Patent ID: 8800143
Filing Date: 2014-08-12
Classification: H05K,Y10T

Abstract:
1. A method of manufacturing a multi-layer printed wiring board, comprising: forming a core substrate; forming a first interlayer insulation layer over the core substrate; forming a first filled via in the first interlayer insulation layer such that the first filled via has a bottom portion having a first diameter; forming a first coarse surface on the first filled via such that an entire exposed surface of the first filled via has the first coarse surface; forming a second interlayer insulation layer over the first interlayer insulation layer; forming a second filled via in the second interlayer insulation layer such that the second filled via has a bottom portion having a second diameter smaller than the first diameter; and forming a second coarse surface on the second filled via such that an entire exposed surface of the second filled via has the second coarse surface.