Patent ID: 6750132
Filing Date: 2004-06-15
Classification: H01L,H05K

Abstract:
A flip-chip packaging method for attaching a semiconductor element to a circuit board with conductive resin, said element having protruding electrodes thereon, the method comprising:printing an electrode material containing photopolymerizable materials on a semiconductor element package region on said circuit board such that a film is formed with a prescribed thickness, and allowing said electrode material film to remain only on prescribed electrode areas, said remaining electrode material film, after having been exposed and developed, resulting in remaining areas of said electrode material film whose thickness in cross section is trapezoidal and widens in an outward direction from an interface of said remaining areas with the circuit board; baking said trapezoidal electrode material remaining areas to form concave circuit electrodes having edges warped in a direction away from the circuit board surface; and bringing said protruding electrodes formed on said semiconductor element into abutment with concave faces of said concave circuit electrodes, and connecting said protruding electrodes and said circuit electrodes with each other via the conductive resin.