Patent ID: 7230705
Filing Date: 2007-06-12
Classification: G03F,H01L

Abstract:
1. An alignment target for determining the alignment between a first element and a second element, said alignment target comprising: a first location comprising: a second location comprising: a third location comprising: wherein said fifth periodic pattern and said sixth periodic pattern have the same pitch and said sixth periodic pattern has a designed in offset with a third magnitude in a third direction with said fifth periodic pattern such that when said first element and said second element are properly aligned said fifth periodic pattern and said sixth periodic pattern overlap and will be offset by said third magnitude in a third direction; wherein said first periodic pattern and said third periodic pattern have a pitch and said first magnitude and said second magnitude are approximately 25% of said pitch; and wherein said third magnitude is equal to said first magnitude plus the magnitude of a reference offset, wherein said magnitude of said reference offset is between approximately 1% to 10% of the pitch of said fifth periodic pattern, and wherein said third direction is equal to said first direction.