Patent ID: 6157084
Filing Date: 2000-12-05
Classification: H01L,H05K

Abstract:
A film carrier comprising a conductive circuit embedded in a flexible insulator layer without being exposed at a surface of said flexible insulator layer, and conductive paths reaching both surfaces of said flexible insulator layer from said conductive circuit;wherein said flexible insulator layer is formed from a thermosetting resin or thermoplastic resin;wherein the conductive paths are formed in plural pairs, the paired conductive paths are attached to opposite surfaces of said conductive circuit and are positioned on the conductive circuit so that they are not directly opposite to each other; said flexible insulator layer having an inner surface side permitting contact with a semiconductor element and an outer surface side permitting contact with an external substrate;and wherein the pitch of the pair of conductive paths on the outer surface side of the conductive circuit is narrower than the pitch of the pair of conductive paths on the inner surface side of the conductive circuit.