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. 05, 2002
Filed:
Aug. 24, 2000
Kimiaki Nakazawa, Saitama, JP;
Fuji Photo Optical Co., Ltd., Omiya City, JP;
Abstract
A wide-angle lens is disclosed having only three lens groups of negative, positive, and positive refractive power, in order from the object side, and having only six lens elements with refractive power. The first lens group is formed of a meniscus lens with its convex surface on the object side, the second lens group is formed of a biconvex lens, and the third lens group is formed of, in order from the object side, a biconcave lens element, a positive lens element having a convex surface on the image side, a positive lens element having a convex surface on the image side, and a positive lens element having a convex surface on the object side. A diaphragm is arranged between the second lens group and the third lens group. Furthermore, specified conditions are satisfied in order to provide a compact wide-angle lens that is well corrected for aberrations and has a sufficient back focal length to insert additional optical components.