JP2000221371A - Optical fiber cord, connector and optical fiber cord with connector - Google Patents

Abstract

(57) [Problem] To provide an optical fiber cord and a connector which can easily prevent an increase in loss or damage even when a sudden tensile force or bending force is applied. SOLUTION: An optical fiber main body 11a is covered with a protective coating 11b.
The optical fiber cord 11 enclosed by the optical fiber cord 10 is inserted into a spiral outer casing 13 made of an elastic material such as resin or rubber so as to have a gap.
Was configured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cord, a connector, and an optical fiber cord with a connector.

[0002]

2. Description of the Related Art For example, a single-mode glass optical fiber cord for communication has been conventionally used as shown in FIG.
An optical fiber core 111 in which an optical fiber main body 111a is surrounded by a protective coating 111b is surrounded by a tensile strength member 112, and this is further surrounded by a sheath 113. In such an optical fiber cord 110, by adjusting the amount of the strength member 112, even if a tension of 10 kg is applied to the outer casing 113, the elongation can be suppressed to about 0.5%.

In addition, the optical fiber cord 1 as described above
10 type SC connector (JIS-F
Type 04) comprises a plug 210, a boot 220, and an adapter 230, as shown in FIG.

[0004] As shown in FIG. 20, a plug 210 is provided with a ferrule 2 at an inner end of a cylindrical frame 211.
Numeral 12 is provided so as to be slidable along the axial direction, and a compression coil spring 213 is provided between the frame 211 and the ferrule 212 so that the tip of the ferrule 212 projects from the frame 211. The distal end side of the ferrule 212 has a protective coating 111b,
2. The optical fiber main body 111a of the optical fiber cord 110 from which the exterior 113 has been removed is fixedly held. The base end side of the ferrule 212 firmly holds the optical fiber core 111 of the optical fiber cord 110 from which the tensile strength member 112 and the sheath 113 have been removed. The base end side of the frame 211 holds the strength member 112 of the optical fiber cord 110 by a caulking member 214.
The optical fiber cord 110 is fixedly held by the caulking member 215 while the sheath 113 of the optical fiber cord 110 is fixed.

At the base end side of the frame 211 of the plug 210, a boot 22 made of a flexible material such as resin or rubber and having a plurality of slits 220a formed in the outer peripheral surface along the circumferential direction.
0 is linked. The boot 220 is connected to the plug 21
0 surrounds the end of the optical fiber cord 110 protruding from the base end of the frame 211.

[0006] The adapter 230 has a sleeve 232 provided coaxially inside a cylindrical frame 231. By inserting the tip of the plug 210 into one end of the frame 231, the sleeve 232 is connected to the sleeve 232.
32, the ferrule 212 of the plug 210 enters the inside of the sleeve 232, and the claw portion 231a of the frame 231 enters.
The plug 210 can be detachably held by engaging the projection 211a of the frame 211 of the plug 210 with the plug 210.

In such a connector, when plugs 210 are inserted into both ends of adapter 230, frame 231 of adapter 230 is inserted into frame 21 of plug 210.
1 and the sleeve 232 of the adapter 230.
Inside, the ferrule 212 of the plug 210 abuts and retreats, and the amount of retreat (about 0.5 mm) becomes a margin for elongation at the time of pulling. Further, even if a tensile force (10 kg or less) acts on the optical fiber cord 110, the engagement portion between the plug 210 and the adapter 230 is rigid so as not to be damaged, and stable optical characteristics can be maintained.

On the other hand, even if the optical fiber cord 110 is pulled so as to be bent in the radial direction, the boot 220 protects the optical fiber cord 110 from being sharply bent. For example, the loss due to the emission of communication light from the optical fiber main body 111a is reduced to 0.
It can be suppressed to 5 dB or less.

[0009]

However, the conventional optical fiber cord 110 and the connector as described above have the following problems.

(1) Since the optical fiber cord 110 has a structure that is hardly stretched by pulling, even if it is erroneously hooked during the laying operation and the like and a slight tension is applied, the tension is suddenly applied and instantaneously acts. When a force exceeding 10 kg is applied to the connector, not only may there be a problem in optical characteristics such as instantaneous interruption of a signal, but also in the worst case, the connector may be damaged. For this reason, the connector must be strengthened so as to withstand such a sudden tension, resulting in a complicated structure.

(2) When the bending force applied to the boot 220 exceeds 2 kg, the loss of the connector increases.
Therefore, the optical fiber cord 110 is laid so as not to be smaller than a predetermined radius of curvature. However, if the optical fiber cord 110 is erroneously hooked during the laying operation or the like, a bending force exceeding 2 kg is applied to the boot 220, and the loss increases.

Accordingly, the present invention provides an optical fiber cord, a connector, and an optical fiber cord with a connector that can easily prevent an increase in loss or damage even when a sudden tensile force or bending force is applied. Aimed to provide.

[0013]

An optical fiber cord according to a first aspect of the present invention for solving the above-mentioned problems has an optical fiber core having a gap inside a sheath which can be extended and contracted in the longitudinal direction. It is characterized by being inserted.

In the optical fiber cord according to the second aspect of the present invention, an optical fiber core is inserted with a gap into an exterior having a plurality of unit members that are bent and connected in a specified angle range. It is characterized by having.

An optical fiber cord according to a third aspect of the present invention has an optical fiber core inside a sheath comprising a plurality of unit members connected so as to be able to expand and contract along a longitudinal direction and bend within a prescribed angle range. The wire is inserted with a gap.

[0016] A connector according to a fourth aspect of the present invention is provided with a plug attached to an end of an optical fiber cord, an adapter connecting the plugs to connect the optical fiber cord, and a base end of the plug. And a boot surrounding the end of the optical fiber cord, wherein the boot has a gap with the optical fiber cord and is extendable and contractable in the longitudinal direction.

According to a fifth aspect of the present invention, there is provided a connector provided at a proximal end of the plug, a plug attached to an end of the optical fiber cord, an adapter connecting the plugs to connect the optical fiber cord. And a boot surrounding the end portion of the optical fiber cord, wherein the boot has a gap with the optical fiber cord and is connected to the unit so as to be bent in a defined angle range. It is characterized by comprising.

A connector according to a sixth aspect of the present invention is provided with a plug attached to an end of an optical fiber cord, an adapter for connecting the plugs to connect the optical fiber cord, and a connector provided on a proximal end side of the plug. And a boot surrounding the end of the optical fiber cord, the boot has a gap with the optical fiber cord, can expand and contract in the longitudinal direction, and can be bent within a defined angle range. And a plurality of unit members connected as described above.

An optical fiber cord with a connector according to a seventh aspect of the present invention includes a plug attached to an end of the optical fiber cord, an adapter connecting the plugs to connect the optical fiber cord, and a base end of the plug. An optical fiber cord with a connector having a connector provided with a boot provided on the side of the optical fiber cord and surrounding the end side of the optical fiber cord, wherein the optical fiber cord is any one of the first to third inventions. It is a code.

According to an eighth aspect of the present invention, there is provided an optical fiber cord with a connector, comprising: a plug attached to an end of the optical fiber cord; an adapter connecting the plugs to connect the optical fiber cord; and a base end of the plug. An optical fiber cord with a connector having a connector provided on the side thereof and a boot surrounding the end side of the optical fiber cord, wherein the connector is the connector according to any one of the fourth to sixth inventions. It is characterized by.

An optical fiber cord with a connector according to a ninth aspect of the present invention comprises a plug attached to an end of the optical fiber cord, an adapter connecting the plugs to connect the optical fiber cord, and a base end of the plug. An optical fiber cord with a connector having a connector provided with a boot provided on the side of the optical fiber cord and surrounding the end side of the optical fiber cord, wherein the optical fiber cord is any one of the first to third inventions. And a connector according to any one of the fourth to sixth aspects of the invention.

An optical fiber cord with a connector according to a tenth aspect of the present invention is the optical fiber cord with a connector according to any one of the seventh to ninth aspects, wherein the plug of the connector projects the tip end of the optical fiber cord. While supporting the optical fiber cord in a cantilever state, and the plug is connected to the adapter of the connector, the adapter bends at least one end of the optical fiber cord to provide an elastic restoring force. The optical fiber cord is connected while pressing the distal end side of the optical fiber cord.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical fiber cord according to the present invention,
Embodiments of a connector and an optical fiber cord with a connector will be described below, but the present invention is not limited to these embodiments.

[First Embodiment] A first embodiment of the present invention will be described with reference to FIG. FIG.
FIG. 2 is a schematic configuration diagram of the optical fiber cord.

As shown in FIG. 1, an optical fiber cord 10 according to the present embodiment has an optical fiber body 1 covered with a protective coating 11b.
The optical fiber core 11 surrounding the optical fiber 1a is formed into a spiral sheath 13 made of an elastic material such as resin or rubber.
Are inserted so as to have a gap inside. As shown in FIG. 2A, the armor 13 may be provided over the entire length of the optical fiber
As shown in (b) and (c), they may be provided only at necessary parts.

In such an optical fiber cord 10, if the cable is erroneously hooked during the laying operation and the tension is applied, as shown in FIG. 2 (a '), only the armor 13 extends in the longitudinal direction. Therefore, the tension applied to the optical fiber 11 becomes very small.

That is, when tension is applied to the conventional optical fiber cord, as shown by a dotted line in FIG. 3, although the tension rapidly rises with respect to the elongation, the tension is applied to the optical fiber cord 10 of the present embodiment. In this case, as shown by the solid line in FIG. 3, the rise of the tension becomes slower than the elongation.

The optical fiber cord 1 according to the present embodiment
At 0, if the outer casing 13 is fully extended, further applied tension acts on the optical fiber core wire 11, but the amount of extension is sufficient to cope with the tension that is erroneously applied in normal work. If the exterior 13 is designed as described above, no particular problem occurs.

Therefore, according to such an optical fiber cord 10, even if a sudden tensile force is applied, an increase in loss or damage can be easily prevented.

Further, since the sheath 13 is spiral, it can be easily provided by being wound around the optical fiber core 11 while rotating it.

Further, since the sheath 13 can be provided as described above, the sheath 13 can be easily provided even in a conventional optical fiber cord in which a tensile strength member or a sheath is provided on an optical fiber core. The same effects as those of the optical fiber cord 10 of the present embodiment can be obtained even with a conventional optical fiber cord already laid.

In this embodiment, the optical fiber cord 10 in which the optical fiber 11 is inserted inside the spiral sheath 13 has been described. For example, as shown in FIG. A tube 22 having a property is provided between the optical fiber core 11 and the sheath 13, the tube 22 is provided so as to surround the sheath 13, and as shown in FIG. An optical fiber core 11 is provided inside a bellows-shaped sheath 33 made of a material having such elasticity.
As shown in FIG. 4C, the ring 43a ₁ made of a material having elasticity or flexibility is inserted into the ring 43a.
A tube-like exterior 43 coaxially and alternately connected to ₂
By inserting the optical fiber core 11 into the inside of the device, it is possible to prevent dust from entering between the optical fiber core 11 and the outer casings 13, 33, 43. here,
In FIG. 4C, the outer diameters of the rings 43a ₁ and 43b ₂ are different, but rings having the same diameter can be used.

Also, in the present embodiment, the optical fiber core 11 is placed inside the spiral or bellows-like sheaths 13 and 33 or the tube-like sheath 43 made of an elastic material such as resin or rubber. Although the above effects can be obtained by inserting, for example, a spiral or bellows-like boot made of a stretchable material such as resin or rubber,
If a connector that uses a tube-shaped boot with a ring made of a material that has elasticity or flexibility is applied, it may be accidentally caught on the optical fiber cord during laying work, etc., causing a large tensile force to be applied to the connector boot. However, the increase in loss and damage can be easily prevented in the same manner as in the case of the optical fiber cord described above.

[Second Embodiment] A second embodiment of the present invention will be described with reference to FIG. FIG.
FIG. 2 is a schematic configuration diagram of the optical fiber cord. However, the same members as those in the first embodiment described above are denoted by the same reference numerals as those used in the description of the first embodiment, and description thereof is omitted.

As shown in FIG. 5, the optical fiber cord 50 according to the present embodiment has another unit inside the large diameter portion 53ab of the unit pipe 53a which is a unit member having a small diameter portion 53aa and a large diameter portion 53ab. Insert the small diameter portion 53aa of the pipe 53a so that the unit pipe 5
The optical fiber core wire 11 is inserted into the exterior 53 connecting a plurality of 3a with a gap.

In such an optical fiber cord 50, for example, when a tensile force is applied by being erroneously hooked during a laying operation or the like, as shown in FIGS. Of the large diameter portion 53ab of the other unit pipe 53a abuts the inner peripheral surface of the large diameter portion 53ab of the other unit pipe 53a.
Light can be bent only within a range that comes into contact with the outer peripheral surface of the small-diameter portion 53aa of 3a. That is, since the exterior 53 includes a plurality of unit pipes 53a that are connected to bend in a defined angle range, light The bending angle of the fiber core 11 is limited.

Here, the unit pipe 53a of the exterior 53
By adjusting the difference between the outer diameter of the small diameter portion 53aa and the inner diameter of the large diameter portion 53ab, the bendable range of the optical fiber 11 can be set arbitrarily. Specifically, for example, the total length of the unit pipe 53a of the exterior 53 is 9.2 mm,
The outer diameter of the small diameter portion 53aa is 3.5 mm, and the large diameter portion 53aa
b has an inner diameter of 3 mm, and the adjacent unit pipe 53a
By setting the maximum intersection angle between the axes of the optical fibers to 22.5 °, the minimum radius of curvature of the optical fiber 11 can be limited to 20 mm.

Therefore, according to such an optical fiber cord 50, as in the case of the above-described embodiment, even if a sudden tensile force or bending force is applied, an increase in loss or damage is easily prevented. be able to.

Further, for example, as shown in FIG. 7, a small-diameter portion 63aa and a large-diameter portion 63ab are provided, a flange portion 63ac is provided at an outer peripheral edge of the small-diameter portion 63aa, and an inner peripheral edge of the large-diameter portion 63ab. If the exterior 63 is used, in which a plurality of unit pipes 63a, which are unit members provided with claws 63ad, are connected to each other, the adjacent unit pipes 63a can be reliably connected to each other, so that the unit pipes 63a are reliably prevented from falling off. be able to.

[0040] In the present embodiment, the same shape of the unit pipe 53a, is used an exterior 53 and 63 according to the 63a, for example, as shown in FIG. 8, the large-diameter portion 73a ₁
The small-diameter portion 73a at both ends of the b has a small-diameter portion 73a ₁ a
A first unit pipe 73a ₁ having a flange portion 73a ₁ c on the outer peripheral edge of the ₁ a, the first unit pipe 73
second unit pipe 73 having a claw portion 73a ₂ d on both sides of the inner peripheral edge also forms a larger diameter than the small-diameter portion 73a ₁ a of a ₁
It is also possible to use an exterior 73 in which a plurality alternately connected and a _2. In this case, the first and second unit pipes constitute a unit member.

For example, as shown in FIG. 9, a hemispherical dome-shaped outer joint portion 83ad is provided at one end of a cylindrical tube portion 83aa.
a domed inner joint 83 having a hemispherical shape at the other end of the inner joint 83
A unit pipe 83a which is a unit member provided with ac
By using the exterior 83 in which a plurality of the unit pipes 83a are connected so that the inner joint 83ac of another unit pipe 83a is fitted to the outer joint 83ad, if a bending force is applied, one of the adjacent units The inner peripheral edge of the outer joint portion 83ad of the pipe 83a is the other unit pipe 8
The exterior 83 can be bent only within a range in which the exterior 83 abuts on the boundary between the inner joint 83ac and the tube 83aa, that is, a plurality of the exterior 83 that are flexibly connected within a defined angle range. Since the unit pipe 83a is provided, the bending angle of the optical fiber core 11 can be limited, and the same effect as in the case described above can be obtained.

For example, as shown in FIG. 10, a hemispherical portion 93ac is provided at one end of a cylindrical tube portion 93aa via a neck portion 93ab, and the other end portion of the tube portion 93aa is closer to the other end. A spherical portion 93ad having the same radius of curvature as the hemispherical portion 93ac is formed on the peripheral surface, and the tubular portion 93a is formed.
The hemispherical portion 93ac of the unit pipe 93a, which is a unit member having a tapered surface portion 93ae formed on the inner peripheral surface portion at the other end portion of the end portion a so as to become thinner toward the end portion, is replaced with a spherical portion 93ad of another unit pipe 93a. By using the exterior 93 in which a plurality of the unit pipes 93a are connected by being inserted so as to be fitted to the portions, when a bending force is applied,
The exterior 93 can be bent only within a range where the neck 93ab of the adjacent one unit pipe 93a abuts on the tapered surface 93ae of the other unit pipe 93a, that is, the exterior 93 can be bent within a defined angle range. Is provided, the bending angle of the optical fiber core 11 can be limited, and the same effect as in the case described above can be obtained.

In the present embodiment, the optical fiber core 11 is provided with a gap inside the exterior 53, 63, 73, 83, 93 in which a plurality of unit pipes 53a, 63a, 73a, 83a, 93a are connected. Although the above-mentioned effects can be obtained by inserting the unit pipe, for example, if a boot is formed by connecting a plurality of unit pipes as described above, the cable may be erroneously hooked on the optical fiber cord during laying work, etc. Even if a large bending force is applied to the boot, an increase in loss or damage can be easily prevented in the same manner as in the case of the optical fiber cord described above.

When a boot is constructed by connecting a plurality of unit pipes as described above, for example, as shown in FIG. 11, a unit pipe 63a whose overall diameter becomes smaller toward the distal end is used. preferable.

Third Embodiment A third embodiment of the present invention will be described with reference to FIG. FIG.
2 is a schematic configuration diagram of the optical fiber cord. However, the same members as those in the first and second embodiments described above are denoted by the same reference numerals as those used in the description of the first and second embodiments, and the description thereof is omitted. I do.

As shown in FIG. 12, an optical fiber cord 100 according to the present embodiment has a
A first unit pipe 103a ₁ having 03a ₁ c,
Than the first unit pipe 103a ₁ causes a plurality alternately connected and a second unit pipe 103a ₂ having a claw portion 103a ₂ d on both sides of the inner peripheral edge to form a large diameter,
Second unit pipe 10 as in the bellows-shaped unit tube 103a ₃ made of a material having elasticity such as resin or rubber covering the first unit pipe 103a ₁
An optical fiber core 11 is inserted into a sheath 103 connecting between 3a ₂ and the first and second unit pipes 103a ₁ and 103a ₂ , a unit tube 10
Constitute a unit member due 3a _3.

In such an optical fiber cord 100, for example, if it is erroneously hooked during a laying operation and a tensile force is applied, as shown in FIG.
3 first unit distance between the pipe 103a ₁ with the first unit pipe 103a ₁ so as to extend along with a second unit pipe 103a ₂ is slid along the longitudinal direction, the unit tubes 103a ₃ along the longitudinal direction The tension applied to the optical fiber core wire 11 becomes very small by extending and only the sheath 103 is extended.

When a bending force is applied, for example, FIG.
(B), the first unit flange portion 103a ₁ c of the pipe 103a ₁ the second unit pipe 103a
₂ and the second unit pipe 10
3a ₂ of the claw portion 103a ₂ d is first unit pipe 103
The first and second unit pipes 1 can be bent only within a range in contact with the outer peripheral surface of a ₁ , that is, the plurality of first and second unit pipes 1 that are connected so that the exterior 103 can be bent within a defined angle range.
Since it is provided with 03a ₁ , 103a ₂ and the unit tube 103a ₃ , the bending angle of the optical fiber 11 can be limited.

Therefore, according to such an optical fiber cord 100, as in the above-described embodiment,
Even if a sudden tensile or bending force is applied, an increase in loss or damage can be easily prevented.

In this embodiment, the first unit pipe 103a ₁ is formed by the bellows-shaped unit tube 103a ₃ .
Was constructed an exterior 103 and connecting the second unit pipe 103a ₂ together so as to cover, in place of the bellows unit tube 103a _3, for example, a material having stretchability such as resin or rubber A unit tube (having a structure similar to that of the outer casing 13 shown in FIG. 1) or a unit tube formed by connecting a plurality of rings made of a material having elasticity or flexibility (the outer tube 43 and the outer casing 43 shown in FIG. 4C). It is also possible to use a similar structure).

[0051] Further, in the present embodiment, the second unit pipe 103a causes the plurality connected with the first unit pipe 103a ₁ and a second unit pipe 103a ₂ alternately
Alternating was possible to obtain the above effect by surrounding the optical fiber 11 in the exterior 103 coupled between ₂ between the unit tubes 103a _3, for example, first, as described above, two unit pipe If a boot is constructed by connecting a plurality of second unit pipes to each other with a unit tube between unit pipes, the cable may be accidentally caught on the optical fiber cord during laying work, etc., and a large bending force etc. will be applied to the connector boot. Even in this case, an increase in loss or damage can be easily prevented in the same manner as in the case of the above-described optical fiber cord.

[Fourth Embodiment] A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 14 is a schematic diagram of a plug of the connector, FIG. 15 is a schematic diagram of a plug and a boot of the connector,
FIG. 16 is a schematic structural diagram of an adapter, a plug, and a boot of the connector, and FIG. 17 is an explanatory diagram of a connection state of the connector. However, for members similar to those of the above-described first to third embodiments, the same reference numerals as those used in the description of the above-described first to third embodiments will be used to omit the description. I do.

As shown in FIG. 14, an optical fiber cord 110 is inserted into a plug 201 having a rectangular tube shape. The plug 201 is fixedly held by an adhesive or a caulking mechanism so as to support the optical fiber cord 110 in a cantilever state. An optical fiber cord 1 exposing an optical fiber main body 111a (a protective layer is not required) coated with a thin protective layer (about 5 μm) from the tip of the plug 201.
The tip side of 10 slightly protrudes.

As shown in FIG. 15, the plug 201
A compression spring 202 is fixedly held on the mounting portion 201a so as to act along the longitudinal direction of the plug 201. The spring 202 has a claw portion 203 on the distal end side.
a of the plate-shaped locking member 203 having the
It is attached so that the longitudinal direction is directed to the longitudinal direction of.

As shown in FIG. 16, a boot 204 having the same structure as the exterior 103 described in the third embodiment is attached to the base end side of the plug 201.

As shown in FIGS. 16 and 17, the plug 2
A rectangular tube-shaped connecting portion 205b having a size that can be inserted into the plug 201 is provided inside the rectangular tube-shaped adapter 205 having a size into which the 01 can be inserted. The connecting portion 205b includes the plug 201
A through hole 205c having a tapered shape is formed so as to have a smaller diameter toward the center in the longitudinal direction. On the side surface of the adapter 205, a protrusion 205a that can be engaged with the claw 203a of the lock member 203 is formed.

In such a connector, when plugs 201 are respectively inserted from both sides of the adapter 205,
As shown in FIG. 16, the claw portion 203a of the lock member 203
Engage with the projections 205a of the adapter 205, respectively.
Plugs 201 are fixed to adapters 205, respectively.
At this time, inside the adapter 205, as shown in FIG. 17, the tips of the plugs 201 come into contact with each other, and the optical fiber main body 111 on the tip side of the optical fiber cord 110.
a is the through hole 205c of the connecting portion 205b of the adapter 205
Since the optical fiber main body 111a is bent and supported inside, the optical fiber main body 111a is bent, and the ends thereof are pressed against each other by the elastic restoring force to be connected.

Here, as shown in FIG. 17, the length of the support of the optical fiber cord 110 of one plug 201 is shorter than the length of the support of the optical fiber cord 110 of the other plug 201. Then, the other plug 20
Only the first optical fiber main body 111a is bent, so that loss due to bending of the optical fiber main body 111a can be suppressed and mechanical reliability can be improved.

For example, if the length of the flexure of the optical fiber body 111a is 7 mm, the optical fiber
Since the elastic force (called the buckling force, which is determined by the above-mentioned length) of 11a is about 70 g, the optical fiber main body 111
By polishing, cleaving, or chamfering the distal end surface of the optical fiber body a, the distal end surfaces of the optical fiber main bodies 111a can be easily brought into close contact with each other, and a low-reflection optical connection can be obtained. Specifically, for example, when the projection length of the optical fiber main body 111a from the tip of the plug 201 is 50 μm, the optical fiber main body 111a is bent by about 0.3 mm, and the radiation loss at this time is suppressed to 0.1 dB or less. Become like Also, it gives only a sufficiently small bend with respect to breakage. For a single mode optical fiber having an outer diameter of 125 μm, the through hole 2 of the connecting portion 205b of the adapter 205 is used.
If the diameter of 05c is 126 μm, the loss is 0.3 dB.
Hereinafter, the return loss can be set to 50 dB or more, and good optical characteristics can be obtained.

Such a connector requires only pressing the optical fiber main body 110a as compared with the above-described conventional SC type connector using a ferrule. For this reason, the pressing force of the conventional SC type connector is 1 kg, whereas the pressing force of the connector is only 70 g, which is very small, so that the connecting force between the plug 201 and the connector 205 can be reduced. It is sufficient even if the strength of the connector is small.

Therefore, starting with the boot 204,
By attaching the above-described connector to which various boots as described in the above-described embodiment are applied to the various optical fiber cords in the above-described embodiment, stable optical characteristics against tensile force and bending force can be obtained. Can be obtained.

Therefore, according to such an optical fiber cord with a connector, even if a sudden tensile force or bending force is applied, an increase in loss or damage can be easily prevented.

[0063]

According to the optical fiber cord, connector and optical fiber cord with connector according to the present invention, even if a sudden tensile force or bending force is applied, an increase in loss or damage can be easily prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an optical fiber cord according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of an attached state of an exterior in the optical fiber cord of FIG.

FIG. 3 is a graph showing a relationship between elongation and tension of the optical fiber cord of FIG. 1 and a conventional optical fiber cord.

FIG. 4 is a schematic configuration diagram of another example of the optical fiber cord according to the first embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of an optical fiber cord according to a second embodiment of the present invention.

FIG. 6 is an operation explanatory view of the optical fiber cord of FIG. 5;

FIG. 7 is a schematic configuration diagram of another example of the optical fiber cord according to the second embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of another example of the optical fiber cord according to the second embodiment of the present invention.

FIG. 9 is a schematic configuration diagram of another example of the optical fiber cord according to the second embodiment of the present invention.

FIG. 10 is a schematic configuration diagram of another example of the optical fiber cord according to the second embodiment of the present invention.

FIG. 11 is a schematic configuration diagram of a boot of the connector according to the second embodiment of the present invention.

FIG. 12 is a schematic configuration diagram of an optical fiber cord according to a third embodiment of the present invention.

FIG. 13 is a diagram illustrating the operation of the optical fiber cord of FIG.

FIG. 14 is a schematic configuration diagram of a plug of a connector according to a fourth embodiment of the present invention.

FIG. 15 is a schematic configuration diagram of a plug and a boot of a connector according to a fourth embodiment of the present invention.

FIG. 16 is a schematic configuration diagram of a plug, a boot, and an adapter of a connector according to a fourth embodiment of the present invention.

FIG. 17 is an explanatory diagram of a connection state of a connector according to a fourth embodiment of the present invention.

FIG. 18 is a schematic configuration diagram of a conventional optical fiber cord.

FIG. 19 is a schematic configuration diagram of a conventional connector.

FIG. 20 is a sectional view of the connector of FIG. 19;

[Explanation of symbols]

10, 20, 30, 40, 50, 60, 70, 80, 9
0,100,110 Optical fiber cord 11,111 Optical fiber cord 11a, 111a Optical fiber main body 11b, 111b Protective coating 13,33,43,53,63,73,83,93,1
03 outer 22 tubes 43a _1, 43a ₂ rings 53a, 63a, 83a, 93a unit pipe 53aa, 63aa, 73a ₁ a small diameter portion 53ab, 63ab, 73a ₁ b larger diameter portion _{63ac, 73a 1 c, 103a 1} c flange portion 63ad , 73a ₂ d, 103a ₂ d claw portions 73a _1, 103a ₁ first unit pipe 73a _2, 103a ₂ second unit pipe 83 aa, 93aa pipe section 83ac intraarticular portion 83ad outside the joint portion 93ab neck 93ac hemisphere 93ad spherical portion 93ae Tapered surface 103ac Unit tube 201 Plug 201a Attachment 202 Spring 203 Lock member 203a Claw 204 Boot 205 Adapter 205a Projection 205b Connection 205c Through hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takushi Yoshida 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Makoto Sumita 3-192-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Nippon Telegraph and Telephone Corporation F-term (reference) 2H036 QA31 QA46 QA57 2H050 BA05 BC11

Claims (10)

[Claims] 1. An optical fiber cord, wherein an optical fiber cord is inserted with a gap inside a sheath that can be extended and contracted along a longitudinal direction. 2. An optical fiber, wherein an optical fiber core wire is inserted with a gap inside a sheath comprising a plurality of unit members connected to bendable within a prescribed angle range. code. 3. An optical fiber core wire is inserted with a gap inside a sheath comprising a plurality of unit members connected so as to be able to expand and contract along a longitudinal direction and bend in a prescribed angle range. An optical fiber cord, characterized in that: 4. A plug attached to an end of the optical fiber cord, an adapter for connecting the plugs to connect the optical fiber cord, and an end provided on a base end side of the plug for the end of the optical fiber cord. A connector comprising: a boot enclosing a part side; wherein the boot has a gap with the optical fiber cord and is extendable and contractable in a longitudinal direction. 5. A plug attached to an end of an optical fiber cord, an adapter for connecting the plugs to connect the optical fiber cord, and an end provided on a proximal end side of the plug for the end of the optical fiber cord. A connector surrounding the optical fiber cord, wherein the boot includes a plurality of unit members having a gap with the optical fiber cord and connected to bendable within a specified angle range. And connectors. 6. A plug attached to an end of the optical fiber cord, an adapter for connecting the plugs to connect the optical fiber cord, and an end provided on a base end side of the plug for the optical fiber cord. And a boot surrounding the part side, wherein the boot has a gap with the optical fiber cord, and is capable of extending and contracting along the longitudinal direction and connected so as to be able to bend in a defined angle range. A connector comprising a unit member. 7. A plug attached to an end of an optical fiber cord, an adapter for connecting the plugs to connect the optical fiber cord, and an end provided on a base end side of the plug for the end of the optical fiber cord. 2. An optical fiber cord with a connector having a connector comprising: a boot enclosing a part side;
4. An optical fiber cord with a connector, which is the optical fiber cord according to any one of items 1 to 3. 8. A plug attached to an end of the optical fiber cord, an adapter for connecting the plugs to connect the optical fiber cord, and an end provided on a base end side of the plug for the end of the optical fiber cord. 7. An optical fiber cord with a connector having a connector comprising a boot surrounding the part side, wherein the connector is the connector according to any one of claims 4 to 6. 9. A plug attached to an end of the optical fiber cord, an adapter for connecting the plugs to connect the optical fiber cord, and an end provided on the base end side of the plug for the end of the optical fiber cord. 2. An optical fiber cord with a connector having a connector comprising: a boot enclosing a part side;
An optical fiber cord with a connector according to any one of claims 1 to 3, wherein the connector is the connector according to any one of claims 4 to 6. 10. The optical fiber cord with a connector according to claim 7, wherein the plug of the connector projects the optical fiber cord in a cantilever state while projecting a distal end side of the optical fiber cord. Supporting, the plug is connected to the adapter of the connector, the adapter bends the distal end side of the optical fiber cord on at least one side and presses the distal end side of the optical fiber cord by elastic restoring force. An optical fiber cord with a connector, wherein the optical fiber cord is connected to the optical fiber cord.