| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent the exuding of resin into a flexure at the time of building up a build-up resin layer on a rigid-flex substrate while minimizing an increase in the number of processes and putting as little restriction on design as possible. SOLUTION: A single-sided copper foil-attached resin sheet 30 is used as the build-up resin. At the time of forming an opening 33 by punching, a flange 34 for coating an end face 31A of the opening of the resin sheet 31 is formed from a copper foil 32 of the single-sided copper foil-attached resin sheet 30 at the edge of the opening 33 by hole flange processing. The flange 34 prevents the exuding of resin into the flexible portion. COPYRIGHT: (C)2006,JPO&NCIPI |
