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Miniature hybrid optical imaging lens

United States Patent

5,680,252
October 21, 1997
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A miniature lens system that corrects for imaging and chromatic aberrations, the lens system being fabricated from primarily commercially-available components. A first element at the input to a lens housing is an aperture stop. A second optical element is a refractive element with a diffractive element closely coupled to, or formed a part of, the rear surface of the refractive element. Spaced closely to the diffractive element is a baffle to limit the area of the image, and this is closely followed by a second refractive lens element to provide the final correction. The image, corrected for aberrations exits the last lens element to impinge upon a detector plane were is positioned any desired detector array. The diffractive element is fabricated according to an equation that includes, as variables, the design wavelength, the index of refraction and the radius from an optical axis of the lens system components.
Sitter, Jr.; David N. (Knoxville, TN), Simpson; Marc L. (Knoxville, TN)
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
08/ 409,390
March 23, 1995
This invention was made with Government support under Contract DE-AC05-84OR21400 awarded by the United States Department of Energy to Martin Marietta Energy Systems, Inc., and the U.S. Government has certain rights in this invention.