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    • 2. 发明申请
    • ZOOM LENS, OPTICAL APPARATUS AND METHOD FOR MANUFACTURING ZOOM LENS
    • 变焦镜头,光学装置和制造变焦镜头的方法
    • US20120188653A1
    • 2012-07-26
    • US13358359
    • 2012-01-25
    • Toshiyuki SHIMADA
    • Toshiyuki SHIMADA
    • G02B15/14
    • G02B15/177G02B13/18
    • A zoom lens ZL having, in order from an object: a first lens group G1 having negative refractive power; a second lens group G2 having positive refractive power; and a third lens group G3 having positive refractive power, wherein, upon zooming from the wide-angle end state to the telephoto end state, at least the first lens group G1 and the second lens group G2 move along the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases, and the distance between the second lens group G2 and the third lens group G3 increases, the lens closest to the object in the second lens group G2 is a positive lens, and the object side lens surface of this positive lens is an aspherical surface of which radius of curvature increases in a direction from the optical axis to the periphery of the lens.
    • 具有从物体的顺序的变焦透镜ZL:具有负屈光力的第一透镜组G1; 具有正折射力的第二透镜组G2; 以及具有正折射力的第三透镜组G3,其中,在从广角端状态变焦到远摄端状态时,至少第一透镜组G1和第二透镜组G2沿着光轴移动,使得距离 第一透镜组G1和第二透镜组G2之间的距离减小,并且第二透镜组G2和第三透镜组G3之间的距离增加,最靠近第二透镜组G2中的物体的透镜为正透镜, 该正透镜的物体侧透镜表面是在从光轴到透镜周边的方向上的曲率半径的非球面。