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. 22, 2021
Filed:
Nov. 01, 2018
Canon Kabushiki Kaisha, Tokyo, JP;
Shinichiro Saito, Utsunomiya, JP;
Makoto Nakahara, Utsunomiya, JP;
Suguru Inoue, Utsunomiya, JP;
Akira Mizuma, Utsunomiya, JP;
Masakazu Yamagishi, Saitama, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An optical system includes a first lens unit Bhaving a positive refractive power, a second lens unit B, and a third lens unit Bdisposed in order from an object side to an image side. The second lens unit Bmoves in focusing so that an interval between adjacent lens units among the first, second, and third lens units changes. The first lens unit Bincludes a positive lens Gdisposed closest to the object side and a negative lens Gbeing a closest negative lens with respect to the object side. The optical system satisfies a predetermined condition.