| 摘要 |
PROBLEM TO BE SOLVED: To reduce a dynamic tilt in a radial direction arising from a structure of an optical pickup by the control of a lens actuator. SOLUTION: A controller of the lens actuator includes: a focus control part 51 for outputting a focus control signal corresponding to a focus error signal; a tracking control part 52 for outputting a tracking control signal corresponding to a track error signal; a dynamic tilt correction table 55 for outputting a tilt correction amount corresponding to the number of revolutions of a disc; a memory 56 for storing a disc eccentricity amount; a synchronization signal generation part 54 for outputting an AC signal of the same cycle as the cycle of the tracking control signal; a dynamic tilt control signal generation part 57 for correcting amplitude of the AC signal according to the tilt correction amount and the disc eccentricity amount, and outputting the signal after the correction; and a signal addition part 58 for superimposing an output signal from the dynamic tilt control signal generation part on a focus control signal. COPYRIGHT: (C)2010,JPO&INPIT
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