Dynammically symmetric actuator
AssigneeSeagate Technology LLC
InventorsRoger A. Resh, Theodore R. Browning
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Abstract
A dynamically symmetric actuator is disclosed for reducing off-track motion. The dynamically symmetric actuator of the present invention limits torsional or twisting motion of the actuator arm which reduces off-track motion. In one embodiment, the actuator arm includes a thickness step designed to balance stiffness of inner and outer portions of the actuator arm. The thickness step forms multi-thickness tiers, the dimensions of which can be modeled to optimize a first bending mode frequency of the actuator arm to further reduce off-track motion or errors.
Claims20
An actuator for a disc drive comprising:
- an actuator block having a bearing;
- at least one actuator arm having a longitudinal length cantilevered from the actuator block to form a fixed end and an extended cantilevered end and having an asymmetric shape about a dynamic axis along the longitudinal length of the actuator arm to form asymmetric shaped arm portions about the dynamic axis;
- and
- an asymmetric thickness step on the at least one actuator arm having an asymmetric profile about the dynamic axis to form multi-asymmetric thickness tiers configured to compensate for stiffness differences of the asymmetric shaped arm portions of the at least one actuator arm.
An actuator for a disc drive comprising:
- an actuator block supporting an actuator arm having an asymmetric shape about a dynamic axis extending along a longitudinal length of the actuator arm;
- and
- dynamic symmetry means for providing dynamic symmetry for the asymmetric actuator arm.
An actuator for a disc drive comprising:
- an actuator block having at least one actuator arm extending therefrom having an asymmetric shape about a dynamic axis extending along a cantilevered length of the at least one actuator arm to form asymmetric shaped arm portions about the dynamic axis;
- and
- a stiffener formed on the at least one actuator arm to dynamically balance the asymmetric shaped arm portions of the at least one actuator arm about the dynamic axis.
Dependencies are inferred from the claim text.