Patent ID: 8174945
Filing Date: 2012-05-08
Classification: G11B

Abstract:
1. An optical disk device capable of reproducing information recorded in an optical disk including a Burst Cutting Area (BCA), said optical disk device, comprising: an objective lens for converging a laser light onto the optical disk; an actuator for driving the objective lens; a focus-error-signal generation circuit for generating a focus error signal using a reflected light from the optical disk; and a low pass filter for reducing a noise caused by the BCA, of the focus error signal; and a focus control circuit for controlling the actuator based on the focus error signal which passes through the low pass filter, wherein, when the actuator displaces the objective lens in an optical-axis direction of the laser light, a focus lead-in operation is performed at a BCA radius position by the focus control circuit based on the focus error signal which passes through the low pass filter.