Magnetic disk vibration-suppressing mechanism having shroud-narrowing gap
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorTakehiko Eguchi
Life of this patent
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Abstract
Embodiments in accordance with the present invention relate to greatly decreasing vibrations of a rotary disk at a portion where vibration on the disks is to be suppressed in a vibration-suppressing mechanism for rotary disks while enabling the rotary disks to be incorporated in the shroud surface. In one embodiment, the vibration-suppressing mechanism for rotary disks comprises at least one rotary disk and a shroud surface extending along and facing the outer circumferential edges of the disk. The shroud surface is so formed as to possess a portion where a gap between the outer circumferential edge of the disk and the shroud surface becomes small near a portion where the vibration of the disk is to be suppressed.
Claims17
A vibration-suppressing mechanism for a disk drive, comprising:
- a disk having an axis of rotation, an outer circumferential edge spanning 360 degrees, and a vibration mode;
- a shroud having a shroud surface extending along and facing the outer circumferential edge of the disk, and the shroud surface has circumferential ends and a circumferential length that spans less than 180 degrees of the disk;
- wherein
- a gap between the outer circumferential edge of the disk and the shroud surface becomes narrow near a portion of the disk where vibration of the disk is to be suppressed to provide an aerodynamic damping force for the disk to vary the vibration mode of the disk, the portion of the disk is circumferentially spaced apart from the circumferential ends of the shroud surface, and the gap varies in radial width throughout the circumferential length of the shroud surface.
A magnetic disk drive, comprising:
- a base;
- a disk rotatably mounted to the base and having an axis of rotation, an outer circumferential edge spanning 360 degrees, and a vibration mode;
- an actuator mounted to the base and having a head for reading data from the disk;
- a shroud having a shroud surface extending along and facing the outer circumferential edge of the disk, and the shroud surface terminates at circumferential ends and has a circumferential length that spans less than 180 degrees of the disk;
- a gap between the outer circumferential edge of the disk and the shroud surface becomes narrow near a portion of the disk where vibration of the disk is to be suppressed to provide an aerodynamic damping force for the disk to vary the vibration mode of the disk, the portion of the disk is circumferentially spaced apart from the circumferential ends of the shroud surface, and the gap varies in radial width throughout the circumferential length of the shroud surface;
- and
- the portion where the shroud surface becomes narrow has an angle of not smaller than 90 degrees as measured with the axis of rotation as a center, and is so located as to include a line that connects the axis of rotation of the disk to the portion where the vibration is to be suppressed.
Dependencies are inferred from the claim text.