Long focal length projection lenses for use with large pixelized

Details Long focal length projection lenses for use with large pixelized Long focal length projection lenses for use with large pixelized

1998-01-28

1999-11-23

Epps, Georgia

Optical: systems and elements

Lens

With field curvature shaping

G02B 300

Patent

active

059910895

ABSTRACT:
Projection lens having long focal lengths for use with LCD panels are provided. The lenses have a first lens unit which has a positive power and a second lens unit which has a negative power. The first lens unit contains at least three lens elements organized into two subunits, namely, a positive first lens subunit having a positive lens element and a negative lens element and a positive second lens subunit having a positive lens element. The second lens unit contains at least two lens elements, namely, a positive lens element and a negative lens element. The projection lens preferably employs only five lens elements arranged in a positive, negative, positive, positive, negative configuration.

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