Patent ID: 6687985
Filing Date: 2004-02-10
Classification: H01L,H05K,Y10T

Abstract:
A method of manufacturing a multi-layer circuit board, which comprises the steps of:(a) forming a base board by laminating a plurality of resin-impregnated-fiber-sheets respectively having wiring layers on surfaces thereof and inner-via-hole conductors therein; (b) forming a container board by laminating a plurality of resin-impregnated-fiber-sheets respectively having wiring layers on the surfaces thereof, inner-via-hole conductors therein, and at least one opening therethrough; (c) forming a mother board having at least one cavity by laminating said base board and said container board; (d) forming a carrier board by laminating a resin-impregnated-fiber-sheet having at least one land and at least one wiring on the surface thereof, and a plurality of resin-impregnated-fiber-sheets respectively having inner-via-hole conductors therein; (e) locating said carrier board in said cavity of said mother board; and (f) electrically connecting said carrier board to said mother board, wherein a wiring density formed on the carrier board is different from the wiring density formed on the mother board.