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. 10, 2016
Filed:
Aug. 27, 2014
Canon Kabushiki Kaisha, Tokyo, JP;
Toyokatsu Fujisaki, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, a fourth lens unit having negative refractive power, and a fifth lens unit having positive refractive power. At least the first, second, and third lens units move during zooming so that the first lens unit is located closer to an object side than an image side, the second lens unit is located closer to the image side, and the third lens unit is located closer to the object side at a telephoto end than a wide-angle end. Movement, focal length, and positioning parameters of first to third lens units, during zooming from the wide-angle end toward the telephoto end, are appropriately set based on mathematical conditions.