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:
Jul. 12, 2016
Filed:
Nov. 17, 2014
Olympus Corporation, Tokyo, JP;
Keigo Matsuo, Akiruno, JP;
Takayuki Mimura, Kawasaki, JP;
Kanato Adachi, Kawasaki, JP;
Hisashi Goto, Suginami-ku, JP;
OLYMPUS CORPORATION, Tokyo, JP;
Abstract
Provided are a variable power optical system in which the value of the entire length with respect to the image height is reduced and the aberration is well corrected, and an image pickup device comprising the same. Specifically provided is a variable power optical system comprising, in order from the object side, at least 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, wherein 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, and the final lens group comprises a positive lens, the variable power optical system satisfying the following conditional expression: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.