| 摘要 |
PROBLEM TO BE SOLVED: To provide a punch die restraining punching flashes while securing the life of the punch die in punching a printed wiring board. SOLUTION: In this punch die 11 used for punching a flexible printed wiring board 50A, corrugated indentations and projections 12 seen from a side are continuously formed on a bottom face of the punch die 11, and the indentations and projections 12 are provided diagonally in parallel seen from a bottom face across the entire bottom face. COPYRIGHT: (C)2008,JPO&INPIT
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