LIQUID CRYSTAL ABERRATION CORRECTING ELEMENT

摘要

A novel liquid crystal aberration correcting element capable of correcting aberration caused by the thickness deviation, etc. of an optical disk to thereby enhance a recording/reproducing accuracy. The liquid crystal aberration correcting element comprises liquid crystal and a plurality of electrodes facing each other across liquid crystal. A plurality of non-electrode portions (201) each free from an electrode material and in a hole shape are formed in an electrode (20), and a lens effect occurs on the inner side of a non-electrode portion (201) due to non-uniform orientation of liquid crystal when a voltage is applied. The plurality of non-electrode portions (201) are changed in size or locating interval or the both according to their positions on an electrode (20) to thereby linearly correct aberration.