| 摘要 |
A controller instructs a spindle motor to start rotating, and instructs a servo control section to start a focus servo control. When a light beam crosses information tracks on an optical disc with a rotation of the optical disc, an amplitude indicating signal generating section detects changes in the amplitude of a readout signal output from an optical pickup. A disc type identifying section identifies types of optical discs having different track pitches of the information tracks in starting the rotation of each optical disc based on the peak value and bottom value or the amplitude of the readout signal. Consequently, the types of optical discs having different information recording densities, particularly different track pitches, can be identified at an early stage without waiting for reproduction of information recorded on each optical disc. It is therefore possible to shorten the time for starting an optical disc device, or prevent an increase in the starting time.
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