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:
Sep. 08, 1998
Filed:
Mar. 13, 1997
Applicant:
Inventor:
Kiyoshi Hayashi, Tokyo, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
359686 ; 359708 ;
Abstract
A large aperture wide angle zoom lens system including four groups of lenses. The four lens groups, viewed from the object side, include a first group with negative refractive power, a second group with positive refractive power, a third group with negative refractive power, and a fourth group with positive refractive power. The zoom lens system is capable of maintaining the position of the image constant during zooming, has fine imaging performance despite a large zoom ratio of 2.times. and a speed which is as fast as F/2.8 with an angle of view of 84.degree. on the wide side.