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:
Jun. 28, 2022
Filed:
Apr. 03, 2020
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventors:
Tomohiro Ino, Utsunomiya, JP;
Maki Yokoya, Utsunomiya, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 9/26 (2006.01); G02B 7/04 (2021.01);
U.S. Cl.
CPC ...
G02B 9/26 (2013.01); G02B 7/04 (2013.01);
Abstract
An optical system consists of, 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 positive refractive power, a third lens unit having a negative refractive power. A distance between adjacent lens units changes during focusing. The second lens unit moves during the focusing. The following conditional expression is satisfied:−0.20<3/<−0.05where f is a focal length of the optical system focused on an object at infinity and f3 is a focal length of the third lens unit.