Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1995-05-25
1996-08-27
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 9807, 360 9904, 310 67R, 310328, G11B 1728, G11B 1920, H02K 7102
Patent
active
055506887
ABSTRACT:
A technique for preventing damage to ball bearings in a small form factor device where the drive motor has at least one crash stop ring disposed about the shaft and inside the rotor of the motor. The crash stop ring is dimensioned to permit only a small amount of movement of the rotor relative to the shaft. The permitted movement must be less than the minimum movement which would cause damage to the elements of the ball bearing. In an alternative embodiment, a rotor includes a flange extending in the radial direction from the rotor. A piezoelectric ring is rigidly mounted on both sides of the flange to engage one of the planar surfaces of the flange when the piezoelectric ring is in the relaxed state. With two such crash stop rings disposed so that the rings can engage both planar surfaces of the flange, the rotor is effectively clamped between the two piezoelectric crash stop rings whenever the piezoelectric crash stop ting is disconnected from the power source used to contract the piezoelectric material in a direction parallel to the axis of rotation of the rotor.
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Aoyagi Akihiko
Boutaghou Zine-Eddine
Khanna Vijayeshwar D.
Kumar Suresh
Sri-Jayantha Muthuthamby
Bussan Matthew J.
International Business Machines - Corporation
Letson Laurence R.
Levy Stuart S.
Ometz David L.
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