Patent ID: 6411519
Filing Date: 2002-06-25
Classification: H01L,H05K

Abstract:
A package board comprising:a core board, the core board having an IC chip side surface and an other surface opposed to the IC chip side surface; a first plurality of conductor circuits formed on the IC chip side surface and a second plurality of conductor circuits formed on the other surface, the first plurality of conductor circuits being constructed and adapted to be electrically connected to an IC chip; a first interlaminar resin insulating layer disposed between the IC chip side surface and the first plurality of conductor circuits; a second interlaminar resin insulating layer disposed between the other surface and the second plurality of conductor circuits; a first plurality of soldering pads formed on the IC chip side surface; a second plurality of soldering pads formed on the other surface, the soldering pads of the second plurality being larger than the soldering pads of the first plurality; and a dummy pattern constructed and adapted to improve the mechanical strength of the package board, the dummy pattern being formed at an outer periphery of the first plurality of conductor circuits.