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:
Aug. 04, 1992
Filed:
Apr. 15, 1991
Yoshinari Hamanishi, Wako, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An inner focusing type telephoto zoom lens includes a fixed first lens group having a positive refractive power, the first lens group being disposed closest to the object, a second lens group having a negative refractive power, the second lens group being movable along an optical axis for focusing, a fixed third lens group having a positive refractive power, a fourth lens group having a negative refractive power, the fourth lens group being movable along the optical axis for zooming, a fifth lens group having a positive refractive power, the fifth lens group being movable along the optical axis relative to the fourth lens group, and a fixed sixth lens group having a positive refractive power. The zoom lens satisfies the following condition: