Appeal No. 1997-1230
Application 08/274,807
appealed subject matter and reads as follows:
1. A magnetic hard disk platter assembly for use in a
removable hard disk cartridge, comprising:
a hub 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 for the recording of data with a read/write head in a
matching disk drive that mates with said magnetic hard disk
platter assembly; and
a screw top mated to the hub with twist-locks for
securing the magnetic disk to the hub.
A further appreciation of appellants’ invention is
derived from the following passages found in the
specification:
Another advantage of the present invention is
that a hard disk assembly is provided in which the
expensive step of machining the critical hub
component is avoided because acceptable finished
component tolerances can be achieved with liquid
crystal plastic when simply injection molded.
[Specification, page 2.]
* * *
The fit of the magnetic disk 14 and especially
the center opening 15 to the plastic hub 16 and its
lip 18 must be precise so that wobble and runout
when the disk 14 is rotated are controlled.
Conventional metal hubs include a machining step in
2
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