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:
May. 03, 1994
Filed:
Feb. 01, 1993
Masahiro Nakatsuji, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A great relative aperture telephoto zoom lens of four-unit construction has, in succession from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power. The fourth lens unit has, in succession from the object side, a front group having positive refractive power and a rear group having positive refractive power. The front group has, in succession from the object side, two positive lens components and a negative lens component. The rear group has, in succession from the object side, a positive lens component and a negative lens component, and is designed to satisfy predetermined conditions.