Patent ID: 9581910
Date: 2017-02-28
CPC Classifications: G03F

Claim:
1. A method of using a mask comprising a first mask pattern area and a second mask pattern area which is different from the first mask pattern area, the method comprising: a) directing projection light having a first angular distribution onto the first mask pattern area to produce a first exposed pattern area on a surface of a light sensitive material and directing projection light having a second angular distribution onto the second mask pattern area to produce a second exposed pattern area on the surface of the light sensitive material; and b) after a), directing projection light having the first angular distribution through the first mask pattern and on the second exposed pattern area, and simultaneously directing projection light having the second angular distribution through the second mask pattern and on a third exposed pattern area which is different from the first and second exposed pattern areas, and wherein the first angular distribution is different from the second angular distribution.