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公开(公告)号：US08908297B2
公开(公告)日：2014-12-09
申请号：US14063691
申请日：2013-10-25
Applicant: Tamron Co., Ltd.
Inventor： Nobuyuki Adachi , Yasuhiko Obikane , Takahiko Sakai
CPC classification number: G02B13/0015 , G02B9/12 , G02B9/62 , G02B9/64 , G02B13/00
Abstract: A fixed focus lens comprising, sequentially from an object side, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power. The first lens group includes an aperture stop. The second lens group is configured by a single lens element. During focusing, the second lens group moves along an optical axis and the first lens group and the third lens group are fixed with respect to an imaging plane.
Abstract translation: 一种固定聚焦透镜，其从物体侧依次具有正屈光力的第一透镜组; 具有负屈光力的第二透镜组; 以及具有正屈光力的第三透镜组。 第一透镜组包括孔径光阑。 第二透镜组由单个透镜元件构成。 在聚焦期间，第二透镜组沿光轴移动，第一透镜组和第三透镜组相对于成像平面固定。
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Patent Agency Ranking
公开(公告)号：US20140049845A1
公开(公告)日：2014-02-20
申请号：US14063691
申请日：2013-10-25
Applicant: TAMRON CO., LTD.
Inventor： Nobuyuki ADACHI , Yasuhiko Obikane , Takahiko Sakai
IPC: G02B13/00
CPC classification number: G02B13/0015 , G02B9/12 , G02B9/62 , G02B9/64 , G02B13/00
Abstract: A fixed focus lens comprising, sequentially from an object side, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power. The first lens group includes an aperture stop. The second lens group is configured by a single lens element. During focusing, the second lens group moves along an optical axis and the first lens group and the third lens group are fixed with respect to an imaging plane.
Abstract translation: 一种固定聚焦透镜，其从物体侧依次具有正屈光力的第一透镜组; 具有负屈光力的第二透镜组; 以及具有正屈光力的第三透镜组。 第一透镜组包括孔径光阑。 第二透镜组由单个透镜元件构成。 在聚焦期间，第二透镜组沿光轴移动，第一透镜组和第三透镜组相对于成像平面固定。
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公开(公告)号：US09645353B2
公开(公告)日：2017-05-09
申请号：US15050852
申请日：2016-02-23
Applicant: Tamron Co., Ltd.
Inventor： Hisayuki Yamanaka , Keisuke Okada , Takahiko Sakai , Yoshito Iwasawa
CPC classification number: G02B9/64 , G02B13/005 , G02B13/006 , G02B27/0025 , G02B27/646
Abstract: An optical system of the present invention includes, in order from an object side: a first lens group G1; a second lens group G2 having positive refractive power; and a third lens group G3 having positive refractive power, wherein the first lens group G1 and the third lens group G3 are fixed in an optical axis direction while the second lens group G2 is moved in an optical axis direction to focus on from an object at infinity to an object at a finite distance, and specified conditions is satisfied.
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公开(公告)号：US09841608B2
公开(公告)日：2017-12-12
申请号：US14565777
申请日：2014-12-10
Applicant: TAMRON CO., LTD.
Inventor： Takahiko Sakai
CPC classification number: G02B27/646 , G02B15/17
Abstract: An inner focus lens includes sequentially from an object side, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a negative refractive power. The second lens group is moved along an optical axis, whereby focusing from a focus state for an object at infinity to a focus state for a minimum object distance is performed. A lens group configured by a lens other than a lens that is disposed farthest on the object side is moved in a direction orthogonal to the optical axis to shift an image. The inner focus lens satisfies a conditional expression (1) 0.15≦(1−βp)×βr≦4.50, where βp is transverse magnification of the orthogonally moved lens group and βr is composite transverse magnification of a lens group disposed farther on an image side than the orthogonally moved lens group.
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公开(公告)号：US09678305B2
公开(公告)日：2017-06-13
申请号：US14565705
申请日：2014-12-10
Applicant: TAMRON CO., LTD.
Inventor： Takahiko Sakai
CPC classification number: G02B9/62 , G02B9/60 , G02B27/646
Abstract: An inner focus lens includes sequentially from an object side, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a negative refractive power. The second lens group is moved along the optical axis, whereby focusing from a focus state for an object at infinity to a focus state for a minimum object distance is performed. The inner focus lens satisfies a conditional expression (1) −29.0≦f3/f≦−5.4, where f3 is a focal length of the third lens group at the focus state for an object at infinity and f is a focal length of the optical system overall at the focus state for an object at infinity.
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公开(公告)号：US20160252706A1
公开(公告)日：2016-09-01
申请号：US15050852
申请日：2016-02-23
Applicant: Tamron Co., Ltd.
Inventor： Hisayuki Yamanaka , Keisuke Okada , Takahiko Sakai , Yoshito Iwasawa
CPC classification number: G02B9/64 , G02B13/005 , G02B13/006 , G02B27/0025 , G02B27/646
Abstract: An optical system of the present invention includes, in order from an object side: a first lens group G1; a second lens group G2 having positive refractive power; and a third lens group G3 having positive refractive power, wherein the first lens group G1 and the third lens group G3 are fixed in an optical axis direction while the second lens group G2 is moved in an optical axis direction to focus on from an object at infinity to an object at a finite distance, and specified conditions is satisfied.
Abstract translation: 本发明的光学系统从物体侧起依次包括：第一透镜组G1; 具有正折射力的第二透镜组G2; 和具有正折光力的第三透镜组G3，其中第一透镜组G1和第三透镜组G3在光轴方向上固定，而第二透镜组G2沿光轴方向移动以从物体聚焦 无限远到有限距离的物体，并且满足指定的条件。
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