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:
Apr. 07, 2009
Filed:
Nov. 14, 2007
Toru Miyajima, Hachioji, JP;
Toru Miyajima, Hachioji, JP;
Olympus Imaging Corp., Tokyo, JP;
Abstract
A zoom lens system includes, in order from an object side, a first lens unit Ghaving a positive refracting power, a second lens unit Ghaving a negative refracting power, a third lens unit Ghaving a positive refracting power, and a fourth lens unit Ghaving a positive refracting power, and at the time of zooming from a wide angle end to a telephoto end, a space between the lens units changes, and the first lens unit includes two lenses namely, a negative lens and a positive lens, and satisfies the following conditional expression−0.75<SF<−0.1  (1) where, SFis defined as SF=(R+R)/(R−R), when Ris a paraxial radius of curvature of a surface on the object side, of the positive lens in the first lens unit, and Ris a paraxial radius of curvature of a surface on an image side, of the positive lens in the first lens unit.