Patent ID: 8174941

Claim:
An optical disc apparatus that records information onto and reads information from an optical disc having a track including a land and a groove, the apparatus comprising: a focus error detection unit operable to detect a focus error signal based on reflection light from a spot of light focused on the optical disc and output the focus error signal; a tracking error detection unit operable to detect a tracking error signal based on the reflection light and output the tracking error signal; an optical crosstalk correction amount determination unit operable to determine a correction amount used to correct an output of the tracking error detection unit based on a signal component, having the same phase as the tracking error signal, that leaks from the tracking error signal into the focus error signal occurring in reflection light from the optical disc when the spot crosses the track; a multiplier operable to multiply an output of the tracking error detection unit by the correction amount determined by the optical crosstalk correction amount determination unit; an adder operable to add an output of the focus error detection unit and an output of the multiplier; a focus control unit operable to control focus of the spot based on an output of the adder; and a tracking control unit operable to execute tracking control based on an output of the tracking error detection unit; wherein the optical crosstalk correction amount determination unit determines a rough correction amount of the correction amount used to correct the output of the tracking error detection unit based on an amplitude value of a signal component of the tracking error signal that leaks into the focus error signal when focus control of the spot is being executed and tracking control of the spot is not being executed, and determines a precise correction amount of the correction amount used to correct the output of the tracking error detection unit based on a signal component that leaks from the tracking error signal into the focus error signal when focus control of the spot is being executed and tracking control of the spot is being executed, the signal component with the same phase as the tracking error signal.