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    • 1. 发明授权
    • Zoom lens and image pickup apparatus including the same
    • 缩放透镜和包括其的图像拾取装置
    • US09148575B2
    • 2015-09-29
    • US14217686
    • 2014-03-18
    • CANON KABUSHIKI KAISHA
    • Shinji Yamasaki
    • H04N5/232G02B15/14G02B13/00G02B15/177
    • H04N5/23296G02B13/009G02B15/177H04N5/23212
    • A zoom lens includes first, second, and third lens units respectively having negative, positive, and negative refractive powers in this order from an object side to an image side. The lens units move during zooming such that the spacing between adjacent lens units changes, the second and third lens units are positioned on the object side at a telephoto end when compared to a wide angle end, and the third lens unit moves during focusing. A lateral magnification of the second lens unit at the wide angle end, a lateral magnification of the second lens unit at the telephoto end, a lateral magnification of the third lens unit at the wide angle end, a lateral magnification of the third lens unit at the telephoto end, a focal length of the first lens unit, and a focal length of the second lens unit are appropriately set.
    • 变焦透镜包括从物体侧到像侧依次具有负的,正的和负的折射光焦度的第一,第二和第三透镜单元。 透镜单元在变焦期间移动,使得相邻透镜单元之间的间隔改变,当与广角端相比时,第二和第三透镜单元在望远端处于物体侧,并且第三透镜单元在聚焦期间移动。 广角端的第二透镜单元的横向放大率,第二透镜单元在望远端的横向放大率,第三透镜​​单元在广角端的横向放大率,第三透镜​​单元在横向放大倍率 适当地设定长焦端,第一透镜单元的焦距和第二透镜单元的焦距。
    • 3. 发明申请
    • ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME
    • 变焦镜头和图像拾取装置包括它们
    • US20130278814A1
    • 2013-10-24
    • US13866746
    • 2013-04-19
    • CANON KABUSHIKI KAISHA
    • Shinji Yamasaki
    • G02B15/14
    • G02B15/14G02B15/173G02B27/646
    • A zoom lens includes, in order from an object side toward an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. The second lens unit, the third lens unit, and the fourth lens unit are moved during zooming. A position of the third lens unit at a telephoto end is closer to the object side than a position of the third lens unit at a wide-angle end. The focal length of the zoom lens at the wide-angle end, the difference in the position of the second lens unit on an optical axis between that at the wide-angle end and that at the telephoto end, and the focal length of the second lens unit are set appropriately.
    • 变焦透镜从物体侧朝向像侧依次包括具有正折光力的第一透镜单元,具有负屈光力的第二透镜单元,具有正折光力的第三透镜单元和第四透镜 具有正屈光力的单元。 第二透镜单元,第三透镜​​单元和第四透镜单元在变焦期间移动。 第三透镜单元在望远端的位置比第三透镜单元在广角端处的位置更靠近物体侧。 变焦镜头在广角端的焦距,第二透镜单元在光轴上的广角端与远摄端之间的位置差与第二透镜单元的焦距 镜头单元设置正确。