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    • 52. 发明授权
    • Parfocal low-magnification microscope objective lens systems
    • Parfocal低倍数显微镜物镜系统
    • US4027951A
    • 1977-06-07
    • US621347
    • 1975-10-10
    • Ikuo MoriYoshiyuki Shimizu
    • Ikuo MoriYoshiyuki Shimizu
    • G02B21/02
    • G02B21/02
    • A parfocal low-magnification microscope objective lens system comprises, in succession from the object side, a positive first lens member, a negative second lens member and a positive third lens member. The first lens member has its concave surface facing the object; the second lens member includes at least one negative meniscus lens component with its concave surface facing the object; and the third lens member includes a positive lens component with that surface thereof sharper in radius of curvature facing the image plane side. The lens system satisfies the following four conditions: d.sub.A .vertline.f.sub.B .vertline.; where f.sub.A and f.sub.B are the focal lengths of the first and the second lens member, respectively, d.sub.A is the distance from the rear principal plane of the first lens member to the front principal plane of the second lens member, and d.sub.B is the distance from the rear principal plane of the second lens member to the front principal plane of the third lens member.
    • 对焦低倍率显微镜物镜系统,从物体侧依次包括正的第一透镜部件,负的第二透镜部件和正的第三透镜部件。 第一透镜构件具有面向物体的凹面; 第二透镜构件包括至少一个其凹面朝向物体的负弯月形透镜部件; 并且第三透镜构件包括正透镜部件,该正透镜部件的表面的面向像面侧的曲率半径更锐。 透镜系统满足以下四个条件:dA | fB|; 其中fA和fB分别是第一和第二透镜构件的焦距,dA是从第一透镜构件的后主平面到第二透镜构件的前主平面的距离,dB是与 第二透镜构件的后主面朝向第三透镜构件的前主面。