| 摘要 |
<p>PURPOSE:To attain the high speed tape traveling control of constant speed by detecting the number of tracks scanning a head and controlling the revolution of a reel motor driving a reel base so that the number can be a required value. CONSTITUTION:Since a tape is traveled from one-fold to 100-fold from a tape traveling speed detecting means, a control signal eT is outputted. On the other hand, for the revolution of a cylinder, the reference voltage ES of a driving amplifier is supplied by the output eT of the tape speed detecting means, and the number is set so as to lock to 2,000rpm by a voltage ET1 at the time of the usual reproduction and to 2,500rpm by a voltage ET3 when the tape speed is 100-fold. Namely, the number is set so that a point N1, in which f-V converter outputs ES1 and ET1 come to be equal, is equivalent to 2,000rpm, and a point N2, in which ES2 and ET3 are equal, is equivalent to 2,500rpm. Thus, since the tape speed rises and eT is successively decreased from the ET1, it is coincident with the rising curve of the tape speed and a follow-up change is automatically executed.</p> |
