JPH0734045B2 - Optical fiber extra length storage case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to an optical fiber extra length storage case for storing an extra length of an optical fiber.

(Prior Art) When connecting an optical fiber, it is necessary to reserve a connection extra length for the optical fiber in consideration of reconnection or connection change at a later date. At this time, since the optical fiber is easily broken, it is necessary to protect it so as not to break it.

When the extra connection length of the optical fiber is stored in the optical fiber extra length storage case, the connection part of the optical fiber also needs to be fixed to the substrate of the case through the core connection holder. If each optical fiber connected to the core connecting part supported by the core connecting part holder wanders during use, there is a risk that it may break due to repeated bending fatigue at the boundary with the core connecting part.

To meet such demands, as a conventional optical fiber extra length storage case, a pair of bobbins is installed on the board, and the extra length of the optical fiber is wound around these bobbins in a figure 8 shape, common to both bobbins. There is proposed a structure in which a core wire connecting portion holder is provided at a position of a substrate on a tangent line contacting with (Japanese Patent Publication No. 56-39448).
issue).

However, in such a structure, since the two bobbins are provided on the substrate at a predetermined interval, the optical fiber extra length storage case becomes large, and there is a problem in that it may be difficult to secure the installation space. . Moreover, in such a structure,
Depending on the length of the extra length of the optical core line, when the extra length of the optical core line is wound around both bobbins in the shape of a figure 8 and a half end is generated, the extra length of the optical core line is loosened on the substrate. Then, there was a problem that it was entangled or bulged to other parts and damaged.

(Object of the Invention) An object of the present invention is to safely store the optical fiber without any problem even if the length of the extra length of the optical fiber is not constant. (EN) Provided is a compact and economical optical fiber extra length storage case capable of safely supporting connected optical fibers.

(Structure of the Invention) In the optical fiber extra length storage case according to the present invention, one bobbin having a radius equal to or larger than the minimum allowable bending radius of the optical fiber is installed on the substrate, and the outer circumference of the bobbin is provided with an extra fiber extra length. At least one pair of arc-shaped outer frames are erected on the substrate so as to be surrounded by the storage space, and a core wire winding storage groove is provided along the circumferential direction on the outer circumference of the outer frame, In the space where the circumferential ends of the outer frames face each other, a core wire connecting portion holder is arranged so as to be aligned on a straight line connecting the circumferential facing ends of the adjacent outer frames. And is supported by the substrate.

Thus, the structure in which one bobbin is supported on the substrate is smaller than the conventional type in which two bobbins are provided, and the installation space can be easily secured.

Further, when at least one pair of outer frames are erected on the substrate so as to surround the outer circumference of this one bobbin via the extra-fiber-core accommodation space, the extra length of the optical fiber wrapped around the bobbin is half When such a portion is generated, the extra length of the optical fiber with an odd length can be safely loosened and stored in the extra optical fiber length storage space between the bobbin and the outer frame.

Further, even if there is only one bobbin, at least one pair of outer frames are provided so as to surround the outer circumference of the bobbin, the core wire winding storage groove is provided on the outer circumference of the outer frame, and the outer circumferential direction of the outer frames is adjacent to each other. When the core connecting portion holder is arranged on the substrate in the space where the end portions face each other, the core connecting portion is supported by the core connecting portion holder, and both optical cores connected to the core connecting portion are external. It can be wound and stored in the core wire winding groove of the frame, so that the bobbin is
Even with the individual type, it is possible to safely support the optical fiber connection part and the optical fiber lines on both sides thereof.

In particular, in the present invention, since the outer frame is used as a means for supporting the optical core wire reaching the core wire connection portion, it is not necessary to install special core wire support means, and it can be economically implemented. Moreover, if the outer frame is also used as a winding means for the extra length, it becomes a coaxial double bobbin structure, and it is possible to further increase the accommodation length of the extra length while avoiding upsizing as much as possible. Is.

Further, according to the present invention, the optical fiber extra length storage case is miniaturized, the capacity of the optical fiber extra length is large, and the maintenance can be performed easily. It is very suitable when it is used in general households.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 7.

The optical fiber extra length storage case 1 of the present embodiment has a rectangular flat plate-shaped substrate 2, and one disc-shaped bobbin 3 is fixedly provided at the center of the surface of the substrate 2. There is. Bobbin 3
Is defined to have a radius equal to or larger than the minimum allowable bending radius of the optical fiber. On the upper part of the outer circumference of the bobbin 3 is a collar 4
Is projected.

A pair of arc-shaped outer frames 6 are projectingly provided on the substrate 2 so as to surround the outer circumference of the bobbin 3 via the extra core length accommodation space 5. In this embodiment, the height of the outer frame 6 is set lower than the height of the bobbin 3. Both ends 6A and 6B in the circumferential direction of both outer frames 6 are opposed to each other with a space 7 therebetween. The inner circumference of these outer frames 6 is about 2 times the outer circumference of the bobbin 3.
It is set to double. On the outer peripheral surface of each outer frame 6, a core winding storage groove 8 is formed over the entire length in the circumferential direction. The core winding storage groove 8 is formed in a shape having a narrow entrance and a wide interior.

A core wire connecting portion holder 9 is fixedly provided on the substrate 2 aligned on a straight line connecting the facing one ends 6A of the outer frames 6 to each other.

A rising plate 10 from the substrate 2 is provided in the space 7 on the side opposite to the side where the core wire connection portion holder 9 is provided. The rising plate 10 has a pair of insertion holes 11 formed therein.

The bobbin 3 is covered with a cover 12 having a length that straddles the outer frames 6 on both sides. Both ends in the length direction of the cover 12 are bent so that they can contact the upper end surface of the outer frame 6. On one side of the cover 12 in the width direction, a pair of insertion legs 13 are provided so as to correspond to the insertion holes 11 of the rising plate 10, and these insertion legs 13 are inserted into the insertion holes 11 of the rising plate 10. It is rare.

A hook piece 14 protruding toward the bobbin 3 is provided on the other side of the cover 12 in the width direction. On the bobbin 3, a hook locking groove 15 for locking the hook piece 14 is formed in a step shape.

On the side of the core wire connection holder 9, the core wire holders 16 are provided so as to project on the substrate 2 outside the outer frame 6. In these core wire holders 16, core wire locking grooves 17 are formed so that the inlet is narrow and the inner part is widened.

In such an optical fiber extra length storage case 1, the optical fiber extra lengths to be connected are passed over the outer frame 6 through the optical fiber locking grooves 17 of the optical fiber holders 16 to the bobbin 3 side. Guide each,
The bobbin 3 is stored by being wound around the outer circumference thereof.

In this case, if the extra length of the optical fiber is an integral multiple of the outer peripheral length of the bobbin 3, it can be housed by being closely attached to the outer periphery of the bobbin 3 and wound. In addition to the integral multiple of the circumference of the bobbin 3, when there is a marginal length less than the circumference, the outer frame 6 having an inner circumference of about twice the circumference of the bobbin 3 is obtained. It can be stored as a loop with slack in the extra core length storage space 5 surrounded by.

The portion of the optical fiber near the connecting portion of both optical fibers is separated from the bobbin 3 and stored in the optical fiber winding storage groove 8 on the outer periphery of the outer frame 6 and wound around the outer frame 6, and the optical fiber connecting portion is The core wire connection portion holder 9 is fitted and supported. Therefore, the optical fibers connected to both ends of the optical fiber connecting portion are accommodated and supported in the optical fiber winding accommodating groove 8 of the outer frame 6, so that the optical fibers may be staggered during use to give repeated bending fatigue. It is possible to prevent the optical fiber from being cut at both ends of the optical fiber connecting portion.

When the extra length of the optical fiber is stored, place the cover 12 on the bobbin 3 and both outer frames 6, insert the insertion leg 13 into the insertion hole 11 of the rising plate 10, and insert the hook piece 14 into the bobbin 3. Hook locking groove 15
It is fitted into and locked to prevent the extra length of the core wire from escaping.

(Effects of the Invention) As described above, according to the optical fiber extra length storage case according to the present invention, the following effects can be obtained.

(A) Since it has a structure in which one bobbin is supported on the substrate, it is smaller than the conventional type in which two bobbins are provided, and the installation space can be easily secured.

(B) Since at least one pair of outer frames are erected on the substrate so as to surround the outer circumference of this one bobbin via the extra core length accommodation space, it is possible to reduce the number of optical cores wound on the bobbin. When the extra length has an odd portion, the extra length of the optical fiber with the odd length can be safely loosened and accommodated in the optical fiber extra length storage space between the bobbin and the outer frame.

(C) Even if there is only one bobbin, at least one pair of outer frames are provided so as to surround the outer circumference thereof, and a core wire winding storage groove is provided on the outer circumference of the outer frame, and the outer circumferential direction of these outer frames is adjacent. Since the core wire connecting portion holder is disposed on the substrate in the space portion where the ends of the core wire connecting portion face each other, the core wire connecting portion is supported by the core wire connecting portion holder, and both optical fibers connected to the core wire connecting portion are supported. The core wire can be wound and stored in the core wire winding storage groove of the outer frame, and therefore, even if the type has only one bobbin, the core wire connection portion and the optical core wires on both sides thereof can be provided. Can be safely supported.

(D) In particular, in the present invention, since the outer frame is used as a means for supporting the optical core wire reaching the core wire connecting portion, it is not necessary to install the core wire support means specially and it can be economically implemented. You can

(E) When the outer frame is also used as the extra length winding means, a coaxial double bobbin structure is formed, and it is possible to further increase the accommodation length of the extra length while avoiding an increase in size as much as possible. Is.

(F) Since the optical fiber extra length storage case is downsized, the optical fiber extra length storage capacity is large, and maintenance is easy, so it is suitable for general households as the number of optical subscribers increases. It is very suitable for the popularization of.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the optical fiber extra length storage case according to the present invention, FIG. 2 is a transverse sectional view of FIG. 1, FIG. 3 is a side view of FIG. 1, and FIG. FIG. 5 is a cross-sectional view of FIG. 4 in the state where the cover of the embodiment of the optical fiber extra length storage case according to the present invention is removed, FIG. 6 is a cross-sectional view of FIG. FIG. 7 and FIG. 7 are views taken along the line YY of FIG. 1 ... Optical fiber extra length storage case, 2 ... Board, 3 ... Bobbin, 4
... Tsuba, 5 ... Extra core length storage space, 6 ... Outer frame, 7 ... Space part, 8 ... Core wire winding storage groove, 9 ... Core wire connection part holder, 10 ...
Standing plate, 11 ... insertion hole, 12 ... cover, 13 ... insertion leg, 14 ...
Hook piece, 15 ... Hook locking groove, 16 ... Core wire holder, 17 ... Core wire locking groove.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yoshio Tsuchida 6 Yawata Kaigan Dori, Ichihara-shi, Chiba Furukawa Electric Co., Ltd. Chiba Electric Wire Works (72) Inventor Yoshitaka Ishihara Tokai-mura, Naka-gun, Ibaraki Prefecture 162 Address: Nippon Telegraph and Telephone Public Corporation, Ibaraki Electro-Communications Research Laboratory (72) Inventor Hideo Kobayashi 162, Shirahane, Shirahoji, Tokai-mura, Naka-gun, Ibaraki Pref. JP-A-56-39448 (JP, A) JP-A-58-143308 (JP, A) JP-A-57-144511 (JP, A) Actually developed JP-A-58-126409 (JP, U)

Claims (1)

[Claims] 1. A bobbin having a radius equal to or larger than a minimum allowable bending radius of an optical fiber is installed on a substrate, and at least an arc shape is formed so as to surround the outer periphery of the bobbin via a space for accommodating a fiber extra length. A pair of outer frames are erected on the substrate, a core wire winding storage groove is provided along the circumferential direction on the outer periphery of the outer frame, and the circumferential ends of the adjacent outer frames face each other. In the space part, the core wire connecting part holder is arranged so as to be aligned on a straight line connecting the opposite ends in the circumferential direction of the adjacent outer frames, and is supported by the substrate. Optical fiber extra length storage case.