Hitachi Cable, Inc.

The Furukawa Electric Co., Ltd.

Kenji Yokomizo

Yasuyuki Ito

Hiroki Tanaka

Yoshihiro Arashitani

Katsumi Nomura

Tomohiro Ishimura

Yutaka Hoshino

Hirotaka Watanabe

Katsuyuki Matsumoto

Takemi Muroga

Yoshiki Yamamoto

Yasuhiro Kusano

Koji Aoyagi

Takeshi Yagi

Shunichi Matsushita

Masaki Iwama

Noboru Hagiwara

Tadao Otani

Eisuke Otani

Shingo Watanabe

Muneo Kodaira

Hiroyuki Ogawara

Shinichiro Shimizu

Makoto Ohba

Koji Nukaga

Provided is an optical fiber ribbon and an optical fiber cable, which are adaptable to manufacture at a high velocity, in the intermittent connecting type optical fiber ribbon obtained by adhering and connecting adjacent colored optical fibers by intermittent connecting portions. In an optical fiber ribbonof the present invention, since, in addition to polyol having a weight average molecular weight in a specific range, rheology control agent is contained in a specific range in a material forming an intermittent connecting portion, the Newtonian region between a low shear rate region and a high shear rate region of the material forming the intermittent connecting portioncan be adjusted. Thus, scattering of the material due to a centrifugal force generated by rotation of an application roll that applies the material at the time of manufacture and the like can be suppressed, and the application amount to colored optical fibercan be stabilized. In addition, the optical fiber ribboncan maintain suppression of such scattering and the like even in the manufacture at a high linear velocity.

Optical fiber ribbon and optical fiber cable

A method for manufacturing an intermittent bonding type optical fiber ribbon which is capable of forming non-connection portions and intermittent connection portions between adjacent coated optical fibers formed into an optical fiber ribbon by performing a laser processing for the ribbon through irradiation with a pulse laser light, thereby making it possible to rapidly form the intermittent connection portions and the non-connection portions while maintaining high linear velocity of the coated optical fiber. The non-connection portions and the intermittent connection portions are formed in the obtained intermittent bonding type optical fiber ribbon through the irradiation with the pulse laser light, so the intermittent bonding type optical fiber ribbon becomes the intermittent bonding type optical fiber ribbon, which is capable of securing operability during collective connection and surely being subjected to an intermediate branching without damaging cable characteristics during high density mounting.

Method for manufacturing intermittent bonding type optical fiber ribbon and intermittent bonding type optical fiber ribbon

An optical fiber ribbon is intermittently connected in a length direction by an intermittent connection which includes a polyol having a weight-average molecular weight of 3000 to 4000 in a specific amount relative to the entire intermittent connection and which has Young's modulus at 23&#xb0; C. within a specific range. When collectively unitizing optical fiber ribbons to form an optical fiber cable, an optical fiber ribbon is formed which maintains advantages of the optical fiber ribbon and which prevents cracks of the intermittent connection and detachment of the intermittent connection from a colored optical fiber core when the cable is subjected to repetitive ironing.

A rolled copper foil according to the present invention includes a crystal grain alignment wherein: when normalized intensity of {200}plane diffraction of a copper crystal in results obtained by an X-ray diffraction pole figure measurement with respect to a rolled surface is plotted against at different values of angle &#x3b1;, the normalized intensity being obtained during a &#x3b2; scanning in the pole figure measurement, a ratio of a maximum value A of the normalized intensity with angle &#x3b1; in a range of 40&#xb0; to 60&#xb0; to a maximum value B of the normalized intensity with angle &#x3b1; in a range of 80&#xb0; to 90&#xb0; is equal to or greater than 4; and when the normalized intensity increases with increasing angle &#x3b1; in a range of 25&#xb0; to 45&#xb0;, there is essentially no area in which the normalized intensity increases stepwise.

Rolled copper foil

A nickel plating solution preparation method has the steps of: dissolving in water 100 g/L or more and less than 200 g/L of nickel sulfate, and 10 g/L or more and less than 30 g/L of sodium citrate or 8 g/L or more and less than 25 g/L of citric acid, but adding no nickel chloride; and adjusting a pH of the resultant solution to 2 or more and less than 4. Another nickel plating solution preparation method has the steps of: dissolving in water 100 g/L or more and less than 200 g/L of nickel sulfate, and 10 g/L or more and less than 30 g/L of sodium citrate or 8 g/L or more and less than 25 g/L of citric acid, but adding no boric acid; and adjusting a pH of the resultant solution to 2 or more and less than 4.

Nickel plating solution and its preparation method, nickel plating method and printed wiring board copper foil

A rolled copper foil applied with a recrystallization annealing after a final cold rolling step and having a crystal grain alignment satisfying a ratio of [a]/[b]&#x2267;3, where [a] and [b] are normalized average intensities of a {111}plane diffraction of a copper crystal by &#x3b2;-scanning at &#x3b1;=35&#xb0; and 74&#xb0;, respectively, in an X-ray diffraction pole figure measurement to a rolled surface is manufactured by controlling a total working ratio in the final cold rolling step before the recrystallization annealing to be 94% or more; and controlling a working ratio per one pass in the final cold rolling step to be 15 to 50%.

Rolled copper foil and manufacturing method thereof

A copper foil for a printed circuit board has a rust preventing layer formed by a trivalent chromium chemical conversion treatment on a surface of the copper foil that the copper foil is bonded to a base material for the printed circuit board. T copper foil is of copper or copper alloy, and the rust preventing layer contains 0.5 to 2.5 &#x3bc;g/cmof chromium converted into metallic chromium.

Copper foil for printed circuit board with taking environmental conservation into consideration

A modified cross-section material having a thin part and a thick part in its widthwise direction is manufactured through a plurality of roll stages. Each rolling stage comprises of a set of a convex roll and a flat roll, wherein the convex roll has a convex part. The thin part is formed in accordance with the lengthwise expansion by the convex part of the convex roll, and the thick part is formed in accordance with the lengthwise expansion by a part other than the convex part of the convex roll.

Method of manufacturing modified cross-section material

Growing community of inventors

Tokyo, Japan

Kenji Yokomizo