| 摘要 |
<p>PURPOSE:To prevent the sag of a tape at the time of acceleration and to prevent the damage of the tape by delaying the rise of a capstan and setting it to agree with the rise of a reel on a winding side when the travel speed of the tape is accelerated due to a change in the rotational speed of the capstan. CONSTITUTION:When the key device 2 of a video tape recorder is instructed from a still mode to a three-fold reproduction mode by the operation of a user, it sequentially changes stepwise at the time to of a control signal SCCA from a servo micro computer 3, and a change is terminated in a prescribed time. The rotational speed of the capstan motor 7 is changed with the prescribed time from a time T0 and the rise is delayed. A frequency generator 40 is integrally fitted to the rotation axis of a reel motor 10, and a frequency signal SFG from the generator 40 is supplied to the computer 3. The changed speed of the control signal SCCA is controlled based on the signal SFG and the sag of the tape at the time of acceleration can be prevented.</p> |
