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：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：US20220163765A1

公开(公告)日：2022-05-26

申请号：US17479296

申请日：2021-09-20

Applicant: TAMRON CO., LTD.

Inventor： Toshiya SEGAWA ,  Yuki MORI

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

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：US20210294082A1

公开(公告)日：2021-09-23

申请号：US17093829

申请日：2020-11-10

Applicant: TAMRON CO., LTD.

Inventor： Masaki SATO ,  Yuki MORI ,  Hironori TAGUCHI

IPC: G02B15/14 ,  G02B15/177

Abstract: A zoom lens according to the present invention includes sequentially from an object side: a first lens group having negative refractive power, and a second lens group having positive refractive power, and performs a magnification change operation by changing a gap between the adjacent lens groups. The zoom lens has specific optical characteristics represented by four expressions relating to the second lens group.

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.