JP5079287B2 - Short extra length fusion splice housing member - Google Patents

Description

The present invention relates to various optical fiber cables (for example, a round optical fiber cable such as a slot-type optical fiber cable, an optical fiber cable having a structure in which an optical fiber such as an optical drop cable is embedded in an outer sheath, and an optical fiber cord). concerning the the short surplus length fusion splice housing member for housing the fusion splice between the optical fibers.

Conventionally, in a technique of connecting optical fiber cables by fusing together optical fibers of an optical fiber cable, it is usual to secure an extra connection length and an extra work length in the optical fiber. After the connection work is completed, the surplus length is subjected to bending processing and stored in a tray or the like (for example, Patent Documents 1 and 2).
Japanese Patent Laid-Open No. 2001-042162 JP 2003-230216 A

However, the work of curving the extra length and storing it in the tray has to be performed carefully taking care of disconnection or the like, and therefore it takes time and effort.
In addition, in optical connection boxes such as closures and distribution boxes, separate mechanisms with completely different functions and structures, a tray for storing extra length and a fixing part for holding and fixing optical fiber cables, are installed. It was necessary to secure the space and store it in the outer case, which caused an increase in size.

The present invention has been made in view of the above-mentioned problems, and can eliminate or greatly reduce the labor of extra length processing work required for storing and protecting the fusion splicing portion, and also saves space and saves the optical fiber cable. It can be realized housing of the fusion splicing part of optical fibers of, are intended to provide a short surplus length fusion splice housing member.

In order to solve the above problems, the present invention provides the following configuration.
According to a first aspect of the present invention, there is provided a short surplus length fusion fusion housing a fusion splicing portion between an optical fiber led out at a tip of an optical fiber cable and an optical fiber led out at a tip of an optical drop cable branched from the optical fiber cable. A connecting portion housing member for fitting and fixing a cable holding fixing portion for holding and fixing the optical fiber cable, a fusion holder portion for holding the fusion connecting portion, and a tip portion of the optical drop cable. A base member having an elongated plate shape such that the fusion holder portion is disposed between the cable gripping fixing portion and the jacket fitting fixing portion. The strength members are fixed to the base member and secured to the base member, and the strength members are installed in the longitudinal direction of the base member so as to be separated from each other in the longitudinal direction. A connection unit provided with a portion is housed in a protection member, and the connection unit is connected to the protection member from the side opposite to the optical fiber of the optical fiber cable drawn into the protection member and the optical fiber cable. The fusion connection portion with the optical fiber of the drawn optical drop cable is held in the fusion holder portion, and the optical fibers connected to each other at the fusion connection portion are the base member. The cable gripping and fixing portion is a portion where a cable abutting surface on which the tip end portion of the optical fiber cable abuts is formed on the base member; A ring-shaped fixing member into which the tip of the optical fiber cable abutted against the cable abutting portion is inserted, and the cable abutting portion of the ring-shaped fixing member. A wedge member inserted into a gap secured between the cable abutting portion and a portion protruding to the opposite side of the cable abutting surface, and by pushing the wedge member into the gap A short extra length fusion splicing portion accommodating member is provided , wherein a tip end portion of the optical fiber cable is fixed to the cable abutting portion .
The second invention, and the fuser holder section and the tension member fixing portion, the first short of the invention, characterized in that are provided at positions shifted from each other in a longitudinal direction relative to the base member An extra length fusion splicing part accommodating member is provided.
According to a third aspect of the present invention, in the connection unit, a fusion connection part holding member including the fusion holder part and the jacket fitting fixing part is attached to the base member, and the fusion connection part The holding member includes a substrate portion, the fusion holder portion that holds the fusion splicing portion by a plurality of gripping protrusions that protrude from the upper surface of the substrate portion, and a protruding wall that protrudes from the substrate portion. The short extra length fusion splicing portion accommodating member according to the first or second aspect of the invention is characterized in that the outer covering fitting fixing portion in which the fitting groove is secured is provided.
According to a fourth aspect of the present invention, the optical drop cable includes an optical element portion in which an optical fiber is embedded in a resin sheath, and a support line portion attached to a side portion of the optical element portion. The optical element portion and the support wire portion at the distal end portion of the optical drop cable are drawn into the protective member in a state where they are separated from each other, and the cable holding and fixing of the base member of the connection unit is performed. A support wire fixing portion for fixing the support wire portion drawn into the protective member, and a tension member fixing portion for fixing the tension member of the optical fiber cable. The short surplus length fusion splicing portion accommodating member according to any one of the first to third aspects is provided.
5th invention is a waterproof sheet-like member which provided the adhesion layer in the single side | surface of the flexible sheet | seat base material, The invention of any one of 1st- 4th characterized by the above-mentioned. A short extra length fusion splicing part accommodating member is provided.
According to a sixth aspect of the present invention, the protective member is a waterproof sheet, and a hard exterior protective case that covers the waterproof sheet is attached as a protective member provided on the outer side of the waterproof sheet. The short surplus fusion splicing portion accommodating member according to any one of the first to fifth aspects, wherein the entire waterproof sheet is accommodated.

Connection unit according to the present invention, together with a fusion splicing part of optical fibers which are lead-out to the tip of the optical fiber cable, also the tip of the optical fiber cables connected to each other by fusion splicing of optical fibers, held together To do.
Connection unit described above can hold the tip of the optical fiber cables connected to each other by fusion splicing between fiber, the state of being opposed on both sides through a fusion holder. For this reason, when holding the fusion spliced portion formed by shortening the extra length of the spliced connection between the optical fibers of the optical fiber cable, it is exposed at the end of the optical fiber cable and cascaded at the spliced spliced portion. is the optical fiber became human connections with over between optical fiber cables which are held on both sides through a fusion holder can be wired to pass pull connection unit.
If the fusion splicing is performed with a short extra length, the extra length processing work after the connection can be omitted or simplified. However, since the extra length is short, the fusion splicing portion and the optical fiber cables on both sides of the fusion splicing portion are connected. There are restrictions on the positional relationship with the distal end portion and the positional relationship between the distal end portions of the optical fiber cables on both sides of the fusion splicing portion. In addition, in fusion splicing with a short extra length, the fusion splicing portion and the tip of the optical fiber cable are close to each other. In the configuration in which the extra-length storage tool and the fixing portion are placed close to each other, the extra-length storage work and the work of fixing the optical fiber cable are reduced.
However, according to the present invention, the connection unit, together with the fusion splice, even the tip of the optical fiber cables connected to each other by fusion splicing of the optical fibers, it holds together. Moreover, the optical fiber became cascaded with human connections at exposed the tip of the optical fiber cable fusion splice, over between optical fiber cables which are held on both sides through a fusion holder, connection unit It can be wired to pass pull the door. For this reason, inconveniences such as excessive bending of the optical fiber between the optical fiber cables held on both sides via the fusion holder portion can be reliably prevented.
Further, the function of holding the fusion-spliced portion, both a function of holding the optical fiber cable distal end portion which is drawn into the protective member, the long in connection unit described above, slack storage device and the optical fiber cable Compared to the configuration in which the fixing portion is separated, the fusion splicing portion can be held in a small space. The optical fiber became cascaded with human connection at the optical fiber is exposed at the tip of the cable fusion splice, over between optical fiber cables which are held on both sides through a fusion holder, the connection unit configuration capable wired as pull through can realize miniaturization of connection units, which contributes to space saving of the retention of the fusion splice.

Hereinafter, with the short surplus length fusion splice housing member embodying the present invention will be described with reference to the drawings.

(First Reference Example )
The short extra length fusion splicing part accommodation member and the fusion splicing part holding member of the first reference example will be described.
FIG. 1 is an overall perspective view showing an example of a short extra length fusion splicing portion accommodating member 1 (hereinafter sometimes abbreviated as a fusion splicing portion accommodating member), and FIG. FIGS. 3A and 3B are views showing a sheet 4 (protective member), in which FIG. 3A is an overall perspective view, FIG. 3B is an enlarged cross-sectional view, and FIG. FIG. 4 is a plan view showing a storage example of the optical drop cable 2 (optical fiber cable) and the fusion splicing part 3 in the fusion splicing part holding member 10, and FIG. 6 is an overall perspective view showing the structure of the connecting portion holding member 10, FIG. 6 is a view showing the structure of the fusion splicing portion holding member 10, (a) is a front view, (b) is a left side view, and (c) is a left side view. A right side view, (d) is a plan view.

In FIG. 1, a fusion splicing part accommodating member 1 is installed at a connection part between optical drop cables 2 and accommodates a fusion splicing part 3 between optical fibers of the optical drop cable 2.
As shown in FIG. 3, FIG. 4, etc., this fusion splicing part accommodating member 1 includes an optical fiber 2a (explained at the tip of an optical drop cable 2 (specifically, an optical element part 2d; see FIG. 3 etc.)). 3 and FIG. 4) the fusion splicing part holding member 10 that holds (specifically, holds and fixes) the splicing connection part 3 and the light that is connected to each other by the fusion splicing part accommodation member 1. A support wire coupler 20 for connecting the support wire portions 2f of the drop cable 2 and a protective member (here, specifically, encased so as to wrap around the fusion splicer holding member 10 and the support wire coupler 20). Comprises a waterproof sheet 4). Then, the fusion splicing portion holding member 10 that holds and fixes the splicing splicing portion 3 and the support wire coupler 20 that connects the support wire portions 2f of the optical drop cable 2 that are connected to each other are wrapped by the protective member. By storing in, the fusion splicing part 3 is stored and protected.

Here, the optical drop cable 2 will be described.
FIG. 7 shows an example of a cross-sectional structure of the optical drop cable 2.
In FIG. 7, an optical drop cable 2 is an optical element having a rectangular cross section in which an optical fiber 2a and a tensile body 2b vertically attached to both sides of the optical fiber 2a are embedded in a synthetic resin outer sheath 2c and collectively covered. 2d, and a supporting wire portion 2f in which a metal wire 2e attached (vertically attached) to a side portion of the optical element portion 2d is covered with the jacket 2c extending from the optical element portion 2d. .
The optical element portion 2d and the support wire portion 2f are connected via a thin portion 2g of the outer cover 2c. By cutting the thin portion 2g so as to be cut, the support wire portion 2f is cut into the optical element portion 2d. Can be separated from The support wire portion 2f functions as a support wire according to the present invention.
The optical fiber 2a is embedded in the central portion of the cross section of the optical element portion 2d, and the optical element portion 2d is divided into two notches 2h formed on both sides via the optical fiber 2a. By dividing into element halves, the optical fiber 2a can be exposed.

Here, the optical fiber 2a is an optical fiber, but may be, for example, a single-core optical fiber or a multi-core optical fiber tape. Further, the number of optical fibers 2a embedded in the jacket 2c is not limited to one (one optical fiber in the illustrated example), and may be plural.
The tensile body 2b is a flexible linear body, and the material thereof is, for example, FRP.
For example, a steel wire or the like is used as the metal wire 2e of the support wire portion 2f. However, the support wire portion 2f is not limited to the metal wire 2e used as the core material covered with the jacket 2c, and various materials such as an FRP wire material can be used as the core material.
The optical drop cable 2 is not limited to the above-described configuration, and may be any of various known configurations as long as the support line portion can be separated from the optical element portion.

FIG. 1 shows a case in which one optical drop cable 2 (reference numeral 2A may be used for distinction) and another two optical drop cables 2 (reference numerals 2B and 2C are used for distinction). An example of connecting a certain) is shown.
The tip portion of each optical drop cable 2 is disconnected from the optical element portion 2d and the support wire portion 2f.
As shown in FIGS. 1 and 3, the optical element portion 2 d and the support wire portion 2 f at the tip of each optical drop cable 2 are disposed on the inner side surrounded by the waterproof sheet 4 of the fusion splicing portion housing member 1. Are drawn from both sides while being separated from each other.
Note that the branching portion 2i of the optical drop cable 2 where the optical element portion 2d and the support wire portion 2f are separated is installed outside the fusion splicing portion accommodating member 1. Thereby, it is easy to secure the extra length of the optical element portion 2d as compared with the case where the branch portion 2i is provided in the fusion splicing portion accommodating member 1. The branch part 2i is protected by winding a protective tape or the like.

The support wire portion 2 f of each optical drop cable 2 drawn from both sides into the protective member (waterproof sheet 4) of the fusion splicing portion housing member 1 is connected by the support wire connector 20, so that tension is applied. As a result, the fusion splicing portion accommodating member 1 is provided straight along one straight line.
In FIG. 3, reference numeral 21 denotes a connection plate, and 22 denotes a fixing screw, both of which are components of the support wire connector 20.

In FIG. 4, an optical fiber 2a led out to the tip of the optical drop cable 2A (optical element portion 2d) (reference numeral 2aa may be used for distinction) is, for example, multi-core light such as two fibers or four fibers. It is a fiber tape core wire. On the other hand, the optical fiber 2a led out to the tip of the optical drop cables 2B and 2C (optical element portion 2d) (reference numerals 2ab and 2ac may be used for distinction) is a single-core optical fiber, It is a single-core optical fiber, such as a fiber strand.
The fusion splicing part 3 is a group of fusion splicing parts between two optical fibers 2ab and 2ac for one optical fiber 2aa using a reinforcing sleeve or the like.

Next, the fusion splicing part holding member 10 will be described.
In FIGS. 5 and 6A to 6C, description will be made with the upper side as the upper side and the lower side as the lower side.
As shown in FIGS. 4, 5, and 6, the fusion splicing portion holding member 10 includes an elongated plate-like substrate portion 11 and a jacket fitting fixing portion disposed at both longitudinal ends of the substrate portion 11. 12 and a fusion holder part 13 provided between the outer jacket fitting fixing parts 12 at both ends of the substrate part 11 and spaced from the outer jacket fitting fixing parts 12. Is formed.
Further, the fusion splicing portion holding member 10 is entirely an integrally molded product made of plastic.

  Reference numeral 14 in the figure denotes a side wall portion, which is erected on the substrate portion 11 from both ends in the width direction of the substrate portion 11. The side wall portion 14 is formed along the longitudinal direction of the substrate portion 11 at a portion between the outer jacket fitting fixing portions 12 at both ends in the longitudinal direction of the substrate portion 11. The space between the side wall portions 14 at both ends in the width direction of the substrate portion 11 functions as a fiber accommodation groove 10 a that accommodates the optical fiber 2 a and the fusion splicing portion 3 of the optical drop cable 2.

The outer cover fitting fixing part 12 is provided at the both ends in the longitudinal direction of the board part 11 between the projecting walls 12a projecting in parallel on the board part 11 and the optical element part 2d of the optical drop cable 2. The fitting groove 12b for fitting and fixing the tip portion is secured.
In the fusion splicing portion holding member 10 in the illustrated example, the fitting groove 12b of the outer jacket fitting fixing portion 12 (hereinafter, may be denoted by reference numeral 12A) on one side in the longitudinal direction (left side in FIG. 4) is one. The number of the fitting grooves 12b of each of the outer jacket fitting fixing portions 12 is two, although the number of the fitting grooves 12b of the outer jacket fitting fixing portion 12 (hereinafter may be denoted by reference numeral 12B) is two. It is not limited to.

  The optical element portion 2d of the optical drop cable 2 can be fitted into the fitting groove 12b so as to be pushed from above the fusion splicing portion holding member 10. The optical element portion 2d that is fitted is gripped between the protruding walls 12a on both sides of the fitting groove 12b. Further, the optical element portion 2d fitted in the fitting groove 12b has the demon 12c projecting on the inner surface of the fitting groove 12b (the side surface facing the fitting groove 12b of the protruding wall 12a) bites into the outer cover 2c, The fusion splicing portion holding member 10 is firmly held so as not to be displaced in the longitudinal direction.

The fusion holder part 13 detachably holds the fusion connection part 3 by a plurality of gripping projections 13 a provided on the upper surface 11 a of the substrate part 11.
In the fusion splicing part holding member 10 of the illustrated example, the fusing holder part 13 is configured to hold the fusion splicing part 3 between the gripping projections 13 a and the side wall part 14.

As shown in FIG. 4, in the fusion splicing portion holding member 10 of the illustrated example, the distal end portion of the optical element portion 2d of the optical drop cable 2A is inserted into the fitting groove 12b of the outer cover fitting fixing portion 12A on one side in the longitudinal direction. Are fitted and fixed, and the tip end portions of the optical element portions 2d of the optical drop cables 2B and 2C are fitted and fixed in the two fitting grooves 12b of the outer jacket fitting fixing portion 12B on the other side.
The fusion holder portion 13 includes optical fibers 2a that are led out to the tips of the optical element portions 2d that are fitted to the jacket fitting fixing portions 12A and 12B on both sides via the fusion holder portion 13, respectively. The fusion splicing part 3 is held.

The fusion splicing part holding member 10 is preferably applied to hold the splicing splicing part 3 between the optical fibers 2a having a short extra length that is less than 100 mm, for example.
When holding the fusion splicing portion 3 formed by fusion splicing with such a short extra length and the optical element portion 2d of each optical drop cable 2, as shown in FIG. The optical fibers 2 a connected to each other at the splicing connection portion 3 are disposed so as to extend on the upper surface 11 a of the substrate portion 11 along the longitudinal direction of the fusion splicing portion holding member 10.
As a result, it is possible to reliably prevent inconvenience such as excessive bending of the optical fiber 2a between the optical element portions 2d held on both sides via the fusion holder portion 13. It goes without saying that the extra length bending process of the optical fiber 2a is unnecessary.
The optical fibers 2 a connected to each other at the fusion splicing portion 3 are arranged to extend on the upper surface 11 a of the substrate portion 11 along the longitudinal direction of the fusion splicing portion holding member 10. 10, since it is not necessary to store the surplus length subjected to the bending process in the fusion splicing portion holding member 10, the fusion splicing portion holding member 10 can be reduced in size.

Further, if the above-mentioned fusion splicing portion holding member 10 has both the function of holding (gripping) the fusion splicing portion 13 and the function of holding (gripping) the optical element portion 2d, the extra length storage device and the light There is an advantage that the fusion splicing portion 3 can be held in a space-saving manner as compared with the conventional configuration in which the fixing portion of the fiber cable is separated.
Thereby, size reduction and cost reduction of the fusion splicing part accommodating member 1 as a whole can be easily realized.

As shown in FIG. 3, in the fusion splicing portion housing member 1, the support wire portions 2 f that are connected to each other by the support wire coupler 20 in the longitudinal direction (extending direction) of the fusion splicing portion holding member 10. The fusion splicing portion holding member 10 is accommodated in the extending direction (longitudinal direction).
The fusion splicing portion holding member 10 is disposed close to the support wire portion 2f so as to be along the support wire portion 2f.
Thereby, size reduction of the fusion splicing part accommodation member 1 is realizable.

The fusion splicing part accommodating member 1 is a waterproof sheet 4 after the connection of the support wire parts 2f and the fitting of the fusion splicing part 3 and the optical element part 2d to the fusion splicing part holding member 10 are completed. The support wire coupler 20 and the fusion splicing portion holding member 10 are assembled so as to be wrapped and stored.
As shown in FIG. 2B, the waterproof sheet 4 is obtained by providing an adhesive layer 42 on one side of a flexible sheet base 41 (surface layer) formed of, for example, EPDM vulcanized rubber or the like. . The adhesive layer 42 is preferably highly flexible in order to ensure adhesion to the support line portion 2f, the optical element portion 2d, etc., and for example, a layer formed of butyl rubber can be employed.

The waterproof sheet 4 is bent so that the adhesive layer 42 is on the inside, and the support wire coupler 20 and the fusion splicing portion holding member 10 are accommodated on the inner side. It is made to wind around the landing connection part holding member 10.
Further, the portions of the waterproof sheet 4 that are extended to the both sides in the longitudinal direction of the fusion splicing portion holding member 10 are bonded together, and end processing is performed by the bonded portions, and the support wire coupler 20 and the splicing connection are performed. The part holding member 10 is enclosed. Thereby, the waterproofness of the fusion splicing part holding member 10 and the support wire coupler 20 is ensured.
The support wire connector 20 and the fusion splicing part holding member 10 can be fixed at a desired position and in a desired direction by attaching the waterproof sheet 4 by the adhesiveness of the adhesive layer 42.
Further, in securing waterproofness using the waterproof sheet 4, the support wire part 2f and the optical element part 2d extending from both ends in the longitudinal direction of the fusion splicing part holding member 10 by the end treatment are also waterproof sheets. The four adhesive layers 42 are bonded to each other so as to be sandwiched between the waterproof sheets 4. Furthermore, since the adhesion of the adhesive layer 42 to the support line portion 2f and the optical element portion 2d is ensured by the flexibility of the adhesive layer 42, it is possible to ensure excellent waterproofness.
Moreover, the work for ensuring waterproofness is also easy.

FIG. 8 shows another example of a protective member for ensuring waterproofness.
In FIG. 8, the example which accommodated the fusion splicing part accommodation member 1 whole by the round pipe 5 (protective member) covered on the outer side of the waterproof sheet 4 of the above-mentioned fusion splicing part accommodation member 1 is shown.
Both ends in the central axis direction of the round pipe 5 are closed by a cap or the like in which a cable hole for passing an optical fiber cable introduced into the fusion splicing member housing member 1 is passed.
The round pipe 5 is a hard exterior protection case made of plastic or the like, and protects the fusion splicing part accommodating member 1 installed overhead from external force due to impact or strong wind.
The waterproof sheet used here does not necessarily need to be the above-described waterproof sheet 4 with the adhesive layer 42, and uses the waterproof sheet that does not include the adhesive layer 42 to hold the fusion splicing portion 3. It is also possible to ensure the waterproofness of the fusion splicing portion holding member 10.

In addition, as a protection member, it is not limited to the above-mentioned illustration, For example, the thing of various structures, such as a half sleeve which can be opened and closed, is employable.
Also in the first embodiment described later, a protective member having the same configuration as that exemplified in the first reference example can be employed.

(First Embodiment)
Next, a first embodiment of the present invention will be described.
FIG. 9 is a view showing the short surplus length fusion splicing portion accommodation member 51 and the connection unit 61 built in the short surplus length splicing connection portion accommodation member 51 according to the present embodiment, where (a) is a plan view and (b) is a front view. FIG.
Here, in FIG. 9B, description will be made with the upper side as the upper side and the lower side as the lower side.
In addition, about the component similar to a 1st reference example , a common code | symbol is attached | subjected and description is simplified or abbreviate | omitted.

As shown in FIG. 9, this short extra length fusion splicing portion accommodating member 51 is used for connecting a round optical fiber cable 52 (here, a slot-type optical fiber cable) and an optical drop cable 2, and an optical fiber. The fusion splicing portion 3 is accommodated between the optical fiber 52 a led out at the tip of the cable 52 and the optical fiber 2 a led out at the tip of the optical drop cable 2 branched from the optical fiber cable 52.
This short extra length fusion splicing portion accommodating member 51 has a configuration in which a connecting unit 61 to which the optical fiber cable 52, the optical drop cable 2, and the fusion splicing portion 3 are fixed is accommodated in a protective member 54.

  The connection unit 61 includes an elongated plate-like base member 62, a cable grip fixing portion 63 provided at one end in the longitudinal direction of the base member 62 (the left side in FIGS. 9A and 9B), and the base member 62. On the base member 62 between the fusion splicing portion holding member 10 attached on the base member 62 at the other end in the longitudinal direction, and between the cable gripping fixing portion 63 and the fusion splicing portion holding member 10. The supporting wire fixing part 64 and the tension member fixing part 65 are provided.

In the fusion splicing portion holding member 10, one outer jacket fitting fixing portion 12 </ b> A in the longitudinal direction is on the cable gripping fixing portion 63 side, and the other outer jacket fitting fixing portion 12 </ b> B is on the side opposite to the cable gripping fixing portion 63. It is fixed to the base member 62 with its longitudinal direction aligned with the base member 62.
The distal end portions of the optical element portions 2d of the optical drop cables 2B and 2C are fitted and fixed in the two fitting grooves 12b of the outer jacket fitting and fixing portion 12B opposite to the cable gripping and fixing portion 63.

Even in the short extra length fusion splicing portion accommodating member 51, the optical drop cable 2 is in a state in which the optical element portion 2d and the support wire portion 2f at the distal end portion of the optical drop cable 2 are separated from each other. Drawn inside.
The fusion holder portion 13 of the fusion splicing portion holding member 10 includes an optical fiber 52a led out to a tip end fixed to the cable gripping fixing portion 63 of the optical fiber cable 52, and optical elements of the optical drop cables 2B and 2C. The fusion splicing part 3 with the optical fibers 2ab and 2ac led out to the tip of the part 2d is fitted and fixed.
Here, the optical fiber 52a of the optical fiber cable 52 is a multi-core optical fiber ribbon, and the fusion splicing part 3 is a fusion of one optical fiber 52a and two optical fibers 2ab and 2ac. The connecting portions are gathered together using a reinforcing sleeve or the like.

The optical fiber 52a of the optical fiber cable 52 is wired from the optical fiber cable 52 along the longitudinal direction of the base member 62 on the upper surface 62a of the base member to the fusion splicing portion holding member 10, and further held by the splicing connection portion. It is passed through the fitting groove 12b formed in the outer sheath fitting fixing part 12A on the cable gripping fixing part 63 side of the member 10 to the fusion holder part 13 in the fiber accommodation groove 10a of the fusion connecting part holding member 10. It has reached the fusion splicing part 3 being held.
Therefore, in this connection unit 61, the optical fibers 52 a and 2 a connected to each other at the fusion splicing portion 3 are arranged so as to extend along the longitudinal direction of the base member 62.

The support line portion 2 f of the optical drop cable 2 is drawn to the support line fixing portion 64 along the base member 62, and the tip is fixed to the support line fixing portion 64.
9 (a) and 9 (b), reference numeral 64a is a fixing block for the support wire fixing portion 64, 64b is a fixing screw screwed to the fixing block 64a, and by tightening the fixing screw 64b, The support wire portion 2f inserted into the support wire insertion hole 64c of the fixing block 64a can be fixed.

The cable holding / fixing portion 63 is held and fixed so that the tip of the optical fiber cable 52 installed on one end in the longitudinal direction of the base member 62 (hereinafter referred to as the cable contact portion 62b) is pressed against the cable contact portion 62b. A ring-shaped fixing member 63a for fixing and a wedge member 63b for fixing work.
As shown in FIGS. 9A, 9B, and 10, the ring-shaped fixing member 63a includes a cable contact portion 62b and an upper surface of the cable contact portion 62b (hereinafter referred to as a cable contact surface 62c. The tip of the optical fiber cable 52 installed on a part) side of the upper surface 62a of the member 62 is provided so as to be accommodated inside.
Here, the ring-shaped fixing member 63a has a portion protruding on the side opposite to the cable contact surface 62c of the cable contact portion 62b, and a wedge member is provided between the protrusion portion and the cable contact portion 62b. A gap capable of press-fitting 63c is secured. Then, by pushing the wedge member 63c into the gap, the tip end portion of the optical fiber cable 52 is pressed against the cable contact portion 62b by the ring-shaped fixing member 63a, and the ring-shaped fixing member 63a and the cable contact portion 62b It is fixed to the base member 62 so as to be sandwiched between them.
At this time, the demons (not shown) projecting from the inner surface side of the ring fixing member 63a bite into the jacket of the optical fiber cable 52, so that the optical fiber cable 52 is connected to the base member 52. It is firmly fixed so as not to be displaced in the longitudinal direction.

The tension member 52 b of the optical fiber cable 52 is fixed by a tension member fixing portion 65.
9A and 9B, reference numeral 65a denotes a fixing block for the tension member fixing portion 65, and 65b denotes a fixing screw screwed to the fixing block 65a. By tightening the fixing screw 65b, The tension member 52b inserted into the support wire insertion hole 65c of the fixing block 65a can be fixed.

The support wire fixing portion 64 and the tension member fixing portion 65 can release the fixing of the support wire portion 2f and the tension member 52b by loosening the tightening of the fixing screws 64b and 65b.
Further, the cable gripping and fixing portion 63 holds the optical fiber cable 52 by pulling out the wedge member 63b press-fitted into the gap between the cable contact portion 62b and the ring-shaped fixing member 63a from the gap. Is resolved. At the same time, by releasing the fixation of the tension member 52b by the tension member fixing portion 65, the optical fiber cable 52 can be detached from the connection unit 61.

Also in this short extra length fusion splicing part accommodating member 51, as in the fusion splicing part accommodating member 1 of the first reference example , space saving and cost reduction of the fusion splicing part holding (accommodating) can be realized.
Further, the optical fibers 52 a and 2 a connected to each other at the fusion splicing portion 3 are arranged to extend along the longitudinal direction of the base member 62, and the support line portion 2 f of the optical drop cable 2 extends along the base member 62. Since the support wire portion 2f is disposed close to the base member 62, the connection unit 61 and the short extra length fusion splicing portion accommodating member 51 can be easily downsized.

Note that the connection unit does not necessarily have a structure assembled using the fusion splicing portion holding member 10.
The connection unit includes a cable gripping fixing portion, a fusion holder portion, and a jacket fitting fixing portion, and the fusion holder portion is disposed between the cable gripping fixing portion and the jacket fitting fixing portion. In this way, it is only necessary to have a configuration in which the position is shifted in the longitudinal direction of the base member on the elongated plate-like base member. It is also possible to install on a member.

( Second reference example )
Next, a second reference example of the present invention will be described.
This example is another aspect of the fusion splice holding member according to the present invention.
As shown in FIG. 11, the fusion splicing portion holding member 71 of this reference example is fixed to another member on both sides in the width direction of the substrate portion 11 of the fusion splicing portion holding member 10. An auxiliary mounting piece 72 for projecting is provided.
The fusion splicing portion holding member 71 including the attachment auxiliary piece 72 is an integrally molded product made of synthetic resin.

The auxiliary mounting piece 72 is a tongue-like plate-like protruding piece that protrudes from the side portions at both ends in the width direction of the substrate portion 11.
The auxiliary mounting piece 72 has a hole 72a for screwing the fusion splicing portion holding member 71 to a member such as a frame of an optical distribution board, a casing of an optical connection box, a wall of a building, or the like. ing.

Further, as shown in FIG. 12, the fusion splicing portion holding member 71 has an inner side of a coated tube 73a (outer jacket) of the optical fiber cord 73 in order to cope with the introduction of the optical fiber cord 73 (optical fiber cable). A tensile strength body fixing portion 74 is provided for fixing the tensile strength fibers 73b (strength strength body) housed therein.
The tensile strength fiber 73b is exposed so as to extend from the mouth of the optical fiber cord 73 (the tip of the covering tube 73a) with the lead-out operation of the optical fiber 73c accommodated in the optical fiber cord 73.
The tensile strength body fixing portion 74 holds the tensile strength fiber 73b by housing a caulking ring 75 made of metal fixed to the tensile strength fiber 73b exposed at the tip of the optical fiber cord 73.

The strength body fixing portions 74 are provided between the outer casing fitting fixing portions 12A and 12B at both ends in the longitudinal direction of the fusion splicing portion holding member 71.
In this tensile strength member fixing portion 74, the caulking ring 75 fixed to the tensile strength fiber 73b is fitted into a storage groove 74b between the gripping projection 74a and the side wall portion 14 protruding from the upper surface 11a of the substrate portion 11. It is designed to be stowed away.
The caulking rings 75 stored in the storage groove 74b protrude from the holding projections 74a and the side wall portions 14 on both sides of the storage groove 74b toward the storage groove 74b, and are separated from each other along the longitudinal direction of the fusion splicing portion holding member 71. The stopper projection 74c is housed between the two stopper projections 74c, and the stopper projection 74c restricts the movement of the fusion splicing portion holding member 71 in the longitudinal direction. Thereby, the tensile strength fibers 73b of the optical fiber cord 73 are fastened to the fusion splicing portion holding member 71, and movement of the optical fiber cord 73 from the fusion splicing portion holding member 71 can be restricted.

In addition, the tensile strength body fixing | fixed part 74 is also illustrated in explanatory drawing (for example, FIG. 4, FIG. 9 (a)) of the fusion splicing part holding member 10 which concerns on a 1st reference example and 1st Embodiment.
Further, the fusion splicing portion holding member 71 of this reference example can be handled in the same manner as the fusion splicing portion holding member 10 by cutting the auxiliary mounting piece 72.

It is a whole perspective view which shows an example of the short surplus length fusion splicing part accommodating member of the 1st reference example of this invention. It is a figure which shows the waterproof sheet (protection member) which comprises the short surplus length melt | fusion connection part accommodation member of FIG. 1, Comprising: (a) is a whole perspective view, (b) It is a cross-sectional enlarged view. It is a front view which shows the vicinity of the fusion splicing part holding | maintenance member and support wire coupling tool which are incorporated in the short extra length fusion splicing part accommodating member of FIG. It is a top view which shows the example of accommodation of the optical drop cable and fusion splicing part in the fusion splicing part holding member of FIG. It is a whole perspective view which shows the structure of the fusion splicing part holding member of FIG. It is a figure which shows the structure of the fusion splicing part holding member of FIG. 1, Comprising: (a) is a front view, (b) is a left view, (c) is a right view, (d) is a top view. It is a figure which shows an example of the cross-section of an optical drop cable. It is a figure which shows another aspect of the protection member of a short extra length melt | fusion connection part accommodating member. It is a figure which shows the short surplus length fusion splicing part accommodation member of 1st Embodiment of this invention, and the connection unit incorporated in this short surplus length fusion splicing part accommodation member, (a) is a top view, (b) is a front view. is there. It is sectional drawing which shows the structure of the cable holding | grip fixing | fixed part of the connection unit of FIG. It is a figure which shows the 2nd reference example of this invention, Comprising: It is a whole perspective view which shows a fusion splicing part holding member. It is a top view which shows the fusion splicing part holding member of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Short extra length fusion splicing part accommodation member, 2 ... Optical fiber cable (optical drop cable), 2a ... Optical fiber, 2c ... Outer sheath, 2d ... Optical element part, 2f ... Support line part, 3 ... Fusion splicing part, DESCRIPTION OF SYMBOLS 4 ... Protection member (waterproof sheet), 10 ... Fusion splicing part holding member, 11 ... Substrate part, 11a ... Upper surface, 12 ... Outer fitting fixing part, 12a ... Projection wall, 12b ... Insertion groove, 13 ... Fusion Holder part, 13a ... Grasping protrusion, 20 ... Support wire connector, 51 ... Short extra length fusion splicing part accommodating member, 52 ... Optical fiber cable (slot type optical fiber cable), 52a ... Optical fiber, 52b ... Tension member, 54 ... protecting member, 61 ... connecting unit, 62 ... base member, 62a ... upper surface, 62b ... cable abutment, 6 2 c ... cable abutment surface 64 ... support wire fixing portion, 65 ... tension member fixing portion, 71 ... Attaching and holding part 72, auxiliary piece for mounting, 72a ... hole, 73 ... optical fiber cable (optical fiber cord), 73a ... jacket (coated tube), 73b ... strength member (strength fiber), 73c ... optical fiber 74 ... Tensile strength fixing part.

Claims (6)

A short extra length fusion splicing portion accommodating member for accommodating a spliced splicing portion between an optical fiber led to the tip of an optical fiber cable and an optical fiber led to the tip of an optical drop cable branched from the optical fiber cable. And
An outer cover having a cable holding and fixing portion for holding and fixing the optical fiber cable, a fusion holder portion for holding the fusion connecting portion, and a fitting groove for fitting and fixing the tip portion of the optical drop cable. In the longitudinal direction of the base member, the fusion fixing portion is arranged so that the fusion holder portion is disposed between the cable gripping fixing portion and the jacket fitting fixing portion. A connection unit provided with a tensile strength body fixing portion that is installed separately from each other and is fixed to the base member with a tensile strength body that is vertically attached in the optical fiber cable is held in the protective member.
The connection unit is a fusion connection between the optical fiber of the optical fiber cable drawn into the protective member and the optical fiber of the optical drop cable drawn into the protective member from the side opposite to the optical fiber cable. The optical fiber connected to each other at the fusion splicing part is extended and arranged along the longitudinal direction of the base member ,
The cable gripping and fixing portion includes a cable abutting portion that is a portion where a cable abutting surface on which the tip end portion of the optical fiber cable abuts is formed on the base member, and the cable abutting portion abutted on the cable abutting portion. A ring-shaped fixing member into which the tip of the optical fiber cable is inserted, a portion of the ring-shaped fixing member that protrudes from the cable contact portion to the side opposite to the cable contact surface, and the cable contact portion And a wedge member inserted in a gap secured between the optical fiber cable and the tip of the optical fiber cable is fixed to the cable contact portion by pushing the wedge member into the gap. A short extra-long fusion splicing portion housing member, wherein: The short surplus length fusion splicing part accommodation according to claim 1 , wherein the fusion holder part and the strength member fixing part are provided at positions shifted from each other in the longitudinal direction with respect to the base member. Element. In the connection unit, a fusion connection part holding member including the fusion holder part and the outer cover fitting fixing part is attached to the base member,
The fusion splicing portion holding member protrudes on the substrate portion, the fusion holder portion that holds the fusion splicing portion by a plurality of gripping projections protruding on the upper surface of the substrate portion, and the substrate portion. The short surplus length fusion splicing part accommodating member according to claim 1 or 2 , further comprising: the outer cover fitting fixing part that secures the fitting groove between the provided protruding walls. The optical drop cable includes an optical element portion in which an optical fiber is embedded in a resin sheath, and a support line portion attached to a side portion of the optical element portion,
The protective member is drawn in a state where the optical element part and the support line part at the tip of the optical drop cable are separated from each other,
A support wire fixing portion for fixing the support wire portion drawn into the protection member between the cable gripping fixing portion and the fusion holder portion of the base member of the connection unit; and the optical fiber cable. The short surplus length fusion splicing part accommodating member according to any one of claims 1 to 3 , wherein a tension member fixing part for fixing the tension member is provided. The short surplus length fusion splicing according to any one of claims 1 to 4 , wherein the protection member is a waterproof sheet-like member in which an adhesive layer is provided on one surface of a flexible sheet base material. Part accommodating member. The protective member is a waterproof sheet, and a hard exterior protective case that covers the waterproof sheet is attached as a protective member provided on the outside of the waterproof sheet, and the entire waterproof sheet is stored in the exterior protective case The short extra-length fusion splicing part accommodation member according to any one of claims 1 to 5 .

Images