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1. EP3327480 - ZOOM LENS SYSTEM, IMAGING OPTICAL DEVICE, AND DIGITAL APPARATUS

Office European Patent Office
Application Number 17203629
Application Date 24.11.2017
Publication Number 3327480
Publication Date 30.05.2018
Publication Kind B1
IPC
G02B 15/14
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
CPC
G02B 15/177
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
16with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
177having a negative front lens or group of lenses
G02B 15/144507
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
144having four groups only
1445the first group being negative
144507arranged -++-
G02B 15/145515
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
145having five groups only
1455the first group being negative
145515arranged -+++-
G02B 15/1465
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
146having more than five groups
1465the first group being negative
Applicants KONICA MINOLTA INC
Inventors SOUMA YOSHIHITO
Designated States
Priority Data 2016231075 29.11.2016 JP
Title
(DE) ZOOMOBJEKTIVSYSTEM, OPTISCHE BILDGEBUNGSVORRICHTUNG UND DIGITALE VORRICHTUNG
(EN) ZOOM LENS SYSTEM, IMAGING OPTICAL DEVICE, AND DIGITAL APPARATUS
(FR) SYSTÈME DE LENTILLE À FOCALE VARIABLE, DISPOSITIF D'IMAGERIE OPTIQUE ET APPAREIL NUMÉRIQUE
Abstract
(EN)
A zoom lens system includes, in order from an object side: a first, negative, lens group; a second, positive, lens group; a third, positive, lens group; and a fourth, negative, lens group. From a wide angle end to a telephoto end, Gr1-Gr2 and Gr2-Gr3 distances are reduced and Gr3-Gr4 distance is increased, Gr representing lens group. The second lens group includes a second-a, positive, lens group and a second-b lens group, and the second-a lens group is moved toward an image side for focusing to a nearby object. Conditional formula, 0.6 < f4/f1 < 5.0, -2.0 < (1 - ²2w 2 ) × ²rw 2 < -0.1, is satisfied (²2w: a paraxial lateral magnification of the second-a lens group at the wide angle end; ²rw: a composite paraxial lateral magnification of the second-b lens group and subsequent lens groups at the wide angle end; f1, f4: focal lengths of the first, fourth lens groups).

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