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    • 34. 发明授权
    • Zoom lens
    • 变焦镜头
    • US5576890A
    • 1996-11-19
    • US440980
    • 1995-05-15
    • Tsunefumi TanakaHideki OgawaHiroshi Endo
    • Tsunefumi TanakaHideki OgawaHiroshi Endo
    • G02B15/177G02B15/14
    • G02B15/177
    • A zoom lens is disclosed comprising, from front to rear, a first lens unit of negative refractive power, a second lens unit of positive refractive power, a third lens unit of negative refractive power and a fourth lens unit of positive refractive power, zooming from a wide-angle end to a telephoto end being performed by moving at least the first, second and fourth lens units in such a way that an air separation between the first and second lens units decreases, an air separation between the second and third lens units increases and an air separation between the third and fourth lens units decreases, wherein the form and the construction and arrangement of the members of the lens units and, if an aspheric surface is in use, its shape, are appropriately determined.
    • 公开了一种变焦透镜,包括从前到后的具有负屈光力的第一透镜单元,正屈光力的第二透镜单元,负折射光焦度的第三透镜单元和正折射光焦度的第四透镜单元, 通过至少移动第一透镜单元和第二透镜单元,使第一和第二透镜单元之间的空气间隔减小,第二透镜单元和第三透镜单元之间的空气分离, 增加并且第三和第四透镜单元之间的空气分离减小,其中透镜单元的构件的形状和结构和布置以及如果非球面表面在使用中,其形状被适当地确定。
    • 35. 发明授权
    • Zoom lens
    • 变焦镜头
    • US5241421A
    • 1993-08-31
    • US647495
    • 1991-01-29
    • Hiroshi EndoHideki Ogawa
    • Hiroshi EndoHideki Ogawa
    • G02B15/173
    • G02B15/173
    • A zoom lens is disclosed comprising a front lens group having a positive lens unit, a negative lens unit and a positive lens unit and whose overall refractive power is positive, and a rear lens group having a positive lens unit and a negative lens unit and whose overall refractive power is negative, wherein zooming is performed by varying all the lens separations between the successive two of the lens units and focusing is performed by varying at least the lens separation between the positive lens unit and the negative lens unit of the rear lens group.
    • 公开了一种变焦透镜,包括具有正透镜单元,负透镜单元和正透镜单元并且其总折射力为正的前透镜组,以及具有正透镜单元和负透镜单元的后透镜组, 总的屈光力是负的,其中通过改变连续的两个透镜单元之间的所有透镜间隔来执行变焦,并且通过至少改变后透镜组的正透镜单元和负透镜单元之间的透镜间隔来执行聚焦 。