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:
Jun. 05, 2007
Filed:
Jul. 20, 2006
Hiroyuki Hamano, Koga, JP;
Nobuyuki Miyazawa, Utsunomiya, JP;
Hiroyuki Hamano, Koga, JP;
Nobuyuki Miyazawa, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
At least one exemplary embodiment is directed to a four-group zoom lens system including, in order from the object side to the image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power and including a negative first lens sub-unit and a positive second lens sub-unit in order from the object side to the image side, and a fourth lens unit having positive refractive power. During zooming, the second and fourth lens units can be moved along an optical axis and the second lens sub-unit can be moved substantially orthogonal to the optical axis. When f1 represents the focal length of the first lens unit, f3and f3represents the focal length of the first and second lens sub-units, respectively, satisfy 0.4<f3/f1<0.70 and 0.5<|f3/f3|<0.8.