Patent ID: 7356917
Filing Date: 2008-04-15
Classification: H05K,Y10T

Abstract:
1. A method for manufacturing a multi-layer printed circuit board, the method comprising the steps of: preparing a strip-shaped conductive pattern film by forming a strip-shaped conductive pattern made of metallic film on a resin film made of thermoplastic resin; preparing a pair of grounding conductive pattern films each of grounding conductive pattern film formed by a wide grounding conductive pattern made of metallic film on a resin film made of thermoplastic resin; preparing a spacer film including a resin film made of thermoplastic resin without any conductive pattern disposed on a part of the surface of the resin film of the spacer film, the part corresponding to the grounding conductive pattern; preparing at least one surface conductive film by forming a surface conductive pattern made of metallic film on a resin film made of a thermoplastic resin; laminating the strip-shaped conductive pattern film, the spacer film and the grounding conductive pattern films in such a manner that: bonding each resin film together by heating and pressurizing the laminates of the surface conductive film, the strip-shaped conductive pattern film, the spacer film and the grounding conductive pattern films, wherein each grounding conductive pattern and strip-shaped conductive pattern provide a high-frequency conductive pattern for providing a high frequency circuit, and wherein each of the grounding conductive patterns and strip-shaped conductive pattern has a surface roughness, which is smaller than a surface roughness of the surface conductive pattern on a resin film side, disposed on an outer surface of the multi-layer printed circuit board.