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:
Jan. 22, 2013
Filed:
May. 25, 2011
Masakazu Kodaira, Utsunomiya, JP;
Masakazu Kodaira, Utsunomiya, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A zoom lens, including: a front lens group; an aperture stop; and a rear lens group, in which the rear lens group includes: a front lens unit and a rear lens unit, a maximum air interval of the rear lens group being interposed between the front lens unit and the rear lens unit, in which the rear lens unit includes: a first lens which is located on the most object side; a second lens which is located on the most image side, and the following conditional expressions are satisfied: −6.0≦fs/frr≦−1.0; and −9.0≦fs/frr≦−2.0, where frr indicates a focal length of the rear lens unit, and fsand fsindicate a focal length of the first lens and a focal length of the second lens, respectively.