Patent ID: RE38961

Claim:
A method for producing semiconductor packages, comprising the steps of : forming electronic circuits for a plurality of semiconductor chips on a surface of a semiconductor wafer; forming substantially columnar shaped bumps on circuit-provided the surface of the semiconductor wafer in accordance with the electronic circuits by a plating method , each bump having an upper end and a height ; screen-printing the bump-provided surface of the semiconductor wafer with a resin sealant to encapsulate the bumps, including their the upper ends of the bumps , and the remaining circuit-provided electronic circuits formed on the surface of the semiconductor wafer with the resin sealant, by placing a metal mask having a single through- hole and a thickness which is larger than the height of each bump over the surface of the semiconductor wafer, thereby forming a sealant layer; curing the sealant layer; grinding the cured sealant layer downward until the upper ends of the bumps become exposed; and placing solder balls on the exposed upper ends of the bumps to weld the balls thereto; and dicing the semiconductor wafer and the sealant layer as an integrated unit into individual semiconductor chips.