Patent ID: 7649749
Filing Date: 2010-01-19
Classification: H01L,H05K

Abstract:
1. A wiring substrate comprising: a base insulating film; a first interconnection formed on a top surface side of the base insulating film; a via conductor provided in a via hole formed in the base insulating film; and a second interconnection provided on a bottom surface side of the base insulating film, the second interconnection being connected to the first interconnection via the via conductor, wherein the wiring substrate comprises a plurality of divided-substrate-unit regions, in each of which the first interconnection, the via conductor, and the second interconnection are formed; the wiring substrate further comprises a warpage-controlling pattern on the base insulating film; and the wiring substrate has a warped shape such that when the wiring substrate is left at rest on a horizontal plate, at least a central part of a plane surface of the substrate contacts the horizontal plate, with both ends of sides of the plane surface being raised, wherein each of the sides extends along a second direction perpendicular to a first direction in the plane surface of the substrate.