| 摘要 |
<p>PURPOSE:To automatically and correctly enable to set the reproducing moving speed, by controlling the rotary speed of the drive source and by making agreement the reproducing speed of the recording media with the moving speed at recording. CONSTITUTION:The capstan motor 2 is a DC motor and it is driven with the output voltage of the amplifier 15, and the output voltage 16 of the tachogenerator built in the motor is DC and given to one input of the differential amplifier 14. Further, the output voltage 17 of the Schmitt trigger circuit 13 is given as another input, and the number of revolutions of the capstan motor 2, that is the carrying speed of the recording media 1 is determined so that the both input voltages can be equal. Thus, the output voltage related to the number of revolutions picked up from the drive source and the output voltage of the trigger circuit 13 control the number of revolutions to make agreement the reproducing speed of the recording media with the carrying speed at recording, allowing to set the reproduction carrying speed automatically and correctly.</p> |
