JPS6190102A - Terminal fixation structure of multicore optical fiber cable - Google Patents

Abstract

PURPOSE:To prevent the breaking of an optical fiber core due to a projection phenomenon resulting from the shrinkage of a cable sheath by charging an adhesive in the space formed between the bottom part of a receptacle and the terminal-treated surface of a multicore fiber cable inserted into the receptacle. CONSTITUTION:The terminal-treated multicore optical fiber cable 12 out of which a specific number of optical fiber cores 16 are led is run through a metallic terminal fixture 11 as the container-shaped receptacle which has a specific number of through holes 16 in the bottom part 9. Then, the optical fiber cores 16 and a tension member 17 are run through the through holes 14 of the metallic terminal fixture 11. Further, the adhesive 13 is charged in the space formed by separating the bottom part 9 of the metallic terminal fixture 11 and the terminal-treated surface 12a of the cable 2 from each other by specific distance to fix all of the optical fiber cores 16, tension member 17, plastic interposing cord 18, and cable sheath 19 which constitute the cable 12 to the metallic terminal fixture 11.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a structure for fixing the terminal of a multi-core optical fiber cable, and particularly to a structure for fixing the end of a multi-core optical fiber cable, and in particular, to prevent the protrusion of optical fiber cores caused by shrinkage of the jacket of a cable connected to a connector. This invention relates to a structure for fixing the terminals of multi-core optical fiber cables, which is adopted to prevent disconnections caused by such cables.

[Technical Background of the Invention] Conventionally, a multi-core optical fiber cable terminal fixing structure (hereinafter referred to as terminal fixing structure) as shown in FIG. 3 has been known. This type of terminal fixing structure 1 is as follows.

A multi-core optical fiber cable (hereinafter referred to as a cable) 2 is inserted into a tubular terminal fitting 3 and subjected to terminal treatment, and the optical fiber core 4 is connected to the ferrule 5 of the connector 8, and in this state, the cable jacket 6 is inserted. is to be tightened with a cable clamp 7 via a terminal fitting 3.

[Problems with background technology] However, in such a terminal fixed structure.

There is a problem in that the optical fiber core wire is exposed inside the connector due to the contraction of the cable jacket, causing bending and breakage.

[Object of the invention] - The present invention was made in view of the above-mentioned problems, and provides a terminal fixing method for a multi-core optical fiber cable that prevents the optical fiber core from breaking inside the connector due to the protruding phenomenon. The purpose is to provide structure.

[Summary of the Invention] To achieve this object, the multi-core optical fiber cable terminal fixing structure of the present invention includes a container-shaped receiver having a predetermined number of through holes at the bottom and a predetermined number of optical fiber cores. a multi-core optical fiber cable that is terminated to draw out the wire and is inserted into the receiver to allow the optical fiber core to pass through the through-hole of the receiver; An adhesive is filled in a space formed by separating the end-treated surface of the optical fiber cable for a predetermined period.

[Embodiments of the invention] A preferred embodiment of the invention will be described in detail with reference to FIG.

The multi-core optical fiber cable terminal fixing structure 10 of the present invention is composed of a terminal fitting 11 as a receiver, a multi-core optical fiber cable (hereinafter referred to as a cable) 12, and an adhesive 13. First, a container-shaped terminal fitting 11 having a predetermined number of through holes 14 in the bottom part 9 has a cylindrical shape and has a flange 15 in the bottom part 9.
It has a structure that has In addition, the cable 12 is terminal-treated to draw out a predetermined number of optical fiber cores 16.
It has a tension member 17 as a reinforcing body made of flexible copper wire, FRP, etc. at the center, and a predetermined number of optical fiber cores [16] are arranged around it. Furthermore, this cable 1
2 is a cable in which a plastic intervening string 18 made of polypropylene or the like is placed around an optical fiber core 16 and covered with a cable sheath 19, leaving the optical fiber core 16 and tension member 17 outside the cable. The cover 19 and the plastic intervening string 18 are cut. In this state, the cable 12 is inserted into the terminal fitting 11 in order to pass the optical fiber core a 16 and the tension member 17 into the through hole 14 of the terminal fitting 11. Further, the adhesive 13 filled in the space formed by separating the bottom part 9 of the terminal fitting 11 and the terminal treated surface 12a of the cable 12 by a predetermined distance is applied to the optical fiber core 1 which has passed through the through hole 14.
The cable 12 is fixed to the terminal fitting 11 by penetrating into the gap between the cable 12 and the tension member 17 passing through the through hole 14 and the gap between the cable 12 and the tension member 17 passing through the through hole 14 .

The functions of the multi-core optical fiber cable terminal fixing structure of the present invention constructed as described above will be explained with reference to FIG. 1. Optical fiber core wire 1 constituting cable 12
6, tension member 17, plastic intervening string 18
Since the entire cable sheath 19 is fixed to the terminal fitting 11 with the adhesive 13, the optical fiber core 16 does not stick out due to contraction of the cable sheath 19. By doing so, the optical fiber core 16 is projected in the opposite direction to the terminal fitting 11. However, when comparing the length difference between the cable jacket 19 and the optical fiber coated wire 16 caused by this protrusion, the optical fiber coated wire 16 is inevitably longer. In this case, the optical fiber core 16, which has become longer due to the protrusion, is attached to the cable 1.
It is held down as a bend within 2. In reality, the cable 12 is long, several ions or more long, so the protruding length is several centimeters.
Even so, the actual difference is only a few percent, so the overflow can be sufficiently absorbed.

Next, an example of the use of the multi-core optical fiber cable terminal fixing structure of the present invention will be explained based on FIG. 2. The terminal fixing structure 10 is fixed by a connector shell 20 of a connector (not shown) and a clamp 22.

By doing this, the force is transmitted to the tension member 17 to the connector through the hook portion 2 formed between the flange 15 of the terminal fitting 11 and the inside of the connector shell 20.
1. Further, the force in the compression direction of the cable 12 is stopped by the clamp 22. As a result, no unnecessary force is applied to the optical fiber core 16.

[Effects of the Invention] As is clear from the above embodiments, according to the multi-core optical fiber cable terminal fixing structure of the present invention, the bottom of the receiver and the multi-core optical fiber cable fitted into the receiver In the space formed by the terminal processing surface.

Since the cable is fixed by being filled with adhesive, it is possible to prevent the optical fiber from breaking inside the connector due to the sticking phenomenon.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the configuration of the multi-core optical fiber cable terminal fixing structure according to the present invention, and FIG. 2 is a cross-sectional view showing the configuration when the multi-core optical fiber cable terminal fixing structure according to the present invention is fixed to a connector. FIG. 3 is a cross-sectional view showing a conventional multi-core optical fiber cable terminal fixing structure fixed to a connector. 9... Bottom part 10... Multi-core optical fiber cable terminal fixing structure 11... Terminal fitting (receptor) 12... Multi-core optical fiber cable 12a ...
... Terminal treatment surface 13 ... Adhesive 14 ... Through hole 16 ... Optical fiber core agent Patent attorney Moriya - Yuhaya l Figure sheep 2 Ogi No. 3 Amendment to figure procedure (voluntary) November 16, 1980 Manabu Shiga, Commissioner of the Japan Patent Office2, Name of invention Terminal fixing structure for multi-fiber optical fiber cable 3, Relationship with the person making the amendment Case Patent applicant ( 225) Showa Densan Co., Ltd. 4, Agent 3-9-5 Nihonbashi Honmachi, Chuo-ku, Tokyo 103 +7- β

Claims (1)

[Claims] A container-shaped receiver having a predetermined number of through holes at the bottom, the receiver being terminal-treated to draw out a predetermined number of coated optical fibers, and allowing the coated optical fibers to pass through the through holes of the receiver. A multi-core optical fiber cable inserted into the body,
Terminal fixing of a multi-core optical fiber cable, characterized by comprising an adhesive filled in a space formed by separating the bottom of the receptor and the terminal treated surface of the multi-core optical fiber cable by a predetermined distance. structure.