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:
Aug. 16, 2016
Filed:
Feb. 10, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Masaru Sakamoto, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A zoom lens comprising, in order from the object side to the image side, a first lens unit having a positive refractive power which does not move for zooming, a plurality of lens units which move during zooming, and a rear lens unit having a positive refractive power which does not move for zooming, wherein the refractive index, the Abbe constant, the partial dispersion ratio and the focal length of the positive lens located closest to the image side among the positive lenses in the first lens unit and the focal length of the first lens unit, the focal length of the positive lens located closest to the image side among the positive lenses in the first lens unit, and the focal length of the first lens unit are appropriately set.