Patent ID: 6222272
Filing Date: 2001-04-24
Classification: H01L,H05K

Abstract:
A semiconductor device comprising a film carrier comprising:a conductive circuit of 1-200 .mu.m thickness formed inside an insulating substrate, wherein the insulating substrate is made from a thermosetting resin or thermoplastic resin, has a thickness of 2-500 .mu.m, and has flexibility;and the insulating substrate having at least one opening on at least one side thereof where the conductive circuit is formed; wherein the opening comprises a through-hole that extends from a surface of the substrate to a surface of the conductive circuit and wherein the conductive circuit has a concave face about the opening at a lower end of the through-hole, in a diameter equally extended all around said opening,and wherein the conductive path protrudes from the surface of the insulating substrate;and wherein the opening is filled with a conductive material to form a conductive path,and wherein the concave face satisfies the following:(A) Y.ltoreq.Z/2, wherein, considering a cross-sectioned thickness of the substrate and the conductive path, Y is a length of the conductive circuit from the through-hole lower end to a concave-most point of the concave face, and Z is a thickness of the conductive circuit at a point other than where the conductive circuit has the concave face;(B) X.ltoreq.W/2, wherein X is a distance from the through-hole lower end to an outer periphery of the concave face at a point where the concave face of the conductive circuit contacts the substrate, and W is a distance from the through-hole lower edge extended linearly along X to a point where the conductive circuit ends; and(C) 1/3.ltoreq.X/Y.ltoreq.1;wherein the protrusion has a height of 3-30 .mu.m.