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:
Mar. 17, 2009
Filed:
Feb. 22, 2007
Hiroyuki Hamano, Koga, JP;
Nobuyuki Miyazawa, Utsunomiya, JP;
Hiroyuki Hamano, Koga, JP;
Nobuyuki Miyazawa, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
At least one exemplary embodiment is directed to a zoom lens includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and an image-side lens unit in order from an object side to an image side wherein an interval between the first lens unit and the second lens unit varies during zooming, the first lens unit includes an optical element having a positive refractive power and made of a solid material having an Abbe number (νd) and a relative partial dispersion (ΘgF) satisfying the following conditions:0.755Θ−(−1.665×10+5.213×10−5.656×10−3)<1.011and1.6<(1)<5.6,wherein fis the focal length of the first lens unit and ft is the focal length of the zoom lens at a telephoto end.