Patent ID: 6815659
Filing Date: 2004-11-09
Classification: G02B

Abstract:
An optical system, comprising:an optical sensor having an array of light receptors having a pixel pitch; and a lens optically associated with the optical sensor along an optical path, the lens having a diffraction limited spot size and configured with optical parameters functionally related to the pixel pitch and a desired resolution of the optical system, such that the lens is operative to substantially map a portion of the diffraction limited spot size to an associated one of the light receptors, the lens comprising a numerical aperture to be functionally related to a ratio of a wavelength of light employed to illuminate an object and the desired resolution, the numerical aperture (NA) being computed according to the expression: NA =(0.5Ã—&lgr;)/y, where &lgr; is the wavelength of light and y is the pixel pitch.