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    • 10. 发明授权
    • Zoom lens and optical apparatus equipped therewith
    • 变焦镜头和配备其的光学仪器
    • US08040615B2
    • 2011-10-18
    • US12528448
    • 2008-02-08
    • Susumu Sato
    • Susumu Sato
    • G02B15/14
    • G02B15/173G02B27/646G03B5/00G03B17/02
    • A zoom lens is provided with comprising a plurality of lens groups including, in order from an object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3, and a fourth lens group G4, upon zooming from a wide-angle end state W to a telephoto end state T, a distance between the first lens group G1 and the second lens group G2 increasing, a distance between the second lens group G2 and the third lens group G3 decreasing, and the most image side lens group among the plurality of lens groups moving along an optical axis with a trajectory having convex shape facing the object side, and given conditional expressions being satisfied, thereby excellently correcting chromatic aberration in a farther away shooting range, capable of having excellent optical performance with being compact.
    • 变焦透镜设置有多个透镜组,其包括从物体起依次具有正折光力的第一透镜组G1,具有负折光力的第二透镜组G2,第三透镜​​组G3和第四透镜 组G4在从广角端状态W变焦到望远端状态T时,第一透镜组G1和第二透镜组G2之间的距离增加,第二透镜组G2和第三透镜组G3之间的距离 减少了多个透镜组中的最大像侧透镜组,并且具有面向物体侧的具有凸形的轨迹沿着光轴移动,并且给出条件表达式,从而在更远的拍摄范围内良好地校正色像差, 能够具有优异的光学性能而紧凑。