| 摘要 |
PURPOSE:To attain simple and accurate tracking, by providing a track width larger than a track tracing width and controlling a tracking shift in response to an output difference between two heads where the track tracing is arranged at adjacent positions. CONSTITUTION:In the just tracking state of reproducing heads A, B having a large track width, one end of both head sections is located at the boundary of track tracing, and the other end is located at a position apart from the respective main track by a broader share of the track width. The azimuth angle of the head A is defined as the same direction as the 2nd channel on a track tracing and that of the head B is defined the same direction as the 3rd channel. If a tracking shift takes place, the amplitude value of a reproducing output signal of the heads A, B is changed. Thus, in taking the output difference of both the heads, this difference corresponds to the tracking shift amount. In controlling the output difference so as to be zero at all times in this way, the just tracking state is continued. |
