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    • 44. 发明授权
    • Lens for reading an original image
    • 用于读取原始图像的镜头
    • US5680254A
    • 1997-10-21
    • US309477
    • 1994-09-21
    • Takeshi UedaNaoki MiyatakeKiichiro NishinaTakao YamaguchiNoriyuki Iwata
    • Takeshi UedaNaoki MiyatakeKiichiro NishinaTakao YamaguchiNoriyuki Iwata
    • G02B9/00G02B9/12G02B13/24G02B3/00
    • G02B9/12
    • A lens for reading an original has first to third lens groups sequentially arranged from an object side toward an image side. The first lens group is constructed by a first lens as a positive meniscus lens having a convex face on the object side. The second lens group is constructed by a second lens as a biconcave lens. The third lens group is constructed by a third lens as a biconvex lens. The first lens is constructed by a refractive index distribution type lens having a refractive index changed in a direction perpendicular to an optical axis of the original reading lens. Each of the second and third lenses is constructed by a refractive index distribution type lens having a refractive index changed in a direction of the optical axis. Otherwise, at least one of the first, second and third lenses may be constructed by a refractive index distribution type lens. In this lens construction, the original reading lens can be made compact and a field angle of this lens can be easily widened and high performance of the original reading lens can be easily realized.
    • 用于读取原稿的透镜具有从物体侧朝向像侧顺序排列的第一至第三透镜组。 第一透镜组由作为物体侧具有凸面的正弯月形透镜的第一透镜构成。 第二透镜组由第二透镜构成为双凹透镜。 第三透镜组由第三透镜构成为双凸透镜。 第一透镜由折射率分布型透镜构成,折射率透镜在与原始读取透镜的光轴垂直的方向上变化。 第二透镜和第三透镜中的每一个由折射率在光轴方向上变化的折射率分布型透镜构成。 否则,第一,第二和第三透镜中的至少一个可以由折射率分布型透镜构成。 在该透镜结构中,可以使原始的读取透镜紧凑,并且可以容易地扩大该透镜的视场角,并且可以容易地实现原始读取透镜的高性能。