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    • 10. 发明授权
    • Imaging system using a gradient index lens array with improved depth of
focus
    • 使用渐变折射率透镜阵列的成像系统具有改进的聚焦深度
    • US5450157A
    • 1995-09-12
    • US161630
    • 1993-12-06
    • James D. Rees
    • James D. Rees
    • G02B6/028G02B3/00G02B5/12
    • G02B3/0056G02B3/0087
    • An imaging system is disclosed which incorporates a gradient index lens array to transmit focused light onto an image medium with increased Depth of Focus (DOF) and no loss of radiometric efficiency. The lens array is first constructed so that its exit pupil is generally symmetrical. This first step increases the radiometric efficiency of the lens array relative to prior art lens arrays. In a second step, the DOF is increased by reducing a quantity n.sub.o .sqroot.AR which is associated with the lens, n.sub.o being the axial refractive index of the fibers comprising the lens array, .sqroot.A being the gradient index constant of the material comprising the lens array and R being the radius of the individual optical rods, As this quantity is reduced, the DOF increases consistent with a trade off of reduced radiometric efficiency. Since the efficiency was initially increased from some optimum value, the DOF can be increased until the desired radiometric efficiency level is reached.
    • 公开了一种成像系统,其包括梯度折射率透镜阵列,以将聚焦光传输到具有增加的聚焦深度(DOF)的图像介质上,并且不损失辐射效率。 首先构造透镜阵列使其出射光瞳大致对称。 该第一步骤相对于现有技术的透镜阵列增加了透镜阵列的辐射效率。 在第二步骤中,DOF通过减少与透镜相关联的数量2ROOT AR而增加,不是包括透镜阵列的光纤的轴向折射率,2ROOT A是包括透镜的材料的梯度折射率常数 阵列和R是单个光学棒的半径。随着这个数量的减少,自由度增加与降低的辐射效率的折衷一致。 由于效率最初从一些最佳值增加,可以增加DOF,直到达到所需的辐射效率水平。