Patent ID: 7906733
Filing Date: 2011-03-15
Classification: H01L,H05K,Y02P

Abstract:
1. An electronic circuit device comprising: a stack structure in which a plurality of electronic circuit boards are stacked in three or more layers through ball electrodes bonded to electrode pads on the electronic circuit boards, wherein the electrode pads are disposed such that transmission shaded images of a pair of the electrode pads respectively provided in first and second layers partially overlap each other and have a non-overlapping region in which the transmission shaded images of the pair of the electrode pads are free from overlapping, and such that the transmission shaded images of the non-overlapping region are at least partially free from overlapping with transmission shaded images of all other ones of the electrode pads, and wherein an upper ball electrode and a lower ball electrode are respectively attached to the pair of the electrode pads in the first and second layers, with the upper and lower ball electrodes being arranged in an overlapping manner.