Disk drive having electrostatic discharge path defined between disk assembly and base
View Patent ↗In a first aspect, a disk drive includes a base and a disk assembly, including at least one data storage disk, rotatably mounted on the base. The disk drive further includes structure for defining an electrostatic discharge gap between the base and the disk assembly. For example, one or more point electrodes may be provided on the disk assembly, to define the electrostatic discharge gap relative to one or more stationary electrodes mounted on the base. Damaging electrostatic discharges through the read/write head, or at a surface of the data storage disk, may be prevented by the present invention.
1. A disk drive, comprising:
a base;
a disk assembly rotatably mounted on the base and including at least one data storage disk; and
means for defining an electrostatic discharge gap between the base and the disk assembly.
2. The disk drive of claim 1 , wherein the electrostatic discharge gap is intermittently defined between the base and the disk assembly as the disk assembly rotates.
3. The disk drive of claim 2 , wherein the means for defining includes a first electrode mounted for rotation with the disk assembly and a second electrode fixedly mounted on the base.
4. The disk drive of claim 3 , wherein the disk assembly includes a spindle hub having a horizontally extending hub-flange, and the first electrode is mounted on the hub-flange.
5. The disk drive of claim 1 , wherein the means for defining includes a flexible beam having a first end fixedly mounted on the base and a second end on which a plate is mounted adjacent to the disk assembly, a point electrode being mounted on the plate.
6. The disk drive of claim 5 , wherein the disk assembly includes a spindle hub having a horizontally extending hub-flange, and the electrostatic discharge gap is defined between the point electrode and the hub-flange.
7. A disk drive, comprising:
a base;
at least one data storage disk rotatably mounted on the base;
at least one first electrode mounted for rotation with the at least one data storage disk; and
at least one second electrode fixedly mounted on the base;
wherein the at least one first electrode and the at least one second electrode intermittently define therebetween a discharge gap as the at least one data storage disk is rotated.
8. The disk drive of claim 7 , wherein each first electrode includes a cone-shaped member pointing outwardly and each second electrode includes a cone-shaped member pointing inwardly.
9. The disk drive of claim 7 , wherein the at least one data storage disk is mounted on a rotary spindle hub, the spindle hub including an outwardly extending hub-flange at a lower portion thereof, the at least one first electrode being mounted on the hub-flange.
10. The disk drive of claim 9 , wherein each first electrode includes a cone-shaped member pointing outwardly and each second electrode includes a cone-shaped member pointing inwardly.
11. The disk drive of claim 7 , wherein the at least one first electrode includes two first electrodes mounted for rotation with the at least one data storage disk.
12. The disk drive of claim 11 , wherein the at least one data storage disk is mounted on a rotary spindle hub, the rotary spindle hub including an outwardly extending hub-flange at a lower portion thereof, and the two first electrodes are mounted at diametrically opposed positions on the hub-flange.
13. The disk drive of claim 7 , wherein the at least one data storage disk includes two data storage disks, and the disk drive further comprises a spacer in contact with both data storage disks, the spacer having an electrically conductive coating thereon.
14. A disk drive, comprising:
a base;
a spindle hub rotatably mounted on the base and including an outwardly extending hub-flange;
at least one data storage disk mounted on the spindle hub for rotation therewith;
a flexible beam having a first end fixedly mounted to the base;
a plate mounted to a second end of the flexible beam and adjacent the hub-flange of the spindle hub; and
a point electrode mounted on the plate for defining an electrostatic discharge gap relative to the hub-flange.
15. The disk drive of claim 14 , wherein the plate is attracted to the hub-flange as an electrostatic charge builds up on the at least one data storage disk.
16. A method of operating a disk drive, comprising:
providing a disk assembly rotatably mounted on a base, and
defining an electrostatic discharge path across an air gap between the disk assembly and the base.
17. The method of claim 16 , wherein the defining step includes intermittently juxtaposing a first electrode on the disk assembly with a second electrode on the base.
18. The method of claim 16 , wherein the defining step includes attracting toward the disk assembly a plate mounted on the base.