发明名称 Zoom lens and image pickup apparatus having the same
摘要 A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a rear lens unit including one or more lens units and having an overall positive refractive power. In the zoom lens, the third lens unit includes a first subunit having a positive refractive power and including one lens component having a positive refractive power, an aperture stop, and a second subunit including a negative lens. In the third lens unit of the zoom lens, a focal length of each of the first subunit and the second subunit is appropriately set.
申请公布号 US7589908(B2) 申请公布日期 2009.09.15
申请号 US20080324131 申请日期 2008.11.26
申请人 CANON KABUSHIKI KAISHA 发明人 KIMURA TOMONORI
分类号 G02B15/14 主分类号 G02B15/14
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