Patent ID: 8089775
Filing Date: 2012-01-03
Classification: H01L,H05K,Y02P

Abstract:
1. An interposer for a multileveled printed circuit board unit in which conductive bumps are stacked between a printed wiring substrate and a mounted component, the interposer comprising: an interposer substrate interposed between stacked conductive bumps, the interposer substrate having conductive electrode pads arranged on both sides of the interposer substrate to have the conductive electrode pads contacted with the conductive bumps, respectively, the interposer substrate defining slits each penetrating through the interposer substrate from one side to other side, the slits respectively located between adjacent ones of the conductive electrode pads on the one side and on the other side, wherein size of the slits at a central area of the interposer substrate is set smaller than that of the slits located at an area remoter from the central area.