公开(公告)号：US20120212835A1

公开(公告)日：2012-08-23

申请号：US13369777

申请日：2012-02-09

申请人： Hirohiko KIMATA ,  Yasuharu Yamada ,  Yasuji Ogata ,  Kazuteru Kawamura ,  Kenichi Nagasawa ,  Hiroshi Kodama ,  Toshio Takahashi ,  Kento Kokubu

发明人： Hirohiko KIMATA ,  Yasuharu Yamada ,  Yasuji Ogata ,  Kazuteru Kawamura ,  Kenichi Nagasawa ,  Hiroshi Kodama ,  Toshio Takahashi ,  Kento Kokubu

IPC分类号： G02B15/22 ,  G02B15/14

CPC分类号： G02B15/22 ,  G02B15/14 ,  G02B15/173 ,  G02B15/177

摘要： In a zoom lens of a fixed total length, at the time of changing the magnification from the wide-angle end toward the telephoto end, the first lens group is anchored while the second lens group is moved, and the third and fourth lens groups are moved so as to be located at the object side of the telephoto end relative to the wide-angle end, such that: the interval between the second and third lens groups is decreased at the telephoto end relative to the wide-angle end; the interval between the third and fourth lens groups is increased at the telephoto end relative to the wide-angle end; and the interval between the fourth and fifth lens groups is increased at the telephoto end relative to the wide-angle end, and at the time of focusing a near object point from a remote object point, the second lens group is moved.

摘要翻译： 在固定的总长度的变焦透镜中，在从广角端向望远端改变放大倍数时，第一透镜组在第二透镜组移动的同时被固定，第三和第四透镜组是 相对于广角端部位于长焦端的物体侧，使得第二透镜组和第三透镜组之间的间隔在望远端相对于广角端减小; 第三透镜组和第四透镜组之间的间隔在望远端相对于广角端增加; 并且第四透镜组和第五透镜组之间的间隔在望远端相对于广角端增加，并且在从远程对象点聚焦近物点时，第二透镜组移动。