| 摘要 |
<p>The optical disc apparatus of this invention includes:
an optical pickup 104 to converge a light beam on an information layer of an optical disc 102; a drive section 105 to move the beam along the radius of the disc 102; a tracking error detecting section 108 for generating a tracking error signal based on a light detection signal; a tracking control section 109 to drive the drive section 105 based on the tracking error signal to make the beam follow tracks on the disc 102; a defect detecting section 124 for detecting, based on the light detection signal and with respect to a preset detection reference level, a fingerprint or a bubble on the disc 102 as a defect to output a defect detection signal; and
a waveform shaping section 126 to output a hold signal that holds, in response to the defect detection signal, a signal from the tracking control section 109 at a level just before the defect has occurred. The apparatus is initially operated not to hold the signal from the tracking control section 109 even if there is a defect. But once a tracking failure has occurred during a read operation, settings are changed to hold the signal from the tracking control section 109 against the defect while the read operation is retried.</p> |
