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:
Jan. 17, 1995
Filed:
Jul. 20, 1993
Applicant:
Inventor:
Yasuo Yonezawa, Yokohama, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359687 ; 359380 ; 359684 ;
Abstract
A zoom lens of a four-group structure comprises the following sequentially from the object side, a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power and a fourth lens group having positive refracting power. When a variable power takes place from the wide angle end to the telescopic end, at least the second lens group is driven along the optical axis relatively so that the distance between-the first lens group and second lens group is increased and at the same time, the fourth lens group is driven toward the image side.