| 摘要 |
<p>A rotary drum unit of a helical scan-type magnetic recording/reproducing apparatus used for a video tape recorder or a digital audio tape recorder, which enables the tape to run stably and a track pattern to be formed maintaining high precision. In the helical scan-type rotary head drum of the invention, tape position detecting sensors (3) arranged along an imaginary lead (2) detect a change of the tape (4) on the drums (1) and (6) that have no lead, and an actuator for dynamic tracking is so driven as to correct the deviation amount from the imaginary lead (2), so that the rotary head (5) is moved in the axial direction to effect the scanning.</p> |
