Patent ID: 6609297
Filing Date: 2003-08-26
Classification: H05K,Y10S,Y10T

Abstract:
A process for producing a multi-layer printed wiring board, which comprises following steps (a) to (c):(a) forming an interlayer insulating resin layer having a metal film, an opening formed on said metal film and a register mark on the surface thereof on a board covered with a conductor layer, (b) removing that part of said interlayer insulating resin layer which is exposed through an opening in said metal film, by irradiation of a laser beam aimed at said opening according to data obtained by sensing the position of said register mark, where the register mark is an opening formed in said metal film and sensing of said register mark is accomplished by sensing said sub-layer mark which is visible in an opening formed in said metal film through said interlayer insulating resin film, thereby forming an opening through which a via hole is formed, and (c) forming via holes and conductor circuits.