Patent ID: 6391422
Filing Date: 2002-05-21
Classification: H01L,Y10S,Y10T

Abstract:
A wiring substrate comprising:a wiring substrate body having a main surface; and a metallic plate formed from a rolled metallic sheet so as to define a rolling direction of the metallic plate, and having a boundary profile, in a plan view, which is identical to, or smaller than, that of the wiring substrate body, the metallic plate being bonded to the wiring substrate body within the main surface of the wiring substrate, the rolling direction of the metallic plate intersecting, at an angle, a first direction of the boundary profile of the metallic plate that extends perpendicular to two parallel lines which are separated by a perpendicular distance therebetween and which contact and enclose therebetween the boundary profile of the metallic plate in such a manner as to maximize the perpendicular distance between the two lines.