Patent ID: 7498074
Filing Date: 2009-03-03
Classification: C23F,H01L,H05K,Y10T

Abstract:
1. A metal photoetching product comprising: at least one large cavity of minor axis W at least two cavities are included inside at least one of the at least one large cavity, and a smallest hole among the cavities has minor axis of W at least one combination of the large cavity and the smallest hole formed in the large cavity has an etching factor of 2.6 or more, where the etching factor is EF=ED/SE wherein EF represents the etching factor, ED represents an etched depth of a cavity to be evaluated, SE represents a primary side etching which is a half of a difference between a dimension of an opening of the cavity formed by primary etching and a dimension of an opening of a photoresist pattern used for the primary etching, and when there are two primary side etchings as a result of photoetching conducted from both upper and lower surfaces of a metal substrate, SE represents the larger one.