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    • 77. 发明授权
    • Zoom lens system
    • 变焦镜头系统
    • US4413887A
    • 1983-11-08
    • US294824
    • 1981-08-21
    • Tadashi Kimura
    • Tadashi Kimura
    • G02B15/16G02B15/14
    • G02B15/14
    • A zoom lens system comprising a front lens group consisting of a first positive lens component, a second negative meniscus lens component having a convex surface on the image side, a third negative lens component and a fourth positive lens component, and a rear lens group consisting of a fifth positive lens component, a sixth positive lens component, a seventh negative lens component and a eighth positive lens component. The zoom lens system is so adapted as to perform zooming operation by varying the airspace reserved between the front and rear lens groups, and has sufficient wide-angle effect and a large zooming ratio in addition to aberrations corrected with good balance.
    • 一种变焦透镜系统,包括由第一正透镜部件,在图像侧具有凸面的第二负弯月形透镜部件,第三负透镜部件和第四正透镜部件以及后透镜组构成的前透镜组, 第五正透镜部件,第六正透镜部件,第七负透镜部件和第八正透镜部件。 变焦透镜系统适于通过改变保留在前后透镜组之间的空间进行变焦操作,并且除了以良好的平衡校正的像差之外,还具有足够的广角效果和大的变焦比。
    • 80. 发明授权
    • Finder optical system for single lens reflex photographic cameras
    • 用于单镜头反光相机的Finder光学系统
    • US4131355A
    • 1978-12-26
    • US790752
    • 1977-04-25
    • Tadashi KimuraFumitaka Watanabe
    • Tadashi KimuraFumitaka Watanabe
    • G03B17/20G03B19/12G03B13/02
    • G03B19/12G03B17/20
    • A finder optical system for single-lens reflex photographic cameras wherein an even number at least four of small reflecting surfaces are arranged in front of a pentagonal prism of a single-lens reflex photographic camera in such a way that an image of optical information such as graduations on diaphragm dial or shutter speed dial is reflected consecutively by said small reflecting surfaces, whereafter said image of optical information is projected around the field of view in a finder, said finder optical system being capable of projecting an image of optical information free from difference in dioptor at any desired position around said field of view in the finder by changing locations and/or relative tilting angles of said small reflecting surfaces.
    • 用于单镜头反光照相机的取景器光学系统,其中偶数数量的小反射表面布置在单镜头反光照相机的五边形棱镜的前面,使得诸如 光阑拨盘或快门速度拨盘上的刻度由所述小反射表面连续反射,此后所述光学信息图像在取景器中围绕视场投影,所述取景器光学系统能够投射光学信息的图像, 通过改变所述小反射表面的位置和/或相对倾斜角度,在取景器中的所述视场周围的任何期望位置处。