| 摘要 |
A movable unit ( 50 ) is disposed between a loaded recording medium ( 1 ) and a bottom surface ( 4 a) of a base chassis ( 4 ) opposite to the surface of the loaded recording medium ( 1 ). The movable unit includes a spindle motor ( 53 ), a head ( 51 ), guide shafts ( 52 a, 52 b) for supporting the head ( 51 ) movably in a radius direction of the recording medium ( 1 ), and a movable holding device ( 5 ), disposed at the base chassis ( 4 ) swingable downward to the bottom surface ( 4 a), for holding the spindle motor ( 53 ), the head ( 51 ) and the guide shafts ( 52 a, 52 b). The movable holding device ( 5 ) holds at least one of the spindle motor ( 53 ), the head ( 51 ) and the guide shafts ( 52 a, 52 b) movably in a direction moving away from the bottom surface ( 4 a) relative to the movable holding device ( 5 ). A limiting device ( 60 a, 60 b) is disposed between the movable unit ( 50 ) and the bottom surface ( 4 a) for limiting a movable range of the movable unit ( 50 ), so that at least a part of the movable unit ( 50 ) is maintained with a distance apart from the bottom surface ( 4 a), even if the movable holding device ( 5 ) swings down.
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