Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-07-26
2005-07-26
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
06922305
ABSTRACT:
Disclosed is an apparatus and method for reducing vibration in dual stage actuators of storage devices such as hard disk drives. The apparatus comprises a compensating mass disposed on an outer arm of the storage device in order to balance the mass and inertia of the outer arm. The compensating mass is provided with an actuator that is driven in unison with a dual stage actuator also disposed on the outer arm. The excitation caused by the dual stage actuator is balanced by the excitation caused by the actuator of the compensating mass. The shape and mass of the compensating mass are selected to simulate the mass and inertia of the inner dual stage actuator. By driving the inner dual stage actuator in unison with the actuator and compensating mass, the torsional input of the voice coil motor is substantially reduced.
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Hudspeth David
Kunzler & Associates
Tzeng Fred F.
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