Research on The Variable-Focus Liquid-Crystal Lens and Its Application to Practical Use

制备了楔型液晶均质盒，并测量了它们的光学特性。然后，制备形状类似于具有均匀对准的平凸菲涅耳透镜的液晶透镜单元。通过在电池上施加电场，它们的焦距可以从非常射线的fe值变化到普通射线的近fo值。在液晶透镜中获得了几秒钟内的响应和恢复时间。利用两个光轴正交的液晶菲涅耳透镜的双层结构，实现了更高透光度的变焦透镜，并提出了补偿液晶透镜非线性的驱动方法。利用补偿电路和液晶透镜构成自动聚焦透镜系统，测量了液晶的折射率、色散和寻常光的阿贝数。本文从液晶透镜盒的色散和折射率分布出发，讨论了液晶透镜的像差问题，制作了适合于白内障患者的圆形液晶透镜，并对几例白内障患者进行了测试。作为眼镜的应用，得到了某种程度上合理的结果，即，焦深的远视极限可以通过施加电压连续地变化，视力的降低不显著。具有凹透镜的液晶凸透镜的光焦度可以通过增加施加电压从正变为负。

Liquid-crystal wedge-type homogeneous cells are prepared and their optical properties are measured. Then, liquid-crystal lens-cells shaped like a plano-convex Fresnel lens with homogeneous alignment are prepared. Their focal length can be varied from the value fe for an extraordinary ray to nearly fo for an ordinary ray by applying an electric field across the cell. The response and recovery times within several seconds are attained in the liquid-crystal lenses. More transparent variable-focus lenses are achieved in the double-layered structure of two identical liquid-crystal Fresnel lenses with a mutually orthogonal optic axis.Driving method to compensate for nonlinearity of the liquid-crystal lens is presented. Autofocussing lens system is made by using the compensation circuit and the liquid-crystal lens.Refractive indices and dispersions of nematic liquid crystals and their Abbe's numbers are measured for an ordinary and extraordinary ray. Aberrations of the liquid-crystal lens are discussed based on the dispersion and the distribution of refractive indices in the liquidcrystal lens cell.As wearable glasses, round shaped liquid-crystal lenses fitting to a testing equipment for patients are made and is tested for several cases of cataracts. Somewhat reasonable results as an application to glasses are obtained, that is, the hyperopic limit of the depth of focus can continuously be varied by applying a voltage, and lowering of eyesight is not remarkable.The power of the liquid-crystal convex lens with a concave lens can be changed from positive to negative by increasing an applied voltage.