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    • 1. 发明授权
    • Zoom lens and image pickup apparatus using the same
    • 变焦镜头和使用其的摄像设备
    • US08730587B2
    • 2014-05-20
    • US13488579
    • 2012-06-05
    • Ryu OtaShinichi Mihara
    • Ryu OtaShinichi Mihara
    • G02B15/14
    • G02B15/173
    • A zoom lens includes in order from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive, and a last lens group having a positive refractive index, and at the time of zooming from the wide angle end to the telephoto end, the first lens group is fixed, the second lens group moves toward a side of an image plane, the third lens group is fixed, and the fourth lens group moves, and at the time of focusing, the fourth lens group moves. The zoom lens satisfies the following conditional expression (101) 0.20
    • 变焦透镜从物体侧依次包括具有正折光力的第一透镜组,具有负折射光焦度的第二透镜组,具有正折光力的第三透镜组,具有正折光力的第四透镜组, 以及具有正折射率的最后一个透镜组,并且在从广角端到望远端的变焦时,第一透镜组被固定,第二透镜组朝向图像平面侧移动,第三透镜 组固定,第四透镜组移动,并且在聚焦时第四透镜组移动。 变焦透镜满足以下条件式(101)0.20