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    • 8. 发明授权
    • Zoom lens
    • 变焦镜头
    • US08699145B2
    • 2014-04-15
    • US13455479
    • 2012-04-25
    • Yoji KubotaKenichi KubotaHitoshi Hirano
    • Yoji KubotaKenichi KubotaHitoshi Hirano
    • G02B15/14
    • G02B15/173
    • A zoom lens includes a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group includes a first lens that has positive refractive power, a second lens that has negative refractive power, and a prism. The second lens group includes a third lens that has positive refractive power and a fourth lens that has negative refractive power. The third lens group includes a stop, a fifth lens that has positive refractive power, and a sixth lens that has negative refractive power. The fourth lens group includes a seventh lens that has positive refractive power. Upon changing magnification from a wide-angle end to a telephoto end, the first and fourth lens groups are fixed, the second lens group first moves toward an image plane side and then moves toward an object side, and the third lens group linearly moves toward the object side.
    • 变焦镜头包括第一透镜组,第二透镜组,第三透镜​​组和第四透镜组。 第一透镜组包括具有正屈光力的第一透镜,具有负屈光力的第二透镜和棱镜。 第二透镜组包括具有正折光力的第三透镜和具有负屈光力的第四透镜。 第三透镜组包括具有正折光力的光阑,第五透镜和具有负屈光力的第六透镜。 第四透镜组包括具有正屈光力的第七透镜。 在从广角端到望远端的倍率变化时,第一透镜组和第四透镜组是固定的,第二透镜组首先朝向像平面侧移动,然后朝向物体侧移动,并且第三透镜组线性移动朝向 物体侧。
    • 9. 发明申请
    • IMAGING LENS
    • 成像镜头
    • US20120113533A1
    • 2012-05-10
    • US13289452
    • 2011-11-04
    • Yoji KUBOTAKenichi KubotaHitoshi Hirano
    • Yoji KUBOTAKenichi KubotaHitoshi Hirano
    • G02B9/34
    • G02B9/58G02B3/04G02B13/004
    • An imaging lens includes a first lens group having a first lens that directs a concave surface to an image plane side and is negative; a second lens group having a second lens that directs a concave surface to an object side and is positive; an aperture; a third lens group having a third lens that is positive; and a fourth lens group having a joined lens that is composed of a fourth lens that is positive and a fifth lens that is negative. In the configuration, when the whole lens system has a focal length f and a composite focal length of the first lens group to the third lens group is Fa, the imaging lens satisfies the following relation: 0.3
    • 成像透镜包括:第一透镜组,具有将凹面指向像面侧的第一透镜,并且为负; 第二透镜组,具有将凹面指向物侧并具有正的第二透镜; 孔径 第三透镜组,具有正的第三透镜; 以及第四透镜组,具有由正的第四透镜和为负的第五透镜构成的接合透镜。 在该结构中,当整个透镜系统具有焦距f并且第一透镜组与第三透镜组的合成焦距为Fa时,成像透镜满足以下关系:0.3