| 摘要 |
A magnetic recording or reproducing apparatus in which a magnetic head is projected beyond a regulation level of a rotating sheet of magnetic recording medium against the sheet for magnetic recording or playback. The apparatus includes a driver unit for driving the sheet in steady rotation, a sensor device for sensing the rotational speed of the sheet, a head transport mechanism for transporting the magnetic head radially across a recording surface of the sheet, and control circuitry for controlling the driver unit, sensor device and head transport mechanism for causing the magnetic head to be transported to a desired one of tracks of the sheet for effecting tracking. The control circuitry, when the apparatus is powered on, causes the driver unit to rotate the sheet, and inhibiting the head transport mechanism from transporting the magnetic head until the rotational speed of the sheet sensed by the sensor device reaches a predetermined value.
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