Patent ID: 6761790
Filing Date: 2004-07-13
Classification: H05K,Y10S,Y10T

Abstract:
A method of manufacturing a wiring board, comprising the steps of:forming a through hole on a prepreg including a releasing resin film on at least one of its surfaces, the prepreg being obtained by impregnating a porous film having a thickness of 5 to 90 &mgr;m and a porosity of 30 to 98% with a half cured thermosetting resin; filling said through hole with a conductive paste containing a conductive filler; peeling said releasing resin film; laminating a metal foil on a surface from which said releasing resin film is peeled; and heating and pressurizing the laminated product, wherein said porous film has a sponge structure with a three-dimensional bone, and a mean pore diameter in a section thereof is 0.01 to 1 &mgr;m and is smaller than a mean particle diameter of said conductive filler.