MANUFACTURE OF PRINTED WIRING BOARD

摘要

PURPOSE:To surely prevent a connection failure from occurring between an inner conductor circuit and a through-hole so as to improve a printed wiring board in connection reliability. CONSTITUTION:A through-hole forming hole 3 is bored in a board 1 provided with an inner conductor circuit 1a. Copper plating 4 is deposited on a part of the inner conductor circuits 1a exposed out of the inner wall of the through- hole forming hole 3. Pd catalyst nuclei 5 are applied onto the inner wall surface 3a of the through-hole forming hole 3, and a through-hole plating 7 is deposited on all the inner wall surface 3a of the through-hole forming hole 3 by electroless copper plating.