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:
Aug. 01, 2017
Filed:
Jun. 18, 2013
Sony Corporation, Tokyo, JP;
Motoyuki Otake, Saitama, JP;
Naoki Miyagawa, Kanagawa, JP;
SONY CORPORATION, Tokyo, JP;
Abstract
A variable focal length lens system includes: first to fourth lens groups alternately having negative and positive refractive power; and an aperture stop; the first to fourth lens group being arranged to allow a space between the first and second lens groups to be decreased and spaces between the second and third lens groups and between the third and fourth lens groups to be varied, the third lens group travelling to allow image-plane position variation caused by subject position variation to be compensated and satisfying a following conditional expression,0.05<3<0.5  (1) where Da is a distance from the aperture stop to a most image-sided lens surface in the third lens group in the wide end state, and R3is a curvature radius of the most-image sided lens surface in the third lens group.