Patent ID: 7485200

Claim:
A method of manufacturing a copper alloy, the method comprising at least: a first step of subjecting a base metal comprising a copper alloy containing at least zirconium in an amount of not less than 0.005% by weight and not greater than 0.5% by weight to a solution treatment or a hot rolling treatment, and a second step of subjecting the base metal, which has gone through the first step, to cold rolling at a rolling reduction of not less than 90% so as to obtain a copper alloy comprising: a first grain group comprising grains having a grain size of not greater than 1.5 μm, a second grain group comprising grains having a grain size of greater than 1.5 μm and less than 7 μm, said grains having a form which is elongated in one direction, and a third grain group comprising grains having a grain size of not less than 7 μm; such that where α is a total area ratio of the first grain group, β is a total area ratio of the second grain group, and γ is a total area ratio of the third grain group, based on a unit area, α+β+γ=1, the sum of α and β is greater than γ, and α is less than β.