JP2000028877A - Optical fiber drop and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber drop formed by using a coated fiber excellent in handling workability of the coated fiber and a process for producing the same. SOLUTION: The optical fiber drop formed by subjecting a supporting wire 1 and a fiber part 4 longitudinally placed with tension members 3 on both sides of at least one vinyl coated fiber 2 to simultaneously vinyl coating with a vinyl sheath 5 is provided with a neck part 6 between the fiber part 4 and supporting wire 1 thereof and, therefore, the exposure of the coated fiber does not occur at the time of separating the fiber part 4 and the supporting wire 1 and the handling work of the coated fiber is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical fiber drop and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view of a conventional optical fiber drop.

[0003] This optical fiber drop comprises a support wire 1 and
A fiber portion 4a in which tension members 3 are vertically attached to both sides of a SM (single mode) fiber 9 having a standard outer diameter of 250 μm is collectively covered with a vinyl sheath 5, and a neck portion 6 and notches 7, 8 are provided on the vinyl sheath 5.

The reason why the SM fiber 9 having a standard outer diameter of 250 μm is used for the optical fiber drop is to reduce the diameter, weight, and cost.

[0005]

However, the conventional optical fiber drop has the following problems.

1) It is difficult to further reduce the manufacturing cost.

2) Since a 250 μm fiber core wire is exposed in a connection box or the like, an accident may occur in which the core wire is accidentally damaged or disconnected during the connection work.

3) Since the fiber core wire is exposed during the connection work, it requires careful handling, the connection work efficiency is reduced, and the construction cost is increased.

It is an object of the present invention to solve the above-mentioned problems and to provide an optical fiber drop using a coated fiber excellent in workability of handling a core wire and a method of manufacturing the same.

[0010]

In order to achieve the above object, an optical fiber drop according to the present invention comprises a support line and a fiber section in which tension members are vertically attached to both sides of at least one vinyl-coated fiber. It is covered, and a neck is provided between the fiber portion and the support wire.

[0011] In addition to the above configuration, the optical fiber drop of the present invention facilitates separation of the support wire and the fiber portion.
A notch may be provided in the neck portion coated with vinyl at a time.

In addition to the above configuration, the optical fiber drop of the present invention may be provided with a notch at the center of the fiber portion coated with vinyl at a time in order to easily peel the coated fiber.

The method of manufacturing an optical fiber drop according to the present invention includes a step of vertically attaching a support wire, at least one vinyl-coated fiber and a tension member to form a fiber portion, and a step of collectively applying a vinyl sheath to the fiber portion and the support wire. And providing a neck portion between the support wire and the fiber portion in tandem or individually on a dedicated line.

According to the invention, the support line and at least one
Since a neck portion is provided between the fiber portion of the optical fiber drop in which the tension member is longitudinally attached to both sides of the vinyl-coated fiber and the vinyl sheath collectively vinyl-coated optical fiber drop and the support wire 1, the fiber portion and the support wire are separated. At the time of separation, the fiber core wire is not exposed, and the work of handling the core wire becomes easy.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment to which an optical fiber drop manufacturing method according to the present invention is applied. still,
The same reference numerals are used for members similar to those of the conventional example shown in FIG.

The present optical fiber drop comprises support wires 1 and 1
One (although in the figure, one or two or more) vinyl-coated fibers 2 is provided, on both sides, with a fiber portion 4 having tension members 3 longitudinally attached thereto, and a vinyl sheath 5 for collectively coating the fiber portions 4. A neck 6 is provided between the fiber section 4 and the fiber section 4.

Since the notch 7 is provided in the neck portion 6, it is easy to separate the support wire 1 from the fiber portion 4. Since the notch 8 is provided at the center of the fiber portion 4, the vinyl-coated fiber 2 can be easily peeled off.

The vinyl-coated fiber 2 is made of a material different from that of the vinyl sheath 5 for collective coating, or is coated with a release agent such as talc, so that it does not adhere at the time of collective coating. Vinyl sheath 5
Can be easily stripped from

The method of manufacturing the optical fiber drop includes the steps of vertically attaching a support wire 1, at least one vinyl-coated fiber 2 and a tension member 3 to form a fiber portion 4, The step of collectively applying the vinyl sheath 5 and providing the neck portion 6 between the support wire 1 and the fiber portion 4 is performed in tandem (the two steps may be separately performed on a dedicated line).

Instead of the vinyl-coated fiber 2, a coated fiber such as a nylon-coated fiber or a UV-coated fiber having a large diameter may be used. Further, a sheath such as PE may be used instead of the vinyl sheath 5.

As described above, according to the present invention, (1) good workability can be obtained. Conventional 250 μm SM
In the structure using the fiber, an accident such as erroneous damage or breakage of the core wire is likely to occur. However, according to the present invention, since the handling operation of the core wire is good, the above-described accident does not occur.

(2) Cost can be reduced. Since the core wire handling work is good, the efficiency of the construction is improved, the construction cost can be reduced, and the total cost can be reduced.

[0024]

In summary, according to the present invention, the following excellent effects are exhibited.

It is possible to provide an optical fiber drop using a coated fiber excellent in workability of handling a core wire and a method of manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment to which an optical fiber drop manufacturing method of the present invention is applied.

FIG. 2 is a sectional view of a conventional optical fiber drop.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support wire 2 Vinyl-coated fiber 3 Tension member 4 Fiber part 5 Vinyl sheath

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takahiro Sato 5-1-1, Hidaka-cho, Hitachi City, Ibaraki Prefecture F-term in the Hidaka Factory of Hitachi Cable, Ltd. (Reference) 2H001 BB06 BB27 DD06 HH02 KK17 KK22 MM01

Claims (4)

[Claims] 1. A support line and a fiber portion in which tension members are vertically attached to both sides of at least one vinyl-coated fiber are collectively vinyl-coated, and a neck portion is provided between the fiber portion and the support line. An optical fiber drop. 2. The optical fiber drop according to claim 1, wherein a notch is provided in a neck portion which is collectively coated with vinyl to facilitate separation of the support wire and the fiber portion. 3. An optical fiber drop according to claim 1, wherein a notch is provided at the center of the fiber portion coated with vinyl at a time to facilitate peeling of the coated fiber. 4. A step of vertically attaching a support wire, at least one vinyl-coated fiber and a tension member to form a fiber portion, and applying a vinyl sheath to the fiber portion and the support wire at once to form a support wire and a fiber. A step of providing a neck portion between the optical fiber and the optical fiber drop in a tandem manner or individually on a dedicated line.