Hitachi Cable, Inc.

Shinichi Masui

Hiromitsu Kuroda

Hiroshi Okikawa

Ryohei Okada

Ryuji Nakagawa

Hakaru Matsui

Osamu Seya

Huang Detian

An extra-fine copper alloy twisted wire including a plurality of copper alloy wires with a wire diameter of 0.010 to 0.025 mm twisted together, each of the copper alloy wires including 1 to 3 weight % of silver (Ag) and a balance consisting of a copper and an inevitable impurity, the copper alloy twisted wire further including a tensile strength of not less than 850 MPa, and an electrical conductivity of not less than 85% IACS. The extra-fine copper alloy twisted wire includes a solid insulation with a thickness of not more than 0.07 mm formed on an outer circumference of the extra-fine insulated wire.

Extra-fine copper alloy wire, extra-fine copper alloy twisted wire, extra-fine insulated wire, coaxial cable, multicore cable and manufacturing method thereof

An extra-fine copper alloy wire has: a wire diameter of 0.010 to 0.025 mm; 1 to 3 weight % of silver (Ag), and a balance consisting copper (Co) and an inevitable impurity; a tensile strength of not less than 850 MPa; an electrical conductivity of not less than 85% IACS; an elongation of 0.5 to 3.0%; and a lowering rate in tensile strength of not more than 2%. The lowering rate is represented by [(1&#x2212;&#x3c3;/&#x3c3;)&#xd7;100%] where &#x3c3;is a tensile strength of the wire measured after a heat treatment under conditions of a heating temperature of not more than 350&#xb0; C. and a heating time of not more than 5 seconds, and &#x3c3;is a tensile strength of the wire measured before the heat treatment.

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Tokyo, Japan

Shinichi Masui