Patent ID: 6335862
Filing Date: 2002-01-01
Classification: H01L,H05K

Abstract:
A multilayer printed wiring board comprising:a surface planar conductor provided on a surface confronting a packaged integrated circuit, and an inner-layer planar conductor provided on an inner layer; first through holes for conducting heat of said surface planar conductor to said inner-layer planar conductor; at least one injection hole for injecting thermally conductive filler between said integrated circuit and said surface planar conductor; filled-state inspection holes for verifying whether said thermally conductive filler that is injected from said injection hole has spread over the necessary area; a heat dissipating planar conductor arranged on an outer layer of said multilayer printed wiring board that is at a location other than the location at which said integrated circuit is mounted and for dissipating heat of said inner-layer planar conductor into the air; and second through holes for thermally connecting said heat dissipating planar conductor and said inner-layer planar conductor.