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 |
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.
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