| 摘要 |
PURPOSE:To execute always stably tracking servocontrol by controlling a gain adjusting means which changes the transmission gain of a tracking error signal path respectively in the case in which a light beam comes from the recording part in the user's recordable part of a disk and the case in which the beam comes from the non-recording part. CONSTITUTION:A gain adjusting circuit 30 is provided between an outut terminal of a divider circuit 24 and the input terminal of a phase compensating circuit 25 so that the gain of a driving part for supplying the driving signal obtd. from the amplified and corrected tracking error signal TE' obtd. from the circuit 24 to a driving coil 10 for tracking adjustment can be changed. The circuit 30 is so controlled that the transmission gain for the signal TE' from the circuit 24 is increased in the period when the signal Qc has a high level (h), i.e., when the light beam incoming from the recording part of the disk D enters a photodetector 15. Said circuit is so controlled as to decreasedthe transmission gain in the period when the signal Qc has a low level (l).
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