2-layer flexible printed wiring board and manufacturing method of the two-layer flexible printed wiring board

摘要

PROBLEM TO BE SOLVED: To provide a flexible printed circuit board excellent in bending characteristics obtained from a flexible copper lining laminated board using an electrolytic copper foil.;SOLUTION: The two-layered flexible printed circuit board provided with a wire formed by etching the electrolytic copper foil on the surface of a resin film layer, wherein an initial precipitated crystal layer 1 at the time of manufacturing the electrolytic copper foil is removed from the wiring, and a normally precipitated crystal layer 2 is merely included is adopted. In addition, it is preferable that a deviation between the neutral line of a cross-section thickness in the two-layered flexible printed circuit board and that of the wiring thickness is within 5% of a total thickness in the two-layered flexible printed circuit board or the like, if the two layered flexible printed circuit board is provided with a cover lay film layer.;COPYRIGHT: (C)2007,JPO&INPIT