| 摘要 |
PURPOSE:To eliminate the deterioration of the follow-up properties due to the variance and change of the component elements and the state amount of a speed control system and to attain the fast and stable control of speed, by detecting the variance and change of the system component elements during an acceleration mode and setting a target speed of the decleration mode in response to the result of said detection. CONSTITUTION:A timing signal A23 is added newly together with an integration circuit 24, a timing signal part B28 and an analog multiplying circuit 26. The circuit 26 integrates a voice coil current amount 15 by the signal A23 concurrently with the start of a seeking action. A target speed 102 is used for the seeking action. When the real speed reaches the speed 102, the signal B28 is turned on. Then a system state amount 25 of the output of the circuit 24 is multiplied by a target speed 19 through the circuit 26. Thus a target speed 27 is obtained in response to the state of a speed control system.
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