The Furukawa Electric Co., Ltd.

Furukawa Automotive Systems Inc.

Kazuhiko Asami

Kazuo Yoshida

Naoko Aimiya

Ryuji Nishida

A rolled copper foil composed of crystal particles of copper or a copper alloy, wherein an average particle size of the crystal particles composing the outermost surface is not less than 0.2 &#x3bc;m and not greater than 6 &#x3bc;m; a ratio of the average particle size of the crystal particles composing the outermost surface to a thickness of the rolled copper foil is not less than 1% and not greater than 6%; and an intragranular distortion rate found by the following formula (1) when a cross-section perpendicular to a length direction of the rolled copper foil is analyzed by electron backscatter diffraction (EBSD) is not less than 0.5% and not greater than 10%:Intragranular distortion rate (%)=(A)/(B)&#xd7;100&#x2003;&#x2003;Formula (1)in the above formula (1), (A) represents the area of a region identified through image analysis to have an orientation difference of not less than 1 degree and not greater than 15 degrees, and (B) represents the area of a region identified through image analysis to have an orientation difference of not less than 0 degrees and not greater than 15 degrees.

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Shiga, Japan

Kazuhiko Asami