Application of a Liquid Crystal Lens to an Optical Disc Memory Device

液晶透镜在光盘存储装置中的应用

• 批准号: 02555078
• 负责人: SATO Susumu
• 金额: $ 4.8万
• 依托单位: AKITA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555078/
• 关键词: Optical disk Head; Liquid Crystal Lens; Liquid Crystal Microlens; Variable Focus Lens; Driving Method of Liquid Crystal Lens

An optical head shows a limitation of its miniaturization and highspeed accessions because of its mechanical control of an object lens for focus adjustment. The aim of this research project is applying a liquid crystal lens, of which focal length can be controlled by applying voltage, to an optical head.An axially symmetric nonuniform electric field is produced in a liquid crystal cell with a hole-patterned electrode, and radial distribution of refractive indices; that is, a liquid crystal microlens can be obtained by a molecular orientation effect in a nonuniform electric field. Optical properties and response properties of a homogeneously aligned or a hybrid-aligned liquid crystal microlens with an asymmetric electrode structure of a hole-patterned electrode and a flat electrode have been investigated. In the homogeneously aligned liquid crystal microlens with the asymmetric electrode structure, electrode structure, a disclination line which worsens the lens properties, is observed i … More n the direction perpendicular to the molecular orientation. Such a disclination line is eliminated by adopting a hybrid-aligned molecular orientation. However, the lens properties are not improved very much since a shifting effect of the lens center appears. Then more significant improvements can be expected by suppressing such deteriorating factors. Then, a homogeneously aligned liquid crystal microlens with hole patterns on both surfaces of the substrates is prepared and its optical properties are investigated. Concentrically circular and defect-free distribution properties of refractive indices can be obtained as a result of uniform tilt direction of the molecules; that is, some detrimental effects of lens properties in hitherto prepared lenses are eliminated and the lens properties are eceedingly improved. When a high voltage is suddenly applied across the microlens, the disclination lines appear immediately after the voltage is applied even if the liquid crystal microlens with the symmetrical electrode structure is used. The disclination lines does not disappear and it remains for a long period of time after voltage is removed.The response properties can be improved and the creation of the disclination lines can be suppressed by using a method of bias voltage application. The applied voltage is changed between the bias voltage and the target voltage. Then no disclination lines are observed, and the optical properties of the liquid crystal micro-lens and their reappearance can be improved. In addition, the response properties of the liquid microlens can be improved and the creation of the disclination lines can be suppressed by using the method of the bias voltage application. T disclination lines can be suppressed by using the method of the bias voltage application. Then a requirement for applying the microlens to the optical head today are seemed to be satisfied. requirement for applying the microlens to the optical head today are seemed to be satisfied.The possibility of application of the liquid crystal microlens to the optical head is discussed. Less

由于光学头对物镜进行机械控制以进行焦点调节，因此其小型化和高速化受到限制。该研究项目的目的是将一种可以通过施加电压来控制焦距的液晶透镜应用于光学头。在带有孔图案电极的液晶盒中产生轴对称非均匀电场，并实现折射率的径向分布；即，可以通过不均匀电场中的分子取向效应来获得液晶微透镜。研究了具有孔图案电极和平面电极的不对称电极结构的均匀取向或混合取向液晶微透镜的光学性质和响应性质。在具有不对称电极结构的均匀取向液晶微透镜中，在与分子取向垂直的方向上观察到电极结构，即使透镜特性恶化的向错线。通过采用混合排列的分子取向可以消除这种向错线。然而，由于出现了透镜中心的偏移效应，因此透镜性能并没有得到很大改善。然后，通过抑制这些恶化因素，可以期待更显着的改善。然后，制备了在基板的两个表面上具有孔图案的均匀取向的液晶微透镜并研究了其光学性能。由于分子倾斜方向一致，可获得同心圆且无缺陷的折射率分布特性；也就是说，消除了迄今为止制备的镜片中镜片性能的一些有害影响，并且镜片性能得到了不断改善。当在微透镜上突然施加高电压时，即使使用具有对称电极结构的液晶微透镜，在施加电压之后立即出现向错线。向错线不会消失，并且在去除电压后仍会保留很长一段时间。通过使用施加偏置电压的方法，可以改善响应特性并抑制向错线的产生。施加的电压在偏置电压和目标电压之间变化。这样就不会观察到向错线，并且可以改善液晶微透镜的光学性能及其再现性。另外，通过使用偏置电压施加的方法，可以改善液体微透镜的响应特性并且可以抑制向错线的产生。 T向错线可以通过施加偏置电压的方法来抑制。那么今天将微透镜应用于光学头的要求似乎已经满足。目前微透镜应用于光学头的要求似乎已经满足。讨论了液晶微透镜应用于光学头的可能性。较少的

项目成果

Toshiaki NOSE: "Optical Properties of a Liquid Crystal Microlens with a Symmetric Electrode Structure" Japanese Journal of Applied Physics. 30. L2110-L2112 (1991)

Toshiaki NOSE：“具有对称电极结构的液晶微透镜的光学特性”日本应用物理学杂志。

Toshiaki NOSE: "Memory Effects in Nematic Liquid Crystals by a Surface Molecular Orientation" Japanese Journal of Applied Physics. 30. 3450-3455 (1991)

Toshiaki NOSE：“表面分子取向对向列液晶的记忆效应”日本应用物理学杂志。

Toshiaki NOSE: "LCD Devices Obtained with Scattering Properties of Microlens Effects" Proceedings of the Society for InformationDisplay. 32. 177-181 (1991)

Toshiaki NOSE：“利用微透镜效应的散射特性获得的 LCD 设备”信息显示学会会刊。

T.Nose and S.Sato: "Optical Properties of a Hybrid Aligned Liquid Crystal Microlens" 13th International Liquid Crystal Conference. APP-50-PII37. (1990)

T.Nose 和 S.Sato：“混合对准液晶微透镜的光学特性”第 13 届国际液晶会议。

T.Nose, S.Saisu and S.Sato: "Light Scattering Effects in a Randomly Arranged Liquid Crystal Microlens Array" Korea-Japan Joint Symposium on Information Display. EID 90-62. 77-82 (1990)

T.Nose、S.Saisu 和 S.Sato：“随机排列的液晶微透镜阵列中的光散射效应”韩日信息显示联合研讨会。