Patent ID: 8453321

Claim:
A method for manufacturing a multilayer flexible printed circuit board, the method comprising steps of: providing a first substrate, the first substrate including a dielectric layer and a conductive layer formed on the dielectric layer, the first substrate having a main portion and an excess portion; defining a first slit in the dielectric layer of the first substrate from a surface of the dielectric layer facing away from the conductive layer to an opposite surface thereof along a partition line between the main portion and the excess portion; providing a binder layer; defining an opening in the binder layer; providing a second substrate; laminating the first substrate and the second substrate on opposite surfaces of the binder layer in a manner such that a majority of the excess portion of the first substrate is exposed to and suspended above the opening of the binder layer thereby obtaining a semi-finished FPCB; forming a conductive pattern in the conductive layer of the first substrate after laminating the first substrate and the second substrate on the binder layer; defining a second slit in the conductive layer of the first substrate from a surface of the conductive layer away from the dielectric layer to an opposite surface thereof along the partition line between the main portion and the excess portion after forming the conductive pattern in the conductive layer; and cutting the semi-finished FPCB along a peripheral boundary line of the excess portion so as to remove the excess portion of the first substrate, thus a portion of the second substrate being exposed to an exterior through the opening of the binder layer.