发明授权
- 专利标题： Zoom lens and an imaging apparatus incorporating the same
- 专利标题（中）： 变焦镜头和包含该变焦镜头的成像装置
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申请号： US12456460申请日： 2009-06-16
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公开(公告)号： US07830613B2公开(公告)日： 2010-11-09
- 发明人: Keisuke Ichikawa
- 申请人： Keisuke Ichikawa
- 申请人地址： JP Tokyo
- 专利权人： Olympus Imaging Corp.
- 当前专利权人： Olympus Imaging Corp.
- 当前专利权人地址： JP Tokyo
- 代理机构： Kenyon & Kenyon LLP
- 优先权： JP2008-161487 20080620; JP2009-004334 20090113
- 主分类号： G02B5/14
- IPC分类号： G02B5/14
摘要：
The first lens group comprises a positive lens and a negative lens, and the total number of lenses in the first lens group is 2. The second lens group consists of, in order from the object side, a front unit of negative refracting power and a rear unit of positive refracting power. The third lens group consists of, in order from the object side, a front unit of positive refracting power and a rear unit of negative refracting power. The fourth lens group comprises a positive lens component, and the total number of lens components in the fourth lens group is 1. The front unit of the second lens group comprises a negative lens component, and the total number of lens components in the front unit of the second lens group is 1. The rear unit of the second lens group comprises, in order from the object side to the image side, a negative lens and a positive lens, and the total number of lenses in the rear unit of the second lens group is 2. The negative lens component in the front unit of the second lens group and the negative lens in the rear unit of the second lens group satisfy the following condition (1A): 2.9
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