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. 22, 2026
Filed:
Sep. 30, 2024
Applicant:
Sigma Corporation, Kanagawa, JP;
Inventors:
Ken Asakura, Kanagawa, JP;
Noriyuki Ogasawara, Tokyo, JP;
Assignee:
SIGMA CORPORATION, Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01); G02B 13/00 (2006.01); G02B 13/02 (2006.01);
U.S. Cl.
CPC ...
G02B 13/02 (2013.01); G02B 13/0045 (2013.01); G02B 13/006 (2013.01);
Abstract
It is aimed at providing an imaging optical system which is small-sized and lightweight, has a small-sized and lightweight focusing unit, and is therefore appropriate for a small-sized and lightweight telephoto lens. An imaging optical system of the present invention includes, in order from an object side toward an image side, a first lens group Ghaving a positive power as a whole, a second lens group Gincluding a lens that moves on an optical axis during focusing, and a third lens group Ghaving a power, and satisfies predetermined conditional expressions.