a position spaced a maximum of 180° apart in the circumferential direction.

In contrast, as shown in Figure 6 (B), the tension member 78 is passed through the through hole 36 on the opposite side of the through hole 34, through which the protective tube 72 is inserted, inside the cylindrical portion 158 of the branching part 150, into the tension member passing portion 156, to a position that is radially centered.

Therefore, in the conventional optical fiber wiring branching component 110, the tension member 78 and the optical fiber 75 may be in contact with each other when passing through the inside of the tubular portion 158 of the branching component 150.

As a result, in the conventional optical fiber wiring branching component 110, the tension member 78 and the optical fiber 75 could come into contact inside the cylindrical portion 158 of the branching component 150, potentially damaging the optical fiber 75.

(Action and effect)
Here, the optical fiber wiring branch component 10 according to the present disclosure comprises a branch component 50, a tubular portion 58 through which a tension member 78 and a plurality of optical fibers 75 are passed from one axial side A1 to the other axial side A2, and a branch portion 52 provided at the end of the other axial side A2 of the tubular portion 58, in which a tension member passing portion 56 through which the tension member 78 is passed and an optical fiber passing portion 54 through which the optical fiber 75 is passed are arranged in a ring shape when viewed from the other axial side A2.

As a result, with the optical fiber wiring branching component 10 according to the present disclosure, as shown in Figures 4(B) and 5, the tension member passing portion 56 and the optical fiber passing portion 54 are arranged in a ring shape in the branching portion 52 when viewed axially, so the tension member 78 and the multiple optical fibers 75 do not come into contact with each other when passing them from one side A1 to the other side A2 in the axial direction.

Therefore, the optical fiber wiring branching component 10 according to the present disclosure can reduce the possibility of the tension member 78 and the multiple optical fibers 75 rubbing against each other, thereby damaging the optical fibers 75.

Furthermore, in the optical fiber wiring branch component 10 according to the present disclosure, the tension member passing portion 56 and the optical fiber passing portion 54 are arranged in a circular ring shape when viewed in the axial direction.

As a result, with the optical fiber wiring branching component 10 according to the present disclosure, the tension member passing portion 56 and the optical fiber passing portion 54 are arranged in a circular ring shape when viewed axially, which allows the radial size of the tubular portion 58 and the branching portion 52 to be smaller than when the tension member passing portion 56 and the optical fiber passing portion 54 are not arranged in a circular ring shape.

Therefore, with this optical fiber wiring branching component 10, the radial size can be reduced when viewed from the axial direction compared to when the tension member passing portion 56 and the optical fiber passing portion 54 are not arranged in a circular ring shape.

The optical fiber wiring branching structure 90 according to the present disclosure also includes a single protective tube 72 that houses all of the multiple optical fibers 75, an optical cable main tube 70 that houses a tension member 78 arranged outside the protective tube 72, and an optical fiber wiring branching component 10 according to the first or second aspect attached to the end 80 of the optical cable main tube 70.

As a result, the optical fiber wiring branching structure 90 according to the present disclosure uses an optical fiber wiring branching component 10 that can reduce the possibility of the optical fiber 75 and tension member 78 rubbing against each other and damaging the optical fiber 75.

Therefore, with the optical fiber wiring branching structure 90 disclosed herein, even in a structure in which multiple optical fibers 75 branch out from a single protective tube 72, the tension member 78 and the multiple optical fibers 75 can be prevented from rubbing against each other, thereby reducing the possibility of damaging the optical fibers 75.

Next, we will explain modified examples of the optical fiber wiring branching component 10 and optical fiber wiring branching structure 90 disclosed herein.

(First Modification)
7 is a diagram of a first modified example of the optical fiber distribution branch component 10 according to the present disclosure. In the first modified example, the tension member-passing portion 56 and the optical fiber-passing portion 54 formed in the branch portion 52 are not circular holes, but are grooves that extend radially outward from the branch portion 52.

As shown in Figure 7, even when the tension member passing portion 56 and the optical fiber passing portion 54 are grooved, the tension member 78 and the optical fiber 75 do not come into contact with each other inside the tubular portion 58.

Therefore, this modified example can also achieve the same effects as the optical fiber wiring branching component 10 disclosed herein.

(Second Modification)
8 is a diagram of a second modified example of the optical fiber distribution branching component 10 according to the present disclosure. In the second modified example, the second cable fixing component 30 and the first cable fixing component 20, which are two components in the embodiment of the present disclosure, are integrated into a cable fixing component 25. As a result, the optical fiber distribution branching component 10 has a two-part structure including the cable fixing component 25 and the branching component 50.

In the cable fixing component 25 shown in Figure 8, the optical cable main tube 70 is inserted from one axial side A1 of the cable fixing component 25, thereby fixing the protective tube 72 and tension member 78 to the through hole 36, as in the embodiment disclosed herein.

As shown in Figure 8, even when the second cable fixing component 30 and the first cable fixing component 20 are integrated into the cable fixing component 25, by connecting them to the branching component 50, the tension member 78 and the optical fiber 75 do not come into contact with each other.

Therefore, this modified example can also achieve the same effects as the optical fiber wiring branching component 10 disclosed herein.

(Other Modifications)
In the above description, the tension member-passing portion 56 and the optical fiber-passing portion 54 are arranged in an annular shape, but the shape of the branch portion 52 of the branch component 50 according to the present disclosure is not limited to this.

As explained above, in the branching component 50 according to the present disclosure, the tension member-passing portion 56 and the optical fiber-passing portion 54 are arranged in an annular shape, so they do not come into contact with each other inside the tubular portion 58, reducing the possibility of damage to the optical fiber 75.

The above-mentioned actions and effects can be obtained not only with circular rings, but also with elliptical rings, polygonal rings, and other shapes other than those that are concave inward when viewed from the axial direction, such as a heart shape.

Therefore, the term "annular" in this disclosure does not only refer to the circular annular shape described above, but also includes shapes such as elliptical annular shapes and polygonal annular shapes, excluding shapes that are concave inward when viewed from the axial direction, such as a heart shape.

In the above description, the optical fiber wiring branch component 10 is described as being connected by inserting other wiring components into the tension member passing portion 56 and the optical fiber passing portion 54 from one axial side A1 of the branch portion 52, but this is not limited to this.

As an example, the branch portion 52 may be configured as a component that does not allow other wiring components to be inserted from one axial side A1, such as a so-called connector.

Furthermore, in the above explanation, the optical cable main pipe 70 is described as having a protective tube 72 that houses the optical fiber 75, but this is not limited to this, and the same applies to an optical cable main pipe 70 that does not have a protective tube 72.

In the above description, the optical cable main tube 70 has been described as having one protective tube 72, but this is not limiting, and the optical fiber wiring branching component 10 according to the present disclosure may have an optical cable main tube 70 that has two or more protective tubes 72.

Embodiments of the present disclosure have been described above with reference to the accompanying drawings. However, it is clear that a person with ordinary skill in the art to which this disclosure pertains can conceive of various modifications and applications within the scope of the technical ideas set forth in the claims, and it is understood that these also naturally fall within the technical scope of the present disclosure.

10 Optical fiber wiring branching component 20 First cable fixing component 22 General portion 24 Fastening portion 25 Cable fixing component 26 End surface 28 Connection portion 30 Second cable fixing component 32 Partition portion 34 Through hole 36 Through hole 40 Fastening portion 41 Fastening portion 42 First connection portion 44 Second connection portion 50 Branching component 52 Branching portion 54 Optical fiber passing portion 56 Tension member passing portion 58 Cylinder portion 60 Fastening portion 61 Fastening portion 62 Connection portion 70 Optical cable main tube 72 Protective tube 74 Optical fiber bundle 75 Optical fiber 76 Spacer 78 Tension member 80 End portion 150 Branching component 152 Branching portion 154 Optical fiber passing portion 156 Tension member passing portion 158 Cylinder portion

Claims (4)

An optical fiber wiring branching component, which is connected to a single protective tube that houses all of a plurality of optical fibers and an optical cable main tube that houses a tension member arranged outside the protective tube, and which branches the tension member and the plurality of optical fibers,
a hollow cylindrical portion through which the tension member and the plurality of optical fibers pass from one side to the other in the axial direction;
a branch portion provided at the other end of the cylindrical portion in the axial direction, in which tension member passing portions through which the tension members pass and optical fiber passing portions through which the optical fibers pass are all arranged in an annular shape when viewed from the other side in the axial direction;
Equipped with
the optical cable main pipe is inserted into the one side of the cylindrical portion;
the through-portions formed in the branch portion are limited to the tension member through-portion and the optical fiber through-portion;
Optical fiber wiring branching parts. the tension member-passing portion and the optical fiber-passing portion are arranged in an annular shape when viewed from the axial direction;
The optical fiber wiring branch component according to claim 1. the optical cable main pipe;
the optical fiber wiring branching component according to claim 1 or 2, which is attached to an end of the optical cable main tube, the plurality of optical fibers being passed through the plurality of optical fiber passing portions, and the tension member being passed through the tension member passing portion;
An optical fiber wiring branching structure comprising: The optical cable main pipe,
an optical fiber wiring branching component attached to an end of the optical cable main tube , in which a plurality of optical fibers are passed through a plurality of optical fiber passing portions and a tension member is passed through the tension member passing portion;
Equipped with
The optical fiber wiring branching component comprises:
a hollow cylindrical portion through which the tension member and the plurality of optical fibers pass from one side to the other in the axial direction;
a branch portion provided at the other end of the cylindrical portion in the axial direction, in which the tension member passing portion through which the tension member passes and the optical fiber passing portion through which the optical fiber passes are arranged in an annular shape when viewed from the other side in the axial direction;
Equipped with
a main optical cable tube that houses one protective tube that houses all of the plurality of optical fibers and a tension member that is disposed outside the protective tube, is inserted into the one side of the cylindrical portion;
Optical fiber wiring branch structure.