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    • 32. 发明授权
    • Zoom lens system
    • 变焦镜头系统
    • US06369955B1
    • 2002-04-09
    • US09534307
    • 2000-03-23
    • Takashi EnomotoHiroshi NomuraTakayuki ItoShinichiro Ishii
    • Takashi EnomotoHiroshi NomuraTakayuki ItoShinichiro Ishii
    • G02B1514
    • G03B3/00G02B7/102
    • A zoom lens system includes a plurality of lens groups being relatively moveable in order to vary the focal length, and at least one lens group is arranged to be a switching lens group which includes two or more sub-lens groups, and in which one sub-lens group is made moveable, along the optical axis, with respect to the other sub-lens group. In the first focal-length range of the zooming range of the zoom lens system, the moveable sub-lens group and the other sub-lens group maintain the first distance; and in the second focal-length range which covers the first focal-length range and a range different therefrom, the moveable sub-lens group and the other sub-lens group maintain the second distance which is different from the first one.
    • 变焦透镜系统包括多个可相对移动的透镜组以改变焦距,并且至少一个透镜组被布置为包括两个或更多个子透镜组的切换透镜组,并且其中一个子 光学组相对于另一个子透镜组沿光轴可移动。 在变焦透镜系统的变焦范围的第一焦距范围内,可移动子透镜组和另一副透镜组保持第一距离; 并且在覆盖第一焦距范围和与其不同的范围的第二焦距范围中,可移动子透镜组和另一副透镜组保持与第一距离不同的第二距离。
    • 34. 发明授权
    • Zoom lens system
    • 变焦镜头系统
    • US5930052A
    • 1999-07-27
    • US116370
    • 1998-07-16
    • Takashi EnomotoTakayuki Ito
    • Takashi EnomotoTakayuki Ito
    • G02B13/18G02B15/16G02B15/167G02B15/14
    • G02B15/161
    • A zoom lens system comprises a first lens group of positive power and a second lens group of negative power. The zoom lens system is arranged to perform a zooming operation by varying a distance between the first lens group and the second lens group. Furthermore, the first lens group comprises a front sub lens group of negative poser and a rear sub lens group of positive power. Still further, the front sub lens group comprises a first single lens element of negative power and a second single lens element having an aspherical surface on which the radius of curvature becomes larger in the off-axis region, and the rear sub lens group of the first lens group comprises a cemented lens having a positive lens element and a negative lens element. Moreover, the zoom lens system satisfies various conditions.
    • 变焦透镜系统包括正功率的第一透镜组和负功率的第二透镜组。 变焦透镜系统被布置成通过改变第一透镜组和第二透镜组之间的距离来执行变焦操作。 此外,第一透镜组包括正偏压的前副透镜组和正功率的后副透镜组。 此外,前副透镜组包括负功率的第一单透镜元件和具有非球面的第二单透镜元件,偏轴半径的曲率半径在偏轴区域变大,并且后副透镜组 第一透镜组包括具有正透镜元件和负透镜元件的胶合透镜。 此外,变焦透镜系统满足各种条件。