| 摘要 |
PROBLEM TO BE SOLVED: To provide copper foil suitable for an FPC having a bend part. SOLUTION: The copper foil is used as a wiring member of a flexible printed wiring board which includes a flexible resin substrate and wiring formed from the copper foil, and for which a ridge line in at least one bend part of the wiring forms an angle of 2.9-87.1° with the length direction of the copper foil. When the heat treatment of 360°C×6 minutes is performed to recrystallize the copper foil, a cube texture for which the intensity (I) of a (200) plane obtained by X-ray diffraction in a thickness direction is I/I<SB POS="POST">0</SB>≥25 to the intensity (I<SB POS="POST">0</SB>) of the (200) plane obtained by the X-ray diffraction of fine powder copper is developed. Further, elongation characteristics for which elongation in a direction of 45° to the length direction of the copper foil is equal to or more than four times of the elongation in a direction of 0° and 90° to the length direction of the copper foil are developed. COPYRIGHT: (C)2012,JPO&INPIT |
