| 摘要 |
Lens (20) is accelerated on a coarse tracking carriage (2) while enabling a lens position servo, which moves the carriage to return the lens to a neutral position on the carriage; after the beam spot (BS) becomes fast enough, the carriage is accelerated and decelerated until the beam spot arrives near a destination track; then the lens is decelerated on the carriage to stop on the destination track while not stopping at each track to cross. A second method is: the carriage is first accelerated while the fine tracking servo (3) is enabled to trace a start track; after the carriage becomes fast enough, the fine tracking servo is disabled, thus the beam spot is moved by a lens lock force which returns the lens to the neutral position on the carriage; the carriage is further accelerated and decelerated, next the lens is decelerated, respectively by the same ways as in the first method. |
