Patent ID: 7501215
Filing Date: 2009-03-10
Classification: A41D,G03F

Abstract:
1. A device manufacturing method comprising: measuring positions of global alignment marks present on a substrate having a front side and a back side, wherein said global alignment marks are positioned at the back side of said substrate; defining a nominal grid on the front side of said substrate using said measured positions of said global alignment marks; manufacturing a plurality of front side marks on the front side of the substrate; measuring first positions of said respective front side marks with respect to said nominal grid, resulting in original positions of the respective front side marks; executing at least one manufacturing step using original positions of the respective front side marks for alignment; after executing the at least one manufacturing step, measuring second positions of said respective front side marks with respect to said nominal grid, resulting in actual positions of the respective front side marks; calculating measured position changes of said front side marks due to the at least one manufacturing step using said original positions and said actual positions; and storing the measured position changes in a memory and making them available for further use.