Patent ID: 7503991

Claim:
A film lamination method comprising the steps of: providing a printed board comprising a conductive metal layer with irregularities formed in said conductive metal layer; and applying, upon lamination of a film on said printed board, pressure of 0.1-1 MPa in the direction of thickness of said film disposed on said printed board and sound waves with a predetermined frequency to at least one of said printed board or said film, wherein said film comprises a first layer consisting of a photosensitive resin composition, and wherein the photosensitive resin composition comprises a resin and a photopolymerized compound having at least one intramolecular polymerizable ethylene unsaturated bond, and wherein said film is laminated on said printed board so that said first layer and said conductive metal layer are bonded together along the irregularities formed in said conductive metal layer such that the film is embedded into the irregularities formed in the conductive metal layer.