公开(公告)号：US20170293122A1

公开(公告)日：2017-10-12

申请号：US15479714

申请日：2017-04-05

Applicant: OLYMPUS CORPORATION

Inventor： Kazuteru KAWAMURA ,  Koji NAKAGAWA ,  Masahiro IMAMURA

IPC: G02B15/16 ,  G02B27/00 ,  G02B27/64 ,  G02B15/163

CPC classification number: G02B15/16 ,  G02B15/163 ,  G02B15/173 ,  G02B27/0025 ,  G02B27/646

Abstract: A variable magnification optical system includes: in order from an object side, a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and an image-side lens unit. The image-side lens unit includes a lens belonging to a first region and a lens belonging to a second region. At a time of changing magnification, the second lens unit and the third lens unit move.

公开(公告)号：US20180100995A1

公开(公告)日：2018-04-12

申请号：US15840671

申请日：2017-12-13

Applicant: OLYMPUS CORPORATION

Inventor： Akinori NISHIO ,  Koji NAKAGAWA

IPC: G02B15/177 ,  G02B15/20 ,  G02B13/00 ,  H04N5/232

CPC classification number: G02B15/177 ,  G02B13/0045 ,  G02B13/009 ,  G02B13/18 ,  G02B15/20 ,  H04N5/23296

Abstract: A zoom lens includes, in order from the object side, a first lens unit having negative refractive power, a second lens unit having positive refractive power, a third lens unit having negative refractive power, and a fourth lens unit having positive refractive power. At a time of zooming from a wide-angle end to a telephoto end, the distance between the first lens unit and the second lens unit is reduced, the distance between the third lens unit and the fourth lens unit is increased, the fourth lens unit is fixed, and Conditional Expressions (1) and (2) below are satisfied: 2.5≤f2/fw4.5  (1), and 4.3≤Δ2GWT/fw≤8.0  (2).