Browse Prior Art Database

Flexible Disk Cartridges

IP.com Disclosure Number: IPCOM000050911D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Evans, DA: AUTHOR

Abstract

For portability, it is desirable to employ a flexible disk in a disk cartridge container for exchanging it between disk drives as well as having a plurality of individual flexible disks accessible by a single disk drive. For efficiency, it is desirable to have as thin a cartridge as possible yet maintain a stable "line" condition of the flexible disk with respect to the backing plate and with respect to a transducer (not shown) accessing the disk in a recording area. As the cover of the cartridge is positioned closer to the plane of rotation of the disk, vortexing occurs tending to make the disk rotate in an unstable manner. An optimal antivortexing arrangement is shown in the figure wherein a pair of symmetrically disposed tangent ribs extend toward the rotation axis from opposite walls of the cartridge.

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Flexible Disk Cartridges

For portability, it is desirable to employ a flexible disk in a disk cartridge container for exchanging it between disk drives as well as having a plurality of individual flexible disks accessible by a single disk drive. For efficiency, it is desirable to have as thin a cartridge as possible yet maintain a stable "line" condition of the flexible disk with respect to the backing plate and with respect to a transducer (not shown) accessing the disk in a recording area. As the cover of the cartridge is positioned closer to the plane of rotation of the disk, vortexing occurs tending to make the disk rotate in an unstable manner. An optimal antivortexing arrangement is shown in the figure wherein a pair of symmetrically disposed tangent ribs extend toward the rotation axis from opposite walls of the cartridge. One of the tangent ribs is immediately downstream from the recording area. This apparently acts as a "dam" for maintaining good pressure in the recording area and the resultant stabilized recording platform. Additional stability is provided by a plurality of radially inwardly extending corner ribs which extend from the cover a shorter distance than the tangent ribs. It is preferred to locate the tangent ribs a few millimeters above the record disk; the corner ribs are spaced further from the disk. It is not necessary that the tangent ribs overlap, as best seen in the elevation view.

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