公开(公告)号：US20220171159A1

公开(公告)日：2022-06-02

申请号：US17479150

申请日：2021-09-20

Applicant: TAMRON CO., LTD.

Inventor： Toshiya SEGAWA ,  Yuki MORI ,  Hirofumi TABATA

IPC: G02B9/60 ,  G02B27/00 ,  G02B7/04

Abstract: There is provided: an optical system including a focus lens group having positive refractive power and configured to move along an optical axis when focusing from an infinite-distance object to a short-distance object, and satisfying predetermined conditional expressions; and an imaging device including the optical system. The focus lens group includes a lens subgroup A, an aperture stop, and a lens subgroup B in order from the object side. The lens subgroup A includes a negative lens, a positive lens, and a positive lens in order from the image side. The lens subgroup B includes a negative lens and a positive lens in order from the object side.

公开(公告)号：US20210199939A1

公开(公告)日：2021-07-01

申请号：US16992512

申请日：2020-08-13

Applicant: TAMRON CO., LTD.

Inventor： Hirofumi TABATA ,  Takahiro MITSUHASHI ,  Toshiya SEGAWA

IPC: G02B15/20 ,  G02B15/14 ,  G02B27/00

Abstract: A zoom lens includes, in order from an object side, a first lens group that is positive, a second lens group that is negative, a third lens group that is positive, and a fourth lens group that is positive. During zooming from a wide angle end to a telephoto end, at least the first lens group and the third lens group are fixed and an interval on an optical axis of an adjacent lens group relative thereto is changed. In the zoom lens, the fourth lens group includes at least one positive lens and satisfies a predetermined conditional expression. In addition, an imaging device includes the zoom lens and an image sensor.

公开(公告)号：US20220163766A1

公开(公告)日：2022-05-26

申请号：US17479365

申请日：2021-09-20

Applicant: TAMRON CO., LTD.

Inventor： Toshiya SEGAWA ,  Yuki MORI ,  Hirofumi TABATA

IPC: G02B9/64 ,  G02B27/00

Abstract: There are provided an optical system and an imaging device including the same. The optical system includes: in order from an object side to an image side, a first lens group having refractive power; and a second lens group having positive refractive power. A variable distance that varies during focusing between the first lens group and the second lens group is closer to an object than a variable distance that varies during focusing between other lenses. The first lens group includes a positive lens and at least one or more negative lenses in order from the image side. The second lens group includes a lens subgroup 2A having positive refractive power, an aperture stop, and a lens subgroup 2B having positive refractive power in order from the object side. The lens subgroup 2B includes a negative lens and a positive lens in order from the object side and satisfies a predetermined Conditional Expression.

公开(公告)号：US20220171160A1

公开(公告)日：2022-06-02

申请号：US17479480

申请日：2021-09-20

Applicant: TAMRON CO., LTD.

Inventor： Toshiya SEGAWA ,  Yuki MORI ,  Hirofumi TABATA

IPC: G02B9/60 ,  G02B7/04

Abstract: There is provided: an optical system including a focus lens group having positive refractive power and configured to move along an optical axis when focusing from an infinite-distance object to a short-distance object, and satisfying predetermined conditional expressions; and an imaging device including the optical system. The focus lens group includes a lens subgroup A, an aperture stop, and a lens subgroup B in order from the object side. The lens subgroup A includes a negative lens, a positive lens, and a positive lens in order from the image side. The lens subgroup B includes a negative lens and a positive lens in order from the object side.

公开(公告)号：US20160187629A1

公开(公告)日：2016-06-30

申请号：US14830903

申请日：2015-08-20

Applicant: TAMRON CO., LTD.

Inventor： Hirofumi TABATA

IPC: G02B15/177 ,  G02B13/18 ,  G02B15/20 ,  G02B27/00 ,  G02B5/00

CPC classification number: G02B15/177 ,  G02B5/005 ,  G02B13/18 ,  G02B15/20 ,  G02B27/0068

Abstract: A zoom lens includes sequentially from an object side, a first lens group having a negative refractive power; a second lens group having a positive refractive power; and a third lens group. The zoom lens performs zooming by varying intervals of the first, the second, and the third lens groups, on an optical axis. The second lens group is configured to include sequentially from the object side, a positive lens, a negative lens, and a positive lens. The third lens group is configured to include a negative lens farthest on the object side. The zoom lens satisfies a condition expression (1) 2.8≦|β2T/β2W|≦12.0, where β2T represents magnification of the second lens group at a telephoto edge, and β2W represents magnification of the second lens group at a wide angle edge.

Abstract translation: 变焦透镜从物体侧顺序地包括具有负折光力的第一透镜组; 具有正屈光力的第二透镜组; 和第三透镜组。 变焦透镜通过在光轴上改变第一透镜组和第三透镜组的间隔进行变焦。 第二透镜组被配置为从物体侧顺次包括正透镜，负透镜和正透镜。 第三透镜组被配置为在物体侧包括最远的负透镜。 变焦透镜满足条件表达式（1）2.8＆nlE; |＆bgr; 2T /＆bgr; 2W |＆nlE; 12.0其中＆bgr; 2T表示在远摄端处的第二透镜组的倍率，＆amp; bgr; 2W表示 第二透镜组在广角边缘。