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US 6,333,833 B1Granted
Hard disk platter assembly with plastic hub for use in a removable cartridge
AssigneeNomai SA
InventorsJacques Bordes, Marc Frouin
Life of this patent
Estimating the term…
Abstract
A hard disk assembly comprises a hub made of injection molded liquid crystal plastic, to which is mounted a magnetic disk by a twist-lock screw top. The expensive step of machining the critical hub component is avoided because sufficient accuracies can be achieved with the liquid crystal plastic when injection molded.
Claims12
A removable hard disk cartridge to insert into a matching disk drive, comprising:
- a magnetic plate to magnetically clamp to a disk drive spindle;
- a hub secured to the magnetic plate to rotate about a central axis thereof, comprising injection-molded liquid crystal plastic material and having molding accuracies in the range of five to ten micrometers;
- a magnetic disk mounted to the hub and having a magnetic coating to record data with a read/write head in a matching disk drive;
- a screw top mated to the hub with twist-locks to secure the magnetic disk to the hub with axial forces;
- and
- a shell having a cover piece and a base piece defining an enclosure around the hub, disk and screw top.
3 more elements
A removable hard disk cartridge to insert into a matching disk drive, comprising:
- a magnetic plate to magnetically clamp to a disk drive spindle and having a plurality of sprocket holes, wherein said sprocket holes each include one flared-open beveled end;
- a hub secured to the magnetic plate to rotate about a central axis thereof, comprising injection-molded liquid crystal plastic material and having a molded-in lip and locking teeth and having molding accuracies in the range of five to ten micrometers;
- a magnetic disk mounted to the hub against said lip and having a magnetic coating to magnetically record data;
- a screw top with locking teeth matching said locking teeth of the hub to twist-lock secure the magnetic disk to the hub;
- a shell having a cover piece and a base piece defining an enclosure around the hub, disk and screw top;
- and
- a movably mounting door assembly relative to the shell enclosure.
4 more elements
Dependencies are inferred from the claim text.