Method for adjusting rotation balance of disk and device for the same
AssigneeInternational Business Machines Corporation
InventorToshiki Hirano
Life of this patent
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Abstract
The present invention provides a method and apparatus to adjust the rotation balance of a disk with high accuracy and ease during manufacturing. A disk is attached to a spindle to form a disk assembly having an adjustable center of gravity. The disk assembly is rotated and thereby generates vibration. A force, which is a function of the vibration, is applied to one or more components of the disk assembly to reduce vibration of the disk assembly below a predetermined value thereby causing the disk assembly to have a second center of gravity.
Claims12
A method for adjusting the rotational balance of a disk, comprising the steps of:
- attaching a disk to a spindle, the disk being adjustably attached to the spindle allowing the disk to rotate with the spindle while allowing the spindle to move in relation to the disk;
- rotating the disk by rotating the spindle with a spindle motor generating vibration;
- converting the vibration into an electrical signal;
- and
- processing the electrical signal to generate electrical pulses which are derived from the vibration;
- using the electrical pulses to apply pulses of force to the spindle to move the spindle in relation to the disk to reduce the vibration.
A method for adjusting the rotational balance of a disk comprising the steps of:
- attaching a weight assembly to a spindle having a disk mounted thereon, the weight assembly being deformable;
- rotating the spindle and the disk;
- and
- applying an external force to deform the weight assembly to reduce a vibration from rotational imbalance.
Dependencies are inferred from the claim text.