Hitachi Cable, Inc.

Shigetoshi Goto

Seigi Aoyama

Ryohei Okada

Takaaki Ichikawa

Osamu Seya

Hakaru Matsui

Hiroshi Komuro

Koichi Tamura

In an extrafine or ultrafine copper alloy wire having an outer diameter of not more than 0.1 mm, the copper alloy wire is formed of a heat treated copper alloy comprising 0.05 to 0.9% by weight in total of at least one metallic element selected from the group consisting of tin, indium, silver, antimony, magnesium, aluminum, and boron and not more than 50 ppm of oxygen with the balance consisting of copper. By virtue of this constitution, the extrafine or ultrafine copper alloy wire has a combination of excellent bending fatigue lifetime based on high tensile strength and excellent torsional strength based on high elongation or a combination of excellent tensile strength, electrical conductivity, and drawability and good elongation. The invention has been described in detail with particular reference to preferred embodiments, but it will be understood that variations and modifications can be effected within the scope of the invention as set forth in the appended claims.

Extrafine copper alloy wire, ultrafine copper alloy wire, and process for producing the same

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Ibaraki, Japan

Shigetoshi Goto