Patent ID: 6774983
Filing Date: 2004-08-10
Classification: G03F

Abstract:
A distributed projection system for a mask projection patterning system in which a unitary stage carries both mask and substrate, mounted for simultaneous scanning motions, in which the projection system is substantially 1:1 with a reverser,characterized in that: a) the projection system is of finite length and is twice folded with mask part-lens section, with crossover section with aperture stop, and with substrate part-lens section; b) said crossover section is in two part-sections, the reverser part-section and the natural part-section, with an intermediate aperture stop position, the reverser part-section having additional optical path length inherent in said reverser; and c) said aperture stop position is positioned to balance the optical path lengths of the reverser half-section and the natural half-section.