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US 6,661,751 B2Granted
Track-following method in optical disc apparatus and optical disc apparatus adopting this method
AssigneeKabushiki Kaisha Toshiba
InventorMakoto Asakura
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AssigneeKabushiki Kaisha Toshiba
InventorMakoto Asakura
Estimating the term…
In a track-following method in a DVD-RAM disc, CAPA detection is avoided during the track-following process, and a track-following operation is stably made from a high-speed state using adaptive deceleration pulses. In order to avoid CAPA detection during the track-following process, a CAPA is detected from a tracking error signal using a high-pass filter, and the track-following start timing is set within 0.4 ms after the detection of the CAPA. The pulse width of the adaptive deceleration pulses to a lens actuator is variable so that the tracking error signal follows a standard tracking error signal. The zero-crossing point of the tracking error signal after the detection of the CAPA is set as the track-following start timing, and tracking-servo is started after an adaptive brake process for varying the deceleration pulse width based on the difference between the tracking error signal and standard tracking error (TE) signal.
A method of guiding an optical beam on a target track on an optical disc having lands and grooves defining tracks, each of the tracks including sectors having header regions in which pre-pits are formed, comprising:
An optical disc apparatus configured to guide an optical beam on a target track on an optical disc having lands and grooves defining tracks, each of the tracks including sectors having header regions in which pre-pits are formed comprising:
Dependencies are inferred from the claim text.