| 摘要 |
PROBLEM TO BE SOLVED: To adjust the gain deviation in a servo loop accurately and in a short time by reducing sufficiently the influence of surface wobbling of a disk, external vibration of a device or noise generated from the disk, or the like in an optical disk device. SOLUTION: A disturbance signal of the prescribed frequency is applied to a servo system, averaging processing is performed for a signal to which the disturbance signal is added and a round signal before addition, amplitude values of the prescribed frequency components of respective signals are detected, division of the detected amplitude values is performed, the loop gain is calculated, and gain adjustment of the servo system is performed based on the calculated loop gain. Also, If band pass filter processing is performed before the averaging processing, gain adjustment can be performed more accurately. Also, gain adjustment can be performed with less memory quantity by comparing the phases of the external disturbance signal and the round signal and adjusting gain. COPYRIGHT: (C)2004,JPO
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