Patent ID: 6416908
Filing Date: 2002-07-09
Classification: G03F

Abstract:
A projection lithography system for imaging a microelectronics pattern onto a curved substrate with provisions for keeping the track length unchanged, thereby maintaining the substrate surface within the depth of focus of the projection optics, while using overlapping complementary seamless scanning techniques, characterized by:a) a curved substrate (11); b) a curved mask (12), having a well-defined size and shape relationship with respect to said curved substrate (11); c) radiation means (14): d) projection means (13); e) scanning means (15), to present, for scanning, both said curved mask (12) and said curved substrate (11) for imaging by patterned radiation to transfer a pattern image from mask (12) to substrate (11) via said projection means (13); whereby the curved mask pattern is imaged onto the curved substrate surface, and the substrate surface remains within the depth-of-focus of said projection means.