Patent ID: 11683891

Abstract:
A method of inspecting a printed wiring board includes preparing a printed wiring board having product and inspection regions such that the board has inner-layer lands in the regions, forming vias on the inner-layer lands in the regions, forming outer peripheral part(s) in the wiring board such that the outer peripheral part(s) expose outer peripheral portion(s) of the inner-layer land in the inspection region, determining a center coordinate of the inner-layer land in the inspection region based on a position of the outer peripheral part(s), determining a center coordinate of the via(s) in the inspection region based on a shape of the via(s) in the inspection region, determining a misalignment amount based on a distance between the center coordinate of the inner-layer land and the center coordinate of the via(s) in the inspection region, and determining alignment accuracy between the via and the inner-layer land based on the misalignment amount.