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. 09, 2012
Filed:
Jan. 14, 2011
Kenji Shinohara, Utsunomiya, JP;
Nobuyuki Miyazawa, Utsunomiya, JP;
Akihisa Horiuchi, Utsunomiya, JP;
Kenji Shinohara, Utsunomiya, JP;
Nobuyuki Miyazawa, Utsunomiya, JP;
Akihisa Horiuchi, Utsunomiya, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A zoom lens comprising, in order from an object side to an image side, a first lens unit of a positive refractive power, a second lens unit of a negative refractive power, a third lens unit of a positive refractive power, and a fourth lens unit of a positive refractive power. In zooming, the first lens unit is configured fixed and the second, third, and fourth lens units are configured movable. The following conditions are satisfied where f3st is a movement amount of the third lens unit associated with zooming from a wide angle end to a telephoto end, f3 is a focal length of the third lens unit, β2w is a lateral magnification of the second lens unit at the wide angle end, and z is a zoom ratio, 0.010<(|f3st|/f3)/z<0.045, and −0.33<β2w<−0.20.