An acceleration pulse waveform adjustment circuit (10) and a reduction pulse waveform adjustment circuit (11) change the amplitude of the track jump according to the linear velocity so that stable track jump is performed over a wide range of linear velocity. Moreover, when changing the tracking gain by the linear velocity, the acceleration pulse waveform adjustment circuit (10) and the reduction pulse waveform adjustment circuit (11) makes the acceleration pulse amplitude greater and the reduction pulse amplitude smaller if the tracking gain is high, so that stable track jump operation is performed at the respective tracking gains.
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