Patent ID: 7223687

Claim:
A method of fabricating printed wiring boards, comprising the following steps: providing a carrier plate having a first supporting surface and an opposite second supporting surface, the first supporting surface having a first release region and a first bonding region, and the second supporting surface having a second release region and a second bonding region; arranging a first release layer and a second release layer on the first release region and the second release region, respectively; arranging a first dielectric layer and a second dielectric layer on the first release layer and the second release layer, respectively; arranging a first conductive layer and a second conductive layer on the first dielectric layer and the second dielectric layer, respectively; bonding a portion of the first dielectric layer bypassing the first release layer to the first bonding region, and bonding a portion of the second dielectric layer bypassing the second release layer to the second bonding region; forming a first build-up wiring structure and a second build-up wiring structure on the first conductive layer and the second conductive layer, respectively; removing a section which the first dielectric layer bonds to the first bonding region and a section which the second dielectric layer bonds to the second bonding region; and releasing the first dielectric layer and the second dielectric layer from the first release region and the second release region, respectively, such that a first printed wiring board comprising the first dielectric layer, the first conductive layer and the first build-up wiring structure, and a second printed wiring board comprising the second dielectric layer, the second conductive layer and the second build-up wiring structure are formed.