Patent ID: 7094677

Claim:
A method of forming a penetration electrode, comprising: providing an electroconductive film on a first surface of a substrate, said substrate including a first insulating layer disposed on the first surface and a second insulating layer disposed on a second surface opposite the first surface, in at least a portion of the substrate where the penetration electrode is being formed; forming a micropore to penetrate through said substrate from the second surface of said substrate to the electroconductive film on the first surface of the substrate; forming an insulating layer on inside walls of said micropore; bonding a protecting member to the electroconductive layer on the first surface of said substrate; inserting an electroconductive substance into said micropore, said electroconductive substance and said electroconductive film providing a conductive path through said substrate; and removing said protective member from the electroconductive film on the first surface of said substrate in an area corresponding to the micropore; wherein said electroconductive film blocks off a first aperture of said micropore at said first surface of the substrate, and wherein said electroconductive substance is inserted into said micropore via an aperture of said micropore at said second surface of said substrate.