Patent ID: 8221897

Claim:
A rolled copper foil obtained after a final cold rolling step but before a recrystallization annealing step, and having a crystal grain alignment in which, in results obtained by an X-ray diffraction pole figure measurement with respect to a rolled surface of the rolled copper foil, the crystal grain alignment indicates a ratio of A/B≧4, where A and B are local maximum values of normalized intensities of a {200} Cu plane diffraction of a copper crystal, which are respectively obtained by β-scanning of an in-plane rotation axis within an α-angle range of a deflection axis from 40° to 60° and another α-angle range from 80° to 90°; and there is essentially no area increasing the normalized intensity of the {200} Cu plane diffraction stepwise from α-angle of 25° to α-angle of 45°.