| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilayer printed circuit board in which electric connectability and connection reliability are not lowered by using a core circuit board composed of a metal plate. SOLUTION: A through-hole 32 of the core circuit board 30 is filled with resin 36 to form a through hole 41. The corner of an opening in the through hole 32A of the metal plate 30A is covered with a metal layer 34. The corner does not contact a resin side 36, and no stress concentration occurs in the opening of the through hole 32, so that no crack is generated in the resin 36. COPYRIGHT: (C)2004,JPO |
