DOUBLE LIQUID-CRYSTAL ABERRATION CORRECTING ELEMENT AND ITS MANUFACTURING METHOD

摘要

A novel double liquid-crystal aberration correcting element smaller and lighter than conventional ones. The double liquid-crystal aberration correcting element (1) is composed of two liquid-crystal aberration correcting elements stacked in the direction of the thickness. Each liquid-crystal aberration correcting element comprises a pair of substrates on one of which a common electrode is provided and on the other of which a segment electrode (21) having a non electrode portion is provided and a liquid crystal interposed between the paired substrates. Holes (30A, 30B, 30C) are made in the thickness direction in each of the substrates, and terminals (31A, 31B, 31C) each connected to one of the common and segment electrodes are provided to the holes respectively. An injection hole (60) through which the liquid crystal is injected is made in one of the substrates. The alignment directions of the liquid crystal of the two liquid-crystal aberration correcting elements during voltage nonapplication are perpendicular to each other.