LIQUID CRYSTAL UNIT FOR CORRECTION OF ABERRATION, OPTICAL PICKUP DEVICE AND DEVICE FO CORRECTION OF ABERRATION

摘要

PROBLEM TO BE SOLVED: To provide a small-size high-performance aberration correction unit which can correct even large aberration and to provide an optical pickup device and an aberration correction device having the aberration correction unit.;SOLUTION: The unit has a first electrode and a second electrode facing each other and a liquid crystal disposed between the first electrode and second electrodes to change the phase of the light passing through the liquid crystal by applying a voltage. The first and second electrodes are formed in such a manner that the liquid crystal generates an effect of a holographic diffraction grating by applying a voltage.;COPYRIGHT: (C)2002,JPO