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    • 9. 发明授权
    • Zoom lens system and image pickup apparatus including the same
    • 变焦透镜系统和包括其的摄像装置
    • US07982971B2
    • 2011-07-19
    • US12845304
    • 2010-07-28
    • Tomoyuki Nakamura
    • Tomoyuki Nakamura
    • G02B15/14
    • G02B15/177G02B27/0062
    • A zoom lens system includes, in order of from an object side to an image side: a first lens unit which does not move for zooming; a second lens unit moving during zooming; a third lens unit moving during zooming; and a fourth lens unit which does not move for zooming. The first lens unit includes a negative lens, a positive lens, a positive lens, and a positive lens, and when an Abbe number ν and a partial dispersion ratio θ of a material of the negative lens are denoted respectively by νn and θn, an average value of Abbe numbers ν and an average value of partial dispersion ratios θ of materials of the positive lenses are denoted respectively by νpa and θpa, and a refractive power of the negative lens is denoted by φn, the following expressions are satisfied: −1.75×10−3
    • 变焦透镜系统包括从物体侧到像侧的顺序:第一透镜单元,其不移动用于变焦; 在变焦期间移动的第二透镜单元; 在变焦期间移动的第三透镜单元; 以及不能进行变焦的第四透镜单元。 第一透镜单元包括负透镜,正透镜,正透镜和正透镜,并且当阿贝数&ngr; 和部分色散比率; 负透镜的材料分别由&ngr; n和&thetas表示; n,阿贝数的平均值&ngr; 和部分色散比的平均值; 正透镜的材料分别由&ngr; pa和&amp; t; pa表示,负透镜的屈光力由&phgr; n表示,满足以下表达式:-1.75×10-3 <(&Thetas; pa - &thetas; n)/(&ngr; pa-&ngr; n); 和9.1×10-3(1 / mm)<|&phgr; n |。