| 摘要 |
A head unit control device having an optical head unit for radiating a laser beam onto a magneto-optical disc, and a magnetic head unit including a floating magnetic head and a fixed magnetic head. Luminous flux is radiated onto the magnet head unit and the optical head unit. The luminous flux reflected by these units is sensed by photo detectors, so that a relative position error signal is generated by a sensing circuit. When information is overwritten onto the magneto-optical disc on which information has already been previously recorded, the floating magnetic head is moved synchronously with the optical head, based on the relative position error signal. When information is recorded on the magneto-optical disc on which information has not been previously recorded, the fixed magnetic head is moved synchronously with the optical head, based on the relative position error signal.
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