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公开(公告)号：US12181731B2
公开(公告)日：2024-12-31
申请号：US17479365
申请日：2021-09-20
Applicant: TAMRON CO., LTD.
Inventor： Toshiya Segawa , Yuki Mori , Hirofumi Tabata
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.
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公开(公告)号：US11994745B2
公开(公告)日：2024-05-28
申请号：US17479480
申请日：2021-09-20
Applicant: TAMRON CO., LTD.
Inventor： Toshiya Segawa , Yuki Mori , Hirofumi Tabata
CPC classification number: G02B9/60 , G02B7/04 , G02B27/0025
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.
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公开(公告)号：US11880023B2
公开(公告)日：2024-01-23
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
CPC classification number: G02B15/143507 , G02B15/144511 , 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.
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公开(公告)号：US11899280B2
公开(公告)日：2024-02-13
申请号：US17479150
申请日：2021-09-20
Applicant: TAMRON CO., LTD.
Inventor： Toshiya Segawa , Yuki Mori , Hirofumi Tabata
CPC classification number: G02B9/60 , G02B7/04 , G02B27/0025
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.
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