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Self-centering-disk-having-an-eccentric-elliptical-shaped-center-locating-hole

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Self-centering disk having an eccentric elliptical-shaped center locating hole

Details

Inventors: Kauffmann, Elwood Ludwig;
Assignee: International Business Machines Corporation (Armonk, NY)
Primary Examiner: Tupper; Robert S.
Assistant Examiner:
Attorney, Agent or Firm: Pershon; James A.

A magnetic disk member for a memory disk file usable in a data processing system includes an eccentric multi-lobed triangular center locating hole to facilitate concentric mounting of the locating hole centerlines in a multiple disk pack memory. The disks are centered in a disk pack by placing onto a drive hub having ribs to match the lobes of the locating holes.

DETAILED DESCRIPTION I claim: 1.
A disk record member for self-centering around a drive hub in an assembly comprising: a flat substrate essentially circularly shaped; a multilobed center locating drive hole in said substrate; formed from eccentric arcuate bearing surfaces; and means for storing information on said substrate.
2.
A disk record member as defined in claim 1 wherein said center locating drive hole comprises three equal lobes formed from three equal arcuate bearing surfaces.
3.
A disk record member as defined in claim 1 wherein said substrate is made from aluminum or an aluminum alloy.
4.
A disk record member as defined in claim 1 wherein said means for storing information comprises a layer of a magnetizable iron oxide compound.
5.
A disk file for processing signals by transducing operation between a transducer and a rotating disk comprising: at least one disk each having a multilobed center locating hole including angularly spaced eccentric arcuate bearing surfaces and with each disk having information stored thereon in the form of impulses; a transducer means for sensing the impulses from said disks; a rotary drive hub assembly having a number of protrusions equal in number to the lobes of said disk for engaging said arcuate bearing surfaces of said center locating hole of each disk to drive said disks; drive means connected to said hub assembly for rotating said hub assembly and said disks; and means for loading said disks into intimate contact with said transducer means.
6.
A disk file as defined in claim 5 wherein said center locating hole of each disk comprises three equal lobes formed from three equal arcuate bearing surfaces.
7.
A disk file as defined in claim 5 wherein said disk comprises a flat substrate essentially circularly shaped and includes means for storing information on said substrate.
8.
A disk file as defined in claim 7 wherein said substrate is made from aluminum or an aluminum alloy.
9.
A disk file as defined in claim 7 wherein said means for storing information comprises a layer of a magnetizable iron oxide compound

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