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US 2006/0221475 A1Published application
Aperture and projection lens system
AssigneeCoretronic Corporation
InventorChin-Ku Liu
Life of this patent
Estimating the term…
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.
Claims14
An aperture, comprising:
- a round filter portion;
- and
- at least one annular filter portion,
- wherein the round filter portion and the annular filter portion form a round zone and a transmission wavelength range of the round filter portion is larger than a transmission wavelength range of the annular filter portion.
1 more element
A projection lens system, comprising:
- a lens;
- and
- an aperture, disposed in front of the lens, the aperture comprising a round filter portion and at least one annular filter portion, the round filter portion and the annular filter portion forming a round zone and a transmission wavelength range of the round filter portion being larger than a transmission wavelength range of the annular filter portion.
Dependencies are inferred from the claim text.