| 摘要 |
PURPOSE:To adjust highly accurately positional deviation by including information of the direction of movement and the position of signal recording and reproducing element in a signal for adjustment. CONSTITUTION:The place in which the signal is written when reproducing each signal can be made clear by providing plural parts in which reproducing output is low and indicating positions on the circumference of a circle by the arrangement. If the number of parts in which the reproducing output of a set of opposite C signal and D signal is low, an average value of reproduced output of these parts become equal when the magnetic head is on the center line, and become unequal when the magnetic head is deviated from the center line. Accordingly, the amount of positional deviation of the magnetic head can be detected by the ratio of the two. As the information of direction of movement and position of the signal recording and reproducing element and the information of an object of adjustment are included in the signal for adjustment, highly accurate measurement of the position of the magnetic head is made possible. |
