Compact imaging lens having four single lenses
    1.
    发明公开
    Compact imaging lens having four single lenses 有权
    Kompaktes Objektiv mit vier Einzellinsen

    公开(公告)号:EP2437093A1

    公开(公告)日:2012-04-04

    申请号:EP11178254.6

    申请日:2011-08-22

    申请人: Sony Corporation

    发明人: Takei, Shoji

    IPC分类号: G02B13/00 G02B9/16 G02B13/22

    CPC分类号: G02B13/004 G02B9/16 G02B13/22

    摘要: An imaging lens includes an aperture stop, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a fourth lens having negative refractive power. Both surfaces of the first lens, both surfaces of the second lens, both surfaces of the third lens, and both surfaces of the fourth lens are formed as aspheric surfaces. The following condition expression (1), condition expression (2), and condition expression (3) are satisfied. - 1.09 ≤ f ⁢ 2 / f ≤ - 0.81 - 1.62 ≤ f ⁢ 2 / f ⁢ 1 ≤ - 1.42 0.65 ≤ f ⁢ 3 / f ≤ 0.97
    in which
    f1: the focal length of the first lens
    f2: the focal length of the second lens
    f3: the focal length of the third lens
    f: the focal length of the lens whole system

    摘要翻译: 成像透镜包括孔径光阑,具有正屈光力的第一透镜,具有负屈光力的第二透镜,具有正屈光力的第三透镜和具有负屈光力的第四透镜。 第一透镜的两个表面,第二透镜的两个表面,第三透镜​​的两个表面和第四透镜的两个表面都形成为非球面。 满足以下条件表达式(1),条件表达式(2)和条件表达式(3)。 - 1.09‰¤¢¢2 / f‰ - 0.81 - 1.62‰¤f ¢2 / f ¢1‰¤ - 1.42 0.65‰¤f ¢3 / f‰¤0.97其中f1:焦距 第一透镜f2的焦距:第二透镜的焦距f3:第三透镜的焦距f:透镜整体系统的焦距