Retrofocus projection lens system and multivision projection dis

Details Retrofocus projection lens system and multivision projection dis Retrofocus projection lens system and multivision projection dis

1997-10-08

1999-10-26

Epps, Georgia

Optical: systems and elements

Lens

With field curvature shaping

359663, 359716, 359726, 359753, G02B 300, G02B 1322, G02B 1304

Patent

active

059738480

ABSTRACT:
A retrofocus projection lens system comprising, in order from a large conjugate side a first lens group having a negative refracting power and including a plurality of lenses, a second lens group having a positive refracting power, and a third lens group having a positive refracting power and including a plurality of lenses. The lens of the first lens group which is nearest to the large conjugate side is an aspherical lens, and the lens of the third lens group which is nearest to a small conjugate side is an aspherical lens. The retrofocus projection lens system desirable satisfy the following conditional expressions (1) to (3):

REFERENCES:
patent: 4801196 (1989-01-01), Betensky
patent: 5218480 (1993-06-01), Moskovich
patent: 5442484 (1995-08-01), Shikawa
patent: 5745297 (1998-04-01), Kaneko et al.

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