JPH0634821A - Storing case for optical fiber excessive length - Google Patents

Abstract

PURPOSE:To obtain good connection operability and downsize a case body by projecting the part, where a connector connection adapter is not fitted, of a peripheral wall surface fitted with a connector connection adapter outwardly in a projecting shape. CONSTITUTION:The part 2dt. where the connector connection adapter 7 is not fitted, of the peripheral wall surface 2d, where the connector connection adapter 7 is fitted, of the peripheral wall 2 of the optical fiber excessive-length storage case body 1 is curved outwardly, to a bending radius R. Thus, the part 2dt which projects in the projecting shape is provided and then the excessive-length storage chamber 6 of the excessive-length storage case body 1 becomes wider by its size. Therefore, even when the excessive-length storage case body 1 is downsized, the optical fiber excessive-length part 5a can be looped and stored having at least the bending radius R, and the optical fiber excessive-length storage case can be downsized. Namely, the dead space can effectively be utilized. Further, the connection operability is good.

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. 3, a conventional optical fiber extra length storage case has a structure in which an extra length storage case body 1 of a rectangular parallelepiped is mainly used. The extra length storage case body 1 has a peripheral wall 2 formed in a rectangular shape with four peripheral wall surfaces 2a to 2d. 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 is provided with a window 4 on one of the left and right peripheral wall surfaces 2b and 2c as shown in the figure. Extra length 5a of the optical fiber 5 from these windows 4
Is introduced into the extra length storage chamber 6 in the extra length storage case body 1,
The extra length portion 5a is looped as shown in the drawing with a bending radius of R in the extra length storage chamber 6.

Further, the peripheral wall surface 2d on the front surface of the peripheral wall 2 of the extra length storage case body 1 has a cylindrical connector adjacent to the peripheral wall surfaces 2c and 2b which are adjacent to each other when installed side by side as shown in the figure. The connection adapters 7 pass through and are attached respectively. In these connector connection adapters 7, the left and right optical fibers 5 having the extra length portion 5a are connected by other optical fibers 8 and 9 in a plug-in form. These optical fibers 8 and 9 are also bent with a bending radius of R.

[0005]

Such an optical fiber extra length storage case needs to have a bending radius R of, for example, 30 mm or more in order to prevent an increase in loss due to bending of the optical fibers 5, 8 and 9. If the optical fiber extra length storage case body 1 is formed while ensuring such a bending radius R, there is a problem that the optical fiber extra length storage case becomes large.

In order to avoid this, the peripheral wall surfaces 2 of the adjacent optical fiber extra length storage case bodies 1 adjacent to each other in FIG.
It is conceivable that the connector connection adapter 7 is provided on the c and 2b and the connector is connected by the optical fiber 8 between the adjacent peripheral wall surfaces 2c and 2b. There is a problem that it is difficult to see and connection workability deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical fiber extra length storage case which has a good connection workability and which can reduce the size of the extra length storage case body.

[0008]

According to the present invention, in the conventional optical fiber extra length storage case shown in FIG.
The cross-hatched portion 10 between the curved optical fiber 9 and the optical fiber extra length storage case body 1 is a dead space.

That is, the structure of the present invention which achieves the above-mentioned object will be described. In the present invention, a connector connection adapter is attached to a part of at least one peripheral wall surface of an optical fiber extra length storage case body having a rectangular peripheral wall. In the extra optical fiber extra length storage case, a portion of the peripheral wall surface to which the connector connection adapter is attached, on which the connector connection adapter is not attached, is projected outwardly in a convex shape.

[0010]

As described above, when the portion of the peripheral wall surface of the main body of the optical fiber extra length storage case to which the connector connection adapter is attached, where the connector connection adapter is not attached, is projected outwardly, the peripheral wall surface is The portion projecting outward in a convex shape is a portion that has not been conventionally used as a dead space, and the dead space can be effectively used.

That is, when the portion of the peripheral wall surface to which the connector connection adapter is not attached is projected outwardly in a convex shape, the extra length storage chamber in the extra length storage case body is widened accordingly. Therefore, even if the extra length storage case main body is miniaturized, it is possible to store the optical fiber in a circle while ensuring the bending radius R, and it is possible to reduce the size of the optical fiber extra length storage case.

Further, since the connector connecting adapter is provided on the front surface of the peripheral wall, the connecting work of the optical fiber is the connecting work from the front side, so that the connecting workability is also good.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. The parts corresponding to those in FIG. 3 described above are designated by the same reference numerals.

FIG. 1 shows one embodiment of an optical fiber extra length storage case according to the present invention. In the optical fiber extra length storage case of this embodiment, the portion 2dt of the optical fiber extra length storage case body 1 where the connector connection adapter 7 of the peripheral wall 2 is attached and the connector connection adapter 7 of the peripheral wall 2d is not attached is bent. It is characterized in that it is outwardly curved with a radius R.

As described above, when the portion 2dt of the peripheral wall surface 2d of the optical fiber extra length storage case body 1 to which the connector connection adapter 7 is attached and where the connector connection adapter 7 is not attached is curved outwardly in a convex shape, This peripheral wall 2d
The portion 2dt protruding outwardly in a convex shape is a portion that has not been conventionally used as a dead space. By providing the portion 2dt in which the peripheral wall surface 2d projects outward in a convex shape in this manner, the extra length storage chamber 6 in the extra length storage case body 1 becomes wider accordingly. Therefore, even if the extra length storage case body 1 is miniaturized, the optical fiber extra length portion 5a with the bending radius R secured can be stored in a circle, and the optical fiber extra length storage case can be miniaturized. That is, according to the optical fiber extra length storage case of the present invention, it is possible to effectively utilize the dead space.

Further, since the tubular connector connection adapter 7 is provided on the front surface of the peripheral wall 2, the plug-in type connection work of the optical fibers 8 and 9 is the connection work from the front side, and therefore the connection workability is also improved. Good.

The portion 2dt of the peripheral wall surface 2d projecting outwardly in a convex shape is not limited to a curved arc shape as shown in the figure, but may be a square shape such as a square shape. Good.

[0018]

As described above, in the optical fiber extra length storage case according to the present invention, the portion of the peripheral wall surface to which the connector connection adapter of the optical fiber extra length storage case body is attached, to which the connector connection adapter is not attached. Since the convex portion is projected outward, the extra length storage chamber in the extra length storage case body is widened by that amount. Therefore, even if the extra length storage case body is downsized, an optical fiber with a bending radius R is secured. It is possible to store in a circle, and the optical fiber extra length storage case can be downsized. In particular, the portion where the peripheral wall projects outwardly in a convex shape is a portion that has not been conventionally used as a dead space, and the dead space can be effectively used. Further, since the connector connecting adapter is provided on the front surface of the peripheral wall, the connecting work of the optical fiber is a connecting work from the front side, and therefore there is an advantage that the connecting workability is also good.

[Brief description of drawings]

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

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

FIG. 3 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 to 2d peripheral wall surface 2dt part where connector connection adapter is not attached 3 bottom plate 4 window 5 optical fiber 5a extra length part 6 extra length storage chamber 7 connector connection adapter 8, 9 optical fiber

Front page continuation (72) Inventor Shuichi Sugita 5-23-8 Nishigotanda, Shinagawa-ku, Tokyo Incorporated by Seiden Co., Ltd. Incorporated (72) Inventor Akira Sugawara 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (1)

[Claims] 1. An optical fiber extra length storage case in which a connector connection adapter is attached to a part of at least one peripheral wall surface of an optical fiber extra length storage case body having a rectangular peripheral wall, wherein the connector connection adapter is attached. An optical fiber extra length storage case, characterized in that a portion of the peripheral wall surface to which the connector connection adapter is not attached is projected outwardly in a convex shape.