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    • 102. 发明授权
    • Lens system capable of close-up photographing
    • 镜头系统能够进行特写拍摄
    • US4986643A
    • 1991-01-22
    • US374866
    • 1989-07-03
    • Keiji Moriyama
    • Keiji Moriyama
    • G02B9/64G02B15/163
    • G02B15/163
    • A lens system capable of close-up photographing comprises, in succession from the object side, a first lens group having a positive refactive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power. The first lens group and the second lens group are moved relative from each other for focusing to infinity to a close distance so that the spacing between the first lens group and the second lens group is reduced and the spacing between the second lens group and the third lens group is enlarged. The first and second lens groups are designed to satisfy the following condition:1.0
    • 能够进行特写拍摄的透镜系统包括从物体侧连续地具有正反射光的第一透镜组,具有正折光力的第二透镜组和具有负折光力的第三透镜组。 第一透镜组和第二透镜组彼此相对移动以聚焦到无限远到近距离,使得第一透镜组和第二透镜组之间的间隔减小,并且第二透镜组和第三透镜组之间的间隔 镜头组被放大。 第一透镜组和第二透镜组被设计为满足以下条件:1.0
    • 103. 发明授权
    • Optical system for focus state detection
    • 用于焦点状态检测的光学系统
    • US4903066A
    • 1990-02-20
    • US317468
    • 1989-03-01
    • Keiji MoriyamaHiroshi Ohki
    • Keiji MoriyamaHiroshi Ohki
    • G03B13/36G02B7/34G02B13/18
    • G02B7/346
    • A focus state detecting optical system is provided with a condenser lens positioned in the vicinity of or behind a primary image formed by the light coming from an object and transmitted by an objective lens, pupil dividing means positioned behind the condenser lens and adapted for dividing the pupil of the condenser lens symmetrically with respect to the optical axis, and re-imaging lenses positioned parallel to and corresponding to thus divided pupils and symmetrically with respect to the optical axis thereby forming secondary images, wherein the focus state is detected from the relative positional aberration of said secondary images. Each of the re-imaging lenses is composed of a positive lens with two convex faces of which at least one is an aspherical shape.
    • 焦点状态检测光学系统设置有聚光透镜,该聚光透镜位于由来自物体的光形成的原始图像的附近或之后,并由物镜透射,光瞳分割装置位于聚光透镜后方, 聚光镜相对于光轴对称的光瞳,以及重新成像透镜,其平行于并对应于这样分开的光瞳并对应于光轴,从而形成二次图像,其中从相对位置检测聚焦状态 所述二次图像的像差。 每个重新成像透镜由具有两个凸面的正透镜组成,其中至少一个是非球面形状。
    • 104. 发明授权
    • Telephoto zoom lens
    • 长焦变焦镜头
    • US4840469A
    • 1989-06-20
    • US114581
    • 1987-10-30
    • Keiji Moriyama
    • Keiji Moriyama
    • G02B15/173
    • G02B15/173
    • A telephoto zoom lens comprising, in succession from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, the lens groups being moved independently of each other during zooming. The telephoto zoom lens meets certain conditions, including a condition that prescribes the amount of change in spacing between the first and second lens groups by zooming, so that the spacing increases at the telephoto end. The telephoto ratio is large, and the lens is relatively compact at the wide angle end. The burden borne by each lens group regarding correction of spherical aberration is reduced, and correction of spherical aberration is relatively easy, so that the degree of freedom in lens design is enhanced.
    • 一种长焦变焦透镜,其从物体侧依次包括具有正折光力的第一透镜组,具有负折光力的第二透镜组和具有正折光力的第三透镜组,所述透镜组独立地移动 在缩放期间。 长焦变焦镜头满足某些条件,包括通过缩放来规定第一和第二透镜组之间的间隔的变化量的条件,使得在望远端处的间距增加。 长焦比大,镜头在广角端相对较小。 每个透镜组对球面像差校正所承受的负担减小,并且球面像差的校正相对容易,从而增强了透镜设计的自由度。