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:
Dec. 28, 2010
Filed:
May. 27, 2009
Hideki Sakai, Utsunomiya, JP;
Hideki Sakai, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Provided is a zoom lens including in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a positive refractive power, each of the first lens unit, the second lens unit, the third lens unit, and fourth lens unit moving to perform zooming, in which Mrepresenting a moving amount of the third lens unit on an optical axis during zooming from a wide angle end to a telephoto end, Lt representing a total lens length on the telephoto end, frepresenting a focal length of the third lens unit, and ft representing a focal length of an entire lens system on the telephoto end are each appropriately set.