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. 30, 2008
Filed:
May. 22, 2008
Hiroshi Saruwatari, Utsunomiya, JP;
Hiroshi Saruwatari, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A zoom lens system includes, in order from an object side to an image side, a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power, and a fourth lens unit having positive optical power. Each lens unit moves during zooming. In particular, the first lens unit moves so as to be closer to an object at a telephoto end than at a wide-angle end during zooming, and the fourth lens unit moves in a locus convex toward the object side during zooming. The sharing of magnification variation between the third lens unit and the fourth lens unit is appropriately set.