Projection lens system

Details Projection lens system Projection lens system

2008-09-18

2010-02-02

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S781000, C359S686000

Reexamination Certificate

active

07656587

ABSTRACT:
An exemplary projection lens system includes, in order from the magnification side to the reduction side thereof, a first lens with negative refraction power, a second lens with positive refraction power, a third lens with negative refraction power, and a fourth lens with positive refraction power. The projection lens system satisfies the formulae 3.7<TT/f<4; and BFL/f>1.41; where TT is a total length of the projection lens, f is an effective focal length of the projection lens system and BFL is a back focal length of the projection lens system.

REFERENCES:
patent: 2849918 (1958-09-01), Eismann et al.
patent: 6236521 (2001-05-01), Nanba

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