公开(公告)号：US20180329186A1

公开(公告)日：2018-11-15

申请号：US15948155

申请日：2018-04-09

Applicant: OLYMPUS CORPORATION

Inventor： Takashi FUJIKURA ,  Yuki ZEN ,  Tomoyuki SATORI ,  Tetsuya YANAI

IPC: G02B15/15 ,  G02B9/64

CPC classification number: G02B15/15 ,  G02B9/64

Abstract: A variable magnification optical system includes 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 at least one lens unit. A second predetermined positive lens element satisfies conditional expressions (1) and (2) and a second predetermined negative lens element satisfies the following conditional expressions (3) and (4). The second lens unit includes three sub-lens units and the following conditional expressions (5) and (6) are satisfied: 0.520

公开(公告)号：US20180267279A1

公开(公告)日：2018-09-20

申请号：US15853235

申请日：2017-12-22

Applicant: OLYMPUS CORPORATION

Inventor： Takashi FUJIKURA ,  Yuki ZEN ,  Tomoyuki SATORI ,  Tetsuya YANAI

IPC: G02B15/167 ,  G02B15/20

CPC classification number: G02B15/167 ,  G02B15/173 ,  G02B15/20

Abstract: A variable magnification optical system includes a plurality of lens element, and 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 at least one lens unit. An aperture stop is either positioned between the second lens unit and the third lens unit, or positioned in the third lens unit. At the time of zooming from a wide angle end to a telephoto end, the first lens unit is fixed, the second lens unit moves from the object side to an image-plane side, and at least one of lens units positioned on an image side of the aperture stop moves. The first lens unit includes at least four positive lens elements and at least two negative lens elements.