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. 20, 2007
Filed:
Mar. 09, 2006
Hiroyuki Hamano, Koga, JP;
Hiroyuki Hamano, Koga, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
At least one exemplary embodiment is directed to a zoom lens system which includes a first lens unit having a positive optical power, a second lens unit having a negative optical power and positioned on the image side of the first lens unit, a third lens unit having a positive optical power and positioned on the image side of the second lens unit, a fourth lens unit having a positive optical power and positioned on the image side of the third lens unit, and an F-number determining member. The F-number determining member can be positioned between a vertex of an object-side lens surface of a lens that is nearest to an object side in the third lens unit and an intersecting point of the object-side lens surface and a peripheral portion of the lens in a direction of an optical axis.