Patent ID: 7572500
Filing Date: 2009-08-11
Classification: H05K,Y10T

Abstract:
1. A circuit-forming board, comprising: a metal foil having a first surface and a second surface opposite to said first surface, said metal foil including a pressure absorption portion having a thickness that changes according to a pressure applied thereto, and a hard portion, said pressure absorption portion being situated at said first surface of said metal foil, and said hard portion being situated at said second surface of said metal foil; a material sheet having a surface situated on said second surface of said metal foil, said surface of said material sheet having a hole formed therein; and a conductive portion provided in said hole; wherein said pressure absorption portion has a first portion located over said conductive portion and a second portion located over said surface of said material sheet at a location not over said conductive portion; and wherein said first portion of said pressure absorption portion is thinner than said second portion of said pressure absorption portion.