JPH0634823A - Optical fiber extra length storage case - Google Patents

Abstract

(57) [Summary] [Object] To provide an optical fiber extra length storage case which has good connection workability and can reduce the size occupied by the bending of the optical fiber outside the extra length storage case body. [Structure] Second and third portions orthogonal to both ends of the first peripheral wall surface 2a
The optical fiber extra length storage case body 1 having the peripheral wall 2 provided with the peripheral wall surfaces 2b and 2c is used. The peripheral wall 2 is provided with a curved surface portion 2e in a direction that does not intersect the third peripheral wall surface 2c at an angle, but is orthogonal to the third peripheral wall surface 2c. The curved surface portion 2e is used as the connector connection adapter attachment portion 7. A plurality of connector connection adapters 8 are attached to the connector connection adapter attachment portion 7 in directions orthogonal to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber extra length storage case for storing an extra length of a looped optical fiber.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional optical fiber extra length storage case mainly has a rectangular parallelepiped extra length storage case body 1. The extra length storage case body 1 has a rectangular peripheral wall 2. The peripheral wall 2 includes a first peripheral wall surface 2a provided on the back surface and the first peripheral wall surface 2a.
Second and third peripheral wall surfaces 2b and 2c provided on the left and right in a direction orthogonal to both ends of the
2c and a fourth peripheral wall surface 2d provided on the front surface in a direction orthogonal to 2c. The bottom surface of the peripheral wall 2 is closed by a bottom plate 3. An upper plate (not shown) is provided on the upper surface of the peripheral wall 2 so as to be openable and closable.

The extra length storage case body 1 has a window adjacent to the first peripheral wall surface 2a on the second or third peripheral wall surfaces 2b and 2c which are not adjacent to each other when installed side by side as shown in the figure. 4 are provided. The extra length portion 5a of the optical fiber 5 is introduced into the extra length storage chamber 6 in the extra length storage case main body 1 through these windows 4, and the excess length portion 5a has a bending radius of R in the extra length storage chamber 6 as shown in the drawing. It has been rounded off.

Further, the fourth portion on the front surface of the extra length storage case body 1
The peripheral wall surface 2d of the third or second peripheral wall surface 2c, 2 which becomes adjacent when installed side by side as shown in the figure.
Connector connection adapter attachment portions 7 are provided at portions adjacent to b. Cylindrical connector connection adapters 8 pass through and are attached to these connector connection adapter attachment portions 7. In these connector connection adapters 8, the left and right optical fibers 5 having extra lengths 5a
Are connected by a plug-in type connector by another optical fiber 9. The optical fiber 9 is bent with a bending radius of R.

[0005]

In such an optical fiber extra length storage case, the bending radius R must be set to, for example, 30 mm or more in order to prevent an increase in loss due to bending of the optical fibers 5 and 9. In order to ensure such a bending radius R, in the conventional optical fiber extra length storage case, the occupying dimension W in the front-rear direction is large as shown in the figure because the protruding length of the optical fiber 9 from the front peripheral wall surface is large. There was a problem.

To avoid this, the third peripheral wall surface 2c is used as the connector connection adapter mounting portion 7 in the left optical fiber extra length storage case in FIG. 5, and the second peripheral wall surface is provided in the right optical fiber extra length storage case. It is conceivable to connect the connector 2b to the connector connection adapter attachment portion 7 by the optical fiber 9 between the third and second peripheral wall surfaces 2c and 2b. In this case, however, the tip opening portion of the connector connection adapter 8 is formed. Cannot be seen well, and there is a problem that connection workability deteriorates.

An object of the present invention is to provide an optical fiber extra length storage case which has good connection workability and can reduce the size occupied by the bending of the optical fiber outside the extra length storage case body. .

[0008]

To explain the structure of the present invention for achieving the above object, the present invention is directed to a peripheral wall provided with second and third peripheral wall surfaces which are orthogonal to both ends of the first peripheral wall surface. In the optical fiber extra length storage case in which a connector connection adapter mounting portion is provided on a part of the peripheral wall of the optical fiber extra length storage case body, at least one of the second or third peripheral wall surface is provided on the peripheral wall. Is provided with a curved surface portion in a direction that is not orthogonal to this and intersects diagonally, and the curved surface portion serves as the connector connection adapter attachment portion, and the connector connection adapter attachment portion includes a plurality of connector connection adapters, respectively. It is characterized in that they are mounted in a direction orthogonal to each other.

[0009]

As described above, the curved surface portion is provided on at least one of the second and third peripheral wall surfaces of the main body of the optical fiber extra length storage case in such a direction as not to be orthogonal thereto but obliquely intersecting with the curved surface portion. Is the connector connection adapter mounting portion, this connector connection adapter mounting portion retracts from the peripheral wall surface on the front side, and therefore the arc shape of the external optical fiber connected by using the connector connection adapter of the connector connection adapter mounting portion. The dimension by which the part projects from the peripheral wall surface of the front surface becomes smaller or becomes zero. Therefore, the occupied dimension W in the front-rear direction occupied by the optical fiber extra length storage case and the optical fiber externally connected to the case and having an arc shape is reduced.

Further, since the connecting work is performed at the diagonally intersecting surface portion seen from the front side, the connecting workability is also good. In particular, when the curved surface portion is used as the connector connection adapter attachment portion and a plurality of connector connection adapters are attached to the curved connector connection adapter attachment portion in a direction orthogonal to each other, these connector connection adapters are mutually connected inside or outside the curved surface portion. Even if the interval is widened and a plurality of connector connection adapters are arranged in parallel, the connector connection work can be easily performed by utilizing the widened space. Therefore, it is not necessary to increase the length of the curved surface portion, and it is possible to prevent the optical fiber extra length storage case main body from increasing in size.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. The parts corresponding to those in FIG. 5 described above are designated by the same reference numerals.

FIG. 1 shows a first embodiment of an optical fiber extra length storage case according to the present invention. The peripheral wall 2 in the optical fiber extra length storage case of the present embodiment has a curved surface portion 2e at a tip of the third peripheral wall surface 2c in a direction that is not orthogonal to the third peripheral wall surface 2c but obliquely intersects with the third peripheral wall surface 2c. In this embodiment, the curved surface portion 2e is formed to be convex inward. The tip of the curved surface portion 2e is connected to the fourth peripheral wall surface 2d. The curved surface portion 2e is the connector connection adapter attachment portion 7
Has become. A plurality of cylindrical connector connection adapters 8 are attached to the connector connection adapter attachment portion 7 formed of the curved surface portion 2e so as to penetrate in a direction orthogonal to each other.

FIG. 2 shows an example of use of such an optical fiber extra length storage case. The left side optical fiber extra length storage case shown in the figure is the same as that shown in FIG. 1, but the right side optical fiber extra length storage case is attached to the second peripheral wall surface 2b before the second peripheral wall surface 2b. This is different from the left side in that the curved surface portion 2e is provided in a direction in which the curved surface portion 2e is diagonally intersected with each other instead of being orthogonal.

Such left and right optical fiber extra length storage cases are arranged adjacent to each other as shown in the drawing, and the tip ends of the extra length portions 5a of the optical fibers 5 incorporated therein are connected to each other by an external optical fiber 9. A connector is connected in a plug-in format in the adapter 8.

In this case, since the connector connecting adapter mounting portion 7 is retracted from the front peripheral wall surface 2d, the arcuate portion of the external optical fiber 9 is projected from the front peripheral wall surface 2d first. It becomes zero or becomes small as shown. Therefore, the occupied dimension W in the front-rear direction occupied by the optical fiber extra length storage case and the optical fiber 9 externally connected to the optical fiber 9 and having an arc shape is reduced.

FIG. 3 shows a second embodiment of the optical fiber extra length storage case according to the present invention. In the optical fiber extra length storage case of the present embodiment, the connector connection adapter mounting portion 7 composed of the curved surface portion 2e is formed of a bent line surface in which a plurality of straight surface portions are bent and curved at the connecting portions. Although not shown, a cylindrical connector connection adapter 8 is inserted through these linear surface portions in a direction orthogonal to each other and attached.

By using the straight surface portion as described above, the connector connecting adapter 8 can be easily attached.

FIG. 4 shows a third embodiment of the optical fiber extra length storage case according to the present invention. In the optical fiber extra length storage case of this embodiment, the curved surface portion 2e is formed to be convex outward.

In this case, a plurality of cylindrical connector connection adapters 8 (not shown) which are respectively mounted orthogonally to the curved surface portion 2e are spaced apart from each other outside the optical fiber extra length storage case body 1. .

[0020]

As described above, in the optical fiber excess length storage case according to the present invention, at least one of the second and third peripheral wall surfaces of the peripheral wall of the optical fiber excess length storage case body is orthogonal to this. However, since the curved surface portion is provided in a direction that intersects diagonally and the curved surface portion is used as the connector connection adapter mounting portion, the connector connection adapter mounting portion recedes from the peripheral wall surface of the front surface, and therefore the connector connection adapter mounting portion The size in which the arcuate portion of the external optical fiber connected using the connector connection adapter protrudes from the peripheral wall surface of the front face becomes smaller or becomes zero. Therefore, the occupied dimension in the front-rear direction occupied by the optical fiber extra length storage case and the optical fiber externally connected to the optical fiber and having an arc shape can be reduced.

Further, since the connecting work is performed on the curved surface portion seen from the front side, the connecting workability is also good.

In particular, when the curved surface portion is used as the connector connection adapter attachment portion and a plurality of connector connection adapters are attached to the curved connector connection adapter attachment portion in directions orthogonal to each other, these connector connection adapters are located inside or outside the curved surface portion. Therefore, even if a plurality of connector connection adapters are arranged side by side, the connector connection work can be easily performed by utilizing the widened intervals. Therefore, it is not necessary to increase the length of the curved surface portion, and it is possible to prevent the optical fiber extra length storage case main body from increasing in size.

[Brief description of drawings]

FIG. 1 is a first optical fiber extra length storage case according to the present invention.
It is a perspective view of an Example.

FIG. 2 is a plan view showing a usage state of the optical fiber excess length storage case of the first embodiment.

FIG. 3 is a second optical fiber extra length storage case according to the present invention.
It is a perspective view of an Example.

FIG. 4 is a third optical fiber excess length storage case according to the present invention.
It is a perspective view of an Example.

FIG. 5 is a plan view showing a usage state of a conventional optical fiber extra length storage case.

[Explanation of symbols]

 1 extra length storage case main body 2 peripheral wall 2a first peripheral wall surface 2b second peripheral wall surface 2c third peripheral wall surface 2d fourth peripheral wall surface 2e curved surface portion 3 bottom plate 4 window 5 optical fiber 5a extra length portion 6 extra length storage Room 7 Connector connection adapter attachment part 8 Connector connection adapter 9 Optical fiber

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Sugita 5-23-8 Nishigotanda, Shinagawa-ku, Tokyo Incorporated in Seiden Co., Ltd. (72) Inventor Toshihide Asano 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Date (72) Inventor Akira Sugawara 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Co., Ltd.

Claims (1)

[Claims] 1. A connector connection adapter mounting portion is provided on a part of a peripheral wall of an optical fiber extra length storage case body having a peripheral wall provided with second and third peripheral wall surfaces orthogonal to both ends of the first peripheral wall surface. In the optical fiber extra length storage case provided with, a curved surface portion is provided on the peripheral wall on at least one of the second or third peripheral wall surfaces in a direction that intersects obliquely without being orthogonal to it. An optical fiber surplus length storage case, wherein the curved surface portion serves as the connector connection adapter attachment portion, and a plurality of connector connection adapters are attached to the connector connection adapter attachment portion in directions orthogonal to each other.