Patent ID: 7240429

Claim:
A method for manufacturing a printed circuit board comprising: a forming step of forming a conductor pattern on a surface of a resin film made of a thermoplastic resin while forming a via-hole in said resin film to form each of a plurality of conductor pattern forming films, each conductor pattern forming film including said resin film and said conductor pattern with said via-hole; a filling step of filling said via-holes formed in said resin films with conductive paste formed of tin grains and silver grains mixed with an organic solvent; a preparing step of preparing a ceramic substrate; a laminating step of laminating said conductor pattern forming films and said ceramic substrate to obtain a laminated body; and a bonding step of bonding said conductor pattern forming films and said ceramic substrate by heating and pressing said conductor pattern forming films and said ceramic substrate from both sides of said laminated body to obtain a resin base layer integrally laminated on said ceramic substrate such that said conductor patterns formed on each pair of resin films adjacent to each other are electrically connected with each other through said conductive paste filled in one of said resin films, wherein: said forming step includes forming each via-hole which has a bottom defined by said corresponding conductor pattern, said preparing step includes printing and sintering a conductor paste on a flat surface of said ceramic substrate to form a printed resistor and a printed conductor pattern connected with said printed resistor on said flat surface of said ceramic substrate, said laminating step includes laminating said conductor pattern forming films and said ceramic substrate so as to place said printed resistor and said printed conductor pattern between said ceramic substrate and one of said conductor pattern forming films, and said bonding step includes fusing and integrating said resin films of said conductor pattern forming films into a resin base layer so as to cover said printed resistor and said printed conductor pattern formed on said ceramic substrate with said thermoplastic resin of said resin base layer such that said printed conductor pattern is electrically connected with the conductor patterns of said conductor pattern forming films only through said conductive paste filled into said via-holes.