JP2001255436A - Auxiliary tool for two-core tape conversion for optical fiber terminal in connecting to optical connector, and method for processing terminal using such tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an auxiliary tool 10 for converting an optical fiber terminal, for the purpose of using only the terminal part as a two-core tape connectable in a short time to a two-core connector subsequently, by attaching the tool 10 to the terminal of two single-core optical fibers, which are taken out from a single-core fiber collected type optical cable, and thereby easily converting the two fibers into a two-core tape. SOLUTION: The auxiliary tool 10 for two-core tape conversion is such that it is composed of two bisected members and that semi-circular grooves are provided in each of the bisected members so that, when these members are integrated, two single-core optical fibers 14, 16 can be fixedly held with the same pitch width as that of optical fibers in a two-core optical connector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary tool for taking out a single-core optical fiber from a single-core optical fiber cable and converting the end of the optical fiber into a two-core tape. It also includes an auxiliary device for an optical fiber terminal which can be easily connected to a two-core optical connector, particularly an MTRJ optical connector on site, and an optical fiber terminal processing method using the auxiliary device.

[0002]

2. Description of the Related Art FIG. 3A is a cross-sectional view of a single-core optical fiber cable 30 having a diameter of 0.25 mm, in which six tubes 34a to 34f are arranged around a central tension member 36 in an outer sheath 32. 0.25m inside each tube
Many single-core optical fibers 38 of mφ are inserted. Such an optical cable 30 extends, for example, in a vertical system of a building. To drop the optical cable 30 to each floor, as shown in FIG. After taking out the fiber 38, it was connected to the optical connector in the field.

[0003]

In recent years, as the demand for an optical interface using two cores as a reference unit has increased, an optical connector for two cores has been generally used as an optical connector. In particular, as shown in FIG. As described above, in a situation where the MTRJ optical connector 40 in which optical fibers are arranged at a pitch of 0.75 mm as a standard optical connector for LAN is rapidly penetrating, the optical fiber 38 pulled down from the single-core aggregated optical cable 30 is replaced with the above-described one. Conventionally, when connecting to a two-fiber optical connector in the field, a) the coating of two single-core optical fibers must be removed; The optical fiber must be connected to the optical connector while maintaining the connector pitch (0.75 mm in the case of the MTRJ optical connector). Etc. that must be aligned with the tip of the wire, there was a very tedious work as field operations.
An object of the present invention is to make the above-mentioned conventional cumbersome work as easy as possible, and to provide a terminal portion of two single-core optical fibers extracted from a single-core optical fiber cable. By attaching the two-core tape conversion aid, it is possible to easily connect to the two-core optical connector, and to remove the coating of the optical fiber terminal and align the leading end of the optical fiber in a short time. An optical fiber terminal processing method is provided.

[0004]

In order to achieve this object, according to the present invention, the ends of two single-core optical fibers extracted from a single-core optical fiber cable are formed into a two-core tape. In the assisting tool for converting, the assisting tool is composed of two half members, and when the two half members are united, 2
A semicircular groove is provided in each half member so that both single-core optical fibers can be fixedly held at the same pitch width as the core pitch of the core optical connector. According to a second aspect of the present invention, the two single-core optical fibers having the same pitch width as the core pitch of the two-core optical connector are provided at the ends of two single-core optical fibers taken out from the single-core optical fiber cable. Attach a two-core tape conversion aid that can hold the fiber fixed, then cut and remove a part of the aid and the outer sheath of both optical fibers together with a stripper, and then align the tips of both optical fibers from which the outer sheath has been removed. This is a method for processing the terminal of the cut optical fiber.

[0005]

According to the invention of claim 1 of the present invention, since the two-core tape conversion aid is divided into two parts, it does not take much time to attach the aid to the end of the optical fiber.
In addition, since this auxiliary tool fixedly holds the two single-core optical fibers with the same pitch width as the core pitch of the two-core optical connector, the connection with the two-core optical connector can be easily performed. Further, according to the invention of claim 2 of the present invention, the two-core tape conversion aid and the outer sheath of the optical fiber can be cut and removed together by a stripper, and thereafter, the optical fiber strands from which the outer sheath has been removed are aligned and cut. By simply doing so, processing of an optical fiber terminal connectable to the optical connector can be performed in a short time.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a work process diagram for attaching a two-core tape conversion aid to the ends of two single-core optical fibers.
FIG. 5 is a work process diagram for explaining a method of processing an optical fiber terminal to connect the optical fiber with the auxiliary tool attached thereto to a two-core optical connector, and illustrates a two-core process shown in FIG. The tape converting aid 10 includes two half-shaped plastic half-members 12a and 12b. The two half-members 12a and 12b are illuminated when the two members are united together. Semicircular grooves 12a 'and 12b' for accommodating two 0.25 mmφ single-core optical fibers 14 and 16 at the same interval as the core pitch of the connector (0.75 mm in the case of the MTRJ optical connector). Is formed.
The size when the two half members 12a and 12b are integrated is such that the length in the optical fiber direction is about 50 mm to 500 mm, the thickness is about 0.4 mm, and the width is slightly longer than the core wire pitch width. The diameter of the through hole formed by the two grooves 12a 'and 12b' is about 0.25 mm to 0.3 mm. In order to attach the two-core tape conversion aid 10 to the end of the optical fiber, the two single-core optical fibers 14 and 16 drawn from the single-core aggregated optical cable are connected to one end as shown in FIG. The two single-core optical fibers 14, 16 are fixed to the half member 12b with an adhesive 18 while being housed in the semicircular groove 12b 'of the half member 12b, and the other half member 12a is fixed.
1 is bonded to one half member 12b with an adhesive.
Two single-core optical fibers with the auxiliary tool shown in (c) can be handled as a two-core tape core only at the end portion, and the two optical fibers are the core pitch of the two-core optical connector. It is fixedly held at the pitch width that matches with
The connection work with the optical connector can be performed easily.

Next, referring to FIG. 2, an optical fiber terminal processing method for connecting the two-core tape conversion aid 10 attached to the optical fiber terminal to the two-core MTRJ optical connector 40 shown in FIG. 4 will be described. . FIG. 2A shows a state in which the two-core tape conversion aid 10 is attached to the ends of two single-core optical fibers 14 and 16. In this state, the outer sheaths of the optical fibers 14 and 16 are covered, and the tips are not aligned. From this state, as shown in FIG. 2B, the core stripper 20 is used to squeeze in the direction of arrow X to remove a part of the plastic auxiliary tool and the outer sheath of each optical fiber. Thereafter, the ends of the bare optical fiber wires 14a, 16a are aligned and cut as shown in FIG.
Connection to is enabled. As a material of the two-core tape conversion aid 10, a material which can be easily cut and removed with a commercially available stripper is desirable, and a urethane acrylate resin, P
VC-based, Hytrel, soft nylon and the like are suitable.

[0008]

As described above, according to the present invention, the pitch width adjusted to the core pitch of the two-core optical connector is applied to the terminal portions of the two single-core optical fibers extracted from the single-core optical fiber cable. The two-core tape conversion aid that can fix and hold the optical fiber is attached, so that the work of attaching the single-core optical fiber to the aid is easy, and at the same time, the end of the optical fiber is attached to the two-core tape. Can be treated like a line,
The connection work with the optical connector can be performed easily.
In addition, when connecting to an optical connector, both the part of this auxiliary tool and the outer sheath of the optical fiber are cut and removed at once, and the ends of the optical fiber wires with the outer sheath removed are aligned and cut. In addition, it is not necessary to align the ends of the optical fibers in advance and store and fix them in the auxiliary tool, and the terminal processing of the optical fibers can be performed in a short time.

[Brief description of the drawings]

FIG. 1 is a work process diagram for attaching a two-core tape conversion aid according to the first aspect of the present invention to terminal portions of two single-core optical fibers.

FIG. 2 is a working process diagram of the invention according to claim 2, for explaining a method of processing an optical fiber terminal to connect an optical fiber with a two-core tape conversion aid attached to a two-core optical connector. .

FIG. 3A is a cross-sectional view of a single-core optical fiber cable commonly used in the related art, and FIG. 3B is a perspective view illustrating a state in which a plurality of single-core optical fibers are partially extracted from the single-core optical cable. is there.

FIG. 4 is a schematic view of an MTRJ optical connector.

[Explanation of symbols]

 Reference numeral 10: a two-core tape conversion aid 12a, 12b: a half member 12a ', 12b': a semicircular groove 14, 16, a single-core optical fiber 14a, 16a: light Fiber strand 18 ... Adhesive 20 ... Core stripper 30 ... Single fiber bundle type optical cable 32 ... Outer sheath 34a-34f ... Tube 36 ... Tension member 38 ... Single Core optical fiber 40 ... MTRJ optical connector

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Suehiro Miyamoto 1440, Misaki, Sakura City, Chiba Prefecture Fujikura Co., Ltd. Sakura Plant F-term (reference) 2H036 KA01 KA02 LA02 LA07 LA11 LA01 NA01 QA56

Claims (2)

[Claims] 1. An optical fiber cable extracted from a single-core optical fiber cable
In an auxiliary tool for converting the end portion of the single-core optical fiber into a two-core tape, the auxiliary tool is composed of two half members, and when the two half members are combined, a two-core optical fiber is formed. A two-core tape conversion aid, wherein a semicircular groove is provided in each half member so that both single-core optical fibers can be fixedly held at the same pitch width as the core wire pitch of the connector. 2. An optical fiber cable extracted from a single-core optical fiber cable
At the end of the single-core optical fiber, a two-core tape conversion auxiliary tool that can fix and hold both single-core optical fibers at the same pitch width as the core pitch of the two-core optical connector is attached, and then the auxiliary tool is used with a stripper. An optical fiber terminal processing method in which a part of the optical fiber and the outer sheaths of both optical fibers are cut and removed together, and then the ends of both optical fibers from which the outer sheaths are removed are aligned and cut.