Patent ID: 8387241
Filing Date: 2013-03-05
Classification: H05K,Y10T

Abstract:
1. A method of fabricating a wiring board including at least one conductor layer and at least one resin insulating layer, the method comprising: a through hole forming step of forming a through hole in said resin insulating layer by irradiating said resin insulating layer with one of a carbon dioxide gas laser and a UV laser; a wiring groove forming step of forming, after the through hole forming step, a wiring groove in said resin insulating layer by irradiating a surface of said resin insulating layer with a laser, wherein irradiating the surface of said resin insulating layer with the laser removes a residue of said resin insulating layer which remains at a bottom of said through hole; a via conductor forming step of forming a via conductor in said through hole; and a wiring layer forming step of forming said conductor layer such that at least a portion of said conductor layer is embedded in said wiring groove to form a wiring layer in said wiring groove.