JPH0634820A - 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. This peripheral wall 2 is provided with an oblique intersecting surface portion 2e which obliquely intersects the third peripheral wall surface 2c without being orthogonal thereto. The diagonally intersecting surface portion 2e is used as the connector connection adapter attachment portion 7, and the connector connection adapter 8 is penetrated and attached.

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. 6, 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. 6 and the second peripheral wall surface 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. In addition, an oblique crossing surface portion that is not orthogonal to this and obliquely crosses is provided, and the diagonal crossing surface portion serves as the connector connection adapter attachment portion.

[0009]

As described above, at least one of the second and third peripheral wall surfaces of the peripheral wall of the optical fiber extra length storage case body is provided with an oblique intersecting surface portion that obliquely intersects with the obliquely intersecting surface portion. Is the connector connection adapter mounting portion, this connector connection adapter mounting portion is retracted from the peripheral wall surface on the front side, and therefore the arc-shaped outer optical fiber connected using the connector connection adapter of the connector connection adapter mounting portion is used. 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.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. The parts corresponding to those in FIG. 6 described above are denoted 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 an oblique intersecting surface portion 2e that is not orthogonal to the third peripheral wall surface 2c but obliquely intersects with the third peripheral wall surface 2c. The tip of the diagonal intersecting surface portion 2e is connected to the fourth peripheral wall surface 2d. The diagonal intersecting surface portion 2e serves as a connector connection adapter attachment portion 7, and a tubular connector connection adapter 8 is attached therethrough.

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. It differs from the one on the left side in that it has diagonal crossing surface portions 2e that intersect diagonally without being orthogonal to each other.

In such left and right optical fiber extra length storage cases, as shown in the drawing, they are arranged adjacent to each other, and the tips of the extra length portions 5a of the optical fibers 5 respectively incorporated therein are inserted into the external optical fiber 9. The connector is connected in a plug-in form in the connector-like 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.

Further, as shown in FIG.
Since the bending radius R of the optical fiber 5 adjacent to the connector connecting portion 10 for connecting 9 can be increased, the loop removal of the extra length portion 5a can be smoothly performed. Therefore, it is possible to prevent an increase in loss due to bending of the optical fiber 5.

Further, the arcuate extra length portion 5a of the portion A in FIG.
It can be absorbed by the wheel surplus length portion 5a of the B portion, and the bending radius R of the arc-shaped surplus length portion 5a of the A portion can be made gentle.

FIG. 4 shows a second embodiment of the 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 an oblique intersection surface portion 2e which obliquely intersects the third peripheral wall surface 2c without being orthogonal to each other, and the oblique intersection surface portion 2e is the second peripheral wall surface. It is connected to the fourth peripheral wall surface 2d through the peripheral wall surface 2f parallel to 2b. The diagonal intersecting surface portion 2e serves as the connector connection adapter attachment portion 7 as described above.

With such a structure, the arcuate extra length portion 5a of the portion A in the figure is absorbed more by the wheel take-up extra length portion 5a of the portion B than in the case of FIG. The bending radius R of 5a can be made gentler.

[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 diagonally intersecting surface portion that diagonally intersects is provided and the diagonally intersecting surface portion is used as the connector connecting adapter mounting portion, the connector connecting adapter mounting portion recedes from the peripheral wall surface of the front surface, and therefore the connector connecting adapter mounting portion It is possible to reduce the size of the arcuate portion of the external optical fiber connected by using the connector connecting adapter, which protrudes from the peripheral wall surface of the front face to be small or zero. Therefore, according to the present invention, the occupied dimension in the front-rear direction occupied by the optical fiber extra length storage case and the optical fiber which is externally connected to the optical fiber and has an arc shape can be reduced. Moreover, since the connection work with the outside can be performed at the diagonally intersecting surface portion seen from the front side, there is an advantage that the connection workability is also good. Further, when the diagonal crossing surface portion is provided and the connector connecting adapter is provided on the diagonal crossing surface portion, the arc-shaped extra length portion from the looped portion of the optical fiber extra length portion to the connector connection adapter is formed in the extra length storage chamber. It is absorbed by the extra length portion, the bending radius of the arc-shaped extra length portion can be made gentle, and an increase in loss due to bending of the wheel take-up extra length portion can be prevented.

[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 plan view showing a connection state of an optical fiber and an external optical fiber in the optical fiber extra length storage case of the first embodiment.

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

FIG. 5 is a plan view of an optical fiber extra length storage case of the second embodiment.

FIG. 6 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 3 bottom plate 4 window 5 optical fiber 5a extra length portion 6 extra length storage chamber 7 connector Connection adapter attachment part 8 Connector connection adapter 9 Optical fiber 10 Connector connection part

 ─────────────────────────────────────────────────── ─── 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 surplus length storage case main 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, the peripheral wall is provided with at least one of the second or third peripheral wall surface with an oblique crossing surface portion that obliquely intersects with the at least one of the second and third peripheral wall surfaces, An optical fiber extra length storage case, characterized in that the diagonally intersecting surface portion serves as the connector connection adapter mounting portion.