Disk drive including a disk plate having a damping member
View Patent ↗A disk drive includes a disk drive base and a spindle motor including a spindle motor hub rotatably coupled to the disk drive base. The disk drive further includes a disk having a disk surface disposed about the spindle motor hub. The disk drive further includes a cover attached to the disk drive base with the spindle motor and the disk enclosed within the cover and the disk drive base. The disk drive further includes a disk plate. The disk plate includes a plate body coupled to the disk drive base between the disk and the cover. The plate body extends substantially along the disk surface. The disk plate further includes a damping member disposed upon the plate body. The damping member includes a stiffener layer and a damping layer formed between the stiffener layer and the plate body for mitigating vibration of the plate body.
1. A disk drive comprising:
a disk drive base;
a spindle motor including a spindle motor hub rotatably coupled to the disk drive base;
a disk disposed about the spindle motor hub, the disk including a disk surface;
a cover attached to the disk drive base with the spindle motor and the disk enclosed within the cover and the disk drive base; and
a disk plate including:
a plate body coupled to the disk drive base between the disk and the cover, the plate body extends substantially along the disk surface; and
a damping member disposed upon the plate body, the damping member including:
a stiffener layer; and
a damping layer formed between the stiffener layer and the plate body for mitigating vibration of the plate body.
2. The disk drive of claim 1 wherein the disk is a topmost disk, the disk surface is disposed towards the cover, the damping member is disposed adjacent the cover.
3. The disk drive of claim 1 wherein the plate body is formed of a metal material.
4. The disk drive of claim 1 wherein the stiffener layer is formed of a metal material.
5. The disk drive of claim 1 wherein the damping layer is formed of a viscoelastic material.
6. The disk drive of claim 1 wherein the plate body has a thickness of between 0.02 inches and 0.04 inches.
7. The disk drive of claim 1 wherein the stiffener layer has a thickness of between 0.02 inches and 0.025 inches.
8. The disk drive of claim 1 wherein the damping layer has a thickness of between 0.001 inches and 0.002 inches.
9. The disk drive of claim 1 wherein the plate body and the stiffener layer have a same thickness.
10. The disk drive of claim 1 wherein the plate body extends entirely along the disk surface.
11. The disk drive of claim 1 wherein the spindle motor includes a fixed spindle motor shaft, the spindle motor shaft is distally attached to the disk plate.
12. The disk drive of claim 1 wherein the disk plate includes a fastener, the fastener extends from the disk plate towards the spindle motor and is engaged with the spindle motor shaft.
13. The disk drive of claim 1 wherein the plate body includes a main portion and a raised portion, the raised portion is offset from the main portion in a direction away from the disk towards the cover.
14. The disk drive of claim 13 further includes a rotary actuator rotatably coupled to the disk drive base adjacent the disk, the raised portion is disposed adjacent the rotary actuator.
15. The disk drive of claim 13 further includes a disk clamp attached to the spindle motor hub between the spindle motor hub and the cover, the raised portion is disposed adjacent the disk clamp.
16. The disk drive of claim 1 further includes a rotary actuator rotatably coupled to the disk drive base adjacent the disk, the rotary actuator includes an actuator arm disposed adjacent the disk between the disk and the cover, the plate body includes a radial opening, the actuator arm is disposed within the radial opening.