Patent ID: 7436491
Filing Date: 2008-10-14
Classification: G03F

Abstract:
1. An exposure system comprising: an illumination optical system configured to define, in an effective illumination source plane, a center region forming a perpendicularly incident light having an optical axis perpendicular to a plane of a mask pattern and first and second eccentric regions being opposite to each other with regard to the center region in the effective illumination source plane, each of the first and second eccentric regions forming an obliquely incident light having an optical axis oblique to the plane of the mask pattern and having a perpendicular electric vector component perpendicular to a straight line connecting the first and second eccentric regions in the effective illumination source plane, the electric vector component being larger than a parallel electric vector component parallel to the straight line, and to illuminate the mask pattern with the perpendicularly incident light and the obliquely incident lights; and a projection optical system configured to project an image of the mask pattern to a processing object with the perpendicularly incident light and the obliquely incident lights.