发明申请
- 专利标题: Zoom lens
- 专利标题(中): 变焦镜头
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申请号: US12661055申请日: 2010-03-09
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公开(公告)号: US20100238563A1公开(公告)日: 2010-09-23
- 发明人: Toru Miyajima
- 申请人: Toru Miyajima
- 优先权: JP2009-064692 20090317
- 主分类号: G02B15/14
- IPC分类号: G02B15/14
摘要:
A zoom lens includes, from an object side in the following order: a first lens group that has a positive refractive power; a second lens group that has a negative refractive power; a third lens group that has a positive refractive power; and a fourth lens group that has a positive refractive power, wherein: when magnification is changed from a wide angle end to a telephoto end, the lens groups each move so as to increase the distance between the first and second lens groups and to decrease the distance between the second and third lens groups and the distance between the third and fourth lens groups; and the following conditional expressions (1) and (2) are satisfied: 5.5
公开/授权文献
- US08218245B2 Zoom lens 公开/授权日:2012-07-10
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