Patent ID: 6395993
Filing Date: 2002-05-28
Classification: H01L,H05K

Abstract:
A multilayer flexible wiring board comprising laminated first and second flexible wiring boards,said first flexible wiring board comprising a first base film, a first wiring film having a first conductive film applied on said first base film and patterned, a contact pad including a part of said first wiring film exposed at a surface, and a non-conductive wall member provided around said contact pad and rising above a top of said contact pad, and said second flexible wiring board comprising a second base film, a second wiring film having a second conductive film applied on said second base film and patterned, and a plurality of bumps connected to said second wiring film, each bump having a top with a surface and exposed at the top, wherein a low-melting metal coating is formed on either of the surface of the part of said first conductive film forming said contact pad or the surface of at least the top of said bump, and said low-melting metal coating melts under heat and then solidifies to connect said contact pad and said bump.