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. 28, 1995
Filed:
Mar. 14, 1994
Applicant:
Inventor:
Wataru Tatsuno, Yokohama, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359747 ; 359685 ; 359686 ; 359745 ; 359779 ;
Abstract
A micro lens allowing a short-distance photographing operation from infinity to an equal magnification consists of, in order from the object side, a first lens group including a negative lens and having a positive refracting power, a second lens group having a positive refracting power, a third lens group including a cemented lens (doublet lens) and having a negative refracting power, and a fourth lens group having a positive refracting power. When a focusing operation is performed from infinity to a short distance, the first lens group is nonlinearly moved and the group interval between the second and third lens groups is increased, thereby satisfying required conditions.