Patent ID: 7800913
Filing Date: 2010-09-21
Classification: H01L,H05K

Abstract:
1. A wiring board, comprising: a flexible insulating base; a plurality of conductive wirings arranged on the insulating base, end portions of the conductive wirings defining inner leads at a chip mounting region where a semiconductor chip is to be mounted; and bump electrodes that are provided respectively at the inner leads of the conductive wirings, wherein the inner leads are arranged so as to form a sparsely arranged region and a densely arranged region along at least one side of the chip mounting region and have a first shape and pitch in the densely arranged region, and the wiring board further comprises: dummy inner leads provided in the sparsely arranged region and having the first shape and pitch of the inner leads and aligned with the inner leads, the dummy inner leads being provided with dummy bump electrodes corresponding to the bump electrodes; branch wirings connected respectively to an adjacent plurality of the dummy inner leads; and a trunk conductive wiring connected to a group of the adjacent plurality of the dummy inner leads via the branch wirings.