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. 24, 2015
Filed:
Jul. 15, 2013
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Kenji Shinohara, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 13/00 (2006.01); G02B 15/14 (2006.01); G03B 17/00 (2006.01); H04N 5/232 (2006.01); G02B 15/177 (2006.01);
U.S. Cl.
CPC ...
G02B 15/14 (2013.01); H04N 5/23296 (2013.01); G02B 15/177 (2013.01);
Abstract
A zoom lens includes, in order from an object side to an image side, a first lens unit having negative refractive power, a second lens unit having positive refractive power, a third lens unit having negative refractive power, and a fourth lens unit having positive refractive power. During zooming, a distance between every adjacent lens unit from the first to fourth lens units varies. A focal length fw of the entire zoom lens at a wide-angle end, a focal length f1 of the first lens unit, and a focal length f4 of the fourth lens unit are appropriately set according to predetermined mathematical conditions.