Aperture and projection lens system

Details Aperture and projection lens system Aperture and projection lens system

2008-01-22

2008-01-22

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With light limiting or controlling means

C359S649000, C359S722000, C359S741000

Reexamination Certificate

active

07321473

ABSTRACT:
An aperture comprising a round filter portion and at least one annular filter portion is provided. The round filter portion and the annular filter portion are forming a round zone. A transmission wavelength range of the round filter portion is larger than a transmission wavelength range of the annular filter portion. A projection lens system with the aperture can produce images having higher brightness of the images and better image quality.

REFERENCES:
patent: 7008065 (2006-03-01), English et al.
patent: 7042658 (2006-05-01), Chen et al.
patent: 2005/0275956 (2005-12-01), Larson et al.
patent: 2007/0035852 (2007-02-01), Farr

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