Variable magnification optical system and imaging apparatus

    公开(公告)号:US11567307B2

    公开(公告)日:2023-01-31

    申请号:US17094288

    申请日:2020-11-10

    Abstract: A variable magnification optical system consists of, in order from an object side to an image side, a first lens group, a second lens group, and a subsequent lens group. The variable magnification optical system satisfies a predetermined conditional expression for a partial dispersion ratio related to F line, C line, and a wavelength of 1970.09 nm, a d-line back focus of the variable magnification optical system at a telephoto end, a back focus in any one wavelength from a wavelength of 1300 nm to a wavelength of 2325.42 nm at the telephoto end, and a d-line focal length of the variable magnification optical system at the telephoto end.

    Dome-type camera and dome cover
    13.
    发明授权

    公开(公告)号:US10412277B2

    公开(公告)日:2019-09-10

    申请号:US15715494

    申请日:2017-09-26

    Abstract: A dome-type camera includes a dome cover (11) and a camera unit (12). The dome cover (11) has a front surface (21) and a back surface (22). The camera unit (12) includes an optical system (13) and an imaging element (14). The optical system (13) is disposed on the back surface (22) side of the dome cover (11), and the imaging element (14) outputs image data on the basis of imaging light received via the optical system (13). At least the back surface (22) out of the front surface (21) and the back surface (22) of the dome cover (11) has at least an aspheric shape in which optical properties are continuously changed at a location other than a top t of the dome cover (11).

    Zoom lens and imaging apparatus
    14.
    发明授权
    Zoom lens and imaging apparatus 有权
    变焦镜头和成像设备

    公开(公告)号:US09519126B2

    公开(公告)日:2016-12-13

    申请号:US14702952

    申请日:2015-05-04

    Abstract: A zoom lens consists of a positive first lens group, a negative second lens group moved from the object side to the image plane side during zooming from the wide angle end to the telephoto end, a positive third lens group moved during zooming, and a positive fourth lens group, in order from the object side. The second and third lens groups each pass through a point where the imaging magnification of each corresponding lens group is −1× at the same time during zooming from the wide angle end to the telephoto end. The fourth lens group includes, on the most object side, a vibration-proof lens group, composed of a negative lens, a positive meniscus lens with a convex surface on the object side, and a negative lens, in order from the object side, and either one of the negative lenses satisfies predetermined conditional expressions.

    Abstract translation: 变焦透镜由从正面的第一透镜组,从第二透镜组的广角端到望远端的变焦期间从物体侧向像面侧移动的负的第二透镜组,在变焦期间移动的正的第三透镜组和正的 第四透镜组,从物体侧开始。 第二透镜组和第三透镜组在从广角端到望远端的变焦期间同时通过每个对应透镜组的成像倍率为-1×的点。 第四透镜组在物体侧依次包括由负透镜构成的防振透镜组,物体侧具有凸面的正弯月透镜和负透镜, 并且负透镜中的任一个满足预定条件表达式。

    Zoom lens and imaging apparatus
    15.
    发明授权
    Zoom lens and imaging apparatus 有权
    变焦镜头和成像设备

    公开(公告)号:US09239451B2

    公开(公告)日:2016-01-19

    申请号:US14565741

    申请日:2014-12-10

    CPC classification number: G02B15/173 G02B13/18

    Abstract: The zoom lens substantially consists of a positive first lens group which is fixed while changing magnification, a negative second lens group which moves while changing magnification, a positive third lens group which moves while changing magnification, and a positive fourth lens group which is fixed while changing magnification in this order from the object side. The image formation magnification rates of the second lens group and the third lens group simultaneously pass a −1× point while changing magnification from the wide angle to the telephoto. The second lens group substantially consists of a negative second-a lens group and a positive second-b lens group which independently move while changing magnification in this order from the object side, and the third lens group substantially consists of a positive third-a lens group and a positive third-b lens group which independently move while changing magnification in this order from the object side.

    Abstract translation: 变焦透镜基本上由变倍放大时固定的正的第一透镜组,在改变倍率时移动的负的第二透镜组,在改变倍率时移动的正的第三透镜组以及固定的正的第四透镜组 从物体侧以此顺序改变放大倍率。 第二透镜组和第三透镜组的图像形成倍率在从广角向远摄改变倍率的同时通过-1×点。 第二透镜组基本上由负的第二透镜组和正的第二b透镜组组成,其在从物体侧依次改变倍率的同时独立地移动,并且第三透镜组基本上由正的第三透镜组 组和正的第三-B透镜组,其在从物体侧按照该顺序改变放大率时独立地移动。

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