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    • 67. 发明授权
    • Variable magnification viewfinder optical system
    • 可变倍率取景器光学系统
    • US5086353A
    • 1992-02-04
    • US616698
    • 1990-11-20
    • Hiromu MukaiKagumi KojiyaKohtaro HayashiTaro Shibuya
    • Hiromu MukaiKagumi KojiyaKohtaro HayashiTaro Shibuya
    • G03B13/12G02B15/16G02B23/14G02B25/00
    • G02B23/14
    • The present invention provides a variable magnification viewfinder optical system, comprising from the object side: objective lens group of a positive refractive power, including a first lens unit of a negative refractive power and a second lens unit of a positive refractive power, said first and second lens units being shiftable along the optical axis of the optical system for changing the magnification of the optical system; condenser lens group of a positive refractive power; and eyepiece lens group of a negative refractive power; wherein the objective lens group forms a real image of an object and the real image can be observed through the eyepiece lens group; and wherein the optical system fulfills the following conditions;-0.09/mm
    • 本发明提供了一种可变放大倍率取景器光学系统,包括:物体侧:具有正屈光力的第一透镜单元和正屈光力的第二透镜单元的正屈光力的物镜组,所述第一透镜组和 第二透镜单元可沿光学系统的光轴移动,用于改变光学系​​统的放大倍率; 聚光透镜组正屈光力; 和目镜透镜组的负屈光力; 其中所述物镜组形成物体的真实图像,并且可以通过所述目镜透镜组观察所述实际图像; 并且其中所述光学系统满足以下条件; -0.09 / mm <1 / f1 <-0.03 / mm 0.04 / mm <1 / f2 <0.11 / mm -0.1 / mm