Patent Document ID: 20170108783
Application ID: 15315885
Patent Status: 0

Claim One:
1. An exposure method comprising: transferring a first pattern onto each of a plurality of target portions of a substrate, the first pattern including at least one alignment mark; measuring a plurality of positions of the respective transferred plurality of alignment marks and determining a plurality of alignment mark displacements (dx, dy) for the respective plurality of alignment marks as a difference between a respective predetermined nominal position of the alignment mark and the respective measured position of the alignment mark; fitting a mathematical model to the plurality of alignment mark displacements to obtain a fitted mathematical model, determining a position of the first pattern in each of the plurality of target portions, based on the fitted mathematical model; transferring a second pattern onto each of the plurality of target portions, using the determined position of the first pattern in each of the plurality of target portions, wherein the mathematical model comprises polynomials Z 1 and Z 2 : 
 Z 1= r 2 cos(2θ) Z 2= r 2 sin(2θ) in polar coordinates ( r ,θ) or 
 Z 1= X 2 −y 2 Z 2= xy in Cartesian coordinates ( x,y ).