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    • 13. 发明授权
    • Zoom lens system and electronic imaging apparatus that uses the same
    • 变焦镜头系统和使用它的电子成像装置
    • US07830614B2
    • 2010-11-09
    • US12412596
    • 2009-03-27
    • Toshiki NakamuraMasaru Eguchi
    • Toshiki NakamuraMasaru Eguchi
    • G02B15/14
    • G02B15/177
    • A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group. Upon zooming from the short focal length extremity to the long focal length extremity, each of the first to third lens groups move along the optical axis. The first lens group includes a negative first sub-lens element, a second sub-lens element having a weak negative refractive power and at least one aspherical surface, and a positive third sub-lens element. The zoom lens system satisfies the condition, 0.5
    • 变焦透镜系统包括负第一透镜组,正第二透镜组和正第三透镜组。 当从短焦距末端变焦到长焦距末端时,第一至第三透镜组中的每一个沿着光轴移动。 第一透镜组包括负的第一子透镜元件,具有弱的负折光力的第二子透镜元件和至少一个非球面,以及正的第三子透镜元件。 变焦透镜系统满足0.5 <(ra-rb)/(ra + rb)<1.2(1)的条件,其中ra表示第二子透镜元件的物体侧表面的曲率半径,rb表示 第二子透镜元件的图像侧表面的曲率半径。
    • 16. 发明授权
    • Zoom lens system
    • 变焦镜头系统
    • US08531768B2
    • 2013-09-10
    • US13415189
    • 2012-03-08
    • Tetsuya AbeMasaru EguchiToshiki Nakamura
    • Tetsuya AbeMasaru EguchiToshiki Nakamura
    • G02B15/14
    • G02B15/177
    • A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short to long focal length extremities, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. In at least part of the zooming range of the zoom lens system, the second sub-lens group and the third lens group each serves as a focusing lens group that is moved along the optical axis during a focusing operation.
    • 变焦透镜系统包括负第一透镜组,正第二透镜组和正第三透镜组,从物体侧开始,从短焦到长焦距四极放大时,第一透镜 组和第二透镜组减小,并且第二透镜组和第三透镜组之间的距离增加。 第二透镜组从物体侧起按顺序包括正的第一子透镜组和负的第二子透镜组。 在变焦透镜系统的变焦范围的至少一部分中,第二子透镜组和第三透镜组各自用作在聚焦操作期间沿着光轴移动的聚焦透镜组。
    • 17. 发明授权
    • Zoom lens system and electronic imaging apparatus
    • 变焦镜头系统和电子成像设备
    • US08498057B2
    • 2013-07-30
    • US13198042
    • 2011-08-04
    • Toshiki Nakamura
    • Toshiki Nakamura
    • G02B15/14
    • G02B15/177
    • A zoom lens system includes a negative first lens group, a positive second lens group and a positive third lens group, in that order from the object side. Upon zooming from the short to long focal length extremities, the distance between the first and second lens groups decreases, and the distance between the second and third lens groups increases. The first lens group includes a negative lens element and a positive lens element; and the second lens group includes a cemented lens including a positive lens element and a negative lens element, and a negative lens element, in that order from the object side. The following conditions are satisfied by the zoom lens system: 1.8
    • 变焦透镜系统包括从物体侧开始的顺序的负第一透镜组,正第二透镜组和正三透镜组。 当从短焦距长焦距变焦时,第一和第二透镜组之间的距离减小,并且第二和第三透镜组之间的距离增加。 第一透镜组包括负透镜元件和正透镜元件; 并且第二透镜组从物体侧依次包括具有正透镜元件和负透镜元件的胶合透镜以及负透镜元件。 变焦透镜系统满足以下条件:1.8
    • 19. 发明申请
    • ZOOM LENS SYSTEM
    • 变焦镜头系统
    • US20120243107A1
    • 2012-09-27
    • US13415189
    • 2012-03-08
    • Tetsuya AbeMasaru EguchiToshiki Nakamura
    • Tetsuya AbeMasaru EguchiToshiki Nakamura
    • G02B15/177
    • G02B15/177
    • A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short to long focal length extremities, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. In at least part of the zooming range of the zoom lens system, the second sub-lens group and the third lens group each serves as a focusing lens group that is moved along the optical axis during a focusing operation.
    • 变焦透镜系统包括负第一透镜组,正第二透镜组和正第三透镜组,从物体侧开始,从短焦到长焦距四极放大时,第一透镜 组和第二透镜组减小,并且第二透镜组和第三透镜组之间的距离增加。 第二透镜组从物体侧起按顺序包括正的第一子透镜组和负的第二子透镜组。 在变焦透镜系统的变焦范围的至少一部分中,第二子透镜组和第三透镜组各自用作在聚焦操作期间沿着光轴移动的聚焦透镜组。