| 摘要 |
PROBLEM TO BE SOLVED: To prevent the off-track of a head by disturbance by providing a disk casing on a disk side or a substrate to be mounted at the casing from a pivot with acceleration detecting means for detecting the accelerations in two directions which are parallel to each other and are not aligned in the longitudinal direction of the casing. SOLUTION: The surface of the casing 101 facing a disk surface is provided with the acceleration detecting means 109 on one side at a plane of <=10 deg. in an angle TZ formed with the surface of the disk mounting part of a spindle shaft and is provided with another acceleration detecting means 108 in parallel thereto. The acceleration detecting means 108 and 109 are arranged in the positions where the accelerations of straight lines 110 and 111 in the working directions of non-aligned two sensors are detected within a range of >=15 to <=75 deg. in the angle TX1 formed with the wall surface of the easing 101 within the surface of a magnetic disk 103 and within the surface parallel thereto. The acceleration detecting means are arranged by providing these means with the angle with respect to the casing side wall, by which the detection of the translation accelerations within the surface nearly parallel to the surface of the disk 103 by using the two acceleration detecting means 108 and 109 is made possible.
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