JP2003004997A - Optical fiber cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber cable which has an anti-shrinkage body for suppressing the shrinkage of a jacket made of plastic, enables its terminal anti-shrinkage body to be separated from the jacket with ease, and makes it easy to take an optical fiber core out of the terminal of the optical fiber cable without any damage. SOLUTION: The optical fiber cable which has the anti-shrinkage body 5 in the jacket 4 made of plastic has a V-shaped groove 11 as a tearing part for tearing the jacket nearby the anti-shrinkage body on the outer or inner circumferential surface of the jacket 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable for optical communication mainly used for indoor wiring.

[0002]

2. Description of the Related Art An optical fiber cable used for indoor wiring generally has a structure in which a plurality of optical fiber core wires are surrounded by tensile strength fibers, and a plastic outer jacket is applied to the outer circumference thereof. This plastic jacket is
The residual strain at the time of processing relaxes with time and shrinks. When the shrinkage of the outer cover is large, stress is applied to the inner optical fiber core wire, which may affect the transmission characteristics of the optical fiber.

Therefore, in order to suppress the shrinkage of the jacket, a structure in which an anti-shrinkage body is embedded in the jacket is being studied. In Japanese Patent Publication No. 2793621, as shown in FIG. 10, a plurality of optical fiber core wires 1 are arranged in parallel and a tensile strength fiber 3 is arranged around a tape core wire 2 integrated in a tape shape,
An optical fiber cable having a structure in which a jacket 4 is provided on the outer periphery thereof is disclosed in which an anti-shrink body 5 is embedded in the jacket 4.

When such an optical fiber core wire is subjected to terminal processing such as attachment of an optical connector, it is necessary to tear the jacket of the terminal in the longitudinal direction to take out the optical fiber core wire or the tape core wire. In addition, there is a case where the work of removing the outer jacket of the intermediate portion in the longitudinal direction of the optical fiber cable, taking out the tape core wire, and separating this into a single core. In the case of performing such work, in the optical fiber cable having the structure shown in FIG. 10, it takes a great deal of time to tear out the outer sheath 4 at the end and the intermediate part and take out the optical fiber core wire 1. Therefore, in Japanese Unexamined Patent Publication No. 9-243886, a groove 11 having a V-shaped cross section is provided in the longitudinal direction from the outer peripheral surface of the jacket 4 toward the optical fiber core wire 1 as shown in FIG. A fiber optic cable is disclosed. The optical fiber core wire 1 can be taken out by tearing the jacket 4 from the V-shaped groove 11.

[0005]

When tearing the outer jacket 4 of the optical fiber cable terminal shown in FIG. 11, a fingertip is inserted into the V-shaped groove 11 provided in the outer jacket 4 and pulled so as to spread to the left and right. . At this time, stress acts in the direction in which the optical fiber core wire 1 is pressed, which may damage the optical fiber core wire 1.

Further, in the case of an optical fiber cable having a built-in tape core wire, when the optical connector is attached, it is necessary to caulk and fix the outer cover to the housing portion of the optical connector. In the case of an optical fiber cable in which an anti-shrink body is embedded in the outer cover, when the optical connector is attached, if the outer cover is caulked as it is, the outer cover is difficult to bend because of the anti-shrink body.
It is difficult to crimp. In addition, there is a problem that the anti-shrinkage body is broken when crimping. Therefore, a method of separating the anti-shrink body of the terminal from the outer jacket and caulking only the outer jacket is used, but in the conventional optical fiber cable, it takes a lot of time to separate the anti-shrink body. there were.

According to the present invention, in an optical fiber cable having an anti-shrinkage body for suppressing the shrinkage of the jacket, the anti-shrinkage body of the terminal can be easily separated from the jacket, and at the same time, the optical fiber core wire or the tape core. An object of the present invention is to provide an optical fiber cable in which the wire can be easily taken out from the end of the optical fiber cable without damaging the optical fiber core wire.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an optical fiber cable having an anti-shrinkage body for suppressing shrinkage of the outer cover in a plastic outer cover. It is characterized in that a tearing portion for tearing the outer cover in the vicinity of the anti-shrink body is provided on the outer peripheral surface or the inner peripheral surface of the.

The cut portion has a cross-section having a shape extending from the outer peripheral surface or the inner peripheral surface of the jacket toward the direction of the anti-shrink body, and is formed by providing a groove or a cut along the longitudinal direction.

Further, according to the present invention, there is provided an optical fiber cable having a structure in which a tensile strength fiber is arranged around a tape core wire in which a plurality of optical fibers are arranged in parallel, and an outer periphery thereof is covered with an anti-shrink body. It is characterized in that a tearing portion for tearing the outer cover in the vicinity of the anti-shrink body is provided on the outer peripheral surface or the inner peripheral surface of the outer cover.

The cut portion provided on the outer peripheral surface of the outer cover is
It is preferable that the two anti-shrinkage bodies and the tape core wire are grooves or cuts that are located above and below the anti-shrinkage body in a cross section in which they are arranged in parallel, and that are provided over the longitudinal direction. It is particularly preferable that the groove has a V-shaped cross section.

Further, a groove or notch is provided on the outer side surface of the outer side of the anti-shrinkage body in a cross section in which the two anti-shrinkage bodies and the tape core wires are arranged in parallel, and is provided over the longitudinal direction. Is also good. In this case, the groove is preferably U-shaped in cross section.

When the anti-shrink body and the jacket in the vicinity thereof are projected from the side surface of the optical fiber cable, a constricted portion of the jacket occurs at the contact point between the anti-shrink body jacket and both side edges of the optical fiber cable body. This portion becomes the cut portion. The central position of the projected anti-shrinkage body is preferably outside the outer peripheral side surface of the optical fiber cable.

It is preferable to have an adhesive layer at the interface between the anti-shrink body and the outer cover. The thickness of the adhesive layer is 1 μm or more 2
It is preferably 0 μm or less. In addition, it is preferable that a part of the components of the adhesive layer contains a coating material.

The anti-shrinkage body is made of a material other than metal and is preferably a non-metallic optical fiber cable. In this case, fiber reinforced plastic (FRP) is particularly suitable.

The shrinkage ratio before and after heating when the jacket containing the anti-shrink body was taken out from this optical fiber cable for a length of 150 cm and heat-treated at a temperature of 110 ° C. for 2 hours, was 1
% Or less is preferable.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 9 is a sectional view showing an embodiment of the optical fiber cable of the present invention. An optical fiber core wire 1 coated with an ultraviolet curable resin is surrounded by a tensile strength fiber 3 made of aramid fiber, two anti-shrinkage bodies 5 are arranged on both side edges thereof, and a jacket 4 is provided on the outer circumference thereof. And integrated. A groove 11 having a V-shaped cross section is provided from the outer surface of the jacket 4 toward the anti-shrink body 5.

FIG. 1 is a sectional view showing an embodiment of the optical fiber cable of the present invention. A plurality of optical fiber core wires 1 coated with an ultraviolet curable resin are arranged in parallel, and a tape core wire 2 integrated in a tape shape with the ultraviolet curable resin is surrounded by a tensile strength fiber 3 made of an aramid fiber. It was surrounded, two anti-shrinkage bodies 5 were arranged on both side edges thereof, and a jacket 4 was applied to the outer periphery thereof to be integrated. On the outer surfaces of both sides of the tape core wire 2 of the jacket 4, two grooves 11 having a V-shaped section in total are provided above and below two anti-shrinkers 5 from the outer surface of the jacket 4.
It is installed toward.

As the anti-shrinkage member 5, steel wire, fiber reinforced plastic (FRP), polyester string or the like is used.
As an optical fiber cable that is lightweight and has no electromagnetic induction,
A non-metallic optical fiber cable that does not use a metal material is suitable. In particular, glass fiber reinforced plastic (G-FRP) is suitable because it has appropriate compressive strength and rigidity. The outer diameter of the anti-shrink body 5 is preferably as small as possible in consideration of the storability in the jacket 4, but it is necessary to have a strength that can withstand the shrinkage of the jacket 4, so 0.2 mm or more and 0.9 mm or less is preferable. .

As the jacket 4, PVC, polyethylene,
Thermoplastic resins such as fluororesins and polyester elastomers are used. Since flame retardancy is required when used for indoor wiring, PVC or flame retardant polyethylene containing a flame retardant is suitable.

As the slits to be applied to the outer cover 4, U-shaped grooves are used in addition to the V-shaped grooves. The cut line may be a straight line, a perforation line or a peelable adhesive surface. The groove 11 having a V-shaped cross section is preferable in that the fingertips can be easily inserted into the groove and the outer cover 4 is easily torn when a force is applied to the left and right with the fingertips of both hands. The groove 11 having a V-shaped cross section has a groove width of 0.5 mm or more and 1.0 mm or less and a depth of 0.5 mm or more and 1.0 mm or less on the outer peripheral surface of the outer cover 4, so that it is easy to insert a fingertip into the groove, It is preferable in that it is easy to tear 4 apart.

As a more preferable form, the tape core wire 2 and the anti-shrink body 5 can be separated from the outer jacket 4 at the same time by combining the groove from the outer surface of the outer jacket 4 and the cut line from the inner surface.

FIG. 2 is a sectional view showing an embodiment of the optical fiber cable of the present invention. A plurality of optical fiber core wires 1 coated with an ultraviolet curable resin are arranged in parallel, and a tape core wire 2 integrated in a tape shape with the ultraviolet curable resin is surrounded by a tensile strength fiber 3 made of an aramid fiber. It was surrounded, two anti-shrinkage bodies 5 were arranged on both side edges thereof, and a jacket 4 was applied to the outer periphery thereof to be integrated. On the outer surfaces of both sides of the tape core wire 2 of the jacket 4, two grooves 11 each having a V-shaped cross section are provided on the upper and lower sides of the two anti-shrink objects 5 from the outer surface of the jacket 4.
It is being given towards. Also, the linear cut 13
Is applied from the inner surface of the outer cover 4 toward the anti-shrink body 5. Insert your fingertips into the left and right V-shaped grooves with both hands,
By pulling to the left and right, the outer cover 4 is torn from the tip of the V-shaped groove 11, and the anti-shrinkage body 5 can be taken out. At the same time, the linear notch 13 on the inner surface of the jacket 4 is torn, so that the tape core wire 2 can be taken out from the inside of the jacket 4. The cut line provided from the inner surface of the outer cover 4 toward the anti-shrink body 5 is preferably a linear cut line 13 because it is not necessary to insert a fingertip. The depth of the linear cut 13 is 0.3 mm or more and 0.7 mm
The following is preferable in that the jacket 4 is easily torn.

FIG. 3 is a sectional view showing another embodiment of the present invention. In an optical fiber cable having a structure similar to that of FIG. 1, a V-shaped groove 14 having a curved cross-section opened slightly from the inner surface of the jacket 4 toward the anti-shrink body 5 is provided on the inner surface of the jacket 4. There is. The V-shaped groove 14 having a curved cross section is preferable because it can be easily processed during manufacturing. The depth of the curved V-shape 14 is preferably 0.3 mm or more and 0.7 mm or less because the jacket 4 is easily torn.

FIG. 4 shows the optical fiber cable of the present invention,
The sectional view which shows another aspect is shown. In an optical fiber cable composed of a tape core wire 2, tensile strength fibers 3, two anti-shrinkage bodies 5 and an outer jacket 4 that integrates these as in FIG. 1, the outer surfaces of both side edges of the outer jacket 4 are respectively Outside the position corresponding to the two anti-shrinkage bodies 5, two grooves 12 having a U-shaped cross section
Is applied from the outer surface of the jacket 4 toward the anti-shrink body 5.

By inserting two fingertips into the groove of the groove provided on the jacket 4 and moving each finger up and down,
The jacket 4 can be torn. From the viewpoint of easy insertion of the fingertip, it is preferable that the cross section is U-shaped or V-shaped. When the grooved portion has a small space, as in the case of the optical fiber cable shown in FIG. 4, the V-shape cannot provide a sufficient depth and width. Grooves 12 are preferred. The U-shaped groove 12 has a groove width of 0.5 mm or more and 1.0 on the outer peripheral surface of the jacket 4.
It is preferable that the depth is 0.3 mm or less and the depth is 0.3 mm or more and 0.7 mm or less because it is easy to insert a fingertip into the groove and the outer cover 4 is easily torn.

As a further preferred form, a linear cut is provided from the inner surface of the outer jacket 4 toward the anti-shrink body 5, so that the tape core wire 2 and the anti-shrink body 5 are simultaneously covered with the outer jacket 4.
Can be separated from. FIG. 5 shows a sectional view showing the embodiment. In an optical fiber cable composed of the same tape core wire 2, tensile strength fiber 3 and two anti-shrinkage bodies 5 as in FIG. On the outer surface corresponding to the outer side, one groove 12 each having two U-shaped cross sections is provided from the outer surface of the jacket 4 toward the anti-shrink body 5. A linear cut 13 is provided from the inner surface of the outer cover 4 toward the anti-shrink body 5. By inserting two fingertips into the U-shaped groove on both the left and right sides with both hands and moving the two fingertips up and down, the outer cover 4 is torn from the tip of the U-shaped groove 12 and anti-shrink The body 5 can be taken out. At the same time, the linear notch 13 on the inner surface of the jacket 4 is torn, so that the tape core wire 2 can be taken out from the inside of the jacket 4.

The above-mentioned V-shaped and U-shaped grooves having a cross section and linear cuts can be easily produced by forming protrusions on dies and points when the jacket 4 is extrusion-molded. You can

By providing such grooves and cuts, the shrinkage of the jacket is not affected. Since the two anti-shrinkage bodies function, the shrinkage rate when the jacket is treated at a temperature of 110 ° C. for 2 hours is a sufficiently small value of 1% or less.

FIG. 6 shows the optical fiber cable of the present invention,
The sectional view which shows another aspect was shown. An optical fiber cable including a tape core wire 2, tensile strength fibers 3, two anti-shrinkage bodies 5 and an outer jacket 4 that integrates these, as in FIG.
The anti-shrink body 5 covered with the anti-shrink body jacket 21 projects from both side edges of the optical fiber cable, and at the contact point between the anti-shrink body jacket 21 and the side surface portion of the optical fiber cable body,
Since a constricted portion of the outer cover is formed, this portion serves as a tearing portion, and the outer cover 4 can be torn.

The length a at which the center of the anti-shrinkage body 5 projects from both side edges of the optical fiber cable is preferably a ≧ 0. More preferably, the diameter d of the anti-shrink body 5 should satisfy d / 2 <a ≦ d. d / 2 ≧ d
Then, since the anti-shrinkage body d does not sufficiently project, the constriction does not sufficiently occur at the contact point with the side surface portion of the optical fiber cable main body, and it is difficult to tear the jacket 4. a
When> d, the jacket between the anti-shrink body 5 and the side surface portion of the optical fiber cable body becomes too thick, so that it is difficult to tear the jacket 4.

As a more preferable form, the tape core wire 2 and the anti-shrink body 5 are provided by providing a groove having a linear cut or a curved V-shaped cross section from the inner surface of the jacket 4 toward the anti-shrink body 5. Can be separated from the jacket 4 at the same time. FIG. 7 shows a sectional view showing the embodiment. The same tape core wire 2, tensile strength fiber 3 and two anti-shrink bodies 5 as in FIG.
In the optical fiber cable in which the anti-shrink body 5 and the outer jacket 21 in the vicinity of the anti-shrink body 5 project from the side surface of the optical fiber cable, the curved V-shaped groove 14 is formed. It is applied from the inner surface of the outer cover 4 toward the anti-shrink body 5. By grasping the outer cover 21 near the anti-shrink body that is popping out with both hands and pulling it to the left and right, the anti-shrink body 5
Is torn along with the jacket 21 in the vicinity thereof and separated from the jacket 4 of the optical fiber cable body. At the same time, the curved V-shaped groove 14 on the inner surface of the jacket 4 is torn, so that the tape core wire 2 can be taken out from the inside of the jacket 4.

FIG. 8 is a cross-sectional view showing an example in which an adhesive layer 31 is provided at the interface between the anti-shrinkage body 5 and the jacket 4. A plurality of optical fiber core wires 1 coated with an ultraviolet curable resin are arranged in parallel, and a tape core wire 2 integrated in a tape shape with the ultraviolet curable resin is surrounded by a tensile strength fiber 3 made of an aramid fiber. Two anti-shrinkage bodies 5 which were surrounded and provided with an adhesive layer 31 on the outer circumferences on both side edges were arranged, and a jacket 4 was applied on the outer circumferences to integrate them. On the outer surface of both sides of the tape core wire 2 of the jacket 4,
A total of four grooves 11 having a V-shaped cross section are provided above and below the two anti-shrinkage bodies 5 from the outer surface of the jacket 4 toward the anti-shrinkage bodies 5. The adhesive layer 31 can be easily provided by applying an adhesive to the outer periphery of the anti-shrink body 5 in advance. By providing the adhesive layer 31, the adhesive force between the anti-shrink body 5 and the jacket 4 increases, and the effect of suppressing the shrinkage of the jacket 4 increases. When the anti-shrink body 5 is separated from the outer cover 4, the adhesive layer 31 is preferably attached to the anti-shrink body 5 and separated. Since the adhesive layer 31 has a better affinity with the anti-shrinkage body 5 than the outer jacket 4, an appropriate separability from the outer jacket 4 is maintained. The thickness of the adhesive layer is 1μ
It is preferably m or more and 20 μm or less. If it is 1 μm or less, it is difficult to obtain a sufficient adhesive force. On the other hand, when the thickness is 20 μm or more, the contraction force of the jacket 4 cannot be endured and the adhesive layer is broken, so that the shrinkage amount of the jacket 4 becomes large. The adhesive layer 31 is
It can be applied to the outer periphery of the anti-shrink body 5 by a method such as spraying or dipping.

By including the jacket material as a part of the components of the adhesive layer 31, the affinity between the adhesive layer 31 and the jacket 4 is improved and the adhesion can be improved. When polyethylene is used for the jacket 4, EVA is used as the adhesive layer 31.
An adhesive containing (ethylene vinyl acetate copolymer) as a main component can be used. By changing the content of the ethylene portion that is common to the polyethylene of the jacket 4 in the molecule of the EVA polymer, the adhesive force with the jacket 4 can be adjusted. By increasing the content of ethylene part, the composition becomes close to that of polyethylene of the jacket 4,
Increase the adhesive strength. Further, this adhesive has good adhesiveness to the metal or plastic used for the anti-shrink body 5.

When the thickness of the outer cover 4 is small and the adhesion area with the anti-shrink body 5 is small, it is advisable to include an adhesive component inside the outer cover 4. When the outer cover 4 is processed by extrusion molding, if a hot-melt adhesive is mixed in the molding material, the outer cover 4 and the anti-shrink body 5 can be bonded by the heat during the extrusion process. it can.

In the optical fiber cable of the present invention, by embedding the anti-shrink body in the jacket, the shrinkage rate when the jacket 4 is treated at a temperature of 110 ° C. for 2 hours can be suppressed to 1% or less.

[0037]

EXAMPLE An example of the present invention will be described with reference to FIG.
Twelve single mode type optical fiber core wires 1 coated with an ultraviolet curable resin were arranged in parallel, covered with the ultraviolet curable resin and integrated to obtain a tape core wire 2. A tensile strength fiber 3 made of aramid fiber was arranged on the outer circumference of the tape core wire 2, and anti-shrinkage bodies 5 made of glass fiber reinforced plastic (G-FRP) having an outer diameter of 0.4 mm were arranged on both side edges thereof. Further, an outer jacket 4 made of PVC was applied to the outer circumferences covering these. The direction of the anti-shrink body 5 from the outer peripheral surface of the outer jacket 4 at the portions whose cross sections are above and below the anti-shrink body 5 with respect to the surface where the two anti-shrink bodies 5 and the tape core wires 2 are arranged in parallel. The groove 11 having a V-shaped cross section was formed toward the end.

The groove 11 having a V-shaped cross-section is formed by providing a die with a V-shaped cross-section when the jacket 4 is extrusion-molded. The dimensions of the V-shaped groove 11 were 0.8 mm in width and 0.8 mm in depth on the outer peripheral surface of the jacket 4.

The jacket 4 having a length of 150 cm was taken out from this optical fiber cable and treated at a temperature of 110 ° C. for 2 hours. The length of the jacket 4 before and after the treatment was measured, and the shrinkage ratio was calculated. The value was 0.2%, which was a sufficiently small value. Further, when the work of separating the anti-shrink body 5 of the terminal portion and the optical fiber core wire 2 from this optical fiber cable was performed, they could be easily separated in 1 minute.

Next, an embodiment of the optical fiber cable shown in FIG. 4 will be described. Twelve single mode type optical fiber cores 1 coated with an ultraviolet curable resin are arranged in parallel, covered with an ultraviolet curable resin and integrated to obtain a tape core 2. A tensile strength fiber 3 made of aramid fiber is arranged on the outer periphery of the tape core wire 2, and glass fiber reinforced plastic (G-FR
An anti-shrink body 5 composed of P) is arranged. Further, an outer jacket 4 made of PVC is applied to the outer circumference covering them. A groove 12 having a U-shaped cross section is formed in a portion of the outer cover outside the anti-shrink body 5 from the side surface of the outer sheath at a position corresponding to the anti-shrink body toward the direction of the anti-shrink body 5. Figure 4
Fiber optic cable can be obtained.

The groove 12 having a U-shaped cross section can be formed by providing a die with a U-shaped cross-section when the outer cover 4 is extrusion-molded. The size of the U-shaped groove 12 is
The outer peripheral surface of the jacket 4 has a width of 0.8 mm and a depth of 0.4 mm.

The shrinkage ratio of the jacket 4 before and after taking out the jacket 4 of 150 cm length from this optical fiber cable and treating it at a temperature of 110 ° C. for 2 hours is a sufficiently small value of 0.2%.
Also, from this optical fiber cable, the anti-shrink body 5 at the end
The work of separating the optical fiber core wire 2 and the optical fiber core wire 2 can be easily separated in about 1 minute.

Next, an embodiment of the optical fiber cable shown in FIG. 6 will be described. Twelve single mode type optical fiber cores 1 coated with an ultraviolet curable resin are arranged in parallel, covered with an ultraviolet curable resin and integrated to obtain a tape core 2. A tensile strength fiber 3 made of aramid fiber is arranged on the outer circumference of the tape core wire 2 and anti-shrinkage bodies 5 made of glass fiber reinforced plastic (G-FRP) having an outer diameter of 0.4 mm are arranged on both side edges thereof. In addition, P on the outer circumference that covers them
The outer cover 4 made of VC is applied. The anti-shrink body 5 covered with the anti-shrink body jacket 21 forms the jacket 4 in a state of being projected from the side surface of the optical fiber cable, and the optical fiber cable of FIG. 6 is obtained.

The distance a at which the center of the anti-shrink body 5 projects from the outer side surface of the optical fiber cable body is 0.3 mm (3/4 of the outer diameter d of the anti-shrink body 5).

The shrinkage rate of the jacket 4 before and after taking out the jacket 4 having a length of 150 cm from this optical fiber cable and treating it at a temperature of 110 ° C. for 2 hours is a sufficiently small value of 0.3%.
Further, with respect to the optical fiber cable having a length of 1 m, the work of separating the anti-shrink body 5 and the optical fiber core wire 2 of the terminal portion can be easily separated in about 1 minute.

[0046]

Since the optical fiber cable of the present invention is provided with a tearing portion for tearing the outer sheath near the anti-shrink body on the outer peripheral surface or the inner peripheral surface of the outer sheath, the outer sheath of the outer sheath is protected from aging over time. In addition to suppressing shrinkage, the anti-shrink body of the terminal can be easily separated from the jacket, and at the same time, the optical fiber core or tape core can be easily taken out from the end of the optical fiber cable without damaging the optical fiber core.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an optical fiber cable of the present invention.

FIG. 2 is a sectional view showing an embodiment of another mode of the optical fiber cable of the present invention.

FIG. 3 is a sectional view showing an embodiment of another mode of the optical fiber cable of the present invention.

FIG. 4 is a sectional view showing an embodiment of another aspect of the optical fiber cable of the present invention.

FIG. 5 is a cross-sectional view showing an embodiment of another aspect of the optical fiber cable of the present invention.

FIG. 6 is a sectional view showing an embodiment of another aspect of the optical fiber cable of the present invention.

FIG. 7 is a cross-sectional view showing an embodiment of another aspect of the optical fiber cable of the present invention.

FIG. 8 is a sectional view showing an embodiment of another aspect of the optical fiber cable of the present invention.

FIG. 9 is a sectional view showing an embodiment of another aspect of the optical fiber cable of the present invention.

FIG. 10 is a sectional view showing a conventional optical fiber cable.

FIG. 11 is a cross-sectional view showing a conventional optical fiber cable.

[Explanation of symbols]

1 Optical fiber core 2 tape core wire 3 tensile strength fiber 4 jacket 5 Anti-shrink body 11 V-shaped groove 12 U-shaped groove 13 straight cuts 14 Curved V-shaped groove 21 Anti-shrink body jacket 22 Ripped part 31 Adhesive layer

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Claims (16)

[Claims] 1. An optical fiber cable having an outer sheath made of plastic on the outer circumference of an optical fiber core wire and provided with an anti-shrinkage body for suppressing shrinkage of the outer sheath. An optical fiber cable characterized in that a tearing portion for tearing the vicinity of the anti-shrinkage body of the jacket is provided on the surface. 2. The cross section of the cut portion has a shape extending from the outer peripheral surface or the inner peripheral surface of the jacket toward the anti-shrinkage body, and is a groove or cut provided in the longitudinal direction. The optical fiber cable according to claim 1. 3. A tape core wire in which a plurality of optical fiber core wires are arranged in parallel, a tensile strength fiber surrounding the optical fiber core wire, and an outer jacket in which two anti-shrinkage bodies located in the outer circumference thereof are embedded, An optical fiber cable, wherein a tearing portion for tearing an outer cover is provided near the anti-shrink body. 4. The cut portion is located above and below the anti-shrink body in a cross section in which the two anti-shrink bodies and the tape core wires are arranged in parallel, and is provided over the longitudinal direction. The groove is a groove.
Fiber optic cable as described. 5. The optical fiber cable according to claim 4, wherein the groove has a substantially V-shaped cross section. 6. The cut portion is located on the outer side surface of the outer surface of the anti-shrink body in a cross section in which the two anti-shrink bodies and the tape core wires are arranged in parallel, and is provided in the longitudinal direction. 4. The groove according to claim 3, which is a groove.
Fiber optic cable as described. 7. The optical fiber cable according to claim 6, wherein the groove has a substantially U-shaped cross section. 8. The tearing portion is located on the inner peripheral surface of the outer jacket of the anti-shrink body in a cross section in which the two anti-shrink bodies and the tape core wires are arranged side by side, and extends in the longitudinal direction. The optical fiber cable according to claim 3, which is a groove or a cut provided. 9. The optical fiber cable according to claim 3, wherein the anti-shrink body and an outer cover near the anti-shrink body project from a side surface of the optical fiber cable. 10. The optical fiber cable according to claim 9, wherein the center position of the anti-shrinkage body is outside the outer peripheral side surface of the optical fiber cable. 11. An interface between the anti-shrinkage body and the jacket,
The optical fiber cable according to claim 1 or 3, further comprising an adhesive layer. 12. The thickness of the adhesive layer is 1 μm or more 20
The optical fiber cable according to claim 11, wherein the optical fiber cable has a thickness of not more than μm. 13. The coating material is contained in a part of the components of the adhesive layer.
2. The optical fiber cable described in 2. 14. The optical fiber cable according to claim 1, wherein the anti-shrink body is made of a material other than metal and is a non-metallic optical fiber cable. 15. The optical fiber cable according to claim 14, wherein the anti-shrinkage body is a fiber reinforced plastic. 16. The optical fiber cable according to claim 1, wherein the shrinkage rate when the outer cover is heated at a temperature of 110 ° C. for 2 hours is 1% or less.