公开(公告)号：US07423819B1

公开(公告)日：2008-09-09

申请号：US11969661

申请日：2008-01-04

申请人： Fu-Ming Chuang ,  Yi-Hao Kang ,  Hsin-Te Chen ,  Yun-Chin Liang

发明人： Fu-Ming Chuang ,  Yi-Hao Kang ,  Hsin-Te Chen ,  Yun-Chin Liang

IPC分类号： G02B13/04

CPC分类号： G02B7/04 ,  G02B13/18

摘要： A fixed-focus lens including a first lens group, a second lens group, and a third lens group is provided. The first lens group has a negative refractive power, includes a plurality of lenses, and is disposed between an object side and an image side. The lenses of the first lens group include at least one aspheric lens. The second lens group is disposed between the first lens group and the image side and has a positive refractive power. The third lens group is disposed between the second lens group and the image side and has a positive refractive power. The third lens group includes a first triple cemented lens and a second triple cemented lens arranged from the object side to the image side in sequence.

摘要翻译： 提供了包括第一透镜组，第二透镜组和第三透镜组的固定焦点透镜。 第一透镜组具有负屈光力，包括多个透镜，并且设置在物体侧和像侧之间。 第一透镜组的透镜包括至少一个非球面透镜。 第二透镜组设置在第一透镜组和像侧之间并且具有正折光力。 第三透镜组设置在第二透镜组和像侧之间并且具有正折光力。 第三透镜组包括从物体侧到像侧依次布置的第一三重胶合透镜和第二三重胶合透镜。