Patent ID: 6906423
Filing Date: 2005-06-14
Classification: G03F,H05K,Y10T

Abstract:
1. A mask used for exposing a porous substrate to form a first region and a second region, said first region being filled with a conductive material piercing through the entire thickness of the porous substrate to constitute an interfacial conductive portion, said second region being filled with a conductive material not piercing the entire thickness of the porous substrate to constitute a non-interfacial conductive portion, said mask comprising: a first light-transmitting region for exposing said first region, and a second light-transmitting region for exposing said second region, said second light-transmitting region including an aggregation of fine patterns of which an average aperture ratio is not more than 50% of an average aperture ratio of said first light-transmitting region and a size of said fine patterns of said second light-transmitting region being in a range of 0.1 μm to 10 μm.