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Browse Prior Art Database

Disk Hub

IP.com Disclosure Number: IPCOM000062127D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Maurer, WA: AUTHOR [+2]

Abstract

This disk hub is of the type useful with 3 1/2-inch diameter floppy magnetic recording disks. This hub is useful with the disk drive described in U.S. Patent 4,517,617, and is an improvement upon the disk hub which is described therein. The hub is constructed to maximize disk flatness and to reduce the disk's stiffness at the location of the disk's inner data tracks. Floppy magnetic recording disk 10 is about 3 1/2 inches in diameter. Flat metal hub 11 is die-cut from a flat piece of magnetically permeable metal. Hub 11 is of the same diameter as the disk hub described in U.S. Patent 4,517,617. A 0.6 inch diameter flat plastic spacer 12 spaces the larger diameter metal hub from the adjacent surface of disk 10. The disk's center opening 13 is about 0.4 inch in diameter.

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Disk Hub

This disk hub is of the type useful with 3 1/2-inch diameter floppy magnetic recording disks. This hub is useful with the disk drive described in U.S. Patent 4,517,617, and is an improvement upon the disk hub which is described therein. The hub is constructed to maximize disk flatness and to reduce the disk's stiffness at the location of the disk's inner data tracks. Floppy magnetic recording disk 10 is about 3 1/2 inches in diameter. Flat metal hub 11 is die-cut from a flat piece of magnetically permeable metal. Hub 11 is of the same diameter as the disk hub described in U.S. Patent 4,517,617. A 0.6 inch diameter flat plastic spacer 12 spaces the larger diameter metal hub from the adjacent surface of disk
10. The disk's center opening 13 is about 0.4 inch in diameter. This opening allows the three pins 14, which are carried by the hub, to pass through disk opening 13. A flat plastic retainer 15 is of the same diameter as spacer 12, and contains three holes 16 which receive the three pins 14. After retainer 15 is positioned with relation to these pins, the pins are ultrasonically upset, or heat stacked, to hold disk 10 tightly in a unitary assembly with hub 11. With this construction, the radial distance between the disk's inner data track and the disk's central mounting area is increased. Thus, the disk is flatter and more flexible at its inner track region, and better data transducing results.

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