Patent ID: 7552531

Claim:
A method of manufacturing a printed wiring board, comprising: providing a first insulating layer having an outer surface and an inner surface, wherein the outer surface and the inner surface of the first insulating layer have a plurality of conductor circuits; forming an opening hole in a inner surface conductor circuit, which is one of the plurality of conductor circuits on the inner surface of the first insulating layer, wherein a center of the opening hole is at a position coincident to a central portion of a bottom of a blind via-hole to be subsequently formed; laminating a second insulating layer to the inner surface of the first insulating layer, wherein the inner surface conductor circuit with the opening hole is between the first insulating layer and the second insulating layer; irradiating a laser beam from the outer surface of the first insulating layer to form the blind via-hole arriving at the inner surface conductor circuit with the opening hole between the first insulating layer and the second insulating layer and the laser beam penetrating into the opening hole such that a surplus hole is formed in the second insulating layer; and forming a metal plated film on the inner surface conductor circuit with the opening hole between the first insulating layer and the second insulating layer and surfaces of the blind via-hole and the surplus hole.