Long focal length projection lenses

Details Long focal length projection lenses Long focal length projection lenses

1997-05-16

1999-10-19

Epps, Georgia

Optical: systems and elements

Lens

With field curvature shaping

359649, 359689, 359716, 359784, 359791, G02B 300, G02B 1514, G02B 912

Patent

active

059698748

ABSTRACT:
A projection lens for use with LCD or DMD panels is provided. The lens has three lens units, the first unit having a weak power, at least one aspheric surface, a high dispersion negative lens element, and a low dispersion positive lens element, the second lens unit having a positive power, and the third lens unit having a negative power and an overall meniscus shape. The projection lens satisfies the following relationships:

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The Handbook of Plastic Optics, U.S. Precision Lens, Inc., Cincinnati, Ohio, 1983, pp. 17-29.

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