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:
Nov. 15, 2022
Filed:
Apr. 02, 2020
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Shinya Okuoka, Utsunomiya, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 9/34 (2006.01);
U.S. Cl.
CPC ...
G02B 9/34 (2013.01);
Abstract
An optical system includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an intermediate unit including one or more lens units, and a final lens unit having a negative refractive power. The second lens unit is moved toward an image plane, and a lens unit closest to the image plane in the one or more lens units included in the intermediate unit is moved toward the object in focusing from infinity to a short distance. The second lens unit satisfies a predetermined inequality.