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1. (WO2014192507) ZOOM LENS AND IMAGE CAPTURE DEVICE COMPRISING SAME

Pub. No.:    WO/2014/192507    International Application No.:    PCT/JP2014/062226
Publication Date: Fri Dec 05 00:59:59 CET 2014 International Filing Date: Thu May 08 01:59:59 CEST 2014
IPC: G02B 15/20
Applicants: OLYMPUS CORPORATION
オリンパス株式会社
Inventors: TAKADA Keisuke
高田圭輔
FUJIKURA Takashi
藤倉崇
Title: ZOOM LENS AND IMAGE CAPTURE DEVICE COMPRISING SAME
Abstract:
A zoom lens comprises a plurality of lens groups, in order from the object side, a first lens group (G1) having a positive refractive index, a second lens group (G2) having a negative refractive index, and a final lens group having a negative refractive index. Among the plurality of lens groups, the final lens group is located most toward the image side. When changing magnification from wide angle mode to telephoto mode, the interval of each lens group changes, and the first lens group (G1) moves toward the object side, satisfying the following conditional formula (1): 0.2<(βlt/βlw)/(ft/fw)<0.7 (1). βlt is the lateral magnification of the final lens group in telephoto mode, βlw is the lateral magnification of the final lens group in wide angle mode, ft is the focal length of the overall zoom lens assembly in telephoto mode, and fw is the focal length of the overall zoom lens assembly in wide angle mode.