US 7,321,473 B2
Aperture and projection lens system
Chin-Ku Liu, Miao-Li County (Taiwan)
Assigned to Coretronic Corporation, Miao-Li County (Taiwan)
Filed on Nov. 08, 2005, as Appl. No. 11/164,023.
Claims priority of application No. 94110687 A (TW), filed on Apr. 04, 2005.
Prior Publication US 2006/0221475 A1, Oct. 05, 2006
Int. Cl. G02B 9/08 (2006.01)
U.S. Cl. 359—738  [359/649; 359/722; 359/741] 8 Claims
OG exemplary drawing
 
1. An aperture, comprising:
a round filter portion, a transmission wavelength range of the round filter portion being equal to a combined wavelength range of a red light, a green light and a blue light; and
a plurality of annular filter portions, comprising a first annular filter portion and a second annular filter portion, the first annular filter portion being located between the round filter portion and the second annular filter portion, a transmission wavelength range of the first annular filter portion being equal to a combined wavelength range of the red light and the green light, a transmission wavelength range of the second annular filter portion being equal to the wavelength range of the red light, the transmission wavelength range of the first annular filter portion being larger than the transmission wavelength range of the second annular filter portion,
wherein the round filter portion and the annular filter portions form a round zone and the transmission wavelength range of the round filter portion is larger than the transmission wavelength range of the first annular filter portion and the second annular filter portion.