Projection lens system and projector

Details Projection lens system and projector Projection lens system and projector

2006-06-06

2006-06-06

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C359S716000, C359S753000, C359S784000

Reexamination Certificate

active

07057825

ABSTRACT:
A projection lens system that projects projected light from a light modulator to a screen, comprising in order from a screen side: a first lens group with a negative refractive power; a second lens group with a positive refractive power; and a third lens group with a positive refractive power is provided. The third lens group includes at least two cemented lenses and a lens with a positive refractive power positioned on an opposite side of the cemented lenses to the screen. Since the projection lens system achieves a sufficiently high correcting performance for various aberrations using fewer aspherical lenses, it is suitable lens system for a rear projector with high image quality.

REFERENCES:
patent: 5625495 (1997-04-01), Moskovich
patent: 5841587 (1998-11-01), Moskovich
patent: 5900987 (1999-05-01), Kreitzer
patent: 6317269 (2001-11-01), Yamamoto
patent: 6587279 (2003-07-01), Narimatsu et al.
patent: 2002/0018301 (2002-02-01), Narimatsu et al.
patent: 2002-031754 (2002-01-01), None

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