Patent ID: 7581312

Claim:
A method for manufacturing a multilayer flexible printed circuit board, the method comprising steps of: providing a first copper clad laminate, a second copper clad laminate and a binder layer, the first copper clad laminate and the second copper clad laminate each including at least one single-sided copper clad laminate, the at least one single-sided copper clad laminate including a dielectric layer and a conductive layer formed on the dielectric layer, the first copper clad laminate having an excess portion; defining an opening in the binder layer; defining a first slit in the first copper clad laminate along a boundary of the excess portion of the first copper clad laminate; laminating the first copper clad laminate, and the second copper clad laminate on opposite sides of the binder layer in a manner such that a majority of the excess portion of the first copper clad laminate is exposed to and suspended above the opening of the binder layer; forming a via hole for establishing an electric connection between the first copper clad laminate and the second copper clad laminate; defining a second slit in the first copper clad laminate along the boundary of the excess portion of the first copper clad laminate so as to remove the excess portion of the first copper clad laminate, thus a portion of the second copper clad laminate being exposed to an exterior through the opening of in the binder layer.