Patent ID: 6715204
Filing Date: 2004-04-06
Classification: H01L,H05K,Y10T

Abstract:
A method for manufacturing a printed circuit board comprising the steps of:coating a lower surface and an upper surface of an insulative substrate respectively with a lower surface metal foil and an upper surface metal foil, the thickness of which is less than that of the lower surface metal foil; forming an opening in the upper surface metal foil at a location corresponding to a blind via hole formation portion of the insulative substrate; forming a blind via hole, the bottom of which is the lower surface metal foil, by emitting a laser against the blind via hole formation portion through the opening; applying a conductor to the blind via hole; and forming an upper surface pattern and a lower surface pattern by respectively etching the upper surface metal foil and the lower surface metal foil, wherein the upper surface and lower surface metal foil coating step includes a step of coating the upper surface and the lower surface, respectively, with an upper surface metal foil and a lower surface metal foil that have the same thickness, and a step for etching the upper surface metal foil.