Projection lens system and projector

Details Projection lens system and projector Projection lens system and projector

2007-02-27

2007-02-27

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S649000, C359S680000, C359S691000

Reexamination Certificate

active

11348076

ABSTRACT:
A projection lens system that is suited to a compact, wide-angle lens system. The projection lens system projects projection light from a light modulator onto a screen, wherein the projection lens system is constructed, in order from a screen side thereof, of a first lens group with negative refractive power and a second lens group with positive refractive power and is non-telecentric on an incident side thereof, and the second lens group includes a pair of cemented doublet lenses with positive refractive power whose cemented surfaces face in opposite directions and a cemented triplet lens with positive refractive power.

REFERENCES:
patent: 2660094 (1953-11-01), Wreathall
patent: 6317269 (2001-11-01), Yamamoto
patent: 6471359 (2002-10-01), Kim et al.
patent: 2000-338448 (2000-12-01), None

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