公开(公告)号：US20190049706A1

公开(公告)日：2019-02-14

申请号：US15962509

申请日：2018-04-25

Applicant: Tamron Co., Ltd.

Inventor： Keisuke Okada

IPC: G02B15/14 ,  G02B27/00 ,  G02B7/14 ,  G02B7/04 ,  G02B13/06 ,  H04N5/225 ,  H04N5/335

Abstract: An object of the present invention is to provide a zoom lens that can perform favorable correction of chromatic aberration in the entire zoom range, and can have higher performance and a smaller size than conventional ones; and an imaging apparatus including the zoom lens. To achieve the object, provided are a zoom lens and an imaging apparatus including the zoom lens. The zoom lens includes, in order from an object side: a positive first lens group G1; a negative second lens group G2; and a GR group including one or more lens groups. In the zoom lens, changing focal length is performed by varying intervals between the lens groups. The GR group includes convex lenses GpH and GpL satisfying predetermined conditional expressions. The convex lens GpH is the positive lens which is arranged second position or after from the object side in positive lenses in the GR group.

公开(公告)号：US20150381863A1

公开(公告)日：2015-12-31

申请号：US14751344

申请日：2015-06-26

Applicant: Tamron Co., Ltd.

Inventor： Keisuke Okada ,  Shingo Abe

IPC: H04N5/225 ,  G02B27/64

CPC classification number: G02B27/646 ,  G02B9/64 ,  G02B13/16 ,  H04N5/23209 ,  H04N5/23248 ,  H04N5/23287

Abstract: An optical system including: a first lens group Gf; a vibration control lens group Gvc; and a third lens group Gr, the first lens group Gf, the vibration control lens group Gvc, and the third lens group Gr being provided in order from an object side. The third lens group Gr has at least one lens having negative refractive power, and specified conditional expressions are satisfied.

Abstract translation: 一种光学系统，包括：第一透镜组Gf; 振动控制透镜组Gvc; 第三透镜组Gr，第一透镜组Gf，振动控制透镜组Gvc和第三透镜组Gr从物体侧开始依次设置。 第三透镜组Gr具有至少一个具有负屈光力的透镜，并且满足特定的条件表达式。