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:
Feb. 25, 2025
Filed:
Jan. 21, 2021
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Toyokatsu Fujisaki, Tochigi, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01); G02B 15/20 (2006.01); G02B 27/00 (2006.01);
U.S. Cl.
CPC ...
G02B 15/143107 (2019.08); G02B 15/20 (2013.01); G02B 27/0025 (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 positive refractive power, and a third lens unit having a positive refractive power. During focusing from infinity to a short distance, the first lens unit is fixed, and the second lens unit and the third lens unit are moved so that a distance between the second lens unit and the third lens unit changes. Predetermined conditions are satisfied.