Patent ID: 7785755

Claim:
An exposure method comprising: forming a plurality of test resist patterns by scanning and projecting an image of a mask pattern onto a first resist layer with a plurality of test values of doses; defining a plurality of coordinates of mask positions along the mask pattern in a scan direction; measuring a plurality of actual values of mask line widths of the mask pattern at the plurality of coordinates, respectively; measuring a plurality of actual values of resist line widths at a plurality of projected positions for each of the test resist patterns, the plurality of projected positions corresponding to the plurality of mask positions in the scan direction, respectively; collecting a relationship between the actual values of the resist line widths and the test values of the doses at each of the plurality of coordinates of the mask positions; calculating a target value of dose to form a designed value of the resist line width by each of the mask line widths at each of the plurality of coordinates of the mask positions, using the relationship; and scanning and projecting the image of the mask pattern onto a second resist layer using the target value of the dose at each of the plurality of coordinates of the mask positions, to make the resist line width constant in the scan direction.