Patent ID: 8152953

Claim:
A method of making a printed wiring board, comprising: setting an adhesive sheet made of a thermosetting resin between a first substrate and a second substrate so that a first electrically-conductive land provided on the first substrate is opposed to a second electrically-conductive land provided on the second substrate through an opening formed in the adhesive sheet; filling the opening with an electrically-conductive binder including matrix material and fillers, the matrix material containing a thermosetting resin, the fillers including copper particles each coated with a tin bismuth alloy, the fillers dispersed in the matrix material so as to unite with the first and second electrically-conductive lands based on intermetallic compounds formed between the fillers and the first and second electrically-conductive lands, respectively; pressing the first substrate against the second substrate with heating to soften the adhesive sheet; and melting the tin bismuth alloy having a melting point higher than a softening temperature of the adhesive sheet by heating after the adhesive sheet has been softened; heating and hardening the matrix material after the tin bismuth alloy has molten; and heating and hardening the adhesive sheet after the matrix material has been hardened.