Sumitomo Electric Industries, Limited

Ken Manabe

Makoto Itoh

Tetsuya Nakajima

Kentaro Takeda

Deva Omalka Vayanthi Suduwa

Reo Amano

Akifumi Matsuoka

An optical-fiber ribbon includes a plurality of optical-fibers, and a common covering layer. There are formed a plurality of intermittent connection portions in which a first connection portion that is formed from the common covering layer and a non-connection portion are alternately formed between the optical-fibers. There are formed a plurality of continuous connection portions in which a second connection portion that is formed from the common covering layer is continuously formed between optical-fibers. The intermittent connection portions include a central intermittent connection portion at a central portion of the optical-fiber ribbon in a width direction. The continuous connection portions include adjacent continuous connection portions. A thickness of adjacent continuous connection portion is larger than a thickness of the central intermittent connection portion and is larger than a thickness of the continuous connection portion other than the adjacent continuous connection portions.

Optical-fiber ribbon, die, and method of manufacturing optical-fiber ribbon

A steel wire having a cross section perpendicular to a longitudinal direction having a flat shape, and an outer shape of the cross section including a pair of linear parts opposing each other, and a pair of curved parts opposing each other and connecting the linear parts. The curved part includes a pair of first regions located at positions near the linear parts, and a second region located at a position between the pair of first regions, a radius of curvature, Rof the first region is greater than or equal to 0.05 mm but less than 0.15 mm, and a radius of curvature, Rof the second region is greater than or equal to 0.13 mm but less than or equal to 0.2 mm, and an angle between the linear part and the curved part is greater than or equal to 165 degrees.

Steel wire and tire

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Osaka, Japan

Ken Manabe