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    • 2. 发明授权
    • Zoom lens system
    • 变焦镜头系统
    • US06785055B2
    • 2004-08-31
    • US10147016
    • 2002-05-16
    • Jun NishikawaTomoko Nakagawa
    • Jun NishikawaTomoko Nakagawa
    • G02B1514
    • G02B15/177
    • A zoom lens system has, in order from an enlargement side, a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having positive optical power, a fourth lens unit having negative optical power, including an aperture stop, a fifth lens unit having positive or negative optical power, and a sixth lens unit having positive optical power. Zooming is achieved by varying the first to fifth variable distances between the lens units. The third and fifth lens units move from the enlargement side to the reduction side during zooming from the telephoto end to the wide-angle end. The zoom lens system is substantially telecentric toward the reduction side.
    • 变焦透镜系统从放大侧依次具有具有负光焦度的第一透镜单元,具有正光焦度的第二透镜单元,具有正光焦度的第三透镜单元,具有负光焦度的第四透镜单元,包括 孔径光阑,具有正或负光焦度的第五透镜单元和具有正光焦度的第六透镜单元。 通过改变透镜单元之间的第一至第五可变距离来实现变焦。 第三和第五透镜单元在从望远端到广角端的变焦期间从放大侧移动到缩小侧。 变焦透镜系统基本上朝向减速侧的远心。