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    • 45. 发明授权
    • Vari-focal objective lens of short total length
    • 总焦距短焦点物镜
    • US4679913A
    • 1987-07-14
    • US750698
    • 1985-06-28
    • Yasuhisa SatoYasuyuki YamadaHiroki NakayamaKouji Oizumu
    • Yasuhisa SatoYasuyuki YamadaHiroki NakayamaKouji Oizumu
    • G02B13/02G02B13/18G02B15/16G02B15/00
    • G02B15/161
    • An objective lens comprising a front lens unit and a rear lens unit with the separation between the two lens units being varied to vary the focal length of the entire system, wherein the front lens unit has a positive refractive power and consists of a positive lens of strong convex curvature toward the front, a negative doublet lens of a negative lens and a positive lens cemented together in this order from the front, and a positive lens sub-unit, and the rear lens unit has a negative refractive power and comprises a positive lens and a negative lens. Particularly the double lens is so designed that the comatic aberration in the intermediate zone of the image frame is stabilized throughout the entire range of variation of the focal length, and the halo in the intermediate zone in the telephoto end is well corrected.
    • 一种包括前透镜单元和后透镜单元的物镜,其中两个透镜单元之间的间隔被改变以改变整个系统的焦距,其中前透镜单元具有正折射光焦度,并且由正透镜单元 前凸的强凸曲率,负透镜的负双折射透镜和正透镜从前面依次粘接在一起,正透镜子单元和后透镜单元具有负折光力并且包括正 透镜和负透镜。 特别地,双透镜被设计成使得图像帧的中间区域中的彗形像差在焦距变化的整个变化范围内是稳定的,并且远摄端的中间区域中的晕圈被很好地校正。
    • 49. 发明授权
    • Display device for view finder
    • 显示设备的取景器
    • US4530583A
    • 1985-07-23
    • US471720
    • 1983-03-03
    • Yasuyuki Yamada
    • Yasuyuki Yamada
    • G03B13/08G03B17/20
    • G03B17/20G03B13/08
    • A display device in a view finder of a camera includes an illumination light source for illuminating the display portion and an illumination light leading body. The body has a reflecting surface and two permeable surfaces having such a refracting force such that the light emitting portion of the illumination light source is almost conjugate with the position of the pupil while observing the image in the view finder. The apparatus is arranged in such a manner that the illumination light beam is incident upon the one permeable surface of the illumination light leading body and goes out at the other permeable surface so as to illuminate the display portion. Accordingly, the display portion is observed together with the image in the view finder.
    • 照相机的取景器中的显示装置包括用于照亮显示部分的照明光源和照明光引导体。 主体具有反射面和两个具有这种折射力的透光表面,使得照明光源的发光部分在观察取景器中的图像的同时与瞳孔的位置几乎共轭。 该装置被配置为使照明光束入射到照明光导体的一个可透过面上,并且在另一个透光面上离开以照亮显示部。 因此,与取景器中的图像一起观察显示部。