| 摘要 |
<p>A load tub (24) is supported at the end of a head actuator member (21) opposed to a recording disk. A ramp member (25) is secured outside the recording disk. The ramp member (25) has a passage for the load tub (24), which is laid out along a circular arc drawn with a predetermined curvature. The magnetic poles are aligned along the passage. When the load tub (24) moves along the passage on the ramp member (25), an electromagnetic conversion element reads the magnetic poles on the ramp member (25). Based on changes of the magnetic poles, the position of the load tub (24) is identified on the ramp member (25). Based on the position and elapsed time, the moving speed of the load tub (24) is identified. Based on the identified moving speed, the swing of the head actuator member (21) is controlled.</p> |
