Patent ID: 11990349

Abstract:
A method for manufacturing a package substrate including an insulating layer and a wiring conductor, including: forming, on one or both sides of a core resin layer, a substrate including a peelable first metal layer that has a thickness of 1-70 μm, a first insulating resin layer, and a second metal layer; forming a non-through hole reaching a surface of the first metal layer, performing electrolytic and/or electroless copper plating on its inner wall, and connecting the second and first metal layers; arranging a second insulating resin layer and a third metal layer and heating and pressurizing the first substrate to form a substrate; forming a non-through hole reaching a surface of the second metal layer, performing electrolytic and/or electroless copper plating on its inner wall, and connecting the second and third metal layers; peeling a third substrate; and patterning the first and third metal layers to form the wiring conductor.