Patent ID: 8760627

Claim:
A lithographic apparatus which irradiates a photosensitive material coated on a substrate with light via an original by an irradiation system to transfer a pattern of the original onto a shot region on the substrate, the apparatus comprising: a light-shielding plate which includes, on an edge thereof, an arc overlapping with a circular boundary line that defines a region, onto which the pattern is transferred, on the substrate and is located inside an outer periphery of the substrate at a predetermined distance therefrom, and blocks the light to prevent the light from being incident on an outer peripheral region located outside the circular boundary line on the substrate; a first driving unit which rotates said light-shielding plate about an axis parallel to an optical axis of the irradiation system; a second driving unit which linearly drives said light-shielding plate in a direction determined depending on rotation of said light-shielding plate within a plane perpendicular to the optical axis of the irradiation system; and a controller which controls said first driving unit and said second driving unit so that said light-shielding plate is positioned at a position, at which said light-shielding plate covers the outer peripheral region which is in contact with a shot region onto which the pattern is to be transferred, when the shot region is in contact with the outer peripheral region, wherein the arc includes a first arc and a second arc which are located on edges of the light-shielding plate, wherein the minimum width, in the direction in which said second driving unit linearly drives said light-shielding plate, of said light-shielding plate is longer than a length of a diagonal line of the shot region, and wherein said controller controls said first driving unit and said second driving unit so as to use one of the first arc and the second arc in accordance with a position of the shot region which is in contact with the outer peripheral region.