| 摘要 |
PROBLEM TO BE SOLVED: To reduce load of a shutter at opening/closing driving by rotation of an inner rotor. SOLUTION: In a disk drive unit, top ends of a projected part 72 for beginning opening/closing of the shutter and a projected part 75 for ending opening/ closing of the shutter of a rack member 71 which is successively engaged to a recessed part 26 for beginning opening/closing of the shutter and a recessed part 28 for ending opening/closing of the shutter of the inner rotor 4 and successively rotating drives the inner rotor 4, are formed to a R-shape.
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