公开(公告)号：US20160124200A1

公开(公告)日：2016-05-05

申请号：US14829976

申请日：2015-08-19

Applicant: TAMRON CO., LTD.

Inventor： Yasuhiko OBIKANE ,  Koichiro YOKOTA

IPC: G02B15/20 ,  G02B27/00 ,  H04N5/225 ,  H04N5/232 ,  G02B13/00 ,  G02B27/64 ,  G02B15/177

CPC classification number: G02B15/20 ,  G02B13/009 ,  G02B15/177 ,  G02B27/0025 ,  G02B27/646

Abstract: A zoom lens includes sequentially from an object side a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a negative refractive power; and a fourth lens group having a negative refractive power. The first lens group, the second lens group, the third lens group, and the fourth lens group are moved along an optical axis to zoom from a wide angle end to telephoto end and such that an interval between the first lens group and the second lens group decreases and distances that the second lens group and the fourth lens group are moved are equivalent. The third lens group is moved along the optical axis, toward an image side to focus from a focused state at infinity to a focused state at a minimum object distance.

Abstract translation: 变焦透镜从物体侧依次包括具有负屈光力的第一透镜组; 具有正屈光力的第二透镜组; 具有负屈光力的第三透镜组; 以及具有负屈光力的第四透镜组。 第一透镜组，第二透镜组，第三透镜​​组和第四透镜组沿着光轴移动以从广角端到远摄端变焦，并且使得第一透镜组和第二透镜组之间的间隔 组减少，第二透镜组和第四透镜组移动的距离相等。 第三透镜组沿着光轴朝向图像侧移动，以在无限远的聚焦状态下以最小对象距离聚焦到聚焦状态。