Patent ID: 8745863
Filing Date: 2014-06-10
Classification: H01L,H05K,Y10T

Abstract:
1. A method of manufacturing a multi-layer printed circuit board, comprising: forming a plurality of first penetrating openings each having a small diameter in a central portion of a substrate such that the plurality of first penetrating openings penetrates through the substrate; forming a plurality of second penetrating openings each having a large diameter in an outer peripheral portion of the substrate such that the plurality of second penetrating openings penetrates through the substrate; forming a conductive film on a side wall of each of the first penetrating openings such that a plurality of first through hole conductors is formed in the first penetrating openings, respectively; forming a conductive film on a side wall of each of the second penetrating openings such that a plurality of second through hole conductors is formed in the second penetrating openings, respectively; filling a resin filler material into a space formed by the conductive film of each of the first through hole conductors such that the plurality of first through hole conductors is filled by the resin filler; and filling a resin filler material into a space formed by the conductive film of each of the second through hole conductors such that the plurality of second through hole conductors is filled by the resin filler.