Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
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.