Patent ID: 9357647
Filing Date: 2016-05-31
CPC Classification: H01L,H05K

Claim Text:
1. A method for manufacturing a packaging substrate, comprising: laminating a third copper foil, a second adhesive sheet, a first supporting sheet, a first adhesive sheet, a second supporting sheet, a third adhesive sheet and a fifth copper foil together in that order to form a supporting substrate; forming a plurality of first connecting pads on the third copper foil, and forming a plurality of second connecting pads on the fifth copper foil; forming a first solder ball on each of the first connecting pads, and forming a second solder ball on each of the second connecting pads; laminating a first resin coated copper foil on the first solder balls, and a second resin coated copper foil on the second solder balls, the first resin coated copper foil comprising a seventh copper foil and a first resin layer formed on the seventh copper foil, the first resin layer covering surfaces of the first solder balls and filling gaps between the first solder balls, terminal portions of the first solder balls further away from the first connecting pads contacting and electrically connected to the seventh copper foil, the second resin coated copper foil comprising an eighth copper foil and a second resin layer formed on the eighth copper foil, the second resin layer covering surfaces of the second solder balls and filling the gap between the second solder balls, terminal portions of the second solder balls further away from the second connecting pads contacting and electrically connected to the eighth copper foil; etching the seventh copper foil to form a patterned first wiring layer, and etching the eighth copper foil to form a patterned second wiring layer; forming a first solder mask layer on the first wiring layer, and forming a second solder mask layer on the second wiring layer, thereby obtaining a multi-layer structure, the first solder mask defining a plurality of third openings, portions of the first wiring layer exposed through the third openings serving as first contact pads, the second solder mask defining a plurality of fourth openings, portions of the second wiring layer exposed through the fourth openings serving as second contact pads; removing the first adhesive sheet, thereby obtaining a first packaging substrate and a second packaging substrate.