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. 10, 1992
Filed:
Nov. 26, 1990
Juro Kikuchi, Tokyo, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A zoom lens system permitting photographing at definite magnification levels comprising a first lens unit and a second lens unit, and equipped with a first mechanism for varying f and .beta. so as to keep f/.beta. nearly constant and a second mechanism for varying, independently of the first mechanism, the airspace between the first lens unit and the second lens unit when the reference symbol f represents total focal length of the first lens unit and the reference symbol .beta. designates total lateral magnification of the second lens unit. Said zoom lens system is equipped with simple mechanisms and permits photographing objects located at distances within a broad range at optional magnification levels within a certain range.