| 摘要 |
PURPOSE:To effectively prevent a magnetic disk, servo head and data head from deviating the position by detecting the deviation in the position of the data head and servo head against the magnetic disk due to dislocation of a drive shaft from its axial center. CONSTITUTION:The deviation the positions of the data head and servo head against the magnetic disk 25 due to dislocation of the drive shaft 22 from its axial center at the time of altering the temperature, are detected by detecting part for deviation in the position 34. Based on the detected information of the deviation in the position a bearing 30 is moved by a piezoelectric element 33 as a moving means in order to adjust the dislocation of the shaft 22 from its axial center at the time of changing the temperature. By this method, only simple constitution is enough and the dislocation of the shaft due to the temperature change can effectively prevented. Consequently, the magnetic disk, servo head and data head are effectively prevented from deviating the position.
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