The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 24, 1998
Filed:
Apr. 29, 1996
Mark M Meyers, Hamlin, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A wide angle zoom lens suitable for use in cameras for providing sufficiently wide range of field angles to cover a frame of a film in the camera provides performance comparable to zoom lenses having more elements. The wide angle zoom lens has four elements in three groups which are moveable with respect to each other. The front group has a diffractive lens formed on a curved surface thereof. The second or intermediate group and the front group has surfaces are aspheres for aberration correction as does a surface of a single element third group. Chromatic aberration is corrected by the diffractive lens in combination with the lens of the other groups over the zoom range. The third group lens is formed with glass with lower dispersion (higher Abbe number) than the lenses of the other groups. The second group has two lenses one of which may be a low power, negative, meniscus lens which is made of plastic thereby further reducing the cost of the zoom lens.