| Project/Area Number |
59850048
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
電子材料工学
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| Research Institution | Akita University |
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Principal Investigator |
SUSUMU Sato Akita University, Mining College, Professor, 鉱山学部, 教授 (50005401)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGUCHI Rumiko Akita University, Mining College,, 鉱山学部, 教務職員 (30170799)
TAKAHASHI Hisashi Akita University, The School of Medicine, Assistant, 医学部, 助手 (30163281)
SAKAI Fumiaki Akita University, The School of Medicine,Assistant Professor, 医学部, 助教授 (70006790)
INOUE Hiroshi Akita University, Mining College, Assistant Professor, 鉱山学部, 助教授 (00091653)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1986: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1985: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1984: ¥3,400,000 (Direct Cost: ¥3,400,000)
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| Keywords | Liquid-Crystal Device / Optical Device / Liquid-Crystal Prism / 可変焦点レンズ |
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| Research Abstract |
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.
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