Patent ID: 6798072
Filing Date: 2004-09-28
Classification: H01L

Abstract:
Flip chip assembly structure comprising:a semiconductor chip having a circuit for processing electrical signals; electrodes provided on said semiconductor chip; bumps which are respectively formed on said electrodes; internal connection terminals through which the electrical signal is fetched via the associated ones of said bumps from the associated ones of said electrodes; and a printed circuit board having said internal connection terminals provided thereon, wherein said bumps each have a stepped projection shape in which a step adjacent to a corresponding one of said internal connection terminals has a diameter which is one half or less the diameter of a step adjacent a corresponding one of said electrodes, wherein said stepped projection shape of each of said bumps is a two step projection shape, wherein a semi-cured resin sheet which is softened by the application of heat is inserted into a space defined between said semiconductor chip and said printed circuit board, and said bumps and said internal connection terminals are metallically joined to each other by the application of a load, the heat and ultrasonic wave vibration to press the bumps through said softened resin sheet to be metallically joined with said internal connection terminals.