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. 21, 2014
Filed:
Nov. 14, 2012
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Yoshiyuki Taki, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01); H04N 5/225 (2006.01); G02B 15/16 (2006.01); G02B 15/20 (2006.01);
U.S. Cl.
CPC ...
G02B 15/14 (2013.01); G02B 15/16 (2013.01); H04N 5/225 (2013.01); G02B 15/20 (2013.01);
Abstract
A zoom lens includes a negative lens unit having a negative refractive power and a positive lens unit having a positive refractive power arranged in order from an object side to an image side. For focusing from infinity to a closest distance, the negative lens unit moves towards the image side and the positive lens unit moves towards the object side. Predetermined mathematical conditions are satisfied to obtain high optical performance over the entire focusing range.