Patent ID: 9144157
Filing Date: 2015-09-22
Classification: H05K

Abstract:
1. A manufacturing method of a printed wiring board comprising: forming a laminate having a structure in which a copper foil layer formed using copper foil without roughening treatment having surface roughness (Rzjis) at a bonding surface of 2 μm or less and thickness of 5 μm or less is laminated to a conductive layer via an insulating layer; providing a blind-hole composed of a hole perforating the copper foil layer and the insulating layer; and a bottom composed of the conductive layer in the laminate; providing an electroless-plated copper layer on a surface of the copper foil layer and an inner wall of the blind-hole; providing an electro-plated copper layer on a surface of the electroless-plated copper layer to make the total thickness of a copper layer provided on the insulating layer 10 μm or less, and filling-up the blind-hole to a level substantially even with a surface of the electro-plated copper layer by an electro-plated copper; providing an etching resist layer having thickness of 15 μm or less on a surface of the electro-plated copper layer; and etching the copper layer not covered with the etching resist layer to form a wiring pattern.