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:
Apr. 24, 2018
Filed:
Dec. 21, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Hirofumi Abe, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
Provided is a zoom lens, comprising, in order from object side to image side: first positive, second negative and third positive lens units and a rear lens group including at least one lens unit, in which: at telephoto end as compared to wide angle end, an interval between first and second lens units is increased, and an interval between second and third lens units is reduced; an interval between adjacent lens units is changed during zooming; the first lens unit consists, in order from object side to image side, of a first positive lens sub-unit, and a second negative lens sub-unit over a widest air interval; and a focal length ft of zoom lens at telephoto end, a focal length fof first lens sub-unit, a lateral magnification βof second lens sub-unit, and a lateral magnification βof second lens unit at telephoto end are appropriately set.