Patent ID: 7205230
Filing Date: 2007-04-17
Classification: H01L,H05K

Abstract:
1. A process for manufacturing a wiring board comprising a substrate made of an insulation material and having first and second surfaces, first and second conductor patterns formed on the first and second surfaces, respectively, and a via conductor penetrating the substrate to electrically connect the first conductor pattern with the second conductor pattern; the process comprising the following steps of: forming the substrate with a through-hole penetrating thereto and defining openings at the first and second surfaces, respectively; plating the substrate with a metal so that a metal layer having a predetermined thickness is formed on the respective first and second surfaces of the substrate and the through-hole is substantially filled with the metal to be the via; and emitting a laser beam, as a plurality of spots, around a metal-less portion of the plated metal, at discontinuous positions corresponding to the openings of the through-hole such that the laser beam is not emitted at a point between successive ones of the discontinuous positions, so that a part of the plated metal melts to fill the metal-less portion with the molten metal.