| 摘要 |
PROBLEM TO BE SOLVED: To provide a track jump device in which a stable track jump is conducted while a certain amount of track jump time is secured even though a track pitch is narrow and a tracking servo is stabilized in a short time. SOLUTION: A reference position, which varies with a constant speed condition between the positional change of an acceleration state and a deceleration state shown in (A), is outputted from a reference position generator and inputted into a feed forward compensator. The compensator has a characteristic, that is approximated by a 2nd order differentiator, and a feed forward output having a constant speed interval between an acceleration pulse and a deceleration pulse shown in (C) is supplied to the driver of an actuator. Then, tracking error signals detected by the movement of the actuator are linearly converted and a feedback control is executed so that the positional deviation between the linearized positional output after the conversion and the reference position shown in (A) is reduced.
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