Patent ID: 7164521
Filing Date: 2007-01-16
Classification: G02F,G11B

Abstract:
1. An aberration compensating device for compensating aberration of a laser beam which is emitted from a light source and converged on an optical recording disk through an objective lens comprising: a liquid crystal panel including a liquid crystal layer whose refractive index is changed in accordance with an applied voltage and transparent electrodes which are disposed so as to interpose the liquid crystal layer therebetween; and a liquid crystal panel control part for controlling the applied voltage which is applied to the transparent electrodes; wherein at least one of the transparent electrodes includes a center part in an approximately circular shape and an outer peripheral part surrounding the center part, and the outer peripheral part includes a plurality of outer peripheral divided parts which are divided around the center part, and when a diameter of an incident area of the laser beam corresponding to a pupil diameter of the objective lens on the liquid crystal panel is set to be “D1” and a diameter of the center part is set to be “D2”, (D2/D1) is set at a value in the range 0.5 to 0.65.