Patent ID: 8072858
Filing Date: 2011-12-06
Classification: G11B

Abstract:
1. An optical disk apparatus comprising: a rotary drive unit which rotationally drives an information carrier; a rotational phase detection unit which detects a rotational phase of the information carrier; an optical head having a collecting unit which collects an optical beam on the information carrier; a lens position detection unit which detects a position of the collecting unit in the optical head as a position signal; a lens position storage unit which stores, in synchronization with a rotational phase to be detected by the rotational phase detection unit, the positional signal from the lens position detection unit corresponding to the rotational phase to be detected; an output unit which outputs as a correction signal, in synchronization with a rotational phase to be detected by the rotational phase detection unit, the positional signal stored by the lens position storage unit and which has already been detected by the lens position detection unit; a lens position correction unit which corrects the position signal detected by the lens position detection unit using the correction signal; an eccentricity correction unit which generates a drive signal using a signal from the lens position correction unit and, based thereon, moves the collecting unit in a radial direction of the information carrier; and a high-frequency component reduction unit which reduces a high-frequency component of any of the correction signal, an output signal of the lens position correction unit and the drive signal.