Projection optical system

Details Projection optical system Projection optical system

2011-06-07

2011-06-07

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S781000, C359S717000

Reexamination Certificate

active

07957069

ABSTRACT:
A projection optical system comprises a plurality of lenses disposed along an optical axis of the projection optical system; wherein the plurality of lenses is dividable into four non-overlapping groups of lenses, such that a total refractive power of each group of lenses is one of a negative refractive power and a positive refractive power; and wherein a refractive power of each lens of the fourth group of lenses is equal to or greater than 0. A lens of the third group of lenses which is disposed directly adjacent to a lens of the fourth group of lenses may have a concave surface facing towards the second object.

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