| 摘要 |
The present invention is provided with a disturbance observer which outputs a compensating signal for compensating a driving signal of a linear motor in accordance with (1) an output signal of an acceleration sensor unit which mechanically detects an acceleration of the linear motor, the acceleration moving the optical pickup, and (2) the driving signal of the linear motor. A high pass filter which has a low frequency band cutoff frequency substantially same as that of the acceleration sensor unit is also provided on the path which is formed by connecting the input of the driving signal to the generated compensating signal in the disturbance observer. With the high pass filter, it is possible to prevent the linear motor from being driven too sensitively or too greatly by the disturbance observer due to the driving signal, vibrations, or shocks applied from outside, or noises from the acceleration sensor unit or the circuits, thereby avoiding the danger that the linear motor or the optical pickup is damaged.
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