Wide field of view projection lenses for compact projection...

Details Wide field of view projection lenses for compact projection... Wide field of view projection lenses for compact projection...

2007-11-06

2007-11-06

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S716000, C359S717000, C359S649000, C359S722000, C359S723000, C359S691000, C353S100000, C353S101000, C353S122000

Reissue Patent

active

10720004

ABSTRACT:
A projection lens for use with LCD panels is provided. The lens has a first lens unit which includes a strong negative lens element having an aspherical surface which provides distortion correction, and a second lens unit which includes a first lens subunit separated by an airspace from a second lens subunit, wherein the first lens subunit has a strong positive power and the second lens subunit has a weaker power. The second lens subunit can include a negative lens element, followed by a positive lens element, followed by a plastic lens element having an aspherical surface. The projection lens has a field of view of at least 35° so that the overall projection lens system has a compact size.

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