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    • 3. 发明申请
    • ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE ZOOM LENS
    • 变焦镜头和图像拾取装置,包括变焦镜头
    • US20160124199A1
    • 2016-05-05
    • US14920231
    • 2015-10-22
    • CANON KABUSHIKI KAISHA
    • Yotaro SanjoYutaka IriyamaTomoya YamadaMasakazu Kodaira
    • G02B15/173G02B15/20G02B27/00
    • G02B15/20G02B15/17
    • A zoom lens include, from an object side: a positive first unit that does not move for zooming; a negative second unit that moves during zooming; a negative third unit that moves during zooming; a positive fourth unit that moves during zooming; and a positive fifth unit, wherein the second unit moves towards the image side during zooming towards a telephoto end, the third unit moves towards the object side during focus adjustment towards a close distance, and a focal length of the zoom lens at the wide angle end, a zoom ratio, a focal length of the zoom lens at a zoom position where the third unit is closest to the object, a focal length of the first unit, a focal length of the second unit, a focal length of the third unit, and a focal length of the fourth unit are appropriately set.
    • 变焦透镜包括:物体侧:不能移动用于变焦的正的第一单元; 在缩放期间移动的负第二单元; 在缩放期间移动的负第三单元; 在变焦期间移动的正的第四单元; 以及正的第五单元,其中所述第二单元在朝向望远端变焦期间朝向所述图像侧移动,所述第三单元在聚焦调整期间向近距离移动,并且所述变焦透镜在广角处的焦距 在第三单元最靠近物体的变焦位置处的变焦镜头的焦距,第一单元的焦距,第二单元的焦距,第三单元的焦距, ,并且适当地设定第四单元的焦距。