发明申请
- 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）： 更轻的光学系统，兼容光学系统的光学仪器和制造光学系统的方法
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申请号： US12342315申请日： 2008-12-23
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公开(公告)号： US20090161227A1公开(公告)日： 2009-06-25
- 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
- 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: vp>30.0, where vp is an Abbe number of the positive lens.
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