Patent ID: 8305559

Claim:
An exposure apparatus for transferring a first mask pattern from a first mask and a second mask pattern from a second mask to a substrate, the substrate including a first site and a second site that are aligned along a scan axis, the exposure apparatus comprising: a first mask stage assembly that positions the first mask; a second mask stage assembly that positions the second mask; an illumination system that selectively generates a first illumination beam that is directed at the first mask to generate a first pattern beam, and a second illumination beam that is directed at the second mask to generate a second pattern beam; a substrate stage assembly that positions the substrate; and an optical assembly that directs the first pattern beam and the second pattern beam at the substrate, the optical assembly having a field of view that defines a first used field having a first field dimension that is at least approximately thirty-three millimeters, and the optical assembly having a numerical aperture of at least approximately 1.30.