VARIABLE FOCUS LENS, LIQUID CRYSTAL LENS, AND DEVICE USING THOSE FOR GIVING STIMULUS TO EYE

摘要

Provided is a liquid crystal lens without requiring a large potential difference to drive it and having an overall shape with low roughness. The liquid crystal lens (100) includes two parallel transparent plates (10), two transparent electrodes (20) along the inner sides of the plates (10), and a liquid crystal layer (30) placed between the plates (10).  On at least one of the inner sides of the two transparent electrodes (20), powder of barium titanate which is dielectric is adhered with a concentric distribution of the concentration decreasing from the center of the plates (10) toward the periphery.  When a potential difference between the transparent electrodes (20) is produced, the electric field produced in the space where the liquid crystal layer (30) is placed is different in different portions because of the existence of the dielectric.  Since, the degree of orientation of the liquid crystal layer (30) varies in the different portions, the liquid crystal lens (100) functions as a lens.