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:
Oct. 28, 2014
Filed:
Nov. 14, 2011
Junya Ichimura, Utsunomiya, JP;
Junya Ichimura, Utsunomiya, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A zoom lens and optical apparatus includes, in order from a magnification conjugate side, a first lens unit that has a positive refractive power and is fixed during magnification variations, and a magnification-variable unit configured to move for magnification variations. The first lens unit includes, in order from the magnification conjugate side, a first lens sub-unit that has a positive refractive power and is configured to move during focusing, and a second lens sub-unit that has a positive refractive power and moves during focusing. The first lens sub-unit and the second lens sub-unit move and reduce an interval between the first lens sub-unit and the second lens sub-unit for focusing from infinity to a close end. A surface of the second lens sub-unit closest to the magnification conjugate side has a concave shape on the magnification conjugate side.