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    • 7. 发明授权
    • Compact objective lens
    • 紧凑型物镜
    • US5327291A
    • 1994-07-05
    • US860401
    • 1992-03-30
    • James G. BakerWilliam T. PlummerJon Van Tassell
    • James G. BakerWilliam T. PlummerJon Van Tassell
    • G02B9/08G02B13/18G02B3/02G02B9/04
    • G02B9/08G02B13/18
    • A lens system for a folding reflex camera is provided. The system includes: (a) a first group on the object side of the system's stop which (i) has a positive dioptric power, (ii) includes an aspheric surface, and (iii) has a concave surface adjacent to the stop; and (b) a second group on the image side of the stop consisting of either a single positive component or the combination of a single positive component and one or more focusing elements. The system includes at least two elements made of materials differing in dispersive powers where at least one of the elements is of plastic. The system can comprise just two plastic elements and even with such a simple configuration achieves excellent optical performance including a relatively flat field, relatively low distortion, and at least partial correction for lateral chromatic aberration.
    • 提供了一种用于折叠式反光相机的透镜系统。 该系统包括:(a)系统停止物体一侧的第一组,其中(i)具有正的度数,(ii)包括非球面,和(iii)具有与停止点相邻的凹面; 和(b)停止在​​图像侧的第二组由单个正分量或单个正分量和一个或多个聚焦元件的组合组成。 该系统包括由分散能力不同的材料制成的至少两个元件,其中至少一个元件是塑料的。 该系统可以仅包括两个塑料元件,并且即使具有这样简单的配置,实现了优异的光学性能,包括相对平坦的场,相对低的失真以及横向色差的至少部分校正。