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. 29, 2021
Filed:
Nov. 16, 2018
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventors:
Shinichiro Saito, Utsunomiya, JP;
Makoto Nakahara, Utsunomiya, JP;
Suguru Inoue, Utsunomiya, JP;
Akira Mizuma, Utsunomiya, JP;
Masakazu Yamagishi, Saitama, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 13/02 (2006.01); G03B 5/00 (2006.01); G02B 7/08 (2006.01); G02B 15/15 (2006.01); G02B 9/12 (2006.01); G02B 7/04 (2006.01); G02B 27/64 (2006.01);
U.S. Cl.
CPC ...
G02B 13/02 (2013.01); G02B 7/04 (2013.01); G02B 7/08 (2013.01); G02B 9/12 (2013.01); G02B 27/646 (2013.01); G03B 5/00 (2013.01);
Abstract
An optical system is constituted of a first lens unit having a positive refractive power, a second lens unit having a positive refractive power and moving when focusing is performed, and a third lens unit which are arranged in this order from an object side to an image side, and distances between neighboring lens units are changed when focusing is performed. In the optical system, a back focus, arrangement of the second lens unit, and the like are appropriately set.