JP2011186003A - Optical fiber tape core and method for forming optical fiber tape core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily form intermittent feazed area parts on an optical fiber tape core at a low cost by a simple manufacturing means or process. <P>SOLUTION: Ultraviolet optical intensity is given, with alternated modulations, onto optical fiber cores, which are conveyed in the longitudinal direction, by an ultraviolet optical intensity modulating device, the optical fiber cores being coated with an ultraviolet-curable resin, to alternately form high intensity ultraviolet-cured coated parts and low intensity ultraviolet-cured coated parts in the longitudinal direction. An optical fiber tape core is formed by arranging in parallel the optical fiber cores which are formed in the above process. The optical fiber tape cores are stranded together, and the shapes of the tapes are maintained by the high intensity ultraviolet-cured coated parts of the optical fiber tape cores, and the shapes of the tapes are feazed by making the low intensity ultraviolet-cured coated parts cracked and come apart, in a low intensity ultraviolet-cured coated layer parts, to put each of the optical fiber cores in a feazed state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical fiber ribbon and a method for forming an optical fiber ribbon.

  Optical fiber has been remarkably developed in recent years as a transmission medium suitable for providing broadband services, and the amount of introduction has been increasing year by year. As the amount of introduction increases, the number of optical fibers that can be accommodated per cable increases, and high density of cables has been demanded. In order to increase the cable density and shorten the fusion splicing time, a tape-type optical fiber, that is, an optical fiber tape has been developed.

There are two types of optical fiber ribbons, in which optical fiber strands are arranged in a horizontal row and adjacent optical fiber cores are bonded together, and one is coated with a coating on the periphery. The number of optical fiber wires accommodated in one optical fiber ribbon is, for example, 2, 4, 5, 6, 8, 10 or 12. They are called multi-fiber ribbons corresponding to the respective numbers, and are distinguished from the single wires.
An optical fiber ribbon comprising a plurality of optical fiber strands arranged in parallel and a coating layer made of ultraviolet (UV) curable resin provided integrally on the plurality of optical fiber strands Is known in which a coating layer is provided at regular intervals or continuously along the longitudinal direction of an optical fiber. In addition, it has been proposed to intermittently irradiate ultraviolet rays for forming a structure and dissolve an uncured ultraviolet curable resin portion with a solvent. Patent Documents 1 to 5 provide these structures and manufacturing methods.

JP-A-64-59308 JP 2001-264604 A Japanese Patent Laid-Open No. 2003-232297 JP 2005-114830 A JP-A-6-1557077

  In the prior art, a portion in which the optical fiber strands are intermittently and constrained are formed in the longitudinal direction of the optical fiber ribbon constituting the optical fiber cable, and the temperature characteristics are improved and the intermediate portions are formed in the separated portions. The improvement of the extraction performance is aimed at.

  Conventionally, in forming this intermittent loose part, adhesive is intermittently applied to a part of the optical fiber strands arranged in parallel and cured to form the loose part in other places, An uncured resin portion is intermittently formed in a part of the optical fiber, and the solvent is dissolved in this portion to form a loose portion.

  Although intermittently scattered portions can be formed by these means and methods, there is a problem that the manufacturing method is complicated and the operation is difficult and not easy.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to easily and inexpensively form an intermittent scattering region portion on an optical fiber ribbon by simplifying the manufacturing means and method.

The present invention relates to an optical fiber ribbon comprising a plurality of optical fiber strands arranged in parallel and a coating layer made of an ultraviolet curable resin provided integrally on the plurality of optical fiber strands. ,
The coating layer is composed of a high-strength ultraviolet curable coating portion and a low-strength ultraviolet curable coating portion that is easily separated from each optical fiber tape core wire. An optical fiber ribbon is provided in which the optical fiber strands are alternately covered in a direction and are arranged alternately.

  The present invention is also characterized in that the high-intensity ultraviolet-curing coating portion and the low-intensity ultraviolet-curing coating portion have the same outer shape and do not exceed the thickness of the parallel optical fiber strands. A fiber ribbon is provided.

  The present invention is also characterized in that the high-strength ultraviolet curable coating portion and the low-strength ultraviolet curable coating portion have the same outer shape and are formed so as to cover the entire parallel optical fiber strands. An optical fiber ribbon is provided.

The present invention provides an optical fiber ribbon comprising a plurality of optical fiber strands arranged in parallel and a coating layer made of an ultraviolet curable resin provided integrally on the plurality of optical fiber strands. And
The coating layer is composed of a high-strength ultraviolet curable coating portion and a low-strength ultraviolet curable coating portion, and the high-strength ultraviolet curable coating portion and the low-strength ultraviolet curable coating portion are coated with the optical fiber in the longitudinal direction. And the tape shape is formed by being arranged alternately,
The high-strength ultraviolet curable coating portion holds the tape shape by the high-strength ultraviolet curable coating portion, the low-strength ultraviolet curable coating portion cracks the low-strength ultraviolet curable coating portion, and each optical fiber tape core An optical fiber ribbon is provided in which the tape shape is loosened by being loosened.

The present invention relates to a method of forming an optical fiber ribbon comprising a plurality of optical fiber strands arranged in parallel and a coating layer made of an ultraviolet curable resin integrally provided on the plurality of optical fiber strands. In
Forming an optical fiber ribbon that maintains a tape shape by applying an ultraviolet curable resin to an optical fiber that is arranged in parallel and conveyed in the longitudinal direction by an ultraviolet curable resin coating device;
The UV light intensity is alternately modulated on the optical fiber tape core coated with the UV curable resin that is conveyed in the longitudinal direction by the UV light intensity modulator, and the high strength UV curable coating portion and the low strength are alternately applied in the longitudinal direction. There is provided a method for forming an optical fiber ribbon, comprising forming a high-intensity UV-cured coating and cracking the low-strength UV-cured coating so as to disperse each of the optical fibers.

The present invention relates to a method of forming an optical fiber ribbon comprising a plurality of optical fiber strands arranged in parallel and a coating layer made of an ultraviolet curable resin integrally provided on the plurality of optical fiber strands. In
An ultraviolet curable resin is applied to a plurality of optical fiber strands arranged in parallel and conveyed in the longitudinal direction by an ultraviolet curable resin coating device to form an optical fiber tape core having a tape shape,
The UV light intensity is alternately modulated on the optical fiber tape core coated with the UV curable resin that is conveyed in the longitudinal direction by the UV light intensity modulator, and the high strength UV curable coating portion and the low strength are alternately applied in the longitudinal direction. Forming a high-strength UV-cured coating, forming an optical fiber tape core in which the formed optical fiber cores are arranged in parallel, twisting the optical fiber tape cores; The tape shape is maintained by the high-intensity UV-curing coating portion, and the low-intensity UV-curing coating portion is cracked by the low-intensity UV-curing coating portion, and then loosened to loosen the tape shape and loosen each fiber core. An optical fiber ribbon forming method characterized by the above is provided.

In the present invention, the ultraviolet curable resin is uniformly applied to the optical fiber tape core wire by the ultraviolet curable resin coating apparatus,
Provided is a method for forming an optical fiber ribbon, wherein the intensity of ultraviolet light is alternately stepwise modulated by the ultraviolet intensity modulator.

In the present invention, the ultraviolet curable resin is uniformly applied to the optical fiber tape core wire by the ultraviolet curable resin coating apparatus,
Provided is a method of forming an optical fiber ribbon, wherein the intensity of ultraviolet light is alternately modulated in a sine wave form by the ultraviolet intensity modulator.

  As described above, the coating layer is made up of a high-intensity ultraviolet-curing coating portion and a low-intensity ultraviolet-curing coating portion by UV curing means, and the high-intensity ultraviolet-curing coating portion and the low-intensity ultraviolet-curing coating portion are in the longitudinal direction. An optical fiber ribbon that is alternately arranged in a state where the fiber is covered is provided.

  Further, the optical fiber ribbon formed by the above steps is formed in parallel, and the optical fiber ribbon is twisted, and the optical fiber ribbon high-strength ultraviolet curable coating portion is formed. The tape shape is maintained by the above, and the high-low-intensity UV-curing coating portion is cracked in the low-intensity UV-curing coating portion so that the tape shape is loosened and loosened for each optical fiber. The manufacturing method and method can be simplified for the intermittently scattered portion, and the operation can be easily performed.

The figure which shows the basic composition of the optical fiber tape cable core of this invention. The figure which shows the outline of an optical fiber tape core wire forming apparatus. The figure which shows the coating layer (coating film) hardening intensity modulation example 1 of an optical fiber tape core wire. The figure which shows the coating layer (coating film) hardening intensity modulation example 2 of an optical fiber ribbon. The figure which shows a twisting and a process. Process drawing which forms a tape-shaped loosening state. The figure which shows the various ribbon shapes which can be employ | adopted by a present Example.

  FIG. 1 shows a basic configuration of an optical fiber ribbon 100 of the present invention. In FIG. 1, an optical fiber ribbon 100 includes a plurality of optical fiber strands arranged in parallel and a coating layer made of an ultraviolet curable resin integrally provided on the plurality of optical fiber strands. And is configured. FIG. 1 shows an optical fiber core formed by providing a coating layer for forming a tape on an optical fiber coated with a fiber consisting of a core and a clad, and a plurality of optical fibers are arranged in parallel. In this configuration, a plurality of optical fiber ribbons are arranged in parallel to form an optical fiber ribbon as a whole. The optical fiber ribbon is illustrated. In FIG. 1, reference numeral 100 denotes an optical fiber ribbon, 1 denotes each optical fiber, and 2 denotes a coating layer of each optical fiber. The optical fiber is inside each optical fiber core 1 and cannot be visually observed.

  In the optical fiber ribbon 100 constructed as described above, the coating layer 2 is composed of a high-intensity ultraviolet-curing coating portion 3 having a high UV (ultraviolet) curing strength and a low-intensity ultraviolet-curing coating portion 4 having a low UV curing strength. These high-strength ultraviolet curable coating portions 3 and low-intensity ultraviolet curable coating portions 4 are alternately and continuously disposed in a state where the optical fiber strands are coated in the longitudinal direction.

And the optical fiber ribbon formed in the above process is formed in parallel, the optical fiber tape core is formed, the optical fiber ribbon is twisted, and the above-mentioned optical fiber ribbon high-strength ultraviolet curable coating portion The low-strength ultraviolet curable coating portion is held by the low-strength ultraviolet curable coating portion, and the low-strength ultraviolet curable coating layer portion is cracked and loosened to loosen the tape shape to be loosened for each optical fiber core. A cord intermittent tape is formed.

  FIG. 2 shows an optical fiber ribbon forming apparatus 100 that forms an optical fiber ribbon.

  In FIG. 2, an optical fiber ribbon forming apparatus 100 includes an optical fiber feeding device 21, an optical fiber parallel device 22, a UV curable resin coating device 23, a UV light source 24 of a UV curable resin curing device, and a UV light source 24. Are provided with a UV light intensity modulation device 25, a roller 26, an optical fiber ribbon winding device 27, and a twisting device 29 connected to each other.

  The plurality of optical fiber strands 20 sent out from the optical fiber strand delivery device 21 are transported through a line 28, paralleled by an optical fiber strand parallel device 22, and further transported to a UV curable resin coating device 23 uniformly. A UV curable resin is applied to the surface. The coating amount may be adjusted in relation to the light intensity of the next UV light source 24.

  This UV curable resin is composed of an acrylate resin such as an acrylic board, an acrylate ester, an acrylate resin, or the like, and has a property of curing when irradiated with ultraviolet rays.

  The UV curable resin coating device 23 coats and coats each optical fiber 20 with a UV curable resin to form a UV coated core wire. The formation of the UV-coated core wire forms the optical fiber core wire. The UV curable resin coating device 23 further coats and coats the UV curable resin between the parallel optical fiber core wires (UV coated core wires) to form a UV coating portion, thereby forming an optical fiber tape core wire.

  The formed optical fiber ribbon is further conveyed and irradiated with ultraviolet rays over the entire surface by a UV light source 24 that forms a UV resin curing device.

  In the UV light source 24, the UV light intensity is modulated by a UV light intensity modulation device 25 connected to the UV light source 24, and light having a light intensity that has been intensity-modulated is irradiated onto the optical fiber ribbon. As will be described later, the UV light intensity modulation device 25 creates a modulation signal in a staircase type, a sine wave type, or a combination of these, transmits the modulation signal to the UV light source 24, and is controlled by the intensity of the modulation signal. That is, ultraviolet rays are applied to the optical fiber ribbon.

  Due to this modulated light irradiation, both the UV coating, that is, the UV coating of the UV coating portion of the UV coating core wire, has a high-strength UV-curing coating portion with a high curing strength and a low-strength UV curing with a low curing strength. A covering portion is formed. These high-intensity ultraviolet-curing coating portions and low-intensity ultraviolet-curing coating portions are alternately arranged in a state where the optical fiber strand is coated in the longitudinal direction or a state where the optical fiber core wire is coated.

  The covering strength modulation tape core wire 10 is transported and maintained, and twisted, that is, twisted, by a twisting device 29 provided at a specific position for transporting.

  The optical fiber ribbon that has been irradiated with light, that is, ultraviolet rays in this manner, becomes a coating strength-modulated optical fiber ribbon 30 that is conveyed through the roller 26 and wound by the optical fiber ribbon take-up device 27. It is done.

  FIG. 3 shows a coating layer (coating film) curing intensity modulation example 1 of the optical fiber ribbon.

  FIG. 3A shows a view from the side of the coated strength-modulated optical fiber ribbon 30, and FIG. 3B shows a longitudinal section.

  As described above, in this example, the coating intensity-modulated optical fiber core 30 is constituted by a 4-core tape core wire, each optical fiber core wire is provided with a UV coating portion, and each optical fiber core wire is It is formed as a UV coated core wire 31. And the UV coating | coated part 32 is formed between each UV coating | coated core wire 31 (equivalent to each optical fiber core wire of FIG. 1). The covering portion 32 is formed in a range not exceeding the thickness of the optical fiber cores arranged in parallel, and corresponds to the high-intensity ultraviolet curable coating portion (high-intensity UV coating portion) 33 (corresponding to the high-intensity ultraviolet curable coating portion 3 in FIG. 1). ) And the low-intensity UV-curing coating part (low-intensity UV-coating part) 34 (corresponding to the low-intensity UV-curing coating layer part 4 in FIG. 1) have the same outer shape. In the example shown in FIG. 1, the coating layer of the optical fiber core wire is formed in a range not exceeding the thickness of the parallel optical fiber strands.

  As shown in FIG. 3 (a), the light intensity is set by a staircase pattern 35, a sine pattern 36, or a pattern that is a combination thereof, and is a coating layer on the UV coated core wire that is an optical fiber tape core wire. A certain UV coating 32 is irradiated. As a result, the UV coating portion 32 is formed with two patterns of UV curing strengths of the curing patterns 1 and 2. The aforementioned high-intensity ultraviolet curable coating part (high-intensity UV coating part) 33 and low-intensity ultraviolet curable coating part (low-intensity UV coating part) 34 are formed in a form corresponding to the curing pattern. These correspond to the region of high hardening strength and the region of low reinforcing strength in FIG.

  FIG. 4 shows a coating layer curing intensity modulation example 2 of the optical fiber core wire.

  Even in this example, it is substantially the same as the example shown in FIG. 3, but the covering portion 32 is formed so as to cover the parallel optical fiber core wires or the entire optical fiber strands. In the same manner as described above, a high-intensity ultraviolet curable coating part (high-intensity UV coating part) 33 and a low-intensity ultraviolet curable coating part (low-intensity UV coating part) 34 are formed.

  In the case of this example, the staircase pattern 35 is a slightly faster forward irradiation than the above staircase pattern because the UV covering portion 32 covers the whole.

  3 and 4, the curing rate of the high-strength ultraviolet curable coating portion 33 is, for example, 90% or more, and the curing rate of the low-strength ultraviolet curable coating portion 34 is, for example, 50% or less (not including 0). The By setting such a curing rate, the light irradiation of the UV light source 24 of FIG. 2 is configured in two stages, the first stage is irradiated with low intensity, the second stage is irradiated with high intensity, and continuous irradiation is performed. be able to. Therefore, the UV coating portion 32 is a continuous UV-curing coating portion, part of which is a high-strength UV-curing coating portion 33 and the other portion is a low-strength UV-curing coating portion 34, which is continuous in the longitudinal direction. Thus, a UV-coated core wire 31 in which these cured large and small regions are alternately formed, that is, an optical fiber tape core wire having these core wires, that is, a coated intensity-modulated optical fiber tape core wire 30 is formed. Is done.

  When the optical fiber ribbons thus formed are bundled into a cable, the optical fiber ribbon 30 is twisted by the twisting device 29, that is, twisted, as shown in FIG.

  In the case of this twisting, the optical fiber tape core wire 30 having a continuous cured region can be easily twisted, and in this twisting step, a portion in a region of a portion having a small (weak) curing strength The low-strength UV-curing coating 34 is cracked, unraveled (broken), and the tape shape is unraveled. That is, it is distributed to each optical fiber core wire. The present embodiment has another feature that a region in which the tape shape is broken is formed using this twisting process.

When the tape shape is loosened, the optical fiber core wire or the optical fiber strand forming the optical fiber tape core wire is in a single core state. On the other hand, the high-strength ultraviolet curable coating portion 33 in the region of the portion having a high (strong) cure strength maintains the tape shape, that is, maintains the tape shape.
Accordingly, at the stage where the cable forming process is completed, the optical fiber ribbon 30 becomes an intermittent tape strand in a region of a portion having a low curing strength.

As a result, when a bending stress is applied to the cable or a low-temperature shrinkage force is applied to the cable, the intermittent tape portion relaxes the stress concentration and prevents an increase in loss.
Further, since the tape shape is broken in the intermittent tape portion, when the optical fiber is taken out from the middle of the cable and then branched off, the taking-out operation of the optical fiber becomes simple.

  As described above, the optical fiber tape core wire formed in this way has a coating layer composed of a high-strength UV-curing coating portion and a low-strength UV-curing coating portion. A tape shape is formed by alternately arranging the optical fiber strands in the longitudinal direction with the UV curable coating portion, and this high strength UV curable coating portion is the high strength UV curable coating portion. The tape shape is held by the covering portion, and the low-intensity UV-curing coating portion is cracked and loosened by the low-intensity UV-curing coating portion, so that the tape shape is loosened.

  FIG. 6 shows a process of forming a tape-shaped loosening state.

  A plurality of optical fiber strands are arranged in parallel (S1).

  A taped UV curable coating resin is applied on the circumference of the parallel optical fiber strands to form a coated optical fiber ribbon (S2). In this case, a UV coating 32 is further formed as shown in FIGS. An optical fiber ribbon coated with a UV resin curing device is fed to continuously cure the resin. At this time, the intensity of the UV light source is modulated to give strength to the curing intensity (S3).

  The strength is transferred to the coating layer (part) of the coated optical fiber ribbon (S4).

  When this optical fiber ribbon is formed into a cable, twisting is alternately applied as clockwise and counterclockwise by utilizing the fact that it is continuously cured. That is, twisting is performed (S5).

When twisting is continued, the coating cracks and breaks in the portion of the optical fiber core wire in the region where the coating strength is weak, and the tape shape is loosened. The tape shape (tape state) is maintained in the strong region (S6).
The optical cable in the intermittent tape state is completed by loosening the tape shape (S7).

As described above, the method for forming the optical fiber ribbon can be formed by the following steps.
An optical fiber core wire is formed by applying an ultraviolet curable resin to a plurality of optical fiber strands arranged in parallel and conveyed in the longitudinal direction by an ultraviolet curable resin coating device.

  The UV light intensity is alternately modulated on the optical fiber core wire coated with UV curable resin conveyed in the longitudinal direction by the UV light intensity modulator, and the high strength UV curable coating and low strength are alternately applied in the longitudinal direction. An ultraviolet curable coating is formed.

  Form the optical fiber tape core wire in which the optical fiber core wires formed in the above steps are arranged in parallel, twist the optical fiber tape core wires, and form the tape shape with the high-strength UV curable coating part of the optical fiber tape core wire The low-strength ultraviolet curable coating portion is cracked by the low-intensity ultraviolet curable coating portion, and is loosened to loosen the tape shape so that each optical fiber core is loosened.

  At the stage where the cable forming process is completed through these steps, the optical fiber ribbon 30 becomes an intermittent ribbon in the region of a portion having a low curing strength.

  FIG. 7 shows the shapes of various ribbons 10 provided with the tape core wire 31 and the UV coating portion 32.

  FIG. 7 (a) shows a typical ribbon 10 of the shape shown in FIGS. FIG. 7B shows the ribbon 10 in which the adjacent portions of the adjacent tape cores are brought into close contact with each other by the substantially UV-shaped UV coating portion 32, that is, an edge bond type ribbon. FIG.7 (c) shows the ribbon 10 which made the UV coating | coated part 32 the tape shape, and, so to speak, a tape shape type | mold ribbon. In forming this shape, a UV tape is formed by applying UV resin to the side surfaces of the four tape cores 31 arranged in parallel using a soft brush-like tool. UV resin can be applied in an ink jet format. It may be applied to both sides. In FIG. 7D, the four tape cores 31 are separated from each other, a UV coating portion having a constant thickness, for example, h, is formed at the separated portions, and the outer surface is the same as shown in FIG. 7B. This is an example of the ribbon 10.

  The ribbon 10 having such a shape has a shape as shown in FIGS. 3 and 4, and the high-intensity UV coating portion 33 and the low-intensity UV coating portion 34 are formed.

  Although the present invention has been described in the above embodiments, the present invention is not limited to the above embodiments. For example, by providing multiple light sources with different wavelengths to the light source of the ultraviolet curing device, applying the wavelength dependence of the ultraviolet resin curing intensity, and irradiating alternately the high and low curing wavelengths, the resulting optical fiber tape It is also possible to modulate the coating strength of the core wire. The coating layer of the optical fiber ribbon produced in this way is cracked in the cable forming process and can be made into an intermittent tape.

  DESCRIPTION OF SYMBOLS 1 ... Each optical fiber core wire, 2 ... Coating layer of each optical fiber core wire, 3 ... High intensity ultraviolet curing coating part (high intensity UV coating part), 4 ... Low intensity ultraviolet curing coating part (low intensity UV coating part) DESCRIPTION OF SYMBOLS 20 ... Optical fiber strand, 21 ... Optical fiber strand delivery apparatus, 22 ... Optical fiber strand parallel apparatus, 23 ... UV curable resin coating apparatus, 24 ... UV light source of UV curable resin curing apparatus, 25 ... UV curable resin Curing device UV light intensity modulation device, 26 ... roller, 27 ... optical fiber tape core winding device, 29 ... twisting device, 30 ... coating intensity modulation optical fiber tape core wire, 31 ... each UV coated core wire (FIG. 1) Corresponding to each of the optical fiber cores), 32... UV coating portion, 33... High-intensity UV-curing coating portion (corresponding to high-intensity UV coating portion, high-intensity UV-curing coating portion 3 in FIG. 1), 34. Cured coating (low-strength UV coating) Corresponds to low intensity UV cured coating unit 4 in FIG. 1), 35 ... stepped pattern, 36 ... sign type pattern, 100 ... optical fiber ribbon forming device.

Claims (8)

In an optical fiber ribbon comprising a plurality of optical fiber strands arranged in parallel and a coating layer made of an ultraviolet curable resin provided integrally on the plurality of optical fiber strands,
The coating layer is composed of a high-strength ultraviolet curable coating portion and a low-strength ultraviolet curable coating portion that is easy to disperse each optical fiber core. An optical fiber ribbon, wherein the optical fiber strands are alternately arranged in a state of covering the optical fiber.   2. The optical fiber according to claim 1, wherein the high-strength ultraviolet curable coating portion and the low-strength ultraviolet curable coating portion have the same outer shape and do not exceed the thickness of the parallel optical fiber strands. Tape core.   2. The light according to claim 1, wherein the high-intensity ultraviolet curable coating portion and the low-intensity ultraviolet curable coating portion have the same outer shape and are formed so as to cover the entire parallel optical fiber wires. Fiber ribbon. In an optical fiber ribbon comprising a plurality of optical fiber strands arranged in parallel, and a coating layer made of an ultraviolet curable resin integrally provided on the plurality of optical fiber strands,
The coating layer is composed of a high-strength ultraviolet curable coating portion and a low-strength ultraviolet curable coating portion, and the high-strength ultraviolet curable coating portion and the low-strength ultraviolet curable coating portion are coated with the optical fiber in the longitudinal direction. And the tape shape is formed by being arranged alternately,
The high-strength ultraviolet curable coating portion holds the tape shape by the high-strength ultraviolet curable coating portion, and the low-strength ultraviolet curable coating portion cracks the low-strength ultraviolet curable coating portion, and the optical fiber cores are separated. An optical fiber ribbon that has a tape shape that is loosened by being loosened. In a method of forming an optical fiber ribbon comprising a plurality of optical fiber strands arranged in parallel and a coating layer made of an ultraviolet curable resin provided integrally on the plurality of optical fiber strands,
Forming an optical fiber ribbon that maintains a tape shape by applying an ultraviolet curable resin to an optical fiber that is arranged in parallel and conveyed in the longitudinal direction by an ultraviolet curable resin coating device;
The UV light intensity is alternately modulated on the optical fiber tape core coated with the UV curable resin that is conveyed in the longitudinal direction by the UV light intensity modulator, and the high strength UV curable coating portion and the low strength are alternately applied in the longitudinal direction. A method for forming an optical fiber ribbon, comprising forming a high-intensity UV-cured coating and cracking the low-strength UV-cured coating to separate each of the optical fibers. In a method of forming an optical fiber ribbon comprising a plurality of optical fiber strands arranged in parallel and a coating layer made of an ultraviolet curable resin provided integrally on the plurality of optical fiber strands,
An ultraviolet curable resin is applied to a plurality of optical fiber strands arranged in parallel and conveyed in the longitudinal direction by an ultraviolet curable resin coating device to form an optical fiber tape core having a tape shape,
The UV light intensity is alternately modulated on the optical fiber tape core coated with the UV curable resin that is conveyed in the longitudinal direction by the UV light intensity modulator, and the high strength UV curable coating portion and the low strength are alternately applied in the longitudinal direction. Forming a high-strength UV-cured coating, forming an optical fiber tape core in which the formed optical fiber cores are arranged in parallel, twisting the optical fiber tape cores; The tape shape is maintained by the high-intensity UV-curing coating portion, and the low-intensity UV-curing coating portion is cracked by the low-intensity UV-curing coating portion, and then loosened to loosen the tape shape and loosen each fiber core. A method of forming an optical fiber ribbon, characterized by In Claim 6, uniformly applying an ultraviolet curable resin to the optical fiber tape core wire by the ultraviolet curable resin coating device,
A method of forming an optical fiber ribbon, wherein the intensity of ultraviolet light is alternately modulated stepwise by the ultraviolet intensity modulator. In Claim 6, uniformly applying an ultraviolet curable resin to the optical fiber tape core wire by the ultraviolet curable resin coating device,
A method of forming an optical fiber ribbon, wherein the intensity of ultraviolet light is alternately modulated in a sine wave form by the ultraviolet intensity modulator.

Images