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:
Jul. 20, 1993
Filed:
Oct. 02, 1991
Kiyoshi Hayashi, Tokyo, JP;
Atsushi Shibayama, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A zoom lens comprises a first lens group having the positive refractivity which relatively travels along the optical axis to change the distance between the groups for varying powers, and a second lens group having negative refractivity. The first lens group has sequentially from an object side a first positive lens component, a second negative lens component, a third lens component having positive refractivity, a fourth positive lens component, and fifth lens component having positive refractivity, and the second lens group has sequentially from the object side a sixth positive lens component, a seventh negative lens component, and an eighth negative lens component. Further, the first lens group includes a diaphragm adjacent to the fifth lens component, and the zoom lens is characterized in being structured to satisfy conditions given below.