Intermittent connection-type optical fiber tape core wire, optical fiber cable, and method for manufacturing intermittent connection-type optical fiber tape core wire

1. An intermittently coupled-type optical fiber ribbon in which, in a state where a plurality of optical fibers are arranged in parallel, coupling portions at which adjacent optical fibers are coupled by a coupling resin and non-coupling portions at which the adjacent optical fibers are not coupled are intermittently provided in a longitudinal direction, the coupling portions and the non-coupling portions being provided between some or all of the plurality of optical fibers,

wherein at least some of the non-coupling portions include a convex portion of the coupling resin, a tip end of the convex portion having an acute angle in a cross-sectional view in a direction orthogonal to the longitudinal direction.

2. The intermittently coupled-type optical fiber ribbon according to claim 1 ,

wherein an outer diameter of the optical fiber is 160 μm or more and 220 μm or less.

3. The intermittently coupled-type optical fiber ribbon according to claim 1 ,

wherein the optical fiber includes a glass fiber, a coating layer covering a circumference of the glass fiber, and a colored layer covering a circumference of the coating layer, and

wherein, at least at a part of the non-coupling portion, the colored layer is exposed.

4. The intermittently coupled-type optical fiber ribbon according to claim 1 ,

wherein a Young's modulus of the coupling resin is 1200 MPa or less at 23° C.

5. The intermittently coupled-type optical fiber ribbon according to claim 1 ,

wherein a breaking elongation of the coupling resin is 150% or less at 23° C.

6. The intermittently coupled-type optical fiber ribbon according to claim 1 ,

wherein a minimum coating thickness from a surface of the coupling resin to a surface of the optical fiber is 10 μm or less.

7. The intermittently coupled-type optical fiber ribbon according to claim 1 ,

herein the optical fiber includes two coating layers,

wherein an outer coating layer of the two coating layers is a cured product of a resin composition containing:

a base resin containing a urethane acrylate oligomer or a urethane methacrylate oligomer, a monomer having a phenoxy group, a photopolymerization initiator, and a silane coupling agent; and

hydrophobic inorganic oxide particles, and

wherein a content of the inorganic oxide particles in the resin composition is 1% by mass or more and 45% by mass or less based on a total amount of the resin composition.

8. An optical fiber cable in which the intermittently coupled-type optical fiber ribbon according to claim 1 is installed, and

wherein a fiber density of the optical fiber cable obtained by dividing the number of optical fibers by a cable cross-sectional area is 4.5 fibers/mm 2 or more.

9. A method for manufacturing an intermittently coupled-type optical fiber ribbon in which, in a state where a plurality of optical fibers are arranged in parallel, coupling portions at which adjacent optical fibers are coupled by a coupling resin and non-coupling portion at which the adjacent optical fibers are not coupled are intermittently provided in a longitudinal direction, the coupling portions and the non-coupling portions being provided between some or all of the plurality of optical fibers, the method comprising:

forming the coupling portions by coating the plurality of optical fibers arranged in parallel with the coupling resin; and

forming the non-coupling portions by intermittently, in a longitudinal direction, pressing the coupling resin between the optical fibers with a pressing member having a sharp tip end so as to break at least a part of the coupling resin in such a way that a tip end of a broken surface where the coupling resin is broken becomes a convex portion having an acute angle in a cross-sectional view in a direction orthogonal to the longitudinal direction.