Patent ID: 8298945
Filing Date: 2012-10-30
Classification: B32B,H01L,H05K,Y10T

Abstract:
1. A method of manufacturing a substrate having a core, m buildup layers on a first surface of said core and n buildup layers on a second surface of said core, wherein each of said buildup layers comprises a dielectric layer, and a conductive layer thereon, and where m>n, said method comprising: forming (m−n) of said m buildup layers on said first surface, wherein forming each of said (m−n) of said m buildup layers comprises drilling and desmearing a respective dielectric layer; and after said forming (m−n) buildup layers, additionally forming n pairs of buildup layers, each of said n pairs comprising one of said n buildup layers formed on said second surface and one of the remaining n of said m buildup layers formed on said (m−n) buildup layers on said first surface, and wherein said forming each of said n pairs of buildup layers comprises drilling each one of a respective pair of dielectric layers, and desmearing said respective pair of dielectric layers concurrently.