Browse Prior Art Database

Floppy Disk Drive With Foam Head Load Pad

IP.com Disclosure Number: IPCOM000041529D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Billman, JW: AUTHOR [+3]

Abstract

A uniform head-to-disk compliance pattern is insured by the use of a foam rubber head load pad. The figure shows a cutaway portion of a floppy disk 10 which is being transduced by magnetic read/write head 11. As shown by arrow 12, head 11 moves in incremental steps in order to transduce the various data tracks carried by disk 10. In the figure, head 11 is shown positioned to transduce the center track carried by the disk, and the disk's rotational movement is out of the figure. The flexible disk is pressed into the head by a spring-loaded arm 13, whose spring bias force 14 causes foam rubber pad 15 to engage the top side of disk 10. Pad 15 spans all tracks carried by the disk, and pad 15 does not move as the head is stepped to the various disk tracks.

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Floppy Disk Drive With Foam Head Load Pad

A uniform head-to-disk compliance pattern is insured by the use of a foam rubber head load pad. The figure shows a cutaway portion of a floppy disk 10 which is being transduced by magnetic read/write head 11. As shown by arrow 12, head 11 moves in incremental steps in order to transduce the various data tracks carried by disk 10. In the figure, head 11 is shown positioned to transduce the center track carried by the disk, and the disk's rotational movement is out of the figure. The flexible disk is pressed into the head by a spring-loaded arm 13, whose spring bias force 14 causes foam rubber pad 15 to engage the top side of disk 10. Pad 15 spans all tracks carried by the disk, and pad 15 does not move as the head is stepped to the various disk tracks. With this type of construction it is essential that pad 15 provide consistent head-to-disk compliance for each position of head 11. In order to provide this interface uniformity, pad 15 is made of a polyether/polyester urethane blend, the density of which is about 20 pounds per cubic foot, and the cell distribution of which is about 100 pores per linear inch.

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