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:
May. 21, 2019
Filed:
Oct. 19, 2016
Canon Kabushiki Kaisha, Tokyo, JP;
Nobuyuki Miyazawa, Utsunomiya, JP;
Tomoyuki Nakamura, Utsunomiya, JP;
Naotoshi Ogawa, Utsunomiya, JP;
Kazuya Shimomura, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A zoom lens, includes, in order from object side: a front unit including a unit including a first unit arranged closest to the object side and not moving for zooming; an Nf unit including three or more lenses and having a negative refractive power; an stop; a first rear unit moving during zooming; a second rear unit moving during zooming; and a third rear unit not moving for zooming, in which: the front unit includes four or more lenses and includes one or more units having a positive refractive power; and a difference between positions of the first rear unit at a wide angle end and a telephoto end, a difference between positions of the second rear unit at the wide angle end and the telephoto end, a focal length of the second rear unit, and a focal length of the zoom at the wide angle end are appropriately set.