US Patent 7321473 Aperture and projection lens system

Patent 7321473 was granted and assigned to Coretronic on January, 2008 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Coretronic

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7321473

Date of Patent

January 22, 2008

Patent Application Number

11164023

Date Filed

November 8, 2005

Patent Primary Examiner

‌

Jordan M. Schwartz

Patent 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.