Patent ID: 8089835
Filing Date: 2012-01-03
Classification: G11B

Abstract:
1. An optical disc apparatus for recording or reproducing information relative to an optical disc, comprising: a laser source for emitting a laser beam; an objective lens for converging said laser beam on an optical disc; an actuator for driving said objective lens; a photo detector for outputting an electric signal corresponding to a reflected light amount from said optical disc; a tracking signal generator for generating a tracking error signal representative of a displacement between said laser beam converged on said optical disc and a track of said optical disc, from an output signal from said photo detector; a lens position signal generator for generating a lens position signal representative of a position of said objective lens in a disc radial direction; and a tracking drive signal generator for generating a tracking drive signal to be input to said actuator, in accordance with said tracking error signal, wherein said tracking drive signal generator generates said tracking drive signal by changing a ratio of said tracking drive signal to said tracking error signal in accordance with said lens position signal.