Patent ID: 8228486
Filing Date: 2012-07-24
Classification: G03F

Abstract:
1. An exposing method which illuminates, by illumination light, a mask having apertures arranged in matrix and a latticed light shielding portion, projects the mask on an object to be projected via a projection optical system, and thus forms a dark portion pattern image at a position conjugate in relation to intersections of a lattice of the light shielding portion, wherein if it is assumed that, in regard to a center of a pupil of the projection optical system, an X axis extending toward a row direction of the apertures, a Y axis extending toward a column direction of the apertures, and an orthogonal coordinate system having center coordinates of the pupil of the projection optical system as an origin (0, 0) are used, a numerical aperture of the projection optical system is NA, a wavelength of the illumination light is λ (m), a row-direction pitch of the apertures is Px (m), and a column-direction pitch of the apertures is Py (m), then an available light source shape of the illumination is provided by overlapping regions of a circle X Px, Py, a and b satisfy conditions of