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发明授权
CN101133449B 液晶光学元件 失效 - 权利终止

液晶光学元件
摘要：
由同心圆状的多个同心电极(31～43)构成液晶单元的第1电极(21)，并将这些同心电极分成靠中心的第1同心电极群(44)和靠周边的第2同心电极群(45)，设两群之间的同心电极(36)为独立的单独电极。由两群构成补正高密度DVD的球面象差的第1补正部件，由第1同心电极群(44)构成补正现有型DVD的象差的第1补正部件。在补正现有型DVD的象差时，对单独同心电极(36)供给分别供给其两个相邻同心电极(35)、(37)的电压间的电压。在补正高密度DVD的象差时，对单独同心电极(36)供给与供给靠近外侧的同心电极(37)的电压相同的电压。
摘要（英）：

First electrode (21) of a liquid crystal cell consists of a plurality of circular concentric electrodes (31-43), and the electrodes are divided into a first concentric electrode group (44) close to the center and a second concentric electrode group (45) close to the outer circumference, and the concentric electrode (36) between the both groups is permitted to be an independent electrode. A first correction means for correcting a spherical aberration of a high density DVD is constituted of the both groups, and a first correction means for correcting an aberration of a conventional DVD is constituted of the first concentric electrode group (44). At the time of correcting an aberration of a conventional DVD, the independent concentric electrode (36) is supplied with a voltage between the voltages being supplied to adjacent concentric electrodes (35, 37). At the time of correcting an aberration of a high density DVD, the independent concentric electrode (36) is supplied with a voltage identical to the voltage being supplied to the concentric electrode (37) just on the outside thereof.

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