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:
Dec. 17, 1985
Filed:
Dec. 05, 1983
Applicant:
Inventor:
Masaki Imaizumi, Tokyo, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
350454 ; 350450 ;
Abstract
A focusing method for a telephoto lens system comprising a front lens group having positive refractive power, an intermediate lens group having negative refractive power, and a rear lens group having positive refractive power, the focusing method for telephoto lens system being arranged to divide the intermediate lens group into two subunits and to focus the lens system by moving those subunits toward the image side by varying the distance between those subunits, the focusing method thereby enabling to attain focusing with satisfactorily favorable aberrations up to an object at a short distance.