Patent ID: 7790270
Filing Date: 2010-09-07
Classification: H01L,H05K,Y10T

Abstract:
1. A wiring board comprising a planar resin base material, element connection terminals arranged in a semiconductor element mounting area formed on a first surface of the resin base material and in an area around a periphery of the semiconductor element mounting area, external connection terminals arranged on a second surface of the resin base material and electrically connected to the element connection terminals, a first resin film shaped to cover the first surface of the resin base material, while exposing the element connection terminals and the semiconductor element mounting area, and a second resin film shaped to cover the second surface of the resin base material, while exposing the external connection terminals, wherein the first resin film and the second resin film are different in at least one of a glass transition point, cure shrinkage, and a thermal expansion coefficient.