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1. 发明申请

US20060132928A1 Taking optical system and image sensing apparatus 有权
标题翻译：采用光学系统和图像传感装置
公开(公告)号：US20060132928A1
公开(公告)日：2006-06-22
申请号：US11102051
申请日：2005-04-08
申请人： Toru Nakatani , Mamoru Terada , Kenshi Nabeta
发明人： Toru Nakatani , Mamoru Terada , Kenshi Nabeta
IPC分类号： G02B15/14
CPC分类号： G02B15/173
摘要： The present invention provides a compact, high-performance, and easy-to-manufacture taking optical system that offers an extremely high zoom ratio. The taking optical system includes, from the subject side, a first lens group having a positive optical power, a second lens group having a negative optical power, a third lens group having a positive optical power, and a fourth lens group having a positive optical power. The taking optical system achieves zooming by the movements of the first to fourth lens groups and focusing by the movement of the fourth lens group. The taking optical system fulfills the following conditions: 0.05≦f3/f4≦0.95 and 7.0≦f1/fw≦20.0, where f1, f3, and f4 represent the focal lengths of the first, third, and fourth lens groups, respectively, and fw represents the focal length of the entire taking optical system at the wide-angle end thereof.
摘要翻译：本发明提供了一种紧凑，高性能，易于制造的拍摄光学系统，其提供了非常高的变焦比。拍摄光学系统包括从被摄体侧具有正光焦度的第一透镜组，具有负光焦度的第二透镜组，具有正光焦度的第三透镜组，以及具有正光学功能的第四透镜组功率。拍摄光学系统通过第一至第四透镜组的运动实现变焦，并通过第四透镜组的移动进行聚焦。拍摄光学系统满足以下条件：0.05 <= f 3 / f 4 <= 0.95和7.0 <= f 1 /fw<=20.0，其中f 1，f 3和f 4表示第一，第三透镜组和第四透镜组，fw表示整个拍摄光学系统在其广角端的焦距。

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