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:
Jul. 01, 2014
Filed:
May. 24, 2012
Kazuya Shimomura, Utsunomiya, JP;
Fumiaki Usui, Utsunomiya, JP;
Kazuya Shimomura, Utsunomiya, JP;
Fumiaki Usui, Utsunomiya, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A zoom lens including, in order from object side: a positive first unit fixed for zooming; a negative second unit moving for zooming; a zoom unit including at least one unit moving for zooming; a stop; and a fixed unit. The first unit includes a negative first sub-unit not moving for focusing, and a positive second sub-unit and a positive third sub-unit moving toward image side and object side, respectively, when focusing from infinity object to proximity object. A focal lengths of the first and second units, a distance from a vertex of a surface closest to the image side in the first unit to an image side principal point position of the first unit, a thickness of the first unit on an optical axis, and lateral magnifications of the second and third sub-units when focusing on infinity object are appropriately set.