Patent ID: 7186925

Claim:
An electronic circuit device comprising: an electronic component having a connection terminal on one side thereof; a circuit board made of a polymeric resin sheet having a thickness of from 50μm to 400μm and having an electrode pad thereon; an adhesive sheet having a through-hole; and a conductive adhesive filled in said through-hole, wherein said electronic component and said circuit board are bonded to each other via said adhesive sheet, and said connection terminal on said electronic component and said electrode pad on said circuit board are bonded to each other by said conductive adhesive filled in said through-hole, and wherein a cross-sectional size of said connection terminal is less than a corresponding cross-sectional size of said through-hole, and said corresponding cross-sectional size of said through-hole is less than a corresponding cross-sectional size of said electrode pad, with said corresponding cross-sectional size of said electrode pad being at least twice as large as said cross-sectional size of said connection terminal.