JPS5918405Y2 - Optical fiber cable connection - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a connection part of an optical fiber cable.

Recently, it is expected that communication lines connecting two points will be loaded with new communication methods such as data transmission, facsimile, and image communication in addition to communications centered on telephones, and the amount of load will be extremely large. However, in preparation for this, various new high-capacity communication lines are being developed.

One of these is optical fiber cable, which uses glass fiber as a transmission path and can accommodate a large number of lines in a small cross-sectional area, making it an extremely effective means of high-capacity communication lines. It has become.

When making a permanent connection (splice) with this optical fiber cable, consider the workability and the need to redo the splice in the unlikely event that the splice fails. Therefore, there is slack in the connection after the splice is completed.

This slack must be stored in the storage section, but if the radius of curvature of the slack falls below a predetermined value during storage, there is a risk that the optical fiber cable will break due to bending stress. The disadvantage is that the storage section becomes large, the cost of the storage section increases, and an unnecessarily large space is required.

If the size of the storage compartment is fixed, and if connections with different lengths of slack are manually pushed into the storage compartment, the fiber optic cable may become twisted, and the radius of curvature may be small in some areas. This may cause damage to the optical fiber cable or increase transmission loss.
Further, from the standpoint of reliability, it is desirable that the splice be made as straight as possible, but this has the disadvantage that this cannot always be maintained when manually pushing the splice into the storage section.

The present invention improves the above-mentioned drawbacks of the optical fiber cable connection, is easy to work with, does not require a large space, accommodates slack with a constant radius of curvature, and has a straight splice. It is intended to provide connections for fiber cables.

Embodiments of the present invention will be described above based on the drawings.

FIG. 1A is a side view including a partial cross section of the present invention-embodiment;
A state in which optical fiber cable accommodation has started is shown, and Figure B is a similar diagram showing a state after accommodation has been completed.

FIG. 2 is a front view thereof. In both figures, the connecting portion of the optical fiber cable 1 is housed in a housing case 2.

The storage case 2 is a columnar body, and its cross section is a straight section 2A.
, and two curved parts 2B connected to both ends of the straight part 2A, forming a modified U-shape.

The radius of curvature of the curved portion 2B is less than % of the length of the straight portion 2A.

The optical fiber cable 1 housed in the housing case 2 has an entrance part and an exit part 1A, a straight part 1B and a semi-interior part 1C.
The splice portion 3 is located at the straight portion IB.

Further, the radius of curvature of the semicircular portion 1C is approximately % of the inner dimension l of the housing case 2.

The operation of housing the optical fiber cable 1 after the splicing operation into the housing case 2 is extremely simple.

That is, if the optical fiber cable 1 with its splice portion 3 wound around the center of the cable is inserted through the opening 2C of the housing case 2 as shown in FIG. 1A,
The optical fiber cable 1 is easily accommodated in the shape shown in FIGS. 1B and 2 by its own elasticity.

When accommodating several optical fiber cables 1 with different lengths of slack at the connection parts, the radius of curvature of the semicircular part 1C can be kept constant (
can be kept at "k)".

The housing case 2 can be easily manufactured by bending a metal plate.

Furthermore, by making the dimensions of the straight section 2A of the housing case 2 approximately equal to the inner diameter of the optical fiber cable protective sleeve 4, the housing case 2 housing the optical fiber cable 1 can be covered with the protective sleeve 4 (see Fig. 3). Furthermore, the optical fiber cable 1 can be accommodated within the defined space with the maximum radius of curvature.

As described above, according to the present invention, the optical fiber cable 1 can be accommodated in the accommodation case 2 with the maximum radius of curvature within a limited space, and the accommodation work is extremely simple. Moreover, the manufacturing of the housing case 2 is also extremely easy.

In other words, it must be said that the present invention plays an extremely important role in effectively utilizing optical fiber cables as high-capacity communication lines.

[Brief explanation of the drawing]

1A and 1B are side views including a partial cross section showing the connection portion of the optical fiber cable according to the present invention in different states;
The figure is a front view thereof, and FIG. 3 is a diagram showing a state in which the connecting portion is housed in a protective sleeve.

Claims (1)

[Scope of utility model registration request] Consisting of a cylindrical protective sleeve, a housing case disposed within the sleeve, and an optical fiber cable housed within the housing case, the housing case has a cross-sectional shape that connects to a straight line at both ends of the straight line. A columnar body having a deformed U-shape composed of two curved lines, wherein the radius of curvature of the curved line is less than % of the straight line, and both ends of the straight line of the storage case are in contact with the inner surface of the protective sleeve, and A connection part of an optical fiber cable characterized by a splice part that is in contact with a straight line.