Optical: systems and elements – Lens – Multiple component lenses
Patent
1997-10-06
1998-11-03
Sugarman, Scott J.
Optical: systems and elements
Lens
Multiple component lenses
359663, G02B 964, G02B 1322
Patent
active
058317767
ABSTRACT:
A projection optical system that projects an image of an object in an object surface onto an image surface with a fixed reduction magnification comprises, in light path order from the object surface: a first group of lenses with positive refractive power; a second group of lenses forming an approximately afocal system; and a third group of lenses with positive refractive power. The projection optical system has a focal length F, the projection optical system has a projection magnification B, the object surface and the image surface are separated by a distance L, and a lens surface in the first group of lenses that is closest to the object surface is separated from the object surface by a distance d.sub.0. A paraxial marginal ray from an axial object point on the object surface enters the second group of lenses G.sub.2 at an entrance height h.sub.1 from an optical axis, and the paraxial marginal ray from the axial object point on the object surface emerges from the second group of lenses G.sub.2 at an emergence height h.sub.2 from the optical axis. The optical system is characterized by the following:
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Mercado Romeo I.
Sasaya Toshihiro
Suenaga Yutaka
Ushida Kazuo
Nikon Corporation
Sugarman Scott J.
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