| 摘要 |
<p>PURPOSE:To quicken a servo convergence at the time of still.slow release and to perform the transfer to an ordinary reproduction with good stability by adding the capacitor to hold the servo voltage at the reproduction time of the still and slow to a control circuit. CONSTITUTION:At the still.slow reproduction time its servo voltage is held by the capacitor C2 connected to the base of a transistor TR in a control circuit 6. This held voltage is made to apply on the base of the transistor TR at the still.slow release time. The transistor TR is therefore turned on to reduce the servo gain, when the servo error voltage is rapidly raised at the still.slow release time. The convergence of the servo voltage to the ordinary servo voltage is thus quickened. Consequently the transfer to the ordinary reproduction can be performed with good stability.</p> |
