Patent ID: 6323434
Filing Date: 2001-11-27
Classification: H01L,H05K

Abstract:
A circuit substrate for mounting an IC device on a mother board substrate, comprising:a first insulating base made of a polyimide obtained by terminating imidation reaction of a polyamide acid as a precursor for the polyimide,a conductive circuit formed on said first insulating base,a second insulating base formed on said first insulating base carrying said conductive circuit and made of a polyimide obtained by terminating imidation reaction of a polyamide acid as a precursor for the polyimide,an electrode for connection to the mother board substrate, which is connected to said conductive circuit and projects from said first insulating base, andan electrode for connection to the IC, which is connected to said conductive circuit and projects from said second insulating base wherein said conductive circuit is not bonded to said insulating base.