| 摘要 |
<p>A data recording medium and a data processor for effecting correct tracking. When a detector (31) runs immediately above a track (2) as shown in (x), the signal (d) outputted by the detector (31) corresponds to the signal on the track (2). When the detector moves up and reaches a position shown in (y), the signal of a track (3) mixes into the detector signal (d) and the phase of short-wavelength components advances. On the contrary, when the detector (31) moves down and reaches the position shown in (z), the signal of the track (1) mixes into the detector signal (d) and the phase of the short-wavelength components is retarded. Accordingly, the position of the detector is detected as a phase difference. Since the phase difference of the short-wavelength components can thus be detected, correct tracking can be effected by moving the head until the detected phase difference falls within a predetermined range. The head position can be measured extremely accurately by a single detector, and great effects are brought forth for the reduction of the size and the production cost of the apparatus. Therefore, the present invention is particularly suitable for large capacity data recording. <IMAGE></p> |
