发明申请
- 专利标题: INTERNAL FOCUSING LENS
- 专利标题(中): 内部聚焦镜头
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申请号: US13341055申请日: 2011-12-30
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公开(公告)号: US20120194924A1公开(公告)日: 2012-08-02
- 发明人: Takahiko SAKAI , Masaharu HOSOI
- 申请人: Takahiko SAKAI , Masaharu HOSOI
- 专利权人: TAMRON CO., LTD.,SONY CORPORATION
- 当前专利权人: TAMRON CO., LTD.,SONY CORPORATION
- 优先权: JP2011-018196 20110131
- 主分类号: G02B9/14
- IPC分类号: G02B9/14
摘要:
An internal focusing lens includes sequentially from an object side, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power. During focusing, the second lens group is moved along the optical axis and, the first lens group and the third lens group are fixed. The internal focusing lens satisfies a conditional expression (1) 0.31
公开/授权文献
- US08605363B2 Internal focusing lens 公开/授权日:2013-12-10