| 摘要 |
<p>PURPOSE:To reduce fluctuation in the tape speed by providing a first and a second error amplifiers, and a torque commandor to add the output voltages of the first and second error amplifiers and to control the current of a motor which drives a magnetic tape. CONSTITUTION:Any frequency component of speed fluctuation generated on the magnetic tape is amplified as voltage fluctuation uniformly by the error amplifier 17, and converted to the driving torque of a reel motor 6S(6T) in a direction to cancel the speed fluctuation by the torque commandor 7S(7T). However, constant tape speed fluctuation remains due to resonance by the elasticity of the magnetic tape and the inertia of a tape feed system only by using the error amplifier 17. Then, a guide roller component in a tape speed fluctuation component can be reduced by adding the output voltage of the error amplifier 18 on the output of the error amplifier 17. In such a manner it is possible to reduce the guide roller component in a tape cassette in which the tape is feeding and to reduce the speed fluctuation of the magnetic tape.</p> |
