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:
Oct. 22, 2013
Filed:
Mar. 13, 2012
Keigo Matsuo, Akiruno, JP;
Takayuki Mimura, Kawasaki, JP;
Kanato Adachi, Kawasaki, JP;
Hisashi Goto, Tokyo-to, JP;
Keigo Matsuo, Akiruno, JP;
Takayuki Mimura, Kawasaki, JP;
Kanato Adachi, Kawasaki, JP;
Hisashi Goto, Tokyo-to, JP;
Olympus Corporation, Tokyo, JP;
Abstract
A variable power optical system includes, in order from the object side, a first lens group having negative refractive power, a variable power group having positive refractive power, and a final lens group having positive refractive power. The variable power group is provided with, in order from the object side, a first lens element having positive refractive power, a second lens element, and a third lens element. The second lens element has a convex shape on the object side. The final lens group includes a positive lens. The variable power optical system satisfies the following conditions:10≦≦45−1.0<(22)/(22)<1.0where VdLg is the Abbe number of the positive lens of the final lens group with respect to the d line, Ris the curvature radius of the object-side surface of the second lens element, and Ris the curvature radius of the image-side surface of the third lens element.