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. 08, 2022
Filed:
Jul. 14, 2020
Canon Kabushiki Kaisha, Tokyo, JP;
Yuki Shinzato, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An optical system includes, in order from an object side to an image side, a first lens unit fixed during focusing, a second lens unit having a positive refractive power, configured to move during focusing, a third lens unit having a negative refractive power, configured to move during focusing, and a fourth lens unit fixed during focusing. During focusing from infinity to a short distance end, the second lens unit and the third lens unit move to the object side while a distance between the second lens unit and the third lens unit changes. A predetermined condition is satisfied.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile