Patent ID: 6528733
Filing Date: 2003-03-04
Classification: H05K,Y10T

Abstract:
A multi-layer circuit board, comprising:(a) an inner layer circuit board having an inner substrate and an inner layer circuit pattern disposed on at least one surface of said inner layer substrate; (b) a laminated substrate laminated to the surface of said inner layer circuit pattern; and (c) a laminated circuit pattern disposed on the surface of said laminated substrate, wherein said laminated substrate includes a plurality of laminated through conductors; said laminated circuit pattern is electrically connected to said inner layer circuit pattern by a plurality of said laminated through conductors; said inner layer circuit board further includes a smoothing layer; said inner layer circuit pattern is convex in shape, having a predetermined thickness; said smoothing layer is disposed on a concave portion of said inner layer substrate where said inner layer circuit pattern is not formed; and said laminated substrate is laminated to said smoothing layer and said inner circuit pattern.