Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1997-08-15
1999-11-02
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360108, G11B 2116
Patent
active
059781785
ABSTRACT:
A disk drive system includes a base, a disk rotatably attached to the base, and an actuator assembly pivotally attached to the base. The actuator assembly moves the transducer to selected areas of the disk where information representative of data is to be written or read. The actuator assembly maintains the transducer in a transducing relationship with the disk. The actuator assembly includes an arm and a head gimbal assembly. The head gimbal assembly includes a suspension. The arm has a length from the point where it pivots to the end of the arm. The length of the arm is greater than 1.5 times the length of the suspension. The ratio of the length of the arm to the length of the suspension is in the range of 2.0 to 10.0. The arm is made of a composite material that includes elongated stiffening fibers. The resulting composite has a stiffness to mass ratio higher than aluminum, steel, or magnesium. An actuator arm made of the composite material having the high stiffness to mass ratio resonates at a frequency greater than 3 kHz, which is outside the operating range of the actuator servo bandwidth. The arm and the suspension can be thought of as having a fixed length for a certain design. The length of the arm, made of the high stiffness to mass material, is extended and the length of the suspension is shortened to form an actuator assembly of the overall length with higher than previously obtainable resonance frequencies.
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Questek Innovations, Inc.
Wolff John H.
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