| 摘要 |
PROBLEM TO BE SOLVED: To provide a two layer flexible board which is superior in adhesiveness of an insulator film and a ground metal layer and corrosion resistance, and in which a copper coat layer having high insulation reliability is formed without missing of copper coat part due to a pin hole which occurs, when the ground metal layer is formed. SOLUTION: In the two layer flexible board, the ground metal layer with a film thickness of 3 to 50 nm, which mainly contains nickel-titanium-chromium alloy where a rate of titanium is 3 to 22 weight%, a ratio of chromium is 5 to 22 weight% and remaining part being nickel is formed on at least one face of the insulator film by a dry plating method without through adhesive, and the copper coat layer is formed on the ground metal layer by the dry plating method. COPYRIGHT: (C)2006,JPO&NCIPI
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