Patent ID: 8547809

Claim:
An optical disk device using a pickup, comprising: a focus actuator that drives an objective lens in a direction of a disk rotary shaft; a tracking actuator that drives the objective lens in a direction of a disk radius; a detector that converts light reflected from the disk into an electric signal; a focus error signal generator which generates a focus error signal based on an output of the detector that converts disk reflected light into the electric signal; a tracking error signal generator which generates a tracking error signal based on the output of the detector that converts the disk reflected light into the electric signal; a focus actuator controller which controls the focus actuator; a tracking actuator controller which controls the tracking actuator; an off-track determination circuit which determines if an off-track condition has occurred, in case a light spot is located around the halfway point between the track being recorded and another track adjacent the track being recorded and in case the tracking error signal crosses a reference level, and controls a recording operation; a wobble signal generator which generates a wobble signal based on the output of the detector that converts the disk reflected light into the electric signal; a first off-track detector which detects that the light spot is off the track based on an output of the wobble signal generator; a zero-cross detector which detects that the tracking error signal crosses zero based on an output of the tracking error signal generator; and a second off-track detector which detects that the light spot is off the track based on the output of the tracking error signal generator, wherein whether the tracking error signal crosses the reference level is determined based on an output of the tracking error signal generator; and wherein the off-track determination circuit controls the recording operation based on an output of the first off-track detector, an output of the second off-track detector, and an output of the zero-cross detector.