发明授权
- 专利标题: Zoom lens system, imaging device and camera
- 专利标题(中): 变焦镜头系统,成像设备和相机
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申请号: US12785193申请日: 2010-05-21
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公开(公告)号: US07948685B2公开(公告)日: 2011-05-24
- 发明人: Keiki Yoshitsugu , Katsu Yamada , Yoshito Miyatake , Kazuhiko Ishimaru
- 申请人: Keiki Yoshitsugu , Katsu Yamada , Yoshito Miyatake , Kazuhiko Ishimaru
- 申请人地址: JP Osaka
- 专利权人: Panasonic Corporation
- 当前专利权人: Panasonic Corporation
- 当前专利权人地址: JP Osaka
- 代理机构: Pearne & Gordon LLP
- 优先权: JP2007-142632 20070529; JP2007-142633 20070529; JP2007-142634 20070529
- 主分类号: G02B15/14
- IPC分类号: G02B15/14
摘要:
A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a cemented lens element fabricated by two lens elements having optical power of mutually different signs and one single lens element; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0 35, αiW is an incident angle of a principal ray to an image sensor at a maximum image height at a wide-angle limit, n11 is a refractive index of the first lens element to the d-line, ωW is a half view angle at a wide-angle limit, and fT and fW are focal lengths of the entire system at a telephoto limit and a wide-angle limit, respectively) are satisfied.
公开/授权文献
- US20100226019A1 ZOOM LENS SYSTEM, IMAGING DEVICE AND CAMERA 公开/授权日:2010-09-09