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. 02, 2021
Filed:
Oct. 10, 2018
Canon Kabushiki Kaisha, Tokyo, JP;
Masakazu Kodaira, Utsunomiya, JP;
Masaru Sakamoto, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A zoom lens including, in order from an object side, a positive first unit configured not to be moved for zooming, a negative second unit configured to be moved for zooming, a positive third unit configured to be moved for zooming, a zooming lens group including a lens unit and configured to be moved for zooming, and a positive unit configured not to be moved for zooming, wherein the third unit includes positive and negative lenses, the second and third units move to an image side for zooming from a wide-angle end to a telephoto end, and focal lengths at the wide-angle end and the telephoto end, a zoom ratio, a space between the second unit third units and is maximum in a zoom range from the telephoto end to a predetermined focal length, and a space between the second third units at the telephoto end are properly set.