JPH0749447Y2 - Optical fiber tape core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention generally relates to an optical fiber, and in particular, a plurality of optical fiber wires are arranged in a plane and the outer periphery thereof is collectively covered with an outer layer material. The present invention relates to a tape-shaped optical fiber ribbon.

Conventional technology and problems Conventionally, the number of cores of optical fiber cables has been increased, and
As shown in the figure, a tape type optical fiber has been proposed. In other words, the optical fiber tape core wire 1 is composed of a plurality of optical fiber wires 8 (four in this example) formed by coating the optical fiber bare wire 2 with the primary coat 4 and the buffer coat 6. The outer layer material
It is formed by collectively covering with 10 to form a tape.

When connecting such two optical fiber tape core wires 1,
When the connection is made not for all at once but for each single core, it is necessary to tear off the outer layer material 10 of the optical fiber tape core wire to separate each optical fiber element wire 8 and take it out individually.

Usually, the buffer coat 6 that is the outer layer of the optical fiber 8
And a material having the same or similar physical properties as the tape outer layer material 10 in contact with the buffer coat are used, and the buffer coat 6 and the tape outer layer material 10 are extremely closely adhered to each other. It was extremely difficult to tear the material 10 and take out each optical fiber wire 8 individually. Further, if the optical fiber strands 8 are forcibly separated, the coating layers 4 and 6 of the optical fiber strands 8 are also peeled off and the bare optical fiber lines 2 are exposed.
In particular, such a problem occurs in the primary coat 4, the buffer coat 6 and the tape outer layer material 10, for example, urethane acrylate resin, unsaturated polyester resin, epoxy (for the purpose of cost reduction, diameter reduction, high speed drawing of the optical fiber, etc.). This is remarkable when an ultraviolet curable resin containing a (meth) acrylate resin as a main component is used.

As a result of conducting research and experiments to solve the above problems, the present inventors have further preferred to provide a coating layer of the same UV curable resin as the primary coat on the outer periphery of each optical fiber strand, which is more preferable. Is the Young's modulus of the UV-curable resin layer forming the primary coat of each optical fiber strand and the coating layer provided on the outer periphery of each optical fiber strand, and forming the buffer coat of each optical fiber strand. By setting the Young's modulus of the ultraviolet curable resin layer to be smaller than
It was found that the outer layer material of the tape was torn to separate the individual fiber cores when the optical fiber wires were pulled out.
The present invention is based on such a new finding.

DISCLOSURE OF THE INVENTION The object of the present invention is to provide an optical fiber tape core wire which can very easily separate each optical fiber element wire and to take it out individually when the tape outer layer material is torn.

Means for Solving the Problems The above object is achieved by the optical fiber ribbon according to the present invention. In summary, the present invention has a plurality of optical fiber strands arranged in a plane, and the outer periphery of the optical fiber strands is collectively covered with an outer layer material to form a tape-shaped optical fiber tape. Primary coat and buffer coat,
Also, the outer layer material is formed of an ultraviolet curable resin, and a coating layer is formed on the outer periphery of each of the optical fiber strands by the same ultraviolet curable resin as the primary coat to form the primary coat and the coating layer. The Young's modulus of the ultraviolet-curable resin layer is smaller than the Young's modulus of the ultraviolet-curable resin layer forming the buffer coat.

EXAMPLE Next, the optical fiber ribbon according to the present invention will be described in more detail with reference to the drawings.

Referring to FIG. 1, an optical fiber tape core wire 1A according to the present invention has the same structure as a conventional optical fiber tape core wire 1, and a primary coat 4 and a buffer coat are provided on an optical fiber bare wire 2 composed of a core and a cladding. A plurality of (four in this example) optical fiber wires 8 formed by coating 6 and 6 are arranged in a plane, and the outer periphery thereof is collectively covered with an outer layer material 10 to form a tape. However, according to the present invention, there is a great difference from the conventional optical fiber tape core wire 1 in that a coating layer 12 is further provided as an outer layer of the buffer coat 6 with the same UV curable resin as the primary coat 4.

In the present invention, preferably, the Young's modulus of the ultraviolet curable resin layer forming the primary coat 4 of each optical fiber element 8 and the coating layer 12 provided on the outer periphery of each optical fiber element is It is smaller than the Young's modulus of the ultraviolet curable resin layer forming the buffer coat 6 of the optical fiber strand, and more specifically, the former, that is, the primary coat 4 of each optical fiber strand and each of the optical fiber strands. The Young's modulus of the ultraviolet curable resin layer forming the coating layer 12 provided on the outer periphery of the is 0.01 to 0.5 Kg / mm ² , and the latter, that is, the ultraviolet light forming the buffer coat 6 of each optical fiber element. The Young's modulus of the curable resin layer is set to 30 to 100 Kg / mm ² .

The primary coat 4 and the buffer coat 6 of each optical fiber strand are formed in a normal thickness, but the thickness of the ultraviolet curable resin layer forming the coating layer 12 provided on the outer periphery of the optical fiber strand 8 Is preferably 1 μm to 10 μm.

Next, the present invention will be described more specifically.

Example 1 An optical fiber bare wire (GI type quartz optical fiber) 2 consisting of a core (diameter 50 μm) and a cladding (outer diameter 125 μm) 2 was coated on a UV curable resin containing urethane acrylate as a main component (Dainippon Ink and Chemicals Incorporated). FC-0645) manufactured by Co., Ltd. and primary coating (outer diameter 200 μm) 4 and UV-curable resin containing urethane acrylate as a main component (UD-246 manufactured by Yokohama Rubber Co., Ltd.) buffer coat (outer diameter 250 μm)
6 was sequentially coated, and the coating layer was cured by irradiating with ultraviolet rays to prepare an optical fiber element 8. At this time, the Young's modulus of the primary coat layer 4 was 0.3 Kg / mm ² , and the Young's modulus of the buffer coat layer 6 was 50 Kg / mm ² .

Then, an ultraviolet curable resin containing urethane acrylate as a main component (FC-0645, manufactured by Dainippon Ink and Chemicals, Inc.) is applied onto the optical fiber wires 8 in a thickness of 2 μm,
The coating layer 12 was cured by irradiation with ultraviolet rays.

Each of the optical fiber wires thus produced is collectively arranged in a plane, and an ultraviolet curable resin containing urethane acrylate as a main component as the outer layer material 10 (UD-246, manufactured by Yokohama Rubber Co., Ltd.) is provided around the outer periphery thereof. ) Was used to collectively coat the optical fiber ribbons, and they were cured by irradiation with ultraviolet rays.

When tearing the outer layer material 10 of this tape type optical fiber,
It was possible to separate the optical fiber wires 8 from the tape outer layer material 10 very smoothly, and to separate and take out the optical fiber wires 8 individually. At this time, the force required to separate two adjacent optical fiber wires 8 over a length of 10 cm was 4 g.

Comparative Example 1 A tape type optical fiber was produced in the same manner as in Example 1 except that the coating layer 12 was not formed as the outer layer of the optical fiber element wire 8 and the tape outer layer material 10 was torn. In each optical fiber element, both the primary coating material and the buffer coating material were peeled off from the optical fiber bare wire together with the tape outer layer material, and the bare optical fiber was exposed. At this time, the force required to separate two adjacent optical fiber strands over a length of 10 cm was 16 g.
It was. Example 1 according to the conventional tape type optical fiber
It can be seen that it is more difficult to separate the optical fiber strands from the one of the present invention shown in FIG.

Effect of the Invention As described above, in the tape type optical fiber according to the present invention, the outer layer material of the tape is torn since the coating layer is provided as the outer layer of the optical fiber strand with the same UV curable resin as the primary coat. In this case, it has a feature that each optical fiber wire can be separated very easily and individually taken out.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the optical fiber ribbon according to the present invention. FIG. 2 is a cross-sectional view of a conventional optical fiber tape core wire. 2: Optical fiber bare wire 4: Primary coat 6: Buffer fiber 8: Optical fiber strand 10: Tape outer layer material 12: UV curable resin coating layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kobayashi Shibuya, Creator 1-1, 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Cable Denki Co., Ltd. (72) Minor Chiba 2 Sakae-Oda, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 1-1 No. 1 Showa Densen Denki Co., Ltd. (56) References JP-A-58-98707 (JP, A) JP-A-61-246709 (JP, A) Actually-opened Sho-62-51310 (JP, U)

Claims (3)

[Scope of utility model registration request] 1. A plurality of optical fiber wires are arranged in a plane,
In an optical fiber tape core wire which is formed into a tape shape by collectively covering the outer periphery thereof with an outer layer material, a primary coat and a buffer coat of each optical fiber element, and the outer layer material formed of an ultraviolet curable resin, and A coating layer is provided on the outer periphery of each of the optical fiber strands with the same UV curable resin as the primary coat, and the Young's modulus of the UV curable resin layer forming the primary coat and the coat layer forms the buffer coat. An optical fiber tape core wire having a Young's modulus smaller than that of the ultraviolet curable resin layer. 2. The Young's modulus of the ultraviolet curable resin layer forming the primary coat of each optical fiber element and the coating layer provided on the outer periphery of each optical fiber element is 0.01 to 0.5 kg / mm.
^2. The optical fiber tape core wire according to claim 1, wherein the Young's modulus of the ultraviolet curable resin layer forming the buffer coat of each optical fiber strand is 30 to 100 kg / mm ² . 3. The ultraviolet curable resin layer forming a coating layer provided on the outer periphery of each optical fiber element has a thickness of 1 μm to 10 μm.
The optical fiber tape core wire according to claim 1 or 2, wherein the utility model registration is defined as μm.