| 摘要 |
<p>PURPOSE:To keep the tape running speed constant by calculating the deviation for the prescribed running speed of a tape like recording medium based on the tape running speed information to be detected by a tape running speed detecting means. CONSTITUTION:A control output calculation section 25 calculates a deviation (d), gain factor K, control constant A, and servo control value LN based on a former servo control value L and supplies them to an output storage section 26. The stored servo control value L is converted into a PWM signal by a data conversion section 27. A motor servo control circuit 28 generates a servo output EM based on the PWM signal and performs the driving control of a reel motor 11. By repeating the above operation, the number of rotations of the reel motor 11 is gradually deteriorated according to the tape running position or the difference diameter of a winding reel 3. Thus, the tape running speed can be kept nearly constant.</p> |
