PRINTED-CIRCUIT BOARD, MULTILAYER PRINTED-CIRCUIT BOARD AND METHOD OF MANUFACTURE THEREOF

摘要

Metallic conductors (14) are filled into via holes of a printed circuit board (30), and the conductors are covered with diffusing metal (16) on one end. The ends of the conductors are pressed against conducting circuits (51, 52) on another circuit board for thermocompression bonding. As a result, the metal on the ends of the metallic conductors diffuses into the metal of conductor circuits (51, 52) and forms alloy layers in the interface. This increases the reliability of electrical connections between layers.