Browse Prior Art Database

Coupling Range Extensions for Flexible Disk File

IP.com Disclosure Number: IPCOM000043306D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Evans, DA: AUTHOR [+3]

Abstract

A disk file employs a read/write head of the ring stabilized type which accesses a flexible disk through a slot in a backing plate over which the disk flies. By providing the plate with shallow depressions to either side of the access slot, the range of head penetration over which the head and disk are stably coupled is extended. As shown in Fig. 1, inner wall 10 of a disk cartridge is provided with a read/write head access slot 11 and a central hub drive aperture 12. The surface of the wall 10 within the peripheral extent 13 of the disk (not shown) is planar except that a shallow sharp edged depression 14 about 2 mm deep is provided surrounding the slot 11. This has been found to have the effect, as shown in Fig. 2, of increasing the range of head penetration over which the head and a disk are coupled, i.e.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Coupling Range Extensions for Flexible Disk File

A disk file employs a read/write head of the ring stabilized type which accesses a flexible disk through a slot in a backing plate over which the disk flies. By providing the plate with shallow depressions to either side of the access slot, the range of head penetration over which the head and disk are stably coupled is extended. As shown in Fig. 1, inner wall 10 of a disk cartridge is provided with a read/write head access slot 11 and a central hub drive aperture 12. The surface of the wall 10 within the peripheral extent 13 of the disk (not shown) is planar except that a shallow sharp edged depression 14 about 2 mm deep is provided surrounding the slot 11. This has been found to have the effect, as shown in Fig. 2, of increasing the range of head penetration over which the head and a disk are coupled, i.e., spaced apart by a stable small gap under the influence of aerodynamic forces. As compared with a plane backing plate, the range is extended generally at the lower end and at the upper end particularly at large radii where coupling is prone to break down. These results were obtained with a disk medium of 0.0015 inch thickness and a ring stabilized head of the type shown in U.S. Patent 4,003,091. For thicker disk media, a sloping depression of the form shown in Fig. 3 is more effective in extending the coupling range.

1

Page 2 of 2

2

[This page contains 4 pictures or other non-text objects]