| 摘要 |
An optical disk system comprises a laser system for optically reading a signal track on an optical disk by means of a laser beam so as to generate an electrical read-out signal, and a servo system receiving the read-out signal from the laser system for controlling the laser system so as to cause the laser system to trace the signal track on the optical disk. A drive power changing circuit is coupled to the servo system to selectively put the servo system either into a first condition in which a driving power of the servo system for controlling the laser system is limited not greater than a predetermined level or into a second condition in which the driving power of the servo system for controlling the laser system is not limited.
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