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:
Feb. 25, 2014
Filed:
May. 12, 2011
Shoichi Takemoto, Utsunomiya, JP;
Yutaka Iriyama, Utsunomiya, JP;
Shoichi Takemoto, Utsunomiya, JP;
Yutaka Iriyama, Utsunomiya, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A zoom lens includes a first lens unit, a magnification-varying system including at least a second lens unit and a third lens unit, and a fourth lens unit. The fourth lens first unit has a first lens subunit having a negative refractive power, a second lens subunit having a negative refractive power, and a third lens subunit having a positive refractive power. The fourth lens unit satisfies the following conditional expression: 1.2<f41/f42<3.5, where f41 represents a focal length of the first lens subunit, and f42 represents a focal length of the second lens subunit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile