发明授权
US07839577B2 Zoom optical system, optical instrument incorporating the zoom optical system, and method of manufacturing the zoom optical system
有权
变焦光学系统，包含变焦光学系统的光学仪器以及制造变焦光学系统的方法
- 专利标题： Zoom optical system, optical instrument incorporating the zoom optical system, and method of manufacturing the zoom optical system
- 专利标题（中）： 变焦光学系统，包含变焦光学系统的光学仪器以及制造变焦光学系统的方法
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申请号： US12342315申请日： 2008-12-23
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公开(公告)号： US07839577B2公开(公告)日： 2010-11-23
- 发明人: Hiroshi Yamamoto , Tomoki Ito , Satoshi Yamaguchi , Atsushi Shibayama
- 申请人： Hiroshi Yamamoto , Tomoki Ito , Satoshi Yamaguchi , Atsushi Shibayama
- 申请人地址： JP Tokyo
- 专利权人： Nikon Corporation
- 当前专利权人： Nikon Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Miles & Stockbridge P.C.
- 优先权： JP2007-331480 20071225; JP2007-331481 20071225
- 主分类号： G02B15/14
- IPC分类号： G02B15/14
摘要：
A zoom optical system has a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; a fourth lens group having a negative refracting power; and a fifth lens group having a positive refracting power, in the order from the object side. The fourth lens group is composed of a cemented lens of a negative lens and a positive lens in the order from the object side, and a condition of the following expression is satisfied: νp>30.0, where νp is an Abbe number of the positive lens.
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