| 摘要 |
A data processing apparatus includes a light source and an objective lens for radiating first and second light beams on a recording medium having a plurality of data and trucking tracks alternately formed and parallel to each other, photodetectors for detecting the tracking error signal from a beam obtained by reflection of the second light beam by the medium, a switching circuit for selectively supplying the tracking error signal to an actuator, a circuit for supplying a moving signal to the actuator to move the first and second light beams, respectively, to a data track different from one data track and a tracking different from one tracking track, and a control unit for monitoring the tracking error signal, for switching the switching circuit to supply the tracking error signal to the actuator in a tracking mode in which a data track is traced with the first light beam, and for switching the switching circuit not to supply the tracking error signal to the actuator in a moving mode for moving the first light beam to a different data track, the control unit interrupting monitoring of the tracking error signal during a period for which the second light beam is passing data tracks in the moving mode.
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